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+% \section{Graphite/AAT code}
+%
+% \iffalse
+% \begin{macrocode}
+%<*fontspec&xetexx>
+% \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:nnTF {#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:nnTF}
+% 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:nn {TF,T,F}
+ {
+ \tl_set:Nx \l_tmpa_tl { \XeTeXfeaturename \l_fontspec_font #1 }
+ \tl_if_empty:NTF \l_tmpa_tl
+ { \prg_return_false: }
+ {
+ \int_compare:nTF { \XeTeXisexclusivefeature\l_fontspec_font #1 > 0 }
+ {
+ \tl_set:Nx \l_tmpb_tl {\XeTeXselectorname\l_fontspec_font #1\space #2}
+ }
+ {
+ \int_if_even:nTF {#2}
+ {
+ \tl_set:Nx \l_tmpb_tl {\XeTeXselectorname\l_fontspec_font #1\space #2}
+ }
+ {
+ \tl_set:Nx \l_tmpb_tl
+ {
+ \XeTeXselectorname\l_fontspec_font #1\space \numexpr#2-1\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&xetexx>
+% \end{macrocode}
+% \fi