%
% luatexja-fontspec.sty
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{luatexja-fontspec}[2011/09/23 v0.2]

\RequirePackage{fontspec,luatexja}

\ExplSyntaxOn

\cs_new:Npn \ltj_fontspec_warning:n   { \msg_warning:nn   {ltj-fontspec} }

\msg_new:nnn {ltj-fontspec} {addjfontfeatures-ignored}
{
  \string\addjfontfeature (s)~ ignored;\\
  it~ cannot~ be~ used~ with~ a~ font~ that~ wasn't~ selected~ by~ luatexja-fontspec.
}

\cs_generate_variant:Nn \prg_new_conditional:Nnn {Nnx}

\prg_new_conditional:Nnx \ltj_fontspec_if_liiikeys: {TF,F} {
  \@ifpackagelater {fontspec} {2011/09/13}
  { \exp_not:N \prg_return_true: }  % fontspec >= 2.2 (l3keys)
  { \exp_not:N \prg_return_false: } % fontspec <  2.2 (xkeyval)
}

\cs_new:Nn \ltj_fontspec_define_option:nn {
  \ltj_fontspec_if_liiikeys:TF {
    \keys_define:nn {fontspec} { #1 .code:n = {#2}}
  } {
    \define@key[zf]{options}{#1}{#2}
  }
}

\cs_new:Nn \ltj_fontspec_define_preparse_external:nn {
  \ltj_fontspec_if_liiikeys:TF {
    \keys_define:nn {fontspec-preparse-external} { #1 .code:n = {#2}}
  } {
    \define@key[zf]{preparse-external}{#1}{#2}
  }
}

\cs_new:Nn \ltj_fontspec_select:nn {
  \group_begin:
  \ltj_fontspec_define_option:nn {JFM} {
    \fontspec_update_fontid:n  {+jfm=##1}
    \fontspec_update_featstr:n {jfm=##1}      
  }
  \ltj_fontspec_define_option:nn {JFM-var} {
    \fontspec_update_fontid:n  {+jfmvar=##1}
    \fontspec_update_featstr:n {jfmvar=##1}      
  }
  \ltj_fontspec_define_preparse_external:nn {NoEmbed} {
    \cs_set:Nn \fontspec_namewrap:n {psft:####1}
  }
  %% Omit the warning message
  %% "OpenType feature 'Kerning=Off' (-kern) not available ..."
  \ltj_fontspec_define_option:nn {Kerning/Off} {
    \fontspec_update_fontid:n  {-kern}
    \fontspec_update_featstr:n {-kern}      
  }  
  \ltj_fontspec_if_liiikeys:TF {
    \tl_set:Nn \g_fontspec_encoding_tl {JY3}
  } {
    \tl_set:Nn \zf@enc {JY3}
  }
  \tl_set:Nx \g_fontspec_default_fontopts_tl 
             {JFM=ujis,Scale=0.962216,Kerning=Off,\g_ltj_fontspec_default_fontopts_tl}
  \cs_set_eq:NN \DeclareFontFamily \DeclareKanjiFamily
  \fontspec_select:nn{#1}{#2}
  \group_end:
  \ltj_fontspec_if_liiikeys:F {
    \tl_set_eq:NN \l_fontspec_family_tl \zf@family
  }
}

\cs_new:Nn \ltj_fontspec_set_family:Nnn {
  \ltj_fontspec_select:nn{#2}{#3}
  \tl_set_eq:NN #1 \l_fontspec_family_tl
}

\DeclareDocumentCommand \jfontspec { O{} m } {
  \ltj_fontspec_set_family:Nnn \k@family {#1}{#2}
  \selectfont
  \ignorespaces
}

\DeclareDocumentCommand \setmainjfont { O{} m } {
  \ltj_fontspec_set_family:Nnn \mcdefault {#1}{#2}
  \normalfont
}

\DeclareDocumentCommand \setsansjfont { O{} m } {
  \ltj_fontspec_set_family:Nnn \gtdefault {#1}{#2}
  \normalfont
}

\DeclareDocumentCommand \newjfontfamily { m O{} m } {
  \ltj_fontspec_select:nn{#2}{#3}
  \use:x {
    \exp_not:N \DeclareRobustCommand \exp_not:N #1 {
      \exp_not:N \kanjifamily {\l_fontspec_family_tl} \exp_not:N \selectfont
    }
  }
}

\DeclareDocumentCommand \newjfontface { m O{} m } {
  \newjfontfamily #1 [ BoldFont={},ItalicFont={},SmallCapsFont={},#2 ] {#3}
}

\DeclareDocumentCommand \defaultjfontfeatures {m} {
  \tl_set:Nn \g_ltj_fontspec_default_fontopts_tl {#1,}
}

\tl_clear:N \g_ltj_fontspec_default_fontopts_tl

\DeclareDocumentCommand \addjfontfeatures {m} {
  \ifcsname zf@family@fontdef\k@family\endcsname
    \group_begin:
      \tl_clear:N \g_ltj_fontspec_default_fontopts_tl
      \use:x {
        \exp_not:N\ltj_fontspec_select:nn
          {\csname zf@family@options\k@family\endcsname,#1}
          {\csname zf@family@fontname\k@family\endcsname}
      }
    \group_end:
    \fontfamily\l_fontspec_family_tl\selectfont
  \else
    \ltj_fontspec_warning:n {addjfontfeatures-ignored}
  \fi
  \ignorespaces
}

\cs_set_eq:NN \addjfontfeature \addjfontfeatures

\endinput
