/usr/share/texmf-texlive/tex/generic/genmisc/verbatim.tex is in texlive-generic-recommended 2009-15.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 | \catcode `\@ = 11 %%% we use commercial-at as a letter throughout;
\chardef \l@tter = 11 %%% and introduce synonyms for the \catcodes for
\chardef \@ther = 12 %%% <letter> and <other>;
\newcount \c@unt %%% a loop-counter;
\newcount \ch@rcode %%% this will hold the character-code of the
%%% escape character;
\newif \ifd@bugging %%% set <true> if you want to watch the
%%% finite-state automaton at work;
\newif \ifshewleadingspaces %%% set <true> if you want to see leading spaces
%%% shewn as inverted square cup (explicit);
\newif \ifshewembeddedspaces %%% set <false> if you want to see embedded
\shewembeddedspacestrue %%% spaces shewn as white space (implicit);
\ifd@bugging %%% if <debugging>,
\let \m@ssage = \message %%% \m@ssage is synonymous with \message
\else %%% otherwise
\def \m@ssage #1{}% %%% it simply throws its parameter away;
\fi
%
\def \verbatim %%% the \verbatim macro takes no parameter
{\begingroup %%% and immediately starts a nested group
\tracingonline = 0
\def \n@sted %%% within which \n@sted is defined
{\begingroup %%% to start a further group within which
\let \n@sted %%% \n@sted becomes a synonym for \endgroup
= \endgroup
\@nvironment %%% and the environment is restored to that
%%% which obtained two levels of nesting out;
\ignorespaces %%% for tidyness, we ignore any <lwsp>
}% %%% which follows the escape character;
\edef \@nvironment %%% we initialise \@nvironment
{\the \font %%% who forgot this ?????
\parindent = %%% to prepare to restore \parindent
\the \parindent
\parskip = %%% and \parskip;
\the \parskip
\space %%% and ensure that the value to be assigned to
}% %%% \parskip is properly terminated;
\displayverbatimfont %%% we assume Knuth's font-selectors and
%%% select the `typewriter' font;
\parskip = 0 pt %%% we then set \parindent and
\parindent = 0 pt %%% \parskip to 0 pt;
\c@unt = 0 %%% and initialise \count to 0;
\loop %%% this loop checks the \catcode of each
%%% character code in the range 0 .. 127
%%% (or 0 .. 255 for TeX V3) and if it
%%% is other than <letter> or <other>, as
%%% appropriate, saves the current value in
%%% \@nvironment for subsequent restoration
%%% within an inner group; it then sets the
%%% \catcode to either <letter> or <other>;
\ifnum \c@unt < `\A
\s@ve \catcode \c@unt = \@ther
\else \ifnum \c@unt > `\z
\s@ve \catcode \c@unt = \@ther
\else \ifnum \c@unt > `\Z
\ifnum \c@unt < `\a
\s@ve \catcode \c@unt = \@ther
\else \s@ve \catcode \c@unt = \l@tter
\fi
\else \s@ve \catcode \c@unt = \l@tter
\fi
\fi
\fi
\advance \c@unt by 1
\ifnum \c@unt < 256 % or 128 for the V2 sites ...
\repeat
\v@rbatim
}
%
\def \v@rbatim #1% %%%
{\if #1 %%%
\let \n@xt = \v@rb@tim %%%
\else %%%
\def \n@xt %%%
{\v@rb@tim #1}% %%%
\fi %%%
\n@xt %%%
} %%%
%
\def \v@rb@tim #1%
{\ch@rcode = `#1 %%%
\edef \@nvironment %%% and append code to \@nvironment
{\@nvironment %%% to make the escape character active;
\catcode \the \ch@rcode
= \active
\space %%% <space> separates list items in \@nvironment
}%
\catcode \ch@rcode %%% the escape character is made active;
= \active
\uccode `\^^M = \ch@rcode %%% and the upper-case code of <return> is made
%%% equal to the character-code of the escape
%%% character; this is necessary because only
%%% <return> can be guaranteed to be active at
%%% this point, and we need an active character
%%% to form the primary operand of \def;
%%% the \@x's below are \expandafter's,
%%% and the effect is to upper-case <return>
%%% (yielding the escape character), then \def
%%% (an active instance of) this character as
%%% \n@sted, which has been defined above;
%
\@x \uppercase \@x {\@x \def \r@turn {\n@sted}}%
%
\uccode `\^^M = 0 %%% the upper-case code of <return> is then re-
%%% instated (not strictly true; it is set to 0,
%%% which is assumed to be its previous value
%%% --- could be improved here);
\@ctivecr %%% <return> is made active;
\@ctivespace %%% and so is <space> (to avoid space-elision);
%%% finally, the finite-state automaton which
}% %%% processes <space>s is set to <????>;
%%% this ends the definition of \verbatim.
%
\def \s@ve #1#2=#3% %%% \s@ve minimises the \catcode restoration
{\ifnum #1#2 = #3% %%% work of \@nvironment by saving only the
%%% \catcode of characters whose \catcode
%%% is to be changed; it then changes the
%%% \catcode of those characters.
\else \edef \@nvironment
{\@nvironment #1\the #2=\the #1#2 }%
#1#2 = #3%
\fi
}%
%%% the code which follows implements the finite
%%% state automaton which determines whether
%%% <space>s are ignored, shewn explicitly or
%%% implied, and which ensures that blank
%%% lines are reproduced correctly.
%
\def \v@id {\futurelet \n@xt \v@idifspace}%
\def \l@ad {\l@adingspace \futurelet \n@xt \l@adifspace}%
\def \sk@p {\vskip \baselineskip \futurelet \n@xt \l@adifspace}%
\def \emb@d {\emb@ddedspace}%
\def \sh@wspace {\char 32\relax}%
\def \h@despace {\leavevmode \kern \fontdimen 2 \font}%
\def \l@adingspace {\ifshewleadingspaces \sh@wspace \else \h@despace \fi}%
\def \emb@ddedspace {\ifshewembeddedspaces \sh@wspace \else \h@despace \fi}%
\def \v@idifspace {\testn@xt {\afterassignment \v@id}}%
\def \l@adifspace {\testn@xt {\afterassignment \sk@p}}%
%
%%% \testn@xt provides a common look-ahead for
%%% \v@idifspace and \l@adifspace, and also
\def \testn@xt #1% %%% implements some essential debugging hooks.
{\ifx \n@xt \sp@c@
\m@ssage {Next character is a space}%
\let \n@xt = \relax
\else \ifx \n@xt \r@t@rn
\m@ssage {Next character is a return}%
\def \n@xt {#1\let \n@xt = }%
\else \m@ssage {Next character is \meaning \n@xt}%
\let \n@xt = \relax
\@x \let \sp@ce = \emb@d
\fi
\fi
\n@xt
}%
%
%%% We next tamper with the \catcode of <space>
%%% and <return>, while defining macros and
%%% synonyms which require them to be active;
%%% the \catcode is then restored to its default
%%% (not necessarily the previous value ---
%%% could be improved). \@ctivespace makes
%%% <space> active, then defines <space> as
\catcode `\ = \active% %%% \v@id with a synonym \sp@c@. This code is
\def\sp@ce{ }% %%% used by the finite-state automaton.
\def\@ctivespace%
{\catcode`\ =\active\def {\v@id}\let\sp@c@= }\catcode`\ =10\relax%
\catcode`\ =10\relax%
%
\catcode `\^^M = \active % %%% <return> is made active;
\def \r@turn {^^M}% %%% \r@turn defined as an active <return>;
\let \r@t@rn = ^^M% %%% \r@t@rn is made a synonym;
\def \@ctivecr % %%% and \@ctivecr is defined to
{\catcode `\^^M = \active % %%% make <return> active, then
\def ^^M% %%% define <return> to manipulate the
%%% finite-state automaton and ...
{\@x \def \sp@ce {\l@ad}%
\@x \let \@x \sp@c@ \@x =\sp@ce %
%
\endgraf % %%% insert a \par primitive (for blank lines).
%
\futurelet \n@xt \l@adifspace %
}%
\let \r@t@rn = ^^M% %%% \r@t@rn is synonymous with active <return>
}%
\catcode `\^^M = 5 % %%% finally, the \catcode of <return> is
%%% restored to its normal value;
%
%%% the \AfterGroup macro is intended for
%%% use within a nested normal environment,
%%% and causes (a concealed macro defined as)
%%% its parameter text to be inserted into
%%% TeX's input stream when the nested normal
%%% group terminates.
%
\def \AfterGroup #1{\global \def \@ftergroup {#1}\aftergroup \@ftergroup}%
%
\let \@x = \expandafter %%% \@x is a brief synonym for \expandafter;
%
%
\def \mitabrev %%% and \mitabrev defined as the closure for
{\endgroup \endgroup}% %%% \verbatim; any other name could be used,
%%% as the code performs no look-ahead for
%%% any particular string.
%
%%% Finally we announce to the world that we
%%% have been loaded, and gives some clues as
%%% to the usage.
%
\catcode `\Ý = \active
\catcode `\| = \active
\def Ý{\begingroup
\def \s@lidus ##1Ý{\inlineverbatimfont ##1\endgroup}%
\p@ssivate \activesp@ces \s@lidus
}
\def |{\begingroup
\def \s@lidus ##1|{\inlineverbatimfont ##1\endgroup}%
\p@ssivate \activesp@ces \s@lidus
}
\def \p@ssivate
{\tracingonline = 0
\c@unt = 0
\loop
\ifnum \catcode \c@unt = 11 {}%
\else \ifnum \catcode \c@unt = 12 {}%
\else \catcode \c@unt = 12
\fi
\fi
\ifnum
\c@unt < 255
\advance \c@unt by 1
\repeat
\catcode `\Ý = \active
\catcode `\| = \active
}
\begingroup
\catcode `\ = \active\gdef\activesp@ce{\def {\phantom{\char`\ }}}%
\endgroup
\def \activesp@ces {\catcode `\ = \active \activesp@ce}
\catcode `\@ = \@ther %%% commercial-at is restored to its normal
%%% <other> catcode (not necessarily the
%%% previous value --- could be improved);
\message {Verbatim environment loaded;}%
\message {usage: ``\noexpand \verbatim <char> ... <char> \noexpand \mitabrev''}%
\message {less functional short forms: \string Ý...\string Ý &
\string |...\string |}%
%%% ======================================================================== %%%
|