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| -rw-r--r-- | texinfo.tex | 701 |
1 files changed, 355 insertions, 346 deletions
diff --git a/texinfo.tex b/texinfo.tex index 6baddea..0481145 100644 --- a/texinfo.tex +++ b/texinfo.tex @@ -3,7 +3,7 @@ % Load plain if necessary, i.e., if running under initex. \expandafter\ifx\csname fmtname\endcsname\relax\input plain\fi % -\def\texinfoversion{1999-02-08}% +\def\texinfoversion{1999-02-09}% % % Copyright (C) 1985, 86, 88, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 % Free Software Foundation, Inc. @@ -738,351 +738,6 @@ where each line of input produces a line of output.} % @paragraphindent is defined for the Info formatting commands only. \let\paragraphindent=\comment -% Prevent errors for section commands. -% Used in @ignore and in failing conditionals. -\def\ignoresections{% -\let\chapter=\relax -\let\unnumbered=\relax -\let\top=\relax -\let\unnumberedsec=\relax -\let\unnumberedsection=\relax -\let\unnumberedsubsec=\relax -\let\unnumberedsubsection=\relax -\let\unnumberedsubsubsec=\relax -\let\unnumberedsubsubsection=\relax -\let\section=\relax -\let\subsec=\relax -\let\subsubsec=\relax -\let\subsection=\relax -\let\subsubsection=\relax -\let\appendix=\relax -\let\appendixsec=\relax -\let\appendixsection=\relax -\let\appendixsubsec=\relax -\let\appendixsubsection=\relax -\let\appendixsubsubsec=\relax -\let\appendixsubsubsection=\relax -\let\contents=\relax -\let\smallbook=\relax -\let\titlepage=\relax -} - -% Used in nested conditionals, where we have to parse the Texinfo source -% and so want to turn off most commands, in case they are used -% incorrectly. -% -\def\ignoremorecommands{% - \let\defcodeindex = \relax - \let\defcv = \relax - \let\deffn = \relax - \let\deffnx = \relax - \let\defindex = \relax - \let\defivar = \relax - \let\defmac = \relax - \let\defmethod = \relax - \let\defop = \relax - \let\defopt = \relax - \let\defspec = \relax - \let\deftp = \relax - \let\deftypefn = \relax - \let\deftypefun = \relax - \let\deftypevar = \relax - \let\deftypevr = \relax - \let\defun = \relax - \let\defvar = \relax - \let\defvr = \relax - \let\ref = \relax - \let\xref = \relax - \let\printindex = \relax - \let\pxref = \relax - \let\settitle = \relax - \let\setchapternewpage = \relax - \let\setchapterstyle = \relax - \let\everyheading = \relax - \let\evenheading = \relax - \let\oddheading = \relax - \let\everyfooting = \relax - \let\evenfooting = \relax - \let\oddfooting = \relax - \let\headings = \relax - \let\include = \relax - \let\lowersections = \relax - \let\down = \relax - \let\raisesections = \relax - \let\up = \relax - \let\set = \relax - \let\clear = \relax - \let\item = \relax -} - -% Ignore @ignore ... @end ignore. -% -\def\ignore{\doignore{ignore}} - -% Ignore @ifinfo, @ifhtml, @ifnottex, @html, @menu, and @direntry text. -% -\def\ifinfo{\doignore{ifinfo}} -\def\ifhtml{\doignore{ifhtml}} -\def\ifnottex{\doignore{ifnottex}} -\def\html{\doignore{html}} -\def\menu{\doignore{menu}} -\def\direntry{\doignore{direntry}} - -% @dircategory CATEGORY -- specify a category of the dir file -% which this file should belong to. Ignore this in TeX. -\let\dircategory = \comment - -% Ignore text until a line `@end #1'. -% -\def\doignore#1{\begingroup - % Don't complain about control sequences we have declared \outer. - \ignoresections - % - % Define a command to swallow text until we reach `@end #1'. - % This @ is a catcode 12 token (that is the normal catcode of @ in - % this texinfo.tex file). We change the catcode of @ below to match. - \long\def\doignoretext##1@end #1{\enddoignore}% - % - % Make sure that spaces turn into tokens that match what \doignoretext wants. - \catcode32 = 10 - % - % Ignore braces, too, so mismatched braces don't cause trouble. - \catcode`\{ = 9 - \catcode`\} = 9 - % - % We must not have @c interpreted as a control sequence. - \catcode`\@ = 12 - % - % Make the letter c a comment character so that the rest of the line - % will be ignored. This way, the document can have (for example) - % @c @end ifinfo - % and the @end ifinfo will be properly ignored. - % (We've just changed @ to catcode 12.) - \catcode`\c = 14 - % - % And now expand that command. - \doignoretext -} - -% What we do to finish off ignored text. -% -\def\enddoignore{\endgroup\ignorespaces}% - -\newif\ifwarnedobs\warnedobsfalse -\def\obstexwarn{% - \ifwarnedobs\relax\else - % We need to warn folks that they may have trouble with TeX 3.0. - % This uses \immediate\write16 rather than \message to get newlines. - \immediate\write16{} - \immediate\write16{WARNING: for users of Unix TeX 3.0!} - \immediate\write16{This manual trips a bug in TeX version 3.0 (tex hangs).} - \immediate\write16{If you are running another version of TeX, relax.} - \immediate\write16{If you are running Unix TeX 3.0, kill this TeX process.} - \immediate\write16{ Then upgrade your TeX installation if you can.} - \immediate\write16{ (See ftp://ftp.gnu.org/pub/gnu/TeX.README.)} - \immediate\write16{If you are stuck with version 3.0, run the} - \immediate\write16{ script ``tex3patch'' from the Texinfo distribution} - \immediate\write16{ to use a workaround.} - \immediate\write16{} - \global\warnedobstrue - \fi -} - -% **In TeX 3.0, setting text in \nullfont hangs tex. For a -% workaround (which requires the file ``dummy.tfm'' to be installed), -% uncomment the following line: -%%%%%\font\nullfont=dummy\let\obstexwarn=\relax - -% Ignore text, except that we keep track of conditional commands for -% purposes of nesting, up to an `@end #1' command. -% -\def\nestedignore#1{% - \obstexwarn - % We must actually expand the ignored text to look for the @end - % command, so that nested ignore constructs work. Thus, we put the - % text into a \vbox and then do nothing with the result. To minimize - % the change of memory overflow, we follow the approach outlined on - % page 401 of the TeXbook: make the current font be a dummy font. - % - \setbox0 = \vbox\bgroup - % Don't complain about control sequences we have declared \outer. - \ignoresections - % - % Define `@end #1' to end the box, which will in turn undefine the - % @end command again. - \expandafter\def\csname E#1\endcsname{\egroup\ignorespaces}% - % - % We are going to be parsing Texinfo commands. Most cause no - % trouble when they are used incorrectly, but some commands do - % complicated argument parsing or otherwise get confused, so we - % undefine them. - % - % We can't do anything about stray @-signs, unfortunately; - % they'll produce `undefined control sequence' errors. - \ignoremorecommands - % - % Set the current font to be \nullfont, a TeX primitive, and define - % all the font commands to also use \nullfont. We don't use - % dummy.tfm, as suggested in the TeXbook, because not all sites - % might have that installed. Therefore, math mode will still - % produce output, but that should be an extremely small amount of - % stuff compared to the main input. - % - \nullfont - \let\tenrm = \nullfont \let\tenit = \nullfont \let\tensl = \nullfont - \let\tenbf = \nullfont \let\tentt = \nullfont \let\smallcaps = \nullfont - \let\tensf = \nullfont - % Similarly for index fonts (mostly for their use in - % smallexample) - \let\indrm = \nullfont \let\indit = \nullfont \let\indsl = \nullfont - \let\indbf = \nullfont \let\indtt = \nullfont \let\indsc = \nullfont - \let\indsf = \nullfont - % - % Don't complain when characters are missing from the fonts. - \tracinglostchars = 0 - % - % Don't bother to do space factor calculations. - \frenchspacing - % - % Don't report underfull hboxes. - \hbadness = 10000 - % - % Do minimal line-breaking. - \pretolerance = 10000 - % - % Do not execute instructions in @tex - \def\tex{\doignore{tex}}% - % Do not execute macro definitions. - % `c' is a comment character, so the word `macro' will get cut off. - \def\macro{\doignore{ma}}% -} - -% @set VAR sets the variable VAR to an empty value. -% @set VAR REST-OF-LINE sets VAR to the value REST-OF-LINE. -% -% Since we want to separate VAR from REST-OF-LINE (which might be -% empty), we can't just use \parsearg; we have to insert a space of our -% own to delimit the rest of the line, and then take it out again if we -% didn't need it. Make sure the catcode of space is correct to avoid -% losing inside @example, for instance. -% -\def\set{\begingroup\catcode` =10 - \catcode`\-=12 \catcode`\_=12 % Allow - and _ in VAR. - \parsearg\setxxx} -\def\setxxx#1{\setyyy#1 \endsetyyy} -\def\setyyy#1 #2\endsetyyy{% - \def\temp{#2}% - \ifx\temp\empty \global\expandafter\let\csname SET#1\endcsname = \empty - \else \setzzz{#1}#2\endsetzzz % Remove the trailing space \setxxx inserted. - \fi - \endgroup -} -% Can't use \xdef to pre-expand #2 and save some time, since \temp or -% \next or other control sequences that we've defined might get us into -% an infinite loop. Consider `@set foo @cite{bar}'. -\def\setzzz#1#2 \endsetzzz{\expandafter\gdef\csname SET#1\endcsname{#2}} - -% @clear VAR clears (i.e., unsets) the variable VAR. -% -\def\clear{\parsearg\clearxxx} -\def\clearxxx#1{\global\expandafter\let\csname SET#1\endcsname=\relax} - -% @value{foo} gets the text saved in variable foo. -% -{ - \catcode`\_ = \active - % - % We might end up with active _ or - characters in the argument if - % we're called from @code, as @code{@value{foo-bar_}}. So \let any - % such active characters to their normal equivalents. - \gdef\value{\begingroup - \catcode`\-=12 \catcode`\_=12 - \indexbreaks \let_\normalunderscore - \valuexxx} -} -\def\valuexxx#1{\expandablevalue{#1}\endgroup} - -% We have this subroutine so that we can handle at least some @value's -% properly in indexes (we \let\value to this in \indexdummies). Ones -% whose names contain - or _ still won't work, but we can't do anything -% about that. The command has to be fully expandable, since the result -% winds up in the index file. This means that if the variable's value -% contains other Texinfo commands, it's almost certain it will fail -% (although perhaps we could fix that with sufficient work to do a -% one-level expansion on the result, instead of complete). -% -\def\expandablevalue#1{% - \expandafter\ifx\csname SET#1\endcsname\relax - {[No value for ``#1'']}% - \else - \csname SET#1\endcsname - \fi -} - -% @ifset VAR ... @end ifset reads the `...' iff VAR has been defined -% with @set. -% -\def\ifset{\parsearg\ifsetxxx} -\def\ifsetxxx #1{% - \expandafter\ifx\csname SET#1\endcsname\relax - \expandafter\ifsetfail - \else - \expandafter\ifsetsucceed - \fi -} -\def\ifsetsucceed{\conditionalsucceed{ifset}} -\def\ifsetfail{\nestedignore{ifset}} -\defineunmatchedend{ifset} - -% @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been -% defined with @set, or has been undefined with @clear. -% -\def\ifclear{\parsearg\ifclearxxx} -\def\ifclearxxx #1{% - \expandafter\ifx\csname SET#1\endcsname\relax - \expandafter\ifclearsucceed - \else - \expandafter\ifclearfail - \fi -} -\def\ifclearsucceed{\conditionalsucceed{ifclear}} -\def\ifclearfail{\nestedignore{ifclear}} -\defineunmatchedend{ifclear} - -% @iftex, @ifnothtml, @ifnotinfo always succeed; we read the text -% following, through the first @end iftex (etc.). Make `@end iftex' -% (etc.) valid only after an @iftex. -% -\def\iftex{\conditionalsucceed{iftex}} -\def\ifnothtml{\conditionalsucceed{ifnothtml}} -\def\ifnotinfo{\conditionalsucceed{ifnotinfo}} -\defineunmatchedend{iftex} -\defineunmatchedend{ifnothtml} -\defineunmatchedend{ifnotinfo} - -% We can't just want to start a group at @iftex (for example) and end it -% at @end iftex, since then @set commands inside the conditional have no -% effect (they'd get reverted at the end of the group). So we must -% define \Eiftex to redefine itself to be its previous value. (We can't -% just define it to fail again with an ``unmatched end'' error, since -% the @ifset might be nested.) -% -\def\conditionalsucceed#1{% - \edef\temp{% - % Remember the current value of \E#1. - \let\nece{prevE#1} = \nece{E#1}% - % - % At the `@end #1', redefine \E#1 to be its previous value. - \def\nece{E#1}{\let\nece{E#1} = \nece{prevE#1}}% - }% - \temp -} - -% We need to expand lots of \csname's, but we don't want to expand the -% control sequences after we've constructed them. -% -\def\nece#1{\expandafter\noexpand\csname#1\endcsname} - % @asis just yields its argument. Used with @table, for example. % \def\asis#1{#1} @@ -2322,6 +1977,355 @@ width0pt\relax} \fi \fi} +\message{conditionals,} +% Prevent errors for section commands. +% Used in @ignore and in failing conditionals. +\def\ignoresections{% + \let\chapter=\relax + \let\unnumbered=\relax + \let\top=\relax + \let\unnumberedsec=\relax + \let\unnumberedsection=\relax + \let\unnumberedsubsec=\relax + \let\unnumberedsubsection=\relax + \let\unnumberedsubsubsec=\relax + \let\unnumberedsubsubsection=\relax + \let\section=\relax + \let\subsec=\relax + \let\subsubsec=\relax + \let\subsection=\relax + \let\subsubsection=\relax + \let\appendix=\relax + \let\appendixsec=\relax + \let\appendixsection=\relax + \let\appendixsubsec=\relax + \let\appendixsubsection=\relax + \let\appendixsubsubsec=\relax + \let\appendixsubsubsection=\relax + \let\contents=\relax + \let\smallbook=\relax + \let\titlepage=\relax +} + +% Used in nested conditionals, where we have to parse the Texinfo source +% and so want to turn off most commands, in case they are used +% incorrectly. +% +\def\ignoremorecommands{% + \let\defcodeindex = \relax + \let\defcv = \relax + \let\deffn = \relax + \let\deffnx = \relax + \let\defindex = \relax + \let\defivar = \relax + \let\defmac = \relax + \let\defmethod = \relax + \let\defop = \relax + \let\defopt = \relax + \let\defspec = \relax + \let\deftp = \relax + \let\deftypefn = \relax + \let\deftypefun = \relax + \let\deftypevar = \relax + \let\deftypevr = \relax + \let\defun = \relax + \let\defvar = \relax + \let\defvr = \relax + \let\ref = \relax + \let\xref = \relax + \let\printindex = \relax + \let\pxref = \relax + \let\settitle = \relax + \let\setchapternewpage = \relax + \let\setchapterstyle = \relax + \let\everyheading = \relax + \let\evenheading = \relax + \let\oddheading = \relax + \let\everyfooting = \relax + \let\evenfooting = \relax + \let\oddfooting = \relax + \let\headings = \relax + \let\include = \relax + \let\lowersections = \relax + \let\down = \relax + \let\raisesections = \relax + \let\up = \relax + \let\set = \relax + \let\clear = \relax + \let\item = \relax +} + +% Ignore @ignore ... @end ignore. +% +\def\ignore{\doignore{ignore}} + +% Ignore @ifinfo, @ifhtml, @ifnottex, @html, @menu, and @direntry text. +% +\def\ifinfo{\doignore{ifinfo}} +\def\ifhtml{\doignore{ifhtml}} +\def\ifnottex{\doignore{ifnottex}} +\def\html{\doignore{html}} +\def\menu{\doignore{menu}} +\def\direntry{\doignore{direntry}} + +% @dircategory CATEGORY -- specify a category of the dir file +% which this file should belong to. Ignore this in TeX. +\let\dircategory = \comment + +% Ignore text until a line `@end #1'. +% +\def\doignore#1{\begingroup + % Don't complain about control sequences we have declared \outer. + \ignoresections + % + % Define a command to swallow text until we reach `@end #1'. + % This @ is a catcode 12 token (that is the normal catcode of @ in + % this texinfo.tex file). We change the catcode of @ below to match. + \long\def\doignoretext##1@end #1{\enddoignore}% + % + % Make sure that spaces turn into tokens that match what \doignoretext wants. + \catcode32 = 10 + % + % Ignore braces, too, so mismatched braces don't cause trouble. + \catcode`\{ = 9 + \catcode`\} = 9 + % + % We must not have @c interpreted as a control sequence. + \catcode`\@ = 12 + % + % Make the letter c a comment character so that the rest of the line + % will be ignored. This way, the document can have (for example) + % @c @end ifinfo + % and the @end ifinfo will be properly ignored. + % (We've just changed @ to catcode 12.) + \catcode`\c = 14 + % + % And now expand that command. + \doignoretext +} + +% What we do to finish off ignored text. +% +\def\enddoignore{\endgroup\ignorespaces}% + +\newif\ifwarnedobs\warnedobsfalse +\def\obstexwarn{% + \ifwarnedobs\relax\else + % We need to warn folks that they may have trouble with TeX 3.0. + % This uses \immediate\write16 rather than \message to get newlines. + \immediate\write16{} + \immediate\write16{WARNING: for users of Unix TeX 3.0!} + \immediate\write16{This manual trips a bug in TeX version 3.0 (tex hangs).} + \immediate\write16{If you are running another version of TeX, relax.} + \immediate\write16{If you are running Unix TeX 3.0, kill this TeX process.} + \immediate\write16{ Then upgrade your TeX installation if you can.} + \immediate\write16{ (See ftp://ftp.gnu.org/pub/gnu/TeX.README.)} + \immediate\write16{If you are stuck with version 3.0, run the} + \immediate\write16{ script ``tex3patch'' from the Texinfo distribution} + \immediate\write16{ to use a workaround.} + \immediate\write16{} + \global\warnedobstrue + \fi +} + +% **In TeX 3.0, setting text in \nullfont hangs tex. For a +% workaround (which requires the file ``dummy.tfm'' to be installed), +% uncomment the following line: +%%%%%\font\nullfont=dummy\let\obstexwarn=\relax + +% Ignore text, except that we keep track of conditional commands for +% purposes of nesting, up to an `@end #1' command. +% +\def\nestedignore#1{% + \obstexwarn + % We must actually expand the ignored text to look for the @end + % command, so that nested ignore constructs work. Thus, we put the + % text into a \vbox and then do nothing with the result. To minimize + % the change of memory overflow, we follow the approach outlined on + % page 401 of the TeXbook: make the current font be a dummy font. + % + \setbox0 = \vbox\bgroup + % Don't complain about control sequences we have declared \outer. + \ignoresections + % + % Define `@end #1' to end the box, which will in turn undefine the + % @end command again. + \expandafter\def\csname E#1\endcsname{\egroup\ignorespaces}% + % + % We are going to be parsing Texinfo commands. Most cause no + % trouble when they are used incorrectly, but some commands do + % complicated argument parsing or otherwise get confused, so we + % undefine them. + % + % We can't do anything about stray @-signs, unfortunately; + % they'll produce `undefined control sequence' errors. + \ignoremorecommands + % + % Set the current font to be \nullfont, a TeX primitive, and define + % all the font commands to also use \nullfont. We don't use + % dummy.tfm, as suggested in the TeXbook, because not all sites + % might have that installed. Therefore, math mode will still + % produce output, but that should be an extremely small amount of + % stuff compared to the main input. + % + \nullfont + \let\tenrm = \nullfont \let\tenit = \nullfont \let\tensl = \nullfont + \let\tenbf = \nullfont \let\tentt = \nullfont \let\smallcaps = \nullfont + \let\tensf = \nullfont + % Similarly for index fonts (mostly for their use in + % smallexample) + \let\indrm = \nullfont \let\indit = \nullfont \let\indsl = \nullfont + \let\indbf = \nullfont \let\indtt = \nullfont \let\indsc = \nullfont + \let\indsf = \nullfont + % + % Don't complain when characters are missing from the fonts. + \tracinglostchars = 0 + % + % Don't bother to do space factor calculations. + \frenchspacing + % + % Don't report underfull hboxes. + \hbadness = 10000 + % + % Do minimal line-breaking. + \pretolerance = 10000 + % + % Do not execute instructions in @tex + \def\tex{\doignore{tex}}% + % Do not execute macro definitions. + % `c' is a comment character, so the word `macro' will get cut off. + \def\macro{\doignore{ma}}% +} + +% @set VAR sets the variable VAR to an empty value. +% @set VAR REST-OF-LINE sets VAR to the value REST-OF-LINE. +% +% Since we want to separate VAR from REST-OF-LINE (which might be +% empty), we can't just use \parsearg; we have to insert a space of our +% own to delimit the rest of the line, and then take it out again if we +% didn't need it. Make sure the catcode of space is correct to avoid +% losing inside @example, for instance. +% +\def\set{\begingroup\catcode` =10 + \catcode`\-=12 \catcode`\_=12 % Allow - and _ in VAR. + \parsearg\setxxx} +\def\setxxx#1{\setyyy#1 \endsetyyy} +\def\setyyy#1 #2\endsetyyy{% + \def\temp{#2}% + \ifx\temp\empty \global\expandafter\let\csname SET#1\endcsname = \empty + \else \setzzz{#1}#2\endsetzzz % Remove the trailing space \setxxx inserted. + \fi + \endgroup +} +% Can't use \xdef to pre-expand #2 and save some time, since \temp or +% \next or other control sequences that we've defined might get us into +% an infinite loop. Consider `@set foo @cite{bar}'. +\def\setzzz#1#2 \endsetzzz{\expandafter\gdef\csname SET#1\endcsname{#2}} + +% @clear VAR clears (i.e., unsets) the variable VAR. +% +\def\clear{\parsearg\clearxxx} +\def\clearxxx#1{\global\expandafter\let\csname SET#1\endcsname=\relax} + +% @value{foo} gets the text saved in variable foo. +{ + \catcode`\_ = \active + % + % We might end up with active _ or - characters in the argument if + % we're called from @code, as @code{@value{foo-bar_}}. So \let any + % such active characters to their normal equivalents. + \gdef\value{\begingroup + \catcode`\-=12 \catcode`\_=12 + \indexbreaks \let_\normalunderscore + \valuexxx} +} +\def\valuexxx#1{\expandablevalue{#1}\endgroup} + +% We have this subroutine so that we can handle at least some @value's +% properly in indexes (we \let\value to this in \indexdummies). Ones +% whose names contain - or _ still won't work, but we can't do anything +% about that. The command has to be fully expandable, since the result +% winds up in the index file. This means that if the variable's value +% contains other Texinfo commands, it's almost certain it will fail +% (although perhaps we could fix that with sufficient work to do a +% one-level expansion on the result, instead of complete). +% +\def\expandablevalue#1{% + \expandafter\ifx\csname SET#1\endcsname\relax + {[No value for ``#1'']}% + \else + \csname SET#1\endcsname + \fi +} + +% @ifset VAR ... @end ifset reads the `...' iff VAR has been defined +% with @set. +% +\def\ifset{\parsearg\ifsetxxx} +\def\ifsetxxx #1{% + \expandafter\ifx\csname SET#1\endcsname\relax + \expandafter\ifsetfail + \else + \expandafter\ifsetsucceed + \fi +} +\def\ifsetsucceed{\conditionalsucceed{ifset}} +\def\ifsetfail{\nestedignore{ifset}} +\defineunmatchedend{ifset} + +% @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been +% defined with @set, or has been undefined with @clear. +% +\def\ifclear{\parsearg\ifclearxxx} +\def\ifclearxxx #1{% + \expandafter\ifx\csname SET#1\endcsname\relax + \expandafter\ifclearsucceed + \else + \expandafter\ifclearfail + \fi +} +\def\ifclearsucceed{\conditionalsucceed{ifclear}} +\def\ifclearfail{\nestedignore{ifclear}} +\defineunmatchedend{ifclear} + +% @iftex, @ifnothtml, @ifnotinfo always succeed; we read the text +% following, through the first @end iftex (etc.). Make `@end iftex' +% (etc.) valid only after an @iftex. +% +\def\iftex{\conditionalsucceed{iftex}} +\def\ifnothtml{\conditionalsucceed{ifnothtml}} +\def\ifnotinfo{\conditionalsucceed{ifnotinfo}} +\defineunmatchedend{iftex} +\defineunmatchedend{ifnothtml} +\defineunmatchedend{ifnotinfo} + +% We can't just want to start a group at @iftex (for example) and end it +% at @end iftex, since then @set commands inside the conditional have no +% effect (they'd get reverted at the end of the group). So we must +% define \Eiftex to redefine itself to be its previous value. (We can't +% just define it to fail again with an ``unmatched end'' error, since +% the @ifset might be nested.) +% +\def\conditionalsucceed#1{% + \edef\temp{% + % Remember the current value of \E#1. + \let\nece{prevE#1} = \nece{E#1}% + % + % At the `@end #1', redefine \E#1 to be its previous value. + \def\nece{E#1}{\let\nece{E#1} = \nece{prevE#1}}% + }% + \temp +} + +% We need to expand lots of \csname's, but we don't want to expand the +% control sequences after we've constructed them. +% +\def\nece#1{\expandafter\noexpand\csname#1\endcsname} + +% @defininfoenclose. +\let\definfoenclose=\comment + + \message{indexing,} % Index generation facilities @@ -4788,6 +4792,11 @@ width0pt\relax} \fi \def\turnoffmacros{\begingroup \def\do##1{\let\noexpand##1=\relax}% \edef\next{\macrolist}\expandafter\endgroup\next} + +% @alias. +\def\alias#1=#2{\let#1=#2} + + \message{cross references,} \newwrite\auxfile |