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authorKarl Berry <karl@freefriends.org>2006-01-11 23:51:04 +0000
committerKarl Berry <karl@freefriends.org>2006-01-11 23:51:04 +0000
commitbf7e5eda82d5177d838d28170dce0f539f5e1687 (patch)
tree2cd920ffe6994cdaab8d37b5b0a59df9a5111822 /Master/texmf-dist/source/latex/base/docstrip.dtx
parent83bcc02ee855f0bf515d44433547956d38805bf0 (diff)
trunk/Master/texmf-dist/source/latex/base
git-svn-id: svn://tug.org/texlive/trunk@151 c570f23f-e606-0410-a88d-b1316a301751
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+% \iffalse meta-comment
+%
+% Copyright 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004
+% The LaTeX3 Project and any individual authors listed elsewhere
+% in this file.
+%
+% This file is part of the LaTeX base system.
+% -------------------------------------------
+%
+% It may be distributed and/or modified under the
+% conditions of the LaTeX Project Public License, either version 1.3
+% of this license or (at your option) any later version.
+% The latest version of this license is in
+% http://www.latex-project.org/lppl.txt
+% and version 1.3 or later is part of all distributions of LaTeX
+% version 2003/12/01 or later.
+%
+% This file has the LPPL maintenance status "maintained".
+%
+% The list of all files belonging to the LaTeX base distribution is
+% given in the file `manifest.txt'. See also `legal.txt' for additional
+% information.
+%
+% The list of derived (unpacked) files belonging to the distribution
+% and covered by LPPL is defined by the unpacking scripts (with
+% extension .ins) which are part of the distribution.
+%
+% \fi
+\catcode`\{=1
+\catcode`\}=2
+\def\filename{docstrip.dtx}
+\def\fileversion{2.5c}
+\def\filedate{2003/09/18}
+\def\docdate {1999/03/31}
+% \CheckSum{2436}
+%% \CharacterTable
+%% {Upper-case \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
+%% Lower-case \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
+%% Digits \0\1\2\3\4\5\6\7\8\9
+%% Exclamation \! Double quote \" Hash (number) \#
+%% Dollar \$ Percent \% Ampersand \&
+%% Acute accent \' Left paren \( Right paren \)
+%% Asterisk \* Plus \+ Comma \,
+%% Minus \- Point \. Solidus \/
+%% Colon \: Semicolon \; Less than \<
+%% Equals \= Greater than \> Question mark \?
+%% Commercial at \@ Left bracket \[ Backslash \\
+%% Right bracket \] Circumflex \^ Underscore \_
+%% Grave accent \` Left brace \{ Vertical bar \|
+%% Right brace \} Tilde \~}
+%%
+%
+%\iffalse
+%
+%% The docstrip program for use with TeX.
+%% Copyright (C) 1989-1991 Frank Mittelbach
+%% Copyright (C) 1992-1995 Johannes Braams, Denys Duchier,
+%% Frank Mittelbach
+%% Copyright (C) 1995 Marcin Woli\'nski
+%% Copyright (C) 1996-1997 Mark Wooding, Marcin Woli\'nski
+%% Copyright (C) 1998-2003 LaTeX3 project and the above authors
+%% All rights are reserved.
+%%
+%
+% \fi
+%
+% \changes{2.0b}{1991/05/29}{Added bugfix from Denys}
+% \changes{2.0c}{1991/05/29}{Allow almost all characters in guard (DD)}
+% \changes{2.0d}{1991/05/31}{Started merging in some of Franks code}
+% \changes{2.0j}{1992/03/05}{Wrote introduction}
+% \changes{2.0m}{1992/04/21}{Renamed all macros that deal with the
+% parsing of boolean expressions}
+% \changes{2.0m}{1992/04/25}{Removed dependency from ltugboat,
+% incorporated driver file into source.}
+% \changes{2.0m}{1992/04/25}{Added some missing percents; corrected some
+% typos}
+% \changes{2.0m-DL}{1992/05/08}{Various small corrections to English and
+% typos}
+% \changes{2.0q}{1992/07/01}{Changed all dates to yy/mm/dd for better
+% sorting}
+% \changes{2.2a}{1993/12/02}{Update for LaTeX2e}
+% \changes{2.2c}{1993/12/17}{Renamed texsys.tex to texsys.cfg.}
+% \changes{2.3a}{1995/08/17}{Swapped Primary with Secondary since
+% expressions are generally described bottom-up}
+% \changes{2.3b}{1995/08/22}{Completely changed expressions parser}
+% \changes{2.3b}{1995/08/23}{Removed mechanism for checking if previous
+% one-line guard is same as current (\cs{testOption},
+% \cs{closeOption})---this is not a common
+% case and testing complicates things unnecessarily}
+% \changes{2.3c}{1995/08/24}{When file is multiply listed in \cs{file}
+% clause it \emph{is} multiply read}
+% \changes{2.3c}{1995/09/04}{Changed some dirty tricks to be
+% less/more dirty---all uses of \cs{afterfi}}
+% \changes{2.3e}{1995/09/25}{Directories support}
+% \changes{2.3e}{1995/10/24}{added \cs{makepathname} to support
+% systems with bizzare pathnames}
+% \changes{2.3e}{1995/10/25}{batch files work by \cs{input}}
+% \changes{2.3e}{1996/10/02}{Introduced ``open lists''}
+% \changes{2.4a}{1996/06/06}{Add stream limits (MDW)}
+% \changes{2.4c}{1996/06/11}{Add initex support (DPC)}
+%
+% \DoNotIndex{\#,\$,\%,\&,\@,\\,\{,\},\^,\_,\~,\ }
+% \DoNotIndex{\@ne}
+% \DoNotIndex{\advance,\begingroup,\catcode,\closein,\closeout}
+% \DoNotIndex{\day,\def,\edef,\else,\empty,\endgroup,\errmessage}
+% \DoNotIndex{\expandafter,\fi,\futurelet,\gdef,\global,\if,\ifeof}
+% \DoNotIndex{\ifx,\immediate,\let,\loop,\m@ne,\message,\month}
+% \DoNotIndex{\newcount}
+% \DoNotIndex{\newif,\newlinechar,\newread,\newtoks,\newwrite}
+% \DoNotIndex{\noexpand,\openin,\openout,\par,\read,\relax,\repeat}
+% \DoNotIndex{\space,\the,\undefined,\write,\xdef,\year,\z@}
+%
+% ^^A some definitions for this documentation
+%
+% \newcommand{\ds}{\textsf{DocStrip}} ^^A maybe?
+% \newcommand{\bsl}{\protect\bslash}
+% \newcommand{\note}[1]{\marginpar{\textbf{#1}}}
+% \newcommand{\netaddress}[1]{\texttt{#1}}
+%
+% ^^A override the default in doc.sty
+% \makeatletter
+% \renewenvironment{theglossary}{%
+% \glossary@prologue%
+% \GlossaryParms \let\item\@idxitem \ignorespaces}%
+% {}
+% \makeatother
+%
+%
+% \changes{2.1c}{1993/02/25}{Added a setting for StandardModuleDepth}
+% \setcounter{StandardModuleDepth}{1}
+%
+% \title{The \ds{} program%
+% \thanks{This file has version number \fileversion,
+% last revised \filedate,
+% documentation dated \docdate.}}
+%
+% \changes{2.1b}{1993/02/23}{modified mailaddress of Johannes}
+% \changes{2.4i}{1998/01/18}{removed mail addresses as it is hopeless
+% to keep them uptodate}
+% \author{%
+% Frank Mittelbach
+% \and
+% Denys Duchier
+% \and
+% Johannes Braams
+% \and
+% Marcin Woli\'nski
+% \and
+% Mark Wooding
+% }
+%
+% \date{Printed \today}
+%
+% \maketitle
+%
+% \begin{abstract}
+% This document describes the implementation of the \ds{} program.
+% The original version of this program was developed by Frank
+% Mittelbach to accompany his \texttt{doc.sty} which enables literate
+% programming in \LaTeX\@. Denys Duchier rewrote it to run either
+% with \TeX\ or with \LaTeX, and to allow full boolean expressions in
+% conditional guards instead of just comma-separated lists.
+% Johannes Braams re-united the two implementations, documented and
+% debugged the code.
+%
+% In September 1995 Marcin Woli\'nski changed many parts of the
+% program to make use of \TeX's ability to write to multiple files
+% at the same time to avoid re-reading sources. The performance
+% improvement of version~2.3 came at a price of compatibility with
+% some more obscure operating systems which limit the number of
+% files a process can keep open. This was corrected in September
+% 1996 by Mark Wooding and his changes were ``creatively merged''
+% by Marcin Woli\'nski who made at the same time changes in batch
+% files processing, handling of preambles and introduced ``verbatim
+% mode''. After all that, David Carlisle merged the new version into
+% the \LaTeX\ sources, and made a few other changes, principally
+% making \ds{} work under initex, and removing the need for
+% batch files to say \verb|\def\batchfile{...}|.
+% \end{abstract}
+%
+% \section{Introduction}
+%
+% \subsection{Why the \ds{} program?} When Frank Mittelbach created
+% the \texttt{doc} package, he invented a way to combine \TeX\ code
+% and its documentation. From then on it was more or less possible
+% to do literate programming in \TeX.
+%
+% This way of writing \TeX\ programs obviously has great
+% advantages, especially when the program becomes larger than a
+% couple of macros. There is one drawback however, and that is
+% that such programs may take longer than expected to run because
+% \TeX\ is an interpreter and has to decide for each line of the
+% program file what it has to do with it. Therefore, \TeX\ programs
+% may be speeded up by removing all comments from them.
+%
+% By removing the comments from a \TeX\ program a new problem is
+% introduced. We now have two versions of the program and both of
+% them {\em have\/} to be maintained. Therefore it would be nice to
+% have a possibility to remove the comments automatically, instead
+% of doing it by hand. So we need a program to remove comments from
+% \TeX\ programs. This could be programmed in any high level
+% language, but maybe not everybody has the right compiler to
+% compile the program. Everybody who wants to remove comments from
+% \TeX\ programs has \TeX\@. Therefore the \ds{} program is
+% implemented entirely in \TeX.
+%
+% \subsection{Functions of the \ds{} program}
+%
+% Having created the \ds{} program to remove comment lines from
+% \TeX\ programs\footnote{Note that only comment lines, that is
+% lines that start with a single \texttt{\%} character, are removed;
+% all other comments stay in the code.} it became feasible to do more
+% than just strip comments.\\ Wouldn't it be nice to have a way to
+% include parts of the code only when some condition is set true?
+% Wouldn't it be as nice to have the possibility to split the
+% source of a \TeX\ program into several smaller files and combine
+% them later into one `executable'?\\ Both these wishes have been
+% implemented in the \ds{} program.
+%
+% \section{How to use the \ds{} program}
+% A number of ways exist to use the \ds{} program:
+% \begin{enumerate}
+% \item The usual way to use \ds{} is to write a \emph{batch file}
+% in such a way that it can be directly processed by \TeX{}.
+% The batch file should contain the commands described below for
+% controlling the \ds{} program.
+% This allows you to set up a distribution where you can instruct
+% the user to simply run
+% \begin{quote}
+% \texttt{TEX} \meta{batch file}
+% \end{quote}
+% to generate the executable versions of your files from the
+% distribution sources.
+% Most of the \LaTeX\ distribution is packaged this way.
+% To produce such a batch file include a statement in your
+% `batch file' that
+% instructs \TeX\ to read \texttt{docstrip.tex}.
+% The beginning of such a file would look like:
+%\begin{verbatim}
+% \input docstrip
+% ...
+%\end{verbatim}
+% By convention the batch file should have extension |.ins|. But
+% these days \ds{} in fact work with any extension.
+%
+% \item Alternatively you can instruct \TeX\ to read the file
+% \texttt{docstrip.tex} and to see what happens. \TeX\ will ask
+% you a few questions about the file you would like to be
+% processed. When you have answered these questions it does
+% its job and strips the comments from your \TeX\ code.
+% \end{enumerate}
+%
+% \section{Configuring \ds}
+% \subsection{Selecting output directories}
+% \changes{2.3e}{1996/09/19}{Added documentation}
+% Inspired by a desire to simplify reinstallations of \LaTeXe{} and
+% to support operating systems which have an upper limit on the
+% number of files allowed in a directory, \ds\ now allows
+% installation scripts to specify output directories for files it
+% creates. We suggest using TDS (\TeX\ directory structure) names
+% of directories relative to \texttt{texmf} here. However these
+% names should be thought of as a labels rather than actual names
+% of directories. They get translated to actual system-dependent
+% pathnames according to commands contained in a configuration file
+% named \texttt{docstrip.cfg}.
+%
+% The configuration file is read by \ds{} just before it starts to
+% process any batch file commands.
+%
+% If this file is not present \ds{} uses some default settings which
+% ensure that files are only written to the current directory.
+% However by use of this configuration file, a site maintainer can
+% `enable' features of \ds{} that allow files to be written to
+% alternative directories.
+%
+% \DescribeMacro{\usedir}
+% Using this macro package author can tell where a file should be
+% installed. All |\file|s generated in the scope of that
+% declaration are written to a directory specified by its one
+% argument. For example in \LaTeXe{} installation following
+% declarations are used:
+%\begin{verbatim}
+% \usedir{tex/latex/base}
+% \usedir{makeindex}
+%\end{verbatim}
+% And standard packages use
+%\begin{verbatim}
+% \usedir{tex/latex/tools}
+% \usedir{tex/latex/babel}
+%\end{verbatim}
+% etc.
+%
+% \DescribeMacro{\showdirectory}
+% Used to display directory names in messages. If some label is not
+% defined it expands to |UNDEFINED (label is ...)| otherwise to a
+% directory name. It is probably a good idea for every installation
+% script to display at startup list of all directories that would
+% be used and asking user to confirm that.
+%
+% The above macros are used by package/installation script
+% author. The following macros are used in a configuration file,
+% |docstrip.cfg|, by a system administrator to
+% describe her/his local directory structure.
+%
+% \DescribeMacro{\BaseDirectory} This macro is administrator's way of
+% saying ``yes, I want to use that directories support of
+% yours''. \ds{} will write only to current directory unless your
+% config has a call to this macro. (This means \ds{} won't write to
+% random directories unless you tell it to, which is nice.) Using
+% this macro you can specify a base directory for \TeX-related
+% stuff. E.g., for many Unix systems that would be
+%\begin{verbatim}
+% \BaseDirectory{/usr/local/lib/texmf}
+%\end{verbatim}
+% and for standard em\TeX{} installation
+%\begin{verbatim}
+% \BaseDirectory{c:/emtex}
+%\end{verbatim}
+%
+% \DescribeMacro{\DeclareDir}
+% Having specified the base directory you should tell \ds{} how to
+% interpret labels used in |\usedir| commands. This is done with
+% |\DeclareDir| with two arguments. The first is the label and the
+% second is actual name of directory relative to base
+% directory. For example to teach \ds{} using standard em\TeX{}
+% directories one would say:
+%\begin{verbatim}
+% \BaseDirectory{c:/emtex}
+% \DeclareDir{tex/latex/base}{texinput/latex2e}
+% \DeclareDir{tex/latex/tools}{texinput/tools}
+% \DeclareDir{makeindex}{idxstyle}
+%\end{verbatim}
+% This will cause base latex files and font descriptions to be
+% written to directory |c:\emtex\texinput\latex2e|, files of
+% \texttt{tools} package to |c:\emtex\texinput\tools| and makeindex
+% files to |c:\emtex\idxstyle|.
+%
+% Sometimes it is desirable to put some files outside of the base
+% directory. For that reason |\DeclareDir| has a star form
+% specifying absolute pathname. For example one could say
+%\begin{verbatim}
+% \DeclareDir*{makeindex}{d:/tools/texindex/styles}
+%\end{verbatim}
+%
+% \DescribeMacro{\UseTDS}
+% Users of systems conforming to TDS may well ask here ``do I
+% really need to put a dozen of lines like
+%\begin{verbatim}
+% \DeclareDir{tex/latex/base}{tex/latex/base}
+%\end{verbatim}
+% in my config file''. The answer is |\UseTDS|. This macro causes
+% \ds{} to use labels themselves for any directory you haven't
+% overriden with |\DeclareDir|. The default behaviour is to raise
+% an error on undefined labels because some users may want to know
+% exactly where files go and not to allow \ds{} to write to random
+% places. However I (MW) think this is pretty cool and my
+% config says just (I'm running te\TeX{} under Linux)
+%\begin{verbatim}
+% \BaseDirectory{/usr/local/teTeX/texmf}
+% \UseTDS
+%\end{verbatim}
+%
+% The important thing to note here is that it is impossible to create
+% a new directory from inside \TeX{}. So however you configure
+% \ds, you need to create all needed directories before running
+% the installation. Authors may want to begin
+% every installation script by displaying a list of directories
+% that will be used and asking user if he's sure all of them
+% exist.
+%
+% Since file name syntax is OS specific \ds{} tries to guess it
+% from the current directory syntax. It should succeed for Unix,
+% MSDOS, Macintosh and VMS. However \ds{} will only initially
+% know the current directory syntax if it is used with \LaTeX.
+% If used with plain\TeX\ or initex it will not have this
+% information\footnote{Except when processing the main
+% \texttt{unpack.ins} batch file for the \LaTeX\ distribution, which
+% takes special measures so that initex can learn the directory
+% syntax.}.
+% If you often use \ds{} with formats other than \LaTeX\ you should
+% \emph{start} the file |docstrip.cfg| with a definition of
+% |\WriteToDir|. E.g.,
+% |\def\WriteToDir{./}| on MSDOS/Unix,
+% |\def\WriteToDir{:}| on Macintosh,
+% |\def\WriteToDir{[]}| on VMS.
+%
+% If your system requires something
+% completely different you can define in |docstrip.cfg| macros
+% |\dirsep| and |\makepathname|. Check for their definition in the
+% implementation part. If you want some substantially different
+% scheme of translating |\usedir| labels into directory names try
+% redefining macro |\usedir|.
+%
+% \subsection{Setting maximum numbers of streams}
+%
+% \DescribeMacro{\maxfiles}
+% In support of some of the more obscure operating systems, there's
+% a limit on the number of files a program can have open. This can
+% be expressed to \ds\ through the |\maxfiles| macro. If the number
+% of streams \ds\ is allowed to open is $n$, your configuration file
+% can say |\maxfiles{|$n$|}|, and \ds\ won't try to open more files
+% than this. Note that this limit won't include files which are
+% already open. There'll usually be two of these: the installation
+% script which you started, and the file |docstrip.tex| which it
+% included; you must bear these in mind yourself. \ds\ assumes
+% that it can open at least four files before it hits some kind of
+% maximum: if this isn't the case, you have real problems.
+%
+% \DescribeMacro{\maxoutfiles}
+% Maybe instead of having a limit on the number of files \TeX\ can
+% have open, there's a limit on the number of files it can write
+% to (e.g., \TeX\ itself imposes a limit of 16~files being written
+% at a time). This can be expressed by saying |\maxoutfiles{|$m$|}|
+% in a configuration file. You must be able to have at least one
+% output file open at a time; otherwise \ds\ can't do anything at
+% all.
+%
+% Both these options would typically be put in the |docstrip.cfg|
+% file.
+%
+%
+% \section{The user interface}
+%
+% \subsection{The main program}
+% \DescribeMacro{\processbatchFile} The `main program' starts with
+% trying to process a batch file, this is accomplished by calling
+% the macro |\processbatchFile|. It counts the number of batch
+% files it processes, so that when the number of files processed is
+% still zero after the call to |\processbatchFile| appropriate
+% action can be taken.
+%
+% \DescribeMacro{\interactive} When no batch files have been processed
+% the macro |\interactive| is called. It prompts the user for
+% information. First the extensions of the input and output files
+% is determined. Then a question about optional code is asked and
+% finally the user can give a list of files that have to be
+% processed.
+%
+% \DescribeMacro{\ReportTotals} When the \texttt{stats} option is
+% included in the \ds{}-program it keeps a record of the number of
+% files and lines that are processed. Also the number of comments
+% removed and passed as well as the number of code lines that were
+% passed to the output are accounted. The macro |\ReportTotals|
+% shows a summary of this information.
+%
+% \subsection{Batchfile commands}
+%
+% The commands described in this section are available to build a
+% batch file for \TeX.
+%
+% \DescribeMacro{\input}
+% All \ds{} batch files should start with the line: |\input docstrip|
+%
+% Do not use the \LaTeX\ syntax |\input{docstrip}| as batch files may
+% be used with plain~\TeX\ or ini\TeX.
+% You may that old batch files always have a line
+% |\def\batchfile{|\meta{filename}|}|
+% just before the input.
+% Such usage is still supported but is now discouraged, as it causes
+% \TeX\ to re-input the same file, using up one of its limited number
+% of input streams.
+%
+% \DescribeMacro{\endbatchfile}
+% All batch files should end with this command. Any lines after this
+% in the file are ignored. In old files that start
+% |\def\batchfile{|\ldots\ this command is optional, but is a good
+% idea anyway. If this command is omitted from a batchfile then
+% normally \TeX\ will go to its interactive |*| prompt, so you may
+% stop \ds{} by typing |\endbatchfile| to this prompt.
+%
+% \DescribeMacro{\generate}
+% \DescribeMacro{\file}
+% \DescribeMacro{\from}
+% The main reason for constructing a \ds{} command file is to
+% describe what files should be generated, from what sources and
+% what optional (`guarded') pieces of code should be included. The
+% macro |\generate| is used to give \TeX\ this information. Its
+% syntax is:
+% \begin{quote}
+% |\generate{|[|\file{|\meta{output}|}{|[|\from{|^^A
+% \meta{input}|}{|\meta{optionlist}|}|]*|}|]*|}|
+% \end{quote}
+% The \meta{output} and \meta{input} are normal file specifications
+% as are appropriate for your computer system. The
+% \meta{optionlist} is a comma separated list of `options' that
+% specify which optional code fragments in \meta{input} should be
+% included in \meta{output}. Argument to |\generate| may contain
+% some local declarations (e.g., the |\use...| commands described
+% below) that will apply to all |\file|s after them. Argument to
+% |\generate| is executed inside a group, so all local declarations
+% are undone when |\generate| concludes.
+%
+% It is possible to specify multiple input files, each with its own
+% \meta{optionlist}. This is indicated by the notation [\ldots]*.
+% Moreover there can be many |\file| specifications in one
+% |\generate| clause. This means that all these \meta{output} files
+% should be generated while reading each of \meta{input} files
+% once. Input files are read in order of first appearance in this
+% clause. E.g.
+%\begin{verbatim}
+% \generate{\file{p1.sty}{\from{s1.dtx}{foo,bar}}
+% \file{p2.sty}{\from{s2.dtx}{baz}
+% \from{s3.dtx}{baz}}
+% \file{p3.sty}{\from{s1.dtx}{zip}
+% \from{s2.dtx}{zip}}
+% }
+%\end{verbatim}
+% will cause \ds{} to read files \texttt{s1.dtx}, \texttt{s2.dtx},
+% \texttt{s3.dtx} (in that order) and produce files
+% \texttt{p1.sty}, \texttt{p2.sty}, \texttt{p3.sty}.
+%
+% The restriction to at most 16 output streams open in a while
+% does not mean that you can produce at most 16 files with one
+% |\generate|. In the example above only 2 streams are needed,
+% since while \texttt{s1.dtx} is processed only \texttt{p1.sty} and
+% \texttt{p3.sty} are being generated; while reading
+% \texttt{s2.dtx} only \texttt{p2.sty} and \texttt{p3.sty}; and
+% while reading \texttt{s3.dtx} file \texttt{p2.sty} . However
+% example below needs 3 streams:
+%\begin{verbatim}
+% \generate{\file{p1.sty}{\from{s1.dtx}{foo,bar}}
+% \file{p2.sty}{\from{s2.dtx}{baz}
+% \from{s3.dtx}{baz}}
+% \file{p3.sty}{\from{s1.dtx}{zip}
+% \from{s3.dtx}{zip}}
+% }
+%\end{verbatim}
+% Although while reading \texttt{s2.dtx} file \texttt{p3.sty} is
+% not written it must remain open since some parts of
+% \texttt{s3.dtx} will go to it later.
+%
+% Sometimes it is not possible to create a file by reading all
+% sources once. Consider the following example:
+%\begin{verbatim}
+% \generate{\file{p1.sty}{\from{s1.dtx}{head}
+% \from{s2.dtx}{foo}
+% \from{s1.dtx}{tail}}
+% \file{s1.drv}{\from{s1.dtx}{driver}}
+% }
+%\end{verbatim}
+% To generate \texttt{p1.sty} file \texttt{s1.dtx} must be read
+% twice: first time with option \texttt{head}, then file
+% \texttt{s2.dtx} is read and then \texttt{s1.dtx} again this time
+% with option \texttt{tail}. \ds{} handles this case correctly: if
+% inside one |\file| declaration there are multiple |\from|es with
+% the same input file this file \emph{is} read multiple times.
+%
+% If the order of |\from|s specified in one of your |\file|
+% specifications does not match the order of input files
+% established by previous |\file|s, \ds{} will raise an error and
+% abort. Then you may either read one of next sections or give up
+% and put that file in separate |\generate| (but then sources will
+% be read again just for that file).
+%
+% \paragraph{For impatient.} Try following algorithm: Find
+% file that is generated from largest number of sources, start
+% writing |\generate| clause with this file and its sources in
+% proper order. Take other files that are to be generated and add
+% them checking if they don't contradict order of sources for the
+% first one. If this doesn't work read next sections.
+%
+% \paragraph{For mathematicians.} Relation ``file $A$ must be
+% read before file $B$'' is a partial order on the set of all your
+% source files. Each |\from| clause adds a chain to this order.
+% What you have to do is to perform a topological sort i.e. to
+% extend partial order to linear one. When you have done it just
+% list your source files in |\generate| in such a way that order of
+% their first appearance in the clause matches linear order. If
+% this cannot be achieved read next paragraph. (Maybe future
+% versions of \ds{} will perform this sort automatically, so all
+% these troubles will disappear.)
+%
+% \paragraph{For that who must know that all.} There is a
+% diverse case when it's not possible to achieve proper order of
+% reading source files. Suppose you have to generate two files,
+% first from \texttt{s1.dtx} and \texttt{s3.dtx} (in that order)
+% and second from \texttt{s2.dtx} and \texttt{s3.dtx}. Whatever
+% way you specify this the files will be read in either as
+% \texttt{s1 s3 s2} or \texttt{s2 s3 s1}. The key to solution is
+% magical macro |\needed| that marks a file as needed to be input
+% but not directing any output from it to current |\file|. In our
+% example proper specification is:
+%\begin{verbatim}
+% \generate{\file{p1.sty}{\from{s1.dtx}{foo}
+% \needed{s2.dtx}
+% \from{s3.dtx}{bar}}
+% \file{p2.sty}{\from{s2.dtx}{zip}
+% \from{s3.dtx}{zap}}
+% }
+%\end{verbatim}
+%
+%
+% \DescribeMacro{\askforoverwritetrue}
+% \DescribeMacro{\askforoverwritefalse}
+% These macros specify what should happen if a file that is to be
+% generated already exists. If |\askforoverwritetrue| is active
+% (the default) the user is asked whether the file should be
+% overwritten. If however |\askforoverwritefalse| was issued
+% existing files will be overwritten silently. These switches are
+% local and can be issued in any place in the file even inside
+% |\generate| clause (between |\file|s however).
+%
+% \DescribeMacro{\askonceonly}
+% You might not want to set |\askforoverwritefalse| in a batch file
+% as that says that it us always all right to overwrite other people's
+% files. However for large installations, such as the base \LaTeX\
+% distribution, being asked individually about hundreds of files
+% is not very helpful either. A batchfile may therefore specify
+% |\askonceonly|. This means that after the first time the batchfile
+% asks the user a question, the user is given an option of to change
+% the behaviour so that `yes' will be automatically assumed for all
+% future questions. This applies to any use of the \ds{} commamnd
+% |\Ask| including, but not restricted to, the file overwrite
+% questions controlled by |\askforoverwritetrue|.
+%
+% \DescribeMacro{\preamble}
+% \DescribeMacro{\endpreamble}
+% \DescribeMacro{\postamble}
+% \DescribeMacro{\endpostamble}
+% It is possible to add a number of lines to the output of the
+% \ds{} program. The information you want to add to the start of
+% the output file should be listed between the |\preamble| and
+% |\endpreamble| commands; the lines you want to add to the end of
+% the output file should be listed between the |\postamble| and
+% |\endpostamble| commands. Everything that \ds{} finds for both
+% the pre- and postamble it writes to the output file, but preceded
+% with value of |\MetaPrefix| (default is two \%-characters). If
+% you include a |^^J| character in one of these lines, everything
+% that follows it on the same line is written to a new line in the
+% output file. This `feature' can be used to add a |\typeout| or
+% |\message| to the the stripped file.
+%
+% \DescribeMacro{\declarepreamble}
+% \DescribeMacro{\declarepostamble}
+% \DescribeMacro{\usepreamble}
+% \DescribeMacro{\usepostamble}
+% \DescribeMacro{\nopreamble}
+% \DescribeMacro{\nopostamble}
+% Sometimes it is desirable to have different preambles for different
+% files of a larger package (e.g., because some of them are
+% customisable configuration files and they should be marked as
+% such). In such a case one can say |\declarepreamble\somename|,
+% then type in his/her preamble, end it with |\endpreamble|,
+% and later on |\usepreamble\somename| to switch to this
+% preamble.
+% If no preamble should be used you can deploy the |\nopreamble|
+% command. This command is equivalent to saying |\usepreamble\empty|.
+% The same mechanism works for postambles, |\use...|
+% declarations are local and can appear inside |\generate|.
+%
+% Commands |\preamble| and |\postamble| define and activate
+% pre(post)ambles named |\defaultpreamble| and |\defaultpostamble|.
+%
+% \DescribeMacro{\batchinput}
+% The batch file commands can be put into several batch files which
+% are then executed from a master batch file. This is, for example,
+% useful if a distribution consists of several distinct parts. You
+% can then write individual batch files for every part and in
+% addition a master file that simply calls the batch files for the
+% parts. For this, call the individual batch files from the master
+% file with the command |\batchinput{|\meta{file}|}|. Don't use
+% |\input| for this purpose, this command
+% should be used only for calling the \ds{} program as explained
+% above and is ignored when used for any other purpose.
+%
+% \DescribeMacro{\ifToplevel}
+% When batch files are nested you may want to suppress certain
+% commands in the lower-level batch files such as terminal
+% messages. For this purpose you can use the |\ifToplevel| command
+% which executes its argument only if the current batch file is the
+% outermost one. Make sure that you put the opening brace of the
+% argument into the same line as the command itself, otherwise the
+% \ds{} program will get confused.
+%
+% \DescribeMacro{\showprogress}
+% \DescribeMacro{\keepsilent}
+% When the option \texttt{stats} is included in \ds{} it can
+% write message to the terminal as each line of the input file(s) is
+% processed. This message consists of a single character, indicating
+% kind of that particular line. We use the
+% following characters:
+% \begin{itemize}
+% \item[\texttt{\%}] Whenever an input line is a comment
+% \texttt{\%}-character is written to the terminal.
+% \item[\texttt{.}] Whenever a code line is encountered
+% a \texttt{.}-character is written on the terminal.
+% \item[\texttt{/}] When a number of empty lines appear in a row in the
+% input file, at most one of them is retained. The \ds{}
+% program signals the removal of an empty line with the
+% \texttt{/}-character.
+% \item[\texttt{<}] When a `guard line' is found in the input and it
+% starts a block of optionally included code, this is signalled
+% on the terminal by showing the \texttt{<}-character, together
+% with the boolean expression of the guard.
+% \item[\texttt{>}] The end of a conditionally included block of code is
+% indicated by showing the \texttt{>}-character.
+% \end{itemize}
+% This feature is turned on by default when the option
+% \texttt{stats} is included, otherwise it is turned off. The
+% feature can be toggled with the commands |\showprogress| and
+% |\keepsilent|.
+%
+%
+% \subsubsection{Supporting old interface}
+%
+% \DescribeMacro{\generateFile}
+% Here is the old syntax for specifing what files are to be
+% generated. It allows specification of just one output file.
+% \begin{quote}
+% |\generateFile{|\meta{output}|}{|\meta{ask}|}{|[|\from{|^^A
+% \meta{input}|}{|\meta{optionlist}|}|]*|}|
+% \end{quote}
+% The meaning of \meta{output}, \meta{input} and
+% \meta{optionslist} is just as for |\generate|. With
+% \meta{ask} you can instruct \TeX\ to either silently overwrite a
+% previously existing file (|f|) or to issue a warning and ask you
+% if it should overwrite the existing file (|t|) (it overrides the
+% |\askforoverwrite| setting).
+%
+% \DescribeMacro{\include}
+% \DescribeMacro{\processFile}
+% The earlier version of the \ds{} program supported a
+% different kind of command to tell \TeX\ what to do. This command
+% is less powerful than |\generateFile|; it can be used when
+% \meta{output} is created from one \meta{input}. The syntax is:
+% \begin{quote}
+% |\include{|\meta{optionlist}|}|
+%
+% |\processFile{|\meta{name}|}{|\meta{inext}^^A
+% |}{|\meta{outext}^^A
+% |}{|\meta{ask}|}|
+% \end{quote}
+% This command is based on environments where filenames are
+% constructed of two parts, the name and the extension, separated
+% with a dot. The syntax of this command assumes that the
+% \meta{input} and \meta{output} share the same name and only
+% differ in their extension. This command is retained to be
+% backwards compatible with the older version of \ds{}, but its use
+% is not encouraged.
+%
+% \section{Conditional inclusion of code}
+%
+% When you use the \ds{} program to strip comments out of
+% \TeX\ macro files you have the possibility to make more than one
+% stripped macro file from one documented file. This is achieved by
+% the support for optional code. The optional code is marked
+% in the documented file with a `guard'.
+%
+% A guard is a boolean expression that is enclosed in |<| and |>|.
+% It also {\em has\/} to follow the |%| at the beginning of the line.
+% For example:
+%\begin{verbatim}
+% ...
+% %<bool>\TeX code
+% ...
+%\end{verbatim}
+% In this example the line of code will be included in \meta{output}
+% if the option \texttt{bool} is present in the \meta{optionlist} of
+% the |\generateFile| command.
+%
+% The syntax for the boolean expressions is:
+%
+%\DeleteShortVerb\|
+% \begin{tabular}{lcl}
+% \meta{Expression} & $::=$ & \meta{Secondary}
+% [\{\texttt{|}, \texttt{,}\}
+% \meta{Secondary}]*\\
+% \meta{Secondary} & $::=$ &
+% \meta{Primary} [\texttt{\&}
+% \meta{Primary}]*\\
+% \meta{Primary} & $::=$ &
+% \meta{Terminal} $|$ \texttt{!}\meta{Primary}
+% $|$ \texttt{(}\meta{Expression}\texttt{)}\\
+% \end{tabular}
+%
+% The \texttt{|} stands for disjunction, the \texttt{\&} stands for
+% conjunction and the \texttt{!}\ stands for negation. The
+% \meta{Terminal} is any sequence of letters and evaluates to
+% \meta{true} iff\footnote{iff stands for `if and only if'} it
+% occurs in the list of options that have to be included.
+%\MakeShortVerb\|
+%
+% Two kinds of optional code are supported: one can either have
+% optional code that `fits' on one line of text, like the example
+% above, or one can have blocks of optional code.
+%
+% To distinguish both kinds of optional code the `guard modifier'
+% has been introduced. The `guard modifier' is one character that
+% immediately follows the |<| of the guard. It can be either |*|
+% for the beginning of a block of code, or |/| for the end of a
+% block of code\footnote{To be compatible with the earlier version
+% of \ds{} also \texttt{+} and \texttt{-} are supported as `guard
+% modifiers'. However, there is an incompatibility with the
+% earlier version since a line with a \texttt{+}-modified guard is
+% not included inside a block with a guard that evaluates to false,
+% in contrast to the previous behaviour.}. The beginning and
+% ending guards for a block of code have to be on a line by
+% themselves.
+%
+% When a block of code is {\em not\/} included, any guards that occur
+% within that block are {\em not\/} evaluated.
+%
+% \section{Those other languages}
+% Since \TeX\ is an open system some of \TeX\ packages include
+% non-\TeX\ files. Some authors use \ds\ to generate PostScript
+% headers, shell scripts or programs in other languages. For them
+% the comments-stripping activity of \ds\ may cause some
+% trouble. This section describes how to produce non-\TeX\ files
+% with \ds\ effectively.
+%
+% \subsection{Stuff \ds\ puts in every file}
+% First problem when producing files in ``other'' languages is that
+% \ds\ adds some bits to the begining and end of every generated
+% file that may not fit with the syntax of the language in
+% question. So we'll study carefully what exactly goes where.
+%
+% The whole text put on begining of file is kept in a macro defined
+% by |\declarepreamble|. Every line of input presented to
+% |\declarepreamble| is prepended with current value of
+% |\MetaPrefix|. Standard \ds\ header is inserted before your text,
+% and macros |\inFileName|, |\outFileName| and |\ReferenceLines|
+% are used as placeholders for information which will be filled in
+% later (specifically for each output file). Don't try to redefine
+% these macros. After
+%\begin{verbatim}
+% \declarepreamble\foo
+% ____________________________
+% Package FOO for use with TeX
+% \endpreamble
+%\end{verbatim}
+% macro |\foo| is defined as
+%\begin{verbatim}
+% %%^^J
+% %% This is file `\outFileName ',^^J
+% %% generated with the docstrip utility.^^J
+% \ReferenceLines^^J
+% %% ____________________________^^J
+% %% Package FOO for use with TeX.
+%\end{verbatim}
+% You can play with it freely or even define it from scratch. To
+% embed the preamble in Adobe structured comments just use |\edef|:
+%\begin{verbatim}
+% \edef\foo{\perCent!PS-Adobe-3.0^^J%
+% \DoubleperCent\space Title: \outFileName^^J%
+% \foo^^J%
+% \DoubleperCent\space EndComments}
+%\end{verbatim}
+% After that use |\usepreamble\foo| to select your new preamble.
+% Everything above works as well for postambles.
+%
+% You may also prevent \ds\ from adding anything to your file, and
+% put any language specific invocations directly in your code:
+%\begin{verbatim}
+% \generate{\usepreamble\empty
+% \usepostamble\empty
+% \file{foo.ps}{\from{mypackage.dtx}{ps}}}
+%\end{verbatim}
+% or alternatively |\nopreamble| and |\nopostamble|.
+%
+% \subsection{Meta comments}
+% You can change the prefix used for putting meta comments to
+% output files by redefining |\MetaPrefix|. Its default value is
+% |\DoubleperCent|. The preamble uses value of |\MetaPrefix|
+% current at time of |\declarepreamble| while meta comments in the
+% source file use value current at time of |\generate|. Note that
+% this means that you cannot produce concurrently two files using
+% different |\MetaPrefix|es.
+%
+% \subsection{Verbatim mode}
+% If your programming language uses some construct that can
+% interferes badly with \ds\ (e.g., percent in column one) you may
+% need a way for preventing it from being stripped off. For that
+% purpose \ds\ features `verbatim mode'.
+%
+% A `Guard expression' of the form |%<<|\meta{END-TAG} marks
+% the start of a section that will be copied verbatim upto a line
+% containing only a percent in column 1 followed by \meta{END-TAG}.
+% You can select any \meta{END-TAG} you want, but note that spaces
+% count here. Example:
+%\begin{verbatim}
+% %<*myblock>
+% some stupid()
+% #computer<program>
+% %<<COMMENT
+% % These two lines are copied verbatim (including percents
+% %% even if \MetaPrefix is something different than %%).
+% %COMMENT
+% using*strange@programming<language>
+% %</myblock>
+%\end{verbatim}
+% And the output is (when stripped with \texttt{myblock} defined):
+%\begin{verbatim}
+% some stupid()
+% #computer<program>
+% % These two lines are copied verbatim (including percents
+% %% even if \MetaPrefix is something different than %%).
+% using*strange@programming<language>
+%\end{verbatim}
+%
+%\StopEventually{%
+%^^A \section{Conclusion}
+% \PrintIndex
+% \PrintChanges
+%^^A \makesignature
+% }
+%
+% \section{Producing the documentation}
+%
+% We provide a short driver file that can be extracted by the
+% \ds{} program using the the conditional `\textsf{driver}'. To
+% allow the use of \texttt{docstrip.dtx} as a program at Ini\TeX{}
+% time (e.g., to strip
+% off its own comments) we need to add a bit of primitive code.
+% With this extra checking it is still possible to process this
+% file with \LaTeXe{} to typeset the documentation.
+% \changes{2.1b}{1993/02/23}{Added fontdefinitions for doc to the driver
+% file, in order to get the layout of the code
+% right; also added the layout definitions
+% that are in effect in \texttt{doc.drv}}
+% \changes{2.1c}{1993/02/23}{Remove definitions for fonts again}
+% \changes{2.2f}{1994/02/26}{Allow direct processing of source}
+% \begin{macrocode}
+%<*driver>
+% \end{macrocode}
+% If |\documentclass| is undefined, e.g., if Ini\TeX{} or plain
+% \TeX{} is used for formatting, we bypass the driver file.
+%
+% \changes{2.3a}{1995/08/20}{Changed driver}
+% We use some trickery to avoid issuing |\end{document}| when
+% the |\ifx| construction is unfinished. If condition below is
+% true a |\fi| is constructed on the fly, the |\ifx| is completed,
+% and the real |\fi| will never be seen as it comes after
+% |\end{document}|. On the other hand if condition is false
+% \TeX\ skips over |\csname fi\endcsname| having no idea that
+% this could stand for |\fi|, driver is skipped and only then
+% the condition completed.
+%
+% Additional guard |gobble| prevents \ds\ from extracting
+% these tricks to real driver file.
+% \begin{macrocode}
+%<*gobble>
+\ifx\jobname\relax\let\documentclass\undefined\fi
+\ifx\documentclass\undefined
+\else \csname fi\endcsname
+%</gobble>
+% \end{macrocode}
+% Otherwise we process the following lines which will result in
+% formatting the documentation.
+% \begin{macrocode}
+ \documentclass{ltxdoc}
+ \EnableCrossrefs
+ % \DisableCrossrefs
+ % use \DisableCrossrefs if the
+ % index is ready
+ \RecordChanges
+ % \OnlyDescription
+ \typeout{Expect some Under- and overfull boxes}
+ \begin{document}
+ \DocInput{docstrip.dtx}
+ \end{document}
+%<*gobble>
+\fi
+%</gobble>
+%</driver>
+% \end{macrocode}
+%
+%
+% \section{The implementation}
+%
+% \subsection{Initex initializations}
+% Allow this program to run with |initex|.
+% The |Z| trickery saves the need to worry about |\outer| stuff in
+% plain \TeX.
+% \begin{macrocode}
+%<*initex>
+\catcode`\Z=\catcode`\%
+\ifnum13=\catcode`\~{\egroup\else
+ \catcode`\Z=9
+Z
+Z \catcode`\{=1 \catcode`\}=2
+Z \catcode`\#=6 \catcode`\^=7
+Z \catcode`\@=11 \catcode`\^^L=13
+Z \let\bgroup={ \let\egroup=}
+Z
+Z \dimendef\z@=10 \z@=0pt \chardef\@ne=1 \countdef\m@ne=22 \m@ne=-1
+Z \countdef\count@=255
+Z
+Z \def\wlog{\immediate\write\m@ne} \def\space{ }
+Z
+Z \count10=22 % allocates \count registers 23, 24, ...
+Z \count15=9 % allocates \toks registers 10, 11, ...
+Z \count16=-1 % allocates input streams 0, 1, ...
+Z \count17=-1 % allocates output streams 0, 1, ...
+Z
+Z \def\alloc@#1#2#3{\advance\count1#1\@ne#2#3\count1#1\relax}
+Z
+Z \def\newcount{\alloc@0\countdef} \def\newtoks{\alloc@5\toksdef}
+Z \def\newread{\alloc@6\chardef} \def\newwrite{\alloc@7\chardef}
+Z
+Z \def\newif#1{%
+Z \count@\escapechar \escapechar\m@ne
+Z \let#1\iffalse
+Z \@if#1\iftrue
+Z \@if#1\iffalse
+Z \escapechar\count@}
+Z \def\@if#1#2{%
+Z \expandafter\def\csname\expandafter\@gobbletwo\string#1%
+Z \expandafter\@gobbletwo\string#2\endcsname
+Z {\let#1#2}}
+Z
+Z \def\@gobbletwo#1#2{}
+Z \def\@gobblethree#1#2#3{}
+Z
+Z \def\loop#1\repeat{\def\body{#1}\iterate}
+Z \def\iterate{\body \let\next\iterate \else\let\next\relax\fi \next}
+Z \let\repeat\fi
+Z
+Z \def\empty{}
+Z
+Z \def\tracingall{\tracingcommands2 \tracingstats2
+Z \tracingpages1 \tracingoutput1 \tracinglostchars1
+Z \tracingmacros2 \tracingparagraphs1 \tracingrestores1
+Z \showboxbreadth 10000 \showboxdepth 10000 \errorstopmode
+Z \errorcontextlines 10000 \tracingonline1 }
+Z
+\bgroup}\fi\catcode`\Z=11
+\let\bgroup={ \let\egroup=}
+%</initex>
+% \end{macrocode}
+%
+% \subsection{Declarations and initializations}
+%
+% In order to be able to include the \texttt{@}-sign in control
+% sequences its category code is changed to \meta{letter}. The
+% `program' guard here allows most of the code to be excluded when
+% extracting the driver file.
+% \begin{macrocode}
+%<*program>
+\catcode`\@=11
+% \end{macrocode}
+%
+% When we want to write multiple lines to the terminal with one
+% statement, we need a character that tells \TeX\ to break the lines.
+% We use \verb=^^J= for this purpose.
+% \begin{macrocode}
+\newlinechar=`\^^J
+% \end{macrocode}
+%
+% \subsubsection{Switches}
+% \begin{macro}{\ifGenerate}
+% The program will check if a
+% file of the same name as the file it would be creating already
+% exists. The switch |\ifGenerate| is used to indicate if the
+% stripped file has to be generated.
+% \begin{macrocode}
+\newif\ifGenerate
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifContinue}
+% The switch |\ifContinue| is used in various places in the
+% program to indicate if a |\loop| has to end.
+% \begin{macrocode}
+\newif\ifContinue
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifForlist}
+% \changes{2.0g}{1991/06/05}{Macro added.}
+% The program contains an implementation of a for-loop, based on
+% plain \TeX{}'s |\loop| macros. The implementation needs a
+% switch to terminate the loop.
+% \begin{macrocode}
+\newif\ifForlist
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifDefault}
+% The switch |\ifDefault| is used to indicate whether the
+% default batch file has to be used.
+% \changes{2.0f}{1991/06/04}{Macro added.}
+% \begin{macrocode}
+\newif\ifDefault
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifMoreFiles}
+% The switch |\ifMoreFiles| is used to decide if the user
+% wants more files to be processed. It is used only in interactive
+% mode; initially it evaluates to \meta{true}.
+% \changes{2.0h}{1991/06/19}{Macro added.}
+% \begin{macrocode}
+\newif\ifMoreFiles \MoreFilestrue
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\ifaskforoverwrite}
+% The switch |\askforoverwrite| is used to decide if the user
+% should be asked when a file is to be overwritten.
+% \begin{macrocode}
+\newif\ifaskforoverwrite \askforoverwritetrue
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Count registers}
+% \begin{macro}{\blockLevel}
+% Optionally included blocks of code can be nested. The counter
+% |\blockLevel| will be used to keep track of the level of
+% nesting. Its initial value is zero.
+% \begin{macrocode}
+\newcount\blockLevel \blockLevel\z@
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\emptyLines}
+% The count register |\emptyLines| is used to count the number
+% of consecutive empty input lines. Only the first will be copied
+% to the output file.
+% \changes{2.0i}{1990/06/27}{Macro added}
+% \begin{macrocode}
+\newcount\emptyLines \emptyLines \z@
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\processedLines}
+% \begin{macro}{\commentsRemoved}
+% \begin{macro}{\commentsPassed}
+% \begin{macro}{\codeLinesPassed}
+% To be able to provide the user with some statistics about the
+% stripping process four counters are allocated if the statistics
+% have been included when this program was \ds{}ped. The number of
+% lines processed is stored in the counter |\processedLines|.
+% The number of lines containing comments that are not written on
+% the output file is stored in the counter |\commentsRemoved|;
+% the number of comments copied to the output file is stored in the
+% counter |\commentsPassed|. The number of lines containing
+% macro code that are copied to the output file is stored in the
+% counter |\codeLinesPassed|.
+% \begin{macrocode}
+%<*stats>
+\newcount\processedLines \processedLines \z@
+\newcount\commentsRemoved \commentsRemoved \z@
+\newcount\commentsPassed \commentsPassed \z@
+\newcount\codeLinesPassed \codeLinesPassed \z@
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \changes{2.0e}{1991/05/31}{Added counter allocation for the processing
+% of multiple files}
+% \begin{macro}{\TotalprocessedLines}
+% \begin{macro}{\TotalcommentsRemoved}
+% \begin{macro}{\TotalcommentsPassed}
+% \begin{macro}{\TotalcodeLinesPassed}
+% When more than one file is processed and when statistics have
+% been included we provide the user also with information about the
+% total amount of lines processed. For this purpose four more count
+% registers are allocated here.
+% \begin{macrocode}
+\newcount\TotalprocessedLines \TotalprocessedLines \z@
+\newcount\TotalcommentsRemoved \TotalcommentsRemoved \z@
+\newcount\TotalcommentsPassed \TotalcommentsPassed \z@
+\newcount\TotalcodeLinesPassed \TotalcodeLinesPassed \z@
+%</stats>
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\NumberOfFiles}
+% When more than one file is processed, the number of files is
+% stored in the count register |\NumberOfFiles|.
+% \changes{2.4h}{1997/07/07}{Declare counter always pr/2429}
+% \begin{macrocode}
+\newcount\NumberOfFiles \NumberOfFiles\z@
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{I/O streams}
+% \begin{macro}{\inFile}
+% For reading the file with documented \TeX-code, an input stream
+% |\inFile| is allocated.
+% \begin{macrocode}
+\newread\inFile
+% \end{macrocode}
+% \end{macro}
+%
+% \changes{2.3a}{1995/08/18}{No allocated streams for console}
+% \begin{macro}{\ttyin}
+% \begin{macro}{\ttyout}
+% Communication with the user goes through (nonexistent) stream 16.
+% \begin{macrocode}
+\chardef\ttyin16
+\chardef\ttyout16
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\inputcheck}
+% This stream is only used for checking for existence of files.
+% \begin{macrocode}
+\newread\inputcheck
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ifToplevel}
+% Execute the argument if current batch file is the outermost one.
+% Otherwise suppress it.
+% \begin{macrocode}
+\newif\iftopbatchfile \topbatchfiletrue
+\def\ifToplevel{\relax\iftopbatchfile
+ \expandafter\iden \else \expandafter\@gobble\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\batchinput}
+% \changes{2.0n}{1992/04/26}{Added macro}
+% \changes{2.1a}{1993/02/22}{Completely redefined (so that it works)}
+%
+% When the file \texttt{docstrip.tex} is read because of an
+% |\input| statement in a batch file we have to prevent an
+% endless loop (well, limited by \TeX's stack). Therefore we save
+% the original primitive |\input| and define a new macro with
+% an argument delimited by \verb*= = (i.e.\ a space) that just
+% gobbles the argument. Since the end-of-line character is
+% converted by \TeX{} to a space. This means that |\input| is not
+% available as a command within batch files.
+%
+% \begin{macro}{\@@input}
+% \changes{2.1a}{1993/02/22}{Macro added}
+% We therefore keep a copy of the original under the name
+% |\@@input| for internal use. If \ds{} runs under \LaTeX{} this
+% command is already defined, so we make a quick test.
+% \begin{macrocode}
+\ifx\undefined\@@input \let\@@input\input\fi
+% \end{macrocode}
+% \end{macro}
+%
+% To allow the nesting of batch files the |\batchinput| command is
+% provided it takes one argument, the name of the batch file to
+% switch to.
+% \begin{macrocode}
+\def\batchinput#1{%
+% \end{macrocode}
+% We start a new group and locally redefine |\batchFile| to hold
+% the new batch file name. We toggle the |\iftopbatchfile| switch
+% since this definitely is not top batch file.
+% \begin{macrocode}
+ \begingroup
+ \def\batchfile{#1}%
+ \topbatchfilefalse
+ \Defaultfalse
+ \usepreamble\org@preamble
+ \usepostamble\org@postamble
+ \let\destdir\WriteToDir
+% \end{macrocode}
+% After this we can simply call |\processbatchFile| which will
+% open the new batch file and read it until it
+% is exhausted. Note that if the batch file is not available, or
+% misspelled this routine will produce a warning and return.
+% \begin{macrocode}
+ \processbatchFile
+% \end{macrocode}
+% The value of |\batchfile| as well as local definitions of
+% preambles, directories etc. will be restored
+% at this closing |\endgroup|, so that further processing
+% continues in the calling batch file.
+% \begin{macrocode}
+ \endgroup
+}
+% \end{macrocode}
+% \begin{macro}{\skip@input}
+% \changes{2.0j}{1992/03/03}{Added macro}
+% \changes{2.0n}{1992/04/26}{Argument delimited by space not \cs{relax}}
+% \changes{2.0n}{1992/04/26}{Macro renamed from \cs{skipinput}}
+% And here is the promised redefinition of |\input|:
+% \begin{macrocode}
+\def\skip@input#1 {}
+\let\input\skip@input
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \subsubsection{Empty macros and macros that expand to a string}
+% \begin{macro}{\guardStack}
+% \changes{2.0k}{1992/04/06}{Renamed from \texttt{\bsl blockStack}}
+% Because blocks of code that will conditionally be included in the
+% output can be nested, a stack is maintained to keep track of
+% these blocks. The main reason for this is that we want to be able
+% to check if the blocks are properly nested. The stack itself is
+% stored in |\guardStack|.
+% \begin{macrocode}
+\def\guardStack{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\blockHead}
+% The macro |\blockHead| is used for storing and retrieving
+% the boolean expression that starts a block.
+% \begin{macrocode}
+\def\blockHead{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\yes}
+% \begin{macro}{\y}
+% When the user is asked a question that he has to answer with either
+% \meta{yes} or \meta{no}, his response has to be evaluated. For this
+% reason the macros |\yes| and |\y| are defined.
+% \begin{macrocode}
+\def\yes{yes}
+\def\y{y}
+% \end{macrocode}
+% \begin{macro}{\n}
+% We also define |\n| for use in \ds{} command files.
+% \changes{2.1e}{1993/03/09}{Macro added}
+% \begin{macrocode}
+\def\n{n}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\Defaultbatchile}
+% \changes{2.0f}{1991/06/04}{Macro added.}
+% When the \ds{} program has to process a batch file it
+% can look for a batch file with a default name. This name
+% is stored in |\DefaultbatchFile|.
+% \begin{macrocode}
+\def\DefaultbatchFile{docstrip.cmd}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\perCent}
+% \begin{macro}{\DoubleperCent}
+% \begin{macro}{\MetaPrefix}
+% To be able to display percent-signs on the terminal, a
+% \texttt{\%} with category code 12 is stored in |\perCent| and
+% |\DoubleperCent|. The macro |\MetaPrefix| is put on begining of
+% every meta-comment line. It is defined indirect way since some
+% applications need redefining it.
+% \begin{macrocode}
+{\catcode`\%=12
+ \gdef\perCent{%}
+ \gdef\DoubleperCent{%%}
+}
+\let\MetaPrefix\DoubleperCent
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+% In order to allow formfeeds in the input we define a one-character
+% control sequence \verb=^^L=.
+% \begin{macrocode}
+\def^^L{ }
+% \end{macrocode}
+%
+% The only result of using |\Name| is slowing down execution since
+% its typical use (e.g., |\Name\def{foo bar}...|) has exactly the
+% same number of tokens as its expansion. However I think that it's
+% easier to read. The meaning of |\Name| as a black box is:
+% ``construct a name from second parameter and then pass it to your
+% first parameter as a parameter''.
+%
+% |\@stripstring| is used to get tokens building name of a macro
+% without leading backslash.
+% \begin{macrocode}
+\def\Name#1#2{\expandafter#1\csname#2\endcsname}
+\def\@stripstring{\expandafter\@gobble\string}
+% \end{macrocode}
+%
+% \subsubsection{Miscellaneous variables}
+% \begin{macro}{\sourceFileName}
+% The macro |\sourceFileName| is used to store the name of the
+% current input file.
+% \end{macro}
+% \begin{macro}{\batchfile}
+% The macro |\batchfile| is used to store the name of the
+% batch file.
+% \end{macro}
+% \begin{macro}{\inLine}
+% The macro |\inLine| is used to store the lines, read from
+% the input file, before further processing.
+% \end{macro}
+% \begin{macro}{\answer}
+% When some interaction with the user is needed the macro
+% |\answer| is used to store his response.
+% \end{macro}
+% \begin{macro}{\tmp}
+% Sometimes something has to be temporarily stored in a control
+% sequence. For these purposes the control sequence |\tmp| is
+% used.
+% \end{macro}
+%
+% \subsection{Support macros}
+% \subsubsection{The stack mechanism}
+%
+% It is possible to have `nested guards'. This means that within a
+% block of optionally included code a subgroup is only included
+% when an additional option is specified. To keep track of the
+% nesting of the guards the currently `open' guard can be pushed on
+% the stack |\guardStack| and later popped off the stack again. The
+% macros that implement this stack mechanism are loosely based on
+% code that is developed in the context of the \LaTeX3 project.
+%
+% To be able to implement a stack mechanism we need a couple of
+% support macros.
+% \begin{macro}{\eltStart}
+% \changes{2.0k}{1992/04/06}{Macro added}
+% \begin{macro}{\eltEnd}
+% \changes{2.0k}{1992/04/06}{Macro added}
+% The macros |\eltStart| and |\eltEnd| are used to delimit a stack
+% element. They are both empty.
+% \begin{macrocode}
+\def\eltStart{}
+\def\eltEnd{}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\qStop}
+% \changes{2.0k}{1992/04/06}{Macro added}
+% The macro |\qStop| is a so-called `quark', a macro that expands to
+% itself\footnote{The concept of `quarks' is developed for the
+% \LaTeX3 project.}.
+% \begin{macrocode}
+\def\qStop{\qStop}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\pop}
+% \changes{2.0k}{1992/04/06}{Macro added} The macro
+% |\pop|\meta{stack}\meta{cs} `pops' the top element from the
+% stack. It assigns the value of the top element to \meta{cs} and
+% removes it from \meta{stack}. When \meta{stack} is empty a
+% warning is issued and \meta{cs} is assigned an empty value.
+% \begin{macrocode}
+\def\pop#1#2{%
+ \ifx#1\empty
+ \Msg{Warning: Found end guard without matching begin}%
+ \let#2\empty
+ \else
+% \end{macrocode}
+% To be able to `peel' off the first guard we use an extra macro
+% |\popX| that receives both the expanded and the unexpanded stack
+% in its arguments. The expanded stack is delimited with the quark
+% |\qStop|.
+% \begin{macrocode}
+ \def\tmp{\expandafter\popX #1\qStop #1#2}%
+ \expandafter\tmp\fi}
+% \end{macrocode}
+% \begin{macro}{\popX}
+% \changes{2.0k}{1992/04/06}{Macro added} When the stack is expanded
+% the elements are surrounded with |\eltStart| and |\eltEnd|. The
+% first element of the stack is assigned to |#4|.
+% \begin{macrocode}
+\def\popX\eltStart #1\eltEnd #2\qStop #3#4{\def#3{#2}\def#4{#1}}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\push}
+% \changes{2.0k}{1992/04/06}{Macro added}
+% Guards can be pushed on the stack using the macro
+% |\push|\meta{stack}\meta{guard}. Again we need a secondary macro
+% (|\pushX|) that has both the expanded and the unexpanded stack as
+% arguments.
+% \begin{macrocode}
+\def\push#1#2{\expandafter\pushX #1\qStop #1{\eltStart #2\eltEnd}}
+% \end{macrocode}
+% \begin{macro}{\pushX}
+% \changes{2.0k}{1992/04/06}{Macro added}
+% The macro |\pushX| picks up the complete expansion of the stack as
+% its first argument and places the guard in |#3| on the `top'.
+% \begin{macrocode}
+\def\pushX #1\qStop #2#3{\def #2{#3#1}}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \subsubsection{Programming structures}
+%
+% \begin{macro}{\forlist}
+% \changes{2.0g}{1991/06/05}{Macro added.}
+% When the program is used in interactive mode the
+% user can supply a list of files that have to be processed.
+% In order to process this list a for-loop is needed. This
+% implementation of such a programming construct is based on the
+% use of the \verb=\loop{=\meta{body}\verb=}\repeat= macro that
+% is defined in plain \TeX\@. The syntax for this loop is:
+% \begin{flushleft}
+% |\for|\meta{control sequence} |:=| \meta{list}
+% |\do|\\
+% \meta{body}\\
+% |\od|
+% \end{flushleft}
+% The \meta{list} should be a comma separated list.
+%
+% The first actions that have to be taken are to set the switch
+% |\ifForlist| to \meta{true} and to store the loop condition
+% in the macro |\ListCondition|. This is done using an
+% |\edef| to allow for a control sequence that contains a
+% \meta{list}.
+% \begin{macrocode}
+\def\forlist#1:=#2\do#3\od{%
+ \edef\ListCondition{#2}%
+ \Forlisttrue
+% \end{macrocode}
+% Then we start the loop.
+% We store the first element from the |\ListCondition| in the
+% macro that was supplied as the first argument to |\forlist|.
+% This element is then removed from the |\ListCondition|.
+% \begin{macrocode}
+ \loop
+ \edef#1{\expandafter\FirstElt\ListCondition,\empty.}%
+ \edef\ListCondition{\expandafter\OtherElts\ListCondition,\empty.}%
+% \end{macrocode}
+% When the first element from the \meta{list} is empty, we are done
+% processing, so we switch |\ifForlist| to \meta{false}.
+% When it is not empty we execute the third argument that should
+% contain \TeX\ commands to execute.
+% \begin{macrocode}
+ \ifx#1\empty \Forlistfalse \else#3\fi
+% \end{macrocode}
+% Finally we test the switch |\ifForlist| to decide whether the
+% loop has to be continued.
+% \begin{macrocode}
+ \ifForlist
+ \repeat}
+% \end{macrocode}
+% \begin{macro}{\FirstElt}
+% \changes{2.0g}{1991/06/05}{Macro added.}
+% The macro |\FirstElt| is used to get the first element from a
+% comma-separated list.
+% \begin{macrocode}
+\def\FirstElt#1,#2.{#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\OtherElts}
+% \changes{2.0g}{1991/06/05}{Macro added.}
+% The macro |\OtherElts| is used to get all elements {\em but\/}
+% the first element from a comma-separated list.
+% \begin{macrocode}
+\def\OtherElts#1,#2.{#2}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\whileswitch}
+% \changes{2.0h}{1991/06/19}{Macro added.} When the program is used in
+% interactive mode the user might want to process several files
+% with different options or extensions. This goal could be reached
+% by running the program several times, but it is more
+% user-friendly to ask if he would like to process more files when
+% we are done processing his last request. To accomplish this we
+% need the implementation of a \texttt{while}-loop. Again plain
+% \TeX's \verb=\loop{=\meta{body}\verb=}\repeat= is used to
+% implement this programming structure.
+%
+% The syntax for this loop is:
+% \begin{flushleft}
+% |\whileswitch|\meta{switch} \verb|\fi| \meta{list}
+% \verb={=\meta{body}\verb=}=\\
+% \end{flushleft}
+% The first argument to this macro has to be a switch, defined
+% using |\newif|; the second argument contains the statements
+% to execute while the switch evaluates to \meta{true}.
+% \begin{macrocode}
+\def\whileswitch#1\fi#2{#1\loop#2#1\repeat\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \changes{2.3a}{1995/08/18}{New mechanism: output streams allocation}
+%
+% \subsubsection{Output streams allocator}
+%
+% For each of sixteen output streams available we have a macro
+% named |\s@0| through |\s@15| saying if the stream is assigned to a
+% file~(1) or not~(0). Initially all streams are not assigned.
+%
+% We also declare 16 counters which will be needed by the conditional
+% code inclusion algorithm.
+%
+% \begin{macrocode}
+\ifx\@tempcnta\undefined \newcount\@tempcnta \fi
+\@tempcnta=0
+\loop
+\Name\chardef{s@\number\@tempcnta}=0
+\csname newcount\expandafter\endcsname%
+ \csname off@\number\@tempcnta\endcsname
+\advance\@tempcnta1
+\ifnum\@tempcnta<16\repeat
+% \end{macrocode}
+%
+% We will use \emph{The \TeX book} style list to search through streams.
+%
+% \begin{macrocode}
+\let\s@do\relax
+\edef\@outputstreams{%
+ \s@do\Name\noexpand{s@0}\s@do\Name\noexpand{s@1}%
+ \s@do\Name\noexpand{s@2}\s@do\Name\noexpand{s@3}%
+ \s@do\Name\noexpand{s@4}\s@do\Name\noexpand{s@5}%
+ \s@do\Name\noexpand{s@6}\s@do\Name\noexpand{s@7}%
+ \s@do\Name\noexpand{s@8}\s@do\Name\noexpand{s@9}%
+ \s@do\Name\noexpand{s@10}\s@do\Name\noexpand{s@11}%
+ \s@do\Name\noexpand{s@12}\s@do\Name\noexpand{s@13}%
+ \s@do\Name\noexpand{s@14}\s@do\Name\noexpand{s@15}%
+ \noexpand\@nostreamerror
+ }
+% \end{macrocode}
+%
+% \begin{macro}{\@nostreamerror}\begin{macro}{\@streamfound}
+% When |\@outputstreams| is executed |\s@do| is defined to do
+% something on condition of some test. If condition
+% always fails macro |\@nostreamerror| on the end of the list
+% causes an error. When condition succeeds |\@streamfound| is
+% called, which gobbles rest of the list including the ending
+% |\@nostreamerror|. It also gobbles |\fi| ending the condition, so
+% the |\fi| is reinserted.
+%
+% \begin{macrocode}
+\def\@nostreamerror{\errmessage{No more output streams!}}
+\def\@streamfound#1\@nostreamerror{\fi}
+% \end{macrocode}
+% \end{macro}\end{macro}
+%
+% |\@stripstr| is auxiliary macro eating characters |\s@|
+% (backslash,s,@). It is defined in somewhat strange way since |\s@|
+% must have all category code 12 (other). This macro is used to
+% extract stream numbers from stream names.
+%
+% \begin{macrocode}
+\bgroup\edef\x{\egroup
+ \def\noexpand\@stripstr\string\s@{}}
+\x
+% \end{macrocode}
+%
+% \begin{macro}{\StreamOpen}\begin{macro}{\StreamPut}
+% \begin{macro}{\StreamClose}
+% Here is stream opening operator. Its parameter should be a macro
+% named the same as the external file being opened. E.g., to
+% write to file |foo.tex| use |\StreamOpen\foo|, then
+% |\StreamPut\foo| and |\StreamClose\foo|.
+%
+% \begin{macrocode}
+\chardef\stream@closed=16
+\def\StreamOpen#1{%
+ \chardef#1=\stream@closed
+ \def\s@do##1{\ifnum##1=0
+ \chardef#1=\expandafter\@stripstr\string##1 %
+ \global\chardef##1=1 %
+ \immediate\openout#1=\csname pth@\@stripstring#1\endcsname %
+ \@streamfound
+ \fi}
+ \@outputstreams
+ }
+\def\StreamClose#1{%
+ \immediate\closeout#1%
+ \def\s@do##1{\ifnum#1=\expandafter\@stripstr\string##1 %
+ \global\chardef##1=0 %
+ \@streamfound
+ \fi}
+ \@outputstreams
+ \chardef#1=\stream@closed
+ }
+\def\StreamPut{\immediate\write}
+% \end{macrocode}
+% \end{macro}\end{macro}\end{macro}
+%
+% \subsubsection{Input and Output}
+%
+% \begin{macro}{\maybeMsg}
+% \begin{macro}{\showprogress}
+% \begin{macro}{\keepsilent}
+% When this program is used it can optionally show its progress on
+% the terminal. In that case it will write a special character to
+% the terminal (and the transcript file) for each input line. This
+% option is on by default when statistics are included in
+% \texttt{docstrip.tex}. It is off when statistics are excluded. The
+% commands |\showprogress| and |\keepsilent| can be used
+% to choose otherwise.
+% \begin{macrocode}
+\def\showprogress{\let\maybeMsg\message}
+\def\keepsilent{\let\maybeMsg\@gobble}
+%<*stats>
+\showprogress
+%</stats>
+%<-stats>\keepsilent
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\Msg}
+% For displaying messages on the terminal the macro |\Msg| is
+% defined to write {\em immediately\/} to |\ttyout|.
+% \begin{macrocode}
+\def\Msg{\immediate\write\ttyout}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Ask}
+% The macro
+% \verb=\Ask{=\meta{cs}\verb=}{=\meta{string}\verb=}= is a
+% slightly modified copy of the \LaTeX\ macro |\typein|. It is
+% used to ask the user a question. The \meta{string} will be
+% displayed on his terminal and the response will be stored in the
+% \meta{cs}. The trailing space left over from the carriage return
+% is stripped off by the macro |\strip|. If the user just
+% types a carriage return, the result will be an empty macro.
+% \changes{2.0i}{1991/06/27}{Added check for just \protect\meta{CR}}
+% \begin{macrocode}
+\def\iden#1{#1}
+\def\strip#1#2 \@gobble{\def #1{#2}}
+\def\@defpar{\par}
+\def\Ask#1#2{%
+ \message{#2}\read\ttyin to #1\ifx#1\@defpar\def#1{}\else
+ \iden{\expandafter\strip
+ \expandafter#1#1\@gobble\@gobble} \@gobble\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\OriginalAsk}
+% \changes{2.4e}{1996/10/24}{macro added (was in unpack.ins) (DPC)}
+% \begin{macrocode}
+\let\OriginalAsk=\Ask
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\askonceonly}
+% \changes{2.4e}{1996/10/22}
+% {macro added (essentially from unpack.ins) (DPC)}
+% \begin{macrocode}
+\def\askonceonly{%
+ \def\Ask##1##2{%
+ \OriginalAsk{##1}{##2}%
+ \global\let\Ask\OriginalAsk
+ \Ask\noprompt{%
+ By default you will be asked this question for every file.^^J%
+ If you enter `y' now,^^J%
+ I will asssume `y' for all future questions^^J%
+ without prompting.}%
+ \ifx\y\noprompt\let\noprompt\yes\fi
+ \ifx\yes\noprompt\gdef\Ask####1####2{\def####1{y}}\fi}}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Miscellaneous}
+%
+% \begin{macro}{\@gobble}
+% \changes{2.0a}{1991/05/25}{Macro added.}
+% A macro that has an argument and puts it in the bitbucket.
+% \begin{macrocode}
+\def\@gobble#1{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Endinput}
+% \changes{2.0f}{1991/06/04}{Macro added.} When a \texttt{doc} file
+% contains a \verb+\endinput+ on a line by itself this normally
+% means that anything following in this file should be ignored.
+% Therefore we need a macro containing |\endinput| as its
+% replacement text to check this against |\inLine| (the
+% current line from the current input file). Of course the
+% backslash has to have the correct |\catcode|. One way of
+% doing this is feeding \verb=\\= to the |\string| operation
+% and afterwards removing one of the |\| characters.
+% \begin{macrocode}
+\edef\Endinput{\expandafter\@gobble\string\\endinput}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\makeOther}
+% During the process of reading a file with \TeX\ code the category
+% code of all special characters has to be changed to \meta{other}.
+% The macro |\makeOther| serves this purpose.
+% \begin{macrocode}
+\def\makeOther#1{\catcode`#1=12\relax}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\end}
+% \changes{2.0h}{1991/06/19}{Macro added.} For now we want the \ds{}
+% program to be compatible with both plain \TeX\ and \LaTeX\@.
+% \LaTeX\ hides plain \TeX{}'s |\end| command and
+% calls it |\@@end|. We unhide it here.
+% \begin{macrocode}
+\ifx\undefined\@@end\else\let\end\@@end\fi
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@addto}
+% A macro extending macro's definition. The trick with |\csname|
+% is necessary to get around |\newtoks| being outer in plain \TeX{}
+% and \LaTeX\ version 2.09.
+% \begin{macrocode}
+\ifx\@temptokena\undefined \csname newtoks\endcsname\@temptokena\fi
+% \end{macrocode}
+%
+% \begin{macrocode}
+\def\@addto#1#2{%
+ \@temptokena\expandafter{#1}%
+ \edef#1{\the\@temptokena#2}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@ifpresent}
+% This macro checks if its first argument is present on a
+% list passed as the second argument. Depending on the result
+% it executes either its third or fourth argument.
+%
+% \begin{macrocode}
+\def\@ifpresent#1#2#3#4{%
+ \def\tmp##1#1##2\qStop{\ifx!##2!}%
+ \expandafter\tmp#2#1\qStop #4\else #3\fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\tospaces}
+% This macro converts its argument delimited with |\secapsot| to
+% appropriate number of spaces. We need this for smart displaying
+% messages on the screen.
+%
+% |\@spaces| are used when we need many spaces in a row.
+% \begin{macrocode}
+\def\tospaces#1{%
+ \ifx#1\secapsot\secapsot\fi\space\tospaces}
+\def\secapsot\fi\space\tospaces{\fi}
+\def\@spaces{\space\space\space\space\space}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\uptospace}
+% \changes{2.3c}{1995/08/24}{Macro added}
+% This macro extracts from its argument delimited with |\qStop|
+% part up to first occurence of space.
+% \begin{macrocode}
+\def\uptospace#1 #2\qStop{#1}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\afterfi}
+% \changes{2.3c}{1995/09/04}{Macro added}
+% This macro can be used in conditionals to perform some actions
+% (its first parameter) after the condition is completed (i.e.
+% after reading the matching |\fi|. Second parameter is used to
+% gobble the rest of |\if ... \fi| construction (some |\else|
+% maybe). Note that this won't work in nested |\if|s!
+% \begin{macrocode}
+\def\afterfi#1#2\fi{\fi#1}
+% \end{macrocode}
+% \end{macro}
+% \begin{macro}{\@ifnextchar}
+% \changes{2.3e}{1995/09/25}{Macro added}
+% This is one of \LaTeX's macros not defined by plain. My
+% devious definition differs from the standard one but
+% functionality is the same.
+% \begin{macrocode}
+\def\@ifnextchar#1#2#3{\bgroup
+ \def\reserved@a{\ifx\reserved@c #1 \aftergroup\@firstoftwo
+ \else \aftergroup\@secondoftwo\fi\egroup
+ {#2}{#3}}%
+ \futurelet\reserved@c\@ifnch
+ }
+\def\@ifnch{\ifx \reserved@c \@sptoken \expandafter\@xifnch
+ \else \expandafter\reserved@a
+ \fi}
+\def\@firstoftwo#1#2{#1}
+\def\@secondoftwo#1#2{#2}
+\iden{\let\@sptoken= } %
+\iden{\def\@xifnch} {\futurelet\reserved@c\@ifnch}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \subsection{The evaluation of boolean expressions}
+%
+% For clarity we repeat here the syntax for the boolean expressions
+% in a somewhat changed but equivalent way:
+%
+% \DeleteShortVerb\|
+% \begin{tabular}{lcl}
+% \meta{Expression} & $::=$ & \meta{Secondary} $|$
+% \meta{Secondary} \{\texttt{|}, \texttt{,}\}
+% \meta{Expression}\\
+% \meta{Secondary} & $::=$ & \meta{Primary} $|$
+% \meta{Primary} \texttt{\&}
+% \meta{Secondary}\\
+% \meta{Primary} & $::=$ &
+% \meta{Terminal} $|$ \texttt{!}\meta{Primary}
+% $|$
+% \texttt{(}\meta{Expression}\texttt{)}\\
+% \end{tabular}
+%
+% The \texttt{|} stands for disjunction, the \texttt{\&} stands for
+% conjunction and the \texttt{!}\ stands for negation. The
+% \meta{Terminal} is any sequence of letters and evaluates to
+% \meta{true} iff it occurs in the list of options that have to be
+% included.
+% \MakeShortVerb\|
+%
+% Since we can generate multiple output files from one input,
+% same guard expressions can be computed several times with
+% different options. For that reason we first ``compile'' the
+% expression to the form of one parameter macro |\Expr|
+% expanding to nested |\if|s that when given current list of
+% options produces 1 or 0 as a result. The idea is to say
+% |\if1\Expr{|\meta{current set of options}|}...\fi| for all
+% output files.
+%
+% Here is a table recursively defining translations for right
+% sides of the grammar. $\tau(X)$ denotes translation of~$X$.
+%
+% \DeleteShortVerb\|
+% \MakeShortVerb\"
+% \begingroup
+% \addtolength\arraycolsep{-2.1pt}
+% \begin{eqnarray*}
+% \tau(\meta{Terminal})&=&"\t@<Terminal>,#1,<Terminal>,\qStop"\\
+% \tau(!\meta{Primary})&=&"\if1"\,\tau(\meta{Primary})\,"0\else1\fi"\\
+% \tau(\mbox{\texttt{(}\meta{Expression}\texttt{)}})
+% &=&\tau(\meta{Expression})\\
+% \tau(\mbox{\meta{Primary}\texttt{\&}\meta{Secondary}})
+% &=&"\if0"\,\tau(\meta{Primary})\,"0\else"
+% \,\tau(\meta{Secondary})\,"\fi"\\
+% \tau(\mbox{\meta{Secondary}\texttt{|}\meta{Expression}})
+% &=&"\if1"\,\tau(\meta{Secondary})\,"1\else"
+% \,\tau(\meta{Expression})\,"\fi"
+% \end{eqnarray*}
+% \endgroup
+% \DeleteShortVerb\"
+% \MakeShortVerb\|
+% |\t@<Terminal>| denotes macro with name constructed from |t@|
+% with appended tokens of terminal. E.g., for terminal |foo| the
+% translation would be
+%\begin{verbatim}
+% \t@foo,#1,foo,\qStop
+%\end{verbatim}
+% This will end up in definition of |\Expr|, so |#1| here will
+% be substituted by current list of options when |\Expr| is
+% called. Macro |\t@foo| would be defined as
+%\begin{verbatim}
+% \def\t@foo#1,foo,#2\qStop{\ifx>#2>0\else1\fi}
+%\end{verbatim}
+% When called as above this will expand to |1| if |foo| is
+% present on current list of options and to |0| otherwise.
+%
+% Macros below work in ``almost expand-only'' mode i.e.
+% expression is analyzed only by expansion but we have to define
+% some macros on the way (e.g., |\Expr| and |\t@foo|).
+%
+% The first parameter of each of these macros is
+% ``continuation'' (in the sense similar to the language
+% \textsc{Scheme}). Continuation is a function of at least one
+% argument (parameter) being the value of previous steps of
+% computation. For example macro |\Primary| constructs
+% translation of \meta{Primary} expression. When it decides that
+% expression is completed it calls its continuation (its first
+% argument) passing to it whole constructed translation.
+% Continuation may expect more arguments if it wants to see what
+% comes next on the input.
+%
+% We will perform recursive descent parse, but definitions will
+% be presented in bottom-up order.
+%
+% \begin{macro}{\Terminal}
+%
+% \meta{Terminal}s are recognized by macro |\Terminal|. The
+% proper way of calling it is |\Terminal{|\meta{current
+% continuation}|}{}|. Parameters are: continuation,
+% \meta{Terminal} so far and next character from the input.
+% Macro checks if |#3| is one of terminal-ending characters and
+% then takes appropriate actions. Since there are 7 ending
+% chars and probably one |\csname| costs less than 7 nested
+% |\if|s we construct a name and check if it is defined.
+%
+% We must expand |\ifx| completely before taking next actions so
+% we use |\afterfi|.
+% \begin{macrocode}
+\def\Terminal#1#2#3{%
+ \expandafter\ifx\csname eT@#3\endcsname\relax
+% \end{macrocode}
+% If condition is true |#3| belongs to current \meta{Terminal}
+% so we append it to \meta{Terminal}-so-far and call |\Terminal|
+% again.
+% \begin{macrocode}
+ \afterfi{\Terminal{#1}{#2#3}}\else
+% \end{macrocode}
+% When condition is false it's time to end the \meta{Terminal}
+% so we call macro |\TerminalX|. Next character is reinserted to
+% the input.
+%
+% In both cases continuation is passed unchanged.
+% \begin{macrocode}
+ \afterfi{\TerminalX{#1}{#2}#3}\fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\eT@}
+% Here we define macros marking characters that cannot appear
+% inside terminal. The value is not important as long as it is
+% different from |\relax|.
+% \begin{macrocode}
+\Name\let{eT@>}=1
+\Name\let{eT@&}=1 \Name\let{eT@!}=1
+\Name\let{eT@|}=1 \Name\let{eT@,}=1
+\Name\let{eT@(}=1 \Name\let{eT@)}=1
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\TerminalX}
+% This macro should end scanning of \meta{Terminal}. Parameters
+% are continuation and gathered tokens of \meta{Terminal}.
+%
+% Macro starts by issuing an error message if \meta{Terminal} is
+% empty.
+% \begin{macrocode}
+\def\TerminalX#1#2{%
+ \ifx>#2> \errmessage{Error in expression: empty terminal}\fi
+% \end{macrocode}
+% Then a macro is constructed for checking presence of
+% \meta{Terminal} in options list.
+% \begin{macrocode}
+ \Name\def{t@#2}##1,#2,##2\qStop{\ifx>##2>0\else1\fi}%
+% \end{macrocode}
+% And then current continuation is called with translation of
+% \meta{Terminal} according to formula
+% $$\tau(\meta{Terminal})=|\t@<Terminal>,#1,<Terminal>,\qStop|$$
+% \begin{macrocode}
+ #1{\Name\noexpand{t@#2},##1,#2,\noexpand\qStop}%
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Primary}
+% Parameters are continuation and next character from the input.
+%
+% According to the syntax \meta{Primari}es can have three forms.
+% This makes us use even more dirty tricks than usual. Note the
+% |\space| after a series of |\ifx|s. This series produces an
+% one digit number of case to be executed. The number is given
+% to |\ifcase| and |\space| stops \TeX{} scanning for a
+% \meta{number}. Use of |\ifcase| gives possibility to have one
+% of three actions selected without placing them in nested
+% |\if|s and so to use |\afterfi|.
+% \begin{macrocode}
+\def\Primary#1#2{%
+ \ifcase \ifx!#20\else\ifx(#21\else2\fi\fi\space
+% \end{macrocode}
+% First case is for |!| i.e. negated \meta{Primary}. In this
+% case we call |\Primary| recursively but we create new
+% continuation: macro |\NPrimary| that will negate result
+% passed by |\Primary| and pass it to current continuation
+% (|#1|).
+% \begin{macrocode}
+ \afterfi{\Primary{\NPrimary{#1}}}\or
+% \end{macrocode}
+% When next character is |(| we call |\Expression| giving it as
+% continuation macro |\PExpression| which will just pass the
+% result up but ensuring first that a |)| comes next.
+% \begin{macrocode}
+ \afterfi{\Expression{\PExpression{#1}}}\or
+% \end{macrocode}
+% Otherwise we start a \meta{Terminal}. |#2| is not passed as
+% \meta{Terminal}-so-far but reinserted to input since we didn't
+% check if it can appear in a \meta{Terminal}.
+% \begin{macrocode}
+ \afterfi{\Terminal{#1}{}#2}\fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\NPrimary}
+% Parameters are continuation and previously computed
+% \meta{Primary}.
+%
+% This macro negates result of previous computations according
+% to the rule
+% $$\tau(!\meta{Primary})
+% =|\if1|\,\tau(\meta{Primary})\,|0\else1\fi|$$
+% \begin{macrocode}
+\def\NPrimary#1#2{%
+ #1{\noexpand\if1#20\noexpand\else1\noexpand\fi}%
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\PExpression}
+% Parameters: continuation, \meta{Expression}, next character
+% from input. We are checking if character is |)| and then pass
+% unchanged result to our continuation.
+% \begin{macrocode}
+\def\PExpression#1#2#3{%
+ \ifx)#3\else
+ \errmessage{Error in expression: expected right parenthesis}\fi
+ #1{#2}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Secondary}
+% Each \meta{Secondary} expression starts with \meta{Primary}.
+% Next checks will be performed by |\SecondaryX|.
+% \begin{macrocode}
+\def\Secondary#1{%
+ \Primary{\SecondaryX{#1}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\SecondaryX}
+% Parameters: continuation, translation of \meta{Primary}, next
+% character. We start by checking if next character is |&|.
+% \begin{macrocode}
+\bgroup\catcode`\&=12
+\gdef\SecondaryX#1#2#3{%
+ \ifx&#3%
+% \end{macrocode}
+% If it is we should parse next \meta{Secondary} and then
+% combine it with results so far. Note that |\SecondaryXX| will
+% have 3 parameters.
+% \begin{macrocode}
+ \afterfi{\Secondary{\SecondaryXX{#1}{#2}}}\else
+% \end{macrocode}
+% Otherwise \meta{Secondary} turned out to be just
+% \meta{Primary}. We call continuation passing to it translation
+% of that \meta{Primary} not forgetting to reinsert |#3| to the
+% input as it does not belong here.
+% \begin{macrocode}
+ \afterfi{#1{#2}#3}\fi
+ }
+\egroup
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\SecondaryXX}
+% Parameters: continuation, translation of \meta{Primary},
+% translation of \meta{Secondary}. We construct translation of
+% whole construction according to the rule:
+% $$\tau(\mbox{\meta{Primary}\texttt{\&}\meta{Secondary}})
+% =|\if0|\,\tau(\meta{Primary})\,|0\else|
+% \,\tau(\meta{Secondary})\,|\fi| $$
+% and pass it to our continuation.
+% \begin{macrocode}
+\def\SecondaryXX#1#2#3{%
+ #1{\noexpand\if0#20\noexpand\else#3\noexpand\fi}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Expression}
+% Every \meta{Expression} starts with \meta{Secondary}. We
+% construct new continuation and pass it to |\Secondary|.
+% \begin{macrocode}
+\def\Expression#1{%
+ \Secondary{\ExpressionX{#1}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ExpressionX}
+% Parameters: continuation, translation of \meta{Secondary},
+% next character. We perform check if character is
+% \texttt{\char`\|} or |,|.
+% \begin{macrocode}
+\def\ExpressionX#1#2#3{%
+ \if0\ifx|#31\else\ifx,#31\fi\fi0
+% \end{macrocode}
+% If it is not \meta{Expression} is just a \meta{Secondary}. We
+% pass its translation to continuation and reinsert |#3|.
+% \begin{macrocode}
+ \afterfi{#1{#2}#3}\else
+% \end{macrocode}
+% If we are dealing with complex \meta{Expression} we should
+% parse another |\Expression| now.
+% \begin{macrocode}
+ \afterfi{\Expression{\ExpressionXX{#1}{#2}}}\fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ExpressionXX}
+% Parameters: continuation, translation of \meta{Secondary},
+% translation of \meta{Expression}.
+% We finish up translating of \meta{Expression} according to
+% the formula:
+% $$\tau(\mbox{\meta{Secondary}\texttt{\char`\|}\meta{Expression}})
+% =|\if1|\,\tau(\meta{Secondary})\,|1\else|
+% \,\tau(\meta{Expression})\,|\fi|$$
+% \begin{macrocode}
+\def\ExpressionXX#1#2#3{%
+ #1{\noexpand\if1#21\noexpand\else#3\noexpand\fi}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\StopParse}
+% Here is initial continuation for whole parse process. It will
+% be used by |\Evaluate|. Note that we assume that expression
+% has |>| on its end. This macro eventually defines |\Expr|.
+% Parameters: translation of whole \meta{Expression} and next
+% character from input.
+% \begin{macrocode}
+\def\StopParse#1#2{%
+ \ifx>#2 \else\errmessage{Error in expression: spurious #2}\fi
+ \edef\Expr##1{#1}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\Evaluate}
+% This macro is used to start parsing. We call |\Expression|
+% with continuation defined above. On end of expression we
+% append a |>|.
+% \begin{macrocode}
+\def\Evaluate#1{%
+ \Expression\StopParse#1>}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Processing the input lines}
+%
+% \begin{macro}{\normalLine}
+% The macro |\normalLine| writes its argument (which has to be
+% delimited with |\endLine|) on all active output files i.e.
+% those with off-counters equal to zero.
+% If statistics are included, the counter
+% |\codeLinesPassed| is incremented by $1$.
+% \begin{macrocode}
+\def\normalLine#1\endLine{%
+%<*stats>
+ \advance\codeLinesPassed\@ne
+%</stats>
+ \maybeMsg{.}%
+ \def\inLine{#1}%
+ \let\do\putline@do
+ \activefiles
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\putline@do}
+% \changes{2.3b}{1995/08/22}{Change for pre-constructed
+% off-counters' names}
+% This is a value for |\do| when copying line to output files.
+% \begin{macrocode}
+\def\putline@do#1#2#3{%
+ \StreamPut#1{\inLine}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\removeComment}
+% The macro |\removeComment| throws its argument (which has to be
+% delimited with |\endLine|) away. When statistics are included
+% in the program the removed comment is counted.
+% \begin{macrocode}
+%
+\def\removeComment#1\endLine{%
+%<*stats>
+ \advance\commentsRemoved\@ne
+%</stats>
+ \maybeMsg{\perCent}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\putMetaComment}
+% \changes{2.3e}{1996/09/16}{Introduced \cs{MetaPrefix}}
+% If a line starts with two consecutive percent signs, it is
+% considered to be a {\em MetaComment\/}. Such a comment line is
+% passed on to the output file unmodified.
+% \begin{macrocode}
+\bgroup\catcode`\%=12
+\iden{\egroup
+\def\putMetaComment%}#1\endLine{%
+% \end{macrocode}
+% If statistics are included the line is counted.
+% \begin{macrocode}
+%<*stats>
+ \advance\commentsPassed\@ne
+%</stats>
+% \end{macrocode}
+% The macro |\putMetaComment| has one argument, delimited with
+% |\endLine|. It brings the source line with |%%| stripped. We
+% prepend to it |\MetaPrefix| (which can be different from |%%|)
+% and send the line to all active files.
+% \begin{macrocode}
+ \edef\inLine{\MetaPrefix#1}%
+ \let\do\putline@do
+ \activefiles
+ }
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\processLine}
+% \changes{2.3a}{1995/08/18}{Adaptation for concurrent version}
+% \changes{2.3a}{1995/08/20}{Trying to avoid assignments}
+% Each line that is read from the input stream has to be processed
+% to see if it has to be written on the output stream. This task
+% is performed by calling the macro |\processLine|.
+% In order to do
+% that, it needs to check whether the line starts with a
+% `\texttt{\%}'. Therefore the macro is globally defined within a
+% group. Within this group the category code of `\texttt{\%}' is
+% changed to 12 (other). Because a comment character is needed,
+% the category code of `\texttt{*}' is changed to 14 (comment
+% character).
+%
+% The macro increments counter |\processedLines| by $1$ if
+% statistics are included. We cannot include this line with
+% |%<*stats>| since the category of \texttt{\%} is changed and the
+% file must be loadable unstripped. So the whole definition is
+% repeated embedded in guards.
+%
+% The next token from the input stream is passed in |#1|. If it is
+% a `\texttt{\%}' further processing has to be done by
+% |\processLineX|; otherwise this is normal (not commented out)
+% line.
+%
+% In either case the character read is reinserted to the input
+% as it may have to be written out.
+%
+% \begin{macrocode}
+%<*!stats>
+\begingroup
+\catcode`\%=12 \catcode`\*=14
+\gdef\processLine#1{*
+ \ifx%#1
+ \expandafter\processLineX
+ \else
+ \expandafter\normalLine
+ \fi
+ #1}
+\endgroup
+%</!stats>
+%<*stats>
+\begingroup
+\catcode`\%=12 \catcode`\*=14
+\gdef\processLine#1{*
+ \advance\processedLines\@ne
+ \ifx%#1
+ \expandafter\processLineX
+ \else
+ \expandafter\normalLine
+ \fi
+ #1}
+\endgroup
+%</stats>
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\processLineX}
+% \changes{2.3a}{1995/08/20}{Trying to avoid assignments}
+% This macro is also defined within a group,
+% because it also has to check if the next
+% token in the input stream is a `\texttt{\%}' character.
+%
+% If the second token in the current line happens to be a
+% `\texttt{\%}', a \meta{MetaComment} has been found. This has to
+% be copied in its entirety to the output. Another possible second
+% character is `\texttt{<}', which introduces a guard expression.
+% The processing of such an expression is started by calling
+% |\checkOption|.
+%
+% When the token was neither a `\texttt{\%}' nor a `\texttt{<}',
+% the line contains a normal comment that has to be removed.
+%
+% We express conditions in such a way that all actions appear
+% on first nesting level of |\if|s. In such conditions just one
+% expandafter pushes us outside whole construction. A thing to
+% watch here is |\relax|. It stops search for numeric constant.
+% If it wasn't here \TeX\ would expand the first case of |\ifcase|
+% before knowing the value.
+%
+% \begin{macrocode}
+\begingroup
+\catcode`\%=12 \catcode`\*=14
+\gdef\processLineX%#1{*
+ \ifcase\ifx%#10\else
+ \ifx<#11\else 2\fi\fi\relax
+ \expandafter\putMetaComment\or
+ \expandafter\checkOption\or
+ \expandafter\removeComment\fi
+ #1}
+\endgroup
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{The handling of options}
+%
+% \begin{macro}{\checkOption}
+% \changes{2.3a}{1995/08/18}{Adapted to concurrent version}
+% \changes{2.3a}{1995/08/20}{Trying to avoid assignments}
+% \changes{2.3e}{1996/09/16}{Verbatim mode}
+% When the macros that process a line have found that the line
+% starts with `\texttt{\%<}', a guard line has been encountered.
+% The first character of a guard can be an asterisk (\texttt{*}), a
+% slash (\texttt{/}) a plus (\texttt{+}), a minus (\texttt{-}), a
+% less-than sign (\texttt{<}) starting verbatim mode or
+% any other character that can be found in an option name. This
+% means that we have to peek at the next token and
+% decide what kind of guard we have.
+%
+% We reinsert |#1| as it may be needed by |\doOption|.
+% \begin{macrocode}
+\def\checkOption<#1{%
+ \ifcase
+ \ifx*#10\else \ifx/#11\else
+ \ifx+#12\else \ifx-#13\else
+ \ifx<#14\else 5\fi\fi\fi\fi\fi\relax
+ \expandafter\starOption\or
+ \expandafter\slashOption\or
+ \expandafter\plusOption\or
+ \expandafter\minusOption\or
+ \expandafter\verbOption\or
+ \expandafter\doOption\fi
+ #1}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\doOption}
+% When no guard modifier is found by |\checkOptions|, the
+% macro |\doOption| is called. It evaluates a boolean
+% expression. The result of this evaluation is stored in
+% |\Expr|. The guard only affects the current
+% line, so |\do| is defined in such a way that depending on the
+% result of the test |\if1\Expr{|\meta{options}|}|, the current
+% line is either copied to the output stream or removed. Then
+% the test is computed for all active output files.
+% \begin{macrocode}
+\def\doOption#1>#2\endLine{%
+ \maybeMsg{<#1 . >}%
+ \Evaluate{#1}%
+ \def\do##1##2##3{%
+ \if1\Expr{##2}\StreamPut##1{#2}\fi
+ }%
+ \activefiles
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\plusOption}
+% When a `\texttt{+}' is found as a guard modifier,
+% |\plusOption| is called. This macro is very similar to
+% |\doOption|, the only difference being that displayed
+% message now contains `\texttt{+}'.
+% \begin{macrocode}
+\def\plusOption+#1>#2\endLine{%
+ \maybeMsg{<+#1 . >}%
+ \Evaluate{#1}%
+ \def\do##1##2##3{%
+ \if1\Expr{##2}\StreamPut##1{#2}\fi
+ }%
+ \activefiles
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\minusOption}
+% When a `\texttt{-}' is found as a guard modifier,
+% |\minusOption| is called. This macro is very similar to
+% |\plusOption|, the difference is that condition is negated.
+% \begin{macrocode}
+\def\minusOption-#1>#2\endLine{%
+ \maybeMsg{<-#1 . >}%
+ \Evaluate{#1}%
+ \def\do##1##2##3{%
+ \if1\Expr{##2}\else \StreamPut##1{#2}\fi
+ }%
+ \activefiles
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\starOption}
+% \changes{2.3a}{1995/08/18}{Adapted to concurrent version}
+% When a `\texttt{*}' is found as a guard modifier,
+% |\starOption| is called. In this case a block of code will
+% be included in the output on the condition that the guard
+% expression evaluates to \meta{true}.
+%
+% The current line is gobbled as |#2|, because it only contains
+% the guard and possibly a comment.
+%
+% \begin{macrocode}
+\def\starOption*#1>#2\endLine{%
+% \end{macrocode}
+% First we optionally write
+% a message to the terminal to indicate that a new option starts
+% here.
+% \begin{macrocode}
+ \maybeMsg{<*#1}%
+% \end{macrocode}
+% Then we push the current contents of |\blockHead| on the
+% stack of blocks, |\guardStack| and increment the counter
+% |\blockLevel| to indicate that we are now one level of
+% nesting deeper.
+% \changes{2.0k}{1992/04/06}{Use new stack mechanism}
+% \changes{2.0k}{1992/04/09}{The macro that holds the guard needs to be
+% expanded}
+% \begin{macrocode}
+ \expandafter\push\expandafter\guardStack\expandafter{\blockHead}%
+ \advance\blockLevel\@ne
+% \end{macrocode}
+% The guard for this block of code is now stored in
+% |\blockHead|.
+% \begin{macrocode}
+ \def\blockHead{#1}%
+% \end{macrocode}
+% Now we evaluate guard expression for all output files
+% updating off-counters. Then we create new list of active
+% output files. Only files that were active in the outer block
+% can remain active now.
+% \begin{macrocode}
+ \Evaluate{#1}%
+ \let\do\checkguard@do
+ \outputfiles
+ \let\do\findactive@do
+ \edef\activefiles{\activefiles}
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\checkguard@do}
+% \changes{2.3b}{1995/08/22}{Change for pre-constructed
+% off-counters' names}
+% This form of |\do| updates off-counts according to the value of
+% guard expression.
+% \begin{macrocode}
+\def\checkguard@do#1#2#3{%
+% \end{macrocode}
+% If this block of code occurs inside another block of code that is
+% {\em not\/} included in the output, we increment the off counter.
+% In that case the guard expression will not be
+% evaluated, because a block inside another block that is excluded
+% from the output will also be excluded, regardless of the
+% evaluation of its guard.
+% \begin{macrocode}
+ \ifnum#3>0
+ \advance#3\@ne
+% \end{macrocode}
+% When the off count has value 0, we have
+% to evaluate the guard expression. If the result is \meta{false}
+% we increase the off-counter.
+% \begin{macrocode}
+ \else
+ \if1\Expr{#2}\else
+ \advance#3\@ne\fi
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\findactive@do}
+% \changes{2.3b}{1995/08/22}{Change for pre-constructed
+% off-counters' names}
+% This form of |\do| picks elements of output files list which
+% have off-counters equal to zero.
+% \begin{macrocode}
+\def\findactive@do#1#2#3{%
+ \ifnum#3=0
+ \noexpand\do#1{#2}#3\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\slashOption}
+% \changes{2.3a}{1995/08/18}{Adapted for concurrent version}
+% The macro |\slashOption| is the counterpart to
+% |\starOption|. It indicates the end of a block of
+% conditionally included code. We store the argument in the
+% temporary control sequence |\tmp|.
+% \begin{macrocode}
+\def\slashOption/#1>#2\endLine{%
+ \def\tmp{#1}%
+% \end{macrocode}
+% When the counter |\blockLevel| has a value less than $1$,
+% this `end-of-block' line has no corresponding `start-of-block'.
+% Therefore we signal an error and ignore this end of block.
+% \begin{macrocode}
+ \ifnum\blockLevel<\@ne
+ \errmessage{Spurious end block </\tmp> ignored}%
+% \end{macrocode}
+% Next we compare the contents of |\tmp| with the contents
+% of |\blockHead|. The latter macro contains the last guard for
+% a block of code that was encountered. If the contents match, we
+% pop the previous guard from the stack.
+% \changes{2.0k}{1992/04/06}{Use new stack mechanism}
+% \begin{macrocode}
+ \else
+ \ifx\tmp\blockHead
+ \pop\guardStack\blockHead
+% \end{macrocode}
+% When the contents of the two macros don't match something is
+% amiss. We signal this to the user, but accept the `end-of-block'.
+%\note{Is this the desired behaviour??}
+% \begin{macrocode}
+ \else
+ \errmessage{Found </\tmp> instead of </\blockHead>}%
+ \fi
+% \end{macrocode}
+% When the end of a block of optionally included code is encountered
+% we optionally signal this on the terminal and decrement the counter
+% |\blockLevel|.
+% \begin{macrocode}
+ \maybeMsg{>}%
+ \advance\blockLevel\m@ne
+% \end{macrocode}
+% The last thing that has to be done is to decrement off-counters and
+% make new list of active files. Now whole list of output files has
+% to be searched since some inactive files could have been
+% reactivated.
+% \begin{macrocode}
+ \let\do\closeguard@do
+ \outputfiles
+ \let\do\findactive@do
+ \edef\activefiles{\outputfiles}
+ \fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\closeguard@do}
+% \changes{2.3b}{1995/08/22}{Change for pre-constructed
+% off-counters' names}
+% This macro decrements non-zero off-counters.
+% \begin{macrocode}
+\def\closeguard@do#1#2#3{%
+ \ifnum#3>0
+ \advance#3\m@ne
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\verbOption}
+% \changes{2.3e}{1996/09/16}{Macro added}
+% \changes{2.4g}{1996/12/13}{Reset \cs{putline@do} for /2340}
+% This macro is called when a line starts with |%<<|. It reads a
+% bunch of lines in verbatim mode: the lines are passed unchanged
+% to the output without even checking for starting |%|. This way of
+% processing ends when a line containing only a percent sign
+% followed by stop mark given on the |%<<| line is found.
+% \begin{macrocode}
+\def\verbOption<#1\endLine{{%
+ \edef\verbStop{\perCent#1}\maybeMsg{<<<}%
+ \let\do\putline@do
+ \loop
+ \ifeof\inFile\errmessage{Source file ended while in verbatim
+ mode!}\fi
+ \read\inFile to \inLine
+ \if 1\ifx\inLine\verbStop 0\fi 1% if not inLine==verbStop
+ \activefiles
+ \maybeMsg{.}%
+ \repeat
+ \maybeMsg{>}%
+ }}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Batchfile commands}
+% \changes{2.3e}{1996/10/02}{Added doc}
+% \ds{} keeps information needed to control inclusion of sources in
+% several list structures. Lists are macros expanding to a series
+% of calls to macro |\do| with two or three parameters.
+% Subsequently |\do| is redefined in various ways and list
+% macros sometimes are executed to perform some action on every
+% element, and sometimes are used inside an |\edef| to make new
+% list of elements having some properties. For every input file
+% \meta{infile} the following lists are kept:
+% \begin{itemize}
+% \item[\cs{b@}\meta{infile}] the ``open list''---names of all output
+% files such that their generation should start with
+% reading of \meta{infile},
+% \item[\cs{o@}\meta{infile}] the ``output list''---names of all
+% output files generated from that source together with
+% suitable sets of options (guards),
+% \item[\cs{e@}\meta{infile}] the ``close list''---names of all
+% output files that should be closed when this source is
+% read.
+% \end{itemize}
+%
+% For every output file name \meta{outfile} \ds{} keeps following
+% information:
+% \begin{itemize}
+% \item[\cs{pth@}\meta{outfile}] full pathname (including file name),
+% \item[\cs{ref@}\meta{outfile}] reference lines for the file,
+% \item[\cs{in@}\meta{outfile}] names of all source files separated
+% with spaces (needed by \cs{InFileName}),
+% \item[\cs{pre@}\meta{outfile}] preamble template (as defined with
+% |\declarepreamble|),
+% \item[\cs{post@}\meta{outfile}] postamble template.
+% \end{itemize}
+%
+% \begin{macro}{\generate}
+% \changes{2.3a}{1995/08/20}{Messages changed}
+% \changes{2.4a}{1996/06/06}{Repeat processing of files until all
+% done (MDW)}
+% This macro executes its argument in a group. |\inputfiles| is
+% a list of files to be read, |\filestogenerate| list of names
+% of output files (needed for the message below). |\file|s
+% contained in |#1| define |\inputfiles| in such a way that all
+% that has to be done when the parameter is executed is to call
+% this macro. |\inputfiles| command is called over and over again
+% until no output files had to be postponed.
+% \begin{macrocode}
+\def\generate#1{\begingroup
+ \let\inputfiles\empty \let\filestogenerate\empty
+ \let\file\@file
+ #1
+ \ifx\filestogenerate\empty\else
+ \Msg{^^JGenerating file(s) \filestogenerate}\fi
+ \def\inFileName{\csname in@\outFileName\endcsname}%
+ \def\ReferenceLines{\csname ref@\outFileName\endcsname}%
+ \processinputfiles
+ \endgroup}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\processinputfiles}
+% \changes{2.4a}{1996/10/02}{Macro added (MW)}
+% This is a recurrent function which processes input files until
+% they are all gone.
+% \begin{macrocode}
+\def\processinputfiles{%
+ \let\newinputfiles\empty
+ \inputfiles
+ \let\inputfiles\newinputfiles
+ \ifx\inputfiles\empty\else
+ \expandafter\processinputfiles
+ \fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\file}
+% The first argument is the file to produce, the second
+% argument contains the list of input files. Each entry should have
+% the format
+% \verb=\from{=\meta{filename.ext}\verb=}{=\meta{options}\verb=}=.
+%
+% \changes{2.3a}{1995/08/20}{Messages changed}
+% ^^A The macro starts by displaying a message on the terminal to
+% ^^A indicate which file is going to be made.
+% The switch |\ifGenerate| is initially set to \meta{true}.
+% \begin{macrocode}
+\def\file#1#2{\errmessage{Command `\string\file' only allowed in
+ argument to `\string\generate'}}
+\def\@file#1{%
+ \Generatetrue
+% \end{macrocode}
+% Next we construct full path name for output file and check if we
+% have to be careful about overwriting existing files. If the user
+% specified |\askforoverwritetrue| we will ask him if he wants to
+% overwrite an existing file. Otherwise we simply go ahead.
+% \begin{macrocode}
+ \makepathname{#1}%
+ \ifaskforoverwrite
+% \end{macrocode}
+% We try to open a file with the name of the output file for
+% reading. If this succeeds the file exists and we ask the user if
+% he wants to overwrite the file.
+% \changes{2.0p}{1992/06/26}{Added \cs{WriteToDir} (FMi).}
+% \changes{2.3a}{1995/08/18}{Changed \cs{@empty} (which was undefined)
+% to \cs{empty}}
+% \changes{2.3e}{1995/09/25}{Changed \cs{WriteToDir} to \cs{destdir}}
+% \begin{macrocode}
+ \immediate\openin\inFile\@pathname\relax
+ \ifeof\inFile\else
+ \Ask\answer{File \@pathname\space already exists
+ \ifx\empty\destdir somewhere \fi
+ on the system.^^J%
+ Overwrite it%
+ \ifx\empty\destdir\space if necessary\fi
+ ? [y/n]}%
+% \end{macrocode}
+% We set the switch |\ifGenerate| according to his answer. We
+% allow for both ``\texttt{y}'' and ``\texttt{yes}''.
+% \begin{macrocode}
+ \ifx\y \answer \else
+ \ifx\yes\answer \else
+ \Generatefalse\fi\fi\fi
+% \end{macrocode}
+% Don't forget to close the file just opened as we want to write
+% to it.
+% \begin{macrocode}
+ \closein\inFile
+ \fi
+% \end{macrocode}
+% \changes{2.3e}{1995/09/25}{Destination directory handling}
+% If file is to be generated we save its destination pathname and
+% pass control to macro |\@fileX|.
+% Note that file name is turned into control sequence and |\else|
+% branch is skipped before calling |\@fileX|.
+% \begin{macrocode}
+ \ifGenerate
+ \Name\let{pth@#1}\@pathname
+ \@addto\filestogenerate{\@pathname\space}%
+ \Name\@fileX{#1\expandafter}%
+ \else
+% \end{macrocode}
+% In case we were not allowed to overwrite an existing file
+% we inform the user that we are {\em not\/} generating his file
+% and we gobble |\from| specifications.
+% \begin{macrocode}
+ \Msg{Not generating file \@pathname^^J}%
+ \expandafter\@gobble
+ \fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@fileX}
+% We put name of current output file in |\curout| and initialize
+% |\curinfiles| (the list of source files for this output file)
+% to empty---these will be needed by |\from|. Then we start
+% defining preamble for the current file.
+% \begin{macrocode}
+\def\@fileX#1#2{%
+ \chardef#1=\stream@closed
+ \def\curout{#1}%
+ \let\curinfiles\empty
+ \let\curinnames\empty
+ \def\curref{\MetaPrefix ^^J%
+ \MetaPrefix\space The original source files were:^^J%
+ \MetaPrefix ^^J}%
+% \end{macrocode}
+% Next we execute second parameter. |\from|s will add reference
+% lines to the preamble.
+% \begin{macrocode}
+ \let\from\@from \let\needed\@needed
+ #2%
+ \let\from\err@from \let\needed\err@needed
+% \end{macrocode}
+% We check order of input files.
+% \begin{macrocode}
+ \checkorder
+% \end{macrocode}
+% Each |\from| clause defines |\curin| to be its first parameter.
+% So now |\curin| holds name of last input file for current output
+% file. This means that current output file should be closed after
+% processing |\curin|. We add |#1| to proper `close list'.
+% \begin{macrocode}
+ \Name\@addto{e@\curin}{\noexpand\closeoutput{#1}}%
+% \end{macrocode}
+% Last we save all the interesting information about current file.
+% \begin{macrocode}
+ \Name\let{pre@\@stripstring#1\expandafter}\currentpreamble
+ \Name\let{post@\@stripstring#1\expandafter}\currentpostamble
+ \Name\edef{in@\@stripstring#1}{\expandafter\iden\curinnames}
+ \Name\edef{ref@\@stripstring#1}{\curref}
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\checkorder}
+% This macro checks if the order of files in |\curinfiles|
+% agrees with that of |\inputfiles|. The coding is somewhat
+% clumsy.
+% \begin{macrocode}
+\def\checkorder{%
+ \expandafter\expandafter\expandafter
+ \checkorderX\expandafter\curinfiles
+ \expandafter\qStop\inputfiles\qStop
+ }
+\def\checkorderX(#1)#2\qStop#3\qStop{%
+ \def\tmp##1\readsource(#1)##2\qStop{%
+ \ifx!##2! \order@error
+ \else\ifx!#2!\else
+ \checkorderXX##2%
+ \fi\fi}%
+ \def\checkorderXX##1\readsource(#1)\fi\fi{\fi\fi
+ \checkorderX#2\qStop##1\qStop}%
+ \tmp#3\readsource(#1)\qStop
+ }
+\def\order@error#1\fi\fi{\fi
+ \errmessage{DOCSTRIP error: Incompatible order of input
+ files specified for file
+ `\iden{\expandafter\uptospace\curin} \qStop'.^^J
+ Read DOCSTRIP documentation for explanation.^^J
+ This is a serious problem, I'm exiting}\end
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\needed}
+% \changes{2.3c}{1995/08/24}{Macro added}
+% \changes{2.3e}{1996/09/12}{Forced expansion of argument to fix a bug
+% with filenames containing macros}
+% \begin{macro}{\@needed}
+% This macro uniquizes name of an input file passed as a
+% parameter and marks it as needed to be input. It is used
+% internally by |\from|, but can also be issued in argument to
+% |\file| to influence the order in which files are read.
+% \begin{macrocode}
+\def\needed#1{\errmessage{\string\needed\space can only be used in
+ argument to \string\file}}
+\let\err@needed\needed
+\def\@needed#1{%
+ \edef\reserved@a{#1}%
+ \expandafter\@need@d\expandafter{\reserved@a}}
+\def\@need@d#1{%
+ \@ifpresent{(#1)}\curinfiles
+% \end{macrocode}
+% If |#1| is present on list of input files for current output
+% file we add a space on end of its name and try again. The idea
+% is to construct a name that will look different for \TeX\ but
+% will lead to the same file when seen by operating system.
+% \begin{macrocode}
+ {\@need@d{#1 }}%
+% \end{macrocode}
+% When it is not we check if |#1| is present in the list of
+% files to be processed. If not we add it and initialize list of
+% output files for that input and list of output files that
+% should be closed when this file closes. We also add
+% constructed name to |\curinfiles| and define |\curin| to be
+% able to access constructed name from |\@from|.
+% \begin{macrocode}
+ {\@ifpresent{\readsource(#1)}\inputfiles
+ {}{\@addto\inputfiles{\noexpand\readsource(#1)}%
+ \Name\let{b@#1}\empty
+ \Name\let{o@#1}\empty
+ \Name\let{e@#1}\empty}%
+ \@addto\curinfiles{(#1)}%
+ \def\curin{#1}}%
+ }
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\from}
+% \changes{2.3c}{1995/08/24}{part of code moved to \cs{needed}}
+% |\from| starts by adding a line to preamble for output file.
+% \begin{macrocode}
+\def\from#1#2{\errmessage{Command `\string\from' only allowed in
+ argument to `\string\file'}}
+\let\err@from\from
+\def\@from#1#2{%
+ \@addto\curref{\MetaPrefix\space #1 \if>#2>\else
+ \space (with options: `#2')\fi^^J}%
+% \end{macrocode}
+% Then we mark the file as needed input file.
+% \begin{macrocode}
+ \needed{#1}%
+% \end{macrocode}
+% \changes{2.3e}{1996/10/02}{Introduced ``open list''}
+% If this is the first |\from| in current |\file| (i.e. if the
+% |\curinnames| so far is empty) the file name is added to the
+% ``open list'' for the current input file.
+% And |\do|\meta{current output}|{|\meta{options}|}| is appended
+% to the list of output files for current input file.
+% \begin{macrocode}
+ \ifx\curinnames\empty
+ \Name\@addto{b@\curin}{\noexpand\openoutput\curout}%
+ \fi
+ \@addto\curinnames{ #1}%
+ \Name\@addto{o@\curin}{\noexpand\do\curout{#2}}%
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\readsource}
+% \changes{2.4a}{1996/06/06}{Extensively hacked to honour stream
+% limits (MDW)}
+% \changes{2.3a}{1995/08/18}{Renamed to \cs{readsource}; adaptation for
+% concurrent version}
+% \changes{2.0f}{1991/06/04}{Added check for lines with \texttt{\bsl
+% endinput}} This macro is called for each input file that
+% is to be processed.
+%
+% \begin{macrocode}
+\def\readsource(#1){%
+% \end{macrocode}
+% We try to open the input file. If this doesn't succeed, we
+% tell the user so and nothing else happens.
+% \begin{macrocode}
+ \immediate\openin\inFile\uptospace#1 \qStop\relax
+ \ifeof\inFile
+ \errmessage{Cannot find file \uptospace#1 \qStop}%
+ \else
+% \end{macrocode}
+% If statistics are included we nullify line counters
+% \begin{macrocode}
+%<*stats>
+ \processedLines\z@
+ \commentsRemoved\z@
+ \commentsPassed\z@
+ \codeLinesPassed\z@
+%</stats>
+% \end{macrocode}
+% \changes{2.3b}{1995/08/22}{Change for pre-constructed
+% off-counters' names}
+% \changes{2.3e}{1996/10/02}{Introduced ``open list''}
+% When the input file was successfully opened, we try to open all
+% needed output files by executing the ``open list''.
+% If any of files couldn't be opened because of number of streams
+% limits, their names are put into |\refusedfiles| list. This list
+% subsequently becomes the open list for the next pass.
+% \begin{macrocode}
+ \let\refusedfiles\empty
+ \csname b@#1\endcsname
+ \Name\let{b@#1}\refusedfiles
+% \end{macrocode}
+% Now all output files that could be opened are open. So we go
+% through the ``output list'' and for every open file we display a
+% message and zero the off-counter, while closed files are appended
+% to |\refusedfiles|.
+% \begin{macrocode}
+ \Msg{} \def\@msg{Processing file \uptospace#1 \qStop}
+ \def\change@msg{%
+ \edef\@msg{\@spaces\@spaces\@spaces\space
+ \expandafter\tospaces\uptospace#1 \qStop\secapsot}
+ \let\change@msg\relax}
+ \let\do\showfiles@do
+ \let\refusedfiles\empty
+ \csname o@#1\endcsname
+% \end{macrocode}
+% If |\refusedfiles| is nonempty current source file needs reread,
+% so we append it to |\newinputfiles|.
+% \begin{macrocode}
+ \ifx\refusedfiles\empty\else
+ \@addto\newinputfiles{\noexpand\readsource(#1)}
+ \fi
+% \end{macrocode}
+% Finally we define |\outputfiles| and construct off-counters
+% names. Now |\do|s will have 3 parameters! All output files become
+% active.
+% \begin{macrocode}
+ \let\do\makeoutlist@do
+ \edef\outputfiles{\csname o@#1\endcsname}%
+ \let\activefiles\outputfiles
+ \Name\let{o@#1}\refusedfiles
+% \end{macrocode}
+% Now we change the category code of a lot of characters to
+% \meta{other} and make sure that no extra spaces appear in the
+% lines read by setting the |\endlinechar| to $-1$.
+% \begin{macrocode}
+ \makeOther\ \makeOther\\\makeOther\$%
+ \makeOther\#\makeOther\^\makeOther\^^K%
+ \makeOther\_\makeOther\^^A\makeOther\%%
+ \makeOther\~\makeOther\{\makeOther\}\makeOther\&%
+ \endlinechar-1\relax
+% \end{macrocode}
+% Then we start a loop to process the lines in the file one by one.
+% \begin{macrocode}
+ \loop
+ \read\inFile to\inLine
+% \end{macrocode}
+% The first thing we check is whether the current line
+% contains an |\endinput|. To allow also real |\endinput|
+% commands in the source file, |\endinput| is only recognized
+% when it occurs directly at the beginning of a line.
+% \begin{macrocode}
+ \ifx\inLine\Endinput
+% \end{macrocode}
+% In this case we output a message to inform the programmer (in
+% case this was a mistake) and end the loop immediately by setting
+% \verb=Continue= to \meta{false}. Note that |\endinput| is
+% not placed into the output file. This is important in cases where
+% the output file is generated from several \texttt{doc} files.
+% \begin{macrocode}
+ \Msg{File #1 ended by \string\endinput.}%
+ \Continuefalse
+ \else
+% \end{macrocode}
+% \changes{2.0j}{1992/03/03}{First check for end of file before check
+% for empty lines} When the end of the file is found we have to
+% interrupt the loop.
+% \begin{macrocode}
+ \ifeof\inFile
+ \Continuefalse
+% \end{macrocode}
+% \changes{2.0i}{1991/06/27}{Added check for consecutive empty lines}
+% If the file did not end we check if the input line is empty.
+% If it is, the counter |\emptyLines| is incremented.
+% \begin{macrocode}
+ \else
+ \Continuetrue
+ \ifx\inLine\empty
+ \advance\emptyLines\@ne
+ \else
+ \emptyLines\z@
+ \fi
+% \end{macrocode}
+% When the number of empty lines seen so far exceeds 1, we skip them.
+% If it doesn't, the expansion of |\inLine| is fed to |\processLine|
+% with |\endLine| appended to indicate the end of the line.
+% \begin{macrocode}
+ \ifnum \emptyLines<2
+ \expandafter\processLine\inLine\endLine
+ \else
+ \maybeMsg{/}%
+ \fi
+ \fi
+ \fi
+% \end{macrocode}
+% When the processing of the line is finished, we check if there is
+% more to do, in which case we repeat the loop.
+% \begin{macrocode}
+ \ifContinue
+ \repeat
+% \end{macrocode}
+% The input file is closed.
+% \begin{macrocode}
+ \closein\inFile
+% \end{macrocode}
+% We close output files for which this was the last input file.
+% \begin{macrocode}
+ \csname e@#1\endcsname
+% \end{macrocode}
+% If the user was interested in statistics, we inform him of the
+% number of lines processed, the number of comments that were
+% either removed or passed and the number of codelines that were
+% written to the output file. Also the totals are updated.
+% \begin{macrocode}
+%<*stats>
+ \Msg{Lines \space processed: \the\processedLines^^J%
+ Comments removed: \the\commentsRemoved^^J%
+ Comments \space passed: \the\commentsPassed^^J%
+ Codelines passed: \the\codeLinesPassed^^J}%
+ \global\advance\TotalprocessedLines by \processedLines
+ \global\advance\TotalcommentsRemoved by \commentsRemoved
+ \global\advance\TotalcommentsPassed by \commentsPassed
+ \global\advance\TotalcodeLinesPassed by \codeLinesPassed
+%</stats>
+% \end{macrocode}
+% The |\NumberOfFiles| need to be known even if no statistics are
+% gathered so we update it always.
+% \changes{2.4h}{1997/07/07}{update \cs{NumberOfFiles} even if stats are
+% not gathered pr/2429}
+% \begin{macrocode}
+ \global\advance\NumberOfFiles by \@ne
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\showfiles@do}
+% \changes{2.4a}{1996/10/02}{Macro added (MW)}
+% A message is displayed on the terminal telling the user what we
+% are about to do. For each open output file we display one line
+% saying what options it is generated with and the off-counter
+% associated with the file is zeroed. First line contains also name
+% of input file.
+% Names of output files that are closed are appended to
+% |\refusedfiles|.
+% \begin{macrocode}
+\def\showfiles@do#1#2{%
+ \ifnum#1=\stream@closed
+ \@addto\refusedfiles{\noexpand\do#1{#2}}%
+ \else
+ \Msg{\@msg
+ \ifx>#2>\else\space(#2)\fi
+ \space -> \@stripstring#1}
+ \change@msg
+ \csname off@\number#1\endcsname=\z@
+ \fi
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\makeoutlist@do}
+% \changes{2.3b}{1995/08/22}{Macro added --- pre-constructed
+% off-counters' names}
+% This macro selects only open output files and constructs names for
+% off-counters.
+% \begin{macrocode}
+\def\makeoutlist@do#1#2{%
+ \ifnum#1=\stream@closed\else
+ \noexpand\do#1{#2}\csname off@\number#1\endcsname
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\openoutput}
+% \changes{2.3e}{1996/10/02}{Change for ``open lists'' -- renamed from
+% \cs{ensureopen@do}}
+% \changes{2.4a}{1996/06/06}{Check whether there are streams left (MDW)}
+% This macro opens output streams if possible.
+% \begin{macrocode}
+\def\openoutput#1{%
+% \end{macrocode}
+% If both maxfile counters are non-zero\dots
+% \begin{macrocode}
+ \if 1\ifnum\@maxfiles=\z@ 0\fi
+ \ifnum\@maxoutfiles=\z@ 0\fi1%
+% \end{macrocode}
+% \dots the stream may be opened and counters decremented. But if
+% that cannot be done\dots
+% \begin{macrocode}
+ \advance\@maxfiles\m@ne
+ \advance\@maxoutfiles\m@ne
+ \StreamOpen#1%
+ \WritePreamble#1%
+ \else
+% \end{macrocode}
+% \dots the file is added to the ``refuse list''.
+% \begin{macrocode}
+ \@addto\refusedfiles{\noexpand\openoutput#1}%
+ \fi
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\closeoutput}
+% \changes{2.4a}{1996/06/06}
+% {Don't close the file if it's not open (MDW)}
+% This macro closes open output stream when it is no longer
+% needed and increments maxfiles counters.
+% \begin{macrocode}
+\def\closeoutput#1{%
+ \ifnum#1=\stream@closed\else
+ \WritePostamble#1%
+ \StreamClose#1%
+ \advance\@maxfiles\@ne
+ \advance\@maxoutfiles\@ne
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsubsection{Preamble and postamble}
+%
+% \begin{macro}{\ds@heading}
+% \changes{2.3e}{1996/09/16}{Macro added.}
+% This is a couple of lines, stating what file is being written and
+% how it was created.
+% \begin{macrocode}
+\def\ds@heading{%
+ \MetaPrefix ^^J%
+ \MetaPrefix\space This is file `\outFileName',^^J%
+ \MetaPrefix\space generated with the docstrip utility.^^J%
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\AddGenerationDate}
+% \changes{2.3d}{1995/11/17}{(DPC) Macro added.}
+% Older versions of \ds{} added the date that any file was generated
+% and the version number of \ds{}. This confused some people as they
+% mistook this for the version/date of the file that was being
+% written. So now this information is not normally written, but
+% a batch file may call this to get an old style header.
+% \begin{macrocode}
+\def\AddGenerationDate{%
+ \def\ds@heading{%
+ \MetaPrefix ^^J%
+ \MetaPrefix\space This is file `\outFileName', generated %
+ on <\the\year/\the\month/\the\day> ^^J%
+ \MetaPrefix\space with the docstrip utility (\fileversion).^^J%
+ }}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\declarepreamble}
+% \changes{2.3a}{1995/08/18}{renamed from \cs{preamble};
+% interface changed}
+% \changes{2.0e}{1991/06/01}{Macro added.}
+% \changes{2.3e}{1995/09/25}
+% {Change for batchfiles working by \cs{input}}
+% \changes{2.3e}{1996/09/16}{Change to allow customization.}
+% When a batch file is used the
+% user can specify a preamble of his own that will be written to
+% each file that is created. This can be useful to include an extra
+% copyright notice in the stripped version of a file. Also a
+% warning that both versions of a file should {\em always\/} be
+% distributed together could be written to a stripped file by
+% including it in such a preamble.
+%
+% Every line that is written to |\outFile| that belongs to the
+% preamble is preceded by two percent characters. This will prevent
+% \ds{} from stripping these lines off the file.
+%
+% The preamble should be started with the macro
+% |\declarepreamble|; it is ended by |\endpreamble|. All
+% processing is done within a group in order to be able to locally
+% change some values.
+%
+% |\ReferenceLines| is let equal |\relax| to be unexpandable.
+% \begin{macrocode}
+\let\inFileName\relax
+\let\outFileName\relax
+\let\ReferenceLines\relax
+\def\declarepreamble{\begingroup
+\catcode`\^^M=13 \catcode`\ =12 %
+\declarepreambleX}
+{\catcode`\^^M=13 %
+\gdef\declarepreambleX#1#2
+\endpreamble{\endgroup%
+ \def^^M{^^J\MetaPrefix\space}%
+ \edef#1{\ds@heading%
+ \ReferenceLines%
+ \MetaPrefix\space\checkeoln#2\empty}}%
+\gdef\checkeoln#1{\ifx^^M#1\else\expandafter#1\fi}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\declarepostamble}
+% \changes{2.0e}{1991/06/01}{Macro added.}
+% \changes{2.3e}{1995/09/25}
+% {Change for batchfiles working by \cs{input}}
+% Just as a preamble can be
+% specified in a batch file, the same can be done for a {\em
+% post\/}amble.
+%
+% The definition of |\declarepostamble| is very much like the
+% definition above of |\declarepreamble|.
+% \begin{macrocode}
+\def\declarepostamble{\begingroup
+\catcode`\ =12 \catcode`\^^M=13
+\declarepostambleX}
+{\catcode`\^^M=13 %
+\gdef\declarepostambleX#1#2
+\endpostamble{\endgroup%
+ \def^^M{^^J\MetaPrefix\space}%
+ \edef#1{\MetaPrefix\space\checkeoln#2\empty^^J%
+ \MetaPrefix ^^J%
+ \MetaPrefix\space End of file `\outFileName'.%
+ }}%
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\usepreamble}
+% \begin{macro}{\usepostamble}
+% Macros for selecting [pre/post]amble to be used.
+% \begin{macrocode}
+\def\usepreamble#1{\def\currentpreamble{#1}}
+\def\usepostamble#1{\def\currentpostamble{#1}}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\nopreamble}
+% \changes{2.4i}{1998/01/18}{Macro added. pr/2726}
+% \begin{macro}{\nopostamble}
+% \changes{2.4i}{1998/01/18}{Macro added. pr/2726}
+% Shortcuts for disabling the writing of [pre/post]ambles.
+% This is not done by disabling |\WritePreamble| or |\WritePostamble|
+% since that wouldn't
+% revertable afterwards. Instead the empty [pre/post]ambles are handled
+% specially in those macros.
+% \begin{macrocode}
+\def\nopreamble{\usepreamble\empty}
+\def\nopostamble{\usepostamble\empty}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\preamble}
+% \changes{2.3c}{1995/08/28}{Bug fixed: default preamble is now selected
+% not only defined}
+% \begin{macro}{\postamble}
+% \changes{2.3c}{1995/08/28}{As for \cs{preamble}}
+% For backward compatibility we provide these macros defining
+% default preamble and postamble.
+% \begin{macrocode}
+\def\preamble{\usepreamble\defaultpreamble
+ \declarepreamble\defaultpreamble}
+\def\postamble{\usepostamble\defaultpostamble
+ \declarepostamble\defaultpostamble}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+% \begin{macro}{\org@preamble}
+% \changes{2.3a}{1995/08/18}{Macro added}
+% \changes{2.3c}{1995/11/16}{With \cs{inFileName} again}
+% \begin{macro}{\org@postamble}
+% \changes{2.3a}{1995/08/18}{Macro added}
+% Default values to use if nothing different is provided.
+% \changes{2.2j}{1995/08/06}{Updated default preamble}
+% \changes{2.5a}{1998/04/03}{Updated default preamble}
+% \begin{macrocode}
+\declarepreamble\org@preamble
+
+IMPORTANT NOTICE:
+
+For the copyright see the source file.
+
+Any modified versions of this file must be renamed
+with new filenames distinct from \outFileName.
+
+For distribution of the original source see the terms
+for copying and modification in the file \inFileName.
+
+This generated file may be distributed as long as the
+original source files, as listed above, are part of the
+same distribution. (The sources need not necessarily be
+in the same archive or directory.)
+\endpreamble
+% \end{macrocode}
+%
+% \begin{macrocode}
+\edef\org@postamble{\string\endinput^^J%
+ \MetaPrefix ^^J%
+ \MetaPrefix\space End of file `\outFileName'.%
+ }
+% \end{macrocode}
+%
+% \begin{macrocode}
+\let\defaultpreamble\org@preamble
+\let\defaultpostamble\org@postamble
+% \end{macrocode}
+%
+% \begin{macrocode}
+\usepreamble\defaultpreamble
+\usepostamble\defaultpostamble
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+% \begin{macro}{\originaldefault}
+% \changes{2.5a}{1998/04/03}{Macro added}
+% \changes{2.5b}{1998/04/28}{Macro renamed from \cs{orginaldefault}
+% to \cs{originaldefault}}
+% The default preamble header changed in v2.5 to allow distribution
+% of generated files as long as source also distributed. If you need
+% the original default, not allowing distribution of generated files
+% add |\usepreamble\originaldefault| to your .ins files.
+% Note then that your file can not be included in most TeX distributions
+% on CD which are distributed `pre-installed' with all \LaTeX\ files
+% extracted form th edocumented sources and moved to a suitable
+% directory in \TeX's search path.
+% \begin{macrocode}
+\declarepreamble\originaldefault
+
+IMPORTANT NOTICE:
+
+For the copyright see the source file.
+
+You are *not* allowed to modify this file.
+
+You are *not* allowed to distribute this file.
+For distribution of the original source see the terms
+for copying and modification in the file \inFileName.
+
+\endpreamble
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\WritePreamble}
+% \changes{2.0e}{1991/06/01}{Macro added.}
+% \changes{2.3c}{1995/11/16}{Added definitions of \cs{inFileName} and
+% \cs{outFileName}}
+% \changes{2.3d}{1995/11/17}{(DPC) Macro added.}
+% \changes{2.4i}{1998/01/18}{Test for \cs{empty} postamble and
+% don't write it out. pr/2726}
+% \begin{macrocode}
+\def\WritePreamble#1{%
+% \end{macrocode}
+% We write out only non-empty preambles.
+% \begin{macrocode}
+ \expandafter\ifx\csname pre@\@stripstring#1\endcsname\empty
+ \else
+ \edef\outFileName{\@stripstring#1}%
+% \end{macrocode}
+% Then the reference lines that tell from what source file(s) the
+% stripped file was created and user supplied preamble.
+% \begin{macrocode}
+ \StreamPut#1{\csname pre@\@stripstring#1\endcsname}%
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\WritePostamble}
+% \changes{2.0e}{1991/06/01}{Macro added.}
+% \changes{2.3c}{1995/11/16}{Added defs of \cs{inFileName} and
+% \cs{outFileName}}
+% \changes{2.4i}{1998/01/18}{Test for \cs{empty} postamble and
+% don't write it out. pr/2726}
+% Postamble attributed to |#1| is written out. The
+% last line written identifies the file again.
+% \begin{macrocode}
+\def\WritePostamble#1{%
+% \end{macrocode}
+% We write out only non-empty postambles.
+% \begin{macrocode}
+ \expandafter\ifx\csname post@\@stripstring#1\endcsname\empty
+ \else
+ \edef\outFileName{\@stripstring#1}%
+ \StreamPut#1{\csname post@\@stripstring#1\endcsname}%
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{Support for writing to specified directories}
+%
+% As we've seen before every output file is written to directory
+% specifed by the value of |\destdir| current at the moment of
+% this file's |\file| declaration.
+%
+% \begin{macro}{\usedir}
+% \changes{2.3e}{1995/09/15}{Macro added}
+% This macro when called should translate its one argument into a
+% directory name and define |\destdir| to that value. The default
+% for |\usedir| is to ignore its argument and return name of
+% current directory (if known). This can be changed by commands
+% from |docstrip.cfg| file.
+%
+% |\showdirectory| is used just to display directory name for
+% user's information.
+% \begin{macrocode}
+\def\usedir#1{\edef\destdir{\WriteToDir}}
+\def\showdirectory#1{\WriteToDir}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\BaseDirectory}
+% \changes{2.3e}{1995/09/15}{Macro added}
+% \changes{2.4e}{1996/10/22}{\cs{@setwritetodir} added (DPC)}
+% This is config file command for specifing root directory of the
+% \TeX{} hierarchy. It enables the whole directory
+% selecting mechanism by redefining |\usedir|.
+% First make sure that the directory syntax commands have been set
+% up by calling |\@setwritedir|, so that the value of |\dirsep|
+% used by the |\edef| is (hopefully) correct.
+% \begin{macrocode}
+\def\BaseDirectory#1{%
+ \@setwritetodir
+ \let\usedir\alt@usedir
+ \let\showdirectory\showalt@directory
+ \edef\basedir{#1\dirsep}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\convsep}
+% \changes{2.3e}{1995/09/15}{Macro added}
+% This macro loops through slashes in its argument replacing them
+% with current |\dirsep|. It should be called
+% |\convsep some/directory/name/\qStop| (with slash on the end).
+% \begin{macrocode}
+\def\convsep#1/#2\qStop{%
+ #1\ifx\qStop#2\qStop \pesvnoc\fi\convsep\dirsep#2\qStop}
+\def\pesvnoc#1\qStop{\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\alt@usedir}
+% \changes{2.3e}{1995/09/15}{Macro added}
+% Directory name construction macro enabling writing to various
+% directories.
+% \begin{macrocode}
+\def\alt@usedir#1{%
+ \Name\ifx{dir@#1}\relax
+ \undefined@directory{#1}%
+ \else
+ \edef\destdir{\csname dir@#1\endcsname}%
+ \fi}
+\def\showalt@directory#1{%
+ \Name\ifx{dir@#1}\relax
+ \showundef@directory{#1}%
+ \else\csname dir@#1\endcsname\fi}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\undefined@directory}
+% \changes{2.4a}{1996/10/04}{Macro added (MW)}
+% \changes{2.4e}{1996/10/22}{Help text added (DPC)}
+% This macro comes into action when undefined label is spotted. The
+% action is to raise an error and define |\destdir| to point to the
+% current directory.
+% \begin{macrocode}
+\def\undefined@directory#1{%
+ \errhelp{docstrip.cfg should specify a target directory for^^J%
+ #1 using \DeclareDir or \UseTDS.}%
+ \errmessage{You haven't defined the output directory for `#1'.^^J%
+ Subsequent files will be written to the current directory}%
+ \let\destdir\WriteToDir
+ }
+\def\showundef@directory#1{UNDEFINED (label is #1)}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\undefined@TDSdirectory}
+% \changes{2.4a}{1996/10/04}{Macro added (MW)}
+% This happens when label is undefined while using TDS. The label
+% is converted to use proper separators and appended to base
+% directory name.
+% \begin{macrocode}
+\def\undefined@TDSdirectory#1{%
+ \edef\destdir{%
+ \basedir\convsep#1/\qStop
+ }}
+\def\showundef@TDSdirectory#1{\basedir\convsep#1/\qStop}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\UseTDS}
+% \changes{2.4a}{1996/10/04}{Macro added (MW)}
+% \changes{2.4e}{1996/10/22}{\cs{@setwritetodir} added (DPC)}
+% Change of behaviour for undefined labels is done simply:
+% \begin{macrocode}
+\def\UseTDS{%
+ \@setwritetodir
+ \let\undefined@directory\undefined@TDSdirectory
+ \let\showundef@directory\showundef@TDSdirectory
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\DeclareDir}
+% \changes{2.3e}{1995/09/15}{Macro added}
+% \changes{2.4e}{1996/10/22}{\cs{@setwritetodir} added (DPC)}
+% This macro remaps some directory name to another.
+% \begin{macrocode}
+\def\DeclareDir{\@ifnextchar*{\DeclareDirX}{\DeclareDirX\basedir*}}
+\def\DeclareDirX#1*#2#3{%
+ \@setwritetodir
+ \Name\edef{dir@#2}{#1#3}}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \subsubsection{Compatibility with older versions}
+%
+% \begin{macro}{\generateFile}
+% Main macro of previous versions of \ds.
+% \begin{macrocode}
+\def\generateFile#1#2#3{{%
+ \ifx t#2\askforoverwritetrue
+ \else\askforoverwritefalse\fi
+ \generate{\file{#1}{#3}}%
+ }}
+% \end{macrocode}
+% \end{macro}
+%
+% To support command files that were written for the first version
+% of \ds{} the commands |\include| and |\processFile|
+% are defined here. The use of this interface is not recommended
+% as it may be removed in a future release of \ds{}.
+%
+% \begin{macro}{\include}
+% \changes{2.0f}{1991/06/04}{Macro added} To provide the \ds{} program
+% with a list of options that should be included in the output the
+% command \verb=\include{=\meta{Options}\verb=}= can be used. This
+% macro is meant to be used in conjunction with the
+% |\processFile| command.
+% \begin{macrocode}
+\def\include#1{\def\Options{#1}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\processFile}
+% \changes{2.0f}{1991/06/04}{Supply \texttt{\bsl generateFile} with
+% \texttt{\bsl Options}}
+%\DeleteShortVerb\|
+% The macro
+% \verb=\processFile{=\meta{filename}\verb=}{=\meta{inext}\verb=}{=%
+%\unskip\meta{outext}\verb=}{=\meta{t{\fontshape{n}\ttfamily|}f}\verb=}=
+% can be used when a single input file is used to produce
+% a single output file. The macro is also used in the interactive
+% mode of the \ds{} program.
+%\MakeShortVerb\|
+%
+% The arguments \meta{inext} and \meta{outext} denote the
+% extensions of the input and output files respectively. The fourth
+% argument can be used to specify if an existing file should be
+% overwritten without asking. If \meta{t} is specified the program
+% will ask for permission before overwriting an existing file.
+%
+% This macro is defined using the more generic macro |\generateFile|.
+% \begin{macrocode}
+\def\processFile#1#2#3#4{%
+ \generateFile{#1.#3}{#4}{\from{#1.#2}{\Options}}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\processfile}
+% \begin{macro}{\generatefile}
+% \changes{2.0m}{1991/04/23}{Now issue a warning when \cs{processfile}
+% or \cs{generatefile} are used}
+% Early
+% versions of \ds{} defined |\processfile| and
+% |\generatefile| instead of the commands as they are defined in
+% this version. To remain upwards compatible, we still provide
+% these commands, but issue a warning when they are used.
+% \begin{macrocode}
+\def\processfile{\Msg{%
+ ^^Jplease use \string\processFile\space instead of
+ \string\processfile!^^J}%
+ \processFile}
+\def\generatefile{\Msg{%
+ ^^Jplease use \string\generateFile\space instead of
+ \string\generatefile!^^J}%
+ \generateFile}
+% \end{macrocode}
+% \end{macro}
+% \end{macro}
+%
+%
+% \subsection{Limiting open file streams}
+%
+% (This section was written by Mark Wooding)
+%
+% \begin{macro}{\maxfiles}
+% \changes{2.4a}{1996/06/06}{Macro added (MDW)}
+% Some operating systems with duff libraries or other restrictions
+% can't cope with all the files which \ds\ tries to output at once.
+% A configuration file can say |\maxfiles{|\meta{number}|}| to
+% describe the maximum limit for the environment.
+%
+% I'll need a counter for this value, so I'd better allocate one.
+%
+% \begin{macrocode}
+\newcount\@maxfiles
+% \end{macrocode}
+%
+% The configuration command |\maxfiles| is just slightly prettier than
+% an assignment, for \LaTeX\ people. It also gives me an opportunity
+% to check that the limit is vaguely sensible. I need at least 4
+% streams:
+% \begin{enumerate}
+% \item A batch file.
+% \item A sub batch file, which \LaTeX's installation utility uses.
+% \item An input stream for reading an unstripped file.
+% \item An output stream for writing a stripped file.
+% \end{enumerate}
+%
+% \begin{macrocode}
+\def\maxfiles#1{%
+ \@maxfiles#1\relax
+ \ifnum\@maxfiles<4
+ \errhelp{I'm not a magician. I need at least four^^J%
+ streams to be able to work properly, but^^J%
+ you've only let me use \the\@maxfiles.}%
+ \errmessage{\noexpand\maxfiles limit is too strict.}%
+ \@maxfiles4
+ \fi
+}
+% \end{macrocode}
+%
+% \changes{2.4a}{1996/10/03}{No default limit since batchfiles are now
+% \cs{input} (MW)}
+% Since batchfiles are now |\input|ed there should be no default limit
+% here. I'll just use some abstract large number.
+% \begin{macrocode}
+\maxfiles{1972} % year of my birth (MW)
+% \end{macrocode}
+%
+% \end{macro}
+%
+% \begin{macro}{\maxoutfiles}
+% \changes{2.4a}{1996/06/06}{Macro added (MDW)}
+%
+% Maybe there's a restriction on just output streams. (Well, there is:
+% I know, because \TeX\ only allows 16.) I may as well allow the
+% configuration to set this up.
+%
+% Again, I need a counter.
+%
+% \begin{macrocode}
+\newcount\@maxoutfiles
+% \end{macrocode}
+%
+% And now the macro. I need at least one output stream which I think is
+% reasonable.
+%
+% \begin{macrocode}
+\def\maxoutfiles#1{%
+ \@maxoutfiles=#1\relax
+ \ifnum\@maxoutfiles<1
+ \@maxoutfiles1
+ \errhelp{I'm not a magician. I need at least one output^^J%
+ stream to be able to do anything useful at all.^^J%
+ Please be reasonable.}%
+ \errmessage{\noexpand\maxoutfiles limit is insane}%
+ \fi
+}
+% \end{macrocode}
+%
+% The default limit is 16, because that's what \TeX\ says.
+%
+% \begin{macrocode}
+\maxoutfiles{16}
+% \end{macrocode}
+%
+% \end{macro}
+%
+% \begin{macro}{\checkfilelimit}
+%
+% This checks the file limit when a new batch file is started. If
+% there's fewer than two files left here, we're not going to be able
+% to strip any files. The file limit counter is local to the group
+% which is set up around |\batchinput|, so that's all pretty cool.
+%
+% \begin{macrocode}
+\def\checkfilelimit{%
+ \advance\@maxfiles\m@ne
+ \ifnum\@maxfiles<2 %
+ \errhelp{There aren't enough streams left to do any unpacking.^^J%
+ I can't do anything about this, so complain at the^^J%
+ person who made such a complicated installation.}%
+ \errmessage{Too few streams left.}%
+ \end
+ \fi
+}
+% \end{macrocode}
+%
+% \end{macro}
+%
+% \subsection{Interaction with the user}
+%
+% \begin{macro}{\strip@meaning}
+% Throw away the first part of |\meaning| output.
+% \changes{2.4c}{1996/06/11}{Macro added (DPC)}
+% \begin{macrocode}
+\def\strip@meaning#1>{}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\processbatchFile}
+% \changes{2.0f}{1991/06/04}{Macro added.}
+% \changes{2.3e}{1995/09/25}{Batch file is \cs{input}ed not \cs{read}}
+% When \ds{} is run it always tries to use a batch file.
+%
+% For this purpose it calls the macro |\processbatchFile|.
+%
+% \changes{2.4a}{1996/06/06}
+% {Added check for file limits (MDW)}
+% \changes{2.4c}{1996/06/11}
+% {Add \cs{jobname} checks (DPC)}
+% \changes{2.4d}{1996/06/17}
+% {Move \cs{jobname} checks to top level (DPC)}
+% The first thing is to check if there are any input streams left.
+% \begin{macrocode}
+\def\processbatchFile{%
+ \checkfilelimit
+ \let\next\relax
+% \end{macrocode}
+% Now we try to open the batch file for reading.
+% \begin{macrocode}
+ \openin\inputcheck \batchfile\relax
+ \ifeof\inputcheck
+% \end{macrocode}
+% If we didn't succeed in opening the file, we assume that it does
+% not exist. If we tried the default filename, we silently
+% continue; the \ds{} program will switch to interactive mode in
+% this case.
+% \begin{macrocode}
+ \ifDefault
+ \else
+% \end{macrocode}
+% \changes{2.4d}{1996/10/17}{Missing batchfile an error (DPC)}
+% If we failed to open the user-supplied file, something is wrong
+% and we warn him about it. This will also result in a switch to
+% interactive mode.
+% \begin{macrocode}
+ \errhelp
+ {A batchfile specified in \batchinput could not be found.}%
+ \errmessage{^^J%
+ **************************************************^^J%
+ * Could not find your \string\batchfile=\batchfile.^^J%
+ **************************************************}%
+ \fi
+ \else
+% \end{macrocode}
+% When we were successful in opening a file, we again have to check
+% whether it was the default file. In that case we tell the user
+% we found that file and ask him if he wants to use it.
+% \begin{macrocode}
+ \ifDefault
+ \Msg{**************************************************^^J%
+ * Batchfile \DefaultbatchFile\space found Use it? (y/n)?}%
+ \Ask\answer{%
+ **************************************************}%
+ \else
+% \end{macrocode}
+% When it was the user-supplied file we can safely assume he wants
+% to use it so we set |\answer| to \texttt{y}.
+% \begin{macrocode}
+ \let\answer\y
+ \fi
+% \end{macrocode}
+% If the macro |\answer| contains a \texttt{y} we can read in the
+% batchfile. We do it in an indirect way---after completing |\if|s.
+% \begin{macrocode}
+ \ifx\answer\y
+ \closein\inputcheck
+ \def\next{\@@input\batchfile\relax}%
+ \fi
+ \fi
+ \next}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\ReportTotals}
+% \changes{2.0g}{1991/06/05}{Macro added.} The macro
+% |\ReportTotals| can be used to report total statistics for
+% all files processed. This code is only included in the program if
+% the option \texttt{stats} is included.
+% \begin{macrocode}
+%<*stats>
+\def\ReportTotals{%
+ \ifnum\NumberOfFiles>\@ne
+ \Msg{Overall statistics:^^J%
+ Files \space processed: \the\NumberOfFiles^^J%
+ Lines \space processed: \the\TotalprocessedLines^^J%
+ Comments removed: \the\TotalcommentsRemoved^^J%
+ Comments \space passed: \the\TotalcommentsPassed^^J%
+ Codelines passed: \the\TotalcodeLinesPassed}%
+ \fi}
+%</stats>
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\SetFileNames}
+% The macro |\SetFileNames| is used when the program runs in
+% interactive mode and the user was asked to supply extensions and
+% a list of filenames.
+% \begin{macrocode}
+\def\SetFileNames{%
+ \edef\sourceFileName{\MainFileName.\infileext}%
+ \edef\destFileName{\MainFileName.\outfileext}}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\CheckFileNames}
+% In interactive mode, the user gets asked for the extensions for
+% the input and output files. Also the name or names of the input
+% files (without extension) is asked for. Then the names of the
+% input and output files are constructed from this information by
+% |\SetFileNames|. This assumes that the name of the input file is
+% the same as the name of the output file. But we should not write
+% to the same file we're reading from so the extensions should
+% differ.
+%
+% The macro |\CheckFileNames| makes sure that the output goes to a
+% different file to the one where the input comes from.
+% \begin{macrocode}
+\def\CheckFileNames{%
+ \ifx\sourceFileName\destFileName
+% \end{macrocode}
+% If input and output files are the same we signal an error and stop
+% processing.
+% \begin{macrocode}
+ \Msg{^^J%
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^^J%
+ ! It is not possible to read from and write to the same file !^^J%
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^^J}%
+ \Continuefalse
+ \else
+% \end{macrocode}
+% If they are not the same we check if the input file exists by
+% trying to open it for reading.
+% \begin{macrocode}
+ \Continuetrue
+ \immediate\openin\inFile \sourceFileName\relax
+ \ifeof\inFile
+% \end{macrocode}
+% If an end of file was found, the file couldn't be opened, so we
+% signal an error and stop processing.
+% \begin{macrocode}
+ \Msg{^^J%
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^^J%
+ ! Your input file `\sourceFileName' was not found !^^J%
+ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!^^J}%
+ \Continuefalse
+ \else
+% \end{macrocode}
+% The last check we have to make is if the output file already
+% exists. Therefore we try to open it for reading.
+% As a precaution we first close the input stream.
+% \changes{2.0p}{1992/06/26}{Added \cs{WriteToDir} (FMi).}
+% \changes{2.0r}{1992/08/17}{Use \cs{inFile} for reading}
+% \changes{2.0r}{1992/08/17}{Moved \cs{closein} statements}
+% \begin{macrocode}
+ \immediate\closein\inFile
+ \immediate\openin\inFile\destdir \destFileName\relax
+ \ifeof\inFile
+% \end{macrocode}
+% If this fails, it didn't exist and all is well.
+% \begin{macrocode}
+ \Continuetrue
+ \else
+% \end{macrocode}
+% If opening of the output file for reading succeeded we have to
+% ask the user if he wants to overwrite it. We assume he doesn't
+% want to overwrite it, so the switch |\ifContinue| is initially
+% set to \meta{false}. Only if he answers the question positively
+% with `\texttt{y}' or `\texttt{yes}' we set the switch back to
+% \meta{true}.
+% \changes{2.0p}{1992/06/26}{Changed question about overwriting.}
+% \begin{macrocode}
+ \Continuefalse
+ \Ask\answer{File \destdir\destFileName\space already
+ exists
+ \ifx\empty\destdir somewhere \fi
+ on the system.^^J%
+ Overwrite it%
+ \ifx\empty\destdir\space if necessary\fi
+ ? [y/n]}%
+ \ifx\y \answer \Continuetrue \else
+ \ifx\yes\answer \Continuetrue \else
+ \fi\fi
+ \fi
+% \end{macrocode}
+% All checks have been performed now, so we can close any file that
+% was opened just for this purpose.
+% \begin{macrocode}
+ \fi
+ \fi
+ \closein\inFile}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\interactive}
+% The macro |\interactive| implements the interactive mode of the
+% \ds{} program. The macro is implemented using the
+% \meta{while} construction. While the switch |\ifMoreFiles| remains
+% true, we continue processing.
+% \begin{macrocode}
+\def\interactive{%
+ \whileswitch\ifMoreFiles\fi%
+% \end{macrocode}
+% To keep macro redefinitions local we start a group and ask the
+% user some questions about what he wants us to do.
+% \begin{macrocode}
+ {\begingroup
+ \AskQuestions
+% \end{macrocode}
+% The names of the files that have to be processed are stored as a
+% comma-separated list in the macro |\filelist| by |\AskQuestions|.
+% We use a \meta{for} loop to process the files one by one.
+% \begin{macrocode}
+ \forlist\MainFileName:=\filelist
+ \do
+% \end{macrocode}
+% First the names of the input and output files are constructed
+% and a check is made if all filename information is correct.
+% \begin{macrocode}
+ \SetFileNames
+ \CheckFileNames
+ \ifContinue
+% \end{macrocode}
+% If everything was well, produce output file.
+% \changes{2.0q}{1992/07/01}{Preceded filename by \cs{WriteToDir}}
+% \begin{macrocode}
+ \generateFile{\destFileName}{f}%
+ {\from{\sourceFileName}{\Options}}
+ \fi%
+% \end{macrocode}
+% This process is repeated until |\filelist| is exhausted.
+% \begin{macrocode}
+ \od
+ \endgroup
+% \end{macrocode}
+% Maybe the user wants more files to be processed, possibly with
+% another set of options, so we give him the opportunity.
+% \begin{macrocode}
+ \Ask\answer{More files to process (y/n)?}%
+ \ifx\y \answer\MoreFilestrue \else
+ \ifx\yes\answer\MoreFilestrue \else
+% \end{macrocode}
+% If he didn't want to process any more files, the switch
+% |\ifMoreFiles| is set to \meta{false} in order to interrupt the
+% \meta{while} loop.
+% \begin{macrocode}
+ \MoreFilesfalse\fi\fi
+ }}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\AskQuestions}
+% \changes{2.0e}{1991/06/01}{Macro added.}
+% The macro |\AskQuestions| is called by |\interactive| to get
+% some information from the user concerning the files that need
+% to be processed.
+% \begin{macrocode}
+\def\AskQuestions{%
+ \Msg{^^J%
+ ****************************************************}%
+% \end{macrocode}
+% We want to know the extension of the input files,
+% \begin{macrocode}
+ \Ask\infileext{%
+ * First type the extension of your input file(s): \space *}%
+ \Msg{****************************************************^^J^^J%
+ ****************************************************}%
+% \end{macrocode}
+% the extension of the output files,
+% \begin{macrocode}
+ \Ask\outfileext{%
+ * Now type the extension of your output file(s) \space: *}%
+ \Msg{****************************************************^^J^^J%
+ ****************************************************}%
+% \end{macrocode}
+% if options are to be included and
+% \begin{macrocode}
+ \Ask\Options{%
+ * Now type the name(s) of option(s) to include \space\space: *}%
+ \Msg{****************************************************^^J^^J%
+ ****************************************************^^J%
+ * Finally give the list of input file(s) without \space\space*}%
+% \end{macrocode}
+% the name of the input file or a list of names, separated by commas.
+% \begin{macrocode}
+ \Ask\filelist{%
+ * extension seperated by commas if necessary %
+ \space\space\space\space: *}%
+ \Msg{****************************************************^^J}}%
+% \end{macrocode}
+% \end{macro}
+%
+% \subsection{The main program}
+% When \TeX\ processes the \ds{} program it displays
+% a message about the version of the program and its function
+% on the terminal.
+% \begin{macrocode}
+\Msg{Utility: `docstrip' \fileversion\space <\filedate>^^J%
+ English documentation \space\space\space <\docdate>}%
+\Msg{^^J%
+ **********************************************************^^J%
+ * This program converts documented macro-files into fast *^^J%
+ * loadable files by stripping off (nearly) all comments! *^^J%
+ **********************************************************^^J}%
+% \end{macrocode}
+%
+%
+% \begin{macro}{\WriteToDir}
+% Macro |\WriteToDir| is either empty or holds the prefix
+% necessary to read a file from the current directory. Under UNIX
+% this is |./| but a lot of other systems addopted this concept.
+% This macro is a default value for |\destdir|.
+%
+% The definition of this macro is now delayed until |\@setwritedir|
+% is called.
+% \changes{2.0p}{1992/06/26}{Macro added (FMi).}
+% \changes{2.2a}{1993/12/02}{check texsys file}
+% \changes{2.2d}{1994/01/20}{do not read dircheck/texsys file}
+% \changes{2.4e}{1996/10/22}{set in \cs{@setwritedir} (DPC)}
+% \end{macro}
+%
+% \begin{macro}{\makepathname}
+% \changes{2.3e}{1995/10/24}{Macro added}
+% \changes{2.4e}{1996/10/22}{set in \cs{@setwritedir} (DPC)}
+% This macro should define |\@pathname| to full path name made by
+% combining current value of |\destdir| with its one argument being
+% a file name. Its default value defined here is suitable for
+% \textsc{unix, ms-dos} and Macintosh, but for some systems it may
+% be needed to redefine this in \texttt{docstrip.cfg} file. We
+% provide such redefinition for VMS here.
+%
+% Macro |\dirsep| holds directory separator specific for a
+% system. Default value suitable for UNIX and DOS is slash. It
+% comes in action when |\usedir| labels are used directly.
+%
+% The definition of this macro is now delayed until |\@setwritedir|
+% is called.
+% \end{macro}
+%
+% \begin{macro}{\@setwritedir}
+% \changes{2.4e}{1996/10/22}{macro added (DPC)}
+% The following tests try to automatically set |\WriteToDir|,
+% |\dirname| and |\makepathname| in Unix, Mac, or VMS style.
+% The tests are not run at the top level but held in this macro
+% so that a configuration file has a chance to define |\WriteToDir|
+% which allows the other two to be set automatically. The tests could
+% more simply be run after the configuration file is read, but the
+% configuration commands like |\BaseDirectory| need (at least at
+% present) to have |\dirsep| correctly defined. It does not define
+% any command that is already defined, so by defining these commands
+% a configuration file can produce different effects for special needs.
+% So this command is called by |BaseDirectory|, |\UseTDS|,
+% |\DeclareDir| and finally at the top level after the cfg is run.
+% It begins by redefining itself to be a no-op so it effectively is
+% only called once.
+% \begin{macrocode}
+\def\@setwritetodir{%
+ \let\setwritetodir\relax
+% \end{macrocode}
+%
+% \begin{macrocode}
+ \ifx\WriteToDir\@undefined
+ \ifx\@currdir\@undefined
+ \def\WriteToDir{}%
+ \else
+ \let\WriteToDir\@currdir
+ \fi
+ \fi
+% \end{macrocode}
+%
+% \begin{macrocode}
+ \let\destdir\WriteToDir
+% \end{macrocode}
+%
+% VMS Style.
+% \begin{macrocode}
+ \def\tmp{[]}%
+ \ifx\tmp\WriteToDir
+ \ifx\dirsep\@undefined
+ \def\dirsep{.}%
+ \fi
+ \ifx\makepathname\@undefined
+ \def\makepathname##1{%
+ \edef\@pathname{\ifx\WriteToDir\destdir
+ \WriteToDir\else[\destdir]\fi##1}}%
+ \fi
+ \fi
+% \end{macrocode}
+%
+% Unix and Mac styles.
+% \begin{macrocode}
+ \ifx\dirsep\@undefined
+ \def\dirsep{/}%
+ \def\tmp{:}%
+ \ifx\tmp\WriteToDir
+ \def\dirsep{:}%
+ \fi
+ \fi
+% \end{macrocode}
+%
+% \begin{macrocode}
+ \ifx\makepathname\@undefined
+ \def\makepathname##1{%
+ \edef\@pathname{\destdir\ifx\empty\destdir\else
+ \ifx\WriteToDir\destdir\else\dirsep\fi\fi##1}}%
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+%
+% If the user has a |docstrip.cfg| file, use it now.
+% \changes{2.4d}{1995/10/17}{Move config file test to outer level (DPC)}
+% This macro tries to read \texttt{docstrip.cfg} file. If this
+% succeeds executes its first argument, otherwise the second.
+% \begin{macrocode}
+\immediate\openin\inputcheck=docstrip.cfg\relax
+\ifeof\inputcheck
+ \Msg{%
+ ********************************************************^^J%
+ * No Configuration file found, using default settings. *^^J%
+ ********************************************************^^J}%
+\else
+ \Msg{%
+ ******************************************^^J%
+ * Using Configuration file docstrip.cfg. *^^J%
+ ******************************************^^J}%
+ \closein\inputcheck
+ \afterfi{\@@input docstrip.cfg\relax}
+\fi
+% \end{macrocode}
+%
+% Now run |\@setwritedir| in case it has not already been run
+% by a command in a configuration file.
+% \begin{macrocode}
+\@setwritetodir
+% \end{macrocode}
+%
+% \begin{macro}{\process@first@batchfile}
+% \changes{2.4d}{1996/10/17}
+% {Macro added (DPC)}
+% Process the batch file, and then terminate cleanly.
+% This may be set to |\relax| for `new style' batch files that
+% do not start with |\def\batchfile{|\ldots
+% \begin{macrocode}
+\def\process@first@batchfile{%
+ \processbatchFile
+ \ifnum\NumberOfFiles=\z@
+ \interactive
+ \fi
+ \endbatchfile}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\endbatchfile}
+% \changes{2.4d}{1996/10/17}
+% {Macro added (DPC)}
+% User level command to end batch file processing.
+% At the top level, returns totals and then stops \TeX.
+% At nested levels just does |\endinput|.
+% \begin{macrocode}
+\def\endbatchfile{%
+ \iftopbatchfile
+%<*stats>
+ \ReportTotals
+%</stats>
+ \expandafter\end
+ \else
+ \endinput
+ \fi}
+% \end{macrocode}
+% \end{macro}
+%
+% Now we see whether to process a batch file.
+% \changes{2.4d}{1996/10/17}
+% {Move default batchfile check to outer level (DPC)}
+%
+%
+% \begin{macro}{\@jobname}
+% \changes{2.4d}{1996/10/17}
+% {Macro added (DPC)}
+% Jobname (catcode 12)
+% \begin{macrocode}
+\edef\@jobname{\lowercase{\def\noexpand\@jobname{\jobname}}}%
+\@jobname
+% \end{macrocode}
+% \end{macro}
+%
+%
+% \begin{macro}{\@docstrip}
+% \changes{2.4d}{1996/10/17}
+% {Macro added (DPC)}
+% docstrip (catcode 12)
+% \begin{macrocode}
+\def\@docstrip{docstrip}%
+\edef\@docstrip{\expandafter\strip@meaning\meaning\@docstrip}
+% \end{macrocode}
+% \end{macro}
+%
+% First check whether the user has
+% defined the control sequence |\batchfile|. If he did, it should
+% contain the name of the file to process.
+% If he didn't, try the current file, unless that is |docstrip.tex|
+% in which case a default name is tried.
+% Whether or not the default batch file is used is
+% remembered by setting the switch |\ifDefault| to \meta{true} or
+% \meta{false}.
+% \begin{macrocode}
+\Defaultfalse
+% \end{macrocode}
+%
+% \begin{macrocode}
+\ifx\undefined\batchfile
+% \end{macrocode}
+% |\@jobname| is lowercase jobname (catcode 12)\\
+% |\@docstrip| is docstrip (catcode 12)
+% \begin{macrocode}
+ \ifx\@jobname\@docstrip
+% \end{macrocode}
+% Set the batchfile to the default
+% \begin{macrocode}
+ \let\batchfile\DefaultbatchFile
+ \Defaulttrue
+% \end{macrocode}
+% Else don't process a new batchfile, just carry on with past the end
+% of this file. In this case processing will move to the initial
+% batchfile which \emph{must} then be terminated by |\endbatchfile| or
+% \TeX\ will fall to the star prompt.
+% \begin{macrocode}
+ \else
+ \let\process@first@batchfile\relax
+ \fi
+\fi
+\process@first@batchfile
+% \end{macrocode}
+%
+% \begin{macrocode}
+%</program>
+% \end{macrocode}
+%
+% \Finale
+\endinput