%
% luatexja-fontspec.sty
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{luatexja-fontspec}[2013/08/17 fontspec support of LuaTeX-ja]

\RequirePackage{fontspec,luatexja}
\ExplSyntaxOn

%%%%%%%% Messages
\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}

%%%%%%%% For compatibility with old fontspec.
\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)
}

%%%%%%%% \g_ltj_fontspec_scale_fp
%% Default scale value for jfont.
\group_begin:
\fontsize{10}{10}\selectfont
\fp_gset:Nn \g_ltj_fontspec_scale_fp {\zw / 10}
\group_end:

%%%%%%%% Internal control sequences
%% Each CS is ltj_fontspec version that corresponds to original CS of fontspec.
\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 {CID} {
    \fontspec_update_fontid:n  {+cid=##1}
    \fontspec_update_featstr:n {cid=##1}
  }
  \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=\fp_use:N \g_ltj_fontspec_scale_fp,Kerning=Off,\g_ltj_fontspec_default_fontopts_tl}
  \prop_set_eq:NN \g__fontspec_fontopts_prop \g__ltj_fontspec_fontopts_prop
  \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
}

%%%%%%%% User commands
\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}
  \DeclareSymbolFont{mincho}{JY3}{\l_fontspec_family_tl}{m}{n}
  \SetSymbolFont{mincho}{bold}{JY3}{\l_fontspec_family_tl}{bx}{n}
  \normalfont
}

\DeclareDocumentCommand \setsansjfont { O{} m } {
  \ltj_fontspec_set_family:Nnn \gtdefault {#1}{#2}
  \DeclareMathAlphabet{\mathgt}{JY3}{\l_fontspec_family_tl}{m}{n}
  \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}
}

\tl_new:N \g_ltj_fontspec_default_fontopts_tl
\prop_new:N \g__ltj_fontspec_fontopts_prop
\DeclareDocumentCommand \defaultjfontfeatures { o m }
 {
  \IfNoValueTF {#1}
   { \__ltj_fontspec_set_default_features:n {#2} }
   { \__ltj_fontspec_set_font_default_features:nn {#1} {#2} }
 }
\cs_new:Nn \__ltj_fontspec_set_default_features:n
 {
  \tl_set:Nn \g_ltj_fontspec_default_fontopts_tl {#1,}
 }
\cs_new:Nn \__ltj_fontspec_set_font_default_features:nn
 {
  \__fontspec_sanitise_fontname:Nn \l__fontspec_tmp_tl {#1}
  \tl_if_empty:nTF {#2}
   { \prop_gremove:NV \g__ltj_fontspec_fontopts_prop \l__fontspec_tmp_tl }
   { \prop_gput:NVn   \g__ltj_fontspec_fontopts_prop \l__fontspec_tmp_tl {#2} }
 }

\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

%%% CJKShape=JIS2004
\fontspec_define_feature_option:nnnnn{CJKShape}{JIS2004}{20}{5}{+jp04}

\ExplSyntaxOff
%%%%%%%% Now we completely ignore kanjifont definition file.

\DeclareRobustCommand\fontfamily[1]{%
  \@notkfamfalse\@notffamfalse\edef\tmp@item{{#1}}%
  \ifcsname \k@encoding+#1\endcsname % if \k@encoding+#1 is already defined
    \edef\k@family{#1}%
  \else
    \def\@temp##1+{\lowercase{\def\@@temp{##1#1.fd}}}\expandafter\@temp\k@encoding+%
    \@notkfamtrue
  \fi
  \ifcsname \f@encoding+#1\endcsname
    \edef\f@family{#1}%
  \else % search font definition file...
     \ifcsname ffam@list@\f@encoding\endcsname\else
       \expandafter\gdef\csname ffam@list@\f@encoding\endcsname{}%
       \expandafter\gdef\csname notffam@list@\f@encoding\endcsname{}%
     \fi
     \edef\@templist{\@nameuse{ffam@list@\f@encoding}}%
     \expandafter\expandafter\expandafter\inlist@\expandafter\tmp@item\expandafter{\@templist}%
     \ifin@\edef\f@family{#1}\else
       \edef\@templist{\@nameuse{notffam@list@\f@encoding}}%
       \expandafter\expandafter\expandafter\inlist@\expandafter\tmp@item\expandafter{\@templist}%
       \ifin@\@notffamtrue\else
         \def\@temp##1+{\lowercase{\def\@@temp{##1#1.fd}}}\expandafter\@temp\f@encoding+%
         \message{(I search font definition file. \@@temp)}%
         \IfFileExists{\@@temp}{\@tempswztrue}{\@tempswzfalse}%
         \if@tempswz
           \expandafter\xdef\csname ffam@list@\f@encoding\endcsname
             {\@nameuse{ffam@list@\f@encoding}\fam@elt<#1>}\edef\f@family{#1}%
         \else
           \expandafter\xdef\csname notffam@list@\f@encoding\endcsname
             {\@nameuse{notffam@list@\f@encoding}\fam@elt<#1>}\@notffamtrue%
         \fi
       \fi
     \fi
  \fi
  \if@notkfam\if@notffam
      {\ifcsname D@\k@encoding\endcsname\@nameuse{D@\k@encoding}\fi
        \xdef\@@temp{\default@family}}\edef\k@family{\@@temp}%
      {\ifcsname D@\f@encoding\endcsname\@nameuse{D@\f@encoding}\fi
        \xdef\@@temp{\default@family}}\edef\f@family{\@@temp}%
  \fi\fi
}

% We must redefine \try@load@fontshape to ignore kanjifont definitions at all.
\def\try@load@fontshape{%
   \expandafter
   \ifx\csname \f@encoding+\f@family\endcsname\relax
       \edef\tmp@item{{\directlua{%
         tex.print(luatexbase.catcodetables["latex-package"], '\f@encoding')}%
       }}% \f@encoding の展開結果の catcode は 12 であるため，これで補正．
       \expandafter\expandafter\expandafter
       \inlist@\expandafter\tmp@item\expandafter{\kenc@list}%
\ifin@ % Japanese font: we don't search fd.
    \@font@warning{We don't search kanjifont definition
      \MessageBreak for \f@encoding/\f@family}%
\else % Alphabetic font
    \@font@info{Try loading font information for
                   \f@encoding+\f@family}%
    \global\expandafter\let
       \csname\f@encoding+\f@family\endcsname\@empty
     \nfss@catcodes
     \let\nfss@catcodes\relax
     \edef\reserved@a{%
       \lowercase{%
         \noexpand\InputIfFileExists{\f@encoding\f@family.fd}}}%
     \reserved@a\relax
          {\@input@{\f@encoding\f@family.fd}}%
\fi
   \fi}


\endinput
