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% \section{Extended font encodings}
%
% \iffalse
%    \begin{macrocode}
%<*fontspec&(xetexx|luatex)>
%    \end{macrocode}
% \fi
%
% To be removed after the 2017 release of LaTeX2e:
%    \begin{macrocode}
\providecommand\UnicodeFontFile[2]{"[#1]:#2"}
\providecommand\UnicodeFontName[2]{"#1:#2"}
%<xetexx>\providecommand\UnicodeFontTeXLigatures{mapping=tex-text;}
%<luatex>\providecommand\UnicodeFontTeXLigatures{+tlig;}
%    \end{macrocode}
%
%    \begin{macrocode}
\providecommand\add@unicode@accent[2]{#2\char#1\relax}
\providecommand\DeclareUnicodeAccent[3]{%
  \DeclareTextCommand{#1}{#2}{\add@unicode@accent{#3}}%
}
%    \end{macrocode}
%
% \begin{macro}{\EncodingCommand}
%    \begin{macrocode}
\DeclareDocumentCommand \EncodingCommand {mO{}m}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \EncodingCommand }
    \DeclareTextCommand{#1}{\UnicodeEncodingName}[#2]{#3}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EncodingAccent}
%    \begin{macrocode}
\DeclareDocumentCommand \EncodingAccent {mm}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \EncodingAccent }
    \DeclareTextCommand{#1}{\UnicodeEncodingName}{\add@unicode@accent{#2}}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EncodingSymbol}
%    \begin{macrocode}
\DeclareDocumentCommand \EncodingSymbol {mm}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \EncodingSymbol }
    \DeclareTextSymbol{#1}{\UnicodeEncodingName}{#2}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EncodingComposite}
%    \begin{macrocode}
\DeclareDocumentCommand \EncodingComposite {mmm}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \EncodingComposite }
    \DeclareTextComposite{#1}{\UnicodeEncodingName}{#2}{#3}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\EncodingCompositeCommand}
%    \begin{macrocode}
\DeclareDocumentCommand \EncodingCompositeCommand {mmm}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \EncodingCompositeCommand }
    \DeclareTextCompositeCommand{#1}{\UnicodeEncodingName}{#2}{#3}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\DeclareUnicodeEncoding}
%    \begin{macrocode}
\DeclareDocumentCommand \DeclareUnicodeEncoding {mm}
  {
    \DeclareFontEncoding{#1}{}{}
    \DeclareErrorFont{#1}{lmr}{m}{n}{10}
    \DeclareFontSubstitution{#1}{lmr}{m}{n}
    \DeclareFontFamily{#1}{lmr}{}

    \DeclareFontShape{#1}{lmr}{m}{n}
      {<->\UnicodeFontFile{lmroman10-regular}{\UnicodeFontTeXLigatures}}{}
    \DeclareFontShape{#1}{lmr}{m}{it}
      {<->\UnicodeFontFile{lmroman10-italic}{\UnicodeFontTeXLigatures}}{}
    \DeclareFontShape{#1}{lmr}{m}{sc}
      {<->\UnicodeFontFile{lmromancaps10-regular}{\UnicodeFontTeXLigatures}}{}
    \DeclareFontShape{#1}{lmr}{bx}{n}
      {<->\UnicodeFontFile{lmroman10-bold}{\UnicodeFontTeXLigatures}}{}
    \DeclareFontShape{#1}{lmr}{bx}{it}
      {<->\UnicodeFontFile{lmroman10-bolditalic}{\UnicodeFontTeXLigatures}}{}

    \tl_set_eq:NN \l_@@_prev_unicode_name_tl \UnicodeEncodingName
    \tl_set:Nn \UnicodeEncodingName {#1}
    \bool_set_true:N \l_@@_defining_encoding_bool
    #2
    \bool_set_false:N \l_@@_defining_encoding_bool
    \tl_set_eq:NN \UnicodeEncodingName \l_@@_prev_unicode_name_tl
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\UndeclareSymbol}
%    \begin{macrocode}
\DeclareDocumentCommand \UndeclareSymbol {m}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \UndeclareSymbol }
    \UndeclareTextCommand {#1} {\UnicodeEncodingName}
  }

%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\UndeclareComposite}
%    \begin{macrocode}
\DeclareDocumentCommand \UndeclareComposite {mm}
  {
    \bool_if:NF \l_@@_defining_encoding_bool
      { \@@_error:nn {only-inside-encdef} \UndeclareComposite }
    \cs_undefine:c
      { \c_backslash_str \UnicodeEncodingName \token_to_str:N #1 - \tl_to_str:n {#2} }
  }
%    \end{macrocode}
% \end{macro}
%
% \iffalse
%    \begin{macrocode}
%</fontspec&(xetexx|luatex)>
%    \end{macrocode}
% \fi