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%D \module
%D [ file=font-col,
%D version=2008.06.11,
%D title=\CONTEXT\ Font Macros,
%D subtitle=Fallbacks (collections),
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
% ! EXPERIMENTAL ! code will be made more nice
%
% actually we can now do more at the lua end
% todo : missing only, force always, multiple fallbacks with test, scale
% beware : only english key/values
%
% \resetfontfallback [whatever]
%
% \definefontfallback [whatever] [Slanted] [0x0060-0x007F] [force=yes]
% \definefontfallback [whatever] [Bold] [0x0080-0x00FF,0x00A0-0x00AF] [rscale=1.2]
% \definefontfallback [whatever] [BoldSlanted] [0x00C0-0x00C7] [check=yes,force=yes]
\writestatus{loading}{ConTeXt Font Macros / Collections}
\registerctxluafile{font-col}{}
\unprotect
\unexpanded\def\definefontfallback{\doquadrupleempty\font_fallbacks_define}
\unexpanded\def\resetfontfallback {\dodoubleempty \font_fallbacks_reset }
\def\font_fallbacks_define[#name][#font][#ranges][#settings]%
{\let\mathsizesuffix\relax
\clf_fontcollectiondefine{#name}{#font}{#ranges}{#settings}%
\let\mathsizesuffix\empty}
\def\font_fallbacks_reset[#name][#font]%
{\clf_fontcollectionreset{#name}{#font}}
\def\font_fallbacks_prepare#name%
{\clf_fontcollectionprepare{#name}} % add fallbacks to last font
% we might as well move the handling to lua but then we need to pass the
% fallbacks, skewchar etc.
\newconditional\c_font_fallbacks_in_progress
\def\font_fallbacks_prepare_indeed#fallbacks%
{\begingroup
\settrue\c_font_fallbacks_in_progress
\lastrawfontcall % sets current font id
\font_fallbacks_prepare#fallbacks%
\endgroup}
\let\m_font_fallbacks\empty % set in the font-ini
\appendtoks
\ifconditional\c_font_fallbacks_in_progress\else
\ifx\m_font_fallbacks\empty
\ifx\m_font_class_fallbacks\empty
\else
\font_fallbacks_prepare_indeed\m_font_class_fallbacks
\fi
\else
\font_fallbacks_prepare_indeed\m_font_fallbacks
\fi
\fi
\to\everydefinefont
\def\font_fallbacks_start_cloning
{\begingroup
\let\savedfontspec\somefontspec}
\def\font_fallbacks_stop_cloning
{\endgroup}
\def\font_fallbacks_clone_unique#specification#scale% kind of dododefinefont
{\clf_fontcollectionreport{defining #specification (relative scale: #scale)}% brrr
\setfalse\c_font_auto_size
\let\lastfontidentifier\s!dummy
\def\v_font_size_relative{#scale}%
\let\v_font_size_absolute\fontbody
\font_helpers_low_level_define{#specification}\v_font_identifier_basic
\csname\v_font_identifier_basic\endcsname
\setfalse\c_font_auto_size} % no \setfontcharacteristics and \the\everyfontswitch needed
\def\font_fallbacks_clone_inherited#font% also a second argument
{\font_fallbacks_clone_unique{#font \savedfontspec}}
\def\font_fallbacks_register_main #name{\clf_fontcollectionregister{#name}}
\def\font_fallbacks_prepare_clone_vectors#name{\clf_fontcollectionclone{#name}}
% math (experiment, todo clf_)
\def\font_fallbacks_register_math#1#2#3#4%
{\doifelsenothing{#3}%
{\definedfont[#2 at #4sp]}%
{\definedfont[#2*#3\space at #4\scaledpoint]}%
\clf_registerfontfallbackid#1\space\fontid\font\space{#2}}
% \def\font_fallbacks_finish_math
% {\ctxlua{mathematics.finishfallbacks()}}
% check : only replace when present in replacement font (default: no)
% force : force replacent even when basefont has glyph (default: yes)
% \definefontfallback [whatever] [Slanted] [0x0060-0x007F] [force=yes]
% \definefontfallback [whatever] [Bold] [0x0080:0x00FF,0x00A0:0x00AF] [rscale=2.0]
% \definefontfallback [whatever] [BoldSlanted] ["00C0-"00C7] [check=yes,force=yes]
% \definefontfallback [whatever] [Mono] [latinextendeda] [force=yes] % 0x0100:0x017F
% \definefontfallback [whatever] [Mono] [latin extended a] [force=yes] % 0x0100:0x017F
%
% \definefontsynonym[SerifPlus][Serif][fallbacks=whatever]
%
% \showfont[SerifPlus][all]
% \definefontfeature[zh][mode=node,script=hang,lang=zhs]
% \definefontfallback[serifwhatever] [lmroman10-regular] [0x0000-0x0400][force=yes]
% \definefontfallback[serifboldwhatever] [lmroman10-bold] [0x0000-0x0400][force=yes]
% \definefontfallback[serifitalicwhatever] [lmroman10-italic] [0x0000-0x0400][force=yes]
% \definefontfallback[serifbolditalicwhatever][lmroman10-bolditalic][0x0000-0x0400][force=yes]
%
% \starttypescript [serif] [zhfont]
% \definefontsynonym [zhserif] [AdobeSongStd-Light] [features=zh,fallbacks=serifwhatever]
% \definefontsynonym [zhserifbold] [AdobeHeitiStd-Regular][features=zh,fallbacks=serifboldwhatever]
% \definefontsynonym [zhserifitalic] [AdobeKaitiStd-Regular][features=zh,fallbacks=serifitalicwhatever]
% \definefontsynonym [zhserifbolditalic][AdobeHeitiStd-Regular][features=zh,fallbacks=serifbolditalicwhatever]
% \stoptypescript
%
% \starttypescript [serif][zhfont][name]
% \definefontsynonym[Serif] [zhserif] % [fallbacks=serifwhatever]
% \definefontsynonym[SerifBold] [zhserifbold] % [fallbacks=serifboldwhatever]
% \definefontsynonym[SerifItalic] [zhserifitalic] % [fallbacks=serifitalicwhatever]
% \definefontsynonym[SerifBoldItalic] [zhserifbolditalic] % [fallbacks=serifbolditalicwhatever]
% \stoptypescript
%
% \starttypescript[myfont]
% \definetypeface[myfont][rm][serif][zhfont]
% \stoptypescript
%
% \usetypescript[myfont] \setupbodyfont[myfont,rm,12pt]
%
% \starttext
% fonts {\bf fonts} {\bi fonts} {\it fonts}
% \stoptext
\protect \endinput
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