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%%^^A%% fontspec-graphite.dtx -- part of FONTSPEC <wspr.io/fontspec>
% \section{Graphite/AAT code}
%
% \iffalse
% \begin{macrocode}
%<*fontspec&XE>
% \end{macrocode}
% \fi
%
% \begin{macro}{\@@_define_aat_feature_group:n}
% \begin{macrocode}
\cs_new:Nn \@@_define_aat_feature_group:n
{ \keys_define:nn {fontspec-aat} { #1 .multichoice: } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_define_aat_feature:nnnn}
% \begin{macrocode}
\cs_new:Nn \@@_define_aat_feature:nnnn
{
\keys_define:nn {fontspec-aat}
{
#1/#2 .code:n = { \@@_make_AAT_feature:nn {#3}{#4} }
}
}
% \end{macrocode}
% \end{macro}
% \begin{macro}{\@@_make_AAT_feature:nn}
% \begin{macrocode}
\cs_new:Nn \@@_make_AAT_feature:nn
{
\tl_if_empty:nTF {#1}
{ \@@_warning:n {aat-feature-not-exist} }
{
\@@_make_AAT_feature_string:NnnTF \l_fontspec_font {#1}{#2}
{
\@@_update_featstr:n {\l_fontspec_feature_string_tl}
}
{ \@@_warning:nx {aat-feature-not-exist-in-font} {#1,#2} }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_make_AAT_feature_string:NnnTF}
% This macro takes the numerical codes for a font feature and
% creates a specified macro containing the string required in the
% font definition to turn that feature on or off. Used primarily in
% [...], but also used to check if small caps
% exists in the requested font (see page~\pageref{mac:makesmallcaps}).
%
% For exclusive selectors, it's easy; just grab the string:
% For \emph{non}-exclusive selectors, it's a little more complex.
% If the selector is even, it corresponds to switching the feature on.
% If the selector is \emph{odd}, it corresponds to switching the feature off.
% But \XeTeX\ doesn't return a selector string for this number, since the
% feature is defined for the `switching on' value. So we need to check the
% selector of the previous number, and then prefix the feature string with |!|
% to denote the switch.
%
% Finally, save out the complete feature string in \cmd\l_fontspec_feature_string_tl.
% \begin{macrocode}
\prg_new_conditional:Nnn \@@_make_AAT_feature_string:Nnn {TF,T,F}
{
\tl_set:Nx \l_tmpa_tl { \XeTeXfeaturename #1 #2 }
\tl_if_empty:NTF \l_tmpa_tl
{ \prg_return_false: }
{
\int_compare:nTF { \XeTeXisexclusivefeature #1 #2 > 0 }
{
\tl_set:Nx \l_tmpb_tl {\XeTeXselectorname #1 #2\space #3}
}
{
\int_if_even:nTF {#3}
{
\tl_set:Nx \l_tmpb_tl {\XeTeXselectorname #1 #2\space #3}
}
{
\tl_set:Nx \l_tmpb_tl
{
\XeTeXselectorname #1 #2\space \numexpr#3-1\relax
}
\tl_if_empty:NF \l_tmpb_tl { \tl_put_left:Nn \l_tmpb_tl {!} }
}
}
\tl_if_empty:NTF \l_tmpb_tl
{ \prg_return_false: }
{
\tl_set:Nx \l_fontspec_feature_string_tl { \l_tmpa_tl = \l_tmpb_tl }
\prg_return_true:
}
}
}
% \end{macrocode}
% \end{macro}
%
% \iffalse
% \begin{macrocode}
%</fontspec&XE>
% \end{macrocode}
% \fi
\endinput
% /©
% ------------------------------------------------
% The FONTSPEC package <wspr.io/fontspec>
% ------------------------------------------------
% Copyright 2004-2018 Will Robertson, LPPL "maintainer"
% Copyright 2009-2015 Khaled Hosny
% Copyright 2013 Philipp Gesang
% Copyright 2013-2016 Joseph Wright
% ------------------------------------------------
% This package is free software and may be redistributed and/or modified under
% the conditions of the LaTeX Project Public License, version 1.3c or higher
% (your choice): <http://www.latex-project.org/lppl/>.
% ------------------------------------------------
% ©/
|
