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Diffstat (limited to 'Master/texmf-dist/source/latex/fontspec/fontspec-graphite.dtx')
-rw-r--r-- | Master/texmf-dist/source/latex/fontspec/fontspec-graphite.dtx | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/Master/texmf-dist/source/latex/fontspec/fontspec-graphite.dtx b/Master/texmf-dist/source/latex/fontspec/fontspec-graphite.dtx new file mode 100644 index 00000000000..8015020ad32 --- /dev/null +++ b/Master/texmf-dist/source/latex/fontspec/fontspec-graphite.dtx @@ -0,0 +1,103 @@ +% \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 |