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% \section{expl3 interface for font loading}
%
% \iffalse
%    \begin{macrocode}
%<*fontspec&(xetexx|luatex)>
%    \end{macrocode}
% \fi
%
%    \begin{macrocode}
\cs_set:Nn \@@_fontwrap:n { "#1" }
%    \end{macrocode}
%
%    \begin{macrocode}
\cs_set:Npn \@@_primitive_font_set:Nnn #1#2#3
  {
    \font #1 = #2 ~at~ #3 \scan_stop:
  }

\cs_set:Npn \@@_primitive_font_gset:Nnn #1#2#3
  {
    \global \font #1 = #2 ~at~ #3 \scan_stop:
  }

\cs_set:Npn \@@_font_suppress_not_found_error:
  {
    \int_set_eq:NN \xetex_suppressfontnotfounderror:D \c_one
  }

\prg_set_conditional:Nnn \@@_font_if_null:N {p,TF,T,F}
  {
    \ifx #1 \nullfont
      \prg_return_true:
    \else
      \prg_return_false:
    \fi
  }
%    \end{macrocode}
%
%
% \begin{macro}{\fontspec_set:Nnn,\fontspec_gset:Nnn}
% Wrapper around \cs{font_set:Nnn} and \cs{font_gset:Nnn}.
%    \begin{macrocode}
\cs_new:Nn \@@_font_set:Nnn
 {
  \@@_primitive_font_set:Nnn  #1 { \@@_fontwrap:n {#2} } {#3}
 }
\cs_new:Nn \@@_font_gset:Nnn
 {
  \@@_primitive_font_gset:Nnn #1 { \@@_fontwrap:n {#2} } {#3}
 }
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\font_glyph_if_exist:NnTF}
%    \begin{macrocode}
\prg_new_conditional:Nnn \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