fontspec-code-user.dtx

%%^^A%%  fontspec-code-user.dtx -- part of FONTSPEC <latex3.github.io/fontspec>

% \section{User command internals}
% \label{sec:codeinternal}
%
% \iffalse
%    \begin{macrocode}
%<*fontspec>
%    \end{macrocode}
% \fi
%
%
% \subsection{Font selection}
%
% \begin{macro}{\@@_main_fontspec:nn}
%   This is the main command of the package that
%   selects fonts with various features. It takes two arguments: the
%   font name and the optional requested features of that
%   font.
%    \begin{macrocode}
\cs_new:Nn \@@_main_fontspec:nn
  {
    \fontspec_set_family:Nnn \f@family {#1} {#2}
    \fontencoding { \g_@@_nfss_enc_tl }
    \selectfont
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\rmfamily}
% \begin{macro}{\sffamily}
% \begin{macro}{\ttfamily}
% Add an encoding switch to the three family commands.
%    \begin{macrocode}
\cs_if_exist:NTF \@rmfamilyhook
  {
    \tl_put_right:Nn \@rmfamilyhook {\fontencoding \l_@@_rmfamily_encoding_tl}
    \tl_put_right:Nn \@sffamilyhook {\fontencoding \l_@@_sffamily_encoding_tl}
    \tl_put_right:Nn \@ttfamilyhook {\fontencoding \l_@@_ttfamily_encoding_tl}
  }
  {
    \tl_replace_all:cnn { rmfamily~ } { \fontfamily }
      { \fontencoding \l_@@_rmfamily_encoding_tl \fontfamily }
    \tl_replace_all:cnn { sffamily~ } { \fontfamily }
      { \fontencoding \l_@@_sffamily_encoding_tl \fontfamily }
    \tl_replace_all:cnn { ttfamily~ } { \fontfamily }
      { \fontencoding \l_@@_ttfamily_encoding_tl \fontfamily }
  }
\tl_set:Nn \l_@@_rmfamily_encoding_tl { \encodingdefault }
\tl_set:Nn \l_@@_sffamily_encoding_tl { \encodingdefault }
\tl_set:Nn \l_@@_ttfamily_encoding_tl { \encodingdefault }
%    \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\setmainfont}
%     The following three macros perform equivalent operations setting
%     the default font for a particular family: `roman', sans serif, or typewriter
%     (monospaced).
%
%     They end with |\normalfont| so that if they're
%     used in the document, the change registers immediately.
%    \begin{macrocode}
\cs_new:Nn \@@_main_setmainfont:nn
  {
%<debug>\typeout{::~_main_setmainfont:nn}
    \ifdefined\DeclareFontSeriesDefault
      \DeclareFontSeriesDefault[rm]{bf}{\bfdefault}
    \fi
    \fontspec_set_family:Nnn \l_@@_rmfamily_family_tl {#1} {#2}
    \tl_set_eq:NN \rmdefault \l_@@_rmfamily_family_tl
    \tl_set_eq:NN \l_@@_rmfamily_encoding_tl \g_@@_nfss_enc_tl
    \str_if_eq:eeT {\familydefault} {\rmdefault}
      { \tl_set_eq:NN \encodingdefault \g_@@_nfss_enc_tl }
    \@@_setmainfont_hook:nn {#1} {#2} % for unicode-math only
    \normalfont
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setsansfont}
% Same as above.
%    \begin{macrocode}
\cs_new:Nn \@@_main_setsansfont:nn
  {
    \ifdefined\DeclareFontSeriesDefault
      \DeclareFontSeriesDefault[sf]{bf}{\bfdefault}
    \fi
    \fontspec_set_family:Nnn \l_@@_sffamily_family_tl {#1} {#2}
    \tl_set_eq:NN \sfdefault \l_@@_sffamily_family_tl
    \tl_set_eq:NN \l_@@_sffamily_encoding_tl \g_@@_nfss_enc_tl
    \str_if_eq:eeT {\familydefault} {\sfdefault}
      { \tl_set_eq:NN \encodingdefault \g_@@_nfss_enc_tl }
    \@@_setsansfont_hook:nn {#1} {#2} % for unicode-math only
    \normalfont
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setmonofont}
% Same as above.
%    \begin{macrocode}
\cs_new:Nn \@@_main_setmonofont:nn
  {
    \ifdefined\DeclareFontSeriesDefault
      \DeclareFontSeriesDefault[tt]{bf}{\bfdefault}
    \fi
    \fontspec_set_family:Nnn \l_@@_ttfamily_family_tl {#1} {#2}
    \tl_set_eq:NN \ttdefault \l_@@_ttfamily_family_tl
    \tl_set_eq:NN \l_@@_ttfamily_encoding_tl \g_@@_nfss_enc_tl
    \str_if_eq:eeT {\familydefault} {\ttdefault}
      { \tl_set_eq:NN \encodingdefault \g_@@_nfss_enc_tl }
    \@@_setmonofont_hook:nn {#1} {#2} % for unicode-math only
    \normalfont
  }
%    \end{macrocode}
% \end{macro}
%
%
%
%
% \begin{macro}{\setmathrm}
% These commands are analogous to \cmd\setmainfont\ and others,
% but for selecting the font used for \cmd\mathrm, \etc. They
% can only be used in the preamble of the
% document. \cmd\setboldmathrm\ is used for specifying which
% fonts should be used in \cmd\boldmath.
%    \begin{macrocode}
\cs_new:Nn \@@_main_setmathrm:nn
  {
%<XE> \fontspec_gset_family:Nnn \g_@@_mathrm_tl {#1} {#2}
%<LU> \fontspec_gset_family:Nnn \g_@@_mathrm_tl {Renderer=Basic,#1} {#2}
    \@@_setmathrm_hook:nn {#1} {#2} % for unicode-math only
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setboldmathrm}
%    \begin{macrocode}
\cs_new:Nn \@@_main_setboldmathrm:nn
  {
%<XE> \fontspec_gset_family:Nnn \g_@@_bfmathrm_tl {#1} {#2}
%<LU> \fontspec_gset_family:Nnn \g_@@_bfmathrm_tl {Renderer=Basic,#1} {#2}
    \@@_setboldmathrm_hook:nn {#1} {#2} % for unicode-math only
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setmathsf}
%    \begin{macrocode}
\cs_new:Nn \@@_main_setmathsf:nn
  {
%<XE> \fontspec_gset_family:Nnn \g_@@_mathsf_tl {#1} {#2}
%<LU> \fontspec_gset_family:Nnn \g_@@_mathsf_tl {Renderer=Basic,#1} {#2}
    \@@_setmathsf_hook:nn {#1} {#2} % for unicode-math only
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\setmathtt}
%    \begin{macrocode}
\cs_new:Nn \@@_main_setmathtt:nn
  {
%<XE> \fontspec_gset_family:Nnn \g_@@_mathtt_tl {#1} {#2}
%<LU> \fontspec_gset_family:Nnn \g_@@_mathtt_tl {Renderer=Basic,#1} {#2}
    \@@_setmathtt_hook:nn {#1} {#2} % for unicode-math only
  }
%    \end{macrocode}
% \end{macro}
%
% Hooks:
%    \begin{macrocode}
\cs_set_eq:NN \@@_setmainfont_hook:nn   \use_none:nn
\cs_set_eq:NN \@@_setsansfont_hook:nn   \use_none:nn
\cs_set_eq:NN \@@_setmonofont_hook:nn   \use_none:nn
\cs_set_eq:NN \@@_setmathrm_hook:nn     \use_none:nn
\cs_set_eq:NN \@@_setmathsf_hook:nn     \use_none:nn
\cs_set_eq:NN \@@_setmathtt_hook:nn     \use_none:nn
\cs_set_eq:NN \@@_setboldmathrm_hook:nn \use_none:nn
%    \end{macrocode}
%
% Hmm, this isn't necessary with \pkg{unicode-math}; oh well:
%    \begin{macrocode}
\@onlypreamble\setmathrm
\@onlypreamble\setboldmathrm
\@onlypreamble\setmathsf
\@onlypreamble\setmathtt
%    \end{macrocode}
%
% If the commands above are not executed, then \cmd\rmdefault\ (\etc)
% will be used.
%    \begin{macrocode}
\tl_gset:Nn \g_@@_mathrm_tl {\rmdefault}
\tl_gset:Nn \g_@@_mathsf_tl {\sfdefault}
\tl_gset:Nn \g_@@_mathtt_tl {\ttdefault}
%    \end{macrocode}
%
% \begin{macro}{\@@_main_newfontfamily:NnnN}
%   The inner fontspec workings define a font family, which is then used in a typical
%   NFSS \cmd\fontfamily\ declaration, saved in the macro name specified.
%   The fourth argument determines which xparse function to set the macro with (new/renew/etc).
%    \begin{macrocode}
\cs_new:Nn \@@_main_newfontfamily:NnnN
  {
    \fontspec_set_family:cnn { l_@@_ \cs_to_str:N #1 _family_tl } {#2} {#3}
    \use:x
      {
        \exp_not:N #4 \exp_not:N #1 {}
          {
            \exp_not:N \fontfamily { \use:c { l_@@_ \cs_to_str:N #1 _family_tl } }
            \exp_not:N \fontencoding { \g_@@_nfss_enc_tl }
            \exp_not:N \selectfont
          }
      }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_main_newfontface:NnnN}
% \cmd\newfontface\ uses the fact that if the argument to \feat{BoldFont}, etc., is empty (\ie, |BoldFont={}|), then no bold font is searched for.
%    \begin{macrocode}
\cs_new:Nn \@@_main_newfontface:NnnN
  {
    \@@_main_newfontfamily:NnnN #1 { BoldFont={},ItalicFont={},SmallCapsFont={},#2 } {#3} #4
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Font feature selection}
%
% \begin{macro}{\@@_set_default_features:nn}
%    \begin{macrocode}
\cs_new:Nn \@@_set_default_features:nn
  {
    \IfBooleanTF {#1} \clist_gput_right:Nn \clist_gset:Nn
      \g_@@_default_fontopts_clist {#2}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_set_font_default_features:nnn}
% The optional argument |#2| specifies font identifier(s).
% Branch for either (a)~single token input such as \verb|\rmdefault|, or (b)~otherwise assume its a fontname.
% In that case, strip spaces and file extensions and lower-case to ensure consistency.
%    \begin{macrocode}
\cs_new:Nn \@@_set_font_default_features:nnn
  {
%<debug> \typeout{\unexpanded{_set_font_default_features:nnn:{#1}{#2}{#3}}}
    \clist_map_inline:nn {#2}
      {
        \tl_if_single:nTF {##1}
          { \tl_set:No \l_@@_tmp_tl { \cs:w l_@@_ \cs_to_str:N ##1 _family_tl\cs_end: } }
          { \@@_sanitise_fontname:Nn \l_@@_tmp_tl {##1} }

        \IfBooleanTF {#1}
          {
            \prop_get:NVNF \g_@@_fontopts_prop \l_@@_tmp_tl \l_@@_tmpb_tl
              { \tl_clear:N \l_@@_tmpb_tl }
            \tl_put_right:Nn \l_@@_tmpb_tl {#3,}
            \prop_gput:NVV   \g_@@_fontopts_prop \l_@@_tmp_tl \l_@@_tmpb_tl
          }
          {
            \tl_if_empty:nTF {#3}
              { \prop_gremove:NV \g_@@_fontopts_prop \l_@@_tmp_tl }
              { \prop_gput:NVn    \g_@@_fontopts_prop \l_@@_tmp_tl {#3,} }
          }
      }
  }
%    \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\addfontfeatures}
%   In order to be able to extend the feature selection of
%   a given font, two things need to be known: the currently selected
%   features, and the currently selected font. Every time a font
%   family is created, this information is saved inside a control
%   sequence with the name of the font family itself.
%
%   This macro extracts this information, then appends the requested
%   font features to add to the already existing ones, and calls the
%   font again with the top level \cs{fontspec} command.
%
%   The default options are \emph{not} applied (which is why
%   \cs{g_fontspec_default_fontopts_tl} is emptied inside the group; this is allowed
%   as \cmd\l_fontspec_family_tl\ is globally defined in \cmd\@@_select_font_family:nn), so this
%   means that the only added features to the font are strictly those
%   specified by this command.
%
%   \cs{addfontfeature} is defined as an alias, as I found that I
%   often typed this instead when adding only a single font feature.
%    \begin{macrocode}
\cs_new:Nn \@@_main_addfontfeatures:n
  {
%<debug> \typeout{^^J::::::::::::::::::::::::::::::::::^^J: addfontfeatures}
    \fontspec_if_fontspec_font:TF
      {
        \group_begin:
          \keys_set_known:nnN {fontspec-addfeatures} {#1} \l_@@_tmp_tl
          \prop_get:cnN {g_@@_fontinfo_ \f@family _prop} {options}  \l_@@_options_tl
          \prop_get:cnN {g_@@_fontinfo_ \f@family _prop} {fontname} \l_@@_fontname_tl
          \bool_set_true:N \l_@@_disable_defaults_bool
%<debug> \typeout{ \@@_select_font_family:nn { \l_@@_options_tl , #1 } {\l_@@_fontname_tl} }
          \use:x
            {
              \@@_select_font_family:nn
                { \l_@@_options_tl , #1 } {\l_@@_fontname_tl}
            }
        \group_end:
        \fontfamily \g_@@_nfss_family_tl \selectfont
      }
      {
        \@@_warning:nx {addfontfeatures-ignored} {#1}
      }
    \ignorespaces
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Defining new font features}
%
% \begin{macro}{\newfontfeature}
%   \cs{newfontfeature} takes two arguments: the name of the feature
%   tag by which to reference it, and the string that is used to
%   select the font feature.
%    \begin{macrocode}
\cs_new:Nn \@@_main_newfontfeature:nn
  {
    \keys_define:nn { fontspec }
      {
        #1 .code:n = { \@@_update_featstr:n {#2} }
      }
  }
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\newAATfeature}
% This command assigns a new AAT feature by its code (|#2|,|#3|) to a new name (|#1|).
% Better than \cmd\newfontfeature\ because it checks if the feature exists in the
% font it's being used for.
%    \begin{macrocode}
\cs_new:Nn \@@_main_newAATfeature:nnnn
  {
    \keys_if_exist:nnF { fontspec } {#1}
      { \@@_define_aat_feature_group:n {#1} }

    \keys_if_choice_exist:nnnT {fontspec} {#1} {#2}
      { \@@_warning:nxx {feature-option-overwrite} {#1} {#2} }

    \@@_define_aat_feature:nnnn {#1}{#2}{#3}{#4}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\newopentypefeature}
% This command assigns a new OpenType feature by its abbreviation (|#2|) to a new name (|#1|).
% Better than \cmd\newfontfeature\ because it checks if the feature exists in the
% font it's being used for.
%    \begin{macrocode}
\cs_new:Nn \@@_main_newopentypefeature:nnn
  {
    \keys_if_exist:nnF { fontspec / options } {#1}
      { \@@_define_opentype_feature_group:n {#1} }

    \keys_if_choice_exist:nnnT {fontspec} {#1} {#2}
      { \@@_warning:nxx {feature-option-overwrite} {#1} {#2} }

    \exp_args:Nnnx \@@_define_opentype_feature:nnnnn
      {#1} {#2} { \@@_strip_plus_minus:n {#3} } {#3} {}
  }
%    \end{macrocode}
%
%    \begin{macrocode}
\cs_new:Nn \@@_strip_plus_minus:n { \@@_strip_plus_minus_aux:Nq #1 \q_nil }
\cs_new:Npn \@@_strip_plus_minus_aux:Nq #1#2 \q_nil
  {
    \str_case:nnF {#1} { {+} {#2} {-} {#2} } {#1#2}
  }
%    \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\aliasfontfeature}
% User commands for renaming font features and font feature options.
%    \begin{macrocode}
\cs_new:Nn \@@_main_aliasfontfeature:nn
  {
%<debug> \typeout{::::::::::::::::::::^^J:: aliasfontfeature{#1}{#2}}
    \bool_set_false:N \l_@@_alias_bool

    \clist_map_inline:Nn \g_@@_all_keyval_modules_clist
      {
        \keys_if_exist:nnT {##1} {#1}
          {
%<debug> \typeout{:::: Key~exists~##1~/~#1}
            \bool_set_true:N \l_@@_alias_bool
            \keys_define:nn {##1}
              { #2 .code:n = { \keys_set:nn {##1} { #1 = {####1} } } }
          }
      }

    \bool_if:NF \l_@@_alias_bool
      { \@@_warning:nx {rename-feature-not-exist} {#1} }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\aliasfontfeatureoption}
%    \begin{macrocode}
\cs_new:Nn \@@_main_aliasfontfeatureoption:nnn
  {
    \bool_set_false:N \l_@@_alias_bool

    \clist_map_inline:Nn \g_@@_all_keyval_modules_clist
      {
        \keys_if_exist:nnT { ##1 / #1 } {#2}
          {
%<debug> \typeout{:::: Keyval~exists~##1~/~#1~=~#2}
            \bool_set_true:N \l_@@_alias_bool
            \keys_define:nn { ##1 / #1 }
              { #3 .code:n = { \keys_set:nn {##1} { #1 = {#2} } } }
          }

       \keys_if_exist:nnT { ##1 / #1 } {#2Reset}
         {
%<debug> \typeout{:::: Keyval~exists~##1~/~#1~=~#2Reset}
            \keys_define:nn { ##1 / #1 }
              { #3Reset .code:n = { \keys_set:nn {##1} { #1 = {#2Reset} } } }
         }

       \keys_if_exist:nnT { ##1 / #1 } {#2Off}
         {
%<debug> \typeout{:::: Keyval~exists~##1~/~#1~=~#2Off}
            \keys_define:nn { ##1 / #1 }
              { #3Off .code:n = { \keys_set:nn {##1} { #1 = {#2Off} } } }
         }
     }

    \bool_if:NF \l_@@_alias_bool
      { \@@_warning:nx {rename-feature-not-exist} {#1/#2} }
  }
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\@@_main_DeclareFontExtensions:n}
%    \begin{macrocode}
\cs_new:Nn \@@_main_DeclareFontExtensions:n
  {
    \clist_set:Nn \l_@@_extensions_clist { #1 }
  }
%    \end{macrocode}
% Defaults:
%    \begin{macrocode}
\@@_main_DeclareFontExtensions:n {.otf,.ttf,.OTF,.TTF,.ttc,.TTC,.dfont}
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{High level conditionals}
%
%
% \begin{macro}{\IfFontFeatureActiveTF}
%    \begin{macrocode}
\cs_new:Nn \@@_main_IfFontFeatureActiveTF:nnn
  {
%<debug> \typeout{^^J:::::::::::::::::::::::::::::::::::::::::::::::}
%<debug> \typeout{:IfFontFeatureActiveTF \exp_not:n{{#1}{#2}{#3}}}
    \@@_if_font_feature:nTF {#1} {#2} {#3}
  }
%    \end{macrocode}
%
%    \begin{macrocode}
\prg_new_conditional:Nnn \@@_if_font_feature:n {TF}
  {
    \tl_gclear:N \g_@@_single_feat_tl
    \group_begin:
      \@@_font_suppress_not_found_error:
      \@@_init:
      \bool_set_true:N \l_@@_ot_bool
      \bool_set_true:N \l_@@_never_check_bool
      \bool_set_false:N \l_@@_firsttime_bool
      \clist_clear:N \l_@@_fontfeat_clist
      \@@_get_features:n {#1}
    \group_end:

%<debug> \typeout{:::> \exp_not:N\g_@@_rawfeatures_sclist->~{\g_@@_rawfeatures_sclist}}
%<debug> \typeout{:::> \exp_not:N\g_@@_single_feat_tl->~{\g_@@_single_feat_tl}}

    \tl_if_empty:NTF \g_@@_single_feat_tl { \prg_return_false: }
      {
        \exp_args:NV \fontspec_if_current_feature:nTF \g_@@_single_feat_tl
          { \prg_return_true: } { \prg_return_false: }
      }
  }
%    \end{macrocode}
% \end{macro}
%
%
% \subsection{\cs{oldstylenums} and \cs{liningnums}}
%
% \begin{macro}{\oldstylenums}
% \begin{macro}{\liningnums}
% This command needs a redefinition.
% And we may as well provide the reverse command.
%    \begin{macrocode}
\cs_new_protected:Nn \@@_main_oldstylenums:n
  {
    \group_begin:
      \addfontfeature{Numbers=OldStyle}
      #1
    \group_end:
  }
\cs_new_protected:Nn \@@_main_liningnums:n
  {
    \group_begin:
      \addfontfeature{Numbers=Lining}
      #1
    \group_end:
  }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%
%
% \iffalse
%    \begin{macrocode}
%</fontspec>
%    \end{macrocode}
% \fi


\endinput

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