\input ptb-utils
\input ptb-pdfData

\createarray{available fonts}

\def\___setfontsizes#1#2#3{%
    \def\_temp{#2}%
    \def\_tempA{default}%
    \font\@@=#3\relax%
    \ifx\_temp\_tempA%
        \_xp\edef\csname #1 default\endcsname{#3}%
    \else%
        \_xp\edef\csname #1 at #2\endcsname{#3}%
    \fi%
}

\def\__setfontsizes#1#2{%
    \ifx\_nul#2%
    \else%
        \___setfontsizes{#1}#2%
        \_afterfi{\__setfontsizes{#1}}%
    \fi%
}

\def\_setfontsizes#1#2{%
    \def\_temp{\__setfontsizes{#1}}%
    \_xp\_temp#2\_nul%
}

\def\addfont#1#2{%
    \_mapkeys_with_setter\_vanilla_mapkey\lastkeys{#2}%
    \keyexists{default}\_defaultcode\lastkeys%
    \ifx\_defaultcode\_nul%
        {\newlinechar=`^^J
            \errhelp={Default codes are used for when a specific font size is not specified but requested, in which case the default code is scaled up to the requested font size.^^J%
            For example, if the font name is `rm', the default code may be `cmr10'.^^J%
            If a font size of 20 is requested, but not specified, then the font `cmr10 at 20pt' will be utilized.}%
            \errmessage{Default code was not specified}%
        }%
    \fi%
    \_setfontsizes{#1}\lastkeys%
    \appendarray{available fonts}{#1}%
}

\def\applyfontcode{\afterassignment\@@ \font\@@}

\def\getfontcode#1#2{%
    \ifcsname #1 at #2\endcsname%
        \csname #1 at #2\endcsname%
    \else%
        \csname #1 default\endcsname\_space at #2
    \fi%
}

\def\textfontcalc#1{\def\fontsize{#1}}
\def\scriptfontcalc#1{\edef\fontsize{\the\dimexpr #1 * 7 / 10\relax}}
\def\scriptscriptfontcalc#1{\edef\fontsize{\the\dimexpr #1 / 2\relax}}

%   #1: Family
%   #2: Font
\def\_setfontfamily#1#2{%
    \textfontcalc{\currscale}%
    \expanded{\noexpand\font\noexpand\@@=\getfontcode{#2}{\fontsize}}%
    \textfont#1=\@@%
    \scriptfontcalc{\currscale}%
    \expanded{\noexpand\font\noexpand\@@=\getfontcode{#2}{\fontsize}}%
    \scriptfont#1=\@@%
    \scriptscriptfontcalc{\currscale}%
    \expanded{\noexpand\font\noexpand\@@=\getfontcode{#2}{\fontsize}}%
    \scriptscriptfont#1=\@@%
}

\def\_rsetfontfamily#1#2#3{\_setfontfamily{#2}{#1}}

\createarray{math@fonts}

\def\setfontfamily#1#2{%
    \ifcsname family@#1@font\endcsname%
        \removeitemarray{font@\csname family@#1@font\endcsname @family}{#1}%
    \fi%
    \_setfontfamily{#1}{#2}%
    \_xp\def\csname family@#1@font\endcsname{#2}%
    \ensurearray{font@#2@family}%
    \appendarray{font@#2@family}{#1}%
    \appendarray{math@fonts}{#2}%
}

\def\_updatefontfamily#1#2{%
    \arraymap{font@#1@family}{\_rsetfontfamily{#1}}%
}

\def\updatefontfamilies{%
    \arraymap{math@fonts}\_updatefontfamily%
}

\def\_setfont_and_scale#1#2{%
    \applyfontcode\getfontcode{#1}{#2}\relax%
}

\protected\def\setfont#1{%
    \edef\currfont{#1}%
    \_setfont_and_scale\currfont\currscale%
}

\protected\def\setscale#1{%
    \edef\currscale{\the\dimexpr#1\relax}%
    \_setfont_and_scale\currfont\currscale%
    \updatefontfamilies%
}

\protected\def\setfontandscale#1#2{%
    \edef\currfont{#1}%
    \edef\currscale{\the\dimexpr#2\relax}%
    \_setfont_and_scale\currfont\currscale%
    \updatefontfamilies%
}

\addfont{rm}{%
    default=cmr10,
    5pt=cmr5,
    6pt=cmr6,
    7pt=cmr7,
    8pt=cmr8,
    9pt=cmr9,
    10pt=cmr10,
    12pt=cmr12,
    17pt=cmr17
}

\addfont{it}{%
    default=cmti10,
    7pt=cmti7,
    8pt=cmti8,
    9pt=cmti9,
    10pt=cmti10,
    12pt=cmti12
}

\addfont{bf}{%
    default=cmbx10,
    5pt=cmbx5,
    6pt=cmbx6,
    7pt=cmbx7,
    8pt=cmbx8,
    9pt=cmbx9,
    10pt=cmbx10,
    12pt=cmbx12
}

\addfont{sc}{%
    default=cmcsc10,
    8pt=cmcsc8,
    9pt=cmcsc9,
    10pt=cmcsc10
}

\addfont{mi}{%
    default=cmmi10,
    5pt=cmmi5,
    6pt=cmmi6,
    7pt=cmmi7,
    8pt=cmmi8,
    9pt=cmmi9,
    10pt=cmmi10,
    12pt=cmmi12
}

\addfont{sy}{%
    default=cmsy10,
    5pt=cmsy5,
    6pt=cmsy6,
    7pt=cmsy7,
    8pt=cmsy8,
    9pt=cmsy9,
    10pt=cmsy10
}

\addfont{ex}{%
    default=cmex10,
    7pt=cmex7,
    8pt=cmex8,
    9pt=cmex9,
    10pt=cmex10
}

\addfont{sl}{%
    default=cmsl10,
    8pt=cmsl8,
    9pt=cmsl9,
    10pt=cmsl10,
    12pt=cmsl12
}

\addfont{ss}{%
    default=cmss10,
    8pt=cmss8,
    9pt=cmss9,
    10pt=cmss10,
    12pt=cmss12
}

\addfont{tt}{%
    default=cmtt10,
    8pt=cmtt8,
    9pt=cmtt9,
    10pt=cmtt10,
    12pt=cmtt12
}

\addfont{sl}{%
    default=cmsl10,
    8pt=cmsl8,
    9pt=cmsl9,
    10pt=cmsl10,
    12pt=cmsl12
}

\addfont{msam}{%
    default=msam10,
    8pt=msam8,
    9pt=msam9,
    10pt=msam10
}

\addfont{msbm}{%
    default=msbm10,
    8pt=msbm8,
    9pt=msbm9,
    10pt=msbm10
}

\addfont{eufm}{%
    default=eufm10,
    8pt=eufm8,
    9pt=eufm9,
    10pt=eufm10
}

\addfont{rsfs}{
    default=rsfs10,
    10pt=rsfs10
}

\setfontandscale{rm}{10pt}
\setfontfamily{0}{rm}
\setfontfamily{1}{mi}
\setfontfamily{2}{sy}
\setfontfamily{3}{ex}
\setfontfamily{4}{msam}
\setfontfamily{5}{msbm}
\setfontfamily{6}{bf}
\setfontfamily{7}{tt}
\setfontfamily{8}{it}
\setfontfamily{9}{ss}
\setfontfamily{10}{sl}
\setfontfamily{11}{eufm}
\setfontfamily{12}{rsfs}
\def\bf{\setfont{bf}\fam=6\relax}
\def\it{\setfont{it}\fam=8\relax}
\def\bb{\fam=5\relax}
\def\sf{\setfont{ss}\fam=9\relax}
\def\sl{\setfont{sl}\fam=10\relax}
\def\frak{\setfont{eufm}\fam=11\relax}
\def\scr{\setfont{rsfs}\fam=12\relax}

\def\__{\__}

\def\__mathftable#1#2#3{%
    \mathchardef#2=\the\numexpr"#3#100 + \the\_ptbcountA\relax%
    \advance\_ptbcountA by 1\relax%
    \_mathftable{#1}%
}

\def\_mathftable#1#2{%
    \ifx\_nul#2%
    \else%
        \_afterfi{%
            \ifx\__#2%
                \advance\_ptbcountA by 1\relax%
                \_afterfi{\_mathftable{#1}}%
            \else%
                \_afterfi{\__mathftable{#1}{#2}}%
            \fi%
        }%
    \fi%
}

\def\_mathfonttable#1[#2]#3{%
    \_ptbcountA=#2\relax%
    \_mathftable{#1}#3\_nul%
}

\def\mathfonttable#1{%
    \_ifnextchar[ {\_mathfonttable{#1}}{\_mathfonttable{#1}[0]}%
}

\mathfonttable{4}[0]{%
    \boxdot2\boxplus2\boxtimes2\square0\blacksquare0\__\diamond0\blackdiamond0\rotateclockwise0%
    \rotatecounterclockwise0\rightleftharpoons3\leftrightharpoons3\boxminus2\Vdash3\Vvdash3\vDash3%
    \twoheadrightarrow3\twoheadleftarrow3\leftleftarrows3\rightrightarrows3\upuparrows3%
    \downdownarrows3\uprightharpoon3\downrightharpoon3\upleftharppon3\downleftharpoon3%
    \rightarrowtail3\leftarrowtail3\leftrightarrows3\rightleftarrows3\Lsh3\Rsh3\rightsquigarrow3%
    \leftrightsquigarrow3\looparrowleft3\looparrowright3\circeq3\succsim3\gtrsim3\gtrapprox3%
    \multimap3\therefore2\because2\Doteq3\triangleq3\precsim3\lesssim3\lessapprox3%
}