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%
% ltj-base.sty
%

%! これは外から読まれない
%% Avoid multiple loading.
\csname luatexjabaseLoaded\endcsname
\edef\ltj@base@AtEnd{%
\endlinechar=\the\endlinechar
\relax}
\endlinechar=-1 %
\def\luatexjabaseLoaded{\endinput}

\ifltj@in@latex                 %<*LaTeX>
  \NeedsTeXFormat{LaTeX2e}
  \ProvidesPackage{ltj-base}[2020-08-04]
\fi                             %</LaTeX>

%%------------------ Tiny helpers

%% Registers
%\newcount\ltj@tempcnta % defined at luatexja-core.sty
\newcount\ltj@tempcntb
\newcount\ltj@tempcntc
\newdimen\ltj@tempdima
% \newskip\ltj@tempskipa unused
% \newtoks\ltj@temptoks unused

\countdef\ltj@@count@zero=0 %
\luatexattributedef\ltj@@attr@zero=0 %
\dimendef\ltj@@dimen@zero=0 %
\skipdef\ltj@@skip@zero=0 %

%% Quarks
%! ただ expl3 の quark とは異なり展開されるとエラーになる.
%% \ltj@q@stop
\protected\def\ltj@q@stop{\ltj@q@stop@}
%% \ltj@q@nil
\protected\def\ltj@q@nil{\ltj@q@nil@}
%% \ltj@q@mark
\protected\def\ltj@q@mark{\ltj@q@mark@}

%! etoolbox の \letcs, \cslet, \csletcs.
%% \ltj@letcs
\protected\def\ltj@letcs#1#2{
  \expandafter\let\expandafter#1\csname#2\endcsname
}

%% \ltj@cslet
\protected\def\ltj@cslet#1#2{
  \expandafter\let\csname#1\endcsname#2
}

%% \ltj@csletcs
\protected\def\ltj@csletcs#1#2{
  \expandafter\let\csname#1\expandafter\endcsname
  \csname#2\endcsname
}

%% \ltj@ifx{<sutff>}{<yes>}{<no>}
%! LaTeX 形式の \ifx. この形式の利点は自動的に条件ネストからの
%! 脱出が可能であること.
% Does \ifx<stuff> test in LaTeX style.
\long\def\ltj@ifx#1{
  \ifx#1\expandafter\ltx@firstoftwo
  \else\expandafter\ltx@secondoftwo\fi
}

%% \ltj@if@empty{<stuff>}{<yes>}{<no>}
%! <stuff> が空であるか.
% Checks if <stuff> is empty.
\long\def\ltj@if@empty#1{
  \ltj@ifx{\ltj@@q@empty#1\ltj@@q@empty}
}
\protected\def\ltj@@q@empty{\ltj@@q@empty@}

%% \ltj@if@blank{<stuff>}{<yes>}{<no>}
%! <stuff> が空または空白文字からなるか.
% Checks if <stuff> is either empty or consisting only of spaces.
\def\ltj@if@blank#1{
  \ltj@@if@blankA#1\ltj@@q@empty\ltj@@q@empty
   \ltx@secondoftwo\ltx@firstoftwo\ltj@q@nil
}
\long\def\ltj@@if@blankA#1#2\ltj@@q@empty#3#4#5\ltj@q@nil{
  #4
}

%%------------------ LaTeX vs plain
\ifltj@in@latex            %<*LaTeX>

%% \ifltj@in@latex
%! LaTeX であるか.
%(Defined in luatexja-core.sty.)

%% \ifltj@in@plain
%! plain であるか.
\ltj@csletcs{ifltj@in@plain}{iffalse}

%% \ltj@print{<message>}
%! 端末への出力.
\let\ltj@print\typeout

\else                           %<*!LaTeX>

%% \ifltj@in@plain
\ifnum\pdf@strcmp{\fmtname}{plain}=0 %
  \ltj@csletcs{ifltj@in@plain}{iftrue}
\else
  \ltj@csletcs{ifltj@in@plain}{iffalse}
\fi

%% \ltj@print{<message>}
\def\ltj@print#1{
  \immediate\write16{#1}
}

\fi                             %</LaTeX>
%%------------------ Value-token handling

%% helper stuffs

%% \ltj@gobble@num <number>
%! 次に続く整数を(2 回展開で)読み捨てる. 
\def\ltj@gobble@num{
  \directlua{token.scan_int()}
}

%% \ltj@gobble@glue <glue>
%! 次に続くグルー値を(2 回展開で)読み捨てる. 
\def\ltj@gobble@glue{
  \directlua{token.scan_glue()}
}

%% \ltj@gobble@dimen <dimen>
%! 次に続く寸法値を(2 回展開で)読み捨てる. 
\def\ltj@gobble@dimen{
  \directlua{token.scan_dimen()}
}

%% \ltj@grab@num <number>
%! 次に続く整数を読み取って, それと等しい整数を表すトークン列
%! (必ずしも整数表記とは限らない)を { } に入れたものに(2 回で)
%! 展開する.
%! ただし, 整数は以下の形式のいずれかでなければならない.
%! - 整数表記(10 進, 8 進, 16 進, 文字)
%! - chardef トークン
%! - 内部整数パラメタ, countdef トークン
%!   (command_name が "assign_int" であるトークン).
%! (注意: まだ文字表記(`A)に対応していません.)
\def\ltj@grab@num{
  \directlua{tex.sprint('{' .. token.scan_int() .. '}')}
}

%%------------------ Safe passing

% These macros convert a token sequence denoting a TeX value to its
% suitable notation in Lua, and when the argument is malformed then
% 'nil' is returned. They are all fully-expandable.
%! TeX の値を Lua 上の表記に変換する. 不正形式だと nil にする.

\def\ltj@@safe@end{\noexpand\ltj@@safe@end}
  % behaves same as \relax but is distinct from it

%% \ltj@safe@invalid
% The value passed to lua instead of malformed value tokens.
\def\ltj@safe@invalid{(nil)}

%% \ltj@safe@num{<number>}
%! 整数.
% For a number (integer).
\def\ltj@safe@num{
  \ltj@safe@num@or\ltj@safe@invalid
}
\def\ltj@safe@num@or#1#2{
  \expandafter\expandafter\expandafter\ltj@@safe@numA
   \ltj@gobble@num#2\ltj@@safe@end{#2}{#1}
}
\def\ltj@@safe@numA#1\ltj@@safe@end#2#3{
  \ltj@if@blank{#1}{
    (\number#2)
  }{
    #3
  }
}

%% \ltj@safe@dimen{<dimen>}
%! 寸法値.
% For a dimension. The result is a scaled-point value.
\def\ltj@safe@dimen{
  \ltj@safe@dimen@or\ltj@safe@invalid
}
\def\ltj@safe@dimen@or#1#2{
  \expandafter\expandafter\expandafter\ltj@@safe@dimenA
   \ltj@gobble@dimen#2\ltj@@safe@end{#2}{#1}
}
\def\ltj@@safe@dimenA#1\ltj@@safe@end#2#3{
  \ltj@if@blank{#1}{
    (\number\dimexpr#2\relax)
  }{
    #3
  }
}

%% \ltj@safe@real{<real>}
%! 実数. これは十進表記に限る.
% For a real number given in decimal notation or a macro that
% expands to such notation.
\def\ltj@safe@real#1{
  (tonumber("\luatexluaescapestring{#1}"))
}

%% \ltj@val@counter{<counter>}
%! LaTeX カウンタの現在値.
% For the current value of a LaTeX counter.
\def\ltj@val@counter#1{
  (\expandafter\number\csname c@#1\endcsname)
}

%% \ltj@val@skip{<skip>}
% For the current value of a skip (or LaTeX-length) parameter.
%! グルーレジスタ(LaTeX 長さ変数).
%! 整形式のグルー値にも使える.
\def\ltj@val@skip#1{
  (luatexja.base.to_skip("\the\glueexpr#1\relax"))
}
%! 整形式の整数 → 数値 : \number#1
%! 内部寸法 → 数値 : \number#1
%! 整形式の寸法 → 数値 : \number\dimexpr#1\relax

%% \ltj@safe@str{<text>}
%! 文字列. (トークン列を非トークン化)
% Converts a token sequence to Lua string notation.
\def\ltj@safe@str#1{
  "\luatexluaescapestring{\detokenize{#1}}"
}

%% \ltj@luaescape{<text>}
%! 非トークン化して Lua エスケープ.
\def\ltj@luaescape#1{
  \luatexluaescapestring{\detokenize{#1}}
}
%% \ltj@luaxescape{<text>}
%! 非トークン化せずに(展開ありで) Lua エスケープ.
%! つまり単なる \luatexescape.
\let\ltj@luaxescape\luatexluaescapestring


%%------------------ debug logging
\ifdefined\LuaTeXjaDebugEnabled

%% Load Lua module
\RequireLuaModule{luatexja.debug}

%% \ltj@debug{<format>}{<arg>,...}
\def\ltj@debug#1#2{
  \directlua{
    luatexja.base.debug(\ltj@safe@str{#1}
      \ltj@if@blank{#2}{}{, }
      #2)
  }
}

%% \ltj@package@debug{<package>}{<format>}{<arg>,...}
\def\ltj@package@debug#1#2#3{
  \directlua{
    luatexja.base.package_debug(\ltj@safe@str{#1},
      \ltj@safe@str{#2}
      \ltj@if@blank{#3}{}{, }
      #3)
  }
}

\else

\def\ltj@debug#1#2{}
\def\ltj@package@debug#1#2#3{}

\fi

%% \ltj@debug@logger\CS{<package>}
\def\ltj@debug@logger#1#2{
  \def#1{\ltj@package@debug{#2}}
}

%% \ltj@afterbox <token><box>
%% -> \setbox\ltj@afbox<box><token>
%% from Sonja Maus, ``Looking Ahead for a <box>'',
%%      TUGBoat, 11, No. 4, 1990.
\newbox\ltj@afbox
\directlua{luatexja.afbox_number=\the\ltj@afbox}
\protected\def\ltj@afterbox#1{%
  \def\ltj@afb@xarg{#1}%
  \afterassignment\ltj@afb@x
  \chardef\ltj@@next`.}
\def\ltj@afb@x{\futurelet\ltj@@next\ltj@afb@xtest}
\def\ltj@afb@xtest{%
  \ifcase\ifx\ltj@@next\hbox\tw@\fi
         \ifx\ltj@@next\vbox\tw@\fi
         \ifx\ltj@@next\vtop\tw@\fi
         \ifx\ltj@@next\box\@ne\fi
         \ifx\ltj@@next\copy\@ne\fi
         \ifx\ltj@@next\vsplit\@ne\fi
         \ifx\ltj@@next\lastbox\@ne\fi
         0% ``A <box> was ...'' error will be causes by \setbox later anyway.
  \or\afterassignment\ltj@afb@xarg
  \or\afterassignment\ltj@afb@xagarg
  \fi
  \setbox\ltj@afbox
}
\def\ltj@afb@xagarg{\aftergroup\ltj@afb@xarg}


%%------------------ all done
\ltj@base@AtEnd
\endinput
%% EOF