/*!
 * Less - Leaner CSS v2.7.3
 * http://lesscss.org
 *
 * Copyright (c) 2009-2017, Alexis Sellier <self@cloudhead.net>
 * Licensed under the Apache-2.0 License.
 *
 */

/** * @license Apache-2.0
 */

(function(f) {
  if (typeof exports === "object" && typeof module !== "undefined") {
    module.exports = f();
  } else if (typeof define === "function" && define.amd) {
    define([], f);
  } else {
    var g;
    if (typeof window !== "undefined") {
      g = window;
    } else if (typeof global !== "undefined") {
      g = global;
    } else if (typeof self !== "undefined") {
      g = self;
    } else {
      g = this;
    }

    // Changes to original file so that it works in V8 enigine - start
    elem = {
      setAttribute: function() {
        return null;
      },
      appendChild: function(text) {
        return "<style>" + text + "</style>";
      }
    };
    document = {
      getElementsByTagName: function() {
        return [{}, {}];
      },
      createElement: function() {
        return elem;
      },
      createTextNode: function(text) {
        return text;
      },
      head: elem
    };
    window = {
      document: document,
      location: {}
    };
    // Changes to original file so that it works in V8 enigine - end
    g.less = f();
  }
})(function() {
  var define, module, exports;
  return (function e(t, n, r) {
    function s(o, u) {
      if (!n[o]) {
        var l = (n[o] = { exports: {} });

        t[o][0].call(
          l.exports,
          function(e) {
            var n = t[o][1][e];
            return s(n ? n : e);
          },
          l,
          l.exports,
          e,
          t,
          n,
          r
        );
      }
      return n[o].exports;
    }

    for (var o = 0; o < r.length; o++) {
      s(r[o]);
    }

    return s;
  })(
    {
      1: [
        function(require, module, exports) {
          var addDataAttr = require("./utils").addDataAttr,
            browser = require("./browser");

          module.exports = function(window, options) {
            // use options from the current script tag data attribues
            addDataAttr(options, browser.currentScript(window));

            if (options.isFileProtocol === undefined) {
              options.isFileProtocol = /^(file|(chrome|safari)(-extension)?|resource|qrc|app):/.test(
                window.location.protocol
              );
            }

            // Load styles asynchronously (default: false)
            //
            // This is set to `false` by default, so that the body
            // doesn't start loading before the stylesheets are parsed.
            // Setting this to `true` can result in flickering.
            //
            options.async = options.async || false;
            options.fileAsync = options.fileAsync || false;

            // Interval between watch polls
            options.poll =
              options.poll || (options.isFileProtocol ? 1000 : 1500);

            options.env =
              options.env ||
              (window.location.hostname == "127.0.0.1" ||
              window.location.hostname == "0.0.0.0" ||
              window.location.hostname == "localhost" ||
              (window.location.port && window.location.port.length > 0) ||
              options.isFileProtocol
                ? "development"
                : "production");

            var dumpLineNumbers = /!dumpLineNumbers:(comments|mediaquery|all)/.exec(
              window.location.hash
            );
            if (dumpLineNumbers) {
              options.dumpLineNumbers = dumpLineNumbers[1];
            }

            if (options.useFileCache === undefined) {
              options.useFileCache = true;
            }

            if (options.onReady === undefined) {
              options.onReady = true;
            }
          };
        },
        { "./browser": 3, "./utils": 10 }
      ],
      2: [
        function(require, module, exports) {
          /**
           * Kicks off less and compiles any stylesheets
           * used in the browser distributed version of less
           * to kick-start less using the browser api
           */
          /*global window, document */

          // shim Promise if required
          require("promise/polyfill.js");

          var options = window.less || {};
          require("./add-default-options")(window, options);

          var less = (module.exports = require("./index")(window, options));

          window.less = less;

          var css, head, style;

          // Always restore page visibility
          function resolveOrReject(data) {
            if (data.filename) {
              console.warn(data);
            }
            if (!options.async) {
              head.removeChild(style);
            }
          }

          if (options.onReady) {
            if (/!watch/.test(window.location.hash)) {
              less.watch();
            }
            // Simulate synchronous stylesheet loading by blocking page rendering
            if (!options.async) {
              css = "body { display: none !important }";
              head = document.head || document.getElementsByTagName("head")[0];
              style = document.createElement("style");
              style.type = "text/css";
              if (style.styleSheet) {
                style.styleSheet.cssText = css;
              } else {
                style.appendChild(document.createTextNode(css));
              }

              head.appendChild(style);
            }
            //less.registerStylesheetsImmediately();
            //less.pageLoadFinished = less.refresh(less.env === 'development').then(resolveOrReject, resolveOrReject);
          }
        },
        { "./add-default-options": 1, "./index": 8, "promise/polyfill.js": 97 }
      ],
      3: [
        function(require, module, exports) {
          var utils = require("./utils");
          module.exports = {
            createCSS: function(document, styles, sheet) {
              // Strip the query-string
              var href = sheet.href || "";

              // If there is no title set, use the filename, minus the extension
              var id = "less:" + (sheet.title || utils.extractId(href));

              // If this has already been inserted into the DOM, we may need to replace it
              var oldStyleNode = document.getElementById(id);
              var keepOldStyleNode = false;

              // Create a new stylesheet node for insertion or (if necessary) replacement
              var styleNode = document.createElement("style");
              styleNode.setAttribute("type", "text/css");
              if (sheet.media) {
                styleNode.setAttribute("media", sheet.media);
              }
              styleNode.id = id;

              if (!styleNode.styleSheet) {
                styleNode.appendChild(document.createTextNode(styles));

                // If new contents match contents of oldStyleNode, don't replace oldStyleNode
                keepOldStyleNode =
                  oldStyleNode !== null &&
                  oldStyleNode.childNodes.length > 0 &&
                  styleNode.childNodes.length > 0 &&
                  oldStyleNode.firstChild.nodeValue ===
                    styleNode.firstChild.nodeValue;
              }

              var head = document.getElementsByTagName("head")[0];

              // If there is no oldStyleNode, just append; otherwise, only append if we need
              // to replace oldStyleNode with an updated stylesheet
              if (oldStyleNode === null || keepOldStyleNode === false) {
                var nextEl = (sheet && sheet.nextSibling) || null;
                if (nextEl) {
                  nextEl.parentNode.insertBefore(styleNode, nextEl);
                } else {
                  head.appendChild(styleNode);
                }
              }
              if (oldStyleNode && keepOldStyleNode === false) {
                oldStyleNode.parentNode.removeChild(oldStyleNode);
              }

              // For IE.
              // This needs to happen *after* the style element is added to the DOM, otherwise IE 7 and 8 may crash.
              // See http://social.msdn.microsoft.com/Forums/en-US/7e081b65-878a-4c22-8e68-c10d39c2ed32/internet-explorer-crashes-appending-style-element-to-head
              if (styleNode.styleSheet) {
                try {
                  styleNode.styleSheet.cssText = styles;
                } catch (e) {
                  throw new Error("Couldn't reassign styleSheet.cssText.");
                }
              }
            },
            currentScript: function(window) {
              var document = window.document;
              return (
                document.currentScript ||
                (function() {
                  var scripts = document.getElementsByTagName("script");
                  return scripts[scripts.length - 1];
                })()
              );
            }
          };
        },
        { "./utils": 10 }
      ],
      4: [
        function(require, module, exports) {
          // Cache system is a bit outdated and could do with work

          module.exports = function(window, options, logger) {
            var cache = null;
            if (options.env !== "development") {
              try {
                cache =
                  typeof window.localStorage === "undefined"
                    ? null
                    : window.localStorage;
              } catch (_) {}
            }
            return {
              setCSS: function(path, lastModified, modifyVars, styles) {
                if (cache) {
                  logger.info("saving " + path + " to cache.");
                  try {
                    cache.setItem(path, styles);
                    cache.setItem(path + ":timestamp", lastModified);
                    if (modifyVars) {
                      cache.setItem(path + ":vars", JSON.stringify(modifyVars));
                    }
                  } catch (e) {
                    //TODO - could do with adding more robust error handling
                    logger.error(
                      'failed to save "' +
                        path +
                        '" to local storage for caching.'
                    );
                  }
                }
              },
              getCSS: function(path, webInfo, modifyVars) {
                var css = cache && cache.getItem(path),
                  timestamp = cache && cache.getItem(path + ":timestamp"),
                  vars = cache && cache.getItem(path + ":vars");

                modifyVars = modifyVars || {};

                if (
                  timestamp &&
                  webInfo.lastModified &&
                  new Date(webInfo.lastModified).valueOf() ===
                    new Date(timestamp).valueOf() &&
                  ((!modifyVars && !vars) ||
                    JSON.stringify(modifyVars) === vars)
                ) {
                  // Use local copy
                  return css;
                }
              }
            };
          };
        },
        {}
      ],
      5: [
        function(require, module, exports) {
          var utils = require("./utils"),
            browser = require("./browser");

          module.exports = function(window, less, options) {
            function errorHTML(e, rootHref) {
              var id = "less-error-message:" + utils.extractId(rootHref || "");
              var template =
                '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
              var elem = window.document.createElement("div"),
                timer,
                content,
                errors = [];
              var filename = e.filename || rootHref;
              var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];

              elem.id = id;
              elem.className = "less-error-message";

              content =
                "<h3>" +
                (e.type || "Syntax") +
                "Error: " +
                (e.message || "There is an error in your .less file") +
                "</h3>" +
                '<p>in <a href="' +
                filename +
                '">' +
                filenameNoPath +
                "</a> ";

              var errorline = function(e, i, classname) {
                if (e.extract[i] !== undefined) {
                  errors.push(
                    template
                      .replace(
                        /\{line\}/,
                        (parseInt(e.line, 10) || 0) + (i - 1)
                      )
                      .replace(/\{class\}/, classname)
                      .replace(/\{content\}/, e.extract[i])
                  );
                }
              };

              if (e.extract) {
                errorline(e, 0, "");
                errorline(e, 1, "line");
                errorline(e, 2, "");
                content +=
                  "on line " +
                  e.line +
                  ", column " +
                  (e.column + 1) +
                  ":</p>" +
                  "<ul>" +
                  errors.join("") +
                  "</ul>";
              }
              if (e.stack && (e.extract || options.logLevel >= 4)) {
                content +=
                  "<br/>Stack Trace</br />" +
                  e.stack
                    .split("\n")
                    .slice(1)
                    .join("<br/>");
              }
              elem.innerHTML = content;

              // CSS for error messages
              browser.createCSS(
                window.document,
                [
                  ".less-error-message ul, .less-error-message li {",
                  "list-style-type: none;",
                  "margin-right: 15px;",
                  "padding: 4px 0;",
                  "margin: 0;",
                  "}",
                  ".less-error-message label {",
                  "font-size: 12px;",
                  "margin-right: 15px;",
                  "padding: 4px 0;",
                  "color: #cc7777;",
                  "}",
                  ".less-error-message pre {",
                  "color: #dd6666;",
                  "padding: 4px 0;",
                  "margin: 0;",
                  "display: inline-block;",
                  "}",
                  ".less-error-message pre.line {",
                  "color: #ff0000;",
                  "}",
                  ".less-error-message h3 {",
                  "font-size: 20px;",
                  "font-weight: bold;",
                  "padding: 15px 0 5px 0;",
                  "margin: 0;",
                  "}",
                  ".less-error-message a {",
                  "color: #10a",
                  "}",
                  ".less-error-message .error {",
                  "color: red;",
                  "font-weight: bold;",
                  "padding-bottom: 2px;",
                  "border-bottom: 1px dashed red;",
                  "}"
                ].join("\n"),
                { title: "error-message" }
              );

              elem.style.cssText = [
                "font-family: Arial, sans-serif",
                "border: 1px solid #e00",
                "background-color: #eee",
                "border-radius: 5px",
                "-webkit-border-radius: 5px",
                "-moz-border-radius: 5px",
                "color: #e00",
                "padding: 15px",
                "margin-bottom: 15px"
              ].join(";");

              if (options.env === "development") {
                timer = setInterval(function() {
                  var document = window.document,
                    body = document.body;
                  if (body) {
                    if (document.getElementById(id)) {
                      body.replaceChild(elem, document.getElementById(id));
                    } else {
                      body.insertBefore(elem, body.firstChild);
                    }
                    clearInterval(timer);
                  }
                }, 10);
              }
            }

            function removeErrorHTML(path) {
              var node = window.document.getElementById(
                "less-error-message:" + utils.extractId(path)
              );
              if (node) {
                node.parentNode.removeChild(node);
              }
            }

            function removeErrorConsole(path) {
              //no action
            }

            function removeError(path) {
              if (
                !options.errorReporting ||
                options.errorReporting === "html"
              ) {
                removeErrorHTML(path);
              } else if (options.errorReporting === "console") {
                removeErrorConsole(path);
              } else if (typeof options.errorReporting === "function") {
                options.errorReporting("remove", path);
              }
            }

            function errorConsole(e, rootHref) {
              var template = "{line} {content}";
              var filename = e.filename || rootHref;
              var errors = [];
              var content =
                (e.type || "Syntax") +
                "Error: " +
                (e.message || "There is an error in your .less file") +
                " in " +
                filename +
                " ";

              var errorline = function(e, i, classname) {
                if (e.extract[i] !== undefined) {
                  errors.push(
                    template
                      .replace(
                        /\{line\}/,
                        (parseInt(e.line, 10) || 0) + (i - 1)
                      )
                      .replace(/\{class\}/, classname)
                      .replace(/\{content\}/, e.extract[i])
                  );
                }
              };

              if (e.extract) {
                errorline(e, 0, "");
                errorline(e, 1, "line");
                errorline(e, 2, "");
                content +=
                  "on line " +
                  e.line +
                  ", column " +
                  (e.column + 1) +
                  ":\n" +
                  errors.join("\n");
              }
              if (e.stack && (e.extract || options.logLevel >= 4)) {
                content += "\nStack Trace\n" + e.stack;
              }
              less.logger.error(content);
            }

            function error(e, rootHref) {
              if (
                !options.errorReporting ||
                options.errorReporting === "html"
              ) {
                errorHTML(e, rootHref);
              } else if (options.errorReporting === "console") {
                errorConsole(e, rootHref);
              } else if (typeof options.errorReporting === "function") {
                options.errorReporting("add", e, rootHref);
              }
            }

            return {
              add: error,
              remove: removeError
            };
          };
        },
        { "./browser": 3, "./utils": 10 }
      ],
      6: [
        function(require, module, exports) {
          /*global window, XMLHttpRequest */

          module.exports = function(options, logger) {
            var AbstractFileManager = require("../less/environment/abstract-file-manager.js");

            var fileCache = {};

            //TODOS - move log somewhere. pathDiff and doing something similar in node. use pathDiff in the other browser file for the initial load

            function getXMLHttpRequest() {
              if (
                window.XMLHttpRequest &&
                (window.location.protocol !== "file:" ||
                  !("ActiveXObject" in window))
              ) {
                return new XMLHttpRequest();
              } else {
                try {
                  /*global ActiveXObject */
                  return new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {
                  logger.error("browser doesn't support AJAX.");
                  return null;
                }
              }
            }

            var FileManager = function() {};

            FileManager.prototype = new AbstractFileManager();

            FileManager.prototype.alwaysMakePathsAbsolute = function alwaysMakePathsAbsolute() {
              return true;
            };
            FileManager.prototype.join = function join(basePath, laterPath) {
              if (!basePath) {
                return laterPath;
              }
              return this.extractUrlParts(laterPath, basePath).path;
            };
            FileManager.prototype.doXHR = function doXHR(
              url,
              type,
              callback,
              errback
            ) {
              var xhr = getXMLHttpRequest();
              var async = options.isFileProtocol ? options.fileAsync : true;

              if (typeof xhr.overrideMimeType === "function") {
                xhr.overrideMimeType("text/css");
              }
              logger.debug("XHR: Getting '" + url + "'");
              xhr.open("GET", url, async);
              xhr.setRequestHeader(
                "Accept",
                type || "text/x-less, text/css; q=0.9, */*; q=0.5"
              );
              xhr.send(null);

              function handleResponse(xhr, callback, errback) {
                if (xhr.status >= 200 && xhr.status < 300) {
                  callback(
                    xhr.responseText,
                    xhr.getResponseHeader("Last-Modified")
                  );
                } else if (typeof errback === "function") {
                  errback(xhr.status, url);
                }
              }

              if (options.isFileProtocol && !options.fileAsync) {
                if (
                  xhr.status === 0 ||
                  (xhr.status >= 200 && xhr.status < 300)
                ) {
                  callback(xhr.responseText);
                } else {
                  errback(xhr.status, url);
                }
              } else if (async) {
                xhr.onreadystatechange = function() {
                  if (xhr.readyState == 4) {
                    handleResponse(xhr, callback, errback);
                  }
                };
              } else {
                handleResponse(xhr, callback, errback);
              }
            };
            FileManager.prototype.supports = function(
              filename,
              currentDirectory,
              options,
              environment
            ) {
              return true;
            };

            FileManager.prototype.clearFileCache = function() {
              fileCache = {};
            };

            FileManager.prototype.loadFile = function loadFile(
              filename,
              currentDirectory,
              options,
              environment,
              callback
            ) {
              if (currentDirectory && !this.isPathAbsolute(filename)) {
                filename = currentDirectory + filename;
              }

              options = options || {};

              // sheet may be set to the stylesheet for the initial load or a collection of properties including
              // some context variables for imports
              var hrefParts = this.extractUrlParts(
                filename,
                window.location.href
              );
              var href = hrefParts.url;

              if (options.useFileCache && fileCache[href]) {
                try {
                  var lessText = fileCache[href];
                  callback(null, {
                    contents: lessText,
                    filename: href,
                    webInfo: { lastModified: new Date() }
                  });
                } catch (e) {
                  callback({
                    filename: href,
                    message:
                      "Error loading file " + href + " error was " + e.message
                  });
                }
                return;
              }

              this.doXHR(
                href,
                options.mime,
                function doXHRCallback(data, lastModified) {
                  // per file cache
                  fileCache[href] = data;

                  // Use remote copy (re-parse)
                  callback(null, {
                    contents: data,
                    filename: href,
                    webInfo: { lastModified: lastModified }
                  });
                },
                function doXHRError(status, url) {
                  callback({
                    type: "File",
                    message: "'" + url + "' wasn't found (" + status + ")",
                    href: href
                  });
                }
              );
            };

            return FileManager;
          };
        },
        { "../less/environment/abstract-file-manager.js": 15 }
      ],
      7: [
        function(require, module, exports) {
          module.exports = function() {
            debugger;
            var functionRegistry = require("./../less/functions/function-registry");

            function imageSize() {
              throw {
                type: "Runtime",
                message:
                  "Image size functions are not supported in browser version of less"
              };
            }

            var imageFunctions = {
              "image-size": function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
              },
              "image-width": function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
              },
              "image-height": function(filePathNode) {
                imageSize(this, filePathNode);
                return -1;
              }
            };

            functionRegistry.addMultiple(imageFunctions);
          };
        },
        { "./../less/functions/function-registry": 22 }
      ],
      8: [
        function(require, module, exports) {
          //
          // index.js
          // Should expose the additional browser functions on to the less object
          //
          var addDataAttr = require("./utils").addDataAttr,
            browser = require("./browser");

          module.exports = function(window, options) {
            var document = window.document;
            var less = require("../less")();

            //module.exports = less;
            less.options = options;
            var environment = less.environment,
              FileManager = require("./file-manager")(options, less.logger),
              fileManager = new FileManager();
            environment.addFileManager(fileManager);
            less.FileManager = FileManager;

            require("./log-listener")(less, options);
            var errors = require("./error-reporting")(window, less, options);
            var cache = (less.cache =
              options.cache ||
              require("./cache")(window, options, less.logger));
            require("./image-size")(less.environment);

            //Setup user functions
            if (options.functions) {
              less.functions.functionRegistry.addMultiple(options.functions);
            }

            var typePattern = /^text\/(x-)?less$/;

            function postProcessCSS(styles) {
              // deprecated, use a plugin for postprocesstasks
              if (
                options.postProcessor &&
                typeof options.postProcessor === "function"
              ) {
                styles = options.postProcessor.call(styles, styles) || styles;
              }
              return styles;
            }

            function clone(obj) {
              var cloned = {};
              for (var prop in obj) {
                if (obj.hasOwnProperty(prop)) {
                  cloned[prop] = obj[prop];
                }
              }
              return cloned;
            }

            // only really needed for phantom
            function bind(func, thisArg) {
              var curryArgs = Array.prototype.slice.call(arguments, 2);
              return function() {
                var args = curryArgs.concat(
                  Array.prototype.slice.call(arguments, 0)
                );
                return func.apply(thisArg, args);
              };
            }

            function loadStyles(modifyVars) {
              var styles = document.getElementsByTagName("style"),
                style;

              for (var i = 0; i < styles.length; i++) {
                style = styles[i];
                if (style.type.match(typePattern)) {
                  var instanceOptions = clone(options);
                  instanceOptions.modifyVars = modifyVars;
                  var lessText = style.innerHTML || "";
                  instanceOptions.filename = document.location.href.replace(
                    /#.*$/,
                    ""
                  );

                  /*jshint loopfunc:true */
                  // use closure to store current style
                  less.render(
                    lessText,
                    instanceOptions,
                    bind(
                      function(style, e, result) {
                        if (e) {
                          errors.add(e, "inline");
                        } else {
                          style.type = "text/css";
                          if (style.styleSheet) {
                            style.styleSheet.cssText = result.css;
                          } else {
                            style.innerHTML = result.css;
                          }
                        }
                      },
                      null,
                      style
                    )
                  );
                }
              }
            }

            function loadStyleSheet(
              sheet,
              callback,
              reload,
              remaining,
              modifyVars
            ) {
              var instanceOptions = clone(options);
              addDataAttr(instanceOptions, sheet);
              instanceOptions.mime = sheet.type;

              if (modifyVars) {
                instanceOptions.modifyVars = modifyVars;
              }

              function loadInitialFileCallback(loadedFile) {
                var data = loadedFile.contents,
                  path = loadedFile.filename,
                  webInfo = loadedFile.webInfo;

                var newFileInfo = {
                  currentDirectory: fileManager.getPath(path),
                  filename: path,
                  rootFilename: path,
                  relativeUrls: instanceOptions.relativeUrls
                };

                newFileInfo.entryPath = newFileInfo.currentDirectory;
                newFileInfo.rootpath =
                  instanceOptions.rootpath || newFileInfo.currentDirectory;

                if (webInfo) {
                  webInfo.remaining = remaining;

                  var css = cache.getCSS(
                    path,
                    webInfo,
                    instanceOptions.modifyVars
                  );
                  if (!reload && css) {
                    webInfo.local = true;
                    callback(null, css, data, sheet, webInfo, path);
                    return;
                  }
                }

                //TODO add tests around how this behaves when reloading
                errors.remove(path);

                instanceOptions.rootFileInfo = newFileInfo;
                less.render(data, instanceOptions, function(e, result) {
                  if (e) {
                    e.href = path;
                    callback(e);
                  } else {
                    result.css = postProcessCSS(result.css);
                    cache.setCSS(
                      sheet.href,
                      webInfo.lastModified,
                      instanceOptions.modifyVars,
                      result.css
                    );
                    callback(null, result.css, data, sheet, webInfo, path);
                  }
                });
              }

              fileManager.loadFile(
                sheet.href,
                null,
                instanceOptions,
                environment,
                function(e, loadedFile) {
                  if (e) {
                    callback(e);
                    return;
                  }
                  loadInitialFileCallback(loadedFile);
                }
              );
            }

            function loadStyleSheets(callback, reload, modifyVars) {
              for (var i = 0; i < less.sheets.length; i++) {
                loadStyleSheet(
                  less.sheets[i],
                  callback,
                  reload,
                  less.sheets.length - (i + 1),
                  modifyVars
                );
              }
            }

            function initRunningMode() {
              if (less.env === "development") {
                less.watchTimer = setInterval(function() {
                  if (less.watchMode) {
                    fileManager.clearFileCache();
                    loadStyleSheets(function(e, css, _, sheet, webInfo) {
                      if (e) {
                        errors.add(e, e.href || sheet.href);
                      } else if (css) {
                        browser.createCSS(window.document, css, sheet);
                      }
                    });
                  }
                }, options.poll);
              }
            }

            //
            // Watch mode
            //
            less.watch = function() {
              if (!less.watchMode) {
                less.env = "development";
                initRunningMode();
              }
              this.watchMode = true;
              return true;
            };

            less.unwatch = function() {
              clearInterval(less.watchTimer);
              this.watchMode = false;
              return false;
            };

            //
            // Synchronously get all <link> tags with the 'rel' attribute set to
            // "stylesheet/less".
            //
            less.registerStylesheetsImmediately = function() {
              var links = document.getElementsByTagName("link");
              less.sheets = [];

              for (var i = 0; i < links.length; i++) {
                if (
                  links[i].rel === "stylesheet/less" ||
                  (links[i].rel.match(/stylesheet/) &&
                    links[i].type.match(typePattern))
                ) {
                  less.sheets.push(links[i]);
                }
              }
            };

            //
            // Asynchronously get all <link> tags with the 'rel' attribute set to
            // "stylesheet/less", returning a Promise.
            //
            less.registerStylesheets = function() {
              return new Promise(function(resolve, reject) {
                less.registerStylesheetsImmediately();
                resolve();
              });
            };

            //
            // With this function, it's possible to alter variables and re-render
            // CSS without reloading less-files
            //
            less.modifyVars = function(record) {
              return less.refresh(true, record, false);
            };

            less.refresh = function(reload, modifyVars, clearFileCache) {
              if ((reload || clearFileCache) && clearFileCache !== false) {
                fileManager.clearFileCache();
              }
              return new Promise(function(resolve, reject) {
                var startTime, endTime, totalMilliseconds, remainingSheets;
                startTime = endTime = new Date();

                // Set counter for remaining unprocessed sheets
                remainingSheets = less.sheets.length;

                if (remainingSheets === 0) {
                  endTime = new Date();
                  totalMilliseconds = endTime - startTime;
                  less.logger.info(
                    "Less has finished and no sheets were loaded."
                  );
                  resolve({
                    startTime: startTime,
                    endTime: endTime,
                    totalMilliseconds: totalMilliseconds,
                    sheets: less.sheets.length
                  });
                } else {
                  // Relies on less.sheets array, callback seems to be guaranteed to be called for every element of the array
                  loadStyleSheets(
                    function(e, css, _, sheet, webInfo) {
                      if (e) {
                        errors.add(e, e.href || sheet.href);
                        reject(e);
                        return;
                      }
                      if (webInfo.local) {
                        less.logger.info(
                          "Loading " + sheet.href + " from cache."
                        );
                      } else {
                        less.logger.info(
                          "Rendered " + sheet.href + " successfully."
                        );
                      }
                      browser.createCSS(window.document, css, sheet);
                      less.logger.info(
                        "CSS for " +
                          sheet.href +
                          " generated in " +
                          (new Date() - endTime) +
                          "ms"
                      );

                      // Count completed sheet
                      remainingSheets--;

                      // Check if the last remaining sheet was processed and then call the promise
                      if (remainingSheets === 0) {
                        totalMilliseconds = new Date() - startTime;
                        less.logger.info(
                          "Less has finished. CSS generated in " +
                            totalMilliseconds +
                            "ms"
                        );
                        resolve({
                          startTime: startTime,
                          endTime: endTime,
                          totalMilliseconds: totalMilliseconds,
                          sheets: less.sheets.length
                        });
                      }
                      endTime = new Date();
                    },
                    reload,
                    modifyVars
                  );
                }

                loadStyles(modifyVars);
              });
            };

            less.refreshStyles = loadStyles;
            return less;
          };
        },
        {
          "../less": 31,
          "./browser": 3,
          "./cache": 4,
          "./error-reporting": 5,
          "./file-manager": 6,
          "./image-size": 7,
          "./log-listener": 9,
          "./utils": 10
        }
      ],
      9: [
        function(require, module, exports) {
          module.exports = function(less, options) {
            var logLevel_debug = 4,
              logLevel_info = 3,
              logLevel_warn = 2,
              logLevel_error = 1;

            // The amount of logging in the javascript console.
            // 3 - Debug, information and errors
            // 2 - Information and errors
            // 1 - Errors
            // 0 - None
            // Defaults to 2
            options.logLevel =
              typeof options.logLevel !== "undefined"
                ? options.logLevel
                : options.env === "development"
                ? logLevel_info
                : logLevel_error;

            if (!options.loggers) {
              options.loggers = [
                {
                  debug: function(msg) {
                    if (options.logLevel >= logLevel_debug) {
                      console.log(msg);
                    }
                  },
                  info: function(msg) {
                    if (options.logLevel >= logLevel_info) {
                      console.log(msg);
                    }
                  },
                  warn: function(msg) {
                    if (options.logLevel >= logLevel_warn) {
                      console.warn(msg);
                    }
                  },
                  error: function(msg) {
                    if (options.logLevel >= logLevel_error) {
                      console.error(msg);
                    }
                  }
                }
              ];
            }
            for (var i = 0; i < options.loggers.length; i++) {
              less.logger.addListener(options.loggers[i]);
            }
          };
        },
        {}
      ],
      10: [
        function(require, module, exports) {
          module.exports = {
            extractId: function(href) {
              return href
                .replace(/^[a-z-]+:\/+?[^\/]+/, "") // Remove protocol & domain
                .replace(/[\?\&]livereload=\w+/, "") // Remove LiveReload cachebuster
                .replace(/^\//, "") // Remove root /
                .replace(/\.[a-zA-Z]+$/, "") // Remove simple extension
                .replace(/[^\.\w-]+/g, "-") // Replace illegal characters
                .replace(/\./g, ":"); // Replace dots with colons(for valid id)
            },
            addDataAttr: function(options, tag) {
              for (var opt in tag.dataset) {
                if (tag.dataset.hasOwnProperty(opt)) {
                  if (
                    opt === "env" ||
                    opt === "dumpLineNumbers" ||
                    opt === "rootpath" ||
                    opt === "errorReporting"
                  ) {
                    options[opt] = tag.dataset[opt];
                  } else {
                    try {
                      options[opt] = JSON.parse(tag.dataset[opt]);
                    } catch (_) {}
                  }
                }
              }
            }
          };
        },
        {}
      ],
      11: [
        function(require, module, exports) {
          var contexts = {};
          module.exports = contexts;

          var copyFromOriginal = function copyFromOriginal(
            original,
            destination,
            propertiesToCopy
          ) {
            if (!original) {
              return;
            }

            for (var i = 0; i < propertiesToCopy.length; i++) {
              if (original.hasOwnProperty(propertiesToCopy[i])) {
                destination[propertiesToCopy[i]] =
                  original[propertiesToCopy[i]];
              }
            }
          };

          /*
 parse is used whilst parsing
 */
          var parseCopyProperties = [
            // options
            "paths", // option - unmodified - paths to search for imports on
            "relativeUrls", // option - whether to adjust URL's to be relative
            "rootpath", // option - rootpath to append to URL's
            "strictImports", // option -
            "insecure", // option - whether to allow imports from insecure ssl hosts
            "dumpLineNumbers", // option - whether to dump line numbers
            "compress", // option - whether to compress
            "syncImport", // option - whether to import synchronously
            "chunkInput", // option - whether to chunk input. more performant but causes parse issues.
            "mime", // browser only - mime type for sheet import
            "useFileCache", // browser only - whether to use the per file session cache
            // context
            "processImports", // option & context - whether to process imports. if false then imports will not be imported.
            // Used by the import manager to stop multiple import visitors being created.
            "pluginManager" // Used as the plugin manager for the session
          ];

          contexts.Parse = function(options) {
            copyFromOriginal(options, this, parseCopyProperties);

            if (typeof this.paths === "string") {
              this.paths = [this.paths];
            }
          };

          var evalCopyProperties = [
            "paths", // additional include paths
            "compress", // whether to compress
            "ieCompat", // whether to enforce IE compatibility (IE8 data-uri)
            "strictMath", // whether math has to be within parenthesis
            "strictUnits", // whether units need to evaluate correctly
            "sourceMap", // whether to output a source map
            "importMultiple", // whether we are currently importing multiple copies
            "urlArgs", // whether to add args into url tokens
            "javascriptEnabled", // option - whether JavaScript is enabled. if undefined, defaults to true
            "pluginManager", // Used as the plugin manager for the session
            "importantScope" // used to bubble up !important statements
          ];

          contexts.Eval = function(options, frames) {
            copyFromOriginal(options, this, evalCopyProperties);

            if (typeof this.paths === "string") {
              this.paths = [this.paths];
            }

            this.frames = frames || [];
            this.importantScope = this.importantScope || [];
          };

          contexts.Eval.prototype.inParenthesis = function() {
            if (!this.parensStack) {
              this.parensStack = [];
            }
            this.parensStack.push(true);
          };

          contexts.Eval.prototype.outOfParenthesis = function() {
            this.parensStack.pop();
          };

          contexts.Eval.prototype.isMathOn = function() {
            return this.strictMath
              ? this.parensStack && this.parensStack.length
              : true;
          };

          contexts.Eval.prototype.isPathRelative = function(path) {
            return !/^(?:[a-z-]+:|\/|#)/i.test(path);
          };

          contexts.Eval.prototype.normalizePath = function(path) {
            var segments = path.split("/").reverse(),
              segment;

            path = [];
            while (segments.length !== 0) {
              segment = segments.pop();
              switch (segment) {
                case ".":
                  break;
                case "..":
                  if (path.length === 0 || path[path.length - 1] === "..") {
                    path.push(segment);
                  } else {
                    path.pop();
                  }
                  break;
                default:
                  path.push(segment);
                  break;
              }
            }

            return path.join("/");
          };

          //todo - do the same for the toCSS ?
        },
        {}
      ],
      12: [
        function(require, module, exports) {
          module.exports = {
            aliceblue: "#f0f8ff",
            antiquewhite: "#faebd7",
            aqua: "#00ffff",
            aquamarine: "#7fffd4",
            azure: "#f0ffff",
            beige: "#f5f5dc",
            bisque: "#ffe4c4",
            black: "#000000",
            blanchedalmond: "#ffebcd",
            blue: "#0000ff",
            blueviolet: "#8a2be2",
            brown: "#a52a2a",
            burlywood: "#deb887",
            cadetblue: "#5f9ea0",
            chartreuse: "#7fff00",
            chocolate: "#d2691e",
            coral: "#ff7f50",
            cornflowerblue: "#6495ed",
            cornsilk: "#fff8dc",
            crimson: "#dc143c",
            cyan: "#00ffff",
            darkblue: "#00008b",
            darkcyan: "#008b8b",
            darkgoldenrod: "#b8860b",
            darkgray: "#a9a9a9",
            darkgrey: "#a9a9a9",
            darkgreen: "#006400",
            darkkhaki: "#bdb76b",
            darkmagenta: "#8b008b",
            darkolivegreen: "#556b2f",
            darkorange: "#ff8c00",
            darkorchid: "#9932cc",
            darkred: "#8b0000",
            darksalmon: "#e9967a",
            darkseagreen: "#8fbc8f",
            darkslateblue: "#483d8b",
            darkslategray: "#2f4f4f",
            darkslategrey: "#2f4f4f",
            darkturquoise: "#00ced1",
            darkviolet: "#9400d3",
            deeppink: "#ff1493",
            deepskyblue: "#00bfff",
            dimgray: "#696969",
            dimgrey: "#696969",
            dodgerblue: "#1e90ff",
            firebrick: "#b22222",
            floralwhite: "#fffaf0",
            forestgreen: "#228b22",
            fuchsia: "#ff00ff",
            gainsboro: "#dcdcdc",
            ghostwhite: "#f8f8ff",
            gold: "#ffd700",
            goldenrod: "#daa520",
            gray: "#808080",
            grey: "#808080",
            green: "#008000",
            greenyellow: "#adff2f",
            honeydew: "#f0fff0",
            hotpink: "#ff69b4",
            indianred: "#cd5c5c",
            indigo: "#4b0082",
            ivory: "#fffff0",
            khaki: "#f0e68c",
            lavender: "#e6e6fa",
            lavenderblush: "#fff0f5",
            lawngreen: "#7cfc00",
            lemonchiffon: "#fffacd",
            lightblue: "#add8e6",
            lightcoral: "#f08080",
            lightcyan: "#e0ffff",
            lightgoldenrodyellow: "#fafad2",
            lightgray: "#d3d3d3",
            lightgrey: "#d3d3d3",
            lightgreen: "#90ee90",
            lightpink: "#ffb6c1",
            lightsalmon: "#ffa07a",
            lightseagreen: "#20b2aa",
            lightskyblue: "#87cefa",
            lightslategray: "#778899",
            lightslategrey: "#778899",
            lightsteelblue: "#b0c4de",
            lightyellow: "#ffffe0",
            lime: "#00ff00",
            limegreen: "#32cd32",
            linen: "#faf0e6",
            magenta: "#ff00ff",
            maroon: "#800000",
            mediumaquamarine: "#66cdaa",
            mediumblue: "#0000cd",
            mediumorchid: "#ba55d3",
            mediumpurple: "#9370d8",
            mediumseagreen: "#3cb371",
            mediumslateblue: "#7b68ee",
            mediumspringgreen: "#00fa9a",
            mediumturquoise: "#48d1cc",
            mediumvioletred: "#c71585",
            midnightblue: "#191970",
            mintcream: "#f5fffa",
            mistyrose: "#ffe4e1",
            moccasin: "#ffe4b5",
            navajowhite: "#ffdead",
            navy: "#000080",
            oldlace: "#fdf5e6",
            olive: "#808000",
            olivedrab: "#6b8e23",
            orange: "#ffa500",
            orangered: "#ff4500",
            orchid: "#da70d6",
            palegoldenrod: "#eee8aa",
            palegreen: "#98fb98",
            paleturquoise: "#afeeee",
            palevioletred: "#d87093",
            papayawhip: "#ffefd5",
            peachpuff: "#ffdab9",
            peru: "#cd853f",
            pink: "#ffc0cb",
            plum: "#dda0dd",
            powderblue: "#b0e0e6",
            purple: "#800080",
            rebeccapurple: "#663399",
            red: "#ff0000",
            rosybrown: "#bc8f8f",
            royalblue: "#4169e1",
            saddlebrown: "#8b4513",
            salmon: "#fa8072",
            sandybrown: "#f4a460",
            seagreen: "#2e8b57",
            seashell: "#fff5ee",
            sienna: "#a0522d",
            silver: "#c0c0c0",
            skyblue: "#87ceeb",
            slateblue: "#6a5acd",
            slategray: "#708090",
            slategrey: "#708090",
            snow: "#fffafa",
            springgreen: "#00ff7f",
            steelblue: "#4682b4",
            tan: "#d2b48c",
            teal: "#008080",
            thistle: "#d8bfd8",
            tomato: "#ff6347",
            turquoise: "#40e0d0",
            violet: "#ee82ee",
            wheat: "#f5deb3",
            white: "#ffffff",
            whitesmoke: "#f5f5f5",
            yellow: "#ffff00",
            yellowgreen: "#9acd32"
          };
        },
        {}
      ],
      13: [
        function(require, module, exports) {
          module.exports = {
            colors: require("./colors"),
            unitConversions: require("./unit-conversions")
          };
        },
        { "./colors": 12, "./unit-conversions": 14 }
      ],
      14: [
        function(require, module, exports) {
          module.exports = {
            length: {
              m: 1,
              cm: 0.01,
              mm: 0.001,
              in: 0.0254,
              px: 0.0254 / 96,
              pt: 0.0254 / 72,
              pc: (0.0254 / 72) * 12
            },
            duration: {
              s: 1,
              ms: 0.001
            },
            angle: {
              rad: 1 / (2 * Math.PI),
              deg: 1 / 360,
              grad: 1 / 400,
              turn: 1
            }
          };
        },
        {}
      ],
      15: [
        function(require, module, exports) {
          var abstractFileManager = function() {};

          abstractFileManager.prototype.getPath = function(filename) {
            var j = filename.lastIndexOf("?");
            if (j > 0) {
              filename = filename.slice(0, j);
            }
            j = filename.lastIndexOf("/");
            if (j < 0) {
              j = filename.lastIndexOf("\\");
            }
            if (j < 0) {
              return "";
            }
            return filename.slice(0, j + 1);
          };

          abstractFileManager.prototype.tryAppendExtension = function(
            path,
            ext
          ) {
            return /(\.[a-z]*$)|([\?;].*)$/.test(path) ? path : path + ext;
          };

          abstractFileManager.prototype.tryAppendLessExtension = function(
            path
          ) {
            return this.tryAppendExtension(path, ".less");
          };

          abstractFileManager.prototype.supportsSync = function() {
            return false;
          };

          abstractFileManager.prototype.alwaysMakePathsAbsolute = function() {
            return false;
          };

          abstractFileManager.prototype.isPathAbsolute = function(filename) {
            return /^(?:[a-z-]+:|\/|\\|#)/i.test(filename);
          };

          abstractFileManager.prototype.join = function(basePath, laterPath) {
            if (!basePath) {
              return laterPath;
            }
            return basePath + laterPath;
          };
          abstractFileManager.prototype.pathDiff = function pathDiff(
            url,
            baseUrl
          ) {
            // diff between two paths to create a relative path

            var urlParts = this.extractUrlParts(url),
              baseUrlParts = this.extractUrlParts(baseUrl),
              i,
              max,
              urlDirectories,
              baseUrlDirectories,
              diff = "";
            if (urlParts.hostPart !== baseUrlParts.hostPart) {
              return "";
            }
            max = Math.max(
              baseUrlParts.directories.length,
              urlParts.directories.length
            );
            for (i = 0; i < max; i++) {
              if (baseUrlParts.directories[i] !== urlParts.directories[i]) {
                break;
              }
            }
            baseUrlDirectories = baseUrlParts.directories.slice(i);
            urlDirectories = urlParts.directories.slice(i);
            for (i = 0; i < baseUrlDirectories.length - 1; i++) {
              diff += "../";
            }
            for (i = 0; i < urlDirectories.length - 1; i++) {
              diff += urlDirectories[i] + "/";
            }
            return diff;
          };
          // helper function, not part of API
          abstractFileManager.prototype.extractUrlParts = function extractUrlParts(
            url,
            baseUrl
          ) {
            // urlParts[1] = protocol://hostname/ OR /
            // urlParts[2] = / if path relative to host base
            // urlParts[3] = directories
            // urlParts[4] = filename
            // urlParts[5] = parameters

            var urlPartsRegex = /^((?:[a-z-]+:)?\/{2}(?:[^\/\?#]*\/)|([\/\\]))?((?:[^\/\\\?#]*[\/\\])*)([^\/\\\?#]*)([#\?].*)?$/i,
              urlParts = url.match(urlPartsRegex),
              returner = {},
              directories = [],
              i,
              baseUrlParts;

            if (!urlParts) {
              throw new Error("Could not parse sheet href - '" + url + "'");
            }

            // Stylesheets in IE don't always return the full path
            if (baseUrl && (!urlParts[1] || urlParts[2])) {
              baseUrlParts = baseUrl.match(urlPartsRegex);
              if (!baseUrlParts) {
                throw new Error("Could not parse page url - '" + baseUrl + "'");
              }
              urlParts[1] = urlParts[1] || baseUrlParts[1] || "";
              if (!urlParts[2]) {
                urlParts[3] = baseUrlParts[3] + urlParts[3];
              }
            }

            if (urlParts[3]) {
              directories = urlParts[3].replace(/\\/g, "/").split("/");

              // extract out . before .. so .. doesn't absorb a non-directory
              for (i = 0; i < directories.length; i++) {
                if (directories[i] === ".") {
                  directories.splice(i, 1);
                  i -= 1;
                }
              }

              for (i = 0; i < directories.length; i++) {
                if (directories[i] === ".." && i > 0) {
                  directories.splice(i - 1, 2);
                  i -= 2;
                }
              }
            }

            returner.hostPart = urlParts[1];
            returner.directories = directories;
            returner.path = (urlParts[1] || "") + directories.join("/");
            returner.fileUrl = returner.path + (urlParts[4] || "");
            returner.url = returner.fileUrl + (urlParts[5] || "");
            return returner;
          };

          module.exports = abstractFileManager;
        },
        {}
      ],
      16: [
        function(require, module, exports) {
          var logger = require("../logger");
          var environment = function(externalEnvironment, fileManagers) {
            this.fileManagers = fileManagers || [];
            externalEnvironment = externalEnvironment || {};

            var optionalFunctions = [
                "encodeBase64",
                "mimeLookup",
                "charsetLookup",
                "getSourceMapGenerator"
              ],
              requiredFunctions = [],
              functions = requiredFunctions.concat(optionalFunctions);

            for (var i = 0; i < functions.length; i++) {
              var propName = functions[i],
                environmentFunc = externalEnvironment[propName];
              if (environmentFunc) {
                this[propName] = environmentFunc.bind(externalEnvironment);
              } else if (i < requiredFunctions.length) {
                this.warn(
                  "missing required function in environment - " + propName
                );
              }
            }
          };

          environment.prototype.getFileManager = function(
            filename,
            currentDirectory,
            options,
            environment,
            isSync
          ) {
            if (!filename) {
              logger.warn(
                "getFileManager called with no filename.. Please report this issue. continuing."
              );
            }
            if (currentDirectory == null) {
              logger.warn(
                "getFileManager called with null directory.. Please report this issue. continuing."
              );
            }

            var fileManagers = this.fileManagers;
            if (options.pluginManager) {
              fileManagers = []
                .concat(fileManagers)
                .concat(options.pluginManager.getFileManagers());
            }
            for (var i = fileManagers.length - 1; i >= 0; i--) {
              var fileManager = fileManagers[i];
              if (
                fileManager[isSync ? "supportsSync" : "supports"](
                  filename,
                  currentDirectory,
                  options,
                  environment
                )
              ) {
                return fileManager;
              }
            }
            return null;
          };

          environment.prototype.addFileManager = function(fileManager) {
            this.fileManagers.push(fileManager);
          };

          environment.prototype.clearFileManagers = function() {
            this.fileManagers = [];
          };

          module.exports = environment;
        },
        { "../logger": 33 }
      ],
      17: [
        function(require, module, exports) {
          var Color = require("../tree/color"),
            functionRegistry = require("./function-registry");

          // Color Blending
          // ref: http://www.w3.org/TR/compositing-1

          function colorBlend(mode, color1, color2) {
            var ab = color1.alpha,
              cb, // backdrop
              as = color2.alpha,
              cs, // source
              ar,
              cr,
              r = []; // result

            ar = as + ab * (1 - as);
            for (var i = 0; i < 3; i++) {
              cb = color1.rgb[i] / 255;
              cs = color2.rgb[i] / 255;
              cr = mode(cb, cs);
              if (ar) {
                cr = (as * cs + ab * (cb - as * (cb + cs - cr))) / ar;
              }
              r[i] = cr * 255;
            }

            return new Color(r, ar);
          }

          var colorBlendModeFunctions = {
            multiply: function(cb, cs) {
              return cb * cs;
            },
            screen: function(cb, cs) {
              return cb + cs - cb * cs;
            },
            overlay: function(cb, cs) {
              cb *= 2;
              return cb <= 1
                ? colorBlendModeFunctions.multiply(cb, cs)
                : colorBlendModeFunctions.screen(cb - 1, cs);
            },
            softlight: function(cb, cs) {
              var d = 1,
                e = cb;
              if (cs > 0.5) {
                e = 1;
                d = cb > 0.25 ? Math.sqrt(cb) : ((16 * cb - 12) * cb + 4) * cb;
              }
              return cb - (1 - 2 * cs) * e * (d - cb);
            },
            hardlight: function(cb, cs) {
              return colorBlendModeFunctions.overlay(cs, cb);
            },
            difference: function(cb, cs) {
              return Math.abs(cb - cs);
            },
            exclusion: function(cb, cs) {
              return cb + cs - 2 * cb * cs;
            },

            // non-w3c functions:
            average: function(cb, cs) {
              return (cb + cs) / 2;
            },
            negation: function(cb, cs) {
              return 1 - Math.abs(cb + cs - 1);
            }
          };

          for (var f in colorBlendModeFunctions) {
            if (colorBlendModeFunctions.hasOwnProperty(f)) {
              colorBlend[f] = colorBlend.bind(null, colorBlendModeFunctions[f]);
            }
          }

          functionRegistry.addMultiple(colorBlend);
        },
        { "../tree/color": 50, "./function-registry": 22 }
      ],
      18: [
        function(require, module, exports) {
          var Dimension = require("../tree/dimension"),
            Color = require("../tree/color"),
            Quoted = require("../tree/quoted"),
            Anonymous = require("../tree/anonymous"),
            functionRegistry = require("./function-registry"),
            colorFunctions;

          function clamp(val) {
            return Math.min(1, Math.max(0, val));
          }

          function hsla(color) {
            return colorFunctions.hsla(color.h, color.s, color.l, color.a);
          }

          function number(n) {
            if (n instanceof Dimension) {
              return parseFloat(n.unit.is("%") ? n.value / 100 : n.value);
            } else if (typeof n === "number") {
              return n;
            } else {
              throw {
                type: "Argument",
                message: "color functions take numbers as parameters"
              };
            }
          }

          function scaled(n, size) {
            if (n instanceof Dimension && n.unit.is("%")) {
              return parseFloat((n.value * size) / 100);
            } else {
              return number(n);
            }
          }

          colorFunctions = {
            rgb: function(r, g, b) {
              return colorFunctions.rgba(r, g, b, 1.0);
            },
            rgba: function(r, g, b, a) {
              var rgb = [r, g, b].map(function(c) {
                return scaled(c, 255);
              });
              a = number(a);
              return new Color(rgb, a);
            },
            hsl: function(h, s, l) {
              return colorFunctions.hsla(h, s, l, 1.0);
            },
            hsla: function(h, s, l, a) {
              var m1, m2;

              function hue(h) {
                h = h < 0 ? h + 1 : h > 1 ? h - 1 : h;
                if (h * 6 < 1) {
                  return m1 + (m2 - m1) * h * 6;
                } else if (h * 2 < 1) {
                  return m2;
                } else if (h * 3 < 2) {
                  return m1 + (m2 - m1) * (2 / 3 - h) * 6;
                } else {
                  return m1;
                }
              }

              h = (number(h) % 360) / 360;
              s = clamp(number(s));
              l = clamp(number(l));
              a = clamp(number(a));

              m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
              m1 = l * 2 - m2;

              return colorFunctions.rgba(
                hue(h + 1 / 3) * 255,
                hue(h) * 255,
                hue(h - 1 / 3) * 255,
                a
              );
            },

            hsv: function(h, s, v) {
              return colorFunctions.hsva(h, s, v, 1.0);
            },

            hsva: function(h, s, v, a) {
              h = ((number(h) % 360) / 360) * 360;
              s = number(s);
              v = number(v);
              a = number(a);

              var i, f;
              i = Math.floor((h / 60) % 6);
              f = h / 60 - i;

              var vs = [v, v * (1 - s), v * (1 - f * s), v * (1 - (1 - f) * s)];
              var perm = [
                [0, 3, 1],
                [2, 0, 1],
                [1, 0, 3],
                [1, 2, 0],
                [3, 1, 0],
                [0, 1, 2]
              ];

              return colorFunctions.rgba(
                vs[perm[i][0]] * 255,
                vs[perm[i][1]] * 255,
                vs[perm[i][2]] * 255,
                a
              );
            },

            hue: function(color) {
              return new Dimension(color.toHSL().h);
            },
            saturation: function(color) {
              return new Dimension(color.toHSL().s * 100, "%");
            },
            lightness: function(color) {
              return new Dimension(color.toHSL().l * 100, "%");
            },
            hsvhue: function(color) {
              return new Dimension(color.toHSV().h);
            },
            hsvsaturation: function(color) {
              return new Dimension(color.toHSV().s * 100, "%");
            },
            hsvvalue: function(color) {
              return new Dimension(color.toHSV().v * 100, "%");
            },
            red: function(color) {
              return new Dimension(color.rgb[0]);
            },
            green: function(color) {
              return new Dimension(color.rgb[1]);
            },
            blue: function(color) {
              return new Dimension(color.rgb[2]);
            },
            alpha: function(color) {
              return new Dimension(color.toHSL().a);
            },
            luma: function(color) {
              return new Dimension(color.luma() * color.alpha * 100, "%");
            },
            luminance: function(color) {
              var luminance =
                (0.2126 * color.rgb[0]) / 255 +
                (0.7152 * color.rgb[1]) / 255 +
                (0.0722 * color.rgb[2]) / 255;

              return new Dimension(luminance * color.alpha * 100, "%");
            },
            saturate: function(color, amount, method) {
              // filter: saturate(3.2);
              // should be kept as is, so check for color
              if (!color.rgb) {
                return null;
              }
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.s += (hsl.s * amount.value) / 100;
              } else {
                hsl.s += amount.value / 100;
              }
              hsl.s = clamp(hsl.s);
              return hsla(hsl);
            },
            desaturate: function(color, amount, method) {
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.s -= (hsl.s * amount.value) / 100;
              } else {
                hsl.s -= amount.value / 100;
              }
              hsl.s = clamp(hsl.s);
              return hsla(hsl);
            },
            lighten: function(color, amount, method) {
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.l += (hsl.l * amount.value) / 100;
              } else {
                hsl.l += amount.value / 100;
              }
              hsl.l = clamp(hsl.l);
              return hsla(hsl);
            },
            darken: function(color, amount, method) {
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.l -= (hsl.l * amount.value) / 100;
              } else {
                hsl.l -= amount.value / 100;
              }
              hsl.l = clamp(hsl.l);
              return hsla(hsl);
            },
            fadein: function(color, amount, method) {
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.a += (hsl.a * amount.value) / 100;
              } else {
                hsl.a += amount.value / 100;
              }
              hsl.a = clamp(hsl.a);
              return hsla(hsl);
            },
            fadeout: function(color, amount, method) {
              var hsl = color.toHSL();

              if (
                typeof method !== "undefined" &&
                method.value === "relative"
              ) {
                hsl.a -= (hsl.a * amount.value) / 100;
              } else {
                hsl.a -= amount.value / 100;
              }
              hsl.a = clamp(hsl.a);
              return hsla(hsl);
            },
            fade: function(color, amount) {
              var hsl = color.toHSL();

              hsl.a = amount.value / 100;
              hsl.a = clamp(hsl.a);
              return hsla(hsl);
            },
            spin: function(color, amount) {
              var hsl = color.toHSL();
              var hue = (hsl.h + amount.value) % 360;

              hsl.h = hue < 0 ? 360 + hue : hue;

              return hsla(hsl);
            },
            //
            // Copyright (c) 2006-2009 Hampton Catlin, Natalie Weizenbaum, and Chris Eppstein
            // http://sass-lang.com
            //
            mix: function(color1, color2, weight) {
              if (!color1.toHSL || !color2.toHSL) {
                console.log(color2.type);
                console.dir(color2);
              }
              if (!weight) {
                weight = new Dimension(50);
              }
              var p = weight.value / 100.0;
              var w = p * 2 - 1;
              var a = color1.toHSL().a - color2.toHSL().a;

              var w1 = ((w * a == -1 ? w : (w + a) / (1 + w * a)) + 1) / 2.0;
              var w2 = 1 - w1;

              var rgb = [
                color1.rgb[0] * w1 + color2.rgb[0] * w2,
                color1.rgb[1] * w1 + color2.rgb[1] * w2,
                color1.rgb[2] * w1 + color2.rgb[2] * w2
              ];

              var alpha = color1.alpha * p + color2.alpha * (1 - p);

              return new Color(rgb, alpha);
            },
            greyscale: function(color) {
              return colorFunctions.desaturate(color, new Dimension(100));
            },
            contrast: function(color, dark, light, threshold) {
              // filter: contrast(3.2);
              // should be kept as is, so check for color
              if (!color.rgb) {
                return null;
              }
              if (typeof light === "undefined") {
                light = colorFunctions.rgba(255, 255, 255, 1.0);
              }
              if (typeof dark === "undefined") {
                dark = colorFunctions.rgba(0, 0, 0, 1.0);
              }
              //Figure out which is actually light and dark!
              if (dark.luma() > light.luma()) {
                var t = light;
                light = dark;
                dark = t;
              }
              if (typeof threshold === "undefined") {
                threshold = 0.43;
              } else {
                threshold = number(threshold);
              }
              if (color.luma() < threshold) {
                return light;
              } else {
                return dark;
              }
            },
            argb: function(color) {
              return new Anonymous(color.toARGB());
            },
            color: function(c) {
              if (
                c instanceof Quoted &&
                /^#([a-f0-9]{6}|[a-f0-9]{3})$/i.test(c.value)
              ) {
                return new Color(c.value.slice(1));
              }
              if (c instanceof Color || (c = Color.fromKeyword(c.value))) {
                c.value = undefined;
                return c;
              }
              throw {
                type: "Argument",
                message:
                  "argument must be a color keyword or 3/6 digit hex e.g. #FFF"
              };
            },
            tint: function(color, amount) {
              return colorFunctions.mix(
                colorFunctions.rgb(255, 255, 255),
                color,
                amount
              );
            },
            shade: function(color, amount) {
              return colorFunctions.mix(
                colorFunctions.rgb(0, 0, 0),
                color,
                amount
              );
            }
          };
          functionRegistry.addMultiple(colorFunctions);
        },
        {
          "../tree/anonymous": 46,
          "../tree/color": 50,
          "../tree/dimension": 56,
          "../tree/quoted": 73,
          "./function-registry": 22
        }
      ],
      19: [
        function(require, module, exports) {
          module.exports = function(environment) {
            var Quoted = require("../tree/quoted"),
              URL = require("../tree/url"),
              functionRegistry = require("./function-registry"),
              fallback = function(functionThis, node) {
                return new URL(
                  node,
                  functionThis.index,
                  functionThis.currentFileInfo
                ).eval(functionThis.context);
              },
              logger = require("../logger");

            functionRegistry.add("data-uri", function(
              mimetypeNode,
              filePathNode
            ) {
              if (!filePathNode) {
                filePathNode = mimetypeNode;
                mimetypeNode = null;
              }

              var mimetype = mimetypeNode && mimetypeNode.value;
              var filePath = filePathNode.value;
              var currentFileInfo = this.currentFileInfo;
              var currentDirectory = currentFileInfo.relativeUrls
                ? currentFileInfo.currentDirectory
                : currentFileInfo.entryPath;

              var fragmentStart = filePath.indexOf("#");
              var fragment = "";
              if (fragmentStart !== -1) {
                fragment = filePath.slice(fragmentStart);
                filePath = filePath.slice(0, fragmentStart);
              }

              var fileManager = environment.getFileManager(
                filePath,
                currentDirectory,
                this.context,
                environment,
                true
              );

              if (!fileManager) {
                return fallback(this, filePathNode);
              }

              var useBase64 = false;

              // detect the mimetype if not given
              if (!mimetypeNode) {
                mimetype = environment.mimeLookup(filePath);

                if (mimetype === "image/svg+xml") {
                  useBase64 = false;
                } else {
                  // use base 64 unless it's an ASCII or UTF-8 format
                  var charset = environment.charsetLookup(mimetype);
                  useBase64 = ["US-ASCII", "UTF-8"].indexOf(charset) < 0;
                }
                if (useBase64) {
                  mimetype += ";base64";
                }
              } else {
                useBase64 = /;base64$/.test(mimetype);
              }

              var fileSync = fileManager.loadFileSync(
                filePath,
                currentDirectory,
                this.context,
                environment
              );
              if (!fileSync.contents) {
                logger.warn(
                  "Skipped data-uri embedding of " +
                    filePath +
                    " because file not found"
                );
                return fallback(this, filePathNode || mimetypeNode);
              }
              var buf = fileSync.contents;
              if (useBase64 && !environment.encodeBase64) {
                return fallback(this, filePathNode);
              }

              buf = useBase64
                ? environment.encodeBase64(buf)
                : encodeURIComponent(buf);

              var uri = "data:" + mimetype + "," + buf + fragment;

              // IE8 cannot handle a data-uri larger than 32,768 characters. If this is exceeded
              // and the --ieCompat flag is enabled, return a normal url() instead.
              var DATA_URI_MAX = 32768;
              if (uri.length >= DATA_URI_MAX) {
                if (this.context.ieCompat !== false) {
                  logger.warn(
                    "Skipped data-uri embedding of " +
                      filePath +
                      " because its size (" +
                      uri.length +
                      " characters) exceeds IE8-safe " +
                      DATA_URI_MAX +
                      " characters!"
                  );

                  return fallback(this, filePathNode || mimetypeNode);
                }
              }

              return new URL(
                new Quoted(
                  '"' + uri + '"',
                  uri,
                  false,
                  this.index,
                  this.currentFileInfo
                ),
                this.index,
                this.currentFileInfo
              );
            });
          };
        },
        {
          "../logger": 33,
          "../tree/quoted": 73,
          "../tree/url": 80,
          "./function-registry": 22
        }
      ],
      20: [
        function(require, module, exports) {
          var Keyword = require("../tree/keyword"),
            functionRegistry = require("./function-registry");

          var defaultFunc = {
            eval: function() {
              var v = this.value_,
                e = this.error_;
              if (e) {
                throw e;
              }
              if (v != null) {
                return v ? Keyword.True : Keyword.False;
              }
            },
            value: function(v) {
              this.value_ = v;
            },
            error: function(e) {
              this.error_ = e;
            },
            reset: function() {
              this.value_ = this.error_ = null;
            }
          };

          functionRegistry.add("default", defaultFunc.eval.bind(defaultFunc));

          module.exports = defaultFunc;
        },
        { "../tree/keyword": 65, "./function-registry": 22 }
      ],
      21: [
        function(require, module, exports) {
          var Expression = require("../tree/expression");

          var functionCaller = function(name, context, index, currentFileInfo) {
            this.name = name.toLowerCase();
            this.index = index;
            this.context = context;
            this.currentFileInfo = currentFileInfo;

            this.func = context.frames[0].functionRegistry.get(this.name);
          };
          functionCaller.prototype.isValid = function() {
            return Boolean(this.func);
          };
          functionCaller.prototype.call = function(args) {
            // This code is terrible and should be replaced as per this issue...
            // https://github.com/less/less.js/issues/2477
            if (Array.isArray(args)) {
              args = args
                .filter(function(item) {
                  if (item.type === "Comment") {
                    return false;
                  }
                  return true;
                })
                .map(function(item) {
                  if (item.type === "Expression") {
                    var subNodes = item.value.filter(function(item) {
                      if (item.type === "Comment") {
                        return false;
                      }
                      return true;
                    });
                    if (subNodes.length === 1) {
                      return subNodes[0];
                    } else {
                      return new Expression(subNodes);
                    }
                  }
                  return item;
                });
            }

            return this.func.apply(this, args);
          };

          module.exports = functionCaller;
        },
        { "../tree/expression": 59 }
      ],
      22: [
        function(require, module, exports) {
          function makeRegistry(base) {
            return {
              _data: {},
              add: function(name, func) {
                // precautionary case conversion, as later querying of
                // the registry by function-caller uses lower case as well.
                name = name.toLowerCase();

                if (this._data.hasOwnProperty(name)) {
                  //TODO warn
                }
                this._data[name] = func;
              },
              addMultiple: function(functions) {
                Object.keys(functions).forEach(
                  function(name) {
                    this.add(name, functions[name]);
                  }.bind(this)
                );
              },
              get: function(name) {
                return this._data[name] || (base && base.get(name));
              },
              inherit: function() {
                return makeRegistry(this);
              }
            };
          }

          module.exports = makeRegistry(null);
        },
        {}
      ],
      23: [
        function(require, module, exports) {
          module.exports = function(environment) {
            var functions = {
              functionRegistry: require("./function-registry"),
              functionCaller: require("./function-caller")
            };

            //register functions
            require("./default");
            require("./color");
            require("./color-blending");
            require("./data-uri")(environment);
            require("./math");
            require("./number");
            require("./string");
            require("./svg")(environment);
            require("./types");

            return functions;
          };
        },
        {
          "./color": 18,
          "./color-blending": 17,
          "./data-uri": 19,
          "./default": 20,
          "./function-caller": 21,
          "./function-registry": 22,
          "./math": 25,
          "./number": 26,
          "./string": 27,
          "./svg": 28,
          "./types": 29
        }
      ],
      24: [
        function(require, module, exports) {
          var Dimension = require("../tree/dimension");

          var MathHelper = function() {};
          MathHelper._math = function(fn, unit, n) {
            if (!(n instanceof Dimension)) {
              throw { type: "Argument", message: "argument must be a number" };
            }
            if (unit == null) {
              unit = n.unit;
            } else {
              n = n.unify();
            }
            return new Dimension(fn(parseFloat(n.value)), unit);
          };
          module.exports = MathHelper;
        },
        { "../tree/dimension": 56 }
      ],
      25: [
        function(require, module, exports) {
          var functionRegistry = require("./function-registry"),
            mathHelper = require("./math-helper.js");

          var mathFunctions = {
            // name,  unit
            ceil: null,
            floor: null,
            sqrt: null,
            abs: null,
            tan: "",
            sin: "",
            cos: "",
            atan: "rad",
            asin: "rad",
            acos: "rad"
          };

          for (var f in mathFunctions) {
            if (mathFunctions.hasOwnProperty(f)) {
              mathFunctions[f] = mathHelper._math.bind(
                null,
                Math[f],
                mathFunctions[f]
              );
            }
          }

          mathFunctions.round = function(n, f) {
            var fraction = typeof f === "undefined" ? 0 : f.value;
            return mathHelper._math(
              function(num) {
                return num.toFixed(fraction);
              },
              null,
              n
            );
          };

          functionRegistry.addMultiple(mathFunctions);
        },
        { "./function-registry": 22, "./math-helper.js": 24 }
      ],
      26: [
        function(require, module, exports) {
          var Dimension = require("../tree/dimension"),
            Anonymous = require("../tree/anonymous"),
            functionRegistry = require("./function-registry"),
            mathHelper = require("./math-helper.js");

          var minMax = function(isMin, args) {
            args = Array.prototype.slice.call(args);
            switch (args.length) {
              case 0:
                throw {
                  type: "Argument",
                  message: "one or more arguments required"
                };
            }
            var i,
              j,
              current,
              currentUnified,
              referenceUnified,
              unit,
              unitStatic,
              unitClone,
              order = [], // elems only contains original argument values.
              values = {}; // key is the unit.toString() for unified Dimension values,
            // value is the index into the order array.
            for (i = 0; i < args.length; i++) {
              current = args[i];
              if (!(current instanceof Dimension)) {
                if (Array.isArray(args[i].value)) {
                  Array.prototype.push.apply(
                    args,
                    Array.prototype.slice.call(args[i].value)
                  );
                }
                continue;
              }
              currentUnified =
                current.unit.toString() === "" && unitClone !== undefined
                  ? new Dimension(current.value, unitClone).unify()
                  : current.unify();
              unit =
                currentUnified.unit.toString() === "" &&
                unitStatic !== undefined
                  ? unitStatic
                  : currentUnified.unit.toString();
              unitStatic =
                (unit !== "" && unitStatic === undefined) ||
                (unit !== "" && order[0].unify().unit.toString() === "")
                  ? unit
                  : unitStatic;
              unitClone =
                unit !== "" && unitClone === undefined
                  ? current.unit.toString()
                  : unitClone;
              j =
                values[""] !== undefined && unit !== "" && unit === unitStatic
                  ? values[""]
                  : values[unit];
              if (j === undefined) {
                if (unitStatic !== undefined && unit !== unitStatic) {
                  throw { type: "Argument", message: "incompatible types" };
                }
                values[unit] = order.length;
                order.push(current);
                continue;
              }
              referenceUnified =
                order[j].unit.toString() === "" && unitClone !== undefined
                  ? new Dimension(order[j].value, unitClone).unify()
                  : order[j].unify();
              if (
                (isMin && currentUnified.value < referenceUnified.value) ||
                (!isMin && currentUnified.value > referenceUnified.value)
              ) {
                order[j] = current;
              }
            }
            if (order.length == 1) {
              return order[0];
            }
            args = order
              .map(function(a) {
                return a.toCSS(this.context);
              })
              .join(this.context.compress ? "," : ", ");
            return new Anonymous((isMin ? "min" : "max") + "(" + args + ")");
          };
          functionRegistry.addMultiple({
            min: function() {
              return minMax(true, arguments);
            },
            max: function() {
              return minMax(false, arguments);
            },
            convert: function(val, unit) {
              return val.convertTo(unit.value);
            },
            pi: function() {
              return new Dimension(Math.PI);
            },
            mod: function(a, b) {
              return new Dimension(a.value % b.value, a.unit);
            },
            pow: function(x, y) {
              if (typeof x === "number" && typeof y === "number") {
                x = new Dimension(x);
                y = new Dimension(y);
              } else if (
                !(x instanceof Dimension) ||
                !(y instanceof Dimension)
              ) {
                throw {
                  type: "Argument",
                  message: "arguments must be numbers"
                };
              }

              return new Dimension(Math.pow(x.value, y.value), x.unit);
            },
            percentage: function(n) {
              var result = mathHelper._math(
                function(num) {
                  return num * 100;
                },
                "%",
                n
              );

              return result;
            }
          });
        },
        {
          "../tree/anonymous": 46,
          "../tree/dimension": 56,
          "./function-registry": 22,
          "./math-helper.js": 24
        }
      ],
      27: [
        function(require, module, exports) {
          var Quoted = require("../tree/quoted"),
            Anonymous = require("../tree/anonymous"),
            JavaScript = require("../tree/javascript"),
            functionRegistry = require("./function-registry");

          functionRegistry.addMultiple({
            e: function(str) {
              return new Anonymous(
                str instanceof JavaScript ? str.evaluated : str.value
              );
            },
            escape: function(str) {
              return new Anonymous(
                encodeURI(str.value)
                  .replace(/=/g, "%3D")
                  .replace(/:/g, "%3A")
                  .replace(/#/g, "%23")
                  .replace(/;/g, "%3B")
                  .replace(/\(/g, "%28")
                  .replace(/\)/g, "%29")
              );
            },
            replace: function(string, pattern, replacement, flags) {
              var result = string.value;
              replacement =
                replacement.type === "Quoted"
                  ? replacement.value
                  : replacement.toCSS();
              result = result.replace(
                new RegExp(pattern.value, flags ? flags.value : ""),
                replacement
              );
              return new Quoted(string.quote || "", result, string.escaped);
            },
            "%": function(string /* arg, arg, ...*/) {
              var args = Array.prototype.slice.call(arguments, 1),
                result = string.value;

              for (var i = 0; i < args.length; i++) {
                /*jshint loopfunc:true */
                result = result.replace(/%[sda]/i, function(token) {
                  var value =
                    args[i].type === "Quoted" && token.match(/s/i)
                      ? args[i].value
                      : args[i].toCSS();
                  return token.match(/[A-Z]$/)
                    ? encodeURIComponent(value)
                    : value;
                });
              }
              result = result.replace(/%%/g, "%");
              return new Quoted(string.quote || "", result, string.escaped);
            }
          });
        },
        {
          "../tree/anonymous": 46,
          "../tree/javascript": 63,
          "../tree/quoted": 73,
          "./function-registry": 22
        }
      ],
      28: [
        function(require, module, exports) {
          module.exports = function(environment) {
            var Dimension = require("../tree/dimension"),
              Color = require("../tree/color"),
              Expression = require("../tree/expression"),
              Quoted = require("../tree/quoted"),
              URL = require("../tree/url"),
              functionRegistry = require("./function-registry");

            functionRegistry.add("svg-gradient", function(direction) {
              var stops,
                gradientDirectionSvg,
                gradientType = "linear",
                rectangleDimension = 'x="0" y="0" width="1" height="1"',
                renderEnv = { compress: false },
                returner,
                directionValue = direction.toCSS(renderEnv),
                i,
                color,
                position,
                positionValue,
                alpha;

              function throwArgumentDescriptor() {
                throw {
                  type: "Argument",
                  message:
                    "svg-gradient expects direction, start_color [start_position], [color position,]...," +
                    " end_color [end_position] or direction, color list"
                };
              }

              if (arguments.length == 2) {
                if (arguments[1].value.length < 2) {
                  throwArgumentDescriptor();
                }
                stops = arguments[1].value;
              } else if (arguments.length < 3) {
                throwArgumentDescriptor();
              } else {
                stops = Array.prototype.slice.call(arguments, 1);
              }

              switch (directionValue) {
                case "to bottom":
                  gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
                  break;
                case "to right":
                  gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
                  break;
                case "to bottom right":
                  gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
                  break;
                case "to top right":
                  gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
                  break;
                case "ellipse":
                case "ellipse at center":
                  gradientType = "radial";
                  gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
                  rectangleDimension =
                    'x="-50" y="-50" width="101" height="101"';
                  break;
                default:
                  throw {
                    type: "Argument",
                    message:
                      "svg-gradient direction must be 'to bottom', 'to right'," +
                      " 'to bottom right', 'to top right' or 'ellipse at center'"
                  };
              }
              returner =
                '<?xml version="1.0" ?>' +
                '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' +
                "<" +
                gradientType +
                'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' +
                gradientDirectionSvg +
                ">";

              for (i = 0; i < stops.length; i += 1) {
                if (stops[i] instanceof Expression) {
                  color = stops[i].value[0];
                  position = stops[i].value[1];
                } else {
                  color = stops[i];
                  position = undefined;
                }

                if (
                  !(color instanceof Color) ||
                  (!(
                    (i === 0 || i + 1 === stops.length) &&
                    position === undefined
                  ) &&
                    !(position instanceof Dimension))
                ) {
                  throwArgumentDescriptor();
                }
                positionValue = position
                  ? position.toCSS(renderEnv)
                  : i === 0
                  ? "0%"
                  : "100%";
                alpha = color.alpha;
                returner +=
                  '<stop offset="' +
                  positionValue +
                  '" stop-color="' +
                  color.toRGB() +
                  '"' +
                  (alpha < 1 ? ' stop-opacity="' + alpha + '"' : "") +
                  "/>";
              }
              returner +=
                "</" +
                gradientType +
                "Gradient>" +
                "<rect " +
                rectangleDimension +
                ' fill="url(#gradient)" /></svg>';

              returner = encodeURIComponent(returner);

              returner = "data:image/svg+xml," + returner;
              return new URL(
                new Quoted(
                  "'" + returner + "'",
                  returner,
                  false,
                  this.index,
                  this.currentFileInfo
                ),
                this.index,
                this.currentFileInfo
              );
            });
          };
        },
        {
          "../tree/color": 50,
          "../tree/dimension": 56,
          "../tree/expression": 59,
          "../tree/quoted": 73,
          "../tree/url": 80,
          "./function-registry": 22
        }
      ],
      29: [
        function(require, module, exports) {
          var Keyword = require("../tree/keyword"),
            DetachedRuleset = require("../tree/detached-ruleset"),
            Dimension = require("../tree/dimension"),
            Color = require("../tree/color"),
            Quoted = require("../tree/quoted"),
            Anonymous = require("../tree/anonymous"),
            URL = require("../tree/url"),
            Operation = require("../tree/operation"),
            functionRegistry = require("./function-registry");

          var isa = function(n, Type) {
              return n instanceof Type ? Keyword.True : Keyword.False;
            },
            isunit = function(n, unit) {
              if (unit === undefined) {
                throw {
                  type: "Argument",
                  message: "missing the required second argument to isunit."
                };
              }
              unit = typeof unit.value === "string" ? unit.value : unit;
              if (typeof unit !== "string") {
                throw {
                  type: "Argument",
                  message:
                    "Second argument to isunit should be a unit or a string."
                };
              }
              return n instanceof Dimension && n.unit.is(unit)
                ? Keyword.True
                : Keyword.False;
            },
            getItemsFromNode = function(node) {
              // handle non-array values as an array of length 1
              // return 'undefined' if index is invalid
              var items = Array.isArray(node.value) ? node.value : Array(node);

              return items;
            };
          functionRegistry.addMultiple({
            isruleset: function(n) {
              return isa(n, DetachedRuleset);
            },
            iscolor: function(n) {
              return isa(n, Color);
            },
            isnumber: function(n) {
              return isa(n, Dimension);
            },
            isstring: function(n) {
              return isa(n, Quoted);
            },
            iskeyword: function(n) {
              return isa(n, Keyword);
            },
            isurl: function(n) {
              return isa(n, URL);
            },
            ispixel: function(n) {
              return isunit(n, "px");
            },
            ispercentage: function(n) {
              return isunit(n, "%");
            },
            isem: function(n) {
              return isunit(n, "em");
            },
            isunit: isunit,
            unit: function(val, unit) {
              if (!(val instanceof Dimension)) {
                throw {
                  type: "Argument",
                  message:
                    "the first argument to unit must be a number" +
                    (val instanceof Operation
                      ? ". Have you forgotten parenthesis?"
                      : "")
                };
              }
              if (unit) {
                if (unit instanceof Keyword) {
                  unit = unit.value;
                } else {
                  unit = unit.toCSS();
                }
              } else {
                unit = "";
              }
              return new Dimension(val.value, unit);
            },
            "get-unit": function(n) {
              return new Anonymous(n.unit);
            },
            extract: function(values, index) {
              index = index.value - 1; // (1-based index)

              return getItemsFromNode(values)[index];
            },
            length: function(values) {
              return new Dimension(getItemsFromNode(values).length);
            }
          });
        },
        {
          "../tree/anonymous": 46,
          "../tree/color": 50,
          "../tree/detached-ruleset": 55,
          "../tree/dimension": 56,
          "../tree/keyword": 65,
          "../tree/operation": 71,
          "../tree/quoted": 73,
          "../tree/url": 80,
          "./function-registry": 22
        }
      ],
      30: [
        function(require, module, exports) {
          var contexts = require("./contexts"),
            Parser = require("./parser/parser"),
            FunctionImporter = require("./plugins/function-importer");

          module.exports = function(environment) {
            // FileInfo = {
            //  'relativeUrls' - option - whether to adjust URL's to be relative
            //  'filename' - full resolved filename of current file
            //  'rootpath' - path to append to normal URLs for this node
            //  'currentDirectory' - path to the current file, absolute
            //  'rootFilename' - filename of the base file
            //  'entryPath' - absolute path to the entry file
            //  'reference' - whether the file should not be output and only output parts that are referenced

            var ImportManager = function(context, rootFileInfo) {
              this.rootFilename = rootFileInfo.filename;
              this.paths = context.paths || []; // Search paths, when importing
              this.contents = {}; // map - filename to contents of all the files
              this.contentsIgnoredChars = {}; // map - filename to lines at the beginning of each file to ignore
              this.mime = context.mime;
              this.error = null;
              this.context = context;
              // Deprecated? Unused outside of here, could be useful.
              this.queue = []; // Files which haven't been imported yet
              this.files = {}; // Holds the imported parse trees.
            };
            /**
             * Add an import to be imported
             * @param path - the raw path
             * @param tryAppendLessExtension - whether to try appending the less extension (if the path has no extension)
             * @param currentFileInfo - the current file info (used for instance to work out relative paths)
             * @param importOptions - import options
             * @param callback - callback for when it is imported
             */
            ImportManager.prototype.push = function(
              path,
              tryAppendLessExtension,
              currentFileInfo,
              importOptions,
              callback
            ) {
              var importManager = this;
              this.queue.push(path);

              var fileParsedFunc = function(e, root, fullPath) {
                importManager.queue.splice(
                  importManager.queue.indexOf(path),
                  1
                ); // Remove the path from the queue

                var importedEqualsRoot =
                  fullPath === importManager.rootFilename;
                if (importOptions.optional && e) {
                  callback(null, { rules: [] }, false, null);
                } else {
                  importManager.files[fullPath] = root;
                  if (e && !importManager.error) {
                    importManager.error = e;
                  }
                  callback(e, root, importedEqualsRoot, fullPath);
                }
              };

              var newFileInfo = {
                relativeUrls: this.context.relativeUrls,
                entryPath: currentFileInfo.entryPath,
                rootpath: currentFileInfo.rootpath,
                rootFilename: currentFileInfo.rootFilename
              };

              var fileManager = environment.getFileManager(
                path,
                currentFileInfo.currentDirectory,
                this.context,
                environment
              );

              if (!fileManager) {
                fileParsedFunc({
                  message: "Could not find a file-manager for " + path
                });
                return;
              }

              if (tryAppendLessExtension) {
                path = fileManager.tryAppendExtension(
                  path,
                  importOptions.plugin ? ".js" : ".less"
                );
              }

              var loadFileCallback = function(loadedFile) {
                var resolvedFilename = loadedFile.filename,
                  contents = loadedFile.contents.replace(/^\uFEFF/, "");

                // Pass on an updated rootpath if path of imported file is relative and file
                // is in a (sub|sup) directory
                //
                // Examples:
                // - If path of imported file is 'module/nav/nav.less' and rootpath is 'less/',
                //   then rootpath should become 'less/module/nav/'
                // - If path of imported file is '../mixins.less' and rootpath is 'less/',
                //   then rootpath should become 'less/../'
                newFileInfo.currentDirectory = fileManager.getPath(
                  resolvedFilename
                );
                if (newFileInfo.relativeUrls) {
                  newFileInfo.rootpath = fileManager.join(
                    importManager.context.rootpath || "",
                    fileManager.pathDiff(
                      newFileInfo.currentDirectory,
                      newFileInfo.entryPath
                    )
                  );

                  if (
                    !fileManager.isPathAbsolute(newFileInfo.rootpath) &&
                    fileManager.alwaysMakePathsAbsolute()
                  ) {
                    newFileInfo.rootpath = fileManager.join(
                      newFileInfo.entryPath,
                      newFileInfo.rootpath
                    );
                  }
                }
                newFileInfo.filename = resolvedFilename;

                var newEnv = new contexts.Parse(importManager.context);

                newEnv.processImports = false;
                importManager.contents[resolvedFilename] = contents;

                if (currentFileInfo.reference || importOptions.reference) {
                  newFileInfo.reference = true;
                }

                if (importOptions.plugin) {
                  new FunctionImporter(newEnv, newFileInfo).eval(
                    contents,
                    function(e, root) {
                      fileParsedFunc(e, root, resolvedFilename);
                    }
                  );
                } else if (importOptions.inline) {
                  fileParsedFunc(null, contents, resolvedFilename);
                } else {
                  new Parser(newEnv, importManager, newFileInfo).parse(
                    contents,
                    function(e, root) {
                      fileParsedFunc(e, root, resolvedFilename);
                    }
                  );
                }
              };

              var promise = fileManager.loadFile(
                path,
                currentFileInfo.currentDirectory,
                this.context,
                environment,
                function(err, loadedFile) {
                  if (err) {
                    fileParsedFunc(err);
                  } else {
                    loadFileCallback(loadedFile);
                  }
                }
              );
              if (promise) {
                promise.then(loadFileCallback, fileParsedFunc);
              }
            };
            return ImportManager;
          };
        },
        {
          "./contexts": 11,
          "./parser/parser": 38,
          "./plugins/function-importer": 40
        }
      ],
      31: [
        function(require, module, exports) {
          module.exports = function(environment, fileManagers) {
            var SourceMapOutput,
              SourceMapBuilder,
              ParseTree,
              ImportManager,
              Environment;

            var less = {
              version: [2, 7, 3],
              data: require("./data"),
              tree: require("./tree"),
              Environment: (Environment = require("./environment/environment")),
              AbstractFileManager: require("./environment/abstract-file-manager"),
              environment: (environment = new Environment(
                environment,
                fileManagers
              )),
              visitors: require("./visitors"),
              Parser: require("./parser/parser"),
              functions: require("./functions")(environment),
              contexts: require("./contexts"),
              SourceMapOutput: (SourceMapOutput = require("./source-map-output")(
                environment
              )),
              SourceMapBuilder: (SourceMapBuilder = require("./source-map-builder")(
                SourceMapOutput,
                environment
              )),
              ParseTree: (ParseTree = require("./parse-tree")(
                SourceMapBuilder
              )),
              ImportManager: (ImportManager = require("./import-manager")(
                environment
              )),
              render: require("./render")(
                environment,
                ParseTree,
                ImportManager
              ),
              parse: require("./parse")(environment, ParseTree, ImportManager),
              LessError: require("./less-error"),
              transformTree: require("./transform-tree"),
              utils: require("./utils"),
              PluginManager: require("./plugin-manager"),
              logger: require("./logger")
            };

            return less;
          };
        },
        {
          "./contexts": 11,
          "./data": 13,
          "./environment/abstract-file-manager": 15,
          "./environment/environment": 16,
          "./functions": 23,
          "./import-manager": 30,
          "./less-error": 32,
          "./logger": 33,
          "./parse": 35,
          "./parse-tree": 34,
          "./parser/parser": 38,
          "./plugin-manager": 39,
          "./render": 41,
          "./source-map-builder": 42,
          "./source-map-output": 43,
          "./transform-tree": 44,
          "./tree": 62,
          "./utils": 83,
          "./visitors": 87
        }
      ],
      32: [
        function(require, module, exports) {
          var utils = require("./utils");

          var LessError = (module.exports = function LessError(
            e,
            importManager,
            currentFilename
          ) {
            Error.call(this);

            var filename = e.filename || currentFilename;

            if (importManager && filename) {
              var input = importManager.contents[filename],
                loc = utils.getLocation(e.index, input),
                line = loc.line,
                col = loc.column,
                callLine = e.call && utils.getLocation(e.call, input).line,
                lines = input.split("\n");

              this.type = e.type || "Syntax";
              this.filename = filename;
              this.index = e.index;
              this.line = typeof line === "number" ? line + 1 : null;
              this.callLine = callLine + 1;
              this.callExtract = lines[callLine];
              this.column = col;
              this.extract = [lines[line - 1], lines[line], lines[line + 1]];
            }
            this.message = e.message;
            this.stack = e.stack;
          });

          if (typeof Object.create === "undefined") {
            var F = function() {};
            F.prototype = Error.prototype;
            LessError.prototype = new F();
          } else {
            LessError.prototype = Object.create(Error.prototype);
          }

          LessError.prototype.constructor = LessError;
        },
        { "./utils": 83 }
      ],
      33: [
        function(require, module, exports) {
          module.exports = {
            error: function(msg) {
              this._fireEvent("error", msg);
            },
            warn: function(msg) {
              this._fireEvent("warn", msg);
            },
            info: function(msg) {
              this._fireEvent("info", msg);
            },
            debug: function(msg) {
              this._fireEvent("debug", msg);
            },
            addListener: function(listener) {
              this._listeners.push(listener);
            },
            removeListener: function(listener) {
              for (var i = 0; i < this._listeners.length; i++) {
                if (this._listeners[i] === listener) {
                  this._listeners.splice(i, 1);
                  return;
                }
              }
            },
            _fireEvent: function(type, msg) {
              for (var i = 0; i < this._listeners.length; i++) {
                var logFunction = this._listeners[i][type];
                if (logFunction) {
                  logFunction(msg);
                }
              }
            },
            _listeners: []
          };
        },
        {}
      ],
      34: [
        function(require, module, exports) {
          var LessError = require("./less-error"),
            transformTree = require("./transform-tree"),
            logger = require("./logger");

          module.exports = function(SourceMapBuilder) {
            var ParseTree = function(root, imports) {
              this.root = root;
              this.imports = imports;
            };

            ParseTree.prototype.toCSS = function(options) {
              var evaldRoot,
                result = {},
                sourceMapBuilder;
              try {
                evaldRoot = transformTree(this.root, options);
              } catch (e) {
                throw new LessError(e, this.imports);
              }

              try {
                var compress = Boolean(options.compress);
                if (compress) {
                  logger.warn(
                    "The compress option has been deprecated. We recommend you use a dedicated css minifier, for instance see less-plugin-clean-css."
                  );
                }

                var toCSSOptions = {
                  compress: compress,
                  dumpLineNumbers: options.dumpLineNumbers,
                  strictUnits: Boolean(options.strictUnits),
                  numPrecision: 8
                };

                if (options.sourceMap) {
                  sourceMapBuilder = new SourceMapBuilder(options.sourceMap);
                  result.css = sourceMapBuilder.toCSS(
                    evaldRoot,
                    toCSSOptions,
                    this.imports
                  );
                } else {
                  result.css = evaldRoot.toCSS(toCSSOptions);
                }
              } catch (e) {
                throw new LessError(e, this.imports);
              }

              if (options.pluginManager) {
                var postProcessors = options.pluginManager.getPostProcessors();
                for (var i = 0; i < postProcessors.length; i++) {
                  result.css = postProcessors[i].process(result.css, {
                    sourceMap: sourceMapBuilder,
                    options: options,
                    imports: this.imports
                  });
                }
              }
              if (options.sourceMap) {
                result.map = sourceMapBuilder.getExternalSourceMap();
              }

              result.imports = [];
              for (var file in this.imports.files) {
                if (
                  this.imports.files.hasOwnProperty(file) &&
                  file !== this.imports.rootFilename
                ) {
                  result.imports.push(file);
                }
              }
              return result;
            };
            return ParseTree;
          };
        },
        { "./less-error": 32, "./logger": 33, "./transform-tree": 44 }
      ],
      35: [
        function(require, module, exports) {
          var PromiseConstructor,
            contexts = require("./contexts"),
            Parser = require("./parser/parser"),
            PluginManager = require("./plugin-manager");

          module.exports = function(environment, ParseTree, ImportManager) {
            var parse = function(input, options, callback) {
              options = options || {};

              if (typeof options === "function") {
                callback = options;
                options = {};
              }

              if (!callback) {
                if (!PromiseConstructor) {
                  PromiseConstructor =
                    typeof Promise === "undefined"
                      ? require("promise")
                      : Promise;
                }
                var self = this;
                return new PromiseConstructor(function(resolve, reject) {
                  parse.call(self, input, options, function(err, output) {
                    if (err) {
                      reject(err);
                    } else {
                      resolve(output);
                    }
                  });
                });
              } else {
                var context,
                  rootFileInfo,
                  pluginManager = new PluginManager(this);

                pluginManager.addPlugins(options.plugins);
                options.pluginManager = pluginManager;

                context = new contexts.Parse(options);

                if (options.rootFileInfo) {
                  rootFileInfo = options.rootFileInfo;
                } else {
                  var filename = options.filename || "input";
                  var entryPath = filename.replace(/[^\/\\]*$/, "");
                  rootFileInfo = {
                    filename: filename,
                    relativeUrls: context.relativeUrls,
                    rootpath: context.rootpath || "",
                    currentDirectory: entryPath,
                    entryPath: entryPath,
                    rootFilename: filename
                  };
                  // add in a missing trailing slash
                  if (
                    rootFileInfo.rootpath &&
                    rootFileInfo.rootpath.slice(-1) !== "/"
                  ) {
                    rootFileInfo.rootpath += "/";
                  }
                }

                var imports = new ImportManager(context, rootFileInfo);

                new Parser(context, imports, rootFileInfo).parse(
                  input,
                  function(e, root) {
                    if (e) {
                      return callback(e);
                    }
                    callback(null, root, imports, options);
                  },
                  options
                );
              }
            };
            return parse;
          };
        },
        {
          "./contexts": 11,
          "./parser/parser": 38,
          "./plugin-manager": 39,
          promise: undefined
        }
      ],
      36: [
        function(require, module, exports) {
          // Split the input into chunks.
          module.exports = function(input, fail) {
            var len = input.length,
              level = 0,
              parenLevel = 0,
              lastOpening,
              lastOpeningParen,
              lastMultiComment,
              lastMultiCommentEndBrace,
              chunks = [],
              emitFrom = 0,
              chunkerCurrentIndex,
              currentChunkStartIndex,
              cc,
              cc2,
              matched;

            function emitChunk(force) {
              var len = chunkerCurrentIndex - emitFrom;
              if ((len < 512 && !force) || !len) {
                return;
              }
              chunks.push(input.slice(emitFrom, chunkerCurrentIndex + 1));
              emitFrom = chunkerCurrentIndex + 1;
            }

            for (
              chunkerCurrentIndex = 0;
              chunkerCurrentIndex < len;
              chunkerCurrentIndex++
            ) {
              cc = input.charCodeAt(chunkerCurrentIndex);
              if ((cc >= 97 && cc <= 122) || cc < 34) {
                // a-z or whitespace
                continue;
              }

              switch (cc) {
                case 40: // (
                  parenLevel++;
                  lastOpeningParen = chunkerCurrentIndex;
                  continue;
                case 41: // )
                  if (--parenLevel < 0) {
                    return fail("missing opening `(`", chunkerCurrentIndex);
                  }
                  continue;
                case 59: // ;
                  if (!parenLevel) {
                    emitChunk();
                  }
                  continue;
                case 123: // {
                  level++;
                  lastOpening = chunkerCurrentIndex;
                  continue;
                case 125: // }
                  if (--level < 0) {
                    return fail("missing opening `{`", chunkerCurrentIndex);
                  }
                  if (!level && !parenLevel) {
                    emitChunk();
                  }
                  continue;
                case 92: // \
                  if (chunkerCurrentIndex < len - 1) {
                    chunkerCurrentIndex++;
                    continue;
                  }
                  return fail("unescaped `\\`", chunkerCurrentIndex);
                case 34:
                case 39:
                case 96: // ", ' and `
                  matched = 0;
                  currentChunkStartIndex = chunkerCurrentIndex;
                  for (
                    chunkerCurrentIndex = chunkerCurrentIndex + 1;
                    chunkerCurrentIndex < len;
                    chunkerCurrentIndex++
                  ) {
                    cc2 = input.charCodeAt(chunkerCurrentIndex);
                    if (cc2 > 96) {
                      continue;
                    }
                    if (cc2 == cc) {
                      matched = 1;
                      break;
                    }
                    if (cc2 == 92) {
                      // \
                      if (chunkerCurrentIndex == len - 1) {
                        return fail("unescaped `\\`", chunkerCurrentIndex);
                      }
                      chunkerCurrentIndex++;
                    }
                  }
                  if (matched) {
                    continue;
                  }
                  return fail(
                    "unmatched `" + String.fromCharCode(cc) + "`",
                    currentChunkStartIndex
                  );
                case 47: // /, check for comment
                  if (parenLevel || chunkerCurrentIndex == len - 1) {
                    continue;
                  }
                  cc2 = input.charCodeAt(chunkerCurrentIndex + 1);
                  if (cc2 == 47) {
                    // //, find lnfeed
                    for (
                      chunkerCurrentIndex = chunkerCurrentIndex + 2;
                      chunkerCurrentIndex < len;
                      chunkerCurrentIndex++
                    ) {
                      cc2 = input.charCodeAt(chunkerCurrentIndex);
                      if (cc2 <= 13 && (cc2 == 10 || cc2 == 13)) {
                        break;
                      }
                    }
                  } else if (cc2 == 42) {
                    // /*, find */
                    lastMultiComment = currentChunkStartIndex = chunkerCurrentIndex;
                    for (
                      chunkerCurrentIndex = chunkerCurrentIndex + 2;
                      chunkerCurrentIndex < len - 1;
                      chunkerCurrentIndex++
                    ) {
                      cc2 = input.charCodeAt(chunkerCurrentIndex);
                      if (cc2 == 125) {
                        lastMultiCommentEndBrace = chunkerCurrentIndex;
                      }
                      if (cc2 != 42) {
                        continue;
                      }
                      if (input.charCodeAt(chunkerCurrentIndex + 1) == 47) {
                        break;
                      }
                    }
                    if (chunkerCurrentIndex == len - 1) {
                      return fail(
                        "missing closing `*/`",
                        currentChunkStartIndex
                      );
                    }
                    chunkerCurrentIndex++;
                  }
                  continue;
                case 42: // *, check for unmatched */
                  if (
                    chunkerCurrentIndex < len - 1 &&
                    input.charCodeAt(chunkerCurrentIndex + 1) == 47
                  ) {
                    return fail("unmatched `/*`", chunkerCurrentIndex);
                  }
                  continue;
              }
            }

            if (level !== 0) {
              if (
                lastMultiComment > lastOpening &&
                lastMultiCommentEndBrace > lastMultiComment
              ) {
                return fail("missing closing `}` or `*/`", lastOpening);
              } else {
                return fail("missing closing `}`", lastOpening);
              }
            } else if (parenLevel !== 0) {
              return fail("missing closing `)`", lastOpeningParen);
            }

            emitChunk(true);
            return chunks;
          };
        },
        {}
      ],
      37: [
        function(require, module, exports) {
          var chunker = require("./chunker");

          module.exports = function() {
            var input, // LeSS input string
              j, // current chunk
              saveStack = [], // holds state for backtracking
              furthest, // furthest index the parser has gone to
              furthestPossibleErrorMessage, // if this is furthest we got to, this is the probably cause
              chunks, // chunkified input
              current, // current chunk
              currentPos, // index of current chunk, in `input`
              parserInput = {};

            var CHARCODE_SPACE = 32,
              CHARCODE_TAB = 9,
              CHARCODE_LF = 10,
              CHARCODE_CR = 13,
              CHARCODE_PLUS = 43,
              CHARCODE_COMMA = 44,
              CHARCODE_FORWARD_SLASH = 47,
              CHARCODE_9 = 57;

            function skipWhitespace(length) {
              var oldi = parserInput.i,
                oldj = j,
                curr = parserInput.i - currentPos,
                endIndex = parserInput.i + current.length - curr,
                mem = (parserInput.i += length),
                inp = input,
                c,
                nextChar,
                comment;

              for (; parserInput.i < endIndex; parserInput.i++) {
                c = inp.charCodeAt(parserInput.i);

                if (
                  parserInput.autoCommentAbsorb &&
                  c === CHARCODE_FORWARD_SLASH
                ) {
                  nextChar = inp.charAt(parserInput.i + 1);
                  if (nextChar === "/") {
                    comment = { index: parserInput.i, isLineComment: true };
                    var nextNewLine = inp.indexOf("\n", parserInput.i + 2);
                    if (nextNewLine < 0) {
                      nextNewLine = endIndex;
                    }
                    parserInput.i = nextNewLine;
                    comment.text = inp.substr(
                      comment.index,
                      parserInput.i - comment.index
                    );
                    parserInput.commentStore.push(comment);
                    continue;
                  } else if (nextChar === "*") {
                    var nextStarSlash = inp.indexOf("*/", parserInput.i + 2);
                    if (nextStarSlash >= 0) {
                      comment = {
                        index: parserInput.i,
                        text: inp.substr(
                          parserInput.i,
                          nextStarSlash + 2 - parserInput.i
                        ),
                        isLineComment: false
                      };
                      parserInput.i += comment.text.length - 1;
                      parserInput.commentStore.push(comment);
                      continue;
                    }
                  }
                  break;
                }

                if (
                  c !== CHARCODE_SPACE &&
                  c !== CHARCODE_LF &&
                  c !== CHARCODE_TAB &&
                  c !== CHARCODE_CR
                ) {
                  break;
                }
              }

              current = current.slice(length + parserInput.i - mem + curr);
              currentPos = parserInput.i;

              if (!current.length) {
                if (j < chunks.length - 1) {
                  current = chunks[++j];
                  skipWhitespace(0); // skip space at the beginning of a chunk
                  return true; // things changed
                }
                parserInput.finished = true;
              }

              return oldi !== parserInput.i || oldj !== j;
            }

            parserInput.save = function() {
              currentPos = parserInput.i;
              saveStack.push({ current: current, i: parserInput.i, j: j });
            };
            parserInput.restore = function(possibleErrorMessage) {
              if (
                parserInput.i > furthest ||
                (parserInput.i === furthest &&
                  possibleErrorMessage &&
                  !furthestPossibleErrorMessage)
              ) {
                furthest = parserInput.i;
                furthestPossibleErrorMessage = possibleErrorMessage;
              }
              var state = saveStack.pop();
              current = state.current;
              currentPos = parserInput.i = state.i;
              j = state.j;
            };
            parserInput.forget = function() {
              saveStack.pop();
            };
            parserInput.isWhitespace = function(offset) {
              var pos = parserInput.i + (offset || 0),
                code = input.charCodeAt(pos);
              return (
                code === CHARCODE_SPACE ||
                code === CHARCODE_CR ||
                code === CHARCODE_TAB ||
                code === CHARCODE_LF
              );
            };

            // Specialization of $(tok)
            parserInput.$re = function(tok) {
              if (parserInput.i > currentPos) {
                current = current.slice(parserInput.i - currentPos);
                currentPos = parserInput.i;
              }

              var m = tok.exec(current);
              if (!m) {
                return null;
              }

              skipWhitespace(m[0].length);
              if (typeof m === "string") {
                return m;
              }

              return m.length === 1 ? m[0] : m;
            };

            parserInput.$char = function(tok) {
              if (input.charAt(parserInput.i) !== tok) {
                return null;
              }
              skipWhitespace(1);
              return tok;
            };

            parserInput.$str = function(tok) {
              var tokLength = tok.length;

              // https://jsperf.com/string-startswith/21
              for (var i = 0; i < tokLength; i++) {
                if (input.charAt(parserInput.i + i) !== tok.charAt(i)) {
                  return null;
                }
              }

              skipWhitespace(tokLength);
              return tok;
            };

            parserInput.$quoted = function() {
              var startChar = input.charAt(parserInput.i);
              if (startChar !== "'" && startChar !== '"') {
                return;
              }
              var length = input.length,
                currentPosition = parserInput.i;

              for (var i = 1; i + currentPosition < length; i++) {
                var nextChar = input.charAt(i + currentPosition);
                switch (nextChar) {
                  case "\\":
                    i++;
                    continue;
                  case "\r":
                  case "\n":
                    break;
                  case startChar:
                    var str = input.substr(currentPosition, i + 1);
                    skipWhitespace(i + 1);
                    return str;
                  default:
                }
              }
              return null;
            };

            parserInput.autoCommentAbsorb = true;
            parserInput.commentStore = [];
            parserInput.finished = false;

            // Same as $(), but don't change the state of the parser,
            // just return the match.
            parserInput.peek = function(tok) {
              if (typeof tok === "string") {
                // https://jsperf.com/string-startswith/21
                for (var i = 0; i < tok.length; i++) {
                  if (input.charAt(parserInput.i + i) !== tok.charAt(i)) {
                    return false;
                  }
                }
                return true;
              } else {
                return tok.test(current);
              }
            };

            // Specialization of peek()
            // TODO remove or change some currentChar calls to peekChar
            parserInput.peekChar = function(tok) {
              return input.charAt(parserInput.i) === tok;
            };

            parserInput.currentChar = function() {
              return input.charAt(parserInput.i);
            };

            parserInput.getInput = function() {
              return input;
            };

            parserInput.peekNotNumeric = function() {
              var c = input.charCodeAt(parserInput.i);
              //Is the first char of the dimension 0-9, '.', '+' or '-'
              return (
                c > CHARCODE_9 ||
                c < CHARCODE_PLUS ||
                c === CHARCODE_FORWARD_SLASH ||
                c === CHARCODE_COMMA
              );
            };

            parserInput.start = function(str, chunkInput, failFunction) {
              input = str;
              parserInput.i = j = currentPos = furthest = 0;

              // chunking apparently makes things quicker (but my tests indicate
              // it might actually make things slower in node at least)
              // and it is a non-perfect parse - it can't recognise
              // unquoted urls, meaning it can't distinguish comments
              // meaning comments with quotes or {}() in them get 'counted'
              // and then lead to parse errors.
              // In addition if the chunking chunks in the wrong place we might
              // not be able to parse a parser statement in one go
              // this is officially deprecated but can be switched on via an option
              // in the case it causes too much performance issues.
              if (chunkInput) {
                chunks = chunker(str, failFunction);
              } else {
                chunks = [str];
              }

              current = chunks[0];

              skipWhitespace(0);
            };

            parserInput.end = function() {
              var message,
                isFinished = parserInput.i >= input.length;

              if (parserInput.i < furthest) {
                message = furthestPossibleErrorMessage;
                parserInput.i = furthest;
              }
              return {
                isFinished: isFinished,
                furthest: parserInput.i,
                furthestPossibleErrorMessage: message,
                furthestReachedEnd: parserInput.i >= input.length - 1,
                furthestChar: input[parserInput.i]
              };
            };

            return parserInput;
          };
        },
        { "./chunker": 36 }
      ],
      38: [
        function(require, module, exports) {
          var LessError = require("../less-error"),
            tree = require("../tree"),
            visitors = require("../visitors"),
            getParserInput = require("./parser-input"),
            utils = require("../utils");

          //
          // less.js - parser
          //
          //    A relatively straight-forward predictive parser.
          //    There is no tokenization/lexing stage, the input is parsed
          //    in one sweep.
          //
          //    To make the parser fast enough to run in the browser, several
          //    optimization had to be made:
          //
          //    - Matching and slicing on a huge input is often cause of slowdowns.
          //      The solution is to chunkify the input into smaller strings.
          //      The chunks are stored in the `chunks` var,
          //      `j` holds the current chunk index, and `currentPos` holds
          //      the index of the current chunk in relation to `input`.
          //      This gives us an almost 4x speed-up.
          //
          //    - In many cases, we don't need to match individual tokens;
          //      for example, if a value doesn't hold any variables, operations
          //      or dynamic references, the parser can effectively 'skip' it,
          //      treating it as a literal.
          //      An example would be '1px solid #000' - which evaluates to itself,
          //      we don't need to know what the individual components are.
          //      The drawback, of course is that you don't get the benefits of
          //      syntax-checking on the CSS. This gives us a 50% speed-up in the parser,
          //      and a smaller speed-up in the code-gen.
          //
          //
          //    Token matching is done with the `$` function, which either takes
          //    a terminal string or regexp, or a non-terminal function to call.
          //    It also takes care of moving all the indices forwards.
          //`
          //
          var Parser = function Parser(context, imports, fileInfo) {
            var parsers,
              parserInput = getParserInput();

            function error(msg, type) {
              throw new LessError(
                {
                  index: parserInput.i,
                  filename: fileInfo.filename,
                  type: type || "Syntax",
                  message: msg
                },
                imports
              );
            }

            function expect(arg, msg, index) {
              // some older browsers return typeof 'function' for RegExp
              var result =
                arg instanceof Function
                  ? arg.call(parsers)
                  : parserInput.$re(arg);
              if (result) {
                return result;
              }
              error(
                msg ||
                  (typeof arg === "string"
                    ? "expected '" +
                      arg +
                      "' got '" +
                      parserInput.currentChar() +
                      "'"
                    : "unexpected token")
              );
            }

            // Specialization of expect()
            function expectChar(arg, msg) {
              if (parserInput.$char(arg)) {
                return arg;
              }
              error(
                msg ||
                  "expected '" +
                    arg +
                    "' got '" +
                    parserInput.currentChar() +
                    "'"
              );
            }

            function getDebugInfo(index) {
              var filename = fileInfo.filename;

              return {
                lineNumber:
                  utils.getLocation(index, parserInput.getInput()).line + 1,
                fileName: filename
              };
            }

            //
            // The Parser
            //
            return {
              //
              // Parse an input string into an abstract syntax tree,
              // @param str A string containing 'less' markup
              // @param callback call `callback` when done.
              // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply
              //
              parse: function(str, callback, additionalData) {
                var root,
                  error = null,
                  globalVars,
                  modifyVars,
                  ignored,
                  preText = "";

                globalVars =
                  additionalData && additionalData.globalVars
                    ? Parser.serializeVars(additionalData.globalVars) + "\n"
                    : "";
                modifyVars =
                  additionalData && additionalData.modifyVars
                    ? "\n" + Parser.serializeVars(additionalData.modifyVars)
                    : "";

                if (context.pluginManager) {
                  var preProcessors = context.pluginManager.getPreProcessors();
                  for (var i = 0; i < preProcessors.length; i++) {
                    str = preProcessors[i].process(str, {
                      context: context,
                      imports: imports,
                      fileInfo: fileInfo
                    });
                  }
                }

                if (globalVars || (additionalData && additionalData.banner)) {
                  preText =
                    (additionalData && additionalData.banner
                      ? additionalData.banner
                      : "") + globalVars;
                  ignored = imports.contentsIgnoredChars;
                  ignored[fileInfo.filename] = ignored[fileInfo.filename] || 0;
                  ignored[fileInfo.filename] += preText.length;
                }

                str = str.replace(/\r\n?/g, "\n");
                // Remove potential UTF Byte Order Mark
                str = preText + str.replace(/^\uFEFF/, "") + modifyVars;
                imports.contents[fileInfo.filename] = str;

                // Start with the primary rule.
                // The whole syntax tree is held under a Ruleset node,
                // with the `root` property set to true, so no `{}` are
                // output. The callback is called when the input is parsed.
                try {
                  parserInput.start(str, context.chunkInput, function fail(
                    msg,
                    index
                  ) {
                    throw new LessError(
                      {
                        index: index,
                        type: "Parse",
                        message: msg,
                        filename: fileInfo.filename
                      },
                      imports
                    );
                  });

                  root = new tree.Ruleset(null, this.parsers.primary());
                  root.root = true;
                  root.firstRoot = true;
                } catch (e) {
                  return callback(new LessError(e, imports, fileInfo.filename));
                }

                // If `i` is smaller than the `input.length - 1`,
                // it means the parser wasn't able to parse the whole
                // string, so we've got a parsing error.
                //
                // We try to extract a \n delimited string,
                // showing the line where the parse error occurred.
                // We split it up into two parts (the part which parsed,
                // and the part which didn't), so we can color them differently.
                var endInfo = parserInput.end();
                if (!endInfo.isFinished) {
                  var message = endInfo.furthestPossibleErrorMessage;

                  if (!message) {
                    message = "Unrecognised input";
                    if (endInfo.furthestChar === "}") {
                      message += ". Possibly missing opening '{'";
                    } else if (endInfo.furthestChar === ")") {
                      message += ". Possibly missing opening '('";
                    } else if (endInfo.furthestReachedEnd) {
                      message += ". Possibly missing something";
                    }
                  }

                  error = new LessError(
                    {
                      type: "Parse",
                      message: message,
                      index: endInfo.furthest,
                      filename: fileInfo.filename
                    },
                    imports
                  );
                }

                var finish = function(e) {
                  e = error || e || imports.error;

                  if (e) {
                    if (!(e instanceof LessError)) {
                      e = new LessError(e, imports, fileInfo.filename);
                    }

                    return callback(e);
                  } else {
                    return callback(null, root);
                  }
                };

                if (context.processImports !== false) {
                  new visitors.ImportVisitor(imports, finish).run(root);
                } else {
                  return finish();
                }
              },

              //
              // Here in, the parsing rules/functions
              //
              // The basic structure of the syntax tree generated is as follows:
              //
              //   Ruleset ->  Rule -> Value -> Expression -> Entity
              //
              // Here's some Less code:
              //
              //    .class {
              //      color: #fff;
              //      border: 1px solid #000;
              //      width: @w + 4px;
              //      > .child {...}
              //    }
              //
              // And here's what the parse tree might look like:
              //
              //     Ruleset (Selector '.class', [
              //         Rule ("color",  Value ([Expression [Color #fff]]))
              //         Rule ("border", Value ([Expression [Dimension 1px][Keyword "solid"][Color #000]]))
              //         Rule ("width",  Value ([Expression [Operation " + " [Variable "@w"][Dimension 4px]]]))
              //         Ruleset (Selector [Element '>', '.child'], [...])
              //     ])
              //
              //  In general, most rules will try to parse a token with the `$re()` function, and if the return
              //  value is truly, will return a new node, of the relevant type. Sometimes, we need to check
              //  first, before parsing, that's when we use `peek()`.
              //
              parsers: (parsers = {
                //
                // The `primary` rule is the *entry* and *exit* point of the parser.
                // The rules here can appear at any level of the parse tree.
                //
                // The recursive nature of the grammar is an interplay between the `block`
                // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,
                // as represented by this simplified grammar:
                //
                //     primary  →  (ruleset | rule)+
                //     ruleset  →  selector+ block
                //     block    →  '{' primary '}'
                //
                // Only at one point is the primary rule not called from the
                // block rule: at the root level.
                //
                primary: function() {
                  var mixin = this.mixin,
                    root = [],
                    node;

                  while (true) {
                    while (true) {
                      node = this.comment();
                      if (!node) {
                        break;
                      }
                      root.push(node);
                    }
                    // always process comments before deciding if finished
                    if (parserInput.finished) {
                      break;
                    }
                    if (parserInput.peek("}")) {
                      break;
                    }

                    node = this.extendRule();
                    if (node) {
                      root = root.concat(node);
                      continue;
                    }

                    node =
                      mixin.definition() ||
                      this.rule() ||
                      this.ruleset() ||
                      mixin.call() ||
                      this.rulesetCall() ||
                      this.entities.call() ||
                      this.directive();
                    if (node) {
                      root.push(node);
                    } else {
                      var foundSemiColon = false;
                      while (parserInput.$char(";")) {
                        foundSemiColon = true;
                      }
                      if (!foundSemiColon) {
                        break;
                      }
                    }
                  }

                  return root;
                },

                // comments are collected by the main parsing mechanism and then assigned to nodes
                // where the current structure allows it
                comment: function() {
                  if (parserInput.commentStore.length) {
                    var comment = parserInput.commentStore.shift();
                    return new tree.Comment(
                      comment.text,
                      comment.isLineComment,
                      comment.index,
                      fileInfo
                    );
                  }
                },

                //
                // Entities are tokens which can be found inside an Expression
                //
                entities: {
                  //
                  // A string, which supports escaping " and '
                  //
                  //     "milky way" 'he\'s the one!'
                  //
                  quoted: function() {
                    var str,
                      index = parserInput.i,
                      isEscaped = false;

                    parserInput.save();
                    if (parserInput.$char("~")) {
                      isEscaped = true;
                    }
                    str = parserInput.$quoted();
                    if (!str) {
                      parserInput.restore();
                      return;
                    }
                    parserInput.forget();

                    return new tree.Quoted(
                      str.charAt(0),
                      str.substr(1, str.length - 2),
                      isEscaped,
                      index,
                      fileInfo
                    );
                  },

                  //
                  // A catch-all word, such as:
                  //
                  //     black border-collapse
                  //
                  keyword: function() {
                    var k =
                      parserInput.$char("%") ||
                      parserInput.$re(/^[_A-Za-z-][_A-Za-z0-9-]*/);
                    if (k) {
                      return tree.Color.fromKeyword(k) || new tree.Keyword(k);
                    }
                  },

                  //
                  // A function call
                  //
                  //     rgb(255, 0, 255)
                  //
                  // We also try to catch IE's `alpha()`, but let the `alpha` parser
                  // deal with the details.
                  //
                  // The arguments are parsed with the `entities.arguments` parser.
                  //
                  call: function() {
                    var name,
                      nameLC,
                      args,
                      alpha,
                      index = parserInput.i;

                    // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18
                    if (parserInput.peek(/^url\(/i)) {
                      return;
                    }

                    parserInput.save();

                    name = parserInput.$re(/^([\w-]+|%|progid:[\w\.]+)\(/);
                    if (!name) {
                      parserInput.forget();
                      return;
                    }

                    name = name[1];
                    nameLC = name.toLowerCase();

                    if (nameLC === "alpha") {
                      alpha = parsers.alpha();
                      if (alpha) {
                        parserInput.forget();
                        return alpha;
                      }
                    }

                    args = this.arguments();

                    if (!parserInput.$char(")")) {
                      parserInput.restore(
                        "Could not parse call arguments or missing ')'"
                      );
                      return;
                    }

                    parserInput.forget();
                    return new tree.Call(name, args, index, fileInfo);
                  },
                  arguments: function() {
                    var argsSemiColon = [],
                      argsComma = [],
                      expressions = [],
                      isSemiColonSeparated,
                      value,
                      arg;

                    parserInput.save();

                    while (true) {
                      arg =
                        parsers.detachedRuleset() ||
                        this.assignment() ||
                        parsers.expression();

                      if (!arg) {
                        break;
                      }

                      value = arg;

                      if (arg.value && arg.value.length == 1) {
                        value = arg.value[0];
                      }

                      if (value) {
                        expressions.push(value);
                      }

                      argsComma.push(value);

                      if (parserInput.$char(",")) {
                        continue;
                      }

                      if (parserInput.$char(";") || isSemiColonSeparated) {
                        isSemiColonSeparated = true;

                        if (expressions.length > 1) {
                          value = new tree.Value(expressions);
                        }
                        argsSemiColon.push(value);

                        expressions = [];
                      }
                    }

                    parserInput.forget();
                    return isSemiColonSeparated ? argsSemiColon : argsComma;
                  },
                  literal: function() {
                    return (
                      this.dimension() ||
                      this.color() ||
                      this.quoted() ||
                      this.unicodeDescriptor()
                    );
                  },

                  // Assignments are argument entities for calls.
                  // They are present in ie filter properties as shown below.
                  //
                  //     filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )
                  //

                  assignment: function() {
                    var key, value;
                    parserInput.save();
                    key = parserInput.$re(/^\w+(?=\s?=)/i);
                    if (!key) {
                      parserInput.restore();
                      return;
                    }
                    if (!parserInput.$char("=")) {
                      parserInput.restore();
                      return;
                    }
                    value = parsers.entity();
                    if (value) {
                      parserInput.forget();
                      return new tree.Assignment(key, value);
                    } else {
                      parserInput.restore();
                    }
                  },

                  //
                  // Parse url() tokens
                  //
                  // We use a specific rule for urls, because they don't really behave like
                  // standard function calls. The difference is that the argument doesn't have
                  // to be enclosed within a string, so it can't be parsed as an Expression.
                  //
                  url: function() {
                    var value,
                      index = parserInput.i;

                    parserInput.autoCommentAbsorb = false;

                    if (!parserInput.$str("url(")) {
                      parserInput.autoCommentAbsorb = true;
                      return;
                    }

                    value =
                      this.quoted() ||
                      this.variable() ||
                      parserInput.$re(/^(?:(?:\\[\(\)'"])|[^\(\)'"])+/) ||
                      "";

                    parserInput.autoCommentAbsorb = true;

                    expectChar(")");

                    return new tree.URL(
                      value.value != null || value instanceof tree.Variable
                        ? value
                        : new tree.Anonymous(value),
                      index,
                      fileInfo
                    );
                  },

                  //
                  // A Variable entity, such as `@fink`, in
                  //
                  //     width: @fink + 2px
                  //
                  // We use a different parser for variable definitions,
                  // see `parsers.variable`.
                  //
                  variable: function() {
                    var name,
                      index = parserInput.i;

                    if (
                      parserInput.currentChar() === "@" &&
                      (name = parserInput.$re(/^@@?[\w-]+/))
                    ) {
                      return new tree.Variable(name, index, fileInfo);
                    }
                  },

                  // A variable entity using the protective {} e.g. @{var}
                  variableCurly: function() {
                    var curly,
                      index = parserInput.i;

                    if (
                      parserInput.currentChar() === "@" &&
                      (curly = parserInput.$re(/^@\{([\w-]+)\}/))
                    ) {
                      return new tree.Variable("@" + curly[1], index, fileInfo);
                    }
                  },

                  //
                  // A Hexadecimal color
                  //
                  //     #4F3C2F
                  //
                  // `rgb` and `hsl` colors are parsed through the `entities.call` parser.
                  //
                  color: function() {
                    var rgb;

                    if (
                      parserInput.currentChar() === "#" &&
                      (rgb = parserInput.$re(
                        /^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/
                      ))
                    ) {
                      // strip colons, brackets, whitespaces and other characters that should not
                      // definitely be part of color string
                      var colorCandidateString = rgb.input.match(/^#([\w]+).*/);
                      colorCandidateString = colorCandidateString[1];
                      if (!colorCandidateString.match(/^[A-Fa-f0-9]+$/)) {
                        // verify if candidate consists only of allowed HEX characters
                        error("Invalid HEX color code");
                      }
                      return new tree.Color(
                        rgb[1],
                        undefined,
                        "#" + colorCandidateString
                      );
                    }
                  },

                  colorKeyword: function() {
                    parserInput.save();
                    var autoCommentAbsorb = parserInput.autoCommentAbsorb;
                    parserInput.autoCommentAbsorb = false;
                    var k = parserInput.$re(/^[_A-Za-z-][_A-Za-z0-9-]+/);
                    parserInput.autoCommentAbsorb = autoCommentAbsorb;
                    if (!k) {
                      parserInput.forget();
                      return;
                    }
                    parserInput.restore();
                    var color = tree.Color.fromKeyword(k);
                    if (color) {
                      parserInput.$str(k);
                      return color;
                    }
                  },

                  //
                  // A Dimension, that is, a number and a unit
                  //
                  //     0.5em 95%
                  //
                  dimension: function() {
                    if (parserInput.peekNotNumeric()) {
                      return;
                    }

                    var value = parserInput.$re(
                      /^([+-]?\d*\.?\d+)(%|[a-z_]+)?/i
                    );
                    if (value) {
                      return new tree.Dimension(value[1], value[2]);
                    }
                  },

                  //
                  // A unicode descriptor, as is used in unicode-range
                  //
                  // U+0??  or U+00A1-00A9
                  //
                  unicodeDescriptor: function() {
                    var ud;

                    ud = parserInput.$re(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/);
                    if (ud) {
                      return new tree.UnicodeDescriptor(ud[0]);
                    }
                  },

                  //
                  // JavaScript code to be evaluated
                  //
                  //     `window.location.href`
                  //
                  javascript: function() {
                    var js,
                      index = parserInput.i;

                    parserInput.save();

                    var escape = parserInput.$char("~");
                    var jsQuote = parserInput.$char("`");

                    if (!jsQuote) {
                      parserInput.restore();
                      return;
                    }

                    js = parserInput.$re(/^[^`]*`/);
                    if (js) {
                      parserInput.forget();
                      return new tree.JavaScript(
                        js.substr(0, js.length - 1),
                        Boolean(escape),
                        index,
                        fileInfo
                      );
                    }
                    parserInput.restore("invalid javascript definition");
                  }
                },

                //
                // The variable part of a variable definition. Used in the `rule` parser
                //
                //     @fink:
                //
                variable: function() {
                  var name;

                  if (
                    parserInput.currentChar() === "@" &&
                    (name = parserInput.$re(/^(@[\w-]+)\s*:/))
                  ) {
                    return name[1];
                  }
                },

                //
                // The variable part of a variable definition. Used in the `rule` parser
                //
                //     @fink();
                //
                rulesetCall: function() {
                  var name;

                  if (
                    parserInput.currentChar() === "@" &&
                    (name = parserInput.$re(/^(@[\w-]+)\(\s*\)\s*;/))
                  ) {
                    return new tree.RulesetCall(name[1]);
                  }
                },

                //
                // extend syntax - used to extend selectors
                //
                extend: function(isRule) {
                  var elements,
                    e,
                    index = parserInput.i,
                    option,
                    extendList,
                    extend;

                  if (!parserInput.$str(isRule ? "&:extend(" : ":extend(")) {
                    return;
                  }

                  do {
                    option = null;
                    elements = null;
                    while (!(option = parserInput.$re(/^(all)(?=\s*(\)|,))/))) {
                      e = this.element();
                      if (!e) {
                        break;
                      }
                      if (elements) {
                        elements.push(e);
                      } else {
                        elements = [e];
                      }
                    }

                    option = option && option[1];
                    if (!elements) {
                      error("Missing target selector for :extend().");
                    }
                    extend = new tree.Extend(
                      new tree.Selector(elements),
                      option,
                      index,
                      fileInfo
                    );
                    if (extendList) {
                      extendList.push(extend);
                    } else {
                      extendList = [extend];
                    }
                  } while (parserInput.$char(","));

                  expect(/^\)/);

                  if (isRule) {
                    expect(/^;/);
                  }

                  return extendList;
                },

                //
                // extendRule - used in a rule to extend all the parent selectors
                //
                extendRule: function() {
                  return this.extend(true);
                },

                //
                // Mixins
                //
                mixin: {
                  //
                  // A Mixin call, with an optional argument list
                  //
                  //     #mixins > .square(#fff);
                  //     .rounded(4px, black);
                  //     .button;
                  //
                  // The `while` loop is there because mixins can be
                  // namespaced, but we only support the child and descendant
                  // selector for now.
                  //
                  call: function() {
                    var s = parserInput.currentChar(),
                      important = false,
                      index = parserInput.i,
                      elemIndex,
                      elements,
                      elem,
                      e,
                      c,
                      args;

                    if (s !== "." && s !== "#") {
                      return;
                    }

                    parserInput.save(); // stop us absorbing part of an invalid selector

                    while (true) {
                      elemIndex = parserInput.i;
                      e = parserInput.$re(
                        /^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/
                      );
                      if (!e) {
                        break;
                      }
                      elem = new tree.Element(c, e, elemIndex, fileInfo);
                      if (elements) {
                        elements.push(elem);
                      } else {
                        elements = [elem];
                      }
                      c = parserInput.$char(">");
                    }

                    if (elements) {
                      if (parserInput.$char("(")) {
                        args = this.args(true).args;
                        expectChar(")");
                      }

                      if (parsers.important()) {
                        important = true;
                      }

                      if (parsers.end()) {
                        parserInput.forget();
                        return new tree.mixin.Call(
                          elements,
                          args,
                          index,
                          fileInfo,
                          important
                        );
                      }
                    }

                    parserInput.restore();
                  },
                  args: function(isCall) {
                    var entities = parsers.entities,
                      returner = { args: null, variadic: false },
                      expressions = [],
                      argsSemiColon = [],
                      argsComma = [],
                      isSemiColonSeparated,
                      expressionContainsNamed,
                      name,
                      nameLoop,
                      value,
                      arg,
                      expand;

                    parserInput.save();

                    while (true) {
                      if (isCall) {
                        arg = parsers.detachedRuleset() || parsers.expression();
                      } else {
                        parserInput.commentStore.length = 0;
                        if (parserInput.$str("...")) {
                          returner.variadic = true;
                          if (parserInput.$char(";") && !isSemiColonSeparated) {
                            isSemiColonSeparated = true;
                          }
                          (isSemiColonSeparated
                            ? argsSemiColon
                            : argsComma
                          ).push({ variadic: true });
                          break;
                        }
                        arg =
                          entities.variable() ||
                          entities.literal() ||
                          entities.keyword();
                      }

                      if (!arg) {
                        break;
                      }

                      nameLoop = null;
                      if (arg.throwAwayComments) {
                        arg.throwAwayComments();
                      }
                      value = arg;
                      var val = null;

                      if (isCall) {
                        // Variable
                        if (arg.value && arg.value.length == 1) {
                          val = arg.value[0];
                        }
                      } else {
                        val = arg;
                      }

                      if (val && val instanceof tree.Variable) {
                        if (parserInput.$char(":")) {
                          if (expressions.length > 0) {
                            if (isSemiColonSeparated) {
                              error("Cannot mix ; and , as delimiter types");
                            }
                            expressionContainsNamed = true;
                          }

                          value =
                            parsers.detachedRuleset() || parsers.expression();

                          if (!value) {
                            if (isCall) {
                              error(
                                "could not understand value for named argument"
                              );
                            } else {
                              parserInput.restore();
                              returner.args = [];
                              return returner;
                            }
                          }
                          nameLoop = name = val.name;
                        } else if (parserInput.$str("...")) {
                          if (!isCall) {
                            returner.variadic = true;
                            if (
                              parserInput.$char(";") &&
                              !isSemiColonSeparated
                            ) {
                              isSemiColonSeparated = true;
                            }
                            (isSemiColonSeparated
                              ? argsSemiColon
                              : argsComma
                            ).push({ name: arg.name, variadic: true });
                            break;
                          } else {
                            expand = true;
                          }
                        } else if (!isCall) {
                          name = nameLoop = val.name;
                          value = null;
                        }
                      }

                      if (value) {
                        expressions.push(value);
                      }

                      argsComma.push({
                        name: nameLoop,
                        value: value,
                        expand: expand
                      });

                      if (parserInput.$char(",")) {
                        continue;
                      }

                      if (parserInput.$char(";") || isSemiColonSeparated) {
                        if (expressionContainsNamed) {
                          error("Cannot mix ; and , as delimiter types");
                        }

                        isSemiColonSeparated = true;

                        if (expressions.length > 1) {
                          value = new tree.Value(expressions);
                        }
                        argsSemiColon.push({
                          name: name,
                          value: value,
                          expand: expand
                        });

                        name = null;
                        expressions = [];
                        expressionContainsNamed = false;
                      }
                    }

                    parserInput.forget();
                    returner.args = isSemiColonSeparated
                      ? argsSemiColon
                      : argsComma;
                    return returner;
                  },
                  //
                  // A Mixin definition, with a list of parameters
                  //
                  //     .rounded (@radius: 2px, @color) {
                  //        ...
                  //     }
                  //
                  // Until we have a finer grained state-machine, we have to
                  // do a look-ahead, to make sure we don't have a mixin call.
                  // See the `rule` function for more information.
                  //
                  // We start by matching `.rounded (`, and then proceed on to
                  // the argument list, which has optional default values.
                  // We store the parameters in `params`, with a `value` key,
                  // if there is a value, such as in the case of `@radius`.
                  //
                  // Once we've got our params list, and a closing `)`, we parse
                  // the `{...}` block.
                  //
                  definition: function() {
                    var name,
                      params = [],
                      match,
                      ruleset,
                      cond,
                      variadic = false;
                    if (
                      (parserInput.currentChar() !== "." &&
                        parserInput.currentChar() !== "#") ||
                      parserInput.peek(/^[^{]*\}/)
                    ) {
                      return;
                    }

                    parserInput.save();

                    match = parserInput.$re(
                      /^([#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\s*\(/
                    );
                    if (match) {
                      name = match[1];

                      var argInfo = this.args(false);
                      params = argInfo.args;
                      variadic = argInfo.variadic;

                      // .mixincall("@{a}");
                      // looks a bit like a mixin definition..
                      // also
                      // .mixincall(@a: {rule: set;});
                      // so we have to be nice and restore
                      if (!parserInput.$char(")")) {
                        parserInput.restore("Missing closing ')'");
                        return;
                      }

                      parserInput.commentStore.length = 0;

                      if (parserInput.$str("when")) {
                        // Guard
                        cond = expect(parsers.conditions, "expected condition");
                      }

                      ruleset = parsers.block();

                      if (ruleset) {
                        parserInput.forget();
                        return new tree.mixin.Definition(
                          name,
                          params,
                          ruleset,
                          cond,
                          variadic
                        );
                      } else {
                        parserInput.restore();
                      }
                    } else {
                      parserInput.forget();
                    }
                  }
                },

                //
                // Entities are the smallest recognized token,
                // and can be found inside a rule's value.
                //
                entity: function() {
                  var entities = this.entities;

                  return (
                    this.comment() ||
                    entities.literal() ||
                    entities.variable() ||
                    entities.url() ||
                    entities.call() ||
                    entities.keyword() ||
                    entities.javascript()
                  );
                },

                //
                // A Rule terminator. Note that we use `peek()` to check for '}',
                // because the `block` rule will be expecting it, but we still need to make sure
                // it's there, if ';' was omitted.
                //
                end: function() {
                  return parserInput.$char(";") || parserInput.peek("}");
                },

                //
                // IE's alpha function
                //
                //     alpha(opacity=88)
                //
                alpha: function() {
                  var value;

                  // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18
                  if (!parserInput.$re(/^opacity=/i)) {
                    return;
                  }
                  value = parserInput.$re(/^\d+/);
                  if (!value) {
                    value = expect(
                      this.entities.variable,
                      "Could not parse alpha"
                    );
                  }
                  expectChar(")");
                  return new tree.Alpha(value);
                },

                //
                // A Selector Element
                //
                //     div
                //     + h1
                //     #socks
                //     input[type="text"]
                //
                // Elements are the building blocks for Selectors,
                // they are made out of a `Combinator` (see combinator rule),
                // and an element name, such as a tag a class, or `*`.
                //
                element: function() {
                  var e,
                    c,
                    v,
                    index = parserInput.i;

                  c = this.combinator();

                  e =
                    parserInput.$re(/^(?:\d+\.\d+|\d+)%/) ||
                    parserInput.$re(
                      /^(?:[.#]?|:*)(?:[\w-]|[^\x00-\x9f]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/
                    ) ||
                    parserInput.$char("*") ||
                    parserInput.$char("&") ||
                    this.attribute() ||
                    parserInput.$re(/^\([^&()@]+\)/) ||
                    parserInput.$re(/^[\.#:](?=@)/) ||
                    this.entities.variableCurly();

                  if (!e) {
                    parserInput.save();
                    if (parserInput.$char("(")) {
                      if ((v = this.selector()) && parserInput.$char(")")) {
                        e = new tree.Paren(v);
                        parserInput.forget();
                      } else {
                        parserInput.restore("Missing closing ')'");
                      }
                    } else {
                      parserInput.forget();
                    }
                  }

                  if (e) {
                    return new tree.Element(c, e, index, fileInfo);
                  }
                },

                //
                // Combinators combine elements together, in a Selector.
                //
                // Because our parser isn't white-space sensitive, special care
                // has to be taken, when parsing the descendant combinator, ` `,
                // as it's an empty space. We have to check the previous character
                // in the input, to see if it's a ` ` character. More info on how
                // we deal with this in *combinator.js*.
                //
                combinator: function() {
                  var c = parserInput.currentChar();

                  if (c === "/") {
                    parserInput.save();
                    var slashedCombinator = parserInput.$re(/^\/[a-z]+\//i);
                    if (slashedCombinator) {
                      parserInput.forget();
                      return new tree.Combinator(slashedCombinator);
                    }
                    parserInput.restore();
                  }

                  if (
                    c === ">" ||
                    c === "+" ||
                    c === "~" ||
                    c === "|" ||
                    c === "^"
                  ) {
                    parserInput.i++;
                    if (c === "^" && parserInput.currentChar() === "^") {
                      c = "^^";
                      parserInput.i++;
                    }
                    while (parserInput.isWhitespace()) {
                      parserInput.i++;
                    }
                    return new tree.Combinator(c);
                  } else if (parserInput.isWhitespace(-1)) {
                    return new tree.Combinator(" ");
                  } else {
                    return new tree.Combinator(null);
                  }
                },
                //
                // A CSS selector (see selector below)
                // with less extensions e.g. the ability to extend and guard
                //
                lessSelector: function() {
                  return this.selector(true);
                },
                //
                // A CSS Selector
                //
                //     .class > div + h1
                //     li a:hover
                //
                // Selectors are made out of one or more Elements, see above.
                //
                selector: function(isLess) {
                  var index = parserInput.i,
                    elements,
                    extendList,
                    c,
                    e,
                    allExtends,
                    when,
                    condition;

                  while (
                    (isLess && (extendList = this.extend())) ||
                    (isLess && (when = parserInput.$str("when"))) ||
                    (e = this.element())
                  ) {
                    if (when) {
                      condition = expect(this.conditions, "expected condition");
                    } else if (condition) {
                      error(
                        "CSS guard can only be used at the end of selector"
                      );
                    } else if (extendList) {
                      if (allExtends) {
                        allExtends = allExtends.concat(extendList);
                      } else {
                        allExtends = extendList;
                      }
                    } else {
                      if (allExtends) {
                        error("Extend can only be used at the end of selector");
                      }
                      c = parserInput.currentChar();
                      if (elements) {
                        elements.push(e);
                      } else {
                        elements = [e];
                      }
                      e = null;
                    }
                    if (
                      c === "{" ||
                      c === "}" ||
                      c === ";" ||
                      c === "," ||
                      c === ")"
                    ) {
                      break;
                    }
                  }

                  if (elements) {
                    return new tree.Selector(
                      elements,
                      allExtends,
                      condition,
                      index,
                      fileInfo
                    );
                  }
                  if (allExtends) {
                    error(
                      "Extend must be used to extend a selector, it cannot be used on its own"
                    );
                  }
                },
                attribute: function() {
                  if (!parserInput.$char("[")) {
                    return;
                  }

                  var entities = this.entities,
                    key,
                    val,
                    op;

                  if (!(key = entities.variableCurly())) {
                    key = expect(
                      /^(?:[_A-Za-z0-9-\*]*\|)?(?:[_A-Za-z0-9-]|\\.)+/
                    );
                  }

                  op = parserInput.$re(/^[|~*$^]?=/);
                  if (op) {
                    val =
                      entities.quoted() ||
                      parserInput.$re(/^[0-9]+%/) ||
                      parserInput.$re(/^[\w-]+/) ||
                      entities.variableCurly();
                  }

                  expectChar("]");

                  return new tree.Attribute(key, op, val);
                },

                //
                // The `block` rule is used by `ruleset` and `mixin.definition`.
                // It's a wrapper around the `primary` rule, with added `{}`.
                //
                block: function() {
                  var content;
                  if (
                    parserInput.$char("{") &&
                    (content = this.primary()) &&
                    parserInput.$char("}")
                  ) {
                    return content;
                  }
                },

                blockRuleset: function() {
                  var block = this.block();

                  if (block) {
                    block = new tree.Ruleset(null, block);
                  }
                  return block;
                },

                detachedRuleset: function() {
                  var blockRuleset = this.blockRuleset();
                  if (blockRuleset) {
                    return new tree.DetachedRuleset(blockRuleset);
                  }
                },

                //
                // div, .class, body > p {...}
                //
                ruleset: function() {
                  var selectors, s, rules, debugInfo;

                  parserInput.save();

                  if (context.dumpLineNumbers) {
                    debugInfo = getDebugInfo(parserInput.i);
                  }

                  while (true) {
                    s = this.lessSelector();
                    if (!s) {
                      break;
                    }
                    if (selectors) {
                      selectors.push(s);
                    } else {
                      selectors = [s];
                    }
                    parserInput.commentStore.length = 0;
                    if (s.condition && selectors.length > 1) {
                      error(
                        "Guards are only currently allowed on a single selector."
                      );
                    }
                    if (!parserInput.$char(",")) {
                      break;
                    }
                    if (s.condition) {
                      error(
                        "Guards are only currently allowed on a single selector."
                      );
                    }
                    parserInput.commentStore.length = 0;
                  }

                  if (selectors && (rules = this.block())) {
                    parserInput.forget();
                    var ruleset = new tree.Ruleset(
                      selectors,
                      rules,
                      context.strictImports
                    );
                    if (context.dumpLineNumbers) {
                      ruleset.debugInfo = debugInfo;
                    }
                    return ruleset;
                  } else {
                    parserInput.restore();
                  }
                },
                rule: function(tryAnonymous) {
                  var name,
                    value,
                    startOfRule = parserInput.i,
                    c = parserInput.currentChar(),
                    important,
                    merge,
                    isVariable;

                  if (c === "." || c === "#" || c === "&" || c === ":") {
                    return;
                  }

                  parserInput.save();

                  name = this.variable() || this.ruleProperty();
                  if (name) {
                    isVariable = typeof name === "string";

                    if (isVariable) {
                      value = this.detachedRuleset();
                    }

                    parserInput.commentStore.length = 0;
                    if (!value) {
                      // a name returned by this.ruleProperty() is always an array of the form:
                      // [string-1, ..., string-n, ""] or [string-1, ..., string-n, "+"]
                      // where each item is a tree.Keyword or tree.Variable
                      merge =
                        !isVariable && name.length > 1 && name.pop().value;

                      // prefer to try to parse first if its a variable or we are compressing
                      // but always fallback on the other one
                      var tryValueFirst =
                        !tryAnonymous && (context.compress || isVariable);

                      if (tryValueFirst) {
                        value = this.value();
                      }
                      if (!value) {
                        value = this.anonymousValue();
                        if (value) {
                          parserInput.forget();
                          // anonymous values absorb the end ';' which is required for them to work
                          return new tree.Rule(
                            name,
                            value,
                            false,
                            merge,
                            startOfRule,
                            fileInfo
                          );
                        }
                      }
                      if (!tryValueFirst && !value) {
                        value = this.value();
                      }

                      important = this.important();
                    }

                    if (value && this.end()) {
                      parserInput.forget();
                      return new tree.Rule(
                        name,
                        value,
                        important,
                        merge,
                        startOfRule,
                        fileInfo
                      );
                    } else {
                      parserInput.restore();
                      if (value && !tryAnonymous) {
                        return this.rule(true);
                      }
                    }
                  } else {
                    parserInput.forget();
                  }
                },
                anonymousValue: function() {
                  var match = parserInput.$re(/^([^@+\/'"*`(;{}-]*);/);
                  if (match) {
                    return new tree.Anonymous(match[1]);
                  }
                },

                //
                // An @import directive
                //
                //     @import "lib";
                //
                // Depending on our environment, importing is done differently:
                // In the browser, it's an XHR request, in Node, it would be a
                // file-system operation. The function used for importing is
                // stored in `import`, which we pass to the Import constructor.
                //
                import: function() {
                  var path,
                    features,
                    index = parserInput.i;

                  var dir = parserInput.$re(/^@import?\s+/);

                  if (dir) {
                    var options = (dir ? this.importOptions() : null) || {};

                    if (
                      (path = this.entities.quoted() || this.entities.url())
                    ) {
                      features = this.mediaFeatures();

                      if (!parserInput.$char(";")) {
                        parserInput.i = index;
                        error(
                          "missing semi-colon or unrecognised media features on import"
                        );
                      }
                      features = features && new tree.Value(features);
                      return new tree.Import(
                        path,
                        features,
                        options,
                        index,
                        fileInfo
                      );
                    } else {
                      parserInput.i = index;
                      error("malformed import statement");
                    }
                  }
                },

                importOptions: function() {
                  var o,
                    options = {},
                    optionName,
                    value;

                  // list of options, surrounded by parens
                  if (!parserInput.$char("(")) {
                    return null;
                  }
                  do {
                    o = this.importOption();
                    if (o) {
                      optionName = o;
                      value = true;
                      switch (optionName) {
                        case "css":
                          optionName = "less";
                          value = false;
                          break;
                        case "once":
                          optionName = "multiple";
                          value = false;
                          break;
                      }
                      options[optionName] = value;
                      if (!parserInput.$char(",")) {
                        break;
                      }
                    }
                  } while (o);
                  expectChar(")");
                  return options;
                },

                importOption: function() {
                  var opt = parserInput.$re(
                    /^(less|css|multiple|once|inline|reference|optional)/
                  );
                  if (opt) {
                    return opt[1];
                  }
                },

                mediaFeature: function() {
                  var entities = this.entities,
                    nodes = [],
                    e,
                    p;
                  parserInput.save();
                  do {
                    e = entities.keyword() || entities.variable();
                    if (e) {
                      nodes.push(e);
                    } else if (parserInput.$char("(")) {
                      p = this.property();
                      e = this.value();
                      if (parserInput.$char(")")) {
                        if (p && e) {
                          nodes.push(
                            new tree.Paren(
                              new tree.Rule(
                                p,
                                e,
                                null,
                                null,
                                parserInput.i,
                                fileInfo,
                                true
                              )
                            )
                          );
                        } else if (e) {
                          nodes.push(new tree.Paren(e));
                        } else {
                          error("badly formed media feature definition");
                        }
                      } else {
                        error("Missing closing ')'", "Parse");
                      }
                    }
                  } while (e);

                  parserInput.forget();
                  if (nodes.length > 0) {
                    return new tree.Expression(nodes);
                  }
                },

                mediaFeatures: function() {
                  var entities = this.entities,
                    features = [],
                    e;
                  do {
                    e = this.mediaFeature();
                    if (e) {
                      features.push(e);
                      if (!parserInput.$char(",")) {
                        break;
                      }
                    } else {
                      e = entities.variable();
                      if (e) {
                        features.push(e);
                        if (!parserInput.$char(",")) {
                          break;
                        }
                      }
                    }
                  } while (e);

                  return features.length > 0 ? features : null;
                },

                media: function() {
                  var features,
                    rules,
                    media,
                    debugInfo,
                    index = parserInput.i;

                  if (context.dumpLineNumbers) {
                    debugInfo = getDebugInfo(index);
                  }

                  parserInput.save();

                  if (parserInput.$str("@media")) {
                    features = this.mediaFeatures();

                    rules = this.block();

                    if (!rules) {
                      error(
                        "media definitions require block statements after any features"
                      );
                    }

                    parserInput.forget();

                    media = new tree.Media(rules, features, index, fileInfo);
                    if (context.dumpLineNumbers) {
                      media.debugInfo = debugInfo;
                    }

                    return media;
                  }

                  parserInput.restore();
                },

                //
                // A @plugin directive, used to import compiler extensions dynamically.
                //
                //     @plugin "lib";
                //
                // Depending on our environment, importing is done differently:
                // In the browser, it's an XHR request, in Node, it would be a
                // file-system operation. The function used for importing is
                // stored in `import`, which we pass to the Import constructor.
                //
                plugin: function() {
                  var path,
                    index = parserInput.i,
                    dir = parserInput.$re(/^@plugin?\s+/);

                  if (dir) {
                    var options = { plugin: true };

                    if (
                      (path = this.entities.quoted() || this.entities.url())
                    ) {
                      if (!parserInput.$char(";")) {
                        parserInput.i = index;
                        error("missing semi-colon on plugin");
                      }

                      return new tree.Import(
                        path,
                        null,
                        options,
                        index,
                        fileInfo
                      );
                    } else {
                      parserInput.i = index;
                      error("malformed plugin statement");
                    }
                  }
                },

                //
                // A CSS Directive
                //
                //     @charset "utf-8";
                //
                directive: function() {
                  var index = parserInput.i,
                    name,
                    value,
                    rules,
                    nonVendorSpecificName,
                    hasIdentifier,
                    hasExpression,
                    hasUnknown,
                    hasBlock = true,
                    isRooted = true;

                  if (parserInput.currentChar() !== "@") {
                    return;
                  }

                  value = this["import"]() || this.plugin() || this.media();
                  if (value) {
                    return value;
                  }

                  parserInput.save();

                  name = parserInput.$re(/^@[a-z-]+/);

                  if (!name) {
                    return;
                  }

                  nonVendorSpecificName = name;
                  if (name.charAt(1) == "-" && name.indexOf("-", 2) > 0) {
                    nonVendorSpecificName =
                      "@" + name.slice(name.indexOf("-", 2) + 1);
                  }

                  switch (nonVendorSpecificName) {
                    case "@charset":
                      hasIdentifier = true;
                      hasBlock = false;
                      break;
                    case "@namespace":
                      hasExpression = true;
                      hasBlock = false;
                      break;
                    case "@keyframes":
                    case "@counter-style":
                      hasIdentifier = true;
                      break;
                    case "@document":
                    case "@supports":
                      hasUnknown = true;
                      isRooted = false;
                      break;
                    default:
                      hasUnknown = true;
                      break;
                  }

                  parserInput.commentStore.length = 0;

                  if (hasIdentifier) {
                    value = this.entity();
                    if (!value) {
                      error("expected " + name + " identifier");
                    }
                  } else if (hasExpression) {
                    value = this.expression();
                    if (!value) {
                      error("expected " + name + " expression");
                    }
                  } else if (hasUnknown) {
                    value = (parserInput.$re(/^[^{;]+/) || "").trim();
                    hasBlock = parserInput.currentChar() == "{";
                    if (value) {
                      value = new tree.Anonymous(value);
                    }
                  }

                  if (hasBlock) {
                    rules = this.blockRuleset();
                  }

                  if (rules || (!hasBlock && value && parserInput.$char(";"))) {
                    parserInput.forget();
                    return new tree.Directive(
                      name,
                      value,
                      rules,
                      index,
                      fileInfo,
                      context.dumpLineNumbers ? getDebugInfo(index) : null,
                      isRooted
                    );
                  }

                  parserInput.restore("directive options not recognised");
                },

                //
                // A Value is a comma-delimited list of Expressions
                //
                //     font-family: Baskerville, Georgia, serif;
                //
                // In a Rule, a Value represents everything after the `:`,
                // and before the `;`.
                //
                value: function() {
                  var e,
                    expressions = [];

                  do {
                    e = this.expression();
                    if (e) {
                      expressions.push(e);
                      if (!parserInput.$char(",")) {
                        break;
                      }
                    }
                  } while (e);

                  if (expressions.length > 0) {
                    return new tree.Value(expressions);
                  }
                },
                important: function() {
                  if (parserInput.currentChar() === "!") {
                    return parserInput.$re(/^! *important/);
                  }
                },
                sub: function() {
                  var a, e;

                  parserInput.save();
                  if (parserInput.$char("(")) {
                    a = this.addition();
                    if (a && parserInput.$char(")")) {
                      parserInput.forget();
                      e = new tree.Expression([a]);
                      e.parens = true;
                      return e;
                    }
                    parserInput.restore("Expected ')'");
                    return;
                  }
                  parserInput.restore();
                },
                multiplication: function() {
                  var m, a, op, operation, isSpaced;
                  m = this.operand();
                  if (m) {
                    isSpaced = parserInput.isWhitespace(-1);
                    while (true) {
                      if (parserInput.peek(/^\/[*\/]/)) {
                        break;
                      }

                      parserInput.save();

                      op = parserInput.$char("/") || parserInput.$char("*");

                      if (!op) {
                        parserInput.forget();
                        break;
                      }

                      a = this.operand();

                      if (!a) {
                        parserInput.restore();
                        break;
                      }
                      parserInput.forget();

                      m.parensInOp = true;
                      a.parensInOp = true;
                      operation = new tree.Operation(
                        op,
                        [operation || m, a],
                        isSpaced
                      );
                      isSpaced = parserInput.isWhitespace(-1);
                    }
                    return operation || m;
                  }
                },
                addition: function() {
                  var m, a, op, operation, isSpaced;
                  m = this.multiplication();
                  if (m) {
                    isSpaced = parserInput.isWhitespace(-1);
                    while (true) {
                      op =
                        parserInput.$re(/^[-+]\s+/) ||
                        (!isSpaced &&
                          (parserInput.$char("+") || parserInput.$char("-")));
                      if (!op) {
                        break;
                      }
                      a = this.multiplication();
                      if (!a) {
                        break;
                      }

                      m.parensInOp = true;
                      a.parensInOp = true;
                      operation = new tree.Operation(
                        op,
                        [operation || m, a],
                        isSpaced
                      );
                      isSpaced = parserInput.isWhitespace(-1);
                    }
                    return operation || m;
                  }
                },
                conditions: function() {
                  var a,
                    b,
                    index = parserInput.i,
                    condition;

                  a = this.condition();
                  if (a) {
                    while (true) {
                      if (
                        !parserInput.peek(/^,\s*(not\s*)?\(/) ||
                        !parserInput.$char(",")
                      ) {
                        break;
                      }
                      b = this.condition();
                      if (!b) {
                        break;
                      }
                      condition = new tree.Condition(
                        "or",
                        condition || a,
                        b,
                        index
                      );
                    }
                    return condition || a;
                  }
                },
                condition: function() {
                  var result, logical, next;

                  function or() {
                    return parserInput.$str("or");
                  }

                  result = this.conditionAnd(this);
                  if (!result) {
                    return;
                  }
                  logical = or();
                  if (logical) {
                    next = this.condition();
                    if (next) {
                      result = new tree.Condition(logical, result, next);
                    } else {
                      return;
                    }
                  }
                  return result;
                },
                conditionAnd: function() {
                  var result, logical, next;

                  function insideCondition(me) {
                    return me.negatedCondition() || me.parenthesisCondition();
                  }

                  function and() {
                    return parserInput.$str("and");
                  }

                  result = insideCondition(this);
                  if (!result) {
                    return;
                  }
                  logical = and();
                  if (logical) {
                    next = this.conditionAnd();
                    if (next) {
                      result = new tree.Condition(logical, result, next);
                    } else {
                      return;
                    }
                  }
                  return result;
                },
                negatedCondition: function() {
                  if (parserInput.$str("not")) {
                    var result = this.parenthesisCondition();
                    if (result) {
                      result.negate = !result.negate;
                    }
                    return result;
                  }
                },
                parenthesisCondition: function() {
                  function tryConditionFollowedByParenthesis(me) {
                    var body;
                    parserInput.save();
                    body = me.condition();
                    if (!body) {
                      parserInput.restore();
                      return;
                    }
                    if (!parserInput.$char(")")) {
                      parserInput.restore();
                      return;
                    }
                    parserInput.forget();
                    return body;
                  }

                  var body;
                  parserInput.save();
                  if (!parserInput.$str("(")) {
                    parserInput.restore();
                    return;
                  }
                  body = tryConditionFollowedByParenthesis(this);
                  if (body) {
                    parserInput.forget();
                    return body;
                  }

                  body = this.atomicCondition();
                  if (!body) {
                    parserInput.restore();
                    return;
                  }
                  if (!parserInput.$char(")")) {
                    parserInput.restore(
                      "expected ')' got '" + parserInput.currentChar() + "'"
                    );
                    return;
                  }
                  parserInput.forget();
                  return body;
                },
                atomicCondition: function() {
                  var entities = this.entities,
                    index = parserInput.i,
                    a,
                    b,
                    c,
                    op;

                  a =
                    this.addition() || entities.keyword() || entities.quoted();
                  if (a) {
                    if (parserInput.$char(">")) {
                      if (parserInput.$char("=")) {
                        op = ">=";
                      } else {
                        op = ">";
                      }
                    } else if (parserInput.$char("<")) {
                      if (parserInput.$char("=")) {
                        op = "<=";
                      } else {
                        op = "<";
                      }
                    } else if (parserInput.$char("=")) {
                      if (parserInput.$char(">")) {
                        op = "=>";
                      } else if (parserInput.$char("<")) {
                        op = "=<";
                      } else {
                        op = "=";
                      }
                    }
                    if (op) {
                      b =
                        this.addition() ||
                        entities.keyword() ||
                        entities.quoted();
                      if (b) {
                        c = new tree.Condition(op, a, b, index, false);
                      } else {
                        error("expected expression");
                      }
                    } else {
                      c = new tree.Condition(
                        "=",
                        a,
                        new tree.Keyword("true"),
                        index,
                        false
                      );
                    }
                    return c;
                  }
                },

                //
                // An operand is anything that can be part of an operation,
                // such as a Color, or a Variable
                //
                operand: function() {
                  var entities = this.entities,
                    negate;

                  if (parserInput.peek(/^-[@\(]/)) {
                    negate = parserInput.$char("-");
                  }

                  var o =
                    this.sub() ||
                    entities.dimension() ||
                    entities.color() ||
                    entities.variable() ||
                    entities.call() ||
                    entities.colorKeyword();

                  if (negate) {
                    o.parensInOp = true;
                    o = new tree.Negative(o);
                  }

                  return o;
                },

                //
                // Expressions either represent mathematical operations,
                // or white-space delimited Entities.
                //
                //     1px solid black
                //     @var * 2
                //
                expression: function() {
                  var entities = [],
                    e,
                    delim;

                  do {
                    e = this.comment();
                    if (e) {
                      entities.push(e);
                      continue;
                    }
                    e = this.addition() || this.entity();
                    if (e) {
                      entities.push(e);
                      // operations do not allow keyword "/" dimension (e.g. small/20px) so we support that here
                      if (!parserInput.peek(/^\/[\/*]/)) {
                        delim = parserInput.$char("/");
                        if (delim) {
                          entities.push(new tree.Anonymous(delim));
                        }
                      }
                    }
                  } while (e);
                  if (entities.length > 0) {
                    return new tree.Expression(entities);
                  }
                },
                property: function() {
                  var name = parserInput.$re(/^(\*?-?[_a-zA-Z0-9-]+)\s*:/);
                  if (name) {
                    return name[1];
                  }
                },
                ruleProperty: function() {
                  var name = [],
                    index = [],
                    s,
                    k;

                  parserInput.save();

                  var simpleProperty = parserInput.$re(/^([_a-zA-Z0-9-]+)\s*:/);
                  if (simpleProperty) {
                    name = [new tree.Keyword(simpleProperty[1])];
                    parserInput.forget();
                    return name;
                  }

                  function match(re) {
                    var i = parserInput.i,
                      chunk = parserInput.$re(re);
                    if (chunk) {
                      index.push(i);
                      return name.push(chunk[1]);
                    }
                  }

                  match(/^(\*?)/);
                  while (true) {
                    if (!match(/^((?:[\w-]+)|(?:@\{[\w-]+\}))/)) {
                      break;
                    }
                  }

                  if (name.length > 1 && match(/^((?:\+_|\+)?)\s*:/)) {
                    parserInput.forget();

                    // at last, we have the complete match now. move forward,
                    // convert name particles to tree objects and return:
                    if (name[0] === "") {
                      name.shift();
                      index.shift();
                    }
                    for (k = 0; k < name.length; k++) {
                      s = name[k];
                      name[k] =
                        s.charAt(0) !== "@"
                          ? new tree.Keyword(s)
                          : new tree.Variable(
                              "@" + s.slice(2, -1),
                              index[k],
                              fileInfo
                            );
                    }
                    return name;
                  }
                  parserInput.restore();
                }
              })
            };
          };
          Parser.serializeVars = function(vars) {
            var s = "";

            for (var name in vars) {
              if (Object.hasOwnProperty.call(vars, name)) {
                var value = vars[name];
                s +=
                  (name[0] === "@" ? "" : "@") +
                  name +
                  ": " +
                  value +
                  (String(value).slice(-1) === ";" ? "" : ";");
              }
            }

            return s;
          };

          module.exports = Parser;
        },
        {
          "../less-error": 32,
          "../tree": 62,
          "../utils": 83,
          "../visitors": 87,
          "./parser-input": 37
        }
      ],
      39: [
        function(require, module, exports) {
          /**
           * Plugin Manager
           */
          var PluginManager = function(less) {
            this.less = less;
            this.visitors = [];
            this.preProcessors = [];
            this.postProcessors = [];
            this.installedPlugins = [];
            this.fileManagers = [];
          };
          /**
           * Adds all the plugins in the array
           * @param {Array} plugins
           */
          PluginManager.prototype.addPlugins = function(plugins) {
            if (plugins) {
              for (var i = 0; i < plugins.length; i++) {
                this.addPlugin(plugins[i]);
              }
            }
          };
          /**
           *
           * @param plugin
           */
          PluginManager.prototype.addPlugin = function(plugin) {
            this.installedPlugins.push(plugin);
            plugin.install(this.less, this);
          };
          /**
           * Adds a visitor. The visitor object has options on itself to determine
           * when it should run.
           * @param visitor
           */
          PluginManager.prototype.addVisitor = function(visitor) {
            this.visitors.push(visitor);
          };
          /**
           * Adds a pre processor object
           * @param {object} preProcessor
           * @param {number} priority - guidelines 1 = before import, 1000 = import, 2000 = after import
           */
          PluginManager.prototype.addPreProcessor = function(
            preProcessor,
            priority
          ) {
            var indexToInsertAt;
            for (
              indexToInsertAt = 0;
              indexToInsertAt < this.preProcessors.length;
              indexToInsertAt++
            ) {
              if (this.preProcessors[indexToInsertAt].priority >= priority) {
                break;
              }
            }
            this.preProcessors.splice(indexToInsertAt, 0, {
              preProcessor: preProcessor,
              priority: priority
            });
          };
          /**
           * Adds a post processor object
           * @param {object} postProcessor
           * @param {number} priority - guidelines 1 = before compression, 1000 = compression, 2000 = after compression
           */
          PluginManager.prototype.addPostProcessor = function(
            postProcessor,
            priority
          ) {
            var indexToInsertAt;
            for (
              indexToInsertAt = 0;
              indexToInsertAt < this.postProcessors.length;
              indexToInsertAt++
            ) {
              if (this.postProcessors[indexToInsertAt].priority >= priority) {
                break;
              }
            }
            this.postProcessors.splice(indexToInsertAt, 0, {
              postProcessor: postProcessor,
              priority: priority
            });
          };
          /**
           *
           * @param manager
           */
          PluginManager.prototype.addFileManager = function(manager) {
            this.fileManagers.push(manager);
          };
          /**
           *
           * @returns {Array}
           * @private
           */
          PluginManager.prototype.getPreProcessors = function() {
            var preProcessors = [];
            for (var i = 0; i < this.preProcessors.length; i++) {
              preProcessors.push(this.preProcessors[i].preProcessor);
            }
            return preProcessors;
          };
          /**
           *
           * @returns {Array}
           * @private
           */
          PluginManager.prototype.getPostProcessors = function() {
            var postProcessors = [];
            for (var i = 0; i < this.postProcessors.length; i++) {
              postProcessors.push(this.postProcessors[i].postProcessor);
            }
            return postProcessors;
          };
          /**
           *
           * @returns {Array}
           * @private
           */
          PluginManager.prototype.getVisitors = function() {
            return this.visitors;
          };
          /**
           *
           * @returns {Array}
           * @private
           */
          PluginManager.prototype.getFileManagers = function() {
            return this.fileManagers;
          };
          module.exports = PluginManager;
        },
        {}
      ],
      40: [
        function(require, module, exports) {
          var LessError = require("../less-error"),
            tree = require("../tree");

          var FunctionImporter = (module.exports = function FunctionImporter(
            context,
            fileInfo
          ) {
            this.fileInfo = fileInfo;
          });

          FunctionImporter.prototype.eval = function(contents, callback) {
            var loaded = {},
              loader,
              registry;

            registry = {
              add: function(name, func) {
                loaded[name] = func;
              },
              addMultiple: function(functions) {
                Object.keys(functions).forEach(function(name) {
                  loaded[name] = functions[name];
                });
              }
            };

            try {
              loader = new Function("functions", "tree", "fileInfo", contents);
              loader(registry, tree, this.fileInfo);
            } catch (e) {
              callback(
                new LessError({
                  message:
                    "Plugin evaluation error: '" +
                    e.name +
                    ": " +
                    e.message.replace(/["]/g, "'") +
                    "'",
                  filename: this.fileInfo.filename
                }),
                null
              );
            }

            callback(null, { functions: loaded });
          };
        },
        { "../less-error": 32, "../tree": 62 }
      ],
      41: [
        function(require, module, exports) {
          var PromiseConstructor;

          module.exports = function(environment, ParseTree, ImportManager) {
            var render = function(input, options, callback) {
              if (typeof options === "function") {
                callback = options;
                options = {};
              }

              if (!callback) {
                if (!PromiseConstructor) {
                  PromiseConstructor =
                    typeof Promise === "undefined"
                      ? require("promise")
                      : Promise;
                }
                var self = this;
                return new PromiseConstructor(function(resolve, reject) {
                  render.call(self, input, options, function(err, output) {
                    if (err) {
                      reject(err);
                    } else {
                      resolve(output);
                    }
                  });
                });
              } else {
                this.parse(input, options, function(
                  err,
                  root,
                  imports,
                  options
                ) {
                  if (err) {
                    return callback(err);
                  }

                  var result;
                  try {
                    var parseTree = new ParseTree(root, imports);
                    result = parseTree.toCSS(options);
                  } catch (err) {
                    return callback(err);
                  }

                  callback(null, result);
                });
              }
            };

            return render;
          };
        },
        { promise: undefined }
      ],
      42: [
        function(require, module, exports) {
          module.exports = function(SourceMapOutput, environment) {
            var SourceMapBuilder = function(options) {
              this.options = options;
            };

            SourceMapBuilder.prototype.toCSS = function(
              rootNode,
              options,
              imports
            ) {
              var sourceMapOutput = new SourceMapOutput({
                contentsIgnoredCharsMap: imports.contentsIgnoredChars,
                rootNode: rootNode,
                contentsMap: imports.contents,
                sourceMapFilename: this.options.sourceMapFilename,
                sourceMapURL: this.options.sourceMapURL,
                outputFilename: this.options.sourceMapOutputFilename,
                sourceMapBasepath: this.options.sourceMapBasepath,
                sourceMapRootpath: this.options.sourceMapRootpath,
                outputSourceFiles: this.options.outputSourceFiles,
                sourceMapGenerator: this.options.sourceMapGenerator,
                sourceMapFileInline: this.options.sourceMapFileInline
              });

              var css = sourceMapOutput.toCSS(options);
              this.sourceMap = sourceMapOutput.sourceMap;
              this.sourceMapURL = sourceMapOutput.sourceMapURL;
              if (this.options.sourceMapInputFilename) {
                this.sourceMapInputFilename = sourceMapOutput.normalizeFilename(
                  this.options.sourceMapInputFilename
                );
              }
              return css + this.getCSSAppendage();
            };

            SourceMapBuilder.prototype.getCSSAppendage = function() {
              var sourceMapURL = this.sourceMapURL;
              if (this.options.sourceMapFileInline) {
                if (this.sourceMap === undefined) {
                  return "";
                }
                sourceMapURL =
                  "data:application/json;base64," +
                  environment.encodeBase64(this.sourceMap);
              }

              if (sourceMapURL) {
                return "/*# sourceMappingURL=" + sourceMapURL + " */";
              }
              return "";
            };

            SourceMapBuilder.prototype.getExternalSourceMap = function() {
              return this.sourceMap;
            };
            SourceMapBuilder.prototype.setExternalSourceMap = function(
              sourceMap
            ) {
              this.sourceMap = sourceMap;
            };

            SourceMapBuilder.prototype.isInline = function() {
              return this.options.sourceMapFileInline;
            };
            SourceMapBuilder.prototype.getSourceMapURL = function() {
              return this.sourceMapURL;
            };
            SourceMapBuilder.prototype.getOutputFilename = function() {
              return this.options.sourceMapOutputFilename;
            };
            SourceMapBuilder.prototype.getInputFilename = function() {
              return this.sourceMapInputFilename;
            };

            return SourceMapBuilder;
          };
        },
        {}
      ],
      43: [
        function(require, module, exports) {
          module.exports = function(environment) {
            var SourceMapOutput = function(options) {
              this._css = [];
              this._rootNode = options.rootNode;
              this._contentsMap = options.contentsMap;
              this._contentsIgnoredCharsMap = options.contentsIgnoredCharsMap;
              if (options.sourceMapFilename) {
                this._sourceMapFilename = options.sourceMapFilename.replace(
                  /\\/g,
                  "/"
                );
              }
              this._outputFilename = options.outputFilename;
              this.sourceMapURL = options.sourceMapURL;
              if (options.sourceMapBasepath) {
                this._sourceMapBasepath = options.sourceMapBasepath.replace(
                  /\\/g,
                  "/"
                );
              }
              if (options.sourceMapRootpath) {
                this._sourceMapRootpath = options.sourceMapRootpath.replace(
                  /\\/g,
                  "/"
                );
                if (
                  this._sourceMapRootpath.charAt(
                    this._sourceMapRootpath.length - 1
                  ) !== "/"
                ) {
                  this._sourceMapRootpath += "/";
                }
              } else {
                this._sourceMapRootpath = "";
              }
              this._outputSourceFiles = options.outputSourceFiles;
              this._sourceMapGeneratorConstructor = environment.getSourceMapGenerator();

              this._lineNumber = 0;
              this._column = 0;
            };

            SourceMapOutput.prototype.normalizeFilename = function(filename) {
              filename = filename.replace(/\\/g, "/");

              if (
                this._sourceMapBasepath &&
                filename.indexOf(this._sourceMapBasepath) === 0
              ) {
                filename = filename.substring(this._sourceMapBasepath.length);
                if (filename.charAt(0) === "\\" || filename.charAt(0) === "/") {
                  filename = filename.substring(1);
                }
              }
              return (this._sourceMapRootpath || "") + filename;
            };

            SourceMapOutput.prototype.add = function(
              chunk,
              fileInfo,
              index,
              mapLines
            ) {
              //ignore adding empty strings
              if (!chunk) {
                return;
              }

              var lines, sourceLines, columns, sourceColumns, i;

              if (fileInfo) {
                var inputSource = this._contentsMap[fileInfo.filename];

                // remove vars/banner added to the top of the file
                if (this._contentsIgnoredCharsMap[fileInfo.filename]) {
                  // adjust the index
                  index -= this._contentsIgnoredCharsMap[fileInfo.filename];
                  if (index < 0) {
                    index = 0;
                  }
                  // adjust the source
                  inputSource = inputSource.slice(
                    this._contentsIgnoredCharsMap[fileInfo.filename]
                  );
                }
                inputSource = inputSource.substring(0, index);
                sourceLines = inputSource.split("\n");
                sourceColumns = sourceLines[sourceLines.length - 1];
              }

              lines = chunk.split("\n");
              columns = lines[lines.length - 1];

              if (fileInfo) {
                if (!mapLines) {
                  this._sourceMapGenerator.addMapping({
                    generated: {
                      line: this._lineNumber + 1,
                      column: this._column
                    },
                    original: {
                      line: sourceLines.length,
                      column: sourceColumns.length
                    },
                    source: this.normalizeFilename(fileInfo.filename)
                  });
                } else {
                  for (i = 0; i < lines.length; i++) {
                    this._sourceMapGenerator.addMapping({
                      generated: {
                        line: this._lineNumber + i + 1,
                        column: i === 0 ? this._column : 0
                      },
                      original: {
                        line: sourceLines.length + i,
                        column: i === 0 ? sourceColumns.length : 0
                      },
                      source: this.normalizeFilename(fileInfo.filename)
                    });
                  }
                }
              }

              if (lines.length === 1) {
                this._column += columns.length;
              } else {
                this._lineNumber += lines.length - 1;
                this._column = columns.length;
              }

              this._css.push(chunk);
            };

            SourceMapOutput.prototype.isEmpty = function() {
              return this._css.length === 0;
            };

            SourceMapOutput.prototype.toCSS = function(context) {
              this._sourceMapGenerator = new this._sourceMapGeneratorConstructor(
                {
                  file: this._outputFilename,
                  sourceRoot: null
                }
              );

              if (this._outputSourceFiles) {
                for (var filename in this._contentsMap) {
                  if (this._contentsMap.hasOwnProperty(filename)) {
                    var source = this._contentsMap[filename];
                    if (this._contentsIgnoredCharsMap[filename]) {
                      source = source.slice(
                        this._contentsIgnoredCharsMap[filename]
                      );
                    }
                    this._sourceMapGenerator.setSourceContent(
                      this.normalizeFilename(filename),
                      source
                    );
                  }
                }
              }

              this._rootNode.genCSS(context, this);

              if (this._css.length > 0) {
                var sourceMapURL,
                  sourceMapContent = JSON.stringify(
                    this._sourceMapGenerator.toJSON()
                  );

                if (this.sourceMapURL) {
                  sourceMapURL = this.sourceMapURL;
                } else if (this._sourceMapFilename) {
                  sourceMapURL = this._sourceMapFilename;
                }
                this.sourceMapURL = sourceMapURL;

                this.sourceMap = sourceMapContent;
              }

              return this._css.join("");
            };

            return SourceMapOutput;
          };
        },
        {}
      ],
      44: [
        function(require, module, exports) {
          var contexts = require("./contexts"),
            visitor = require("./visitors"),
            tree = require("./tree");

          module.exports = function(root, options) {
            options = options || {};
            var evaldRoot,
              variables = options.variables,
              evalEnv = new contexts.Eval(options);

            //
            // Allows setting variables with a hash, so:
            //
            //   `{ color: new tree.Color('#f01') }` will become:
            //
            //   new tree.Rule('@color',
            //     new tree.Value([
            //       new tree.Expression([
            //         new tree.Color('#f01')
            //       ])
            //     ])
            //   )
            //
            if (typeof variables === "object" && !Array.isArray(variables)) {
              variables = Object.keys(variables).map(function(k) {
                var value = variables[k];

                if (!(value instanceof tree.Value)) {
                  if (!(value instanceof tree.Expression)) {
                    value = new tree.Expression([value]);
                  }
                  value = new tree.Value([value]);
                }
                return new tree.Rule("@" + k, value, false, null, 0);
              });
              evalEnv.frames = [new tree.Ruleset(null, variables)];
            }

            var preEvalVisitors = [],
              visitors = [
                new visitor.JoinSelectorVisitor(),
                new visitor.MarkVisibleSelectorsVisitor(true),
                new visitor.ExtendVisitor(),
                new visitor.ToCSSVisitor({
                  compress: Boolean(options.compress)
                })
              ],
              i;

            if (options.pluginManager) {
              var pluginVisitors = options.pluginManager.getVisitors();
              for (i = 0; i < pluginVisitors.length; i++) {
                var pluginVisitor = pluginVisitors[i];
                if (pluginVisitor.isPreEvalVisitor) {
                  preEvalVisitors.push(pluginVisitor);
                } else {
                  if (pluginVisitor.isPreVisitor) {
                    visitors.splice(0, 0, pluginVisitor);
                  } else {
                    visitors.push(pluginVisitor);
                  }
                }
              }
            }

            for (i = 0; i < preEvalVisitors.length; i++) {
              preEvalVisitors[i].run(root);
            }

            evaldRoot = root.eval(evalEnv);

            for (i = 0; i < visitors.length; i++) {
              visitors[i].run(evaldRoot);
            }

            return evaldRoot;
          };
        },
        { "./contexts": 11, "./tree": 62, "./visitors": 87 }
      ],
      45: [
        function(require, module, exports) {
          var Node = require("./node");

          var Alpha = function(val) {
            this.value = val;
          };
          Alpha.prototype = new Node();
          Alpha.prototype.type = "Alpha";

          Alpha.prototype.accept = function(visitor) {
            this.value = visitor.visit(this.value);
          };
          Alpha.prototype.eval = function(context) {
            if (this.value.eval) {
              return new Alpha(this.value.eval(context));
            }
            return this;
          };
          Alpha.prototype.genCSS = function(context, output) {
            output.add("alpha(opacity=");

            if (this.value.genCSS) {
              this.value.genCSS(context, output);
            } else {
              output.add(this.value);
            }

            output.add(")");
          };

          module.exports = Alpha;
        },
        { "./node": 70 }
      ],
      46: [
        function(require, module, exports) {
          var Node = require("./node");

          var Anonymous = function(
            value,
            index,
            currentFileInfo,
            mapLines,
            rulesetLike,
            visibilityInfo
          ) {
            this.value = value;
            this.index = index;
            this.mapLines = mapLines;
            this.currentFileInfo = currentFileInfo;
            this.rulesetLike =
              typeof rulesetLike === "undefined" ? false : rulesetLike;
            this.allowRoot = true;
            this.copyVisibilityInfo(visibilityInfo);
          };
          Anonymous.prototype = new Node();
          Anonymous.prototype.type = "Anonymous";
          Anonymous.prototype.eval = function() {
            return new Anonymous(
              this.value,
              this.index,
              this.currentFileInfo,
              this.mapLines,
              this.rulesetLike,
              this.visibilityInfo()
            );
          };
          Anonymous.prototype.compare = function(other) {
            return other.toCSS && this.toCSS() === other.toCSS()
              ? 0
              : undefined;
          };
          Anonymous.prototype.isRulesetLike = function() {
            return this.rulesetLike;
          };
          Anonymous.prototype.genCSS = function(context, output) {
            output.add(
              this.value,
              this.currentFileInfo,
              this.index,
              this.mapLines
            );
          };
          module.exports = Anonymous;
        },
        { "./node": 70 }
      ],
      47: [
        function(require, module, exports) {
          var Node = require("./node");

          var Assignment = function(key, val) {
            this.key = key;
            this.value = val;
          };

          Assignment.prototype = new Node();
          Assignment.prototype.type = "Assignment";
          Assignment.prototype.accept = function(visitor) {
            this.value = visitor.visit(this.value);
          };
          Assignment.prototype.eval = function(context) {
            if (this.value.eval) {
              return new Assignment(this.key, this.value.eval(context));
            }
            return this;
          };
          Assignment.prototype.genCSS = function(context, output) {
            output.add(this.key + "=");
            if (this.value.genCSS) {
              this.value.genCSS(context, output);
            } else {
              output.add(this.value);
            }
          };
          module.exports = Assignment;
        },
        { "./node": 70 }
      ],
      48: [
        function(require, module, exports) {
          var Node = require("./node");

          var Attribute = function(key, op, value) {
            this.key = key;
            this.op = op;
            this.value = value;
          };
          Attribute.prototype = new Node();
          Attribute.prototype.type = "Attribute";
          Attribute.prototype.eval = function(context) {
            return new Attribute(
              this.key.eval ? this.key.eval(context) : this.key,
              this.op,
              this.value && this.value.eval
                ? this.value.eval(context)
                : this.value
            );
          };
          Attribute.prototype.genCSS = function(context, output) {
            output.add(this.toCSS(context));
          };
          Attribute.prototype.toCSS = function(context) {
            var value = this.key.toCSS ? this.key.toCSS(context) : this.key;

            if (this.op) {
              value += this.op;
              value += this.value.toCSS
                ? this.value.toCSS(context)
                : this.value;
            }

            return "[" + value + "]";
          };
          module.exports = Attribute;
        },
        { "./node": 70 }
      ],
      49: [
        function(require, module, exports) {
          var Node = require("./node"),
            FunctionCaller = require("../functions/function-caller");
          //
          // A function call node.
          //
          var Call = function(name, args, index, currentFileInfo) {
            this.name = name;
            this.args = args;
            this.index = index;
            this.currentFileInfo = currentFileInfo;
          };
          Call.prototype = new Node();
          Call.prototype.type = "Call";
          Call.prototype.accept = function(visitor) {
            if (this.args) {
              this.args = visitor.visitArray(this.args);
            }
          };
          //
          // When evaluating a function call,
          // we either find the function in the functionRegistry,
          // in which case we call it, passing the  evaluated arguments,
          // if this returns null or we cannot find the function, we
          // simply print it out as it appeared originally [2].
          //
          // The reason why we evaluate the arguments, is in the case where
          // we try to pass a variable to a function, like: `saturate(@color)`.
          // The function should receive the value, not the variable.
          //
          Call.prototype.eval = function(context) {
            var args = this.args.map(function(a) {
                return a.eval(context);
              }),
              result,
              funcCaller = new FunctionCaller(
                this.name,
                context,
                this.index,
                this.currentFileInfo
              );

            if (funcCaller.isValid()) {
              try {
                result = funcCaller.call(args);
              } catch (e) {
                throw {
                  type: e.type || "Runtime",
                  message:
                    "error evaluating function `" +
                    this.name +
                    "`" +
                    (e.message ? ": " + e.message : ""),
                  index: this.index,
                  filename: this.currentFileInfo.filename
                };
              }

              if (result != null) {
                result.index = this.index;
                result.currentFileInfo = this.currentFileInfo;
                return result;
              }
            }

            return new Call(this.name, args, this.index, this.currentFileInfo);
          };
          Call.prototype.genCSS = function(context, output) {
            output.add(this.name + "(", this.currentFileInfo, this.index);

            for (var i = 0; i < this.args.length; i++) {
              this.args[i].genCSS(context, output);
              if (i + 1 < this.args.length) {
                output.add(", ");
              }
            }

            output.add(")");
          };
          module.exports = Call;
        },
        { "../functions/function-caller": 21, "./node": 70 }
      ],
      50: [
        function(require, module, exports) {
          var Node = require("./node"),
            colors = require("../data/colors");

          //
          // RGB Colors - #ff0014, #eee
          //
          var Color = function(rgb, a, originalForm) {
            //
            // The end goal here, is to parse the arguments
            // into an integer triplet, such as `128, 255, 0`
            //
            // This facilitates operations and conversions.
            //
            if (Array.isArray(rgb)) {
              this.rgb = rgb;
            } else if (rgb.length == 6) {
              this.rgb = rgb.match(/.{2}/g).map(function(c) {
                return parseInt(c, 16);
              });
            } else {
              this.rgb = rgb.split("").map(function(c) {
                return parseInt(c + c, 16);
              });
            }
            this.alpha = typeof a === "number" ? a : 1;
            if (typeof originalForm !== "undefined") {
              this.value = originalForm;
            }
          };

          Color.prototype = new Node();
          Color.prototype.type = "Color";

          function clamp(v, max) {
            return Math.min(Math.max(v, 0), max);
          }

          function toHex(v) {
            return (
              "#" +
              v
                .map(function(c) {
                  c = clamp(Math.round(c), 255);
                  return (c < 16 ? "0" : "") + c.toString(16);
                })
                .join("")
            );
          }

          Color.prototype.luma = function() {
            var r = this.rgb[0] / 255,
              g = this.rgb[1] / 255,
              b = this.rgb[2] / 255;

            r = r <= 0.03928 ? r / 12.92 : Math.pow((r + 0.055) / 1.055, 2.4);
            g = g <= 0.03928 ? g / 12.92 : Math.pow((g + 0.055) / 1.055, 2.4);
            b = b <= 0.03928 ? b / 12.92 : Math.pow((b + 0.055) / 1.055, 2.4);

            return 0.2126 * r + 0.7152 * g + 0.0722 * b;
          };
          Color.prototype.genCSS = function(context, output) {
            output.add(this.toCSS(context));
          };
          Color.prototype.toCSS = function(context, doNotCompress) {
            var compress = context && context.compress && !doNotCompress,
              color,
              alpha;

            // `value` is set if this color was originally
            // converted from a named color string so we need
            // to respect this and try to output named color too.
            if (this.value) {
              return this.value;
            }

            // If we have some transparency, the only way to represent it
            // is via `rgba`. Otherwise, we use the hex representation,
            // which has better compatibility with older browsers.
            // Values are capped between `0` and `255`, rounded and zero-padded.
            alpha = this.fround(context, this.alpha);
            if (alpha < 1) {
              return (
                "rgba(" +
                this.rgb
                  .map(function(c) {
                    return clamp(Math.round(c), 255);
                  })
                  .concat(clamp(alpha, 1))
                  .join("," + (compress ? "" : " ")) +
                ")"
              );
            }

            color = this.toRGB();

            if (compress) {
              var splitcolor = color.split("");

              // Convert color to short format
              if (
                splitcolor[1] === splitcolor[2] &&
                splitcolor[3] === splitcolor[4] &&
                splitcolor[5] === splitcolor[6]
              ) {
                color = "#" + splitcolor[1] + splitcolor[3] + splitcolor[5];
              }
            }

            return color;
          };

          //
          // Operations have to be done per-channel, if not,
          // channels will spill onto each other. Once we have
          // our result, in the form of an integer triplet,
          // we create a new Color node to hold the result.
          //
          Color.prototype.operate = function(context, op, other) {
            var rgb = [];
            var alpha = this.alpha * (1 - other.alpha) + other.alpha;
            for (var c = 0; c < 3; c++) {
              rgb[c] = this._operate(context, op, this.rgb[c], other.rgb[c]);
            }
            return new Color(rgb, alpha);
          };
          Color.prototype.toRGB = function() {
            return toHex(this.rgb);
          };
          Color.prototype.toHSL = function() {
            var r = this.rgb[0] / 255,
              g = this.rgb[1] / 255,
              b = this.rgb[2] / 255,
              a = this.alpha;

            var max = Math.max(r, g, b),
              min = Math.min(r, g, b);
            var h,
              s,
              l = (max + min) / 2,
              d = max - min;

            if (max === min) {
              h = s = 0;
            } else {
              s = l > 0.5 ? d / (2 - max - min) : d / (max + min);

              switch (max) {
                case r:
                  h = (g - b) / d + (g < b ? 6 : 0);
                  break;
                case g:
                  h = (b - r) / d + 2;
                  break;
                case b:
                  h = (r - g) / d + 4;
                  break;
              }
              h /= 6;
            }
            return { h: h * 360, s: s, l: l, a: a };
          };
          //Adapted from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
          Color.prototype.toHSV = function() {
            var r = this.rgb[0] / 255,
              g = this.rgb[1] / 255,
              b = this.rgb[2] / 255,
              a = this.alpha;

            var max = Math.max(r, g, b),
              min = Math.min(r, g, b);
            var h,
              s,
              v = max;

            var d = max - min;
            if (max === 0) {
              s = 0;
            } else {
              s = d / max;
            }

            if (max === min) {
              h = 0;
            } else {
              switch (max) {
                case r:
                  h = (g - b) / d + (g < b ? 6 : 0);
                  break;
                case g:
                  h = (b - r) / d + 2;
                  break;
                case b:
                  h = (r - g) / d + 4;
                  break;
              }
              h /= 6;
            }
            return { h: h * 360, s: s, v: v, a: a };
          };
          Color.prototype.toARGB = function() {
            return toHex([this.alpha * 255].concat(this.rgb));
          };
          Color.prototype.compare = function(x) {
            return x.rgb &&
              x.rgb[0] === this.rgb[0] &&
              x.rgb[1] === this.rgb[1] &&
              x.rgb[2] === this.rgb[2] &&
              x.alpha === this.alpha
              ? 0
              : undefined;
          };

          Color.fromKeyword = function(keyword) {
            var c,
              key = keyword.toLowerCase();
            if (colors.hasOwnProperty(key)) {
              c = new Color(colors[key].slice(1));
            } else if (key === "transparent") {
              c = new Color([0, 0, 0], 0);
            }

            if (c) {
              c.value = keyword;
              return c;
            }
          };
          module.exports = Color;
        },
        { "../data/colors": 12, "./node": 70 }
      ],
      51: [
        function(require, module, exports) {
          var Node = require("./node");

          var Combinator = function(value) {
            if (value === " ") {
              this.value = " ";
              this.emptyOrWhitespace = true;
            } else {
              this.value = value ? value.trim() : "";
              this.emptyOrWhitespace = this.value === "";
            }
          };
          Combinator.prototype = new Node();
          Combinator.prototype.type = "Combinator";
          var _noSpaceCombinators = {
            "": true,
            " ": true,
            "|": true
          };
          Combinator.prototype.genCSS = function(context, output) {
            var spaceOrEmpty =
              context.compress || _noSpaceCombinators[this.value] ? "" : " ";
            output.add(spaceOrEmpty + this.value + spaceOrEmpty);
          };
          module.exports = Combinator;
        },
        { "./node": 70 }
      ],
      52: [
        function(require, module, exports) {
          var Node = require("./node"),
            getDebugInfo = require("./debug-info");

          var Comment = function(value, isLineComment, index, currentFileInfo) {
            this.value = value;
            this.isLineComment = isLineComment;
            this.index = index;
            this.currentFileInfo = currentFileInfo;
            this.allowRoot = true;
          };
          Comment.prototype = new Node();
          Comment.prototype.type = "Comment";
          Comment.prototype.genCSS = function(context, output) {
            if (this.debugInfo) {
              output.add(
                getDebugInfo(context, this),
                this.currentFileInfo,
                this.index
              );
            }
            output.add(this.value);
          };
          Comment.prototype.isSilent = function(context) {
            var isCompressed = context.compress && this.value[2] !== "!";
            return this.isLineComment || isCompressed;
          };
          module.exports = Comment;
        },
        { "./debug-info": 54, "./node": 70 }
      ],
      53: [
        function(require, module, exports) {
          var Node = require("./node");

          var Condition = function(op, l, r, i, negate) {
            this.op = op.trim();
            this.lvalue = l;
            this.rvalue = r;
            this.index = i;
            this.negate = negate;
          };
          Condition.prototype = new Node();
          Condition.prototype.type = "Condition";
          Condition.prototype.accept = function(visitor) {
            this.lvalue = visitor.visit(this.lvalue);
            this.rvalue = visitor.visit(this.rvalue);
          };
          Condition.prototype.eval = function(context) {
            var result = (function(op, a, b) {
              switch (op) {
                case "and":
                  return a && b;
                case "or":
                  return a || b;
                default:
                  switch (Node.compare(a, b)) {
                    case -1:
                      return op === "<" || op === "=<" || op === "<=";
                    case 0:
                      return (
                        op === "=" || op === ">=" || op === "=<" || op === "<="
                      );
                    case 1:
                      return op === ">" || op === ">=";
                    default:
                      return false;
                  }
              }
            })(this.op, this.lvalue.eval(context), this.rvalue.eval(context));

            return this.negate ? !result : result;
          };
          module.exports = Condition;
        },
        { "./node": 70 }
      ],
      54: [
        function(require, module, exports) {
          var debugInfo = function(context, ctx, lineSeparator) {
            var result = "";
            if (context.dumpLineNumbers && !context.compress) {
              switch (context.dumpLineNumbers) {
                case "comments":
                  result = debugInfo.asComment(ctx);
                  break;
                case "mediaquery":
                  result = debugInfo.asMediaQuery(ctx);
                  break;
                case "all":
                  result =
                    debugInfo.asComment(ctx) +
                    (lineSeparator || "") +
                    debugInfo.asMediaQuery(ctx);
                  break;
              }
            }
            return result;
          };

          debugInfo.asComment = function(ctx) {
            return (
              "/* line " +
              ctx.debugInfo.lineNumber +
              ", " +
              ctx.debugInfo.fileName +
              " */\n"
            );
          };

          debugInfo.asMediaQuery = function(ctx) {
            var filenameWithProtocol = ctx.debugInfo.fileName;
            if (!/^[a-z]+:\/\//i.test(filenameWithProtocol)) {
              filenameWithProtocol = "file://" + filenameWithProtocol;
            }
            return (
              "@media -sass-debug-info{filename{font-family:" +
              filenameWithProtocol.replace(/([.:\/\\])/g, function(a) {
                if (a == "\\") {
                  a = "/";
                }
                return "\\" + a;
              }) +
              "}line{font-family:\\00003" +
              ctx.debugInfo.lineNumber +
              "}}\n"
            );
          };

          module.exports = debugInfo;
        },
        {}
      ],
      55: [
        function(require, module, exports) {
          var Node = require("./node"),
            contexts = require("../contexts");

          var DetachedRuleset = function(ruleset, frames) {
            this.ruleset = ruleset;
            this.frames = frames;
          };
          DetachedRuleset.prototype = new Node();
          DetachedRuleset.prototype.type = "DetachedRuleset";
          DetachedRuleset.prototype.evalFirst = true;
          DetachedRuleset.prototype.accept = function(visitor) {
            this.ruleset = visitor.visit(this.ruleset);
          };
          DetachedRuleset.prototype.eval = function(context) {
            var frames = this.frames || context.frames.slice(0);
            return new DetachedRuleset(this.ruleset, frames);
          };
          DetachedRuleset.prototype.callEval = function(context) {
            return this.ruleset.eval(
              this.frames
                ? new contexts.Eval(context, this.frames.concat(context.frames))
                : context
            );
          };
          module.exports = DetachedRuleset;
        },
        { "../contexts": 11, "./node": 70 }
      ],
      56: [
        function(require, module, exports) {
          var Node = require("./node"),
            unitConversions = require("../data/unit-conversions"),
            Unit = require("./unit"),
            Color = require("./color");

          //
          // A number with a unit
          //
          var Dimension = function(value, unit) {
            this.value = parseFloat(value);
            this.unit =
              unit && unit instanceof Unit
                ? unit
                : new Unit(unit ? [unit] : undefined);
          };

          Dimension.prototype = new Node();
          Dimension.prototype.type = "Dimension";
          Dimension.prototype.accept = function(visitor) {
            this.unit = visitor.visit(this.unit);
          };
          Dimension.prototype.eval = function(context) {
            return this;
          };
          Dimension.prototype.toColor = function() {
            return new Color([this.value, this.value, this.value]);
          };
          Dimension.prototype.genCSS = function(context, output) {
            if (context && context.strictUnits && !this.unit.isSingular()) {
              throw new Error(
                "Multiple units in dimension. Correct the units or use the unit function. Bad unit: " +
                  this.unit.toString()
              );
            }

            var value = this.fround(context, this.value),
              strValue = String(value);

            if (value !== 0 && value < 0.000001 && value > -0.000001) {
              // would be output 1e-6 etc.
              strValue = value.toFixed(20).replace(/0+$/, "");
            }

            if (context && context.compress) {
              // Zero values doesn't need a unit
              if (value === 0 && this.unit.isLength()) {
                output.add(strValue);
                return;
              }

              // Float values doesn't need a leading zero
              if (value > 0 && value < 1) {
                strValue = strValue.substr(1);
              }
            }

            output.add(strValue);
            this.unit.genCSS(context, output);
          };

          // In an operation between two Dimensions,
          // we default to the first Dimension's unit,
          // so `1px + 2` will yield `3px`.
          Dimension.prototype.operate = function(context, op, other) {
            /*jshint noempty:false */
            var value = this._operate(context, op, this.value, other.value),
              unit = this.unit.clone();

            if (op === "+" || op === "-") {
              if (
                unit.numerator.length === 0 &&
                unit.denominator.length === 0
              ) {
                unit = other.unit.clone();
                if (this.unit.backupUnit) {
                  unit.backupUnit = this.unit.backupUnit;
                }
              } else if (
                other.unit.numerator.length === 0 &&
                unit.denominator.length === 0
              ) {
                // do nothing
              } else {
                other = other.convertTo(this.unit.usedUnits());

                if (
                  context.strictUnits &&
                  other.unit.toString() !== unit.toString()
                ) {
                  throw new Error(
                    "Incompatible units. Change the units or use the unit function. Bad units: '" +
                      unit.toString() +
                      "' and '" +
                      other.unit.toString() +
                      "'."
                  );
                }

                value = this._operate(context, op, this.value, other.value);
              }
            } else if (op === "*") {
              unit.numerator = unit.numerator
                .concat(other.unit.numerator)
                .sort();
              unit.denominator = unit.denominator
                .concat(other.unit.denominator)
                .sort();
              unit.cancel();
            } else if (op === "/") {
              unit.numerator = unit.numerator
                .concat(other.unit.denominator)
                .sort();
              unit.denominator = unit.denominator
                .concat(other.unit.numerator)
                .sort();
              unit.cancel();
            }
            return new Dimension(value, unit);
          };
          Dimension.prototype.compare = function(other) {
            var a, b;

            if (!(other instanceof Dimension)) {
              return undefined;
            }

            if (this.unit.isEmpty() || other.unit.isEmpty()) {
              a = this;
              b = other;
            } else {
              a = this.unify();
              b = other.unify();
              if (a.unit.compare(b.unit) !== 0) {
                return undefined;
              }
            }

            return Node.numericCompare(a.value, b.value);
          };
          Dimension.prototype.unify = function() {
            return this.convertTo({
              length: "px",
              duration: "s",
              angle: "rad"
            });
          };
          Dimension.prototype.convertTo = function(conversions) {
            var value = this.value,
              unit = this.unit.clone(),
              i,
              groupName,
              group,
              targetUnit,
              derivedConversions = {},
              applyUnit;

            if (typeof conversions === "string") {
              for (i in unitConversions) {
                if (unitConversions[i].hasOwnProperty(conversions)) {
                  derivedConversions = {};
                  derivedConversions[i] = conversions;
                }
              }
              conversions = derivedConversions;
            }
            applyUnit = function(atomicUnit, denominator) {
              /* jshint loopfunc:true */
              if (group.hasOwnProperty(atomicUnit)) {
                if (denominator) {
                  value = value / (group[atomicUnit] / group[targetUnit]);
                } else {
                  value = value * (group[atomicUnit] / group[targetUnit]);
                }

                return targetUnit;
              }

              return atomicUnit;
            };

            for (groupName in conversions) {
              if (conversions.hasOwnProperty(groupName)) {
                targetUnit = conversions[groupName];
                group = unitConversions[groupName];

                unit.map(applyUnit);
              }
            }

            unit.cancel();

            return new Dimension(value, unit);
          };
          module.exports = Dimension;
        },
        {
          "../data/unit-conversions": 14,
          "./color": 50,
          "./node": 70,
          "./unit": 79
        }
      ],
      57: [
        function(require, module, exports) {
          var Node = require("./node"),
            Selector = require("./selector"),
            Ruleset = require("./ruleset");

          var Directive = function(
            name,
            value,
            rules,
            index,
            currentFileInfo,
            debugInfo,
            isRooted,
            visibilityInfo
          ) {
            var i;

            this.name = name;
            this.value = value;
            if (rules) {
              if (Array.isArray(rules)) {
                this.rules = rules;
              } else {
                this.rules = [rules];
                this.rules[0].selectors = new Selector(
                  [],
                  null,
                  null,
                  this.index,
                  currentFileInfo
                ).createEmptySelectors();
              }
              for (i = 0; i < this.rules.length; i++) {
                this.rules[i].allowImports = true;
              }
            }
            this.index = index;
            this.currentFileInfo = currentFileInfo;
            this.debugInfo = debugInfo;
            this.isRooted = isRooted || false;
            this.copyVisibilityInfo(visibilityInfo);
            this.allowRoot = true;
          };

          Directive.prototype = new Node();
          Directive.prototype.type = "Directive";
          Directive.prototype.accept = function(visitor) {
            var value = this.value,
              rules = this.rules;
            if (rules) {
              this.rules = visitor.visitArray(rules);
            }
            if (value) {
              this.value = visitor.visit(value);
            }
          };
          Directive.prototype.isRulesetLike = function() {
            return this.rules || !this.isCharset();
          };
          Directive.prototype.isCharset = function() {
            return "@charset" === this.name;
          };
          Directive.prototype.genCSS = function(context, output) {
            var value = this.value,
              rules = this.rules;
            output.add(this.name, this.currentFileInfo, this.index);
            if (value) {
              output.add(" ");
              value.genCSS(context, output);
            }
            if (rules) {
              this.outputRuleset(context, output, rules);
            } else {
              output.add(";");
            }
          };
          Directive.prototype.eval = function(context) {
            var mediaPathBackup,
              mediaBlocksBackup,
              value = this.value,
              rules = this.rules;

            //media stored inside other directive should not bubble over it
            //backpup media bubbling information
            mediaPathBackup = context.mediaPath;
            mediaBlocksBackup = context.mediaBlocks;
            //deleted media bubbling information
            context.mediaPath = [];
            context.mediaBlocks = [];

            if (value) {
              value = value.eval(context);
            }
            if (rules) {
              // assuming that there is only one rule at this point - that is how parser constructs the rule
              rules = [rules[0].eval(context)];
              rules[0].root = true;
            }
            //restore media bubbling information
            context.mediaPath = mediaPathBackup;
            context.mediaBlocks = mediaBlocksBackup;

            return new Directive(
              this.name,
              value,
              rules,
              this.index,
              this.currentFileInfo,
              this.debugInfo,
              this.isRooted,
              this.visibilityInfo()
            );
          };
          Directive.prototype.variable = function(name) {
            if (this.rules) {
              // assuming that there is only one rule at this point - that is how parser constructs the rule
              return Ruleset.prototype.variable.call(this.rules[0], name);
            }
          };
          Directive.prototype.find = function() {
            if (this.rules) {
              // assuming that there is only one rule at this point - that is how parser constructs the rule
              return Ruleset.prototype.find.apply(this.rules[0], arguments);
            }
          };
          Directive.prototype.rulesets = function() {
            if (this.rules) {
              // assuming that there is only one rule at this point - that is how parser constructs the rule
              return Ruleset.prototype.rulesets.apply(this.rules[0]);
            }
          };
          Directive.prototype.outputRuleset = function(context, output, rules) {
            var ruleCnt = rules.length,
              i;
            context.tabLevel = (context.tabLevel | 0) + 1;

            // Compressed
            if (context.compress) {
              output.add("{");
              for (i = 0; i < ruleCnt; i++) {
                rules[i].genCSS(context, output);
              }
              output.add("}");
              context.tabLevel--;
              return;
            }

            // Non-compressed
            var tabSetStr = "\n" + Array(context.tabLevel).join("  "),
              tabRuleStr = tabSetStr + "  ";
            if (!ruleCnt) {
              output.add(" {" + tabSetStr + "}");
            } else {
              output.add(" {" + tabRuleStr);
              rules[0].genCSS(context, output);
              for (i = 1; i < ruleCnt; i++) {
                output.add(tabRuleStr);
                rules[i].genCSS(context, output);
              }
              output.add(tabSetStr + "}");
            }

            context.tabLevel--;
          };
          module.exports = Directive;
        },
        { "./node": 70, "./ruleset": 76, "./selector": 77 }
      ],
      58: [
        function(require, module, exports) {
          var Node = require("./node"),
            Paren = require("./paren"),
            Combinator = require("./combinator");

          var Element = function(
            combinator,
            value,
            index,
            currentFileInfo,
            info
          ) {
            this.combinator =
              combinator instanceof Combinator
                ? combinator
                : new Combinator(combinator);

            if (typeof value === "string") {
              this.value = value.trim();
            } else if (value) {
              this.value = value;
            } else {
              this.value = "";
            }
            this.index = index;
            this.currentFileInfo = currentFileInfo;
            this.copyVisibilityInfo(info);
          };
          Element.prototype = new Node();
          Element.prototype.type = "Element";
          Element.prototype.accept = function(visitor) {
            var value = this.value;
            this.combinator = visitor.visit(this.combinator);
            if (typeof value === "object") {
              this.value = visitor.visit(value);
            }
          };
          Element.prototype.eval = function(context) {
            return new Element(
              this.combinator,
              this.value.eval ? this.value.eval(context) : this.value,
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
          };
          Element.prototype.clone = function() {
            return new Element(
              this.combinator,
              this.value,
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
          };
          Element.prototype.genCSS = function(context, output) {
            output.add(this.toCSS(context), this.currentFileInfo, this.index);
          };
          Element.prototype.toCSS = function(context) {
            context = context || {};
            var value = this.value,
              firstSelector = context.firstSelector;
            if (value instanceof Paren) {
              // selector in parens should not be affected by outer selector
              // flags (breaks only interpolated selectors - see #1973)
              context.firstSelector = true;
            }
            value = value.toCSS ? value.toCSS(context) : value;
            context.firstSelector = firstSelector;
            if (value === "" && this.combinator.value.charAt(0) === "&") {
              return "";
            } else {
              return this.combinator.toCSS(context) + value;
            }
          };
          module.exports = Element;
        },
        { "./combinator": 51, "./node": 70, "./paren": 72 }
      ],
      59: [
        function(require, module, exports) {
          var Node = require("./node"),
            Paren = require("./paren"),
            Comment = require("./comment");

          var Expression = function(value) {
            this.value = value;
            if (!value) {
              throw new Error("Expression requires an array parameter");
            }
          };
          Expression.prototype = new Node();
          Expression.prototype.type = "Expression";
          Expression.prototype.accept = function(visitor) {
            this.value = visitor.visitArray(this.value);
          };
          Expression.prototype.eval = function(context) {
            var returnValue,
              inParenthesis = this.parens && !this.parensInOp,
              doubleParen = false;
            if (inParenthesis) {
              context.inParenthesis();
            }
            if (this.value.length > 1) {
              returnValue = new Expression(
                this.value.map(function(e) {
                  return e.eval(context);
                })
              );
            } else if (this.value.length === 1) {
              if (this.value[0].parens && !this.value[0].parensInOp) {
                doubleParen = true;
              }
              returnValue = this.value[0].eval(context);
            } else {
              returnValue = this;
            }
            if (inParenthesis) {
              context.outOfParenthesis();
            }
            if (
              this.parens &&
              this.parensInOp &&
              !context.isMathOn() &&
              !doubleParen
            ) {
              returnValue = new Paren(returnValue);
            }
            return returnValue;
          };
          Expression.prototype.genCSS = function(context, output) {
            for (var i = 0; i < this.value.length; i++) {
              this.value[i].genCSS(context, output);
              if (i + 1 < this.value.length) {
                output.add(" ");
              }
            }
          };
          Expression.prototype.throwAwayComments = function() {
            this.value = this.value.filter(function(v) {
              return !(v instanceof Comment);
            });
          };
          module.exports = Expression;
        },
        { "./comment": 52, "./node": 70, "./paren": 72 }
      ],
      60: [
        function(require, module, exports) {
          var Node = require("./node"),
            Selector = require("./selector");

          var Extend = function Extend(
            selector,
            option,
            index,
            currentFileInfo,
            visibilityInfo
          ) {
            this.selector = selector;
            this.option = option;
            this.index = index;
            this.object_id = Extend.next_id++;
            this.parent_ids = [this.object_id];
            this.currentFileInfo = currentFileInfo || {};
            this.copyVisibilityInfo(visibilityInfo);
            this.allowRoot = true;

            switch (option) {
              case "all":
                this.allowBefore = true;
                this.allowAfter = true;
                break;
              default:
                this.allowBefore = false;
                this.allowAfter = false;
                break;
            }
          };
          Extend.next_id = 0;

          Extend.prototype = new Node();
          Extend.prototype.type = "Extend";
          Extend.prototype.accept = function(visitor) {
            this.selector = visitor.visit(this.selector);
          };
          Extend.prototype.eval = function(context) {
            return new Extend(
              this.selector.eval(context),
              this.option,
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
          };
          Extend.prototype.clone = function(context) {
            return new Extend(
              this.selector,
              this.option,
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
          };
          //it concatenates (joins) all selectors in selector array
          Extend.prototype.findSelfSelectors = function(selectors) {
            var selfElements = [],
              i,
              selectorElements;

            for (i = 0; i < selectors.length; i++) {
              selectorElements = selectors[i].elements;
              // duplicate the logic in genCSS function inside the selector node.
              // future TODO - move both logics into the selector joiner visitor
              if (
                i > 0 &&
                selectorElements.length &&
                selectorElements[0].combinator.value === ""
              ) {
                selectorElements[0].combinator.value = " ";
              }
              selfElements = selfElements.concat(selectors[i].elements);
            }

            this.selfSelectors = [new Selector(selfElements)];
            this.selfSelectors[0].copyVisibilityInfo(this.visibilityInfo());
          };
          module.exports = Extend;
        },
        { "./node": 70, "./selector": 77 }
      ],
      61: [
        function(require, module, exports) {
          var Node = require("./node"),
            Media = require("./media"),
            URL = require("./url"),
            Quoted = require("./quoted"),
            Ruleset = require("./ruleset"),
            Anonymous = require("./anonymous");

          //
          // CSS @import node
          //
          // The general strategy here is that we don't want to wait
          // for the parsing to be completed, before we start importing
          // the file. That's because in the context of a browser,
          // most of the time will be spent waiting for the server to respond.
          //
          // On creation, we push the import path to our import queue, though
          // `import,push`, we also pass it a callback, which it'll call once
          // the file has been fetched, and parsed.
          //
          var Import = function(
            path,
            features,
            options,
            index,
            currentFileInfo,
            visibilityInfo
          ) {
            this.options = options;
            this.index = index;
            this.path = path;
            this.features = features;
            this.currentFileInfo = currentFileInfo;
            this.allowRoot = true;

            if (this.options.less !== undefined || this.options.inline) {
              this.css = !this.options.less || this.options.inline;
            } else {
              var pathValue = this.getPath();
              if (pathValue && /[#\.\&\?\/]css([\?;].*)?$/.test(pathValue)) {
                this.css = true;
              }
            }
            this.copyVisibilityInfo(visibilityInfo);
          };

          //
          // The actual import node doesn't return anything, when converted to CSS.
          // The reason is that it's used at the evaluation stage, so that the rules
          // it imports can be treated like any other rules.
          //
          // In `eval`, we make sure all Import nodes get evaluated, recursively, so
          // we end up with a flat structure, which can easily be imported in the parent
          // ruleset.
          //
          Import.prototype = new Node();
          Import.prototype.type = "Import";
          Import.prototype.accept = function(visitor) {
            if (this.features) {
              this.features = visitor.visit(this.features);
            }
            this.path = visitor.visit(this.path);
            if (!this.options.plugin && !this.options.inline && this.root) {
              this.root = visitor.visit(this.root);
            }
          };
          Import.prototype.genCSS = function(context, output) {
            if (this.css && this.path.currentFileInfo.reference === undefined) {
              output.add("@import ", this.currentFileInfo, this.index);
              this.path.genCSS(context, output);
              if (this.features) {
                output.add(" ");
                this.features.genCSS(context, output);
              }
              output.add(";");
            }
          };
          Import.prototype.getPath = function() {
            return this.path instanceof URL
              ? this.path.value.value
              : this.path.value;
          };
          Import.prototype.isVariableImport = function() {
            var path = this.path;
            if (path instanceof URL) {
              path = path.value;
            }
            if (path instanceof Quoted) {
              return path.containsVariables();
            }

            return true;
          };
          Import.prototype.evalForImport = function(context) {
            var path = this.path;

            if (path instanceof URL) {
              path = path.value;
            }

            return new Import(
              path.eval(context),
              this.features,
              this.options,
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
          };
          Import.prototype.evalPath = function(context) {
            var path = this.path.eval(context);
            var rootpath =
              this.currentFileInfo && this.currentFileInfo.rootpath;

            if (!(path instanceof URL)) {
              if (rootpath) {
                var pathValue = path.value;
                // Add the base path if the import is relative
                if (pathValue && context.isPathRelative(pathValue)) {
                  path.value = rootpath + pathValue;
                }
              }
              path.value = context.normalizePath(path.value);
            }

            return path;
          };
          Import.prototype.eval = function(context) {
            var result = this.doEval(context);
            if (this.options.reference || this.blocksVisibility()) {
              if (result.length || result.length === 0) {
                result.forEach(function(node) {
                  node.addVisibilityBlock();
                });
              } else {
                result.addVisibilityBlock();
              }
            }
            return result;
          };
          Import.prototype.doEval = function(context) {
            var ruleset,
              registry,
              features = this.features && this.features.eval(context);

            if (this.options.plugin) {
              registry =
                context.frames[0] && context.frames[0].functionRegistry;
              if (registry && this.root && this.root.functions) {
                registry.addMultiple(this.root.functions);
              }
              return [];
            }

            if (this.skip) {
              if (typeof this.skip === "function") {
                this.skip = this.skip();
              }
              if (this.skip) {
                return [];
              }
            }
            if (this.options.inline) {
              var contents = new Anonymous(
                this.root,
                0,
                {
                  filename: this.importedFilename,
                  reference:
                    this.path.currentFileInfo &&
                    this.path.currentFileInfo.reference
                },
                true,
                true
              );

              return this.features
                ? new Media([contents], this.features.value)
                : [contents];
            } else if (this.css) {
              var newImport = new Import(
                this.evalPath(context),
                features,
                this.options,
                this.index
              );
              if (!newImport.css && this.error) {
                throw this.error;
              }
              return newImport;
            } else {
              ruleset = new Ruleset(null, this.root.rules.slice(0));
              ruleset.evalImports(context);

              return this.features
                ? new Media(ruleset.rules, this.features.value)
                : ruleset.rules;
            }
          };
          module.exports = Import;
        },
        {
          "./anonymous": 46,
          "./media": 66,
          "./node": 70,
          "./quoted": 73,
          "./ruleset": 76,
          "./url": 80
        }
      ],
      62: [
        function(require, module, exports) {
          var tree = {};

          tree.Node = require("./node");
          tree.Alpha = require("./alpha");
          tree.Color = require("./color");
          tree.Directive = require("./directive");
          tree.DetachedRuleset = require("./detached-ruleset");
          tree.Operation = require("./operation");
          tree.Dimension = require("./dimension");
          tree.Unit = require("./unit");
          tree.Keyword = require("./keyword");
          tree.Variable = require("./variable");
          tree.Ruleset = require("./ruleset");
          tree.Element = require("./element");
          tree.Attribute = require("./attribute");
          tree.Combinator = require("./combinator");
          tree.Selector = require("./selector");
          tree.Quoted = require("./quoted");
          tree.Expression = require("./expression");
          tree.Rule = require("./rule");
          tree.Call = require("./call");
          tree.URL = require("./url");
          tree.Import = require("./import");
          tree.mixin = {
            Call: require("./mixin-call"),
            Definition: require("./mixin-definition")
          };
          tree.Comment = require("./comment");
          tree.Anonymous = require("./anonymous");
          tree.Value = require("./value");
          tree.JavaScript = require("./javascript");
          tree.Assignment = require("./assignment");
          tree.Condition = require("./condition");
          tree.Paren = require("./paren");
          tree.Media = require("./media");
          tree.UnicodeDescriptor = require("./unicode-descriptor");
          tree.Negative = require("./negative");
          tree.Extend = require("./extend");
          tree.RulesetCall = require("./ruleset-call");

          module.exports = tree;
        },
        {
          "./alpha": 45,
          "./anonymous": 46,
          "./assignment": 47,
          "./attribute": 48,
          "./call": 49,
          "./color": 50,
          "./combinator": 51,
          "./comment": 52,
          "./condition": 53,
          "./detached-ruleset": 55,
          "./dimension": 56,
          "./directive": 57,
          "./element": 58,
          "./expression": 59,
          "./extend": 60,
          "./import": 61,
          "./javascript": 63,
          "./keyword": 65,
          "./media": 66,
          "./mixin-call": 67,
          "./mixin-definition": 68,
          "./negative": 69,
          "./node": 70,
          "./operation": 71,
          "./paren": 72,
          "./quoted": 73,
          "./rule": 74,
          "./ruleset": 76,
          "./ruleset-call": 75,
          "./selector": 77,
          "./unicode-descriptor": 78,
          "./unit": 79,
          "./url": 80,
          "./value": 81,
          "./variable": 82
        }
      ],
      63: [
        function(require, module, exports) {
          var JsEvalNode = require("./js-eval-node"),
            Dimension = require("./dimension"),
            Quoted = require("./quoted"),
            Anonymous = require("./anonymous");

          var JavaScript = function(string, escaped, index, currentFileInfo) {
            this.escaped = escaped;
            this.expression = string;
            this.index = index;
            this.currentFileInfo = currentFileInfo;
          };
          JavaScript.prototype = new JsEvalNode();
          JavaScript.prototype.type = "JavaScript";
          JavaScript.prototype.eval = function(context) {
            var result = this.evaluateJavaScript(this.expression, context);

            if (typeof result === "number") {
              return new Dimension(result);
            } else if (typeof result === "string") {
              return new Quoted(
                '"' + result + '"',
                result,
                this.escaped,
                this.index
              );
            } else if (Array.isArray(result)) {
              return new Anonymous(result.join(", "));
            } else {
              return new Anonymous(result);
            }
          };

          module.exports = JavaScript;
        },
        {
          "./anonymous": 46,
          "./dimension": 56,
          "./js-eval-node": 64,
          "./quoted": 73
        }
      ],
      64: [
        function(require, module, exports) {
          var Node = require("./node"),
            Variable = require("./variable");

          var JsEvalNode = function() {};
          JsEvalNode.prototype = new Node();

          JsEvalNode.prototype.evaluateJavaScript = function(
            expression,
            context
          ) {
            var result,
              that = this,
              evalContext = {};

            if (
              context.javascriptEnabled !== undefined &&
              !context.javascriptEnabled
            ) {
              throw {
                message: "You are using JavaScript, which has been disabled.",
                filename: this.currentFileInfo.filename,
                index: this.index
              };
            }

            expression = expression.replace(/@\{([\w-]+)\}/g, function(
              _,
              name
            ) {
              return that.jsify(
                new Variable("@" + name, that.index, that.currentFileInfo).eval(
                  context
                )
              );
            });

            try {
              expression = new Function("return (" + expression + ")");
            } catch (e) {
              throw {
                message:
                  "JavaScript evaluation error: " +
                  e.message +
                  " from `" +
                  expression +
                  "`",
                filename: this.currentFileInfo.filename,
                index: this.index
              };
            }

            var variables = context.frames[0].variables();
            for (var k in variables) {
              if (variables.hasOwnProperty(k)) {
                /*jshint loopfunc:true */
                evalContext[k.slice(1)] = {
                  value: variables[k].value,
                  toJS: function() {
                    return this.value.eval(context).toCSS();
                  }
                };
              }
            }

            try {
              result = expression.call(evalContext);
            } catch (e) {
              throw {
                message:
                  "JavaScript evaluation error: '" +
                  e.name +
                  ": " +
                  e.message.replace(/["]/g, "'") +
                  "'",
                filename: this.currentFileInfo.filename,
                index: this.index
              };
            }
            return result;
          };
          JsEvalNode.prototype.jsify = function(obj) {
            if (Array.isArray(obj.value) && obj.value.length > 1) {
              return (
                "[" +
                obj.value
                  .map(function(v) {
                    return v.toCSS();
                  })
                  .join(", ") +
                "]"
              );
            } else {
              return obj.toCSS();
            }
          };

          module.exports = JsEvalNode;
        },
        { "./node": 70, "./variable": 82 }
      ],
      65: [
        function(require, module, exports) {
          var Node = require("./node");

          var Keyword = function(value) {
            this.value = value;
          };
          Keyword.prototype = new Node();
          Keyword.prototype.type = "Keyword";
          Keyword.prototype.genCSS = function(context, output) {
            if (this.value === "%") {
              throw { type: "Syntax", message: "Invalid % without number" };
            }
            output.add(this.value);
          };

          Keyword.True = new Keyword("true");
          Keyword.False = new Keyword("false");

          module.exports = Keyword;
        },
        { "./node": 70 }
      ],
      66: [
        function(require, module, exports) {
          var Ruleset = require("./ruleset"),
            Value = require("./value"),
            Selector = require("./selector"),
            Anonymous = require("./anonymous"),
            Expression = require("./expression"),
            Directive = require("./directive");

          var Media = function(
            value,
            features,
            index,
            currentFileInfo,
            visibilityInfo
          ) {
            this.index = index;
            this.currentFileInfo = currentFileInfo;

            var selectors = new Selector(
              [],
              null,
              null,
              this.index,
              this.currentFileInfo
            ).createEmptySelectors();

            this.features = new Value(features);
            this.rules = [new Ruleset(selectors, value)];
            this.rules[0].allowImports = true;
            this.copyVisibilityInfo(visibilityInfo);
            this.allowRoot = true;
          };
          Media.prototype = new Directive();
          Media.prototype.type = "Media";
          Media.prototype.isRulesetLike = true;
          Media.prototype.accept = function(visitor) {
            if (this.features) {
              this.features = visitor.visit(this.features);
            }
            if (this.rules) {
              this.rules = visitor.visitArray(this.rules);
            }
          };
          Media.prototype.genCSS = function(context, output) {
            output.add("@media ", this.currentFileInfo, this.index);
            this.features.genCSS(context, output);
            this.outputRuleset(context, output, this.rules);
          };
          Media.prototype.eval = function(context) {
            if (!context.mediaBlocks) {
              context.mediaBlocks = [];
              context.mediaPath = [];
            }

            var media = new Media(
              null,
              [],
              this.index,
              this.currentFileInfo,
              this.visibilityInfo()
            );
            if (this.debugInfo) {
              this.rules[0].debugInfo = this.debugInfo;
              media.debugInfo = this.debugInfo;
            }
            var strictMathBypass = false;
            if (!context.strictMath) {
              strictMathBypass = true;
              context.strictMath = true;
            }
            try {
              media.features = this.features.eval(context);
            } finally {
              if (strictMathBypass) {
                context.strictMath = false;
              }
            }

            context.mediaPath.push(media);
            context.mediaBlocks.push(media);

            this.rules[0].functionRegistry = context.frames[0].functionRegistry.inherit();
            context.frames.unshift(this.rules[0]);
            media.rules = [this.rules[0].eval(context)];
            context.frames.shift();

            context.mediaPath.pop();

            return context.mediaPath.length === 0
              ? media.evalTop(context)
              : media.evalNested(context);
          };
          Media.prototype.evalTop = function(context) {
            var result = this;

            // Render all dependent Media blocks.
            if (context.mediaBlocks.length > 1) {
              var selectors = new Selector(
                [],
                null,
                null,
                this.index,
                this.currentFileInfo
              ).createEmptySelectors();
              result = new Ruleset(selectors, context.mediaBlocks);
              result.multiMedia = true;
              result.copyVisibilityInfo(this.visibilityInfo());
            }

            delete context.mediaBlocks;
            delete context.mediaPath;

            return result;
          };
          Media.prototype.evalNested = function(context) {
            var i,
              value,
              path = context.mediaPath.concat([this]);

            // Extract the media-query conditions separated with `,` (OR).
            for (i = 0; i < path.length; i++) {
              value =
                path[i].features instanceof Value
                  ? path[i].features.value
                  : path[i].features;
              path[i] = Array.isArray(value) ? value : [value];
            }

            // Trace all permutations to generate the resulting media-query.
            //
            // (a, b and c) with nested (d, e) ->
            //    a and d
            //    a and e
            //    b and c and d
            //    b and c and e
            this.features = new Value(
              this.permute(path).map(function(path) {
                path = path.map(function(fragment) {
                  return fragment.toCSS ? fragment : new Anonymous(fragment);
                });

                for (i = path.length - 1; i > 0; i--) {
                  path.splice(i, 0, new Anonymous("and"));
                }

                return new Expression(path);
              })
            );

            // Fake a tree-node that doesn't output anything.
            return new Ruleset([], []);
          };
          Media.prototype.permute = function(arr) {
            if (arr.length === 0) {
              return [];
            } else if (arr.length === 1) {
              return arr[0];
            } else {
              var result = [];
              var rest = this.permute(arr.slice(1));
              for (var i = 0; i < rest.length; i++) {
                for (var j = 0; j < arr[0].length; j++) {
                  result.push([arr[0][j]].concat(rest[i]));
                }
              }
              return result;
            }
          };
          Media.prototype.bubbleSelectors = function(selectors) {
            if (!selectors) {
              return;
            }
            this.rules = [new Ruleset(selectors.slice(0), [this.rules[0]])];
          };
          module.exports = Media;
        },
        {
          "./anonymous": 46,
          "./directive": 57,
          "./expression": 59,
          "./ruleset": 76,
          "./selector": 77,
          "./value": 81
        }
      ],
      67: [
        function(require, module, exports) {
          var Node = require("./node"),
            Selector = require("./selector"),
            MixinDefinition = require("./mixin-definition"),
            defaultFunc = require("../functions/default");

          var MixinCall = function(
            elements,
            args,
            index,
            currentFileInfo,
            important
          ) {
            this.selector = new Selector(elements);
            this.arguments = args || [];
            this.index = index;
            this.currentFileInfo = currentFileInfo;
            this.important = important;
            this.allowRoot = true;
          };
          MixinCall.prototype = new Node();
          MixinCall.prototype.type = "MixinCall";
          MixinCall.prototype.accept = function(visitor) {
            if (this.selector) {
              this.selector = visitor.visit(this.selector);
            }
            if (this.arguments.length) {
              this.arguments = visitor.visitArray(this.arguments);
            }
          };
          MixinCall.prototype.eval = function(context) {
            var mixins,
              mixin,
              mixinPath,
              args = [],
              arg,
              argValue,
              rules = [],
              match = false,
              i,
              m,
              f,
              isRecursive,
              isOneFound,
              candidates = [],
              candidate,
              conditionResult = [],
              defaultResult,
              defFalseEitherCase = -1,
              defNone = 0,
              defTrue = 1,
              defFalse = 2,
              count,
              originalRuleset,
              noArgumentsFilter;

            function calcDefGroup(mixin, mixinPath) {
              var f, p, namespace;

              for (f = 0; f < 2; f++) {
                conditionResult[f] = true;
                defaultFunc.value(f);
                for (p = 0; p < mixinPath.length && conditionResult[f]; p++) {
                  namespace = mixinPath[p];
                  if (namespace.matchCondition) {
                    conditionResult[f] =
                      conditionResult[f] &&
                      namespace.matchCondition(null, context);
                  }
                }
                if (mixin.matchCondition) {
                  conditionResult[f] =
                    conditionResult[f] && mixin.matchCondition(args, context);
                }
              }
              if (conditionResult[0] || conditionResult[1]) {
                if (conditionResult[0] != conditionResult[1]) {
                  return conditionResult[1] ? defTrue : defFalse;
                }

                return defNone;
              }
              return defFalseEitherCase;
            }

            for (i = 0; i < this.arguments.length; i++) {
              arg = this.arguments[i];
              argValue = arg.value.eval(context);
              if (arg.expand && Array.isArray(argValue.value)) {
                argValue = argValue.value;
                for (m = 0; m < argValue.length; m++) {
                  args.push({ value: argValue[m] });
                }
              } else {
                args.push({ name: arg.name, value: argValue });
              }
            }

            noArgumentsFilter = function(rule) {
              return rule.matchArgs(null, context);
            };

            for (i = 0; i < context.frames.length; i++) {
              if (
                (mixins = context.frames[i].find(
                  this.selector,
                  null,
                  noArgumentsFilter
                )).length > 0
              ) {
                isOneFound = true;

                // To make `default()` function independent of definition order we have two "subpasses" here.
                // At first we evaluate each guard *twice* (with `default() == true` and `default() == false`),
                // and build candidate list with corresponding flags. Then, when we know all possible matches,
                // we make a final decision.

                for (m = 0; m < mixins.length; m++) {
                  mixin = mixins[m].rule;
                  mixinPath = mixins[m].path;
                  isRecursive = false;
                  for (f = 0; f < context.frames.length; f++) {
                    if (
                      !(mixin instanceof MixinDefinition) &&
                      mixin ===
                        (context.frames[f].originalRuleset || context.frames[f])
                    ) {
                      isRecursive = true;
                      break;
                    }
                  }
                  if (isRecursive) {
                    continue;
                  }

                  if (mixin.matchArgs(args, context)) {
                    candidate = {
                      mixin: mixin,
                      group: calcDefGroup(mixin, mixinPath)
                    };

                    if (candidate.group !== defFalseEitherCase) {
                      candidates.push(candidate);
                    }

                    match = true;
                  }
                }

                defaultFunc.reset();

                count = [0, 0, 0];
                for (m = 0; m < candidates.length; m++) {
                  count[candidates[m].group]++;
                }

                if (count[defNone] > 0) {
                  defaultResult = defFalse;
                } else {
                  defaultResult = defTrue;
                  if (count[defTrue] + count[defFalse] > 1) {
                    throw {
                      type: "Runtime",
                      message:
                        "Ambiguous use of `default()` found when matching for `" +
                        this.format(args) +
                        "`",
                      index: this.index,
                      filename: this.currentFileInfo.filename
                    };
                  }
                }

                for (m = 0; m < candidates.length; m++) {
                  candidate = candidates[m].group;
                  if (candidate === defNone || candidate === defaultResult) {
                    try {
                      mixin = candidates[m].mixin;
                      if (!(mixin instanceof MixinDefinition)) {
                        originalRuleset = mixin.originalRuleset || mixin;
                        mixin = new MixinDefinition(
                          "",
                          [],
                          mixin.rules,
                          null,
                          false,
                          null,
                          originalRuleset.visibilityInfo()
                        );
                        mixin.originalRuleset = originalRuleset;
                      }
                      var newRules = mixin.evalCall(
                        context,
                        args,
                        this.important
                      ).rules;
                      this._setVisibilityToReplacement(newRules);
                      Array.prototype.push.apply(rules, newRules);
                    } catch (e) {
                      throw {
                        message: e.message,
                        index: this.index,
                        filename: this.currentFileInfo.filename,
                        stack: e.stack
                      };
                    }
                  }
                }

                if (match) {
                  return rules;
                }
              }
            }
            if (isOneFound) {
              throw {
                type: "Runtime",
                message:
                  "No matching definition was found for `" +
                  this.format(args) +
                  "`",
                index: this.index,
                filename: this.currentFileInfo.filename
              };
            } else {
              throw {
                type: "Name",
                message: this.selector.toCSS().trim() + " is undefined",
                index: this.index,
                filename: this.currentFileInfo.filename
              };
            }
          };

          MixinCall.prototype._setVisibilityToReplacement = function(
            replacement
          ) {
            var i, rule;
            if (this.blocksVisibility()) {
              for (i = 0; i < replacement.length; i++) {
                rule = replacement[i];
                rule.addVisibilityBlock();
              }
            }
          };
          MixinCall.prototype.format = function(args) {
            return (
              this.selector.toCSS().trim() +
              "(" +
              (args
                ? args
                    .map(function(a) {
                      var argValue = "";
                      if (a.name) {
                        argValue += a.name + ":";
                      }
                      if (a.value.toCSS) {
                        argValue += a.value.toCSS();
                      } else {
                        argValue += "???";
                      }
                      return argValue;
                    })
                    .join(", ")
                : "") +
              ")"
            );
          };
          module.exports = MixinCall;
        },
        {
          "../functions/default": 20,
          "./mixin-definition": 68,
          "./node": 70,
          "./selector": 77
        }
      ],
      68: [
        function(require, module, exports) {
          var Selector = require("./selector"),
            Element = require("./element"),
            Ruleset = require("./ruleset"),
            Rule = require("./rule"),
            Expression = require("./expression"),
            contexts = require("../contexts");

          var Definition = function(
            name,
            params,
            rules,
            condition,
            variadic,
            frames,
            visibilityInfo
          ) {
            this.name = name;
            this.selectors = [
              new Selector([
                new Element(null, name, this.index, this.currentFileInfo)
              ])
            ];
            this.params = params;
            this.condition = condition;
            this.variadic = variadic;
            this.arity = params.length;
            this.rules = rules;
            this._lookups = {};
            var optionalParameters = [];
            this.required = params.reduce(function(count, p) {
              if (!p.name || (p.name && !p.value)) {
                return count + 1;
              } else {
                optionalParameters.push(p.name);
                return count;
              }
            }, 0);
            this.optionalParameters = optionalParameters;
            this.frames = frames;
            this.copyVisibilityInfo(visibilityInfo);
            this.allowRoot = true;
          };
          Definition.prototype = new Ruleset();
          Definition.prototype.type = "MixinDefinition";
          Definition.prototype.evalFirst = true;
          Definition.prototype.accept = function(visitor) {
            if (this.params && this.params.length) {
              this.params = visitor.visitArray(this.params);
            }
            this.rules = visitor.visitArray(this.rules);
            if (this.condition) {
              this.condition = visitor.visit(this.condition);
            }
          };
          Definition.prototype.evalParams = function(
            context,
            mixinEnv,
            args,
            evaldArguments
          ) {
            /*jshint boss:true */
            var frame = new Ruleset(null, null),
              varargs,
              arg,
              params = this.params.slice(0),
              i,
              j,
              val,
              name,
              isNamedFound,
              argIndex,
              argsLength = 0;

            if (
              mixinEnv.frames &&
              mixinEnv.frames[0] &&
              mixinEnv.frames[0].functionRegistry
            ) {
              frame.functionRegistry = mixinEnv.frames[0].functionRegistry.inherit();
            }
            mixinEnv = new contexts.Eval(
              mixinEnv,
              [frame].concat(mixinEnv.frames)
            );

            if (args) {
              args = args.slice(0);
              argsLength = args.length;

              for (i = 0; i < argsLength; i++) {
                arg = args[i];
                if ((name = arg && arg.name)) {
                  isNamedFound = false;
                  for (j = 0; j < params.length; j++) {
                    if (!evaldArguments[j] && name === params[j].name) {
                      evaldArguments[j] = arg.value.eval(context);
                      frame.prependRule(
                        new Rule(name, arg.value.eval(context))
                      );
                      isNamedFound = true;
                      break;
                    }
                  }
                  if (isNamedFound) {
                    args.splice(i, 1);
                    i--;
                    continue;
                  } else {
                    throw {
                      type: "Runtime",
                      message:
                        "Named argument for " +
                        this.name +
                        " " +
                        args[i].name +
                        " not found"
                    };
                  }
                }
              }
            }
            argIndex = 0;
            for (i = 0; i < params.length; i++) {
              if (evaldArguments[i]) {
                continue;
              }

              arg = args && args[argIndex];

              if ((name = params[i].name)) {
                if (params[i].variadic) {
                  varargs = [];
                  for (j = argIndex; j < argsLength; j++) {
                    varargs.push(args[j].value.eval(context));
                  }
                  frame.prependRule(
                    new Rule(name, new Expression(varargs).eval(context))
                  );
                } else {
                  val = arg && arg.value;
                  if (val) {
                    val = val.eval(context);
                  } else if (params[i].value) {
                    val = params[i].value.eval(mixinEnv);
                    frame.resetCache();
                  } else {
                    throw {
                      type: "Runtime",
                      message:
                        "wrong number of arguments for " +
                        this.name +
                        " (" +
                        argsLength +
                        " for " +
                        this.arity +
                        ")"
                    };
                  }

                  frame.prependRule(new Rule(name, val));
                  evaldArguments[i] = val;
                }
              }

              if (params[i].variadic && args) {
                for (j = argIndex; j < argsLength; j++) {
                  evaldArguments[j] = args[j].value.eval(context);
                }
              }
              argIndex++;
            }

            return frame;
          };
          Definition.prototype.makeImportant = function() {
            var rules = !this.rules
              ? this.rules
              : this.rules.map(function(r) {
                  if (r.makeImportant) {
                    return r.makeImportant(true);
                  } else {
                    return r;
                  }
                });
            var result = new Definition(
              this.name,
              this.params,
              rules,
              this.condition,
              this.variadic,
              this.frames
            );
            return result;
          };
          Definition.prototype.eval = function(context) {
            return new Definition(
              this.name,
              this.params,
              this.rules,
              this.condition,
              this.variadic,
              this.frames || context.frames.slice(0)
            );
          };
          Definition.prototype.evalCall = function(context, args, important) {
            var _arguments = [],
              mixinFrames = this.frames
                ? this.frames.concat(context.frames)
                : context.frames,
              frame = this.evalParams(
                context,
                new contexts.Eval(context, mixinFrames),
                args,
                _arguments
              ),
              rules,
              ruleset;

            frame.prependRule(
              new Rule("@arguments", new Expression(_arguments).eval(context))
            );

            rules = this.rules.slice(0);

            ruleset = new Ruleset(null, rules);
            ruleset.originalRuleset = this;
            ruleset = ruleset.eval(
              new contexts.Eval(context, [this, frame].concat(mixinFrames))
            );
            if (important) {
              ruleset = ruleset.makeImportant();
            }
            return ruleset;
          };
          Definition.prototype.matchCondition = function(args, context) {
            if (
              this.condition &&
              !this.condition.eval(
                new contexts.Eval(
                  context,
                  [
                    this.evalParams(
                      context /* the parameter variables*/,
                      new contexts.Eval(
                        context,
                        this.frames
                          ? this.frames.concat(context.frames)
                          : context.frames
                      ),
                      args,
                      []
                    )
                  ]
                    .concat(this.frames || []) // the parent namespace/mixin frames
                    .concat(context.frames)
                )
              )
            ) {
              // the current environment frames
              return false;
            }
            return true;
          };
          Definition.prototype.matchArgs = function(args, context) {
            var allArgsCnt = (args && args.length) || 0,
              len,
              optionalParameters = this.optionalParameters;
            var requiredArgsCnt = !args
              ? 0
              : args.reduce(function(count, p) {
                  if (optionalParameters.indexOf(p.name) < 0) {
                    return count + 1;
                  } else {
                    return count;
                  }
                }, 0);

            if (!this.variadic) {
              if (requiredArgsCnt < this.required) {
                return false;
              }
              if (allArgsCnt > this.params.length) {
                return false;
              }
            } else {
              if (requiredArgsCnt < this.required - 1) {
                return false;
              }
            }

            // check patterns
            len = Math.min(requiredArgsCnt, this.arity);

            for (var i = 0; i < len; i++) {
              if (!this.params[i].name && !this.params[i].variadic) {
                if (
                  args[i].value.eval(context).toCSS() !=
                  this.params[i].value.eval(context).toCSS()
                ) {
                  return false;
                }
              }
            }
            return true;
          };
          module.exports = Definition;
        },
        {
          "../contexts": 11,
          "./element": 58,
          "./expression": 59,
          "./rule": 74,
          "./ruleset": 76,
          "./selector": 77
        }
      ],
      69: [
        function(require, module, exports) {
          var Node = require("./node"),
            Operation = require("./operation"),
            Dimension = require("./dimension");

          var Negative = function(node) {
            this.value = node;
          };
          Negative.prototype = new Node();
          Negative.prototype.type = "Negative";
          Negative.prototype.genCSS = function(context, output) {
            output.add("-");
            this.value.genCSS(context, output);
          };
          Negative.prototype.eval = function(context) {
            if (context.isMathOn()) {
              return new Operation("*", [new Dimension(-1), this.value]).eval(
                context
              );
            }
            return new Negative(this.value.eval(context));
          };
          module.exports = Negative;
        },
        { "./dimension": 56, "./node": 70, "./operation": 71 }
      ],
      70: [
        function(require, module, exports) {
          var Node = function() {};
          Node.prototype.toCSS = function(context) {
            var strs = [];
            this.genCSS(context, {
              add: function(chunk, fileInfo, index) {
                strs.push(chunk);
              },
              isEmpty: function() {
                return strs.length === 0;
              }
            });
            return strs.join("");
          };
          Node.prototype.genCSS = function(context, output) {
            output.add(this.value);
          };
          Node.prototype.accept = function(visitor) {
            this.value = visitor.visit(this.value);
          };
          Node.prototype.eval = function() {
            return this;
          };
          Node.prototype._operate = function(context, op, a, b) {
            switch (op) {
              case "+":
                return a + b;
              case "-":
                return a - b;
              case "*":
                return a * b;
              case "/":
                return a / b;
            }
          };
          Node.prototype.fround = function(context, value) {
            var precision = context && context.numPrecision;
            //add "epsilon" to ensure numbers like 1.000000005 (represented as 1.000000004999....) are properly rounded...
            return precision == null
              ? value
              : Number((value + 2e-16).toFixed(precision));
          };
          Node.compare = function(a, b) {
            /* returns:
     -1: a < b
     0: a = b
     1: a > b
     and *any* other value for a != b (e.g. undefined, NaN, -2 etc.) */

            if (
              a.compare &&
              // for "symmetric results" force toCSS-based comparison
              // of Quoted or Anonymous if either value is one of those
              !(b.type === "Quoted" || b.type === "Anonymous")
            ) {
              return a.compare(b);
            } else if (b.compare) {
              return -b.compare(a);
            } else if (a.type !== b.type) {
              return undefined;
            }

            a = a.value;
            b = b.value;
            if (!Array.isArray(a)) {
              return a === b ? 0 : undefined;
            }
            if (a.length !== b.length) {
              return undefined;
            }
            for (var i = 0; i < a.length; i++) {
              if (Node.compare(a[i], b[i]) !== 0) {
                return undefined;
              }
            }
            return 0;
          };

          Node.numericCompare = function(a, b) {
            return a < b ? -1 : a === b ? 0 : a > b ? 1 : undefined;
          };
          // Returns true if this node represents root of ast imported by reference
          Node.prototype.blocksVisibility = function() {
            if (this.visibilityBlocks == null) {
              this.visibilityBlocks = 0;
            }
            return this.visibilityBlocks !== 0;
          };
          Node.prototype.addVisibilityBlock = function() {
            if (this.visibilityBlocks == null) {
              this.visibilityBlocks = 0;
            }
            this.visibilityBlocks = this.visibilityBlocks + 1;
          };
          Node.prototype.removeVisibilityBlock = function() {
            if (this.visibilityBlocks == null) {
              this.visibilityBlocks = 0;
            }
            this.visibilityBlocks = this.visibilityBlocks - 1;
          };
          //Turns on node visibility - if called node will be shown in output regardless
          //of whether it comes from import by reference or not
          Node.prototype.ensureVisibility = function() {
            this.nodeVisible = true;
          };
          //Turns off node visibility - if called node will NOT be shown in output regardless
          //of whether it comes from import by reference or not
          Node.prototype.ensureInvisibility = function() {
            this.nodeVisible = false;
          };
          // return values:
          // false - the node must not be visible
          // true - the node must be visible
          // undefined or null - the node has the same visibility as its parent
          Node.prototype.isVisible = function() {
            return this.nodeVisible;
          };
          Node.prototype.visibilityInfo = function() {
            return {
              visibilityBlocks: this.visibilityBlocks,
              nodeVisible: this.nodeVisible
            };
          };
          Node.prototype.copyVisibilityInfo = function(info) {
            if (!info) {
              return;
            }
            this.visibilityBlocks = info.visibilityBlocks;
            this.nodeVisible = info.nodeVisible;
          };
          module.exports = Node;
        },
        {}
      ],
      71: [
        function(require, module, exports) {
          var Node = require("./node"),
            Color = require("./color"),
            Dimension = require("./dimension");

          var Operation = function(op, operands, isSpaced) {
            this.op = op.trim();
            this.operands = operands;
            this.isSpaced = isSpaced;
          };
          Operation.prototype = new Node();
          Operation.prototype.type = "Operation";
          Operation.prototype.accept = function(visitor) {
            this.operands = visitor.visit(this.operands);
          };
          Operation.prototype.eval = function(context) {
            var a = this.operands[0].eval(context),
              b = this.operands[1].eval(context);

            if (context.isMathOn()) {
              if (a instanceof Dimension && b instanceof Color) {
                a = a.toColor();
              }
              if (b instanceof Dimension && a instanceof Color) {
                b = b.toColor();
              }
              if (!a.operate) {
                throw {
                  type: "Operation",
                  message: "Operation on an invalid type"
                };
              }

              return a.operate(context, this.op, b);
            } else {
              return new Operation(this.op, [a, b], this.isSpaced);
            }
          };
          Operation.prototype.genCSS = function(context, output) {
            this.operands[0].genCSS(context, output);
            if (this.isSpaced) {
              output.add(" ");
            }
            output.add(this.op);
            if (this.isSpaced) {
              output.add(" ");
            }
            this.operands[1].genCSS(context, output);
          };

          module.exports = Operation;
        },
        { "./color": 50, "./dimension": 56, "./node": 70 }
      ],
      72: [
        function(require, module, exports) {
          var Node = require("./node");

          var Paren = function(node) {
            this.value = node;
          };
          Paren.prototype = new Node();
          Paren.prototype.type = "Paren";
          Paren.prototype.genCSS = function(context, output) {
            output.add("(");
            this.value.genCSS(context, output);
            output.add(")");
          };
          Paren.prototype.eval = function(context) {
            return new Paren(this.value.eval(context));
          };
          module.exports = Paren;
        },
        { "./node": 70 }
      ],
      73: [
        function(require, module, exports) {
          var Node = require("./node"),
            JsEvalNode = require("./js-eval-node"),
            Variable = require("./variable");

          var Quoted = function(str, content, escaped, index, currentFileInfo) {
            this.escaped = escaped == null ? true : escaped;
            this.value = content || "";
            this.quote = str.charAt(0);
            this.index = index;
            this.currentFileInfo = currentFileInfo;
          };
          Quoted.prototype = new JsEvalNode();
          Quoted.prototype.type = "Quoted";
          Quoted.prototype.genCSS = function(context, output) {
            if (!this.escaped) {
              output.add(this.quote, this.currentFileInfo, this.index);
            }
            output.add(this.value);
            if (!this.escaped) {
              output.add(this.quote);
            }
          };
          Quoted.prototype.containsVariables = function() {
            return this.value.match(/(`([^`]+)`)|@\{([\w-]+)\}/);
          };
          Quoted.prototype.eval = function(context) {
            var that = this,
              value = this.value;
            var javascriptReplacement = function(_, exp) {
              return String(that.evaluateJavaScript(exp, context));
            };
            var interpolationReplacement = function(_, name) {
              var v = new Variable(
                "@" + name,
                that.index,
                that.currentFileInfo
              ).eval(context, true);
              return v instanceof Quoted ? v.value : v.toCSS();
            };

            function iterativeReplace(value, regexp, replacementFnc) {
              var evaluatedValue = value;
              do {
                value = evaluatedValue;
                evaluatedValue = value.replace(regexp, replacementFnc);
              } while (value !== evaluatedValue);
              return evaluatedValue;
            }

            value = iterativeReplace(
              value,
              /`([^`]+)`/g,
              javascriptReplacement
            );
            value = iterativeReplace(
              value,
              /@\{([\w-]+)\}/g,
              interpolationReplacement
            );
            return new Quoted(
              this.quote + value + this.quote,
              value,
              this.escaped,
              this.index,
              this.currentFileInfo
            );
          };
          Quoted.prototype.compare = function(other) {
            // when comparing quoted strings allow the quote to differ
            if (other.type === "Quoted" && !this.escaped && !other.escaped) {
              return Node.numericCompare(this.value, other.value);
            } else {
              return other.toCSS && this.toCSS() === other.toCSS()
                ? 0
                : undefined;
            }
          };
          module.exports = Quoted;
        },
        { "./js-eval-node": 64, "./node": 70, "./variable": 82 }
      ],
      74: [
        function(require, module, exports) {
          var Node = require("./node"),
            Value = require("./value"),
            Keyword = require("./keyword");

          var Rule = function(
            name,
            value,
            important,
            merge,
            index,
            currentFileInfo,
            inline,
            variable
          ) {
            this.name = name;
            this.value = value instanceof Node ? value : new Value([value]); //value instanceof tree.Value || value instanceof tree.Ruleset ??
            this.important = important ? " " + important.trim() : "";
            this.merge = merge;
            this.index = index;
            this.currentFileInfo = currentFileInfo;
            this.inline = inline || false;
            this.variable =
              variable !== undefined
                ? variable
                : name.charAt && name.charAt(0) === "@";
            this.allowRoot = true;
          };

          function evalName(context, name) {
            var value = "",
              i,
              n = name.length,
              output = {
                add: function(s) {
                  value += s;
                }
              };
            for (i = 0; i < n; i++) {
              name[i].eval(context).genCSS(context, output);
            }
            return value;
          }

          Rule.prototype = new Node();
          Rule.prototype.type = "Rule";
          Rule.prototype.genCSS = function(context, output) {
            output.add(
              this.name + (context.compress ? ":" : ": "),
              this.currentFileInfo,
              this.index
            );
            try {
              this.value.genCSS(context, output);
            } catch (e) {
              e.index = this.index;
              e.filename = this.currentFileInfo.filename;
              throw e;
            }
            output.add(
              this.important +
                (this.inline || (context.lastRule && context.compress)
                  ? ""
                  : ";"),
              this.currentFileInfo,
              this.index
            );
          };
          Rule.prototype.eval = function(context) {
            var strictMathBypass = false,
              name = this.name,
              evaldValue,
              variable = this.variable;
            if (typeof name !== "string") {
              // expand 'primitive' name directly to get
              // things faster (~10% for benchmark.less):
              name =
                name.length === 1 && name[0] instanceof Keyword
                  ? name[0].value
                  : evalName(context, name);
              variable = false; // never treat expanded interpolation as new variable name
            }
            if (name === "font" && !context.strictMath) {
              strictMathBypass = true;
              context.strictMath = true;
            }
            try {
              context.importantScope.push({});
              evaldValue = this.value.eval(context);

              if (!this.variable && evaldValue.type === "DetachedRuleset") {
                throw {
                  message: "Rulesets cannot be evaluated on a property.",
                  index: this.index,
                  filename: this.currentFileInfo.filename
                };
              }
              var important = this.important,
                importantResult = context.importantScope.pop();
              if (!important && importantResult.important) {
                important = importantResult.important;
              }

              return new Rule(
                name,
                evaldValue,
                important,
                this.merge,
                this.index,
                this.currentFileInfo,
                this.inline,
                variable
              );
            } catch (e) {
              if (typeof e.index !== "number") {
                e.index = this.index;
                e.filename = this.currentFileInfo.filename;
              }
              throw e;
            } finally {
              if (strictMathBypass) {
                context.strictMath = false;
              }
            }
          };
          Rule.prototype.makeImportant = function() {
            return new Rule(
              this.name,
              this.value,
              "!important",
              this.merge,
              this.index,
              this.currentFileInfo,
              this.inline
            );
          };

          module.exports = Rule;
        },
        { "./keyword": 65, "./node": 70, "./value": 81 }
      ],
      75: [
        function(require, module, exports) {
          var Node = require("./node"),
            Variable = require("./variable");

          var RulesetCall = function(variable) {
            this.variable = variable;
            this.allowRoot = true;
          };
          RulesetCall.prototype = new Node();
          RulesetCall.prototype.type = "RulesetCall";
          RulesetCall.prototype.eval = function(context) {
            var detachedRuleset = new Variable(this.variable).eval(context);
            return detachedRuleset.callEval(context);
          };
          module.exports = RulesetCall;
        },
        { "./node": 70, "./variable": 82 }
      ],
      76: [
        function(require, module, exports) {
          var Node = require("./node"),
            Rule = require("./rule"),
            Selector = require("./selector"),
            Element = require("./element"),
            Paren = require("./paren"),
            contexts = require("../contexts"),
            globalFunctionRegistry = require("../functions/function-registry"),
            defaultFunc = require("../functions/default"),
            getDebugInfo = require("./debug-info");

          var Ruleset = function(
            selectors,
            rules,
            strictImports,
            visibilityInfo
          ) {
            this.selectors = selectors;
            this.rules = rules;
            this._lookups = {};
            this.strictImports = strictImports;
            this.copyVisibilityInfo(visibilityInfo);
            this.allowRoot = true;
          };
          Ruleset.prototype = new Node();
          Ruleset.prototype.type = "Ruleset";
          Ruleset.prototype.isRuleset = true;
          Ruleset.prototype.isRulesetLike = true;
          Ruleset.prototype.accept = function(visitor) {
            if (this.paths) {
              this.paths = visitor.visitArray(this.paths, true);
            } else if (this.selectors) {
              this.selectors = visitor.visitArray(this.selectors);
            }
            if (this.rules && this.rules.length) {
              this.rules = visitor.visitArray(this.rules);
            }
          };
          Ruleset.prototype.eval = function(context) {
            var thisSelectors = this.selectors,
              selectors,
              selCnt,
              selector,
              i,
              hasOnePassingSelector = false;

            if (thisSelectors && (selCnt = thisSelectors.length)) {
              selectors = [];
              defaultFunc.error({
                type: "Syntax",
                message:
                  "it is currently only allowed in parametric mixin guards,"
              });
              for (i = 0; i < selCnt; i++) {
                selector = thisSelectors[i].eval(context);
                selectors.push(selector);
                if (selector.evaldCondition) {
                  hasOnePassingSelector = true;
                }
              }
              defaultFunc.reset();
            } else {
              hasOnePassingSelector = true;
            }

            var rules = this.rules ? this.rules.slice(0) : null,
              ruleset = new Ruleset(
                selectors,
                rules,
                this.strictImports,
                this.visibilityInfo()
              ),
              rule,
              subRule;

            ruleset.originalRuleset = this;
            ruleset.root = this.root;
            ruleset.firstRoot = this.firstRoot;
            ruleset.allowImports = this.allowImports;

            if (this.debugInfo) {
              ruleset.debugInfo = this.debugInfo;
            }

            if (!hasOnePassingSelector) {
              rules.length = 0;
            }

            // inherit a function registry from the frames stack when possible;
            // otherwise from the global registry
            ruleset.functionRegistry = (function(frames) {
              var i = 0,
                n = frames.length,
                found;
              for (; i !== n; ++i) {
                found = frames[i].functionRegistry;
                if (found) {
                  return found;
                }
              }
              return globalFunctionRegistry;
            })(context.frames).inherit();

            // push the current ruleset to the frames stack
            var ctxFrames = context.frames;
            ctxFrames.unshift(ruleset);

            // currrent selectors
            var ctxSelectors = context.selectors;
            if (!ctxSelectors) {
              context.selectors = ctxSelectors = [];
            }
            ctxSelectors.unshift(this.selectors);

            // Evaluate imports
            if (
              ruleset.root ||
              ruleset.allowImports ||
              !ruleset.strictImports
            ) {
              ruleset.evalImports(context);
            }

            // Store the frames around mixin definitions,
            // so they can be evaluated like closures when the time comes.
            var rsRules = ruleset.rules,
              rsRuleCnt = rsRules ? rsRules.length : 0;
            for (i = 0; i < rsRuleCnt; i++) {
              if (rsRules[i].evalFirst) {
                rsRules[i] = rsRules[i].eval(context);
              }
            }

            var mediaBlockCount =
              (context.mediaBlocks && context.mediaBlocks.length) || 0;

            // Evaluate mixin calls.
            for (i = 0; i < rsRuleCnt; i++) {
              if (rsRules[i].type === "MixinCall") {
                /*jshint loopfunc:true */
                rules = rsRules[i].eval(context).filter(function(r) {
                  if (r instanceof Rule && r.variable) {
                    // do not pollute the scope if the variable is
                    // already there. consider returning false here
                    // but we need a way to "return" variable from mixins
                    return !ruleset.variable(r.name);
                  }
                  return true;
                });
                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
                rsRuleCnt += rules.length - 1;
                i += rules.length - 1;
                ruleset.resetCache();
              } else if (rsRules[i].type === "RulesetCall") {
                /*jshint loopfunc:true */
                rules = rsRules[i].eval(context).rules.filter(function(r) {
                  if (r instanceof Rule && r.variable) {
                    // do not pollute the scope at all
                    return false;
                  }
                  return true;
                });
                rsRules.splice.apply(rsRules, [i, 1].concat(rules));
                rsRuleCnt += rules.length - 1;
                i += rules.length - 1;
                ruleset.resetCache();
              }
            }

            // Evaluate everything else
            for (i = 0; i < rsRules.length; i++) {
              rule = rsRules[i];
              if (!rule.evalFirst) {
                rsRules[i] = rule = rule.eval ? rule.eval(context) : rule;
              }
            }

            // Evaluate everything else
            for (i = 0; i < rsRules.length; i++) {
              rule = rsRules[i];
              // for rulesets, check if it is a css guard and can be removed
              if (
                rule instanceof Ruleset &&
                rule.selectors &&
                rule.selectors.length === 1
              ) {
                // check if it can be folded in (e.g. & where)
                if (rule.selectors[0].isJustParentSelector()) {
                  rsRules.splice(i--, 1);

                  for (var j = 0; j < rule.rules.length; j++) {
                    subRule = rule.rules[j];
                    subRule.copyVisibilityInfo(rule.visibilityInfo());
                    if (!(subRule instanceof Rule) || !subRule.variable) {
                      rsRules.splice(++i, 0, subRule);
                    }
                  }
                }
              }
            }

            // Pop the stack
            ctxFrames.shift();
            ctxSelectors.shift();

            if (context.mediaBlocks) {
              for (i = mediaBlockCount; i < context.mediaBlocks.length; i++) {
                context.mediaBlocks[i].bubbleSelectors(selectors);
              }
            }

            return ruleset;
          };
          Ruleset.prototype.evalImports = function(context) {
            var rules = this.rules,
              i,
              importRules;
            if (!rules) {
              return;
            }

            for (i = 0; i < rules.length; i++) {
              if (rules[i].type === "Import") {
                importRules = rules[i].eval(context);
                if (
                  importRules &&
                  (importRules.length || importRules.length === 0)
                ) {
                  rules.splice.apply(rules, [i, 1].concat(importRules));
                  i += importRules.length - 1;
                } else {
                  rules.splice(i, 1, importRules);
                }
                this.resetCache();
              }
            }
          };
          Ruleset.prototype.makeImportant = function() {
            var result = new Ruleset(
              this.selectors,
              this.rules.map(function(r) {
                if (r.makeImportant) {
                  return r.makeImportant();
                } else {
                  return r;
                }
              }),
              this.strictImports,
              this.visibilityInfo()
            );

            return result;
          };
          Ruleset.prototype.matchArgs = function(args) {
            return !args || args.length === 0;
          };
          // lets you call a css selector with a guard
          Ruleset.prototype.matchCondition = function(args, context) {
            var lastSelector = this.selectors[this.selectors.length - 1];
            if (!lastSelector.evaldCondition) {
              return false;
            }
            if (
              lastSelector.condition &&
              !lastSelector.condition.eval(
                new contexts.Eval(context, context.frames)
              )
            ) {
              return false;
            }
            return true;
          };
          Ruleset.prototype.resetCache = function() {
            this._rulesets = null;
            this._variables = null;
            this._lookups = {};
          };
          Ruleset.prototype.variables = function() {
            if (!this._variables) {
              this._variables = !this.rules
                ? {}
                : this.rules.reduce(function(hash, r) {
                    if (r instanceof Rule && r.variable === true) {
                      hash[r.name] = r;
                    }
                    // when evaluating variables in an import statement, imports have not been eval'd
                    // so we need to go inside import statements.
                    // guard against root being a string (in the case of inlined less)
                    if (r.type === "Import" && r.root && r.root.variables) {
                      var vars = r.root.variables();
                      for (var name in vars) {
                        if (vars.hasOwnProperty(name)) {
                          hash[name] = vars[name];
                        }
                      }
                    }
                    return hash;
                  }, {});
            }
            return this._variables;
          };
          Ruleset.prototype.variable = function(name) {
            return this.variables()[name];
          };
          Ruleset.prototype.rulesets = function() {
            if (!this.rules) {
              return [];
            }

            var filtRules = [],
              rules = this.rules,
              cnt = rules.length,
              i,
              rule;

            for (i = 0; i < cnt; i++) {
              rule = rules[i];
              if (rule.isRuleset) {
                filtRules.push(rule);
              }
            }

            return filtRules;
          };
          Ruleset.prototype.prependRule = function(rule) {
            var rules = this.rules;
            if (rules) {
              rules.unshift(rule);
            } else {
              this.rules = [rule];
            }
          };
          Ruleset.prototype.find = function(selector, self, filter) {
            self = self || this;
            var rules = [],
              match,
              foundMixins,
              key = selector.toCSS();

            if (key in this._lookups) {
              return this._lookups[key];
            }

            this.rulesets().forEach(function(rule) {
              if (rule !== self) {
                for (var j = 0; j < rule.selectors.length; j++) {
                  match = selector.match(rule.selectors[j]);
                  if (match) {
                    if (selector.elements.length > match) {
                      if (!filter || filter(rule)) {
                        foundMixins = rule.find(
                          new Selector(selector.elements.slice(match)),
                          self,
                          filter
                        );
                        for (var i = 0; i < foundMixins.length; ++i) {
                          foundMixins[i].path.push(rule);
                        }
                        Array.prototype.push.apply(rules, foundMixins);
                      }
                    } else {
                      rules.push({ rule: rule, path: [] });
                    }
                    break;
                  }
                }
              }
            });
            this._lookups[key] = rules;
            return rules;
          };
          Ruleset.prototype.genCSS = function(context, output) {
            var i,
              j,
              charsetRuleNodes = [],
              ruleNodes = [],
              debugInfo, // Line number debugging
              rule,
              path;

            context.tabLevel = context.tabLevel || 0;

            if (!this.root) {
              context.tabLevel++;
            }

            var tabRuleStr = context.compress
                ? ""
                : Array(context.tabLevel + 1).join("  "),
              tabSetStr = context.compress
                ? ""
                : Array(context.tabLevel).join("  "),
              sep;

            function isRulesetLikeNode(rule) {
              // if it has nested rules, then it should be treated like a ruleset
              // medias and comments do not have nested rules, but should be treated like rulesets anyway
              // some directives and anonymous nodes are ruleset like, others are not
              if (typeof rule.isRulesetLike === "boolean") {
                return rule.isRulesetLike;
              } else if (typeof rule.isRulesetLike === "function") {
                return rule.isRulesetLike();
              }

              //anything else is assumed to be a rule
              return false;
            }

            var charsetNodeIndex = 0;
            var importNodeIndex = 0;
            for (i = 0; i < this.rules.length; i++) {
              rule = this.rules[i];
              if (rule.type === "Comment") {
                if (importNodeIndex === i) {
                  importNodeIndex++;
                }
                ruleNodes.push(rule);
              } else if (rule.isCharset && rule.isCharset()) {
                ruleNodes.splice(charsetNodeIndex, 0, rule);
                charsetNodeIndex++;
                importNodeIndex++;
              } else if (rule.type === "Import") {
                ruleNodes.splice(importNodeIndex, 0, rule);
                importNodeIndex++;
              } else {
                ruleNodes.push(rule);
              }
            }
            ruleNodes = charsetRuleNodes.concat(ruleNodes);

            // If this is the root node, we don't render
            // a selector, or {}.
            if (!this.root) {
              debugInfo = getDebugInfo(context, this, tabSetStr);

              if (debugInfo) {
                output.add(debugInfo);
                output.add(tabSetStr);
              }

              var paths = this.paths,
                pathCnt = paths.length,
                pathSubCnt;

              sep = context.compress ? "," : ",\n" + tabSetStr;

              for (i = 0; i < pathCnt; i++) {
                path = paths[i];
                if (!(pathSubCnt = path.length)) {
                  continue;
                }
                if (i > 0) {
                  output.add(sep);
                }

                context.firstSelector = true;
                path[0].genCSS(context, output);

                context.firstSelector = false;
                for (j = 1; j < pathSubCnt; j++) {
                  path[j].genCSS(context, output);
                }
              }

              output.add((context.compress ? "{" : " {\n") + tabRuleStr);
            }

            // Compile rules and rulesets
            for (i = 0; i < ruleNodes.length; i++) {
              rule = ruleNodes[i];

              if (i + 1 === ruleNodes.length) {
                context.lastRule = true;
              }

              var currentLastRule = context.lastRule;
              if (isRulesetLikeNode(rule)) {
                context.lastRule = false;
              }

              if (rule.genCSS) {
                rule.genCSS(context, output);
              } else if (rule.value) {
                output.add(rule.value.toString());
              }

              context.lastRule = currentLastRule;

              if (!context.lastRule) {
                output.add(context.compress ? "" : "\n" + tabRuleStr);
              } else {
                context.lastRule = false;
              }
            }

            if (!this.root) {
              output.add(context.compress ? "}" : "\n" + tabSetStr + "}");
              context.tabLevel--;
            }

            if (!output.isEmpty() && !context.compress && this.firstRoot) {
              output.add("\n");
            }
          };

          Ruleset.prototype.joinSelectors = function(
            paths,
            context,
            selectors
          ) {
            for (var s = 0; s < selectors.length; s++) {
              this.joinSelector(paths, context, selectors[s]);
            }
          };

          Ruleset.prototype.joinSelector = function(paths, context, selector) {
            function createParenthesis(elementsToPak, originalElement) {
              var replacementParen, j;
              if (elementsToPak.length === 0) {
                replacementParen = new Paren(elementsToPak[0]);
              } else {
                var insideParent = [];
                for (j = 0; j < elementsToPak.length; j++) {
                  insideParent.push(
                    new Element(
                      null,
                      elementsToPak[j],
                      originalElement.index,
                      originalElement.currentFileInfo
                    )
                  );
                }
                replacementParen = new Paren(new Selector(insideParent));
              }
              return replacementParen;
            }

            function createSelector(containedElement, originalElement) {
              var element, selector;
              element = new Element(
                null,
                containedElement,
                originalElement.index,
                originalElement.currentFileInfo
              );
              selector = new Selector([element]);
              return selector;
            }

            // joins selector path from `beginningPath` with selector path in `addPath`
            // `replacedElement` contains element that is being replaced by `addPath`
            // returns concatenated path
            function addReplacementIntoPath(
              beginningPath,
              addPath,
              replacedElement,
              originalSelector
            ) {
              var newSelectorPath, lastSelector, newJoinedSelector;
              // our new selector path
              newSelectorPath = [];

              //construct the joined selector - if & is the first thing this will be empty,
              // if not newJoinedSelector will be the last set of elements in the selector
              if (beginningPath.length > 0) {
                newSelectorPath = beginningPath.slice(0);
                lastSelector = newSelectorPath.pop();
                newJoinedSelector = originalSelector.createDerived(
                  lastSelector.elements.slice(0)
                );
              } else {
                newJoinedSelector = originalSelector.createDerived([]);
              }

              if (addPath.length > 0) {
                // /deep/ is a combinator that is valid without anything in front of it
                // so if the & does not have a combinator that is "" or " " then
                // and there is a combinator on the parent, then grab that.
                // this also allows + a { & .b { .a & { ... though not sure why you would want to do that
                var combinator = replacedElement.combinator,
                  parentEl = addPath[0].elements[0];
                if (
                  combinator.emptyOrWhitespace &&
                  !parentEl.combinator.emptyOrWhitespace
                ) {
                  combinator = parentEl.combinator;
                }
                // join the elements so far with the first part of the parent
                newJoinedSelector.elements.push(
                  new Element(
                    combinator,
                    parentEl.value,
                    replacedElement.index,
                    replacedElement.currentFileInfo
                  )
                );
                newJoinedSelector.elements = newJoinedSelector.elements.concat(
                  addPath[0].elements.slice(1)
                );
              }

              // now add the joined selector - but only if it is not empty
              if (newJoinedSelector.elements.length !== 0) {
                newSelectorPath.push(newJoinedSelector);
              }

              //put together the parent selectors after the join (e.g. the rest of the parent)
              if (addPath.length > 1) {
                var restOfPath = addPath.slice(1);
                restOfPath = restOfPath.map(function(selector) {
                  return selector.createDerived(selector.elements, []);
                });
                newSelectorPath = newSelectorPath.concat(restOfPath);
              }
              return newSelectorPath;
            }

            // joins selector path from `beginningPath` with every selector path in `addPaths` array
            // `replacedElement` contains element that is being replaced by `addPath`
            // returns array with all concatenated paths
            function addAllReplacementsIntoPath(
              beginningPath,
              addPaths,
              replacedElement,
              originalSelector,
              result
            ) {
              var j;
              for (j = 0; j < beginningPath.length; j++) {
                var newSelectorPath = addReplacementIntoPath(
                  beginningPath[j],
                  addPaths,
                  replacedElement,
                  originalSelector
                );
                result.push(newSelectorPath);
              }
              return result;
            }

            function mergeElementsOnToSelectors(elements, selectors) {
              var i, sel;

              if (elements.length === 0) {
                return;
              }
              if (selectors.length === 0) {
                selectors.push([new Selector(elements)]);
                return;
              }

              for (i = 0; i < selectors.length; i++) {
                sel = selectors[i];

                // if the previous thing in sel is a parent this needs to join on to it
                if (sel.length > 0) {
                  sel[sel.length - 1] = sel[sel.length - 1].createDerived(
                    sel[sel.length - 1].elements.concat(elements)
                  );
                } else {
                  sel.push(new Selector(elements));
                }
              }
            }

            // replace all parent selectors inside `inSelector` by content of `context` array
            // resulting selectors are returned inside `paths` array
            // returns true if `inSelector` contained at least one parent selector
            function replaceParentSelector(paths, context, inSelector) {
              // The paths are [[Selector]]
              // The first list is a list of comma separated selectors
              // The inner list is a list of inheritance separated selectors
              // e.g.
              // .a, .b {
              //   .c {
              //   }
              // }
              // == [[.a] [.c]] [[.b] [.c]]
              //
              var i,
                j,
                k,
                currentElements,
                newSelectors,
                selectorsMultiplied,
                sel,
                el,
                hadParentSelector = false,
                length,
                lastSelector;

              function findNestedSelector(element) {
                var maybeSelector;
                if (element.value.type !== "Paren") {
                  return null;
                }

                maybeSelector = element.value.value;
                if (maybeSelector.type !== "Selector") {
                  return null;
                }

                return maybeSelector;
              }

              // the elements from the current selector so far
              currentElements = [];
              // the current list of new selectors to add to the path.
              // We will build it up. We initiate it with one empty selector as we "multiply" the new selectors
              // by the parents
              newSelectors = [[]];

              for (i = 0; i < inSelector.elements.length; i++) {
                el = inSelector.elements[i];
                // non parent reference elements just get added
                if (el.value !== "&") {
                  var nestedSelector = findNestedSelector(el);
                  if (nestedSelector != null) {
                    // merge the current list of non parent selector elements
                    // on to the current list of selectors to add
                    mergeElementsOnToSelectors(currentElements, newSelectors);

                    var nestedPaths = [],
                      replaced,
                      replacedNewSelectors = [];
                    replaced = replaceParentSelector(
                      nestedPaths,
                      context,
                      nestedSelector
                    );
                    hadParentSelector = hadParentSelector || replaced;
                    //the nestedPaths array should have only one member - replaceParentSelector does not multiply selectors
                    for (k = 0; k < nestedPaths.length; k++) {
                      var replacementSelector = createSelector(
                        createParenthesis(nestedPaths[k], el),
                        el
                      );
                      addAllReplacementsIntoPath(
                        newSelectors,
                        [replacementSelector],
                        el,
                        inSelector,
                        replacedNewSelectors
                      );
                    }
                    newSelectors = replacedNewSelectors;
                    currentElements = [];
                  } else {
                    currentElements.push(el);
                  }
                } else {
                  hadParentSelector = true;
                  // the new list of selectors to add
                  selectorsMultiplied = [];

                  // merge the current list of non parent selector elements
                  // on to the current list of selectors to add
                  mergeElementsOnToSelectors(currentElements, newSelectors);

                  // loop through our current selectors
                  for (j = 0; j < newSelectors.length; j++) {
                    sel = newSelectors[j];
                    // if we don't have any parent paths, the & might be in a mixin so that it can be used
                    // whether there are parents or not
                    if (context.length === 0) {
                      // the combinator used on el should now be applied to the next element instead so that
                      // it is not lost
                      if (sel.length > 0) {
                        sel[0].elements.push(
                          new Element(
                            el.combinator,
                            "",
                            el.index,
                            el.currentFileInfo
                          )
                        );
                      }
                      selectorsMultiplied.push(sel);
                    } else {
                      // and the parent selectors
                      for (k = 0; k < context.length; k++) {
                        // We need to put the current selectors
                        // then join the last selector's elements on to the parents selectors
                        var newSelectorPath = addReplacementIntoPath(
                          sel,
                          context[k],
                          el,
                          inSelector
                        );
                        // add that to our new set of selectors
                        selectorsMultiplied.push(newSelectorPath);
                      }
                    }
                  }

                  // our new selectors has been multiplied, so reset the state
                  newSelectors = selectorsMultiplied;
                  currentElements = [];
                }
              }

              // if we have any elements left over (e.g. .a& .b == .b)
              // add them on to all the current selectors
              mergeElementsOnToSelectors(currentElements, newSelectors);

              for (i = 0; i < newSelectors.length; i++) {
                length = newSelectors[i].length;
                if (length > 0) {
                  paths.push(newSelectors[i]);
                  lastSelector = newSelectors[i][length - 1];
                  newSelectors[i][length - 1] = lastSelector.createDerived(
                    lastSelector.elements,
                    inSelector.extendList
                  );
                  //newSelectors[i][length - 1].copyVisibilityInfo(inSelector.visibilityInfo());
                }
              }

              return hadParentSelector;
            }

            function deriveSelector(visibilityInfo, deriveFrom) {
              var newSelector = deriveFrom.createDerived(
                deriveFrom.elements,
                deriveFrom.extendList,
                deriveFrom.evaldCondition
              );
              newSelector.copyVisibilityInfo(visibilityInfo);
              return newSelector;
            }

            // joinSelector code follows
            var i, newPaths, hadParentSelector;

            newPaths = [];
            hadParentSelector = replaceParentSelector(
              newPaths,
              context,
              selector
            );

            if (!hadParentSelector) {
              if (context.length > 0) {
                newPaths = [];
                for (i = 0; i < context.length; i++) {
                  //var concatenated = [];
                  //context[i].forEach(function(entry) {
                  //    var newEntry = entry.createDerived(entry.elements, entry.extendList, entry.evaldCondition);
                  //    newEntry.copyVisibilityInfo(selector.visibilityInfo());
                  //    concatenated.push(newEntry);
                  //}, this);
                  var concatenated = context[i].map(
                    deriveSelector.bind(this, selector.visibilityInfo())
                  );

                  concatenated.push(selector);
                  newPaths.push(concatenated);
                }
              } else {
                newPaths = [[selector]];
              }
            }

            for (i = 0; i < newPaths.length; i++) {
              paths.push(newPaths[i]);
            }
          };
          module.exports = Ruleset;
        },
        {
          "../contexts": 11,
          "../functions/default": 20,
          "../functions/function-registry": 22,
          "./debug-info": 54,
          "./element": 58,
          "./node": 70,
          "./paren": 72,
          "./rule": 74,
          "./selector": 77
        }
      ],
      77: [
        function(require, module, exports) {
          var Node = require("./node"),
            Element = require("./element");

          var Selector = function(
            elements,
            extendList,
            condition,
            index,
            currentFileInfo,
            visibilityInfo
          ) {
            this.elements = elements;
            this.extendList = extendList;
            this.condition = condition;
            this.currentFileInfo = currentFileInfo || {};
            if (!condition) {
              this.evaldCondition = true;
            }
            this.copyVisibilityInfo(visibilityInfo);
          };
          Selector.prototype = new Node();
          Selector.prototype.type = "Selector";
          Selector.prototype.accept = function(visitor) {
            if (this.elements) {
              this.elements = visitor.visitArray(this.elements);
            }
            if (this.extendList) {
              this.extendList = visitor.visitArray(this.extendList);
            }
            if (this.condition) {
              this.condition = visitor.visit(this.condition);
            }
          };
          Selector.prototype.createDerived = function(
            elements,
            extendList,
            evaldCondition
          ) {
            var info = this.visibilityInfo();
            evaldCondition =
              evaldCondition != null ? evaldCondition : this.evaldCondition;
            var newSelector = new Selector(
              elements,
              extendList || this.extendList,
              null,
              this.index,
              this.currentFileInfo,
              info
            );
            newSelector.evaldCondition = evaldCondition;
            newSelector.mediaEmpty = this.mediaEmpty;
            return newSelector;
          };
          Selector.prototype.createEmptySelectors = function() {
            var el = new Element("", "&", this.index, this.currentFileInfo),
              sels = [
                new Selector([el], null, null, this.index, this.currentFileInfo)
              ];
            sels[0].mediaEmpty = true;
            return sels;
          };
          Selector.prototype.match = function(other) {
            var elements = this.elements,
              len = elements.length,
              olen,
              i;

            other.CacheElements();

            olen = other._elements.length;
            if (olen === 0 || len < olen) {
              return 0;
            } else {
              for (i = 0; i < olen; i++) {
                if (elements[i].value !== other._elements[i]) {
                  return 0;
                }
              }
            }

            return olen; // return number of matched elements
          };
          Selector.prototype.CacheElements = function() {
            if (this._elements) {
              return;
            }

            var elements = this.elements
              .map(function(v) {
                return v.combinator.value + (v.value.value || v.value);
              })
              .join("")
              .match(/[,&#\*\.\w-]([\w-]|(\\.))*/g);

            if (elements) {
              if (elements[0] === "&") {
                elements.shift();
              }
            } else {
              elements = [];
            }

            this._elements = elements;
          };
          Selector.prototype.isJustParentSelector = function() {
            return (
              !this.mediaEmpty &&
              this.elements.length === 1 &&
              this.elements[0].value === "&" &&
              (this.elements[0].combinator.value === " " ||
                this.elements[0].combinator.value === "")
            );
          };
          Selector.prototype.eval = function(context) {
            var evaldCondition = this.condition && this.condition.eval(context),
              elements = this.elements,
              extendList = this.extendList;

            elements =
              elements &&
              elements.map(function(e) {
                return e.eval(context);
              });
            extendList =
              extendList &&
              extendList.map(function(extend) {
                return extend.eval(context);
              });

            return this.createDerived(elements, extendList, evaldCondition);
          };
          Selector.prototype.genCSS = function(context, output) {
            var i, element;
            if (
              (!context || !context.firstSelector) &&
              this.elements[0].combinator.value === ""
            ) {
              output.add(" ", this.currentFileInfo, this.index);
            }
            if (!this._css) {
              //TODO caching? speed comparison?
              for (i = 0; i < this.elements.length; i++) {
                element = this.elements[i];
                element.genCSS(context, output);
              }
            }
          };
          Selector.prototype.getIsOutput = function() {
            return this.evaldCondition;
          };
          module.exports = Selector;
        },
        { "./element": 58, "./node": 70 }
      ],
      78: [
        function(require, module, exports) {
          var Node = require("./node");

          var UnicodeDescriptor = function(value) {
            this.value = value;
          };
          UnicodeDescriptor.prototype = new Node();
          UnicodeDescriptor.prototype.type = "UnicodeDescriptor";

          module.exports = UnicodeDescriptor;
        },
        { "./node": 70 }
      ],
      79: [
        function(require, module, exports) {
          var Node = require("./node"),
            unitConversions = require("../data/unit-conversions");

          var Unit = function(numerator, denominator, backupUnit) {
            this.numerator = numerator ? numerator.slice(0).sort() : [];
            this.denominator = denominator ? denominator.slice(0).sort() : [];
            if (backupUnit) {
              this.backupUnit = backupUnit;
            } else if (numerator && numerator.length) {
              this.backupUnit = numerator[0];
            }
          };

          Unit.prototype = new Node();
          Unit.prototype.type = "Unit";
          Unit.prototype.clone = function() {
            return new Unit(
              this.numerator.slice(0),
              this.denominator.slice(0),
              this.backupUnit
            );
          };
          Unit.prototype.genCSS = function(context, output) {
            // Dimension checks the unit is singular and throws an error if in strict math mode.
            var strictUnits = context && context.strictUnits;
            if (this.numerator.length === 1) {
              output.add(this.numerator[0]); // the ideal situation
            } else if (!strictUnits && this.backupUnit) {
              output.add(this.backupUnit);
            } else if (!strictUnits && this.denominator.length) {
              output.add(this.denominator[0]);
            }
          };
          Unit.prototype.toString = function() {
            var i,
              returnStr = this.numerator.join("*");
            for (i = 0; i < this.denominator.length; i++) {
              returnStr += "/" + this.denominator[i];
            }
            return returnStr;
          };
          Unit.prototype.compare = function(other) {
            return this.is(other.toString()) ? 0 : undefined;
          };
          Unit.prototype.is = function(unitString) {
            return this.toString().toUpperCase() === unitString.toUpperCase();
          };
          Unit.prototype.isLength = function() {
            return Boolean(this.toCSS().match(/px|em|%|in|cm|mm|pc|pt|ex/));
          };
          Unit.prototype.isEmpty = function() {
            return this.numerator.length === 0 && this.denominator.length === 0;
          };
          Unit.prototype.isSingular = function() {
            return this.numerator.length <= 1 && this.denominator.length === 0;
          };
          Unit.prototype.map = function(callback) {
            var i;

            for (i = 0; i < this.numerator.length; i++) {
              this.numerator[i] = callback(this.numerator[i], false);
            }

            for (i = 0; i < this.denominator.length; i++) {
              this.denominator[i] = callback(this.denominator[i], true);
            }
          };
          Unit.prototype.usedUnits = function() {
            var group,
              result = {},
              mapUnit,
              groupName;

            mapUnit = function(atomicUnit) {
              /*jshint loopfunc:true */
              if (group.hasOwnProperty(atomicUnit) && !result[groupName]) {
                result[groupName] = atomicUnit;
              }

              return atomicUnit;
            };

            for (groupName in unitConversions) {
              if (unitConversions.hasOwnProperty(groupName)) {
                group = unitConversions[groupName];

                this.map(mapUnit);
              }
            }

            return result;
          };
          Unit.prototype.cancel = function() {
            var counter = {},
              atomicUnit,
              i;

            for (i = 0; i < this.numerator.length; i++) {
              atomicUnit = this.numerator[i];
              counter[atomicUnit] = (counter[atomicUnit] || 0) + 1;
            }

            for (i = 0; i < this.denominator.length; i++) {
              atomicUnit = this.denominator[i];
              counter[atomicUnit] = (counter[atomicUnit] || 0) - 1;
            }

            this.numerator = [];
            this.denominator = [];

            for (atomicUnit in counter) {
              if (counter.hasOwnProperty(atomicUnit)) {
                var count = counter[atomicUnit];

                if (count > 0) {
                  for (i = 0; i < count; i++) {
                    this.numerator.push(atomicUnit);
                  }
                } else if (count < 0) {
                  for (i = 0; i < -count; i++) {
                    this.denominator.push(atomicUnit);
                  }
                }
              }
            }

            this.numerator.sort();
            this.denominator.sort();
          };
          module.exports = Unit;
        },
        { "../data/unit-conversions": 14, "./node": 70 }
      ],
      80: [
        function(require, module, exports) {
          var Node = require("./node");

          var URL = function(val, index, currentFileInfo, isEvald) {
            this.value = val;
            this.currentFileInfo = currentFileInfo;
            this.index = index;
            this.isEvald = isEvald;
          };
          URL.prototype = new Node();
          URL.prototype.type = "Url";
          URL.prototype.accept = function(visitor) {
            this.value = visitor.visit(this.value);
          };
          URL.prototype.genCSS = function(context, output) {
            output.add("url(");
            this.value.genCSS(context, output);
            output.add(")");
          };
          URL.prototype.eval = function(context) {
            var val = this.value.eval(context),
              rootpath;

            if (!this.isEvald) {
              // Add the base path if the URL is relative
              rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
              if (
                rootpath &&
                typeof val.value === "string" &&
                context.isPathRelative(val.value)
              ) {
                if (!val.quote) {
                  rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) {
                    return "\\" + match;
                  });
                }
                val.value = rootpath + val.value;
              }

              val.value = context.normalizePath(val.value);

              // Add url args if enabled
              if (context.urlArgs) {
                if (!val.value.match(/^\s*data:/)) {
                  var delimiter = val.value.indexOf("?") === -1 ? "?" : "&";
                  var urlArgs = delimiter + context.urlArgs;
                  if (val.value.indexOf("#") !== -1) {
                    val.value = val.value.replace("#", urlArgs + "#");
                  } else {
                    val.value += urlArgs;
                  }
                }
              }
            }

            return new URL(val, this.index, this.currentFileInfo, true);
          };
          module.exports = URL;
        },
        { "./node": 70 }
      ],
      81: [
        function(require, module, exports) {
          var Node = require("./node");

          var Value = function(value) {
            this.value = value;
            if (!value) {
              throw new Error("Value requires an array argument");
            }
          };
          Value.prototype = new Node();
          Value.prototype.type = "Value";
          Value.prototype.accept = function(visitor) {
            if (this.value) {
              this.value = visitor.visitArray(this.value);
            }
          };
          Value.prototype.eval = function(context) {
            if (this.value.length === 1) {
              return this.value[0].eval(context);
            } else {
              return new Value(
                this.value.map(function(v) {
                  return v.eval(context);
                })
              );
            }
          };
          Value.prototype.genCSS = function(context, output) {
            var i;
            for (i = 0; i < this.value.length; i++) {
              this.value[i].genCSS(context, output);
              if (i + 1 < this.value.length) {
                output.add(context && context.compress ? "," : ", ");
              }
            }
          };
          module.exports = Value;
        },
        { "./node": 70 }
      ],
      82: [
        function(require, module, exports) {
          var Node = require("./node");

          var Variable = function(name, index, currentFileInfo) {
            this.name = name;
            this.index = index;
            this.currentFileInfo = currentFileInfo || {};
          };
          Variable.prototype = new Node();
          Variable.prototype.type = "Variable";
          Variable.prototype.eval = function(context) {
            var variable,
              name = this.name;

            if (name.indexOf("@@") === 0) {
              name =
                "@" +
                new Variable(
                  name.slice(1),
                  this.index,
                  this.currentFileInfo
                ).eval(context).value;
            }

            if (this.evaluating) {
              throw {
                type: "Name",
                message: "Recursive variable definition for " + name,
                filename: this.currentFileInfo.filename,
                index: this.index
              };
            }

            this.evaluating = true;

            variable = this.find(context.frames, function(frame) {
              var v = frame.variable(name);
              if (v) {
                if (v.important) {
                  var importantScope =
                    context.importantScope[context.importantScope.length - 1];
                  importantScope.important = v.important;
                }
                return v.value.eval(context);
              }
            });
            if (variable) {
              this.evaluating = false;
              return variable;
            } else {
              throw {
                type: "Name",
                message: "variable " + name + " is undefined",
                filename: this.currentFileInfo.filename,
                index: this.index
              };
            }
          };
          Variable.prototype.find = function(obj, fun) {
            for (var i = 0, r; i < obj.length; i++) {
              r = fun.call(obj, obj[i]);
              if (r) {
                return r;
              }
            }
            return null;
          };
          module.exports = Variable;
        },
        { "./node": 70 }
      ],
      83: [
        function(require, module, exports) {
          module.exports = {
            getLocation: function(index, inputStream) {
              var n = index + 1,
                line = null,
                column = -1;

              while (--n >= 0 && inputStream.charAt(n) !== "\n") {
                column++;
              }

              if (typeof index === "number") {
                line = (inputStream.slice(0, index).match(/\n/g) || "").length;
              }

              return {
                line: line,
                column: column
              };
            }
          };
        },
        {}
      ],
      84: [
        function(require, module, exports) {
          var tree = require("../tree"),
            Visitor = require("./visitor"),
            logger = require("../logger");

          /*jshint loopfunc:true */

          var ExtendFinderVisitor = function() {
            this._visitor = new Visitor(this);
            this.contexts = [];
            this.allExtendsStack = [[]];
          };

          ExtendFinderVisitor.prototype = {
            run: function(root) {
              root = this._visitor.visit(root);
              root.allExtends = this.allExtendsStack[0];
              return root;
            },
            visitRule: function(ruleNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitMixinDefinition: function(mixinDefinitionNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitRuleset: function(rulesetNode, visitArgs) {
              if (rulesetNode.root) {
                return;
              }

              var i,
                j,
                extend,
                allSelectorsExtendList = [],
                extendList;

              // get &:extend(.a); rules which apply to all selectors in this ruleset
              var rules = rulesetNode.rules,
                ruleCnt = rules ? rules.length : 0;
              for (i = 0; i < ruleCnt; i++) {
                if (rulesetNode.rules[i] instanceof tree.Extend) {
                  allSelectorsExtendList.push(rules[i]);
                  rulesetNode.extendOnEveryPath = true;
                }
              }

              // now find every selector and apply the extends that apply to all extends
              // and the ones which apply to an individual extend
              var paths = rulesetNode.paths;
              for (i = 0; i < paths.length; i++) {
                var selectorPath = paths[i],
                  selector = selectorPath[selectorPath.length - 1],
                  selExtendList = selector.extendList;

                extendList = selExtendList
                  ? selExtendList.slice(0).concat(allSelectorsExtendList)
                  : allSelectorsExtendList;

                if (extendList) {
                  extendList = extendList.map(function(allSelectorsExtend) {
                    return allSelectorsExtend.clone();
                  });
                }

                for (j = 0; j < extendList.length; j++) {
                  this.foundExtends = true;
                  extend = extendList[j];
                  extend.findSelfSelectors(selectorPath);
                  extend.ruleset = rulesetNode;
                  if (j === 0) {
                    extend.firstExtendOnThisSelectorPath = true;
                  }
                  this.allExtendsStack[this.allExtendsStack.length - 1].push(
                    extend
                  );
                }
              }

              this.contexts.push(rulesetNode.selectors);
            },
            visitRulesetOut: function(rulesetNode) {
              if (!rulesetNode.root) {
                this.contexts.length = this.contexts.length - 1;
              }
            },
            visitMedia: function(mediaNode, visitArgs) {
              mediaNode.allExtends = [];
              this.allExtendsStack.push(mediaNode.allExtends);
            },
            visitMediaOut: function(mediaNode) {
              this.allExtendsStack.length = this.allExtendsStack.length - 1;
            },
            visitDirective: function(directiveNode, visitArgs) {
              directiveNode.allExtends = [];
              this.allExtendsStack.push(directiveNode.allExtends);
            },
            visitDirectiveOut: function(directiveNode) {
              this.allExtendsStack.length = this.allExtendsStack.length - 1;
            }
          };

          var ProcessExtendsVisitor = function() {
            this._visitor = new Visitor(this);
          };

          ProcessExtendsVisitor.prototype = {
            run: function(root) {
              var extendFinder = new ExtendFinderVisitor();
              this.extendIndices = {};
              extendFinder.run(root);
              if (!extendFinder.foundExtends) {
                return root;
              }
              root.allExtends = root.allExtends.concat(
                this.doExtendChaining(root.allExtends, root.allExtends)
              );
              this.allExtendsStack = [root.allExtends];
              var newRoot = this._visitor.visit(root);
              this.checkExtendsForNonMatched(root.allExtends);
              return newRoot;
            },
            checkExtendsForNonMatched: function(extendList) {
              var indices = this.extendIndices;
              extendList
                .filter(function(extend) {
                  return (
                    !extend.hasFoundMatches && extend.parent_ids.length == 1
                  );
                })
                .forEach(function(extend) {
                  var selector = "_unknown_";
                  try {
                    selector = extend.selector.toCSS({});
                  } catch (_) {}

                  if (!indices[extend.index + " " + selector]) {
                    indices[extend.index + " " + selector] = true;
                    logger.warn("extend '" + selector + "' has no matches");
                  }
                });
            },
            doExtendChaining: function(
              extendsList,
              extendsListTarget,
              iterationCount
            ) {
              //
              // chaining is different from normal extension.. if we extend an extend then we are not just copying, altering
              // and pasting the selector we would do normally, but we are also adding an extend with the same target selector
              // this means this new extend can then go and alter other extends
              //
              // this method deals with all the chaining work - without it, extend is flat and doesn't work on other extend selectors
              // this is also the most expensive.. and a match on one selector can cause an extension of a selector we had already
              // processed if we look at each selector at a time, as is done in visitRuleset

              var extendIndex,
                targetExtendIndex,
                matches,
                extendsToAdd = [],
                newSelector,
                extendVisitor = this,
                selectorPath,
                extend,
                targetExtend,
                newExtend;

              iterationCount = iterationCount || 0;

              //loop through comparing every extend with every target extend.
              // a target extend is the one on the ruleset we are looking at copy/edit/pasting in place
              // e.g.  .a:extend(.b) {}  and .b:extend(.c) {} then the first extend extends the second one
              // and the second is the target.
              // the separation into two lists allows us to process a subset of chains with a bigger set, as is the
              // case when processing media queries
              for (
                extendIndex = 0;
                extendIndex < extendsList.length;
                extendIndex++
              ) {
                for (
                  targetExtendIndex = 0;
                  targetExtendIndex < extendsListTarget.length;
                  targetExtendIndex++
                ) {
                  extend = extendsList[extendIndex];
                  targetExtend = extendsListTarget[targetExtendIndex];

                  // look for circular references
                  if (extend.parent_ids.indexOf(targetExtend.object_id) >= 0) {
                    continue;
                  }

                  // find a match in the target extends self selector (the bit before :extend)
                  selectorPath = [targetExtend.selfSelectors[0]];
                  matches = extendVisitor.findMatch(extend, selectorPath);

                  if (matches.length) {
                    extend.hasFoundMatches = true;

                    // we found a match, so for each self selector..
                    extend.selfSelectors.forEach(function(selfSelector) {
                      var info = targetExtend.visibilityInfo();

                      // process the extend as usual
                      newSelector = extendVisitor.extendSelector(
                        matches,
                        selectorPath,
                        selfSelector,
                        extend.isVisible()
                      );

                      // but now we create a new extend from it
                      newExtend = new tree.Extend(
                        targetExtend.selector,
                        targetExtend.option,
                        0,
                        targetExtend.currentFileInfo,
                        info
                      );
                      newExtend.selfSelectors = newSelector;

                      // add the extend onto the list of extends for that selector
                      newSelector[newSelector.length - 1].extendList = [
                        newExtend
                      ];

                      // record that we need to add it.
                      extendsToAdd.push(newExtend);
                      newExtend.ruleset = targetExtend.ruleset;

                      //remember its parents for circular references
                      newExtend.parent_ids = newExtend.parent_ids.concat(
                        targetExtend.parent_ids,
                        extend.parent_ids
                      );

                      // only process the selector once.. if we have :extend(.a,.b) then multiple
                      // extends will look at the same selector path, so when extending
                      // we know that any others will be duplicates in terms of what is added to the css
                      if (targetExtend.firstExtendOnThisSelectorPath) {
                        newExtend.firstExtendOnThisSelectorPath = true;
                        targetExtend.ruleset.paths.push(newSelector);
                      }
                    });
                  }
                }
              }

              if (extendsToAdd.length) {
                // try to detect circular references to stop a stack overflow.
                // may no longer be needed.
                this.extendChainCount++;
                if (iterationCount > 100) {
                  var selectorOne = "{unable to calculate}";
                  var selectorTwo = "{unable to calculate}";
                  try {
                    selectorOne = extendsToAdd[0].selfSelectors[0].toCSS();
                    selectorTwo = extendsToAdd[0].selector.toCSS();
                  } catch (e) {}
                  throw {
                    message:
                      "extend circular reference detected. One of the circular extends is currently:" +
                      selectorOne +
                      ":extend(" +
                      selectorTwo +
                      ")"
                  };
                }

                // now process the new extends on the existing rules so that we can handle a extending b extending c extending
                // d extending e...
                return extendsToAdd.concat(
                  extendVisitor.doExtendChaining(
                    extendsToAdd,
                    extendsListTarget,
                    iterationCount + 1
                  )
                );
              } else {
                return extendsToAdd;
              }
            },
            visitRule: function(ruleNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitMixinDefinition: function(mixinDefinitionNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitSelector: function(selectorNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitRuleset: function(rulesetNode, visitArgs) {
              if (rulesetNode.root) {
                return;
              }
              var matches,
                pathIndex,
                extendIndex,
                allExtends = this.allExtendsStack[
                  this.allExtendsStack.length - 1
                ],
                selectorsToAdd = [],
                extendVisitor = this,
                selectorPath;

              // look at each selector path in the ruleset, find any extend matches and then copy, find and replace

              for (
                extendIndex = 0;
                extendIndex < allExtends.length;
                extendIndex++
              ) {
                for (
                  pathIndex = 0;
                  pathIndex < rulesetNode.paths.length;
                  pathIndex++
                ) {
                  selectorPath = rulesetNode.paths[pathIndex];

                  // extending extends happens initially, before the main pass
                  if (rulesetNode.extendOnEveryPath) {
                    continue;
                  }
                  var extendList =
                    selectorPath[selectorPath.length - 1].extendList;
                  if (extendList && extendList.length) {
                    continue;
                  }

                  matches = this.findMatch(
                    allExtends[extendIndex],
                    selectorPath
                  );

                  if (matches.length) {
                    allExtends[extendIndex].hasFoundMatches = true;

                    allExtends[extendIndex].selfSelectors.forEach(function(
                      selfSelector
                    ) {
                      var extendedSelectors;
                      extendedSelectors = extendVisitor.extendSelector(
                        matches,
                        selectorPath,
                        selfSelector,
                        allExtends[extendIndex].isVisible()
                      );
                      selectorsToAdd.push(extendedSelectors);
                    });
                  }
                }
              }
              rulesetNode.paths = rulesetNode.paths.concat(selectorsToAdd);
            },
            findMatch: function(extend, haystackSelectorPath) {
              //
              // look through the haystack selector path to try and find the needle - extend.selector
              // returns an array of selector matches that can then be replaced
              //
              var haystackSelectorIndex,
                hackstackSelector,
                hackstackElementIndex,
                haystackElement,
                targetCombinator,
                i,
                extendVisitor = this,
                needleElements = extend.selector.elements,
                potentialMatches = [],
                potentialMatch,
                matches = [];

              // loop through the haystack elements
              for (
                haystackSelectorIndex = 0;
                haystackSelectorIndex < haystackSelectorPath.length;
                haystackSelectorIndex++
              ) {
                hackstackSelector = haystackSelectorPath[haystackSelectorIndex];

                for (
                  hackstackElementIndex = 0;
                  hackstackElementIndex < hackstackSelector.elements.length;
                  hackstackElementIndex++
                ) {
                  haystackElement =
                    hackstackSelector.elements[hackstackElementIndex];

                  // if we allow elements before our match we can add a potential match every time. otherwise only at the first element.
                  if (
                    extend.allowBefore ||
                    (haystackSelectorIndex === 0 && hackstackElementIndex === 0)
                  ) {
                    potentialMatches.push({
                      pathIndex: haystackSelectorIndex,
                      index: hackstackElementIndex,
                      matched: 0,
                      initialCombinator: haystackElement.combinator
                    });
                  }

                  for (i = 0; i < potentialMatches.length; i++) {
                    potentialMatch = potentialMatches[i];

                    // selectors add " " onto the first element. When we use & it joins the selectors together, but if we don't
                    // then each selector in haystackSelectorPath has a space before it added in the toCSS phase. so we need to
                    // work out what the resulting combinator will be
                    targetCombinator = haystackElement.combinator.value;
                    if (
                      targetCombinator === "" &&
                      hackstackElementIndex === 0
                    ) {
                      targetCombinator = " ";
                    }

                    // if we don't match, null our match to indicate failure
                    if (
                      !extendVisitor.isElementValuesEqual(
                        needleElements[potentialMatch.matched].value,
                        haystackElement.value
                      ) ||
                      (potentialMatch.matched > 0 &&
                        needleElements[potentialMatch.matched].combinator
                          .value !== targetCombinator)
                    ) {
                      potentialMatch = null;
                    } else {
                      potentialMatch.matched++;
                    }

                    // if we are still valid and have finished, test whether we have elements after and whether these are allowed
                    if (potentialMatch) {
                      potentialMatch.finished =
                        potentialMatch.matched === needleElements.length;
                      if (
                        potentialMatch.finished &&
                        (!extend.allowAfter &&
                          (hackstackElementIndex + 1 <
                            hackstackSelector.elements.length ||
                            haystackSelectorIndex + 1 <
                              haystackSelectorPath.length))
                      ) {
                        potentialMatch = null;
                      }
                    }
                    // if null we remove, if not, we are still valid, so either push as a valid match or continue
                    if (potentialMatch) {
                      if (potentialMatch.finished) {
                        potentialMatch.length = needleElements.length;
                        potentialMatch.endPathIndex = haystackSelectorIndex;
                        potentialMatch.endPathElementIndex =
                          hackstackElementIndex + 1; // index after end of match
                        potentialMatches.length = 0; // we don't allow matches to overlap, so start matching again
                        matches.push(potentialMatch);
                      }
                    } else {
                      potentialMatches.splice(i, 1);
                      i--;
                    }
                  }
                }
              }
              return matches;
            },
            isElementValuesEqual: function(elementValue1, elementValue2) {
              if (
                typeof elementValue1 === "string" ||
                typeof elementValue2 === "string"
              ) {
                return elementValue1 === elementValue2;
              }
              if (elementValue1 instanceof tree.Attribute) {
                if (
                  elementValue1.op !== elementValue2.op ||
                  elementValue1.key !== elementValue2.key
                ) {
                  return false;
                }
                if (!elementValue1.value || !elementValue2.value) {
                  if (elementValue1.value || elementValue2.value) {
                    return false;
                  }
                  return true;
                }
                elementValue1 =
                  elementValue1.value.value || elementValue1.value;
                elementValue2 =
                  elementValue2.value.value || elementValue2.value;
                return elementValue1 === elementValue2;
              }
              elementValue1 = elementValue1.value;
              elementValue2 = elementValue2.value;
              if (elementValue1 instanceof tree.Selector) {
                if (
                  !(elementValue2 instanceof tree.Selector) ||
                  elementValue1.elements.length !==
                    elementValue2.elements.length
                ) {
                  return false;
                }
                for (var i = 0; i < elementValue1.elements.length; i++) {
                  if (
                    elementValue1.elements[i].combinator.value !==
                    elementValue2.elements[i].combinator.value
                  ) {
                    if (
                      i !== 0 ||
                      (elementValue1.elements[i].combinator.value || " ") !==
                        (elementValue2.elements[i].combinator.value || " ")
                    ) {
                      return false;
                    }
                  }
                  if (
                    !this.isElementValuesEqual(
                      elementValue1.elements[i].value,
                      elementValue2.elements[i].value
                    )
                  ) {
                    return false;
                  }
                }
                return true;
              }
              return false;
            },
            extendSelector: function(
              matches,
              selectorPath,
              replacementSelector,
              isVisible
            ) {
              //for a set of matches, replace each match with the replacement selector

              var currentSelectorPathIndex = 0,
                currentSelectorPathElementIndex = 0,
                path = [],
                matchIndex,
                selector,
                firstElement,
                match,
                newElements;

              for (matchIndex = 0; matchIndex < matches.length; matchIndex++) {
                match = matches[matchIndex];
                selector = selectorPath[match.pathIndex];
                firstElement = new tree.Element(
                  match.initialCombinator,
                  replacementSelector.elements[0].value,
                  replacementSelector.elements[0].index,
                  replacementSelector.elements[0].currentFileInfo
                );

                if (
                  match.pathIndex > currentSelectorPathIndex &&
                  currentSelectorPathElementIndex > 0
                ) {
                  path[path.length - 1].elements = path[
                    path.length - 1
                  ].elements.concat(
                    selectorPath[currentSelectorPathIndex].elements.slice(
                      currentSelectorPathElementIndex
                    )
                  );
                  currentSelectorPathElementIndex = 0;
                  currentSelectorPathIndex++;
                }

                newElements = selector.elements
                  .slice(currentSelectorPathElementIndex, match.index)
                  .concat([firstElement])
                  .concat(replacementSelector.elements.slice(1));

                if (
                  currentSelectorPathIndex === match.pathIndex &&
                  matchIndex > 0
                ) {
                  path[path.length - 1].elements = path[
                    path.length - 1
                  ].elements.concat(newElements);
                } else {
                  path = path.concat(
                    selectorPath.slice(
                      currentSelectorPathIndex,
                      match.pathIndex
                    )
                  );

                  path.push(new tree.Selector(newElements));
                }
                currentSelectorPathIndex = match.endPathIndex;
                currentSelectorPathElementIndex = match.endPathElementIndex;
                if (
                  currentSelectorPathElementIndex >=
                  selectorPath[currentSelectorPathIndex].elements.length
                ) {
                  currentSelectorPathElementIndex = 0;
                  currentSelectorPathIndex++;
                }
              }

              if (
                currentSelectorPathIndex < selectorPath.length &&
                currentSelectorPathElementIndex > 0
              ) {
                path[path.length - 1].elements = path[
                  path.length - 1
                ].elements.concat(
                  selectorPath[currentSelectorPathIndex].elements.slice(
                    currentSelectorPathElementIndex
                  )
                );
                currentSelectorPathIndex++;
              }

              path = path.concat(
                selectorPath.slice(
                  currentSelectorPathIndex,
                  selectorPath.length
                )
              );
              path = path.map(function(currentValue) {
                // we can re-use elements here, because the visibility property matters only for selectors
                var derived = currentValue.createDerived(currentValue.elements);
                if (isVisible) {
                  derived.ensureVisibility();
                } else {
                  derived.ensureInvisibility();
                }
                return derived;
              });
              return path;
            },
            visitMedia: function(mediaNode, visitArgs) {
              var newAllExtends = mediaNode.allExtends.concat(
                this.allExtendsStack[this.allExtendsStack.length - 1]
              );
              newAllExtends = newAllExtends.concat(
                this.doExtendChaining(newAllExtends, mediaNode.allExtends)
              );
              this.allExtendsStack.push(newAllExtends);
            },
            visitMediaOut: function(mediaNode) {
              var lastIndex = this.allExtendsStack.length - 1;
              this.allExtendsStack.length = lastIndex;
            },
            visitDirective: function(directiveNode, visitArgs) {
              var newAllExtends = directiveNode.allExtends.concat(
                this.allExtendsStack[this.allExtendsStack.length - 1]
              );
              newAllExtends = newAllExtends.concat(
                this.doExtendChaining(newAllExtends, directiveNode.allExtends)
              );
              this.allExtendsStack.push(newAllExtends);
            },
            visitDirectiveOut: function(directiveNode) {
              var lastIndex = this.allExtendsStack.length - 1;
              this.allExtendsStack.length = lastIndex;
            }
          };

          module.exports = ProcessExtendsVisitor;
        },
        { "../logger": 33, "../tree": 62, "./visitor": 91 }
      ],
      85: [
        function(require, module, exports) {
          function ImportSequencer(onSequencerEmpty) {
            this.imports = [];
            this.variableImports = [];
            this._onSequencerEmpty = onSequencerEmpty;
            this._currentDepth = 0;
          }

          ImportSequencer.prototype.addImport = function(callback) {
            var importSequencer = this,
              importItem = {
                callback: callback,
                args: null,
                isReady: false
              };
            this.imports.push(importItem);
            return function() {
              importItem.args = Array.prototype.slice.call(arguments, 0);
              importItem.isReady = true;
              importSequencer.tryRun();
            };
          };

          ImportSequencer.prototype.addVariableImport = function(callback) {
            this.variableImports.push(callback);
          };

          ImportSequencer.prototype.tryRun = function() {
            this._currentDepth++;
            try {
              while (true) {
                while (this.imports.length > 0) {
                  var importItem = this.imports[0];
                  if (!importItem.isReady) {
                    return;
                  }
                  this.imports = this.imports.slice(1);
                  importItem.callback.apply(null, importItem.args);
                }
                if (this.variableImports.length === 0) {
                  break;
                }
                var variableImport = this.variableImports[0];
                this.variableImports = this.variableImports.slice(1);
                variableImport();
              }
            } finally {
              this._currentDepth--;
            }
            if (this._currentDepth === 0 && this._onSequencerEmpty) {
              this._onSequencerEmpty();
            }
          };

          module.exports = ImportSequencer;
        },
        {}
      ],
      86: [
        function(require, module, exports) {
          var contexts = require("../contexts"),
            Visitor = require("./visitor"),
            ImportSequencer = require("./import-sequencer");

          var ImportVisitor = function(importer, finish) {
            this._visitor = new Visitor(this);
            this._importer = importer;
            this._finish = finish;
            this.context = new contexts.Eval();
            this.importCount = 0;
            this.onceFileDetectionMap = {};
            this.recursionDetector = {};
            this._sequencer = new ImportSequencer(
              this._onSequencerEmpty.bind(this)
            );
          };

          ImportVisitor.prototype = {
            isReplacing: false,
            run: function(root) {
              try {
                // process the contents
                this._visitor.visit(root);
              } catch (e) {
                this.error = e;
              }

              this.isFinished = true;
              this._sequencer.tryRun();
            },
            _onSequencerEmpty: function() {
              if (!this.isFinished) {
                return;
              }
              this._finish(this.error);
            },
            visitImport: function(importNode, visitArgs) {
              var inlineCSS = importNode.options.inline;

              if (!importNode.css || inlineCSS) {
                var context = new contexts.Eval(
                  this.context,
                  this.context.frames.slice(0)
                );
                var importParent = context.frames[0];

                this.importCount++;
                if (importNode.isVariableImport()) {
                  this._sequencer.addVariableImport(
                    this.processImportNode.bind(
                      this,
                      importNode,
                      context,
                      importParent
                    )
                  );
                } else {
                  this.processImportNode(importNode, context, importParent);
                }
              }
              visitArgs.visitDeeper = false;
            },
            processImportNode: function(importNode, context, importParent) {
              var evaldImportNode,
                inlineCSS = importNode.options.inline;

              try {
                evaldImportNode = importNode.evalForImport(context);
              } catch (e) {
                if (!e.filename) {
                  e.index = importNode.index;
                  e.filename = importNode.currentFileInfo.filename;
                }
                // attempt to eval properly and treat as css
                importNode.css = true;
                // if that fails, this error will be thrown
                importNode.error = e;
              }

              if (evaldImportNode && (!evaldImportNode.css || inlineCSS)) {
                if (evaldImportNode.options.multiple) {
                  context.importMultiple = true;
                }

                // try appending if we haven't determined if it is css or not
                var tryAppendLessExtension = evaldImportNode.css === undefined;

                for (var i = 0; i < importParent.rules.length; i++) {
                  if (importParent.rules[i] === importNode) {
                    importParent.rules[i] = evaldImportNode;
                    break;
                  }
                }

                var onImported = this.onImported.bind(
                    this,
                    evaldImportNode,
                    context
                  ),
                  sequencedOnImported = this._sequencer.addImport(onImported);

                this._importer.push(
                  evaldImportNode.getPath(),
                  tryAppendLessExtension,
                  evaldImportNode.currentFileInfo,
                  evaldImportNode.options,
                  sequencedOnImported
                );
              } else {
                this.importCount--;
                if (this.isFinished) {
                  this._sequencer.tryRun();
                }
              }
            },
            onImported: function(
              importNode,
              context,
              e,
              root,
              importedAtRoot,
              fullPath
            ) {
              if (e) {
                if (!e.filename) {
                  e.index = importNode.index;
                  e.filename = importNode.currentFileInfo.filename;
                }
                this.error = e;
              }

              var importVisitor = this,
                inlineCSS = importNode.options.inline,
                isPlugin = importNode.options.plugin,
                isOptional = importNode.options.optional,
                duplicateImport =
                  importedAtRoot || fullPath in importVisitor.recursionDetector;

              if (!context.importMultiple) {
                if (duplicateImport) {
                  importNode.skip = true;
                } else {
                  importNode.skip = function() {
                    if (fullPath in importVisitor.onceFileDetectionMap) {
                      return true;
                    }
                    importVisitor.onceFileDetectionMap[fullPath] = true;
                    return false;
                  };
                }
              }

              if (!fullPath && isOptional) {
                importNode.skip = true;
              }

              if (root) {
                importNode.root = root;
                importNode.importedFilename = fullPath;

                if (
                  !inlineCSS &&
                  !isPlugin &&
                  (context.importMultiple || !duplicateImport)
                ) {
                  importVisitor.recursionDetector[fullPath] = true;

                  var oldContext = this.context;
                  this.context = context;
                  try {
                    this._visitor.visit(root);
                  } catch (e) {
                    this.error = e;
                  }
                  this.context = oldContext;
                }
              }

              importVisitor.importCount--;

              if (importVisitor.isFinished) {
                importVisitor._sequencer.tryRun();
              }
            },
            visitRule: function(ruleNode, visitArgs) {
              if (ruleNode.value.type === "DetachedRuleset") {
                this.context.frames.unshift(ruleNode);
              } else {
                visitArgs.visitDeeper = false;
              }
            },
            visitRuleOut: function(ruleNode) {
              if (ruleNode.value.type === "DetachedRuleset") {
                this.context.frames.shift();
              }
            },
            visitDirective: function(directiveNode, visitArgs) {
              this.context.frames.unshift(directiveNode);
            },
            visitDirectiveOut: function(directiveNode) {
              this.context.frames.shift();
            },
            visitMixinDefinition: function(mixinDefinitionNode, visitArgs) {
              this.context.frames.unshift(mixinDefinitionNode);
            },
            visitMixinDefinitionOut: function(mixinDefinitionNode) {
              this.context.frames.shift();
            },
            visitRuleset: function(rulesetNode, visitArgs) {
              this.context.frames.unshift(rulesetNode);
            },
            visitRulesetOut: function(rulesetNode) {
              this.context.frames.shift();
            },
            visitMedia: function(mediaNode, visitArgs) {
              this.context.frames.unshift(mediaNode.rules[0]);
            },
            visitMediaOut: function(mediaNode) {
              this.context.frames.shift();
            }
          };
          module.exports = ImportVisitor;
        },
        { "../contexts": 11, "./import-sequencer": 85, "./visitor": 91 }
      ],
      87: [
        function(require, module, exports) {
          var visitors = {
            Visitor: require("./visitor"),
            ImportVisitor: require("./import-visitor"),
            MarkVisibleSelectorsVisitor: require("./set-tree-visibility-visitor"),
            ExtendVisitor: require("./extend-visitor"),
            JoinSelectorVisitor: require("./join-selector-visitor"),
            ToCSSVisitor: require("./to-css-visitor")
          };

          module.exports = visitors;
        },
        {
          "./extend-visitor": 84,
          "./import-visitor": 86,
          "./join-selector-visitor": 88,
          "./set-tree-visibility-visitor": 89,
          "./to-css-visitor": 90,
          "./visitor": 91
        }
      ],
      88: [
        function(require, module, exports) {
          var Visitor = require("./visitor");

          var JoinSelectorVisitor = function() {
            this.contexts = [[]];
            this._visitor = new Visitor(this);
          };

          JoinSelectorVisitor.prototype = {
            run: function(root) {
              return this._visitor.visit(root);
            },
            visitRule: function(ruleNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },
            visitMixinDefinition: function(mixinDefinitionNode, visitArgs) {
              visitArgs.visitDeeper = false;
            },

            visitRuleset: function(rulesetNode, visitArgs) {
              var context = this.contexts[this.contexts.length - 1],
                paths = [],
                selectors;

              this.contexts.push(paths);

              if (!rulesetNode.root) {
                selectors = rulesetNode.selectors;
                if (selectors) {
                  selectors = selectors.filter(function(selector) {
                    return selector.getIsOutput();
                  });
                  rulesetNode.selectors = selectors.length
                    ? selectors
                    : (selectors = null);
                  if (selectors) {
                    rulesetNode.joinSelectors(paths, context, selectors);
                  }
                }
                if (!selectors) {
                  rulesetNode.rules = null;
                }
                rulesetNode.paths = paths;
              }
            },
            visitRulesetOut: function(rulesetNode) {
              this.contexts.length = this.contexts.length - 1;
            },
            visitMedia: function(mediaNode, visitArgs) {
              var context = this.contexts[this.contexts.length - 1];
              mediaNode.rules[0].root =
                context.length === 0 || context[0].multiMedia;
            },
            visitDirective: function(directiveNode, visitArgs) {
              var context = this.contexts[this.contexts.length - 1];
              if (directiveNode.rules && directiveNode.rules.length) {
                directiveNode.rules[0].root =
                  directiveNode.isRooted || context.length === 0 || null;
              }
            }
          };

          module.exports = JoinSelectorVisitor;
        },
        { "./visitor": 91 }
      ],
      89: [
        function(require, module, exports) {
          var SetTreeVisibilityVisitor = function(visible) {
            this.visible = visible;
          };
          SetTreeVisibilityVisitor.prototype.run = function(root) {
            this.visit(root);
          };
          SetTreeVisibilityVisitor.prototype.visitArray = function(nodes) {
            if (!nodes) {
              return nodes;
            }

            var cnt = nodes.length,
              i;
            for (i = 0; i < cnt; i++) {
              this.visit(nodes[i]);
            }
            return nodes;
          };
          SetTreeVisibilityVisitor.prototype.visit = function(node) {
            if (!node) {
              return node;
            }
            if (node.constructor === Array) {
              return this.visitArray(node);
            }

            if (!node.blocksVisibility || node.blocksVisibility()) {
              return node;
            }
            if (this.visible) {
              node.ensureVisibility();
            } else {
              node.ensureInvisibility();
            }

            node.accept(this);
            return node;
          };
          module.exports = SetTreeVisibilityVisitor;
        },
        {}
      ],
      90: [
        function(require, module, exports) {
          var tree = require("../tree"),
            Visitor = require("./visitor");

          var CSSVisitorUtils = function(context) {
            this._visitor = new Visitor(this);
            this._context = context;
          };

          CSSVisitorUtils.prototype = {
            containsSilentNonBlockedChild: function(bodyRules) {
              var rule;
              if (bodyRules == null) {
                return false;
              }
              for (var r = 0; r < bodyRules.length; r++) {
                rule = bodyRules[r];
                if (
                  rule.isSilent &&
                  rule.isSilent(this._context) &&
                  !rule.blocksVisibility()
                ) {
                  //the directive contains something that was referenced (likely by extend)
                  //therefore it needs to be shown in output too
                  return true;
                }
              }
              return false;
            },

            keepOnlyVisibleChilds: function(owner) {
              if (owner == null || owner.rules == null) {
                return;
              }

              owner.rules = owner.rules.filter(function(thing) {
                return thing.isVisible();
              });
            },

            isEmpty: function(owner) {
              if (owner == null || owner.rules == null) {
                return true;
              }
              return owner.rules.length === 0;
            },

            hasVisibleSelector: function(rulesetNode) {
              if (rulesetNode == null || rulesetNode.paths == null) {
                return false;
              }
              return rulesetNode.paths.length > 0;
            },

            resolveVisibility: function(node, originalRules) {
              if (!node.blocksVisibility()) {
                if (
                  this.isEmpty(node) &&
                  !this.containsSilentNonBlockedChild(originalRules)
                ) {
                  return;
                }

                return node;
              }

              var compiledRulesBody = node.rules[0];
              this.keepOnlyVisibleChilds(compiledRulesBody);

              if (this.isEmpty(compiledRulesBody)) {
                return;
              }

              node.ensureVisibility();
              node.removeVisibilityBlock();

              return node;
            },

            isVisibleRuleset: function(rulesetNode) {
              if (rulesetNode.firstRoot) {
                return true;
              }

              if (this.isEmpty(rulesetNode)) {
                return false;
              }

              if (!rulesetNode.root && !this.hasVisibleSelector(rulesetNode)) {
                return false;
              }

              return true;
            }
          };

          var ToCSSVisitor = function(context) {
            this._visitor = new Visitor(this);
            this._context = context;
            this.utils = new CSSVisitorUtils(context);
          };

          ToCSSVisitor.prototype = {
            isReplacing: true,
            run: function(root) {
              return this._visitor.visit(root);
            },

            visitRule: function(ruleNode, visitArgs) {
              if (ruleNode.blocksVisibility() || ruleNode.variable) {
                return;
              }
              return ruleNode;
            },

            visitMixinDefinition: function(mixinNode, visitArgs) {
              // mixin definitions do not get eval'd - this means they keep state
              // so we have to clear that state here so it isn't used if toCSS is called twice
              mixinNode.frames = [];
            },

            visitExtend: function(extendNode, visitArgs) {},

            visitComment: function(commentNode, visitArgs) {
              if (
                commentNode.blocksVisibility() ||
                commentNode.isSilent(this._context)
              ) {
                return;
              }
              return commentNode;
            },

            visitMedia: function(mediaNode, visitArgs) {
              var originalRules = mediaNode.rules[0].rules;
              mediaNode.accept(this._visitor);
              visitArgs.visitDeeper = false;

              return this.utils.resolveVisibility(mediaNode, originalRules);
            },

            visitImport: function(importNode, visitArgs) {
              if (importNode.blocksVisibility()) {
                return;
              }
              return importNode;
            },

            visitDirective: function(directiveNode, visitArgs) {
              if (directiveNode.rules && directiveNode.rules.length) {
                return this.visitDirectiveWithBody(directiveNode, visitArgs);
              } else {
                return this.visitDirectiveWithoutBody(directiveNode, visitArgs);
              }
            },

            visitDirectiveWithBody: function(directiveNode, visitArgs) {
              //if there is only one nested ruleset and that one has no path, then it is
              //just fake ruleset
              function hasFakeRuleset(directiveNode) {
                var bodyRules = directiveNode.rules;
                return (
                  bodyRules.length === 1 &&
                  (!bodyRules[0].paths || bodyRules[0].paths.length === 0)
                );
              }

              function getBodyRules(directiveNode) {
                var nodeRules = directiveNode.rules;
                if (hasFakeRuleset(directiveNode)) {
                  return nodeRules[0].rules;
                }

                return nodeRules;
              }

              //it is still true that it is only one ruleset in array
              //this is last such moment
              //process childs
              var originalRules = getBodyRules(directiveNode);
              directiveNode.accept(this._visitor);
              visitArgs.visitDeeper = false;

              if (!this.utils.isEmpty(directiveNode)) {
                this._mergeRules(directiveNode.rules[0].rules);
              }

              return this.utils.resolveVisibility(directiveNode, originalRules);
            },

            visitDirectiveWithoutBody: function(directiveNode, visitArgs) {
              if (directiveNode.blocksVisibility()) {
                return;
              }

              if (directiveNode.name === "@charset") {
                // Only output the debug info together with subsequent @charset definitions
                // a comment (or @media statement) before the actual @charset directive would
                // be considered illegal css as it has to be on the first line
                if (this.charset) {
                  if (directiveNode.debugInfo) {
                    var comment = new tree.Comment(
                      "/* " +
                        directiveNode.toCSS(this._context).replace(/\n/g, "") +
                        " */\n"
                    );
                    comment.debugInfo = directiveNode.debugInfo;
                    return this._visitor.visit(comment);
                  }
                  return;
                }
                this.charset = true;
              }

              return directiveNode;
            },

            checkValidNodes: function(rules, isRoot) {
              if (!rules) {
                return;
              }

              for (var i = 0; i < rules.length; i++) {
                var ruleNode = rules[i];
                if (
                  isRoot &&
                  ruleNode instanceof tree.Rule &&
                  !ruleNode.variable
                ) {
                  throw {
                    message:
                      "Properties must be inside selector blocks. They cannot be in the root",
                    index: ruleNode.index,
                    filename:
                      ruleNode.currentFileInfo &&
                      ruleNode.currentFileInfo.filename
                  };
                }
                if (ruleNode instanceof tree.Call) {
                  throw {
                    message: "Function '" + ruleNode.name + "' is undefined",
                    index: ruleNode.index,
                    filename:
                      ruleNode.currentFileInfo &&
                      ruleNode.currentFileInfo.filename
                  };
                }
                if (ruleNode.type && !ruleNode.allowRoot) {
                  throw {
                    message:
                      ruleNode.type +
                      " node returned by a function is not valid here",
                    index: ruleNode.index,
                    filename:
                      ruleNode.currentFileInfo &&
                      ruleNode.currentFileInfo.filename
                  };
                }
              }
            },

            visitRuleset: function(rulesetNode, visitArgs) {
              //at this point rulesets are nested into each other
              var rule,
                rulesets = [];

              this.checkValidNodes(rulesetNode.rules, rulesetNode.firstRoot);

              if (!rulesetNode.root) {
                //remove invisible paths
                this._compileRulesetPaths(rulesetNode);

                // remove rulesets from this ruleset body and compile them separately
                var nodeRules = rulesetNode.rules,
                  nodeRuleCnt = nodeRules ? nodeRules.length : 0;
                for (var i = 0; i < nodeRuleCnt; ) {
                  rule = nodeRules[i];
                  if (rule && rule.rules) {
                    // visit because we are moving them out from being a child
                    rulesets.push(this._visitor.visit(rule));
                    nodeRules.splice(i, 1);
                    nodeRuleCnt--;
                    continue;
                  }
                  i++;
                }
                // accept the visitor to remove rules and refactor itself
                // then we can decide nogw whether we want it or not
                // compile body
                if (nodeRuleCnt > 0) {
                  rulesetNode.accept(this._visitor);
                } else {
                  rulesetNode.rules = null;
                }
                visitArgs.visitDeeper = false;
              } else {
                //if (! rulesetNode.root) {
                rulesetNode.accept(this._visitor);
                visitArgs.visitDeeper = false;
              }

              if (rulesetNode.rules) {
                this._mergeRules(rulesetNode.rules);
                this._removeDuplicateRules(rulesetNode.rules);
              }

              //now decide whether we keep the ruleset
              if (this.utils.isVisibleRuleset(rulesetNode)) {
                rulesetNode.ensureVisibility();
                rulesets.splice(0, 0, rulesetNode);
              }

              if (rulesets.length === 1) {
                return rulesets[0];
              }
              return rulesets;
            },

            _compileRulesetPaths: function(rulesetNode) {
              if (rulesetNode.paths) {
                rulesetNode.paths = rulesetNode.paths.filter(function(p) {
                  var i;
                  if (p[0].elements[0].combinator.value === " ") {
                    p[0].elements[0].combinator = new tree.Combinator("");
                  }
                  for (i = 0; i < p.length; i++) {
                    if (p[i].isVisible() && p[i].getIsOutput()) {
                      return true;
                    }
                  }
                  return false;
                });
              }
            },

            _removeDuplicateRules: function(rules) {
              if (!rules) {
                return;
              }

              // remove duplicates
              var ruleCache = {},
                ruleList,
                rule,
                i;

              for (i = rules.length - 1; i >= 0; i--) {
                rule = rules[i];
                if (rule instanceof tree.Rule) {
                  if (!ruleCache[rule.name]) {
                    ruleCache[rule.name] = rule;
                  } else {
                    ruleList = ruleCache[rule.name];
                    if (ruleList instanceof tree.Rule) {
                      ruleList = ruleCache[rule.name] = [
                        ruleCache[rule.name].toCSS(this._context)
                      ];
                    }
                    var ruleCSS = rule.toCSS(this._context);
                    if (ruleList.indexOf(ruleCSS) !== -1) {
                      rules.splice(i, 1);
                    } else {
                      ruleList.push(ruleCSS);
                    }
                  }
                }
              }
            },

            _mergeRules: function(rules) {
              if (!rules) {
                return;
              }

              var groups = {},
                parts,
                rule,
                key;

              for (var i = 0; i < rules.length; i++) {
                rule = rules[i];

                if (rule instanceof tree.Rule && rule.merge) {
                  key = [rule.name, rule.important ? "!" : ""].join(",");

                  if (!groups[key]) {
                    groups[key] = [];
                  } else {
                    rules.splice(i--, 1);
                  }

                  groups[key].push(rule);
                }
              }

              Object.keys(groups).map(function(k) {
                function toExpression(values) {
                  return new tree.Expression(
                    values.map(function(p) {
                      return p.value;
                    })
                  );
                }

                function toValue(values) {
                  return new tree.Value(
                    values.map(function(p) {
                      return p;
                    })
                  );
                }

                parts = groups[k];

                if (parts.length > 1) {
                  rule = parts[0];
                  var spacedGroups = [];
                  var lastSpacedGroup = [];
                  parts.map(function(p) {
                    if (p.merge === "+") {
                      if (lastSpacedGroup.length > 0) {
                        spacedGroups.push(toExpression(lastSpacedGroup));
                      }
                      lastSpacedGroup = [];
                    }
                    lastSpacedGroup.push(p);
                  });
                  spacedGroups.push(toExpression(lastSpacedGroup));
                  rule.value = toValue(spacedGroups);
                }
              });
            },

            visitAnonymous: function(anonymousNode, visitArgs) {
              if (anonymousNode.blocksVisibility()) {
                return;
              }
              anonymousNode.accept(this._visitor);
              return anonymousNode;
            }
          };

          module.exports = ToCSSVisitor;
        },
        { "../tree": 62, "./visitor": 91 }
      ],
      91: [
        function(require, module, exports) {
          var tree = require("../tree");

          var _visitArgs = { visitDeeper: true },
            _hasIndexed = false;

          function _noop(node) {
            return node;
          }

          function indexNodeTypes(parent, ticker) {
            // add .typeIndex to tree node types for lookup table
            var key, child;
            for (key in parent) {
              if (parent.hasOwnProperty(key)) {
                child = parent[key];
                switch (typeof child) {
                  case "function":
                    // ignore bound functions directly on tree which do not have a prototype
                    // or aren't nodes
                    if (child.prototype && child.prototype.type) {
                      child.prototype.typeIndex = ticker++;
                    }
                    break;
                  case "object":
                    ticker = indexNodeTypes(child, ticker);
                    break;
                }
              }
            }
            return ticker;
          }

          var Visitor = function(implementation) {
            this._implementation = implementation;
            this._visitFnCache = [];

            if (!_hasIndexed) {
              indexNodeTypes(tree, 1);
              _hasIndexed = true;
            }
          };

          Visitor.prototype = {
            visit: function(node) {
              if (!node) {
                return node;
              }

              var nodeTypeIndex = node.typeIndex;
              if (!nodeTypeIndex) {
                return node;
              }

              var visitFnCache = this._visitFnCache,
                impl = this._implementation,
                aryIndx = nodeTypeIndex << 1,
                outAryIndex = aryIndx | 1,
                func = visitFnCache[aryIndx],
                funcOut = visitFnCache[outAryIndex],
                visitArgs = _visitArgs,
                fnName;

              visitArgs.visitDeeper = true;

              if (!func) {
                fnName = "visit" + node.type;
                func = impl[fnName] || _noop;
                funcOut = impl[fnName + "Out"] || _noop;
                visitFnCache[aryIndx] = func;
                visitFnCache[outAryIndex] = funcOut;
              }

              if (func !== _noop) {
                var newNode = func.call(impl, node, visitArgs);
                if (impl.isReplacing) {
                  node = newNode;
                }
              }

              if (visitArgs.visitDeeper && node && node.accept) {
                node.accept(this);
              }

              if (funcOut != _noop) {
                funcOut.call(impl, node);
              }

              return node;
            },
            visitArray: function(nodes, nonReplacing) {
              if (!nodes) {
                return nodes;
              }

              var cnt = nodes.length,
                i;

              // Non-replacing
              if (nonReplacing || !this._implementation.isReplacing) {
                for (i = 0; i < cnt; i++) {
                  this.visit(nodes[i]);
                }
                return nodes;
              }

              // Replacing
              var out = [];
              for (i = 0; i < cnt; i++) {
                var evald = this.visit(nodes[i]);
                if (evald === undefined) {
                  continue;
                }
                if (!evald.splice) {
                  out.push(evald);
                } else if (evald.length) {
                  this.flatten(evald, out);
                }
              }
              return out;
            },
            flatten: function(arr, out) {
              if (!out) {
                out = [];
              }

              var cnt, i, item, nestedCnt, j, nestedItem;

              for (i = 0, cnt = arr.length; i < cnt; i++) {
                item = arr[i];
                if (item === undefined) {
                  continue;
                }
                if (!item.splice) {
                  out.push(item);
                  continue;
                }

                for (j = 0, nestedCnt = item.length; j < nestedCnt; j++) {
                  nestedItem = item[j];
                  if (nestedItem === undefined) {
                    continue;
                  }
                  if (!nestedItem.splice) {
                    out.push(nestedItem);
                  } else if (nestedItem.length) {
                    this.flatten(nestedItem, out);
                  }
                }
              }

              return out;
            }
          };
          module.exports = Visitor;
        },
        { "../tree": 62 }
      ],
      92: [
        function(require, module, exports) {
          "use strict";

          // rawAsap provides everything we need except exception management.
          var rawAsap = require("./raw");
          // RawTasks are recycled to reduce GC churn.
          var freeTasks = [];
          // We queue errors to ensure they are thrown in right order (FIFO).
          // Array-as-queue is good enough here, since we are just dealing with exceptions.
          var pendingErrors = [];
          var requestErrorThrow = rawAsap.makeRequestCallFromTimer(
            throwFirstError
          );

          function throwFirstError() {
            if (pendingErrors.length) {
              throw pendingErrors.shift();
            }
          }

          /**
           * Calls a task as soon as possible after returning, in its own event, with priority
           * over other events like animation, reflow, and repaint. An error thrown from an
           * event will not interrupt, nor even substantially slow down the processing of
           * other events, but will be rather postponed to a lower priority event.
           * @param {{call}} task A callable object, typically a function that takes no
           * arguments.
           */
          module.exports = asap;

          function asap(task) {
            var rawTask;
            if (freeTasks.length) {
              rawTask = freeTasks.pop();
            } else {
              rawTask = new RawTask();
            }
            rawTask.task = task;
            rawAsap(rawTask);
          }

          // We wrap tasks with recyclable task objects.  A task object implements
          // `call`, just like a function.
          function RawTask() {
            this.task = null;
          }

          // The sole purpose of wrapping the task is to catch the exception and recycle
          // the task object after its single use.
          RawTask.prototype.call = function() {
            try {
              this.task.call();
            } catch (error) {
              if (asap.onerror) {
                // This hook exists purely for testing purposes.
                // Its name will be periodically randomized to break any code that
                // depends on its existence.
                asap.onerror(error);
              } else {
                // In a web browser, exceptions are not fatal. However, to avoid
                // slowing down the queue of pending tasks, we rethrow the error in a
                // lower priority turn.
                pendingErrors.push(error);
                requestErrorThrow();
              }
            } finally {
              this.task = null;
              freeTasks[freeTasks.length] = this;
            }
          };
        },
        { "./raw": 93 }
      ],
      93: [
        function(require, module, exports) {
          (function(global) {
            "use strict";

            // Use the fastest means possible to execute a task in its own turn, with
            // priority over other events including IO, animation, reflow, and redraw
            // events in browsers.
            //
            // An exception thrown by a task will permanently interrupt the processing of
            // subsequent tasks. The higher level `asap` function ensures that if an
            // exception is thrown by a task, that the task queue will continue flushing as
            // soon as possible, but if you use `rawAsap` directly, you are responsible to
            // either ensure that no exceptions are thrown from your task, or to manually
            // call `rawAsap.requestFlush` if an exception is thrown.
            module.exports = rawAsap;

            function rawAsap(task) {
              if (!queue.length) {
                requestFlush();
                flushing = true;
              }
              // Equivalent to push, but avoids a function call.
              queue[queue.length] = task;
            }

            var queue = [];
            // Once a flush has been requested, no further calls to `requestFlush` are
            // necessary until the next `flush` completes.
            var flushing = false;
            // `requestFlush` is an implementation-specific method that attempts to kick
            // off a `flush` event as quickly as possible. `flush` will attempt to exhaust
            // the event queue before yielding to the browser's own event loop.
            var requestFlush;
            // The position of the next task to execute in the task queue. This is
            // preserved between calls to `flush` so that it can be resumed if
            // a task throws an exception.
            var index = 0;
            // If a task schedules additional tasks recursively, the task queue can grow
            // unbounded. To prevent memory exhaustion, the task queue will periodically
            // truncate already-completed tasks.
            var capacity = 1024;

            // The flush function processes all tasks that have been scheduled with
            // `rawAsap` unless and until one of those tasks throws an exception.
            // If a task throws an exception, `flush` ensures that its state will remain
            // consistent and will resume where it left off when called again.
            // However, `flush` does not make any arrangements to be called again if an
            // exception is thrown.
            function flush() {
              while (index < queue.length) {
                var currentIndex = index;
                // Advance the index before calling the task. This ensures that we will
                // begin flushing on the next task the task throws an error.
                index = index + 1;
                queue[currentIndex].call();
                // Prevent leaking memory for long chains of recursive calls to `asap`.
                // If we call `asap` within tasks scheduled by `asap`, the queue will
                // grow, but to avoid an O(n) walk for every task we execute, we don't
                // shift tasks off the queue after they have been executed.
                // Instead, we periodically shift 1024 tasks off the queue.
                if (index > capacity) {
                  // Manually shift all values starting at the index back to the
                  // beginning of the queue.
                  for (
                    var scan = 0, newLength = queue.length - index;
                    scan < newLength;
                    scan++
                  ) {
                    queue[scan] = queue[scan + index];
                  }
                  queue.length -= index;
                  index = 0;
                }
              }
              queue.length = 0;
              index = 0;
              flushing = false;
            }

            // `requestFlush` is implemented using a strategy based on data collected from
            // every available SauceLabs Selenium web driver worker at time of writing.
            // https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593

            // Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
            // have WebKitMutationObserver but not un-prefixed MutationObserver.
            // Must use `global` or `self` instead of `window` to work in both frames and web
            // workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.

            /* globals self */
            var scope = typeof global !== "undefined" ? global : self;
            var BrowserMutationObserver =
              scope.MutationObserver || scope.WebKitMutationObserver;

            // MutationObservers are desirable because they have high priority and work
            // reliably everywhere they are implemented.
            // They are implemented in all modern browsers.
            //
            // - Android 4-4.3
            // - Chrome 26-34
            // - Firefox 14-29
            // - Internet Explorer 11
            // - iPad Safari 6-7.1
            // - iPhone Safari 7-7.1
            // - Safari 6-7
            if (typeof BrowserMutationObserver === "function") {
              requestFlush = makeRequestCallFromMutationObserver(flush);

              // MessageChannels are desirable because they give direct access to the HTML
              // task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
              // 11-12, and in web workers in many engines.
              // Although message channels yield to any queued rendering and IO tasks, they
              // would be better than imposing the 4ms delay of timers.
              // However, they do not work reliably in Internet Explorer or Safari.

              // Internet Explorer 10 is the only browser that has setImmediate but does
              // not have MutationObservers.
              // Although setImmediate yields to the browser's renderer, it would be
              // preferrable to falling back to setTimeout since it does not have
              // the minimum 4ms penalty.
              // Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
              // Desktop to a lesser extent) that renders both setImmediate and
              // MessageChannel useless for the purposes of ASAP.
              // https://github.com/kriskowal/q/issues/396

              // Timers are implemented universally.
              // We fall back to timers in workers in most engines, and in foreground
              // contexts in the following browsers.
              // However, note that even this simple case requires nuances to operate in a
              // broad spectrum of browsers.
              //
              // - Firefox 3-13
              // - Internet Explorer 6-9
              // - iPad Safari 4.3
              // - Lynx 2.8.7
            } else {
              requestFlush = makeRequestCallFromTimer(flush);
            }

            // `requestFlush` requests that the high priority event queue be flushed as
            // soon as possible.
            // This is useful to prevent an error thrown in a task from stalling the event
            // queue if the exception handled by Node.js’s
            // `process.on("uncaughtException")` or by a domain.
            rawAsap.requestFlush = requestFlush;

            // To request a high priority event, we induce a mutation observer by toggling
            // the text of a text node between "1" and "-1".
            function makeRequestCallFromMutationObserver(callback) {
              var toggle = 1;
              var observer = new BrowserMutationObserver(callback);
              var node = document.createTextNode("");
              observer.observe(node, { characterData: true });
              return function requestCall() {
                toggle = -toggle;
                node.data = toggle;
              };
            }

            // The message channel technique was discovered by Malte Ubl and was the
            // original foundation for this library.
            // http://www.nonblocking.io/2011/06/windownexttick.html

            // Safari 6.0.5 (at least) intermittently fails to create message ports on a
            // page's first load. Thankfully, this version of Safari supports
            // MutationObservers, so we don't need to fall back in that case.

            // function makeRequestCallFromMessageChannel(callback) {
            //     var channel = new MessageChannel();
            //     channel.port1.onmessage = callback;
            //     return function requestCall() {
            //         channel.port2.postMessage(0);
            //     };
            // }

            // For reasons explained above, we are also unable to use `setImmediate`
            // under any circumstances.
            // Even if we were, there is another bug in Internet Explorer 10.
            // It is not sufficient to assign `setImmediate` to `requestFlush` because
            // `setImmediate` must be called *by name* and therefore must be wrapped in a
            // closure.
            // Never forget.

            // function makeRequestCallFromSetImmediate(callback) {
            //     return function requestCall() {
            //         setImmediate(callback);
            //     };
            // }

            // Safari 6.0 has a problem where timers will get lost while the user is
            // scrolling. This problem does not impact ASAP because Safari 6.0 supports
            // mutation observers, so that implementation is used instead.
            // However, if we ever elect to use timers in Safari, the prevalent work-around
            // is to add a scroll event listener that calls for a flush.

            // `setTimeout` does not call the passed callback if the delay is less than
            // approximately 7 in web workers in Firefox 8 through 18, and sometimes not
            // even then.

            function makeRequestCallFromTimer(callback) {
              return function requestCall() {
                // We dispatch a timeout with a specified delay of 0 for engines that
                // can reliably accommodate that request. This will usually be snapped
                // to a 4 milisecond delay, but once we're flushing, there's no delay
                // between events.
                var timeoutHandle = setTimeout(handleTimer, 0);
                // However, since this timer gets frequently dropped in Firefox
                // workers, we enlist an interval handle that will try to fire
                // an event 20 times per second until it succeeds.
                var intervalHandle = setInterval(handleTimer, 50);

                function handleTimer() {
                  // Whichever timer succeeds will cancel both timers and
                  // execute the callback.
                  clearTimeout(timeoutHandle);
                  clearInterval(intervalHandle);
                  callback();
                }
              };
            }

            // This is for `asap.js` only.
            // Its name will be periodically randomized to break any code that depends on
            // its existence.
            rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;

            // ASAP was originally a nextTick shim included in Q. This was factored out
            // into this ASAP package. It was later adapted to RSVP which made further
            // amendments. These decisions, particularly to marginalize MessageChannel and
            // to capture the MutationObserver implementation in a closure, were integrated
            // back into ASAP proper.
            // https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js
          }.call(
            this,
            typeof global !== "undefined"
              ? global
              : typeof self !== "undefined"
              ? self
              : typeof window !== "undefined"
              ? window
              : {}
          ));
        },
        {}
      ],
      94: [
        function(require, module, exports) {
          "use strict";

          var asap = require("asap/raw");

          function noop() {}

          // States:
          //
          // 0 - pending
          // 1 - fulfilled with _value
          // 2 - rejected with _value
          // 3 - adopted the state of another promise, _value
          //
          // once the state is no longer pending (0) it is immutable

          // All `_` prefixed properties will be reduced to `_{random number}`
          // at build time to obfuscate them and discourage their use.
          // We don't use symbols or Object.defineProperty to fully hide them
          // because the performance isn't good enough.

          // to avoid using try/catch inside critical functions, we
          // extract them to here.
          var LAST_ERROR = null;
          var IS_ERROR = {};

          function getThen(obj) {
            try {
              return obj.then;
            } catch (ex) {
              LAST_ERROR = ex;
              return IS_ERROR;
            }
          }

          function tryCallOne(fn, a) {
            try {
              return fn(a);
            } catch (ex) {
              LAST_ERROR = ex;
              return IS_ERROR;
            }
          }

          function tryCallTwo(fn, a, b) {
            try {
              fn(a, b);
            } catch (ex) {
              LAST_ERROR = ex;
              return IS_ERROR;
            }
          }

          module.exports = Promise;

          function Promise(fn) {
            if (typeof this !== "object") {
              throw new TypeError("Promises must be constructed via new");
            }
            if (typeof fn !== "function") {
              throw new TypeError(
                "Promise constructor's argument is not a function"
              );
            }
            this._40 = 0;
            this._65 = 0;
            this._55 = null;
            this._72 = null;
            if (fn === noop) return;
            doResolve(fn, this);
          }

          Promise._37 = null;
          Promise._87 = null;
          Promise._61 = noop;

          Promise.prototype.then = function(onFulfilled, onRejected) {
            if (this.constructor !== Promise) {
              return safeThen(this, onFulfilled, onRejected);
            }
            var res = new Promise(noop);
            handle(this, new Handler(onFulfilled, onRejected, res));
            return res;
          };

          function safeThen(self, onFulfilled, onRejected) {
            return new self.constructor(function(resolve, reject) {
              var res = new Promise(noop);
              res.then(resolve, reject);
              handle(self, new Handler(onFulfilled, onRejected, res));
            });
          }

          function handle(self, deferred) {
            while (self._65 === 3) {
              self = self._55;
            }
            if (Promise._37) {
              Promise._37(self);
            }
            if (self._65 === 0) {
              if (self._40 === 0) {
                self._40 = 1;
                self._72 = deferred;
                return;
              }
              if (self._40 === 1) {
                self._40 = 2;
                self._72 = [self._72, deferred];
                return;
              }
              self._72.push(deferred);
              return;
            }
            handleResolved(self, deferred);
          }

          function handleResolved(self, deferred) {
            asap(function() {
              var cb =
                self._65 === 1 ? deferred.onFulfilled : deferred.onRejected;
              if (cb === null) {
                if (self._65 === 1) {
                  resolve(deferred.promise, self._55);
                } else {
                  reject(deferred.promise, self._55);
                }
                return;
              }
              var ret = tryCallOne(cb, self._55);
              if (ret === IS_ERROR) {
                reject(deferred.promise, LAST_ERROR);
              } else {
                resolve(deferred.promise, ret);
              }
            });
          }

          function resolve(self, newValue) {
            // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
            if (newValue === self) {
              return reject(
                self,
                new TypeError("A promise cannot be resolved with itself.")
              );
            }
            if (
              newValue &&
              (typeof newValue === "object" || typeof newValue === "function")
            ) {
              var then = getThen(newValue);
              if (then === IS_ERROR) {
                return reject(self, LAST_ERROR);
              }
              if (then === self.then && newValue instanceof Promise) {
                self._65 = 3;
                self._55 = newValue;
                finale(self);
                return;
              } else if (typeof then === "function") {
                doResolve(then.bind(newValue), self);
                return;
              }
            }
            self._65 = 1;
            self._55 = newValue;
            finale(self);
          }

          function reject(self, newValue) {
            self._65 = 2;
            self._55 = newValue;
            if (Promise._87) {
              Promise._87(self, newValue);
            }
            finale(self);
          }

          function finale(self) {
            if (self._40 === 1) {
              handle(self, self._72);
              self._72 = null;
            }
            if (self._40 === 2) {
              for (var i = 0; i < self._72.length; i++) {
                handle(self, self._72[i]);
              }
              self._72 = null;
            }
          }

          function Handler(onFulfilled, onRejected, promise) {
            this.onFulfilled =
              typeof onFulfilled === "function" ? onFulfilled : null;
            this.onRejected =
              typeof onRejected === "function" ? onRejected : null;
            this.promise = promise;
          }

          /**
           * Take a potentially misbehaving resolver function and make sure
           * onFulfilled and onRejected are only called once.
           *
           * Makes no guarantees about asynchrony.
           */
          function doResolve(fn, promise) {
            var done = false;
            var res = tryCallTwo(
              fn,
              function(value) {
                if (done) return;
                done = true;
                resolve(promise, value);
              },
              function(reason) {
                if (done) return;
                done = true;
                reject(promise, reason);
              }
            );
            if (!done && res === IS_ERROR) {
              done = true;
              reject(promise, LAST_ERROR);
            }
          }
        },
        { "asap/raw": 93 }
      ],
      95: [
        function(require, module, exports) {
          "use strict";

          //This file contains the ES6 extensions to the core Promises/A+ API

          var Promise = require("./core.js");

          module.exports = Promise;

          /* Static Functions */

          var TRUE = valuePromise(true);
          var FALSE = valuePromise(false);
          var NULL = valuePromise(null);
          var UNDEFINED = valuePromise(undefined);
          var ZERO = valuePromise(0);
          var EMPTYSTRING = valuePromise("");

          function valuePromise(value) {
            var p = new Promise(Promise._61);
            p._65 = 1;
            p._55 = value;
            return p;
          }

          Promise.resolve = function(value) {
            if (value instanceof Promise) return value;

            if (value === null) return NULL;
            if (value === undefined) return UNDEFINED;
            if (value === true) return TRUE;
            if (value === false) return FALSE;
            if (value === 0) return ZERO;
            if (value === "") return EMPTYSTRING;

            if (typeof value === "object" || typeof value === "function") {
              try {
                var then = value.then;
                if (typeof then === "function") {
                  return new Promise(then.bind(value));
                }
              } catch (ex) {
                return new Promise(function(resolve, reject) {
                  reject(ex);
                });
              }
            }
            return valuePromise(value);
          };

          Promise.all = function(arr) {
            var args = Array.prototype.slice.call(arr);

            return new Promise(function(resolve, reject) {
              if (args.length === 0) return resolve([]);
              var remaining = args.length;

              function res(i, val) {
                if (
                  val &&
                  (typeof val === "object" || typeof val === "function")
                ) {
                  if (
                    val instanceof Promise &&
                    val.then === Promise.prototype.then
                  ) {
                    while (val._65 === 3) {
                      val = val._55;
                    }
                    if (val._65 === 1) return res(i, val._55);
                    if (val._65 === 2) reject(val._55);
                    val.then(function(val) {
                      res(i, val);
                    }, reject);
                    return;
                  } else {
                    var then = val.then;
                    if (typeof then === "function") {
                      var p = new Promise(then.bind(val));
                      p.then(function(val) {
                        res(i, val);
                      }, reject);
                      return;
                    }
                  }
                }
                args[i] = val;
                if (--remaining === 0) {
                  resolve(args);
                }
              }

              for (var i = 0; i < args.length; i++) {
                res(i, args[i]);
              }
            });
          };

          Promise.reject = function(value) {
            return new Promise(function(resolve, reject) {
              reject(value);
            });
          };

          Promise.race = function(values) {
            return new Promise(function(resolve, reject) {
              values.forEach(function(value) {
                Promise.resolve(value).then(resolve, reject);
              });
            });
          };

          /* Prototype Methods */

          Promise.prototype["catch"] = function(onRejected) {
            return this.then(null, onRejected);
          };
        },
        { "./core.js": 94 }
      ],
      96: [
        function(require, module, exports) {
          // should work in any browser without browserify

          if (typeof Promise.prototype.done !== "function") {
            Promise.prototype.done = function(onFulfilled, onRejected) {
              var self = arguments.length
                ? this.then.apply(this, arguments)
                : this;
              self.then(null, function(err) {
                setTimeout(function() {
                  throw err;
                }, 0);
              });
            };
          }
        },
        {}
      ],
      97: [
        function(require, module, exports) {
          // not "use strict" so we can declare global "Promise"

          var asap = require("asap");

          if (typeof Promise === "undefined") {
            Promise = require("./lib/core.js");
            require("./lib/es6-extensions.js");
          }

          require("./polyfill-done.js");
        },
        {
          "./lib/core.js": 94,
          "./lib/es6-extensions.js": 95,
          "./polyfill-done.js": 96,
          asap: 92
        }
      ]
    },
    {},
    [2]
  )(2);
});
