%
% luatexja-fontspec-25c.sty
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{luatexja-fontspec-25c}[2018/06/15 fontspec support of LuaTeX-ja]
\RequirePackage{l3keys2e,luatexja}
\ExplSyntaxOn

%%%%%%%% Change Japanese font family by \rmfamily or not
\cs_new:Npn \ltj_fontspec_match_cmd {
  \renewcommand\jttdefault{\gtdefault}
  \@ltj@match@familytrue
  \DeclareDocumentCommand \setmonojfont { O{} m } {
    \ltj_fontspec_set_family:Nnn \jttdefault {##1}{##2}
    \normalfont
  }
}
\bool_if:NT  \ltj_fontspec_match_bool \ltj_fontspec_match_cmd

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

\msg_new:nnn {luatexja-fontspec} {altfont-ignored-by-norange}
{
  ignored~ sublist~ `#1'~ in~ AltFont~ (no~ range~ is~ specified).
}

\msg_new:nnn {luatexja-fontspec} {altfont-ignored-by-rangeonly}
{
  ignored~ sublist~ `#1'~ in~ AltFont~ (only~ range~ is~ specified).
}

\cs_generate_variant:Nn \prg_new_conditional:Nnn {Nnx}

%%%%%%%% Internal control sequences
%% Each CS is ltj_fontspec version that corresponds to original CS of fontspec.
\cs_new:Nn \ltj_fontspec_define_option:nn {
  \__fontspec_keys_define_code:nnn {fontspec} {#1} {#2}
}
\cs_new:Nn \ltj_fontspec_define_preparse_external:nn {
  \__fontspec_keys_define_code:nnn {fontspec-preparse-external} {#1} {#2}
}
\cs_new:Nn \ltj_fontspec_define_altfont_option:nn {
  \__fontspec_keys_define_code:nnn {fontspec-ltjaltfont} {#1} {#2}
}

%% Alternate Fonts
%% Spec: AltFont = {
%%   ...
%%   { Range = <range>, <font features> },
%%   { Range = <range>, Font = <font name>, <font features> },
%%   { Range = <range>, Font = <font name> },
%%   ...
%% }
\tl_new:N  \l_ltj_fontspec_altname_tl
\tl_new:N  \l_ltj_fontspec_altrange_tl
\clist_new:N  \l_ltj_fontspec_altfont_clist
\clist_new:N  \l_ltj_fontspec_altfont_leftover_clist
\int_new:N \g_ltj_fontspec_altnumber_int

\ltj_fontspec_define_altfont_option:nn {Range} {
  \tl_set:Nn \l_ltj_fontspec_altrange_tl {#1}
}
\ltj_fontspec_define_altfont_option:nn {Font} {
  \fontspec_complete_fontname:Nn \l_ltj_fontspec_altname_tl {#1}
}
\__fontspec_keys_define_code:nnn {fontspec-ltjaltfont-reparse} {AltFont} {
  \clist_put_right:Nn \l_ltj_fontspec_altfont_clist  { #1 }
}
\__fontspec_keys_define_code:nnn {fontspec-ltjaltfont-reparse} {YokoFeatures} {
  \clist_put_right:Nn \l_ltj_fontspec_fontfeat_yoko_clist { #1 }
}
\__fontspec_keys_define_code:nnn {fontspec-ltjaltfont-reparse} {TateFeatures} {
  \clist_put_right:Nn \l_ltj_fontspec_fontfeat_tate_clist { #1 }
}
\__fontspec_keys_define_code:nnn {fontspec-ltjaltfont-reparse} {TateFont} {
  \tl_if_empty:nF {#1} {
    \fontspec_complete_fontname:Nn \l_ltj_fontspec_fontname_tate_tl {#1}
  }
}
%%
\clist_new:N \l_ltj_fontspec_fontfeat_yoko_clist
\clist_new:N \l_ltj_fontspec_fontfeat_tate_clist
\tl_new:N    \l_ltj_fontspec_fontname_tate_tl

\cs_new:Npn \ltj_fontspec_DeclareFontFamily #1 #2 #3 {
  \DeclareKanjiFamily {JY3} {#2} {#3}
  \DeclareKanjiFamily {JT3} {#2} {#3}
}

\cs_set_eq:NN \__ltj_orig_fontspec_select_font_family:nn \__fontspec_select_font_family:nn
\cs_new_protected:Nn \ltj_fontspec_select_font_family:nn {
  \group_begin:
  \ltj_fontspec_define_option:nn {NoEmbed} {}
  \ltj_fontspec_define_option:nn {AltFont} {
    \clist_put_right:Nn \l_ltj_fontspec_altfont_clist { ##1 }
  }
  \ltj_fontspec_define_option:nn {CID} {
    \__fontspec_update_featstr:n {cid=##1}
  }
  \ltj_fontspec_define_option:nn {Kanjiskip} {
    \str_if_eq_x:nnTF {false} { \str_lower_case:n { ##1 } }{
      \__fontspec_update_featstr:n {-ltjksp}
    } {
      \__fontspec_update_featstr:n {+ltjksp}
    }
  }
  \ltj_fontspec_define_option:nn {JFM} {
    \__fontspec_update_featstr:n {jfm=##1}
  }
  % vary by shape
  \ltj_fontspec_define_option:nn {YokoFeatures} {
    \clist_put_right:Nn \l_ltj_fontspec_fontfeat_yoko_clist { ##1 }
  }
  \ltj_fontspec_define_option:nn {TateFeatures} {
    \clist_put_right:Nn \l_ltj_fontspec_fontfeat_tate_clist { ##1 }
  }
  \ltj_fontspec_define_option:nn {TateFont}
  {
    \tl_if_empty:nF {##1} {
      \fontspec_complete_fontname:Nn \l_ltj_fontspec_fontname_tate_tl {##1}
    }
  }
  \ltj_fontspec_define_option:nn {JFM-var} {
    \__fontspec_update_featstr:n {jfmvar=##1}
  }
  \ltj_fontspec_define_preparse_external:nn {NoEmbed} {
    \cs_set:Npn \__fontspec_fontname_wrap:n ##1 {psft:##1}
  }

  %% Omit the warning message
  %% "OpenType feature 'Kerning=Off' (-kern) not available ..."
  \keys_define:nn {fontspec-opentype} {
    Kerning/Off.code:n=\__fontspec_update_featstr:n {-kern}
  }
  \clist_set:Nx \g__fontspec_default_fontopts_clist {
    YokoFeatures = { JFM=ujis }, TateFeatures = { JFM=ujisv },
    Scale=\Cjascale, Kerning=Off, Script=CJK,
    \g__ltj_fontspec_default_fontopts_clist
  }
  \prop_set_eq:NN \g__fontspec_fontopts_prop \g__ltj_fontspec_fontopts_prop
  \cs_set_eq:NN \__fontspec_make_font_shapes:Nnnnn \ltj_fontspec_make_font_shapes:Nnnnn
  \cs_set_eq:NN \DeclareFontFamily \ltj_fontspec_DeclareFontFamily
  \tl_set:Nn \g_fontspec_encoding_tl {JY3}
  \__ltj_orig_fontspec_select_font_family:nn{#1}{#2}
  \group_end:
}

%% declare_shape

\cs_new:Nn \ltj_fontspec_declare_shape_yoko:nnnn {
  \ltj_fontspec_declare_shape_aux:nnnnnn {#1} {#2} {#3} {#4} { JY3 } { \l_ltj_fontspec_fontfeat_yoko_clist }
}
\cs_new:Nn \ltj_fontspec_declare_shape_tate:nnnn {
  \ltj_fontspec_declare_shape_aux:nnnnnn {#1} {#2} {#3} {#4} { JT3 } { \l_ltj_fontspec_fontfeat_tate_clist }
}
\cs_new:Nn \ltj_fontspec_declare_shape:nnnn {
  \ltj_fontspec_declare_shape_yoko:nnnn {#1} {#2} {#3} {#4}
  \ltj_fontspec_declare_shape_tate:nnnn {#1} {#2} {#3} {#4}
}
\cs_generate_variant:Nn \ltj_fontspec_declare_shape:nnnn {nnxx}
\cs_generate_variant:Nn \ltj_fontspec_declare_shape_yoko:nnnn {nnxx}
\cs_generate_variant:Nn \ltj_fontspec_declare_shape_tate:nnnn {nnxx}

\cs_new:Nn \ltj_fontspec_declare_shape_aux:nnnnnn
 {
  \tl_clear:N \l__fontspec_nfss_tl
  \tl_clear:N \l__fontspec_nfss_sc_tl
  \tl_set_eq:NN \l__fontspec_saved_fontname_tl \l_fontspec_fontname_tl

  \tl_set:Nn \g_fontspec_encoding_tl {#5}
  \tl_set:Nn \l__fontspec_nfss_enc_tl {#5}
  \exp_args:Nx \clist_map_inline:nn {#4}
   {
    \tl_clear:N \l__fontspec_size_tl
    \tl_set_eq:NN \l__fontspec_sizedfont_tl \l__fontspec_saved_fontname_tl % in case not spec'ed

    \keys_set_known:nxN {fontspec-sizing} { \exp_after:wN \use:n ##1 }
      \l__fontspec_sizing_leftover_clist
    \tl_if_empty:NT \l__fontspec_size_tl { \__fontspec_error:n {no-size-info} }

    \str_if_eq:nnTF { #5 } { JY3 } {
      % "normal"
      \__fontspec_load_fontname:n {\l__fontspec_sizedfont_tl}
    } {
      \tl_if_empty:NTF \l_ltj_fontspec_fontname_tate_tl
        { \__fontspec_load_fontname:n {\l__fontspec_sizedfont_tl} }
        { \__fontspec_load_fontname:n {\l_ltj_fontspec_fontname_tate_tl} }
    }
    \__fontspec_setup_nfss:Nnnn \l__fontspec_nfss_tl {#3} {#6} {}
   }
  \bool_set_true:N \l__fontspec_nosc_bool
  \__fontspec_declare_shapes_normal:nn  {#1} {#2}
  \__fontspec_declare_shape_slanted:nn  {#1} {#2}
 }

\cs_new:Nn \ltj_fontspec_set_family:Nnn {
  \cs_set_eq:NN \__fontspec_select_font_family:nn \ltj_fontspec_select_font_family:nn
  \__ltj_orig_fontspec_set_family:Nnn #1 {#2} {#3}
  \cs_set_eq:NN \__fontspec_select_font_family:nn \__ltj_orig_fontspec_select_font_family:nn
}
\cs_set_eq:NN \__ltj_orig_fontspec_set_family:Nnn \fontspec_set_family:Nnn
\cs_set_eq:NN \__ltj_orig_fontspec_make_font_shapes:Nnnnn \__fontspec_make_font_shapes:Nnnnn
\cs_set_eq:NN \__ltj_fontspec_orig_DeclareFontShape \DeclareFontShape

\cs_new:Nn \ltj_fontspec_make_font_shapes:Nnnnn {
  \group_begin:
    %% 基底フォント
    \cs_set_eq:NN \__fontspec_font_set:Nnn \use_none:nnn
    \cs_set_eq:NN \__fontspec_font_if_null:NT \use_none:nn
    \cs_set_eq:NN \__fontspec_declare_shape:nnxx \ltj_fontspec_declare_shape:nnxx
    \__ltj_orig_fontspec_make_font_shapes:Nnnnn {#1} {#2} {#3} {#4} {#5}
    %%
    \ltj_fontspec_make_font_shapes_alt:Nnnnnn {#1}{#2}{#3}
     {#4, \l_ltj_fontspec_fontfeat_yoko_clist}{#5} {JY3 }
    \ltj_fontspec_make_font_shapes_alt:Nnnnnn {#1}{#2}{#3}
     {#4, \l_ltj_fontspec_fontfeat_tate_clist}{#5} {JT3}
  \group_end:
 }

%%% Altfont 内部処理部
\cs_new:Nn \ltj_fontspec_make_font_shapes_alt:Nnnnnn {
  \group_begin:
    \str_if_eq:nnTF { #6 } { JY3 } {
      \cs_set_eq:NN \__fontspec_declare_shape:nnxx \ltj_fontspec_declare_shape_yoko:nnxx
    }{
      \cs_set_eq:NN \__fontspec_declare_shape:nnxx \ltj_fontspec_declare_shape_tate:nnxx
    }
    \keys_set_known:nn {fontspec-ltjaltfont-reparse} { #4 }
    \clist_if_empty:NF \l_ltj_fontspec_altfont_clist {
      \int_gzero:N \g_ltj_fontspec_altnumber_int
      \clist_map_inline:Nn \l_ltj_fontspec_altfont_clist {
        \tl_clear:N  \l_ltj_fontspec_altrange_tl
        \tl_set:Nn \l_ltj_fontspec_altname_tl { #1 }
        \tl_set:Nn \l_tmpa_tl { #1 }

        \keys_set_known:nxN {fontspec-ltjaltfont} { \exp_after:wN \use:n ##1 }
          \l_ltj_fontspec_altfont_leftover_clist
        \keys_set_known:nn {fontspec-ltjaltfont-reparse} { \exp_after:wN \use:n ##1 }

        \tl_if_empty:NT \l_ltj_fontspec_altrange_tl {
          \msg_warning:nnn  {luatexja-fontspec} {altfont-ignored-by-norange} { ##1 }
        } {
          \bool_if:nTF {
            \tl_if_eq_p:NN \l_ltj_fontspec_altname_tl \l_tmpa_tl
            &&
            \tl_if_empty_p:N \l_ltj_fontspec_altfont_leftover_clist
          } {
            \msg_warning:nnn  {luatexja-fontspec} {altfont-ignored-by-rangeonly} { ##1 }
          } {
            \__ltj_orig_fontspec_make_font_shapes:Nnnnn
                { \l_ltj_fontspec_altname_tl } {#2}
                {#3 _ alt \int_use:N \g_ltj_fontspec_altnumber_int }
                {#4, \l_ltj_fontspec_altfont_leftover_clist }
                {#5}
            \DeclareAlternateKanjiFont
              { #6 }{ \l_fontspec_family_tl }{#2}{#3}%
              { #6 }{ \l_fontspec_family_tl }{#2}
              { #3 _alt \int_use:N \g_ltj_fontspec_altnumber_int }
              { \l_ltj_fontspec_altrange_tl }
            \int_gincr:N \g_ltj_fontspec_altnumber_int
          }
        }
      }
    }
  \group_end:
}


%%%%%%%% User commands
\DeclareDocumentCommand \jfontspec { O{} m O{} } {
  \ltj_fontspec_set_family:Nnn \k@family {#1,#3}{#2}
  \selectfont
  \ignorespaces
}

\DeclareDocumentCommand \setmainjfont { O{} m O{} } {
  \ltj_fontspec_set_family:Nnn \mcdefault {#1,#3}{#2}
  \DeclareSymbolFont{mincho}{JY3}{\l_fontspec_family_tl}{\mddefault}{n}
  \SetSymbolFont{mincho}{bold}{JY3}{\l_fontspec_family_tl}{\bfdefault}{n}
  \normalfont
}

\DeclareDocumentCommand \setsansjfont { O{} m O{} } {
  \ltj_fontspec_set_family:Nnn \gtdefault {#1,#3}{#2}
  \DeclareMathAlphabet{\mathgt}{JY3}{\l_fontspec_family_tl}{\mddefault}{n}
  \normalfont
}

\DeclareDocumentCommand \newjfontfamily { m O{} m O{} } {
  \cs_set_eq:NN \fontspec_set_family:Nnn \ltj_fontspec_set_family:Nnn
  \newfontfamily #1 [#2,#4] {#3}
  \cs_set_eq:NN \fontspec_set_family:Nnn \__ltj_orig_fontspec_set_family:Nnn
}

\DeclareDocumentCommand \newjfontface { m O{} m O{} } {
  \newjfontfamily #1 [ BoldFont={},ItalicFont={},SmallCapsFont={},#2,#4 ] {#3}
}

\clist_new:N \g__ltj_fontspec_default_fontopts_clist
\prop_new:N \g__ltj_fontspec_fontopts_prop
\DeclareDocumentCommand \defaultjfontfeatures { t+ o m }
 {
  \IfNoValueTF {#2}
   { \__ltj_fontspec_set_default_features:nn {#1} {#3} }
   { \__ltj_fontspec_set_font_default_features:nnn {#1} {#2} {#3} }
  \ignorespaces
 }
\cs_new:Nn \__ltj_fontspec_set_default_features:nn
 {
   \clist_set_eq:NN \l__ltj_fontspec_tmp_clist \g__fontspec_default_fontopts_clist
   \clist_set_eq:NN \g__fontspec_default_fontopts_clist \g__ltj_fontspec_default_fontopts_clist
   \__fontspec_set_default_features:nn {#1} {#2}
   \clist_set_eq:NN \g__ltj_fontspec_default_fontopts_clist \g__fontspec_default_fontopts_clist
   \clist_set_eq:NN \g__fontspec_default_fontopts_clist \l__ltj_fontspec_tmp_clist
 }
\cs_new:Nn \__ltj_fontspec_set_font_default_features:nnn
 {
   \prop_set_eq:NN \l__ltj_fontspec_tmp_prop \g__fontspec_fontopts_prop
   \prop_set_eq:NN \g__fontspec_fontopts_prop \g__ltj_fontspec_fontopts_prop
   \__fontspec_set_font_default_features:nnn {#1} {#2} {#3}
   \prop_set_eq:NN \g__ltj_fontspec_fontopts_prop \g__fontspec_fontopts_prop
   \prop_set_eq:NN \g__fontspec_fontopts_prop \l__ltj_fontspec_tmp_prop
 }

\DeclareDocumentCommand \addjfontfeatures {m} {
  \ltj_fontspec_if_fontspec_font:TF
   {
    \group_begin:
      \tl_set_eq:NN \f@family \k@family
      \cs_set_eq:NN \__fontspec_select_font_family:nn \ltj_fontspec_select_font_family:nn
      \addfontfeatures {#1}
    \group_end:
    \fontfamily\l_fontspec_family_tl\selectfont
   }{
    \msg_warning:nn  {luatexja-fontspec} {addjfontfeatures-ignored}
   }
  \ignorespaces
}

\cs_set_eq:NN \addjfontfeature \addjfontfeatures

\prg_new_conditional:Nnn \ltj_fontspec_if_fontspec_font: {TF,T,F}
{
  \cs_if_exist:cTF {g__fontspec_ \k@family _prop} \prg_return_true: \prg_return_false:
}

\endinput
