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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \loadmath {Unicode Math fonts <2020-02-25>} % preloaded in format
\_newifi \_ifmathloading \_mathloadingtrue
\_def\_noloadmath{\_mathloadingfalse}
\_def\_doloadmath{\_mathloadingtrue}
\_def\_loadmath#1{%
\_ifmathloading
\_initunifonts
\_isfont{#1}\_iffalse
\_opwarning{Math font "#1" not found, skipped...}%
\_else
\_def\_unimathfont{#1}%
\_let\_normalmath = \_normalunimath \_let\_boldmath = \_boldunimath
\_normalmath
\_wterm {MATH-FONT: "#1" -- unicode math prepared.}%
\_setctable\_optexcatcodes \_input unimath-codes.opm \_restorectable
\_mathloadingfalse
\_fi\_fi}
\_def\_loadboldmath#1#2\to #3{%
\_def\_tmp{#3}\_ifx\_unimathfont\_tmp % do work only if #3 is loaded as normal Math
\_isfont"#1"\_iffalse
\_opwarning{Bold-Math font "#1" not found, skipped...}
\_else
\_def\_unimathboldfont{#1}%
\_wterm {MATH-FONT: "#1" -- unicode math bold prepared.}%
\_fi\_fi}
\_def\_normalunimath{%
\_loadumathfamily 1 {\_unimathfont}{} % Base font
\_loadmathfamily 4 rsfs % script
\_setmathdimens
}%
\_def\_boldunimath{%
\_ifx\_unimathboldfont \_undefined
\_loadumathfamily 1 {\_unimathfont}{embolden=1.7;} % Base faked bold
\_else
\_loadumathfamily 1 {\_unimathboldfont}{} % Base real bold font
\_fi
\_loadmathfamily 4 rsfs % script
\_setmathdimens
}%
\_def\_umathname#1#2{"#1:\_mfontfeatures#2"}
\_def\_mfontfeatures{mode=base;script=math;}
\_def\_loadumathfamily #1 #2#3 {%
\_edef\_optsizesave{\_the\_optsize}%
\_optsize=\_sizemtext \_font\_mF=\_umathname{#2}{#3} at\_optsize \_textfont#1=\_mF
\_ifnum#1=1 \_textfont2=\_mF \_textfont3=\_mF \_fi
\_optsize=\_sizemscript \_font\_mF=\_umathname{#2}{+ssty=0;#3} at\_optsize \_scriptfont#1=\_mF
\_ifnum#1=1 \_scriptfont2=\_mF \_scriptfont3=\_mF \_fi
\_optsize=\_sizemsscript \_font\_mF=\_umathname{#2}{+ssty=1;#3} at\_optsize \_scriptscriptfont#1=\_mF
\_ifnum#1=1 \_scriptscriptfont2=\_mF \_scriptscriptfont3=\_mF \_fi
\_optsize=\_optsizesave \_relax
}
\_newcount\_umathnumA \_newcount\_umathnumB
\_def\_umathcorr#1#2{\_ea#1\_ea{\_the#2}}
\_def\_umathprepare#1{\_def\_umathscanholes##1[#1]##2##3\_relax{##2}}
\_def\_umathvalue#1{\_ea\_umathscanholes\_umathcharholes[#1]{#1}\_relax}
\_def\_umathcharholes{% holes in math alphabets:
[119893]{"210E}[119965]{"212C}[119968]{"2130}[119969]{"2131}%
[119971]{"210B}[119972]{"2110}[119975]{"2112}[119976]{"2133}[119981]{"211B}%
[119994]{"212F}[119996]{"210A}[120004]{"2134}%
[120070]{"212D}[120075]{"210C}[120076]{"2111}[120085]{"211C}[120093]{"2128}%
[120122]{"2102}[120127]{"210D}[120133]{"2115}[120135]{"2119}
[120136]{"211A}[120137]{"211D}[120145]{"2124}%
}
\_def\_umathrange#1#2{\_umathnumB=#2\_relax \_umathrangeA#1}
\_def\_umathrangeA#1-#2{\_umathnumA=`#1\_relax
\_loop
\_umathcorr\_umathprepare\_umathnumB
\_Umathcode \_umathnumA = 7 1 \_umathcorr\_umathvalue{\_umathnumB}
\_ifnum\_umathnumA<`#2\_relax
\_advance\_umathnumA by1 \_advance\_umathnumB by1
\_repeat
}
\_def\_umathrangeGREEK{\_begingroup
\_lccode`A="0391 \_lccode`Z="03A9
\_lowercase{\_endgroup \_umathrange{A-Z}}}
\_def\_umathrangegreek{\_begingroup
\_lccode`A="03B1 \_lccode`Z="03D6
\_lowercase{\_endgroup \_umathrange{A-Z}}}
\_def\_greekdef#1{\_ifx#1\_relax \_else
\_begingroup \_lccode`X=\_umathnumB \_lowercase{\_endgroup \_def#1{X}}%
\_advance\_umathnumB by 1
\_expandafter\_greekdef \_fi
}
\_public
\loadmath \loadboldmath \noloadmath \doloadmath ;
\_endcode
--------------------------------------------
The `\loadmath` macro loads math fonts and sets math-codes using \input
unimath-codes.opm. If UnicodeMath font is loaded then `\_mathloadingfalse`
is set, so new UnicodeMath font isn't loaded until `\domathload` is used.
`\loadadboldmath{<bold-font>} \to {<normal-font>}` loads bold variant only
if <normal-font> was sucessully loaded. For example:
\begtt
\loadmath {[xitsmath-regular]}
\loadboldmath {[xitsmath-bold]} \to {[xitsmath-regular]}
\endtt
You can combine more fonts, if you register them to another
math families (5, 6, 7, etc.) in \normalmath macro.
The default value of \normalmath shows a combination of base Unicode Math
font with 8bit Math font at family 4. See definition of \script macro where
\fam4 is used. Of course, we need to set \rmvariables too, because 8bit font
accepts only codes less than 255.
See http://tex.stackexchange.com/questions/308749/ for more technical details.
--------------------
\loadmath{[XITSMath-Regular]} ... XITS MATH^^J
\loadmath{[latinmodern-math]} ... Latin Modern Math^^J
\loadmath{[texgyretermes-math]} ... TeXGyre Termes Math^^J
\loadmath{[texgyrebonum-math]} ... TeXGyre Bonum Math^^J
\loadmath{[texgyrepagella-math]} ... TeXGyre Pagella Math^^J
\loadmath{[texgyreschola-math]} ... TeXGyre Schola Math^^J
\loadmath{[texgyredejavu-math]} ... TeXGyre DeJaVu Math^^J
\loadmath{[LibertinusMath-Regular]} ... Libertinus Math^^J
\loadmath{[FiraMath-Regular]} ... Fira Math^^J
\loadmath{[Asana-Math]} ... Asana Math^^J
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