%% @texfile{
%% author = "Karl Berry and Oren Patashnik",
%% version = "0.99h",
%% date = "24 Apr 1991",
%% filename = "btxmac.tex",
%% address = "Please use electronic mail",
%% checksum = "812 4053 30557",
%% email = "opbibtex@neon.stanford.edu",
%% codetable = "ISO/ASCII",
%% supported = "yes",
%% docstring = "Defines macros that make BibTeX work with plain TeX",
%% }
% BibTeX-for-TeX macros, version 0.99h, for BibTeX 0.99c, TeX 3.0 or later.
% Copyright (C) 1990--91 by Karl Berry and Oren Patashnik; all rights reserved.
% You may copy this file provided: that it's accompanied by the
% "BibTeXing" document, whose text is contained in the file `btxdoc.tex';
% that any documentation you write for these macros also gives a
% reference for "BibTeXing"; and that either you make absolutely no
% changes to your copy, or if you do make changes, (1) you name the file
% something other than `btxmac.tex' and you remove all occurrences of
% `btxmac.tex' from the file, (2) you put, somewhere in the first twenty
% lines of the file, your name, along with an electronic address at which
% others who might use the file may reach you, and (3) you remove each
% occurrence of Oren's name and electronic address from this file. These
% restrictions help ensure that all standard versions of these macros are
% identical, and that Oren doesn't get deluged with inappropriate e-mail.
%
% This file, btxmac.tex, contains TeX macros that allow BibTeX, a
% bibliography program that was originally designed for use with LaTeX,
% to work with plain TeX. Please report any bugs (outright goofs,
% improvable macros, misfeatures, or unclear documentation) to Oren
% Patashnik (opbibtex@neon.stanford.edu). These macros will become
% frozen shortly after BibTeX version 1.00 is released.
%
% To use these macros you should be familiar with how BibTeX interacts
% with LaTeX, since BibTeX's interaction with TeX is very similar; that
% interaction is explained in the LaTeX manual. It also helps to
% have read "BibTeXing", the documentation that accompanies BibTeX.
% Then, if you want, you should redefine any of the macros that begin
% with `\bbl' or `\biblabel' or `\print' that you need to get formatting
% different from the default (the default settings are designed to
% accompany a bibliography style like BibTeX's standard style `plain').
% The macros you might want to change are described briefly a few
% paragraphs hence. Finally, as long as you follow the guidelines given
% by the LaTeX manual and "BibTeXing", you simply \input btxmac.
% [Remember the general scheme: Running (La)TeX writes information on
% the .aux (auxiliary) file; then running BibTeX reads information from
% the .aux, .bst (style), and .bib (database) files, and writes
% information (the bibliography) on a .bbl file; then running (La)TeX
% incorporates the bibliography; then running (La)TeX once more fixes
% the remaining forward references into the bibliography. Thus, to get
% everything incorporated into your output, you'll have to run (La)TeX,
% BibTeX, (La)TeX, (La)TeX. (Standup, sitdown, fight, fight, fight.)]
%
% These macros can stand alone or they can be \input into macro packages
% like Eplain. If you want to try out these macros on the 0.99 version
% of the xampl.bib file that's distributed with BibTeX (that version of
% the file has no self-identification), you'll need to define \mbox,
% which is a LaTeX command, to be \hbox.
%
%
% HISTORY
%
% Karl Berry wrote the original version of these macros in 1989 and
% 1990, for use in his `Eplain' package. Oren Patashnik modified them
% slightly in July 1990, as part of the official BibTeX distribution.
%
% 1-Aug-90 Version 0.99a, not released to the general public.
% 14-Aug-90 0.99b, first general release.
% 26-Aug-90 0.99c, made \@undefinedmessage work with other macro packages.
% 6-Sep-90 0.99d, allowed for general formatting of bibliography labels,
% for general formatting of (in-text) citations, and for
% changing certain catcodes while reading the .aux file.
% 14-Nov-90 0.99e, changed the way \@setletters works, made some \new...'s
% non-outer, and changed the way Eplain reads this file.
% 12-Dec-90 0.99f, made \@resetnumerals change the `,' and `.' catcodes; and
% added \biblabelextrahang, \@getoptionalarg, and \bblsc.
% 11-Mar-91 0.99g, made a few minor changes required by the way Eplain reads
% this file, but no functional changes.
% 24-Apr-91 0.99h, inhibited the reading and writing of the .aux file if it
% isn't used or if the \noauxfile macro is defined, and
% removed some .aux-file-opening detritus; printed the
% cite-key of undefined citations in \tt font; changed the
% catcode of `_' inside \cite; and called \@resetnumerals
% from inside a group.
%
%
% The LaTeX-related commands defined in this file include (a) the four
% commands that a user types (\bibliography, \bibliographystyle, \cite,
% and \nocite); (b) the three commands that BibTeX looks for in the .aux
% file (\bibdata, \bibstyle, and \citation---there is a fourth command
% that BibTeX looks for, but that command is related to LaTeX's \include
% facility, so these macros ignore that command); and (c) a LaTeX
% command (\newcommand) that's written by one of the four standard
% bibliography styles (alpha). The definitions here are not exactly the
% same as the corresponding LaTeX definitions (those eight LaTeX
% definitions depend on a significant fraction of LaTeX itself). But
% the only substantial differences are with \newcommand, which here,
% without complaining, lets you redefine a preexisting control sequence
% (in LaTeX, \newcommand won't let you redefine a preexisting command),
% and which here doesn't make the control sequences it defines \long (in
% LaTeX, that happens automatically); there may also be other minor
% differences. To summarize: Unless you know what you're doing, you
% shouldn't define any control sequences with these eight names:
%
% \bibdata
% \bibliography
% \bibliographystyle
% \bibstyle
% \citation
% \cite
% \newcommand
% \nocite
%
% There are three other commands written by one or more of the four
% standard (plain, abbrv, alpha, unsrt) or four semistandard (acm,
% apalike, ieeetr, siam) bibliography styles; they take effect only
% within the bibliography, and are redefinable, as explained later:
%
% \em
% \newblock
% \sc
%
% There's one control sequence you might want to use (but not redefine)
% in redefining \biblabelprint:
%
% \biblabelwidth
%
% There are twelve other control sequences (explained later in more detail)
% that the macros of this file will use if you define them---you should
% define them after the \input btxmac command but before the \bibliography
% command. The first five begin with `\bbl' and affect fonts, spacing,
% and perhaps other characteristics of the bibliography; the next three
% begin with `\biblabel' and determine how labels are formatted in the
% bibliography; and the last four begin with `\print' and determine how
% the in-text citations are formatted:
%
% \bblem
% \bblhook
% \bblnewblock
% \bblrm
% \bblsc
% \biblabelcontents
% \biblabelextrahang
% \biblabelprint
% \printbetweencitations
% \printcitefinish
% \printcitenote
% \printcitestart
%
% If it's defined before the \input btxmac command, the control sequence
% below inhibits the reading and writing of the .aux file(s), and the
% issuing of related warning messages. Any definition will do. This
% feature might help when you're working on draft stages of a document:
%
% \noauxfile
%
% Here's another control sequence (it's described later), with an `@'
% in its name, that you probably won't want to redefine unless you are
% writing another macro package; if you do redefine it, however, do it
% before the \input btxmac command:
%
% \@undefinedmessage
%
% And here are still more control sequences that, should you already have
% them defined, might conflict with the way the btxmac.tex macros use them
% (but since each of these has an `@' in its name, it's unlikely that such
% conflicts will arise unless you intend them):
%
% \@auxfile \@auxfiledonefalse \@auxfiledonetrue
% \@bracketcheck \@citation \@cite
% \@citedef \@citelabel \@citewarningfalse
% \@citewarningtrue \@commandname \@continuenewcommand
% \@emptymarkA \@emptymarkB \@fileexistsfalse
% \@fileexiststrue \@finishcitedef \@finishtestfileexistence
% \@for \@forloop \@fornoop
% \@fortmp \@getoptionalarg \@@getoptionalarg
% \@gobble \@if@auxfiledone \if@citewarning
% \@ifempty \@@ifempty \if@fileexists
% \if@notfirstcitation \@iforloop \@innerdef
% \@innernewcount \@innernewdimen \@innernewif
% \@innernewwrite \@itemnum \@letter
% \@linenumber \@newcommandwithargs \@newcommand
% \@next \@nextwhile \@nil
% \@nnil \@notfirstcitationfalse \@notfirstcitationtrue
% \@numparams \@oldatcatcode \@onecitation
% \@optionalarg \@other \@paramdef
% \@readauxfile \@readbblfile \@resetnumerals
% \@scfont \@setletters \@spacesub
% \@startdef \@testfileexistence \@tokstostring
% \@ttsA \@ttsB \@ttsmarkA
% \@ttsmarkB \@undefined \@writeaux
%
%
% So to start things off we turn `@' into a letter (category code 11),
% keeping track of the old category code for future restoration.
% (Simply resetting it to 12 when we leave these macros is
% insufficient.) The use of `\cite' as a temporary control sequence is
% a kludge, but it's a reasonably simple way to accomplish what we need
% without possibly overwriting something (without an `@' in its name)
% that might already be defined.
%
\edef\cite{\the\catcode`@}%
\catcode`@ = 11
\let\@oldatcatcode = \cite
\chardef\@letter = 11
\chardef\@other = 12
%
%
% Next come some things that will be useful later.
%
% Make an outer definition into an inner one (due to Chris Thompson).
% The arguments should be the control sequence to be defined, and the
% new of the \outer control sequence, as characters; the control
% sequence #1 is defined to be just the same as \csname#2\endcsname, but
% not \outer. For example, \@innerdef\innernewcount{newcount} would
% define \innernewcount to be a non-outer version of \newcount.
%
\def\@innerdef#1#2{\edef#1{\expandafter\noexpand\csname #2\endcsname}}%
%
% We use \@innerdef to make some of our allocations local, because
% Eplain includes our code inside a conditional. We put @'s in the
% names to minimize the (already small) chance of conflicts.
%
\@innerdef\@innernewcount{newcount}%
\@innerdef\@innernewdimen{newdimen}%
\@innerdef\@innernewif{newif}%
\@innerdef\@innernewwrite{newwrite}%
%
%
% Swallow one parameter.
%
\def\@gobble#1{}%
%
%
% Use TeX 3.0's \inputlineno to get the line number, for better error
% messages, but if we're using an old version of TeX, don't do anything.
%
\ifx\inputlineno\@undefined
\let\@linenumber = \empty % Pre-3.0.
\else
\def\@linenumber{\the\inputlineno:\space}%
\fi
%
%
% \@getoptionalarg\CS gets an optional argument from the input, enclosed
% in brackets, then expands \CS. We set \@optionalarg to \empty if we
% don't find one, otherwise to the text of the argument. This assumes
% the brackets don't have a funny category code.
%
\def\@getoptionalarg#1{\let\temp = #1\futurelet\next\@bracketcheck}%
\def\@bracketcheck{\begingroup
\if [\next
\aftergroup\@@getoptionalarg
\else
\global\let\@optionalarg = \empty
%
% We can't do the \aftergroup\temp after the \fi, because then the
% \temp gets in the way of reading the optional argument from the
% input, if we do have one.
\aftergroup\temp
\fi
\endgroup}%
%
\def\@@getoptionalarg[#1]{%
\def\@optionalarg{#1}%
\temp
}%
%
%
% \@tokstostring converts its argument into a list of character tokens.
% It uses no commands that are executed in the stomach, only expansions
% handled in the gullet. (This is necessary for use with \edef).
%
% Control sequences in the argument are not expanded. Blanks become a
% \spacesub. The argument shouldn't contain other special characters.
%
\def\@tokstostring#1{\@ttsA#1 \@ttsmarkA}%
%
% \@ttsA partitions a sequence of tokens into portions delimited by blanks.
%
\def\@ttsA#1 #2\@ttsmarkA{%
\@ifempty{#1}\else
\@ttsB #1\@ttsmarkB
%
\@ifempty{#2}\else
\@spacesub\@ttsA#2\@ttsmarkA
\fi
\fi
}%
%
% \@ttsB processes a sequence of tokens with no contained blanks.
%
\def\@ttsB#1{%
\ifx #1\@ttsmarkB\else
\string #1%
\expandafter\@ttsB
\fi
}%
%
% This is just so \ifx won't complain about an undefined control sequence.
%
\def\@ttsmarkB{\@ttsmarkB}% should never be expanded
%
% The expansion of this macro replaces spaces.
%
\def\@spacesub{+}%
%
%
% \@ifempty tests if it is given an argument.
%
\def\@ifempty#1{\@@ifempty #1\@emptymarkA\@emptymarkB}%
\def\@@ifempty#1#2\@emptymarkB{\ifx #1\@emptymarkA}%
%
\def\@emptymarkA{\@emptymarkA}% Again, so \ifx won't complain.
%
%
% From LaTeX.
%
\def\@nnil{\@nil}%
\def\@fornoop#1\@@#2#3{}%
%
\def\@for#1:=#2\do#3{%
\edef\@fortmp{#2}%
\ifx\@fortmp\empty \else
\expandafter\@forloop#2,\@nil,\@nil\@@#1{#3}%
\fi
}%
%
\def\@forloop#1,#2,#3\@@#4#5{\def#4{#1}\ifx #4\@nnil \else
#5\def#4{#2}\ifx #4\@nnil \else#5\@iforloop #3\@@#4{#5}\fi\fi
}%
%
\def\@iforloop#1,#2\@@#3#4{\def#3{#1}\ifx #3\@nnil
\let\@nextwhile=\@fornoop \else
#4\relax\let\@nextwhile=\@iforloop\fi\@nextwhile#2\@@#3{#4}%
}%
%
%
% This macro tests if a file \jobname.#1 exists, and sets
% \if@fileexists appropriately. If an optional argument is given, it is
% used as the root part of the filename instead of \jobname.
%
\@innernewif\if@fileexists
%
\def\@testfileexistence{\@getoptionalarg\@finishtestfileexistence}%
\def\@finishtestfileexistence#1{%
\begingroup
\def\extension{#1}%
\immediate\openin0 =
\ifx\@optionalarg\empty\jobname\else\@optionalarg\fi
\ifx\extension\empty \else .#1\fi
\space
\ifeof 0
\global\@fileexistsfalse
\else
\global\@fileexiststrue
\fi
\immediate\closein0
\endgroup
}%
%
%
%% [[[start of BibTeX-specific stuff]]]
%
% Now come the four main LaTeX commands and their associated .aux
% commands. Just as in LaTeX, \bibliographystyle defines the BibTeX
% style name (.bst file, that is), and \bibliography defines the
% database (.bib) file(s). The corresponding .aux-file commands are
% \bibstyle and \bibdata, which are there only for BibTeX's (but not
% LaTeX's) use.
%
\def\bibliographystyle#1{%
\@readauxfile
\@writeaux{\string\bibstyle{#1}}%
}%
\let\bibstyle = \@gobble
%
% As well as writing the \bibdata command to tell BibTeX
% which .bib files to read, we read the .bbl file that
% BibTeX (or a person, conceivably) has produced.
%
\def\bibliography#1{%
\@readauxfile
\@writeaux{\string\bibdata{#1}}%
\@testfileexistence{bbl}%
\if@fileexists
\@readbblfile
\fi
}%
\let\bibdata = \@gobble
%
% The \nocite{label,label,...} command writes its argument to \@auxfile,
% unless instructed not to, but produces no text in the document. Both
% the \nocite and \cite commands produce \citation commands in the .aux file.
%
\def\nocite#1{%
\@readauxfile
\@writeaux{\string\citation{#1}}%
}%
%
\@innernewif\if@notfirstcitation
%
% \cite[note]{label,label,...} produces the citations for the labels as
% well. If the optional argument `note' is present, it's added after
% the labels. Since \cite calls \nocite before doing any writing, it
% doesn't need to call \@readauxfile. We change the category code of
% `_' so that the dummy definition given to the citation label doesn't
% include a subcript character; that would cause TeX to complain.
%
\def\cite{\begingroup\catcode`_ = \@letter \@getoptionalarg\@cite}%
%
% Typeset the citations for the labels in #1, followed by the note, if
% it exists. To change the citation's format in the text, redefine one
% or more `\print...' macros, whose defaults appear later in this file.
%
\def\@cite#1{%
\nocite{#1}%
% Start printing the text, beginning with a left bracket by default.
%
\printcitestart
\@notfirstcitationfalse
\@for \@citation :=#1\do
{%
\expandafter\@onecitation\@citation\@@
}%
\ifx\empty\@optionalarg\else
\printcitenote{\@optionalarg}%
\fi
\printcitefinish
\endgroup
}%
%
\def\@onecitation#1\@@{%
\if@notfirstcitation
\printbetweencitations
\fi
%
\expandafter \ifx \csname\@citelabel{#1}\endcsname \relax
\if@citewarning
\message{\@linenumber Undefined citation `#1'.}%
\fi
% Give it a dummy definition:
\expandafter\gdef\csname\@citelabel{#1}\endcsname{%
{\tt \nobreak\hskip0pt#1\nobreak\hskip0pt}}%
\fi
% Now produce the text, whether it was undefined or not.
\csname\@citelabel{#1}\endcsname
\@notfirstcitationtrue
}%
%
% Given a label `foo', the macro `\b@foo' is supposed to
% hold the text that should be produced.
%
\def\@citelabel#1{\@tokstostring{b@#1}}%
%
% So, how does a citation label get defined? When we read the .bbl file
% (below), a \bibitem writes out a \@citedef command. And when we read
% the \@citedef, we define \@citelabel{#1}, where #1 is the user's
% label. But we have to be careful when reading the \@citedef, because
% the second argument might have accents or other commands with numbers
% as arguments. We have given the numerals category code 11 for reading
% the .aux file, and that prevents them from being recognized as TeX
% <number>s. Similarly for the other characters that can be part of a
% <number>. So we have to reset the category codes before reading the
% second argument. We also have to reset them back to letters when we
% finish reading the \@citedef's, because there might be more labels
% with numerals in them defined afterwards in the .aux file, put there
% by Eplain or whatever.
%
\def\@citedef#1{%
\begingroup
\@resetnumerals
\@finishcitedef{#1}%
}%
\def\@finishcitedef#1#2{%
\expandafter\gdef\csname\@citelabel{#1}\endcsname{#2}%
\endgroup
}%
\def\@resetnumerals{%
\catcode`0 = \@other \catcode`1 = \@other \catcode`2 = \@other
\catcode`3 = \@other \catcode`4 = \@other \catcode`5 = \@other
\catcode`6 = \@other \catcode`7 = \@other \catcode`8 = \@other
\catcode`9 = \@other \catcode`" = \@other \catcode`' = \@other
\catcode`` = \@other \catcode`, = \@other \catcode`. = \@other
}%
%
%
% Reading the .bbl file also produces the typeset bibliography. Please
% notice, however, that we do not produce the title for the references
% (e.g., `References'), as LaTeX does. The formatting and spacing of
% that title, whether it should go into the headline, and so on, are all
% things determined by your format. We cannot know those things in
% advance. If you wish, you can define \bblhook to produce the title.
% Or just do it before the \bibliography command.
%
\def\@readbblfile{%
% Define a counter to tell us which item number we are on.
\@innernewcount\@itemnum
%
\begingroup
\def\begin##1##2{%
% ##1 is just `thebibliography'.
% ##2 is the widest label.
% We set (new dimen) \biblabelwidth based on the widest label
\setbox0 = \hbox{\biblabelcontents{##2}}%
\biblabelwidth = \wd0
}%
\def\end##1{}% ##1 is `thebibliography' again.
%
% Here we have two possibilities:
% \bibitem[typesetlabel]{citationlabel}
% \bibitem{citationlabel}
% If we have the second of these, the citations are numbered, starting
% from one; we use our own count register \@itemnum for this.
%
\@itemnum = 0
\def\bibitem{\futurelet\next\@bibitem}%
\def\@bibitem{%
\begingroup \if [\next
\aftergroup\@alphabibitem
\else
\aftergroup\@numberedbibitem
\fi \endgroup
}%
\def\@alphabibitem[##1]##2{%
% Need \xdef here for various reasons.
\expandafter \xdef\csname\@citelabel{##2}\endcsname {##1}%
\@finishbibitem{##2}%
}%
%
\def\@numberedbibitem##1{%
\advance\@itemnum by 1
\expandafter \xdef\csname\@citelabel{##1}\endcsname{\number\@itemnum}%
\@finishbibitem{##1}%
}%
%
\def\@finishbibitem##1{%
\biblabelprint{\csname\@citelabel{##1}\endcsname}%
\@writeaux{\string\@citedef{##1}{\csname\@citelabel{##1}\endcsname}}%
\ignorespaces
}%
%
% Do the printing (we're producing the bibliography, remember).
%
\let\em = \bblem
\let\newblock = \bblnewblock
\let\sc = \bblsc
% Punctuation won't affect spacing;
\frenchspacing
% the penalties below are from LaTeX's [article,book,report].sty;
\clubpenalty = 4000 \widowpenalty = 4000
% the next two values come from LaTeX's \sloppy command;
\tolerance = 10000 \hfuzz = .5pt
\everypar = {\hangindent = \biblabelwidth
\advance\hangindent by \biblabelextrahang}%
\bblrm
% the \parskip is a guess at what looks good;
\parskip = 1.5ex plus .5ex minus .5ex
% and the .5em matches the \enspace of \biblabelprint below.
\biblabelextrahang = .5em
\bblhook
%
\input \jobname.bbl
\endgroup
}%
%
% The widest label's width is useful for redefining \biblabelprint; you
% redefine \biblabelwidth, in effect, by redefining the
% \biblabelcontents macro that appears below. And \biblabelextrahang,
% which is redefinable inside \bblhook, is added to \biblabelwidth to
% determine the amount of hanging indentation.
%
\@innernewdimen\biblabelwidth
\@innernewdimen\biblabelextrahang
%
% Now come the main macros that are related to the printing of the
% bibliography. Since you might want to redefine them, they are given
% default definitions outside of \@readbblfile.
%
% The first one controls the printing of a bibliography entry's label.
% If you change it, make sure that it starts with something like
% \noindent or \indent that puts TeX into horizontal mode (even if the
% label itself is empty); otherwise, the hanging indentation will get
% messed up in certain circumstances.
%
\def\biblabelprint#1{%
\noindent\hbox to \biblabelwidth{\biblabelcontents{#1}\hss}\enspace}%
%
% By default the labels are typeset in \bblrm, and enclosed in brackets.
%
\def\biblabelcontents#1{\bblrm [#1]}%
%
% The main text, too, is typeset using \bblrm, which is \rm by default.
%
\def\bblrm{\rm}%
%
% Emphasis for producing, e.g., titles, is done with \it by default.
%
\def\bblem{\it}%
%
% Some styles use a caps-and-small-caps font for author names. LaTeX
% defines an \sc command but plain TeX doesn't, so we need one here.
% The definition below doesn't load the font unless it's needed, but it
% tries to load only the 10pt version, because it might not exist at
% other point sizes.
%
\def\bblsc{\ifx\@scfont\@undefined
\font\@scfont = cmcsc10
\fi
\@scfont
}%
%
% The major parts of an entry are separated with \bblnewblock. The
% numbers below are taken from LaTeX's `article' style.
%
\def\bblnewblock{\hskip .11em plus .33em minus .07em}%
%
% Here's where you stick any other bibliography-formatting goodies, or
% redefine the values above.
%
\let\bblhook = \empty
%
%
% Here are the four default definitions for formatting the in-text
% citations. These are what you redefine (after your \input btxmac but
% before your \bibliography) to get parens instead of brackets, or
% superscripts, or footnotes, or whatever.
%
\def\printcitestart{[}% left bracket
\def\printcitefinish{]}% right bracket
\def\printbetweencitations{, }% comma, space
\def\printcitenote#1{, #1}% comma, space, note (if it exists)
%
% That scheme is pretty flexible. For example you could use
% \def\printcitestart{$^\bgroup}
% \def\printcitefinish{\egroup$}
% \def\printbetweencitations{,}
% \def\printcitenote#1{\hbox{\sevenrm\space (#1)}}
% to get superscripted in-text citations. To get something radically
% different, however, you'll have to define your own \cite command.
%
% When we read this from the .aux file, \citation means nothing.
%
\let\citation = \@gobble
%
%
% Now comes the stuff for dealing with LaTeX's \newcommand. As
% mentioned earlier, this \newcommand will redefine a preexisting
% command; that's different from how LaTeX's \newcommand behaves.
%
\@innernewcount\@numparams
%
% \newcommand{\foo}[n]{text} defines the control sequence \foo to have
% n parameters, and replacement text `text'.
%
\def\newcommand#1{%
\def\@commandname{#1}%
\futurelet\@next\@continuenewcommand
}%
%
% Figure out if this definition has parameters.
%
\def\@continuenewcommand{\begingroup
\if [\@next
\aftergroup\@newcommandwithargs
\else
\global\@numparams = 0
\aftergroup\@newcommand
\fi
\endgroup}%
%
\def\@newcommandwithargs[#1]{%
\global\@numparams = #1
\@newcommand
}%
%
% \@numparams is how many arguments this command has. The name of the
% command is \@commandname. The replacement text for the new macro is #1.
%
\def\@newcommand#1{%
\def\@startdef{\expandafter\edef\@commandname}%
\ifnum\@numparams=0
\let\@paramdef = \empty
\else
\ifnum\@numparams>9
\errmessage{\the\@numparams\space is too many parameters}%
\else
\ifnum\@numparams<0
\errmessage{\the\@numparams\space is too few parameters}%
\else
\edef\@paramdef{%
% This is disgusting, but \loop doesn't work inside \edef,
% because \body isn't defined.
%
\ifcase\@numparams
\empty No arguments.
\or ####1%
\or ####1####2%
\or ####1####2####3%
\or ####1####2####3####4%
\or ####1####2####3####4####5%
\or ####1####2####3####4####5####6%
\or ####1####2####3####4####5####6####7%
\or ####1####2####3####4####5####6####7####8%
\or ####1####2####3####4####5####6####7####8####9%
\fi
}%
\fi
\fi
\fi
\expandafter\@startdef\@paramdef{#1}%
}%
%
%% [[[end of BibTeX-specific stuff]]]
%
%
% Names of references (arguments given in the \cite and \nocite
% commands) and file names (arguments given in the \bibliography and
% \bibliographystyle commands) are recorded in \jobname.aux, called the
% \@auxfile in these macros. Here's how they get read in.
%
\def\@readauxfile{%
\if@auxfiledone \else % remember: \@auxfiledonetrue if \noauxfile is defined
\global\@auxfiledonetrue
\@testfileexistence{aux}%
\if@fileexists
\begingroup
% Because we might be in horizontal mode when \@readauxfile
% is called (if it's in response to a \cite or \nocite), we
% want to ignore all the would-be spaces at the ends of
% lines in the aux file. Fortunately, there are never any
% (non-pathological) cases where an end-of-line might
% actually be desired. If you really need to do something
% strange, you can redefine \@setletters to do something
% besides what it does now (this is intentionally left as
% being somewhat painful to do).
\endlinechar = -1
\@setletters
\input \jobname.aux
\endgroup
\else
\message{\@undefinedmessage}%
\global\@citewarningfalse
\fi
\immediate\openout\@auxfile = \jobname.aux
\fi
}%
%
% The \@readauxfile macro does all that work the first time it's called.
% Since it's called once for every \cite, \nocite, \bibliography, and
% \bibliographystyle command that the user issues, we need to remember
% whether the work's been done. It's considered done if we're not to do
% it---that is, if \noauxfile is defined.
%
\newif\if@auxfiledone
\ifx\noauxfile\@undefined \else \@auxfiledonetrue\fi
%
% Since lots of characters are allowable inside reference names, and
% since a reference name can get converted into a control sequence,
% \@readauxfile must treat many characters as letters. It does that by
% calling \@setletters, which changes the category code of all \@other
% characters to \@letter. The 128/256 business arises because character
% codes go up to 256 starting with TeX 3.0, but up to only 128 with
% earlier versions.
%
\def\@setletters{%
\count255 = 0
\edef\temp{\ifx\inputlineno\@undefined 128\else 256\fi}%
\loop
\ifnum\catcode\count255 = \@other
\catcode\count255 = \@letter
\fi
\advance\count255 by 1
\ifnum\count255<\temp
\repeat
% The Eplain package uses underscores to construct the label names.
\catcode`\_ = \@letter
}%
%
% It's conceivable you'd want to change how other characters are read;
% to do that, change their category code before doing \input btxmac.
%
%
% After reading the .aux file, \@readauxfile opens it for writing.
% The \@writeaux macro does the actual writing (as long as
% \noauxfile is undefined).
%
\@innernewwrite\@auxfile
\def\@writeaux#1{\ifx\noauxfile\@undefined \write\@auxfile{#1}\fi}%
%
%
% A macro package that uses btxmac.tex might define
% \@undefinedmessage (before doing an \input btxmac).
%
\ifx\@undefinedmessage\@undefined
\def\@undefinedmessage{No .aux file; I won't give you warnings about
undefined citations.}%
\fi
%
% Even if citations are undefined, we want to complain only if
% \@citewarningtrue. The default is to set \@citewarningtrue unless
% \noauxfile is defined. Again, a macro package that uses
% btxmac.tex might want to redefine this.
%
\@innernewif\if@citewarning
\ifx\noauxfile\@undefined \@citewarningtrue\fi
%
%
% Finally, before leaving we restore @'s old category code.
%
\catcode`@ = \@oldatcatcode