%
% plistings.sty
%
% lltjp-listings.sty ベース，コード未整理

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{plistings}[2020-03-24 v0.14 Japanese support of listings package]

%%%%%%%% Package options
\DeclareOption*{\PassOptionsToPackage{\CurrentOption}{listings}}
\ProcessOptions\relax
\RequirePackage{listings,etoolbox}

%%%%%%%% Japanese support
%% whether letter-space in a fixed mode box is doubled or not
\newif\if@ltj@lst@double
\lst@Key{doubleletterspace}f[t]{\lstKV@SetIf{#1}\if@ltj@lst@double}

% override \lst@FillFixed@
\def\lst@FillFixed@#1{%
  \ifx\@empty#1\else\ltj@lst@hss#1\expandafter\lst@FillFixed@\fi}
\def\ltj@lst@hss@double{\lst@hss\lst@hss}
\def\lst@FillFixed#1{{\null#1\null}\lst@FillFixed@}
\def\lst@FillFixed@#1{%
  \ifx\@empty#1\else\ltj@lst@hss{\null#1\null}\expandafter\lst@FillFixed@\fi}
\let\lst@FillOutputBox\lst@FillFixed
% [space/full]flexiblemode (not much useful...)
\def\ltj@lst@FillFlex#1\@empty{\null#1\null}
\patchcmd\lst@column@flexible
  {\let\lst@FillOutputBox\@empty}{\let\lst@FillOutputBox\ltj@lst@FillFlex}{}{}
\patchcmd\lst@column@fullflexible
  {\let\lst@FillOutputBox\@empty}{\let\lst@FillOutputBox\ltj@lst@FillFlex}{}{}
\patchcmd\lst@column@spaceflexible
  {\let\lst@FillOutputBox\@empty}{\let\lst@FillOutputBox\ltj@lst@FillFlex}{}{}

% 最下層の処理
\newif\if@ltj@lst@kanji
\lst@AddToHook{InitVars}{\@ltj@lst@kanjifalse}

\def\lst@AppendLetter{%
    \ltj@lst@setletterflag\lst@Append}
\def\lst@AppendOther{%
    \lst@ifletter\lst@Output\lst@letterfalse\fi\@ltj@lst@kanjifalse
    \futurelet\lst@lastother\lst@Append}

\def\ltj@lst@setletterflag{%
  \lst@ifletter
    \if@ltj@lst@kanji\lst@Output\@ltj@lst@kanjifalse\fi
  \else
    \lst@lettertrue\if@ltj@lst@kanji\@ltj@lst@kanjifalse\else\lst@OutputOther\fi
  \fi}

\def\ltj@lst@setkanjiflag{%
  \lst@ifletter
    \lst@Output
  \else
    \if@ltj@lst@kanji\else\lst@OutputOther\fi\lst@lettertrue
  \fi\@ltj@lst@kanjitrue}

\def\ltj@lst@setopenflag{%
  \lst@ifletter
    \lst@letterfalse\lst@Output
  \else
    \if@ltj@lst@kanji\else\lst@OutputOther\fi
  \fi\@ltj@lst@kanjitrue}

\def\ltj@lst@setcloseflag{%
  \lst@ifletter\else\lst@lettertrue\fi\@ltj@lst@kanjitrue}

%%%% 和文文字の出力命令．
%%%% 和文文字の前にこれが前置されることになる．
\def\ltj@lst@ProcessJALetter#1{%
  \lst@whitespacefalse
  \ifnum`#1>255
    \ifnum\postbreakpenalty`#1>0
      \ltj@lst@setopenflag    % 開き括弧類
    \else
      \ifnum\prebreakpenalty`#1>0
        \ltj@lst@setcloseflag % 閉じ括弧類，句読点
      \else
        \ltj@lst@setkanjiflag % 通常の和文文字
    \fi\fi
    \ifdefined\ucs
      \ifodd \ifnum`#1<"FF65 1\else\ifnum`#1>"FF9F 1\else 0\fi\fi
        \advance\lst@length\@ne   % 普通の和文文字は通常の2倍の幅
      \fi
    \fi
  \else
    \ltj@lst@setletterflag
  \fi
  \lst@Append#1}


%%%% \lst@InsideConvert の処理内容変更
%%%% active 文字化に加え，^^@ を和文文字の前に前置
\def\ltj@lst@MakeActive#1{%
    \let\lst@temp\@empty \ltj@lst@MakeActive@#1\relax}
\begingroup
\catcode`\^^A=\active
\catcode`\^^@=\active
\lowercase{%
\gdef\ltj@lst@MakeActive@#1{\let\lst@next\relax%
    \ifx#1\relax
    \else\let\lst@next\ltj@lst@MakeActive@
    \ifnum`#1>255
      \lst@lAddTo\lst@temp{^^@#1}%
    \else
      \lccode`\^^A=`#1 
      \lowercase{\lst@lAddTo\lst@temp{^^A}}%
    \fi\fi\lst@next}}
\endgroup
\begingroup \lccode`\~=`\ \relax \lowercase{%
\gdef\lst@InsideConvert@#1 #2{%
    \ltj@lst@MakeActive{#1}%
    \ifx\@empty#2%
        \lst@lExtend\lst@arg{\lst@temp}%
    \else
        \lst@lExtend\lst@arg{\lst@temp~}%
        \expandafter\lst@InsideConvert@
    \fi #2}
}\endgroup


%%%%%%%% \lstinline の再定義．
%%%% 引数を全部読み込み，\lst@InsideConvert で変換
\renewcommand\lstinline[1][]{%
    \leavevmode\bgroup % \hbox\bgroup --> \bgroup
      \def\lst@boxpos{b}%
      \lsthk@PreSet\lstset{flexiblecolumns,#1}%
      \lsthk@TextStyle
      \@ifnextchar\bgroup \ltj@lst@InlineG \ltj@lstinline@}
\def\ltj@lstinline@#1{%
  \edef\ltj@lst@temp{\the\catcode`#1}\lst@Init\relax\catcode`#1\ltj@lst@temp
  \lst@Def{13}{\lst@DeInit\egroup \global\let\lst@inlinechars\@empty
     \PackageError{Listings}{lstinline ended by EOL}\@ehc}%
  \lst@InlineJ#1}
\def\ltj@lst@InlineG{%
  \lst@Init\relax\edef\ltj@lst@temp{\the\catcode`\}}%
  \catcode`\}=2 \catcode`\ =12\relax
  \lst@Def{13}{\lst@DeInit\egroup \global\let\lst@inlinechars\@empty
     \PackageError{Listings}{lstinline ended by EOL}\@ehc}%
  \let\lst@arg\@empty\afterassignment\ltj@lst@InlineG@@\@temptokena}
\def\ltj@lst@InlineG@@{%
  \catcode`\}=\ltj@lst@temp
  \expandafter\expandafter\expandafter\lst@InsideConvert%
  \expandafter{\the\@temptokena}\lst@arg\lst@DeInit\egroup}

%%%%%%%% \lstenv@process の再定義
%%%% 基本的にはインライン時と同様に全トークンを読み込み→\lst@InsideConvert で変換
%%%% その後，変換した中身は \scantokens で読み込み直される
\begingroup \lccode`\~=`\^^M\lowercase{%
\gdef\lstenv@Process#1{%
    \ifx~#1%
        \lstenv@DroppedWarning \let\lst@next\ltj@lstenv@ProcessM
    \else\ifx^^J#1%
        \lstenv@DroppedWarning \let\lst@next\lstenv@ProcessJ
    \else
        \let\lst@dropped#1\let\lst@next\lstenv@Process
    \fi \fi
    \lst@next}
}\endgroup
\begingroup\lccode`\[=`\{\lccode`\]=`\}\lccode`|=`\\\lowercase{%
\gdef\ltj@lstenv@ProcessM{%
    \let\lst@arg\@empty
    \edef\lst@temp{|end[\lstenv@name]}%
    \expandafter\expandafter\expandafter\lst@InsideConvert%
        \expandafter{\lst@temp}%
    \@temptokena{%
        \expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter
        \lst@SkipToFirst\expandafter\expandafter\expandafter\scantokens\expandafter{\lst@arg}%
    }
    \expandafter\expandafter\expandafter\toks@\expandafter{\lst@arg}
    \expandafter\edef\expandafter\lst@temp\expandafter##\expandafter1\lst@arg
    {%
        \noexpand\let\noexpand\lst@arg\noexpand\@empty%
        \noexpand\lst@InsideConvert{\noexpand##1}
        \the\@temptokena
        \noexpand\ifnum\noexpand\catcode92=\noexpand\z@
          \noexpand\end{\lstenv@name}%
        \noexpand\else\the\toks@\noexpand\fi\tracingnone
    }%
    \lst@temp}
}\endgroup

\def\lst@BeginDropInput#1{%
    \lst@EnterMode{#1}%
    {\lst@modetrue
     \let\lst@OutputBox\@gobble
     \let\lst@ifdropinput\iftrue
     \let\lst@ProcessLetter\@gobble
     \let\lst@ProcessDigit\@gobble
     \let\lst@ProcessOther\@gobble
     \let\lst@ProcessSpace\@empty
     \let\lst@ProcessTabulator\@empty
     \let\lst@ProcessFormFeed\@empty
     \let\ltj@lst@ProcessJALetter\@gobble     % added
}}


%%%% ^^@ を active 文字化 (\ltj@lst@ProcessJALetter)
\begingroup\catcode`\^^@=\active
\lst@AddTo\lst@SelectStdCharTable{\def^^@{\ltj@lst@ProcessJALetter}}
\endgroup
\lst@AddToHook{InitVars}{%
  \catcode`\^^@=\active
  \if@ltj@lst@double
    \let\ltj@lst@hss=\ltj@lst@hss@double
  \else
    \let\ltj@lst@hss=\lst@hss
  \fi
}

%%%% 白線対策のため，\lineskiplimit を負の値にする
\newif\ifltj@lst@frame@top
\newdimen\ltj@lst@frame@lslimit
\gdef\lst@frameInit{%
    \ltj@lst@frame@toptrue
    \ifx\lst@framelshape\@empty \let\lst@frameL\@empty \fi
    \ifx\lst@framershape\@empty \let\lst@frameR\@empty \fi
    \def\lst@framevrule{\vrule\@width\lst@framerulewidth\relax}%
    \lst@ifframeround
        \lst@frameCalcDimA\z@ \@getcirc\@tempdima
        \@tempdimb\@tempdima \divide\@tempdimb\tw@
        \advance\@tempdimb -\@wholewidth
        \edef\lst@frametextsep{\the\@tempdimb}%
        \edef\lst@framerulewidth{\the\@wholewidth}%
        \lst@frameCalcDimA\@ne \@getcirc\@tempdima
        \@tempdimb\@tempdima \divide\@tempdimb\tw@
        \advance\@tempdimb -\tw@\@wholewidth
        \advance\@tempdimb -\lst@frametextsep
        \edef\lst@rulesep{\the\@tempdimb}%
    \fi
    \lst@frameMakeBoxV\lst@framebox{\ht\strutbox}{\dp\strutbox}%
    %%%%  ここから
    \@tempdima\z@
    \ifdim\ht\strutbox<\cht\@tempdima=\dimexpr\cht-\ht\strutbox\relax\fi
    \ifdim\dp\strutbox<\cdp\advance\@tempdima=\dimexpr\cdp-\dp\strutbox\relax\fi
    \ltj@lst@frame@lslimit=-\@tempdima
    \def\lst@framelr{%
      \ifltj@lst@frame@top\ltj@lst@frame@topfalse\else\lineskiplimit\ltj@lst@frame@lslimit\fi
      \copy\lst@framebox}%
    %%%% ここまで
    \ifx\lst@frametshape\@empty\else
        \lst@frameH T\lst@frametshape
        \ifvoid\z@\else
            \par\lst@parshape
            \@tempdima-\baselineskip \advance\@tempdima\ht\z@
            \ifdim\prevdepth<\@cclvi\p@\else
                \advance\@tempdima\prevdepth
            \fi
            \ifdim\@tempdima<\z@
                \vskip\@tempdima\vskip\lineskip
            \fi
            \noindent\box\z@\par
            \lineskiplimit\maxdimen \lineskip\z@
        \fi
        \lst@frameSpreadV\lst@framextopmargin
    \fi}

% lstinputlisting
% modified from jlisting.sty
\def\lst@InputListing#1{%
   \begingroup
      \lsthk@PreSet \gdef\lst@intname{#1}%
      \expandafter\lstset\expandafter{\lst@set}%
      \lsthk@DisplayStyle
      \catcode\active=\active
      \lst@Init\relax \let\lst@gobble\z@
      \lst@SkipToFirst
      \lst@ifprint \def\lst@next{\lst@get@filecontents{#1}}%
      \else        \let\lst@next\@empty
      \fi
      \lst@next
      \lst@DeInit
   \endgroup}
\newread\lst@inputfile
\def\lst@get@filecontents#1{%
   \let\lst@filecontents\@empty
   \openin\lst@inputfile=#1\relax
   \let\@lst@get@filecontents@prevline\relax
   \lst@get@filecontents@loop
   \closein\lst@inputfile
   \lst@filecontents\empty}
\def\lst@get@filecontents@loop{%
   \read\lst@inputfile to\lst@temp
   \let\lst@arg\@empty\expandafter\expandafter\expandafter\lst@InsideConvert\expandafter{\lst@temp}%
   \ifx\@lst@get@filecontents@prevline\relax\else
      \expandafter\expandafter\expandafter\def
      \expandafter\expandafter\expandafter\lst@filecontents
      \expandafter\expandafter\expandafter{%
         \expandafter\lst@filecontents\@lst@get@filecontents@prevline}%
   \fi
   \let\@lst@get@filecontents@prevline\lst@arg
   \ifeof\lst@inputfile\else
      \expandafter\lst@get@filecontents@loop
   \fi}

%%%%%%%% escape to \LaTeX
%%%% 一旦中身を全部取得した後で，^^@ ( = \ltj@lst@ProcessJALetter) を
%%%% トークン列から削除，その後 \scantokens で再読み込み
\lstloadaspects{escape}
\gdef\lst@Escape#1#2#3#4{%
    \lst@CArgX #1\relax\lst@CDefX
        {}%
        {\lst@ifdropinput\else
         \lst@TrackNewLines\lst@OutputLostSpace \lst@XPrintToken
         \lst@InterruptModes
         \lst@EnterMode{\lst@TeXmode}{\lst@modetrue}%
         \ifx\^^M#2%
             \lst@CArg #2\relax\lst@ActiveCDefX
                 {}%
                 {\lst@escapeend #4\lst@LeaveAllModes\lst@ReenterModes}%
                 {\ltj@lst@MProcessListing}%
         \else
             \lst@CArg #2\relax\lst@ActiveCDefX
                 {}%
                 {\lst@escapeend #4\lst@LeaveAllModes\lst@ReenterModes
                  \lst@newlines\z@ \lst@whitespacefalse}%
                 {}%
         \fi%
         \ltj@lst@escape@setup#2%
         #3\lst@escapebegin\expandafter\lst@next%
         \fi}%
	 {}}
\gdef\ltj@empty@grp{{}}
\gdef\ltj@lst@escape@setup#1{%
  \begingroup\lccode`\~=`#1\lowercase{%
  \gdef\lst@next##1~{%
     \let\lst@arg\@empty\ltj@lst@remove@jacmd{##1}%
     \expandafter\expandafter\expandafter\expandafter\expandafter\expandafter\expandafter
	 \scantokens\expandafter\expandafter\expandafter{\expandafter\ltj@empty@grp\lst@arg\empty}%
     ~}%
  }\endgroup
}

\begingroup
  \catcode`\^^@=12 %
  \gdef\ltj@lst@remove@jacmd#1{%
    \expandafter\ltj@lst@remove@jacmd@\detokenize{#1}^^@\@nil^^@}
  \gdef\ltj@lst@remove@jacmd@#1^^@{%
    \ifx#1\@nil\else
       \lst@lAddTo\lst@arg{#1}%
       \expandafter\ltj@lst@remove@jacmd@
    \fi}
\endgroup

%%%%%%%%%%%%%%%% texcl
{\lccode`\~=`\%\lccode`\|=`\^^M \catcode`\|=13\relax
  \lowercase{%
	\gdef\plst@texcl@comment#1|{}%
	\gdef\plst@texcl@setchar{\catcode`\%=\active \let~\plst@texcl@comment}%
  }%
}
\lst@AddToHook{AfterBeginComment}{%
  \ifnum\lst@mode=\lst@TeXLmode
    \catcode`\^^M=13\relax \catcode`\^^@=9\relax\plst@texcl@setchar
  \fi}


%%%%%%%%%%%%%%%% \lstMakeShortInline
\patchcmd\lstMakeShortInline@{\lst@shortinlinedef#1}{\lst@shortinlinedef~}{}{}

\endinput