% \iffalse meta-comment
%
% File: enverb.dtx Copyright (C) 2023-2024 Jonathan P. Spratte
%
% This work  may be  distributed and/or  modified under  the conditions  of the
% LaTeX Project Public License (LPPL),  either version 1.3c  of this license or
% (at your option) any later version.  The latest version of this license is in
% the file:
%
%   http://www.latex-project.org/lppl.txt
%
% ------------------------------------------------------------------------------
%
%<*driver>^^A>>=
\def\nameofplainTeX{plain}
\ifx\fmtname\nameofplainTeX\else
  \expandafter\begingroup
\fi
\input l3docstrip.tex
\askforoverwritefalse
\preamble

--------------------------------------------------------------
enverb -- read an environment verbatim
E-mail: jspratte@yahoo.de
Released under the LaTeX Project Public License v1.3c or later
See http://www.latex-project.org/lppl.txt
--------------------------------------------------------------

Copyright (C) 2023-2024 Jonathan P. Spratte

This  work may be  distributed and/or  modified under  the conditions  of the
LaTeX Project Public License (LPPL),  either version 1.3c  of this license or
(at your option) any later version.  The latest version of this license is in
the file:

  http://www.latex-project.org/lppl.txt

This work is "maintained" (as per LPPL maintenance status) by
  Jonathan P. Spratte.

This work consists of the files  enverb.dtx
                                 enverb-doc.tex
and the derived files            enverb-doc.pdf
                                 enverb.sty

\endpreamble
\postamble
\endpostamble
\generate{\file{enverb.sty}{\from{enverb.dtx}{pkg}}}
\ifx\fmtname\nameofplainTeX
  \expandafter\endbatchfile
\else
  \expandafter\endgroup
\fi
%</driver>^^A=<<
% \fi
%
% \gobbledocstriptag
%<*pkg>
%
% \subsection{Who we are}
%
% \begin{macro}[internal]{\enverb@date,\enverb@version}
%   We store the package version and date inside macros.
%    \begin{macrocode}
\newcommand*\enverb@date{2024-08-28}
\newcommand*\enverb@version{1.0}
%    \end{macrocode}
% \end{macro}
%
% And the package identification:
%    \begin{macrocode}
\ProvidesPackage{enverb}
  [\enverb@date\space v\enverb@version\space read an environment verbatim]
%    \end{macrocode}
%
% \subsection{Some required \LaTeXe\ style argument grabbers}
% \begin{macro}[internal]{\@thirdofthree,\@firstofnine}
%   This here are just two argument grabbers that aren't defined in all versions
%   of \LaTeXe.
%    \begin{macrocode}
\providecommand\@thirdofthree[3]{#3}
\providecommand\@firstofnine[9]{#1}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Borrow some code}
% \begin{macro}[internal]
%   {\enverb@count,\enverb@ifxTF,\enverb@chargen,\enverb@othercr}
%   We'll make use of the following two \pkg{expl3} functions, but since the
%   remainder of this package is coded in \LaTeXe\ style we stick to that.
%    \begin{macrocode}
\ExplSyntaxOn
\cs_new_eq:NN \enverb@count \tl_count:n
\cs_new_eq:NN \enverb@ifxTF \token_if_eq_meaning:NNTF
\cs_new_eq:NN \enverb@chargen \char_generate:nn
\cs_set:Npx \enverb@othercr { \char_generate:nn {13} {12} }
\ExplSyntaxOff
%    \end{macrocode}
% \end{macro}
%
% \subsection{Key-value Setup}
% First we need to load a package to allow us defining our keys, then we define
% a bunch of keys:
%    \begin{macrocode}
\RequirePackage{expkv-def}
%    \end{macrocode}
%
%    \begin{macrocode}
\ekvdefinekeys{enverb}
  {
     protect code  ignore      = \let\enverb@ifautoignore\@secondoftwo
    ,also    eint  ignore      = \enverb@ignore
    ,boolTF        auto-ignore = \enverb@ifautoignore
    ,initial       auto-ignore
    ,eint          more-ignore = \enverb@moreignore
    ,initial       more-ignore = 2
    ,long store    bol         = \enverb@bol@content
    ,long code     bol+        = \enverb@add\enverb@bol@content{#1}
    ,long code     +bol        = \enverb@pre\enverb@bol@content{#1}
    ,long store    eol         = \enverb@eol@content
    ,einitial      eol         = \enverb@othercr
    ,long code     eol+        = \enverb@add\enverb@eol@content{#1}
    ,long code     +eol        = \enverb@pre\enverb@eol@content{#1}
    ,protect code  key-handler = \protected\long\def\enverb@keyhandler##1{#1}
    ,protect code  key-set     = \protected\long\ekvsetdef\enverb@keyhandler{#1}
    ,unknown code              = \enverb@add\enverb@unknown@kv{, {#3} = {#2} }
    ,unknown noval             = \enverb@add\enverb@unknown@kv{, {#2} }
    ,boolTF        oarg-not-enverb = \enverb@ifoargtokeyhandler
  }
%    \end{macrocode}
% \begin{macro}{\enverbsetup}
%   We need a user facing macro to set our keys.
%    \begin{macrocode}
\protected\long\ekvsetdef\enverbsetup{enverb}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@unknown@kv}
%   This is a storage for all unknown keys encountered.
%    \begin{macrocode}
\let\enverb@unknown@kv\@empty
%    \end{macrocode}
% \end{macro}
%
% \subsection{Miscellaneous Auxiliary Functions}
%
% \begin{macro}[internal]{\enverb@stop}
%   A very simple minded stop-macro, just gobble up to the eponymous mark.
%    \begin{macrocode}
\long\def\enverb@stop#1\enverb@stop{}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@error}
%    \begin{macrocode}
\protected\def\enverb@error{\PackageError{enverb}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@misused}
%   This is an error message that'd be used inside a |\lowercase| environment if
%   put where it originally should've been. Hence we define it now to get
%   correct formatting.
%    \begin{macrocode}
\protected\def\enverb@misused
  {%
    \enverb@error
      {Misused \string\enverb. Input already tokenised}%
      {%
        It seems you used the \string\enverb\space based environment
        {\@currenvir} inside another\MessageBreak
        macro's or a primitive's argument; that doesn't work.%
      }%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@keyhandler, \enverb@keyhandler@}
%   This is the initial definition of the handler for unknown keys, namely throw
%   an error containing the list of unknown keys.
%    \begin{macrocode}
\protected\long\def\enverb@keyhandler#1%
  {%
    \if\relax\detokenize{#1}\relax
      \expandafter\@gobbletwo
    \fi
    \@firstofone
      {%
        \enverb@error
          {%
            Unknown keys encountered:
            \expanded
              {%
                \ekvparse
                  {\MessageBreak\@spaces\unexpanded}%
                  {\MessageBreak\@spaces\enverb@keyhandler@}%
                  {#1}%
              }%
            \@gobble
          }%
          {%
            Perhaps you misspelled some key names? Or you forgot to set up
            custom key\MessageBreak
            parsing.%
          }%
      }%
  }
\long\def\enverb@keyhandler@#1{\unexpanded{#1} = \unexpanded}
%    \end{macrocode}
% \end{macro}
%
% \subsection{Collector}
%
% Much of the code in this package works under a weird category code regime,
% which the following sets up. After this |~| will be an active newline
% character, |:| will be an active space, and |;| will be an active tab.
%    \begin{macrocode}
\begingroup
\lccode`\~=`\^^M
\catcode`\:=13
\lccode`\:=`\ % <- space
\catcode`\;=13
\lccode`\;=`\^^I % <- tab
\lowercase{\endgroup
%    \end{macrocode}
%
% \begin{macro}[internal]
%   {\enverb@body@space,\enverb@body@tab,\enverb@body@newline,\enverb@collect}
%   To quickly check whether a line contains only spaces or tabs we define them
%   as empty, that way we can remove them simply by one step of |\romannumeral|
%   expansion. The newlines on the other hand grab the entire next line, check
%   whether the matching |\end| is encountered, and if not leave the contents
%   in |\unexpanded|. This grabbing is not done by the newline characters
%   directly, but instead via |\enverb@collect| so that low level errors are
%   easier to understand.
%    \begin{macrocode}
\def\enverb@body@space{}
\def\enverb@body@tab{}
\def\enverb@body@newline{\enverb@collect}
\def\enverb@collect#1~%
  {\enverb@ifnotend{#1}{\enverb@bol\unexpanded{#1}\enverb@eol\enverb@collect}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\enverbBody}
% \begin{macro}[internal]{\enverb@body@setup}
%   This function sets up the entire category code regime and initial
%   assignments of special tokens.
%    \begin{macrocode}
\protected\def\enverb@body@setup
  {%
    \let\enverbBody\@empty
    \let\do\@makeother\dospecials
    \endlinechar=`\^^M
    \catcode`\^^M=13 \let~\enverb@body@newline
    \catcode`\   =13 \let:\enverb@body@space
    \catcode`\^^I=13 \let;\enverb@body@tab
    \let\enverb@bol\relax
    \let\enverb@eol\relax
  }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}[internal]
%   {
%     \enverb@ifxanyTF,   \enverb@ifxanyTF@, \enverb@ifxanyTF@ifdone,
%     \enverb@ifxanyTF@F, \enverb@ifxanyTF@T
%   }
%   This function provides a loop to check a list of symbols whether any of them
%   matches the meaning of the first argument.
%    \begin{macrocode}
\long\def\enverb@ifxanyTF#1#2%
  {\enverb@ifxanyTF@#1#2\enverb@ifxanyTF@}
\long\def\enverb@ifxanyTF@#1#2%
  {%
    \enverb@ifxanyTF@ifdone#2\enverb@ifxanyTF@F\enverb@ifxanyTF@
    \enverb@ifxTF#1#2\enverb@ifxanyTF@T{\enverb@ifxanyTF@#1}%
  }
\long\def\enverb@ifxanyTF@ifdone#1\enverb@ifxanyTF@{}
\long\def\enverb@ifxanyTF@F
    \enverb@ifxanyTF@\enverb@ifxTF#1\enverb@ifxanyTF@T#2#3#4%
  {#4}
\long\def\enverb@ifxanyTF@T#1\enverb@ifxanyTF@#2#3{#2}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@search@oarg@a, \enverb@search@oarg@ifx}
%   This function shall search for the optional argument. The first case is
%   rather easy, namely we check for a space (remember that |:| is an active
%   space character in the current context). If this isn't the first line (so
%   the line containing the |\begin| statement) that space is added to the body
%   and searching continues.\par
%   Next repeat the same logic but for an active tab (|;|). Afterwards we check
%   for an active newline (|~|) which if found sets the conditional for the
%   first line to false, still applying the same logic otherwise.\par
%   Lastly we check for the open bracket. If it's found we collect our optional
%   argument, otherwise the body starts, which is either an illegal character
%   immediately following the |\begin| line, or we normally collect the body.
%   
%    \begin{macrocode}
\def\enverb@search@oarg@ifx#1#2%
  {%
    \enverb@ifxTF#1\@let@token
      {%
        \ifenverb@firsteol#2\else\enverb@body@add{#1}\fi
        \enverb@search@oarg@b
      }%
  }
\protected\def\enverb@search@oarg@a
  {%
    \enverb@search@oarg@ifx:{}%
      {%
        \enverb@search@oarg@ifx;{}%
          {%
            \enverb@search@oarg@ifx~\enverb@firsteolfalse
              {%
                \enverb@ifxTF{[}\@let@token
                  {\enverb@oarg}%
                  {%
                    \enverb@ifxanyTF\@let@token
                      {%
                        \@sptoken\par\bgroup\egroup$&##^_% $
                      }
                      {%
                        \enverb@misused
                        \endgroup
                      }%
                      {%
                        \ifenverb@firsteol
                          \expandafter\enverb@body@after@begin
                        \else
                          \expandafter\enverb@body
                        \fi
                      }%
                  }%
              }%
          }%
      }%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]
%   {\enverb@body, \enverb@body@after@oarg, \enverb@body@after@begin}
%   The body collection works by collecting everything inside a macro in one
%   sweep, and a second pass over the collected material to strip leading spaces
%   if the |ignore| or |auto-ignore| feature is used. This macro starts the
%   first sweep. Since during the collection of the optional argument we might
%   already have collected a few tokens we place those at the start by expanding
%   the current definition of |\enverbBody| once.
%    \begin{macrocode}
\protected\def\enverb@body
  {\edef\enverbBody{\iffalse}\fi\expandafter\enverb@collect\enverbBody}
%    \end{macrocode}
%   The other two macros also start collecting the body, but are only called
%   after either an optional argument was found, or if the first non-ignored
%   character of the optional argument search was encountered before the first
%   newline. In both cases we check whether the remainder of that line can be
%   considered blank, and if so collect the body.
%    \begin{macrocode}
\def\enverb@body@after@oarg#1~%
  {\enverb@ensure@blank{#1}{closing bracket}\enverb@body}
\def\enverb@body@after@begin#1~%
  {\enverb@ensure@blank{#1}{\string\begin}\enverb@body}
%    \end{macrocode}
%   This is also the last place we need the strange category setup in, so we
%   close the delimiting brace of the |\lowercase| above here.
%    \begin{macrocode}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@ensure@blank}
%   We actually need to define the check for an empty line. This check here
%   works for our specifically set up regime of spaces and tabs (which both
%   expand to nothing, the same trick is basically used twice, though we once
%   fully expand and once use romannumeral-expansion).
%    \begin{macrocode}
\newcommand\enverb@ensure@blank[2]
  {%
    \expandafter\enverb@ifempty\expanded{{#1}}{}%
      {%
        \expanded
          {%
            \noexpand\enverb@error
              {%
                Line after #2 not empty.\noexpand\MessageBreak
                Contains: \detokenize\expandafter{\romannumeral`\^^@#1}%
              }%
              {%
                \noexpand\enverb will try to ignore this. You should clean up
                your input.%
              }%
          }%
      }%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]
%   {\enverb@ifempty,\enverb@ifempty@,\enverb@ifempty@true}
%   This is just a quick argument-grabbing based test for an empty argument.
%    \begin{macrocode}
\newcommand\enverb@ifempty[1]
  {%
    \enverb@ifempty@\enverb@ifempty@A#1\enverb@ifempty@B.\enverb@ifempty@true
      \enverb@ifempty@A\enverb@ifempty@B
  }
\def\enverb@ifempty@#1\enverb@ifempty@A\enverb@ifempty@B#2#3{#3}
\def\enverb@ifempty@true\enverb@ifempty@A\enverb@ifempty@B#1#2{#1}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@add,\enverb@pre,\enverb@body@add}
%   These are just two functions to add things to a token list storing macro,
%   one is available for arbitrary contents, the other is used for the |body|.
%    \begin{macrocode}
\protected\long\def\enverb@add#1#2{\edef#1{\unexpanded\expandafter{#1#2}}}
\protected\long\def\enverb@pre#1#2%
  {\edef#1{\unexpanded{#2}\unexpanded\expandafter{#1}}}
\protected\def\enverb@body@add{\enverb@add\enverbBody}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\enverb}
%   This macro is the front facing command that starts the entire grabbing
%   logic. The first thing we need to do is define the auxiliary we use to check
%   whether we're done collecting the body, which is dependent on the current
%   environment's name. Next we store the mandatory argument in |marg| and
%   initialise the |oarg|-storage, category regime, and |firsteol|-boolean.
%   Finally we start searching for the optional argument.
%    \begin{macrocode}
\NewDocumentCommand \enverb { s +m }
  {%
    \expandafter\enverb@ifnotend@setup@perhaps\expanded
      {{\string{\@currenvir\string}}}%
    \let\enverb@collected@oarg\@empty
    \edef\enverb@collected@marg{\unexpanded{#2}}%
    \begingroup
    \enverb@body@setup
    \IfBooleanTF{#1}%
      {\enverb@body@after@begin}%
      {%
        \enverb@firsteoltrue
        \enverb@search@oarg
      }%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]
%   {\ifenverb@firsteol,\enverb@firsteoltrue,\enverb@firsteolfalse}
%   A simple \TeX-style boolean to keep track whether we're in front of the
%   first newline.
%    \begin{macrocode}
\newif\ifenverb@firsteol
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@search@oarg, \enverb@search@oarg@b}
%   The core function to search for an optional argument was already defined
%   above, these are the first and third step of that functionality (starting
%   and resuming to search).
%    \begin{macrocode}
\protected\def\enverb@search@oarg{\futurelet\@let@token\enverb@search@oarg@a}
\protected\def\enverb@search@oarg@b{\expandafter\enverb@search@oarg\@gobble}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@oarg, \enverb@oarg@}
%   This is used once the opening brace of the optional argument is found. First
%   we close the group in which the body's category code regime is active, then
%   we actually collect the optional argument with the normal category codes,
%   restore the body's regime and collect it.
%    \begin{macrocode}
\protected\def\enverb@oarg{\endgroup\enverb@oarg@}
\NewDocumentCommand\enverb@oarg@{+O{}}
  {%
    \enverb@add\enverb@collected@oarg{#1}%
    \begingroup
    \enverb@body@setup
    \enverb@body@after@oarg
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@ifnotend, \enverb@ifnotend}
%   These functions check whether the input contains the string representation
%   |\end|. If it does they invoke \cs[no-index]{enverb@ifnotend@maybe} with the
%   tokens in front of |\end| and after it as two arguments. Otherwise the third
%   argument after \cs{enverb@ifnotend@}'s expansion is directly used, which is
%   the second (curried) argument to \cs{enverb@ifnotend}.
%    \begin{macrocode}
\newcommand\enverb@ifnotend[1]%
  {%
    \def\enverb@ifnotend##1%
      {%
        \enverb@ifnotend@
          ##1\enverb@mark\enverb@ifnotend@maybe
          #1\enverb@mark\@thirdofthree
          \enverb@stop
      }%
    \def\enverb@ifnotend@##1#1##2\enverb@mark##3##4\enverb@stop{##3{##1}{##2}}%
  }
\expandafter\enverb@ifnotend\expanded{{\expandafter\@gobble\string\\end}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@ifnotend@maybe}
%   This function will be used if an |\end| was encountered and should check
%   whether that is indeed the end of our environment, it uses a second stage
%   \cs[no-index]{enverb@ifnotend@perhaps} for that check. The |\romannumeral|
%   expansion it employs will strip any leading spaces or tabs from |#2|.
%    \begin{macrocode}
\newcommand\enverb@ifnotend@maybe[2]
  {\expandafter\enverb@ifnotend@perhaps\expandafter{\romannumeral`\^^@#2}{#1}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]
%   {
%     \enverb@ifnotend@setup@perhaps,
%     \enverb@ifnotend@perhaps, \enverb@ifnotend@perhaps@,
%     \@thirdofthree
%   }
%   We need an expandable and fast check to see whether some input really
%   contains the |\end| of our environment. Checking for |\end| itself is
%   already done above, we need to check for the correct argument to it. The
%   following does so by argument grabbing logic.
%    \begin{macrocode}
\protected\def\enverb@ifnotend@setup@perhaps#1%
  {%
    \def\enverb@ifnotend@perhaps##1%
      {%
        \enverb@ifnotend@perhaps@\enverb@mark##1\enverb@mark\enverb@ifnotend@end
          \enverb@mark#1\enverb@mark\@thirdofthree
          \enverb@stop
      }%
    \def\enverb@ifnotend@perhaps@
        ##1\enverb@mark#1##2\enverb@mark##3##4\enverb@stop
      {##3{##2}}%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@ifnotend@end}
%   If the correct |\end| statement was found this function will be called by
%   \cs[no-index]{enverb@ifnotend@perhaps}. It's first argument will be anything
%   in that line following the |\end| statement, the second argument will be the
%   material in front of it. And |#3| will be whatever the argument to
%   \cs[no-index]{enverb@ifnotend} was.
%
%   The first thing we need to do is end the body collection by placing the
%   matching closing brace. After that we throw an error on lost content after
%   the |\end| if it's non-blank. And finally we need to smuggle the collected
%   body outside the current group's scope.
%    \begin{macrocode}
\def\enverb@ifnotend@end#1#2#3%
  {%
    \iffalse{\fi}%
    \enverb@ensure@blank{#1}{\string\end}%
    \expandafter\enverb@finalise\expandafter{\enverbBody}{#2}%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@finalise}
%   The finalising function closes the group containing the body's catcode
%   regime. The already tokenised body is |#1|, and |#2| is the contents found
%   in front of the |\end| statement, which we might use for the auto-ignore
%   feature.
%
%   It then does the key=val parsing, sets up the aftertreatment and assigns the
%   final meaning to \cs{enverbBody}. Eventually it calls the end code of the
%   enclosing environment.
%    \begin{macrocode}
\protected\def\enverb@finalise#1#2%
  {%
    \endgroup
    \expandafter\enverbsetup\expandafter{\enverb@collected@marg}%
    \enverb@ifoargtokeyhandler
      {%
        \expandafter\enverb@keyhandler\expanded
          {{%
            \unexpanded\expandafter{\enverb@unknown@kv},%
            \unexpanded\expandafter{\enverb@collected@oarg}%
          }}%
      }%
      {%
        \expandafter\enverbsetup\expandafter{\enverb@collected@oarg}%
        \expandafter\enverb@keyhandler\expandafter{\enverb@unknown@kv}%
      }%
    \enverb@ifautoignore
      {\enverb@setup@ignore{\enverb@count{#2}+\enverb@moreignore}}%
      {\enverb@setup@ignore\enverb@ignore}%
    \edef\enverb@line##1\enverb@eol
      {%
        \noexpand\unexpanded{##1}%
        %\noexpand\detokenize{##1}% % TODO
        \noexpand\unexpanded{\unexpanded\expandafter{\enverb@eol@content}}%
      }%
    \edef\enverbBody{#1}%
    \expandafter\end\expandafter{\@currenvir}%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}[internal]{\enverb@setup@ignore, \enverb@setup@ignore@}
%    \begin{macrocode}
\protected\def\enverb@setup@ignore#1%
  {\expandafter\enverb@setup@ignore@\the\numexpr#1\relax;\enverb@line}
\protected\def\enverb@setup@ignore@#1;#2%
  {%
    \ifnum#1>9
      \expandafter\@firstoftwo
    \else
      \expandafter\@secondoftwo
    \fi
    {\expandafter\enverb@setup@ignore@\the\numexpr#1-8;{\@firstofnine{#2}}}%
%    \end{macrocode}
%   Just to make sure that |\renewcommand| works correctly, we ensure the macro
%   exists.
%    \begin{macrocode}
    {%
      \let\enverb@bol@gobble\@empty
      \expanded
        {%
          \unexpanded{\renewcommand\enverb@bol@gobble}\ifnum#1>\z@[#1]\fi
            {\unexpanded{#2}}%
          \unexpanded{\def\enverb@bol##1\enverb@eol}%
            {%
              \noexpand\unexpanded
                {\unexpanded\expandafter{\enverb@bol@content}}%
              \unexpanded{\expandafter\enverb@ifempty\expanded}{{##1}}%
                {\noexpand\enverb@line}%
                {\noexpand\enverb@bol@gobble}%
              ##1\noexpand\enverb@eol
            }%
        }%
    }%
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Output Oriented Macros}
%
% \begin{macro}[internal]{\enverb@rmeol, \enverb@rmeol@}
%   Many of our output routines require the |\scantokens| primitive. Since that
%   one places an additional end of line at the end of its argument we need a
%   way to remove it (this usually results in an additional space in the output
%   otherwise). For that we place a comment character at the end of the input
%   (if it's possible), if that's not available we hope that a stringified
%   |\relax| will do. The code here will use \pkg{expl3} for ease of coding.
%    \begin{macrocode}
\def\enverb@rmeol
  {%
    \ifnum\catcode`\%=14
      \enverb@chargen{`\%}{12}%
      \expandafter\enverb@stop
    \fi
    \enverb@rmeol@0;%
    \enverb@stop
  }
\def\enverb@rmeol@#1;%
  {%
    \ifnum#1=128
      \string\relax
      \expandafter\enverb@stop
    \fi
    \@firstofone
      {%
        \ifnum\catcode`\%=14
          \enverb@chargen{#1}{12}%
          \expandafter\enverb@stop
        \fi
        \expandafter\enverb@rmeol@\the\numexpr#1+1;%
      }%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\enverbExecute}
%    \begin{macrocode}
\NewDocumentCommand\enverbExecute{}
  {%
    \begingroup
      \newlinechar=`\^^M
      \expandafter
    \endgroup
    \scantokens\expanded
      {{%
        \detokenize\expandafter{\enverbBody}%
        \enverb@rmeol
      }}%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\enverbListing}
% \begin{macro}[internal]{\enverbListing@}
%    \begin{macrocode}
\NewDocumentCommand \enverbListing { m m }
  {%
    \scantokens\expanded
      {{%
        \string\begin{#1}\detokenize{#2}\enverb@othercr
          \detokenize\expandafter{\enverbBody}%
        \string\end{#1}\enverb@othercr
        \enverb@rmeol
      }}%
  }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \gobbledocstriptag
%</pkg>