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authorKarl Berry <karl@freefriends.org>2006-01-12 23:45:13 +0000
committerKarl Berry <karl@freefriends.org>2006-01-12 23:45:13 +0000
commit92a15e15b276458e10aa05016bf472e8c6dd3eb0 (patch)
treeaf0343097e5f497167cefa16ed45c03475b98c37 /Master/texmf-dist/tex/context/base/m-cweb.tex
parentdf014cf02a62504f6b3e7a4398fb1e093b84f114 (diff)
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+%D \module
+%D [ file=m-cweb,
+%D version=1997.01.15,
+%D title=\CONTEXT\ Extra Modules,
+%D subtitle=\CWEB\ Pretty Printing Macros,
+%D author=Hans Hagen,
+%D date=\currentdate,
+%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+%D First some auxiliary stuff, to be moved to system module.
+
+\def\dodofindfirstcharacter#1%
+ {\ifx#1\relax
+ \let\next=\egroup
+ \else
+ \handlecase
+ {\expandafter\ifnum\expandafter\catcode\expandafter`#1=11
+ \def\next##1\relax{\egroup\def\firstcharacter{#1}}%
+ \fi}%
+ \fi
+ \next}
+
+\def\dofindfirstcharacter#1#2%
+ {\def\firstcharacter{}%
+ \bgroup
+ \convertargument#2\to\ascii
+ \let\next=\dodofindfirstcharacter
+ \let\handlecase=#1
+ \expandafter\next\ascii\relax}
+
+\def\normalcase#1%
+ {#1}
+
+\def\findfirstcharacter%
+ {\dofindfirstcharacter\lowercase}
+
+\def\FindFirstCharacter%
+ {\dofindfirstcharacter\normalcase}
+
+\def\FINDFIRSTCHARACTER%
+ {\dofindfirstcharacter\uppercase}
+
+% nog doen:
+%
+% \deactivateCWEB in output routine
+% status info
+% gelinkte entries
+% parskip en parindent
+
+%D \gdef\CWEBquote#1.{{\em Quote :}\ #1.} % checks the .
+
+%D This module (re)implements the \CWEB\ macros as defined in
+%D the file \type{cwebmac.tex}.
+%D
+%D \CWEB\ uses short, often one character long, names for
+%D macros. This is no real problem because no one is supposed
+%D to read and understand the files generated by \CWEB. The
+%D standard macros are meant for \PLAIN\ \TEX\ users. In
+%D \CONTEXT\ and other macro packages however, there is a
+%D potential conflict with format specific or user defined
+%D commands. Furthermore, the \CWEB\ macros implement their own
+%D output routines. When integrating \CWEB\ documents in
+%D another environment, the \CWEB\ specific macros have to be
+%D made local. The first part of this module is dedicated to
+%D this feature.
+%D
+%D Instead of using \type{\def} and \type{\let} for defining
+%D macros, we use:
+%D
+%D \starttyping
+%D \defCEBmacro arguments {meaning}
+%D \letCEBmacro arguments {meaning}
+%D \stoptyping
+%D
+%D \CWEB files contain implicit calls to macros that generate
+%D the table of contents, the lists of sections and the index.
+%D Because we want to be much more flexible, we implemented our
+%D own alternatives, and therefore have to bypass the original
+%D ones. The next macro is used for defining these obsolete
+%D \CWEB\ macros. The dummies take care of arguments.
+%D
+%D \starttyping
+%D \defCEBdummy arguments {meaning}
+%D \stoptyping
+%D
+%D The list of \CWEB\ specific macro names is saved in a
+%D \TOKENLIST. This serves two purposes. First it enables us to
+%D activate the \CWEB\ macros, which are saved under a
+%D different name, second it can be used to temporary restore
+%D the meanings, for instance when the output routine builds
+%D the page.
+
+\newtoks\CWEBmacros
+
+%D Activating and deactivating is done by means of:
+%D
+%D \starttyping
+%D \activateCWEB
+%D \deactivateCWEB
+%D \stoptyping
+%D
+%D Which are implemented as:
+
+\def\activateCWEB%
+ {\let\doCWEB=\activateCWEBmacro
+ \the\CWEBmacros}
+
+\def\deactivateCWEB%
+ {\let\doCWEB=\deactivateCWEBmacro
+ \the\CWEBmacros}
+
+%D The three definition macros append the name of the macro to
+%D the list. The first two macros save the meaning, the last one
+%D assigns \type{{}} to the macro and gobbles original meaning.
+
+\long\def\defCWEBmacro#1%
+ {\appendtoks\doCWEB#1\to\CWEBmacros
+ \setvalue{newCWEB\string#1}}
+
+\long\def\letCWEBmacro#1%
+ {\appendtoks\doCWEB#1\to\CWEBmacros
+ \letvalue{newCWEB\string#1}}
+
+\long\def\defCWEBdummy#1#2#%
+ {\appendtoks\doCWEB#1\to\CWEBmacros
+ \setvalue{newCWEB\string#1}#2{}%
+ \gobbleoneargument}
+
+%D The macro \type{\defCWEBdummy} of course takes care of the
+%D argument. This leaves the two (de|)|activating macros:
+
+\def\CWEBmacro#1%
+ {\getvalue{newCWEB\string#1}}
+
+\def\activateCWEBmacro#1%
+ {\letvalue{oldCWEB\string#1}=#1%
+ \def#1{\CWEBmacro#1}}
+
+\def\deactivateCWEBmacro#1%
+ {\expandafter\let\expandafter#1\expandafter=\csname oldCWEB\string#1\endcsname}
+
+%D I did consider loading the \CWEB\ macros using temporary
+%D substitutes of \type{\def}, \type{\font}, \type{\newbox} etc.
+%D The main problem is that the file contains more than
+%D definitions and taking all kind of assignments into account
+%D too would not make things easier. So I decided to stick to
+%D the method as just described.
+
+%D Now we're ready for the real job. What follows is a partial
+%D adaption of the file \type{cwebmac.tex}, version 3.1, dated
+%D September 1994 and written by Levy and Knuth. When possible
+%D we kept the original meaning, but we've granted ourselves
+%D the freedom to reformat the macro's for readibility.
+%D
+%D We'll only present the macros we actually use. The source
+%D however contains the original implementation.
+
+% standard macros for CWEB listings (in addition to plain.tex)
+% Version 3.1 --- September 1994.
+%
+% \ifx\documentstyle\undefined\else\endinput\fi % LaTeX will use other macros
+%
+% \xdef\fmtversion{\fmtversion+CWEB3.1}
+
+%D \macros{.}{}
+%D
+%D \CWEBquote preserve a way to get the dot accent (all
+%D other accents will still work as usual).
+
+\letCWEBmacro\: = \.
+
+% \parskip = 0pt % no stretch between paragraphs
+% \parindent = 1em % for paragraphs and for the first line of C text
+
+% \font\ninerm = cmr9
+% \let\mc = \ninerm % medium caps
+% \font\eightrm = cmr8
+% \let\sc = \eightrm % small caps (NOT a caps-and-small-caps font)
+% \let\mainfont = \tenrm
+% \let\cmntfont = \tenrm
+% \font\tenss = cmss10
+% \let\cmntfont = \tenss % alternative comment font
+% \font\titlefont = cmr7 scaled \magstep4 % title on the contents page
+% \font\ttitlefont = cmtt10 scaled \magstep2 % typewriter type in title
+% \font\tentex = cmtex10 % TeX extended character set (used in strings)
+% \fontdimen7\tentex = 0pt % no double space after sentences
+
+%D \macros{mc,sc,cmntfont,eightrm}{}
+%D
+%D The naming of the fonts in in line with those in \PLAIN\
+%D \TEX. Although \CONTEXT\ implements its own scheme, there is
+%D still support for the \PLAIN\ ones. We keep the original
+%D names, but change their meaning. That way the macros obey
+%D switching to other sizes or styles.
+
+\defCWEBmacro\mc {\tx}
+\defCWEBmacro\sc {\txx}
+\defCWEBmacro\cmntfont {\ss}
+\defCWEBmacro\eightrm {\tx}
+
+%D \macros{tentex,sevenrm,sevensy,teni}{}
+%D
+%D The next one uses a temporary solution. The \type{cmtex10}
+%D font is not part of the default mechanism. We make use of
+%D the \CONTEXT\ variables \type{\textface}, \type{\scriptface}
+%D and \type{\scriptscriptface}, which hold the current
+%D sizes.
+
+\defCWEBmacro\tentex%
+ {\font\next=cmtex10 at \textface
+ \fontdimen7\next=0pt
+ \next}
+
+\defCWEBmacro\sevenrm {\getvalue{\scriptface rmtf}}
+\defCWEBmacro\sevensy {\getvalue{\scriptface mmsy}}
+\defCWEBmacro\teni {\getvalue{\textface mmmi}}
+
+%D \macros{CWEBpt}{}
+%D
+%D The original macros are based on a 10~point bodyfont size. We
+%D therefore have to specify dimension in points a bit
+%D different. Specifications like .6pt are changed to
+%D \type{.06} times \type{\korpsgrootte}.
+
+\defCWEBmacro\CWEBpt {\korpsgrootte} % still dutch
+
+%D \macros{CEE,UNIX,TEX,CPLUSPLUS}{}
+%D
+%D Next come some logo's. It does not make much sense to use
+%D the \CONTEXT\ logo mechanism here, so we simply say:
+
+\defCWEBmacro \CEE/{{\mc C\spacefactor1000}}
+\defCWEBmacro \UNIX/{{\mc U\kern-.05emNIX\spacefactor1000}}
+\defCWEBmacro \TEX/{\TeX}
+\defCWEBmacro\CPLUSPLUS/{{\mc C\PP\spacefactor1000}}
+\defCWEBmacro \Cee{\CEE/} % for backward compatibility
+
+%D \macros{\ }{}
+%D
+%D Now we come to the real work: the short commands that make
+%D up the typography.
+%D
+%D \CWEBquote italic type for identifiers.
+
+\defCWEBmacro\\#1%
+ {\leavevmode\hbox{\it#1\/\kern.05em}}
+
+%D \macros{\string|}{}
+%D
+%D \CWEBquote one letter identifiers look better this way.
+
+\defCWEBmacro\|#1%
+ {\leavevmode\hbox{$#1$}}
+
+%D \macros{\string&}{}
+%D
+%D \CWEBquote boldface type for reserved words.
+
+\defCWEBmacro\&#1%
+ {\leavevmode
+ \hbox
+ {\def\_%
+ {\kern.04em
+ \vbox{\hrule width.3em height .06\CWEBpt}% .6pt}%
+ \kern.08em}%
+ \bf#1\/\kern.05em}}
+
+%D \macros{.}{}
+%D
+%D Here we use the previously saved period. This macro
+%D takes care of special characters in strings.
+
+\defCWEBmacro\.#1%
+ {\leavevmode
+ \hbox
+ {\tentex % typewriter type for strings
+ \let\\=\BS % backslash in a string
+ \let\{=\LB % left brace in a string
+ \let\}=\RB % right brace in a string
+ \let\~=\TL % tilde in a string
+ \let\ =\SP % space in a string
+ \let\_=\UL % underline in a string
+ \let\&=\AM % ampersand in a string
+ \let\^=\CF % circumflex in a string
+ #1\kern.05em}}
+
+%D \macros{)}{}
+%D
+%D Some discretionary hack.
+
+\defCWEBmacro\)%
+ {\discretionary{\hbox{\tentex\BS}}{}{}}
+
+%D \macros{AT}{}
+%D
+%D \CWEBquote at sign for control text (not needed in versions
+%D $>=$ 2.9).
+
+\defCWEBmacro\AT{@}
+
+%D \macros{ATL,postATL,NOATL}{}
+%D
+%D A two step macro that handles whatever.
+
+\defCWEBmacro\ATL%
+ {\par
+ \noindent
+ \bgroup
+ \catcode`\_=12
+ \postATL}
+
+\defCWEBmacro\postATL#1 #2 %
+ {\bf letter \\{\uppercase{\char"#1}} tangles as \tentex "#2"%
+ \egroup
+ \par}
+
+\defCWEBmacro\noATL#1 #2 %
+ {}
+
+%D \macros{noatl}{}
+%D
+%D \CWEBquote suppress output from \type{@l}.
+
+\defCWEBmacro\noatl%
+ {\let\ATL=\noATL}
+
+% \defCWEBmacro\ATH%
+% {\X\kern-.5em:Preprocessor definitions\X}
+
+%D \macros{PB}
+%D
+%D \CWEBquote hook for program brackets {\tttf\string|...\string|}
+%D in TeX part or section name.
+
+\defCWEBmacro\PB%
+ {\relax}
+
+% \chardef\AM = `\& % ampersand character in a string
+% \chardef\BS = `\\ % backslash in a string
+% \chardef\LB = `\{ % left brace in a string
+% \chardef\RB = `\} % right brace in a string
+% \chardef\TL = `\~ % tilde in a string
+% \chardef\UL = `\_ % underline character in a string
+% \chardef\CF = `\^ % circumflex character in a string
+
+\defCWEBmacro\AM {\char`\&} % ampersand character in a string
+\defCWEBmacro\BS {\char`\\} % backslash in a string
+\defCWEBmacro\LB {\char`\{} % left brace in a string
+\defCWEBmacro\RB {\char`\}} % right brace in a string
+\defCWEBmacro\TL {\char`\~} % tilde in a string
+\defCWEBmacro\UL {\char`\_} % underline character in a string
+\defCWEBmacro\CF {\char`\^} % circumflex character in a string
+
+\defCWEBmacro\SP {{\tt\char`\ }} % (visible) space in a string
+
+% \newbox\PPbox \setbox\PPbox=\hbox
+% {\kern.5pt\raise1pt\hbox{\sevenrm+\kern-1pt+}\kern.5pt}
+% \newbox\MMbox \setbox\MMbox=\hbox
+% {\kern.5pt\raise1pt\hbox{\sevensy\char0\kern-1pt\char0}\kern.5pt}
+% \newbox\MGbox \setbox\MGbox=\hbox % symbol for ->
+% {\kern-2pt\lower3pt\hbox{\teni\char'176}\kern1pt}
+% \newbox\MODbox \setbox\MODbox=\hbox
+% {\eightrm\%}
+%
+% \def\PP {\copy\PPbox}
+% \def\MM {\copy\MMbox}
+% \def\MG {\copy\MGbox}
+% \def\MOD {\mathbin{\copy\MODbox}}
+
+\defCWEBmacro\PP% symbol for ++
+ {\kern.05\CWEBpt
+ \raise.1\CWEBpt\hbox{\sevenrm+\kern-.1\CWEBpt+}%
+ \kern.05\CWEBpt}
+
+\defCWEBmacro\MM%
+ {\kern.05\CWEBpt
+ \raise.1\CWEBpt\hbox{\sevensy\char0\kern-.1\CWEBpt\char0}%
+ \kern.05\CWEBpt}
+
+\defCWEBmacro\MG%
+ {\kern-.2\CWEBpt
+ \lower.3\CWEBpt\hbox{\teni\char'176}%
+ \kern .1\CWEBpt}
+
+\defCWEBmacro\MRL#1%
+ {\mathrel{\let\K==#1}}
+
+% \def\MRL#1%
+% {\KK#1}
+% \def\KK#1#2%
+% {\buildrel\;#1\over{#2}}
+
+\letCWEBmacro\GG = \gg
+\letCWEBmacro\LL = \ll
+\letCWEBmacro\NULL = \Lambda
+
+% \mathchardef\AND = "2026 % bitwise and; also \& (unary operator)
+
+\defCWEBmacro\AND% redefines itself (funny)
+ {\mathchardef\AND="2026 \AND} % bitwise and; also \& (unary operator)
+
+\letCWEBmacro\OR = \mid % bitwise or
+\letCWEBmacro\XOR = \oplus % bitwise exclusive or
+\defCWEBmacro\CM {{\sim}} % bitwise complement
+\defCWEBmacro\MOD {\mathbin{\eightrm\%}}
+\defCWEBmacro\DC {\kern.1em{::}\kern.1em} % symbol for ::
+\defCWEBmacro\PA {\mathbin{.*}} % symbol for .*
+\defCWEBmacro\MGA {\mathbin{\MG*}} % symbol for ->*
+\defCWEBmacro\this {\&{this}}
+
+% \newbox \bak % backspace one em
+% \newbox \bakk % backspace two ems
+%
+% \setbox\bak =\hbox to -1em{}
+% \setbox\bakk=\hbox to -2em{}
+
+\newcount\CWEBind % current indentation in ems
+
+\defCWEBmacro\1% indent one more notch
+ {\global\advance\CWEBind by 1
+ \hangindent\CWEBind em}
+
+\defCWEBmacro\2% indent one less notch
+ {\global\advance\CWEBind by -1 }
+
+\defCWEBmacro\3#1% optional break within a statement
+ {\hfil
+ \penalty#10
+ \hfilneg}
+
+\defCWEBmacro\4% backspace one notch
+ {\hbox to -1em{}}
+
+\defCWEBmacro\5% optional break
+ {\hfil
+ \penalty-1
+ \hfilneg
+ \kern2.5em
+ \hbox to -2em{}%
+ \ignorespaces}
+
+\defCWEBmacro\6% forced break
+ {\ifmmode
+ \else
+ \par
+ \hangindent\CWEBind em
+ \noindent
+ \kern\CWEBind em
+ \hbox to -2em{}%
+ \ignorespaces
+ \fi}
+
+\defCWEBmacro\7% forced break and a little extra space
+ {\Y
+ \6}
+
+\defCWEBmacro\8% no indentation
+ {\hskip-\CWEBind em
+ \hskip 2em}
+
+\defCWEBmacro\9#1%
+ {}
+
+\newcount\gdepth % depth of current major group, plus one
+\newcount\secpagedepth
+\secpagedepth=3 % page breaks will occur for depths -1, 0, and 1
+
+% \newtoks\gtitle % title of current major group
+% \newskip\intersecskip
+% \intersecskip=12pt minus 3pt % space between sections
+
+% \let\yskip=\smallskip
+
+\defCWEBmacro\?%
+ {\mathrel?}
+
+% \def\note#1#2.%
+% {\Y\noindent
+% {\hangindent2em\baselineskip10pt\eightrm#1~#2.\par}}
+
+\defCWEBmacro\lapstar%
+ {\rlap{*}}
+
+% \def\stsec%
+% {\rightskip=0pt % get out of C mode (cf. \B)
+% \sfcode`;=1500
+% \pretolerance 200
+% \hyphenpenalty 50
+% \exhyphenpenalty 50
+% \noindent{\let\*=\lapstar\bf\secstar.\quad}}
+%
+% \let\startsection=\stsec
+
+\defCWEBmacro\defin#1%
+ {\global\advance\CWEBind by 2 \1\&{#1 } } % begin `define' or `format'
+
+% \def\A% xref for doubly defined section name
+% {\note{See also section}}
+%
+% \def\As% xref for multiply defined section name
+% {\note{See also sections}}
+
+\defCWEBmacro\B%
+ {\rightskip=0pt plus 100pt minus 10pt % go into C mode
+ \sfcode`;=3000
+ \pretolerance 10000
+ \hyphenpenalty 1000 % so strings can be broken (discretionary \ is inserted)
+ \exhyphenpenalty 10000
+ \global\CWEBind=2 \1\ \unskip}
+
+\defCWEBmacro\C#1%
+ {\5\5\quad$/\ast\,${\cmntfont #1}$\,\ast/$}
+
+% \let\SHC\C % "// short comments" treated like "/* ordinary comments */"
+
+\defCWEBmacro\SHC#1%
+ {\5\5\quad$//\,${\cmntfont#1}}
+
+% \def\C#1{\5\5\quad$\triangleright\,${\cmntfont#1}$\,\triangleleft$}
+% \def\SHC#1{\5\5\quad$\diamond\,${\cmntfont#1}}
+
+\defCWEBmacro\D% macro definition
+ {\defin{\#define}}
+
+\letCWEBmacro\E=\equiv % equivalence sign
+
+% \def\ET% conjunction between two section numbers
+% { and~}
+%
+% \def\ETs% conjunction between the last two of several section numbers
+% {, and~}
+
+\defCWEBmacro\F% format definition
+ {\defin{format}}
+
+\letCWEBmacro\G = \ge % greater than or equal sign
+
+% \H is long Hungarian umlaut accent
+
+\letCWEBmacro\I = \ne % unequal sign
+
+\defCWEBmacro\J% TANGLE's join operation
+ {\.{@\&}}
+
+% \let\K== % assignment operator
+
+\letCWEBmacro\K = \leftarrow % "honest" alternative to standard assignment operator
+
+% \L is Polish letter suppressed-L
+
+% \outer\def\M#1%
+% {\MN{#1}%
+% \ifon
+% \vfil
+% \penalty-100
+% \vfilneg % beginning of section
+% \vskip\intersecskip
+% \startsection
+% \ignorespaces}
+%
+% \outer\def\N#1#2#3.%
+% {\gdepth=#1%
+% \gtitle={#3}%
+% \MN{#2}% beginning of starred section
+% \ifon
+% \ifnum#1<\secpagedepth
+% \vfil
+% \eject % force page break if depth is small
+% \else
+% \vfil
+% \penalty-100
+% \vfilneg
+% \vskip\intersecskip
+% \fi
+% \fi
+% \message{*\secno}% progress report
+% \edef\next%
+% {\write\cont % write to contents file
+% {\ZZ{#3}{#1}{\secno}{\noexpand\the\pageno}}}%
+% \next % \ZZ{title}{depth}{sec}{page}
+% \ifon
+% \startsection
+% {\bf#3.\quad}%
+% \ignorespaces}
+%
+% \def\MN#1%
+% {\par % common code for \M, \N
+% {\xdef\secstar{#1}%
+% \let\*=\empty
+% \xdef\secno{#1}}% remove \* from section name
+% \ifx\secno\secstar
+% \onmaybe
+% \else
+% \ontrue
+% \fi
+% \mark{{{\tensy x}\secno}{\the\gdepth}{\the\gtitle}}}
+%
+% each \mark is {section reference or null}{depth plus 1}{group title}
+
+% \O is Scandinavian letter O-with-slash
+% \P is paragraph sign
+
+\defCWEBmacro\Q {\note{This code is cited in section}} % xref for mention of a section
+\defCWEBmacro\Qs {\note{This code is cited in sections}} % xref for mentions of a section
+
+% \S is section sign
+
+\defCWEBmacro\T#1%
+ {\leavevmode % octal, hex or decimal constant
+ \hbox
+ {$\def\?{\kern.2em}%
+ \def\$##1{\egroup_{\,\rm##1}\bgroup}% suffix to constant
+ \def\_{\cdot 10^{\aftergroup}}% power of ten (via dirty trick)
+ \let\~=\oct
+ \let\^=\hex
+ {#1}$}}
+
+\defCWEBmacro\U {\note{This code is used in section}} % xref for use of a section
+\defCWEBmacro\Us {\note{This code is used in sections}} % xref for uses of a section
+
+\letCWEBmacro\R = \lnot % logical not
+\letCWEBmacro\V = \lor % logical or
+\letCWEBmacro\W = \land % logical and
+
+% defined later on
+%
+% \def\X#1:#2\X%
+% {\ifmmode
+% \gdef\XX{\null$\null}%
+% \else
+% \gdef\XX{}%
+% \fi % section name
+% \XX$\langle\,${#2\eightrm\kern.5em#1}$\,\rangle$\XX}
+
+\unprotect
+
+\def\theCWEByskip {\blank[\v!small]}
+\def\theCWEBvskip {\blank[\v!big]}
+
+\protect
+
+\defCWEBmacro\Y%
+ {\par
+ \yskip}
+
+\defCWEBmacro\yskip%
+ {\theCWEByskip}
+
+\letCWEBmacro\Z = \le
+% \letCWEBmacro\ZZ = \let % now you can \write the control sequence \ZZ
+\letCWEBmacro\* = *
+
+\defCWEBmacro\oct%
+ {\hbox{$^\circ$\kern-.1em\it\aftergroup\?\aftergroup}}
+
+\defCWEBmacro\hex%
+ {\hbox{$^{\scriptscriptstyle\#}$\tt\aftergroup}}
+
+\defCWEBmacro\vb#1%
+ {\leavevmode
+ \hbox
+ {\kern.2\CWEBpt
+ \vrule
+ \vtop
+ {\vbox
+ {\hrule
+ \hbox{\strut\kern.2\CWEBpt\.{#1}\kern.2\CWEBpt}}
+ \hrule}%
+ \vrule
+ \kern.2\CWEBpt}} % verbatim string
+
+\def\onmaybe%
+ {\let\ifon=\maybe}
+
+\let\maybe=\iftrue
+
+\newif\ifon
+
+% \newif\iftitle
+% \newif\ifpagesaved
+%
+% \def\lheader%
+% {\mainfont
+% \the\pageno
+% \eightrm
+% \qquad
+% \grouptitle
+% \hfill
+% \title
+% \qquad
+% \mainfont
+% \topsecno} % top line on left-hand pages
+%
+% \def\rheader%
+% {\mainfont
+% \topsecno
+% \eightrm
+% \qquad
+% \title
+% \hfill
+% \grouptitle
+% \qquad
+% \mainfont
+% \the\pageno} % top line on right-hand pages
+%
+% \def\grouptitle
+% {\let\i=I
+% \let\j=J
+% \uppercase\expandafter{\expandafter\takethree\topmark}}
+%
+% \def\topsecno%
+% {\expandafter\takeone\topmark}
+%
+% \def\takeone #1#2#3{#1}
+% \def\taketwo #1#2#3{#2}
+% \def\takethree #1#2#3{#3}
+%
+% \def\nullsec%
+% {\eightrm
+% \kern-2em} % the \kern-2em cancels \qquad in headers
+%
+% \let\page=\pagebody % \def\page {\box255 }
+% \raggedbottom % \normalbottom % faster, but loses plain TeX footnotes
+%
+% \def\normaloutput#1#2#3%
+% {\shipout\vbox
+% {\ifodd
+% \pageno
+% \hoffset=\pageshift
+% \fi
+% \vbox to \fullpageheight
+% {\iftitle
+% \global\titlefalse
+% \else
+% \hbox to \pagewidth
+% {\vbox to 10pt{}%
+% \ifodd\pageno #3\else#2\fi}
+% \fi
+% \vfill#1}} % parameter #1 is the page itself
+% \global\advance\pageno by 1}
+%
+% \gtitle={\.{CWEB} output} % this running head is reset by starred sections
+%
+% \mark{\noexpand\nullsec0{\the\gtitle}}
+%
+% \def\title%
+% {\expandafter\uppercase\expandafter{\jobname}}
+%
+% \def\topofcontents%
+% {\centerline{\titlefont\title}
+% \vskip.7in
+% \vfill} % this material will start the table of contents page
+
+\def\botofcontents%
+ {\vfill
+ \centerline{\covernote}} % this material will end the table of contents page
+
+\def\covernote%
+ {}
+
+% some leftover
+
+\defCWEBmacro\contentspagenumber{0} % default page number for table of contents
+
+% \newdimen\pagewidth \pagewidth = 158mm % the width of each page
+% \newdimen\pageheight \pageheight = 223mm % the height of each page
+% \newdimen\fullpageheight \fullpageheight = 240mm % page height including headlines
+% \newdimen\pageshift \pageshift = 0in % shift righthand pages wrt lefthand ones
+%
+% \def\magnify#1%
+% {\mag=#1
+% \pagewidth=6.5truein
+% \pageheight=8.7truein
+% \fullpageheight=9truein
+% \setpage}
+%
+% \def\setpage%
+% {\hsize\pagewidth
+% \vsize\pageheight} % use after changing page size
+%
+% \def\contentsfile {\jobname.toc} % file that gets table of contents info
+% \def\readcontents {\input \contentsfile}
+% \def\readindex {\input \jobname.idx}
+% \def\readsections {\input \jobname.scn}
+%
+% \newwrite\cont
+% \output{\setbox0=\page % the first page is garbage
+% \openout\cont=\contentsfile
+% \write\cont{\catcode `\noexpand\@=11\relax} % \makeatletter
+% \global\output{\normaloutput\page\lheader\rheader}}
+% \setpage
+% \vbox to \vsize{} % the first \topmark won't be null
+
+\defCWEBdummy\magnify#1% magnify the page
+ {}
+
+\defCWEBmacro\ch%
+ {\note{The following sections were changed by the change file:}
+ \let\*=\relax}
+
+% \newbox\sbox % saved box preceding the index
+% \newbox\lbox % lefthand column in the index
+%
+% \def\inx%
+% {\par\vskip6pt plus 1fil % we are beginning the index
+% \def\page{\box255 }
+% \normalbottom
+% \write\cont{} % ensure that the contents file isn't empty
+% \write\cont{\catcode `\noexpand\@=12\relax} % \makeatother
+% \closeout\cont % the contents information has been fully gathered
+% \output
+% {\ifpagesaved
+% \normaloutput{\box\sbox}\lheader\rheader
+% \fi
+% \global\setbox\sbox=\page
+% \global\pagesavedtrue}
+% \pagesavedfalse
+% \eject % eject the page-so-far and predecessors
+% \setbox\sbox\vbox{\unvbox\sbox} % take it out of its box
+% \vsize=\pageheight
+% \advance\vsize by -\ht\sbox % the remaining height
+% \hsize=.5\pagewidth
+% \advance\hsize by -10pt
+% % column width for the index (20pt between cols)
+% \parfillskip 0pt plus .6\hsize % try to avoid almost empty lines
+% \def\lr{L} % this tells whether the left or right column is next
+% \output
+% {\if L\lr
+% \global\setbox\lbox=\page
+% \gdef\lr{R}
+% \else
+% \normaloutput
+% {\vbox to\pageheight
+% {\box\sbox
+% \vss
+% \hbox to\pagewidth{\box\lbox\hfil\page}}}
+% \lheader
+% \rheader
+% \global\vsize\pageheight\gdef\lr{L}\global\pagesavedfalse\fi}
+% \message{Index:}
+% \parskip 0pt plus .5pt
+% \outer\def\I##1, {\par\hangindent2em\noindent##1:\kern1em} % index entry
+% \def\[##1]{$\underline{##1}$} % underlined index item
+% \rm
+% \rightskip0pt plus 2.5em
+% \tolerance 10000
+% \let\*=\lapstar
+% \hyphenpenalty 10000
+% \parindent0pt
+% \readindex}
+%
+% \def\fin%
+% {\par\vfill\eject % this is done when we are ending the index
+% \ifpagesaved\null\vfill\eject\fi % output a null index column
+% \if L\lr\else\null\vfill\eject\fi % finish the current page
+% \parfillskip 0pt plus 1fil
+% \def\grouptitle{NAMES OF THE SECTIONS}
+% \let\topsecno=\nullsec
+% \message{Section names:}
+% \output={\normaloutput\page\lheader\rheader}
+% \setpage
+% \def\note##1##2.{\quad{\eightrm##1~##2.}}
+% \def\Q{\note{Cited in section}} % crossref for mention of a section
+% \def\Qs{\note{Cited in sections}} % crossref for mentions of a section
+% \def\U{\note{Used in section}} % crossref for use of a section
+% \def\Us{\note{Used in sections}} % crossref for uses of a section
+% \def\I{\par\hangindent 2em}\let\*=*
+% \readsections}
+%
+% \def\con%
+% {\par\vfill\eject % finish the section names
+% %\ifodd\pageno\else\titletrue\null\vfill\eject\fi % for duplex printers
+% \rightskip = 0pt
+% \hyphenpenalty = 50
+% \tolerance = 200
+% \setpage
+% \output={\normaloutput\page\lheader\rheader}
+% \titletrue % prepare to output the table of contents
+% \pageno=\contentspagenumber
+% \def\grouptitle{TABLE OF CONTENTS}
+% \message{Table of contents:}
+% \topofcontents
+% \line{\hfil Section\hbox to3em{\hss Page}}
+% \let\ZZ=\contentsline
+% \readcontents\relax % read the contents info
+% \botofcontents
+% \end} % print the contents page(s) and terminate
+%
+% \def\contentsline#1#2#3#4%
+% {\ifnum#2=0
+% \smallbreak
+% \fi
+% \line{\consetup{#2}#1
+% \rm\leaders\hbox to .5em{.\hfil}\hfil\ #3\hbox to3em{\hss#4}}}
+%
+
+\defCWEBmacro\consetup#1%
+ {\ifcase#1 \bf % depth -1 (@**)
+ \or % depth 0 (@*)
+ \or \hskip2em % depth 1 (@*1)
+ \or \hskip4em % depth 2 (@*2)
+ \or \hskip6em % depth 3 (@*3)
+ \or \hskip8em % depth 4 (@*4)
+ \or \hskip10em % depth 5 (@*5)
+ \else \hskip12em
+ \fi} % depth 6 or more
+
+\defCWEBdummy \inx {} % index
+\defCWEBdummy \fin {} % finish
+\defCWEBdummy \con {} % table of contents and finish
+
+\defCWEBdummy \noinx {} % no indexes or table of contents
+\defCWEBdummy \nosecs {} % no index of section names or table of contents
+\defCWEBdummy \nocon {} % no table of contents
+
+\defCWEBmacro\,%
+ {\relax
+ \ifmmode
+ \mskip\thinmuskip
+ \else
+ \thinspace
+ \fi}
+
+% \def\noinx%
+% {\let\inx=\end}
+%
+% \def\nosecs%
+% {\let\FIN=\fin
+% \def\fin%
+% {\let\parfillskip=\end
+% \FIN}}
+%
+% \def\nocon%
+% {\let\con=\end}
+%
+% \newcount\twodigits
+%
+% \def\hours%
+% {\twodigits=\time
+% \divide\twodigits by 60
+% \printtwodigits
+% \multiply\twodigits by -60
+% \advance\twodigits by \time
+% :\printtwodigits}
+%
+% \def\gobbleone1{}
+%
+% \def\printtwodigits%
+% {\advance\twodigits by 100
+% \expandafter\gobbleone\number\twodigits
+% \advance\twodigits by -100 }
+%
+% \def\today%
+% {\ifcase\month
+% \or January\or February\or March\or April\or May\or June%
+% \or July\or August\or September\or October\or November\or December%
+% \fi
+% \space
+% \number\day, \number\year}
+%
+% \def\datethis%
+% {\def\startsection%
+% {\leftline{\sc\today\ at \hours}
+% \bigskip
+% \let\startsection=\stsec
+% \stsec}}
+%
+% \def\datecontentspage%
+% {\def\topofcontents%
+% {\leftline{\sc\today\ at \hours}
+% \bigskip
+% \centerline{\titlefont\title}
+% \vfill}}
+
+\defCWEBdummy\datethis {} % say `\datethis' in limbo, to get your listing timestamped before section 1
+\defCWEBdummy\datecontentspage {} % timestamps the contents page
+
+\defCWEBmacro\TeX%
+ {{\ifmmode\it\fi
+ \leavevmode
+ \hbox{T\kern-.1667em\lower.424ex\hbox{E}\hskip-.125em X}}}
+
+% alternative implementation
+
+\newif\ifCWEBnotes
+
+\defCWEBmacro\Q {\CWEBnotesfalse \note{This code is cited in section}} % xref for mention of a section
+\defCWEBmacro\Qs {\CWEBnotestrue \note{This code is cited in sections}} % xref for mentions of a section
+
+\defCWEBmacro\U {\CWEBnotesfalse \note{This code is used in section}} % xref for use of a section
+\defCWEBmacro\Us {\CWEBnotestrue \note{This code is used in sections}} % xref for uses of a section
+
+\defCWEBmacro\A {\CWEBnotesfalse \note{See also section}} % xref for doubly defined section name
+\defCWEBmacro\As {\CWEBnotestrue \note{See also sections}} % xref for multiply defined section name
+
+\defCWEBmacro\ET% conjunction between two section numbers
+ { and~}
+
+\defCWEBmacro\ETs% conjunction between the last two of several section numbers
+ {, and~}
+
+%\def\processCWEBsectionnumbers[#1]%
+% {\bgroup
+% \def\CWEBcomma%
+% {\def\CWEBcomma{, }}%
+% \def\docommando##1%
+% {\bgroup
+% \def\[####1]{####1}%
+% \xdef\CWEBreference{##1}%
+% \egroup
+% \CWEBcomma{\naar{\donottest{##1}}[web:\CWEBreference]}}%
+% \processcommalist[{#1}]\docommando
+% \egroup}
+
+% \def\processCWEBsectionnumbers[#1]%
+% {\bgroup
+% \def\CWEBcomma%
+% {\def\CWEBcomma{, }}%
+% \def\docommando##1%
+% {\bgroup
+% \def\(####1){####1}%
+% \xdef\CWEBreference{##1}%
+% \egroup
+% \CWEBcomma
+% {\localcolortrue\naar{\donottest{##1}}[web:\CWEBreference]}}%
+% \bgroup
+% \def\[##1]{\(##1)}\let\(=\relax\xdef\CWEBreferences{#1}%
+% \egroup
+% \unexpanded\def\(##1){\[##1]}%
+% \processcommacommand[\CWEBreferences]\docommando
+% \egroup}
+
+\def\processCWEBsectionnumbers[#1]%
+ {\bgroup
+ \def\CWEBcomma%
+ {\def\CWEBcomma{, }}%
+ \def\docommando##1%
+ {\bgroup
+ \def\[####1]{####1}%
+ \xdef\CWEBreference{##1}%
+ \egroup
+ \CWEBcomma{\localcolortrue\goto{\donottest{##1}}[web:\CWEBreference]}}%
+ \processlist{(}{)}{,}\docommando(#1)
+ \egroup}
+
+\def\processCWEBsectionnotes%
+ {\catcode`\s=12
+ \doprocessCWEBsectionnotes}
+
+\def\doprocessCWEBsectionnotes#1.%
+ {\ifCWEBnotes
+ \def\next##1\ET##2##3.%
+ {\processCWEBsectionnumbers[##1]%
+ \if##2s%
+ {, and~\goto{##3}[web:##3]}%
+ \else
+ { and~\goto{##2##3}[web:##2##3]}%
+ \fi}%
+ \next#1.%
+ \else
+ \goto{#1}[web:#1]%
+ \fi
+ \afterCWEBnote % inside group!
+ \egroup}
+
+\let\afterCWEBnote=\relax
+
+\defCWEBmacro\note#1%
+ {\bgroup
+ \Y\noindent
+ \def\afterCWEBnote{\par}%
+ \hangindent2em
+ %\baselineskip10pt
+ \eightrm#1~\processCWEBsectionnotes}
+
+\def\oldCWEBmacroX#1:#2\X% original
+ {\ifmmode
+ \gdef\XX{\null$\null}%
+ \else
+ \gdef\XX{}%
+ \fi % section name
+ \XX$\langle\,${#2\eightrm\kern.5em#1}$\,\rangle$\XX}
+
+\defCWEBmacro\ATH%
+ {\oldCWEBmacroX\kern-.5em:Preprocessor definitions\X}
+
+\def\newCWEBmacroX#1:#2\X% original
+ {\ifmmode
+ \gdef\XX{\null$\null}%
+ \else
+ \gdef\XX{}%
+ \fi % section name
+ \XX$\langle\,$%
+ {#2\eightrm\kern.5em\processCWEBsectionnumbers[{#1}]}%
+ $\,\rangle$\XX}
+
+\defCWEBmacro\X#1:#2\X%
+ {\newCWEBmacroX#1:#2\X}
+
+\definemarking[CWEBfilename]
+\definemarking[CWEBsectiontitle]
+\definemarking[CWEBsectionnumber]
+\definemarking[CWEBsectiondepth]
+
+\defCWEBmacro\M#1%
+ {\MN{#1}%
+ \ifon
+ \vfil
+ \penalty-100
+ \vfilneg % beginning of section
+ \theCWEBvskip
+ \startsection
+ \pagereference[web:#1]%
+ \expanded{\marking[CWEBsectionnumber]{\secno}}%
+ \expanded{\marking[CWEBsectiondepth]{\the\gdepth}}%
+ \ignorespaces}
+
+\defCWEBmacro\N#1#2#3.%
+ {\gdepth=#1%
+ \MN{#2}% beginning of starred section
+ \ifon
+ \ifnum#1<\secpagedepth
+ \vfil
+ \eject % force page break if depth is small
+ \else
+ \vfil
+ \penalty-100
+ \vfilneg
+ \theCWEBvskip
+ \fi
+ \fi
+ \message{*\secno}% progress report
+ \makesectionformat % context
+ \convertargument#3\to\ascii
+ \edef\next%
+ {\write\CWEBcont % write to contents file
+ {\string\ZZ{\ascii}{#1}{\secno}%
+ {\sectionformat::\noexpand\userfolio}{\noexpand\realfolio}}}%
+ \next % \ZZ{title}{depth}{sec}{page}
+ \ifon
+ \startsection
+ \pagereference[web:#2]%
+ \marking[CWEBsectiontitle] {#3}%
+ \expanded{\marking[CWEBsectionnumber]{\secno}}%
+ \expanded{\marking[CWEBsectiondepth]{\the\gdepth}}%
+ {\bf#3.\quad}%
+ \ignorespaces}
+
+\defCWEBmacro\MN#1%
+ {\par % common code for \M, \N
+ {\xdef\secstar{#1}%
+ \let\*=\empty
+ \xdef\secno{#1}}% remove \* from section name
+ \ifx\secno\secstar
+ \onmaybe
+ \else
+ \ontrue
+ \fi}
+
+\newif\iflinktoCWEBfile
+
+\def\setCWEBlinkfile#1%
+ {\linktoCWEBfiletrue
+ \def\otherCWEBfile{#1}}
+
+\unprotect
+
+\def\gotoCWEBsection#1[#2]%
+ {\iflinktoCWEBfile
+ \bgroup
+ \setupinteraction[\c!color=,\c!style=]%
+ \let\savedreferenceprefix=\referenceprefix
+ \localcolortrue
+ \goto{#1}[\otherCWEBfile::\savedreferenceprefix web:#2]%
+ \egroup
+ \else
+ #1%
+ \fi}
+
+\protect
+
+\defCWEBmacro\startsection%
+ {\rightskip=0pt % get out of C mode (cf. \B)
+ \sfcode`;=1500
+ \pretolerance 200
+ \hyphenpenalty 50
+ \exhyphenpenalty 50
+ \noindent
+ \bgroup
+ \let\*=\lapstar
+ \gotoCWEBsection{\bf\secstar.\quad}[\secno]%
+ \egroup}
+
+\def\ignoreCWEBinput%
+ {\let\normalinput=\input
+ \def\input ##1 %
+ {\let\input=\normalinput}}
+
+\def\loadCWEBmacros#1%
+ {\let\oldN=\N
+ \def\N{\bgroup\setbox0=\vbox\bgroup\endinput}%
+ \ignoreCWEBinput
+ \ReadFile{#1.tex}%
+ \egroup\egroup
+ \let\N=\oldN}
+
+\def\resetCWEBcontext%
+ {\catcode`\|=12 % used in context discretionaries
+ \everypar{} % used for context indentation and floats
+ \parskip=0pt % no stretch between cweb paragraphs
+ \parindent=1em} % is related to cweb backspace etc
+
+\newwrite\CWEBcont
+
+\def\processCWEBsource #1 %
+ {\bgroup
+ \resetCWEBcontext
+ \activateCWEB
+ \ignoreCWEBinput
+ \immediate\openout\CWEBcont=#1.toc
+ \write\CWEBcont{\noexpand\unprotect}
+ \message{Source:}
+ \marking[CWEBfilename]{#1}
+ \ReadFile{#1.tex}\relax
+ \write\CWEBcont{\noexpand\protect}
+ \closeout\CWEBcont
+ \par
+ \egroup}
+
+\def\resetCWEBindexentry%
+ {\xdef\currentCWEBindexentry{}}
+
+\def\showCWEBindexentry#1% can be redefined
+ {\theCWEBvskip
+ \vskip3\lineheight
+ \goodbreak
+ \vskip-3\lineheight
+ {\pagereference[web:#1]\bf#1}%
+ \theCWEBvskip}
+
+\def\checkCWEBindexentry#1%
+ {\bgroup
+ \def\\##1{##1}% a dummy that also removes the {}
+ \def\|##1{##1}% another dummy
+ \def\.##1{*##1}% and another (the typewriter one)
+ \def\&##1{##1}% and a last one
+ \def\9##1{##1}% hold this one
+ \catcode`*=11
+ \expandafter\def\expandafter\entry\expandafter{#1}%
+ \convertcommand\entry\to\ascii
+ \expanded{\FINDFIRSTCHARACTER{\ascii}}%
+ \doifnot{\currentCWEBindexentry}{\firstcharacter}
+ {\doifnot{\firstcharacter}{*} % signal for \firstbunch
+ {\global\let\currentCWEBindexentry=\firstcharacter
+ \showCWEBindexentry{\currentCWEBindexentry}}}%
+ \egroup}
+
+\def\theCWEBbeforeindex {\startcolumns}
+\def\theCWEBafterindex {\stopcolumns}
+
+\def\processCWEBindex #1 %
+ {\bgroup
+ \resetCWEBcontext
+ \activateCWEB
+ \resetCWEBindexentry
+ \def\I##1, %
+ {\par
+ \checkCWEBindexentry{##1}%
+ \hangindent2em
+ \noindent##1:\kern1em%
+ \def\next####1.%
+ {\processCWEBsectionnumbers[{####1}]}%
+ \next}%
+ \def\[##1]%
+ {$\underline{##1}$}%
+ \let\*=\lapstar
+ \parfillskip 0pt plus .6\hsize % try to avoid almost empty lines
+% \parskip 0pt plus .5pt
+ \rightskip0pt plus 2.5em
+ \tolerance 10000
+ \hyphenpenalty 10000
+ \parindent0pt
+ \message{Index:}
+ \marking[CWEBfilename] {#1}
+ \marking[CWEBsectiontitle] {index}
+ \marking[CWEBsectionnumber]{}
+ \marking[CWEBsectiondepth]{}
+ \loadCWEBmacros{#1}
+ \theCWEBbeforeindex
+ \ReadFile{#1.idx}\relax
+ \theCWEBafterindex
+ \par
+ \egroup}
+
+\def\processCWEBsections #1 %
+ {\bgroup
+ \resetCWEBcontext
+ \activateCWEB
+ \loadCWEBmacros{#1}
+ \parfillskip = 0pt plus 1fil
+ \parindent = 0pt
+ \let\topsecno=\nullsec
+ \def\note##1%
+ {\quad
+ \bgroup
+ \eightrm
+ ##1~\processCWEBsectionnotes}
+ \def\Q {\CWEBnotesfalse \note{Cited in section}} % crossref for mention of a section
+ \def\Qs{\CWEBnotestrue \note{Cited in sections}} % crossref for mentions of a section
+ \def\U {\CWEBnotesfalse \note{Used in section}} % crossref for use of a section
+ \def\Us{\CWEBnotestrue \note{Used in sections}} % crossref for uses of a section
+ \def\I {\par\hangindent 2em}%
+ \let\*=*
+ \message{Section names:}
+ \marking[CWEBfilename] {#1}
+ \marking[CWEBsectiontitle] {sections}
+ \marking[CWEBsectionnumber]{}
+ \marking[CWEBsectiondepth]{}
+ \loadCWEBmacros{#1}
+ \ReadFile{#1.scn}\relax
+ \par
+ \botofcontents
+ \par
+ \egroup}
+
+\def\processCWEBcontents #1 %
+ {\bgroup
+ \resetCWEBcontext
+ \activateCWEB
+ \loadCWEBmacros{#1}
+ \rightskip = 0pt
+ \hyphenpenalty = 50
+ \tolerance = 200
+ \parindent = 0pt
+ \line{\hfil Section\hbox to3em{\hss Page}}
+ \let\ZZ=\contentsline
+ \message{Table of contents:}
+ \marking[CWEBfilename] {#1}
+ \marking[CWEBsectiontitle] {table of contents}
+ \marking[CWEBsectionnumber]{}
+ \marking[CWEBsectiondepth]{}
+ \loadCWEBmacros{#1}
+ \ReadFile{#1.toc}\relax
+ \par
+ \egroup}
+
+\defCWEBmacro\contentsline#1#2#3#4#5%
+ {\ifnum#2=0
+ \smallbreak
+ \fi
+ \line{\consetup{#2}#1
+ \rm
+ \leaders\hbox to .5em{.\hfil}\hfil\
+ {\localcolortrue\goto{#3}[web:#3]}% below: \gotorealpage ? should be changed
+ \hbox to3em{\localcolortrue\hss\gotorealpage{}{}{#5}{\translatednumber[#4]\presetgoto}}}}
+
+%D A last hack, needed because a file can overload of the
+%D above. (Some day: a check like \type{\ifx#1\CWEBdefined}.)
+
+\def\outer#1#2%
+ {\ifx#2\undefined
+ \expandafter#1\expandafter#2%
+ \else
+ \expandafter#1\expandafter\ThrowAway
+ \fi}
+
+\endinput