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-%% @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