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% \section{expl3 interface for primitive font loading}
%
% \iffalse
%    \begin{macrocode}
%<*fontspec&(xetexx|luatex)>
%    \end{macrocode}
% \fi
%
% \begin{macro}{\@@_primitive_font_set:Nnn,\@@_primitive_font_gset:Nnn}
%    \begin{macrocode}
\cs_set:Npn \@@_primitive_font_set:Nnn #1#2#3
  {
    \font #1 = #2 ~at~ #3 \scan_stop:
  }
%    \end{macrocode}
%    \begin{macrocode}
\cs_set:Npn \@@_primitive_font_gset:Nnn #1#2#3
  {
    \global \font #1 = #2 ~at~ #3 \scan_stop:
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_font_suppress_not_found_error:}
%    \begin{macrocode}
\cs_set:Npn \@@_font_suppress_not_found_error:
  {
    \int_set_eq:NN \xetex_suppressfontnotfounderror:D \c_one
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[pTF]{\@@_primitive_font_if_null:N}
%    \begin{macrocode}
\prg_set_conditional:Nnn \@@_primitive_font_if_null:N {p,TF,T,F}
  {
    \ifx #1 \nullfont
      \prg_return_true:
    \else
      \prg_return_false:
    \fi
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[TF]{\@@_primitive_font_if_exist:n}
%    \begin{macrocode}
\prg_set_conditional:Nnn \@@_primitive_font_if_exist:n {TF,T,F}
  {
    \group_begin:
      \@@_font_suppress_not_found_error:
      \@@_primitive_font_set:Nnn \l_@@_primitive_font {#1} {10pt}
      \@@_primitive_font_if_null:NTF \l_@@_primitive_font
        { \group_end: \prg_return_false: }
        { \group_end: \prg_return_true:  }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_primitive_font_glyph_if_exist:NnTF}
%    \begin{macrocode}
\prg_new_conditional:Nnn \@@_primitive_font_glyph_if_exist:Nn {p,TF,T,F}
  {
    \etex_iffontchar:D #1 #2 \scan_stop:
      \prg_return_true:
    \else:
      \prg_return_false:
    \fi:
  }
%    \end{macrocode}
% \end{macro}
%
% \iffalse
%    \begin{macrocode}
%</fontspec&(xetexx|luatex)>
%    \end{macrocode}
% \fi