% Special formatting for Computers and Typesetting: The Programs
\xdef\fmtversion{\fmtversion+TWIMAC}
\newif\ifsorted
\newread\sreffile \openin\sreffile=\jobname.sref
\newwrite\reffile
\ifeof\sreffile \immediate\openout\reffile=\jobname.ref \sortedfalse
\message{This is the first pass!}
\else \sortedtrue \message{This is the second pass!} \fi
\newdimen\em \em=10pt
\parskip 0pt % no stretch between paragraphs
\parindent 1\em % for paragraphs and for the first line of Pascal text
\font\tentex=cmtex10
\font\ninetex=cmtex9 % TeX extended character set (used in strings)
\font\eighttex=cmtex8
\def\\#1{\hbox{\it#1\/\kern.05em}} % italic type for identifiers
\def\|#1{\hbox{$#1$}} % one-letter identifiers look a bit better this way
\def\{\hbox{\bf#1\/}} % boldface type for reserved words
\def\.#1{\hbox{\ttx % typewriter type for strings
\let\\=\BS % backslash in a string
\let\'=\RQ % right quote in a string
\let\`=\LQ % left quote 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
#1}}
\def\#{\hbox{\tt\char`\#}} % parameter sign
\def\${\hbox{\tt\char`\$}} % dollar sign
\def\%{\hbox{\tt\char`\%}} % percent sign
\def\^{\ifmmode\mathchar"222 \else\char`^ \fi} % pointer or hat
% circumflex accents can be obtained from \^^D instead of \^
\def\AT!{@} % at sign for control text
\def\pct!{{\char`\%}} % percent sign in ordinary text
\chardef\AM=`\& % ampersand character in a string
\chardef\BS=`\\ % backslash in a string
\chardef\LB=`\{ % left brace in a string
\def\LQ{{\tt\char'22}} % left quote in a string
\chardef\RB=`\} % right brace in a string
\def\RQ{{\tt\char'23}} % right quote in a string
\def\SP{{\tt\char`\ }} % (visible) space in a string
\chardef\TL=`\~ % tilde in a string
\chardef\UL=`\_ % underline character in a string
\newbox\bak \setbox\bak=\hbox to -\em{} % backspace one em
\newbox\bakk\setbox\bakk=\hbox to -2\em{} % backspace two ems
\newcount\ind % current indentation in ems
\def\1{\global\advance\ind by1\hangindent\ind\em} % indent one more notch
\def\2{\global\advance\ind by-1} % indent one less notch
\def\3#1{\hfil\penalty#10\hfilneg} % optional break within a statement
\def\4{\copy\bak} % backspace one notch
\def\5{\hfil\penalty-1\hfilneg\kern2.5\em\copy\bakk\ignorespaces}%optional break
\def\6{\ifmmode\else\par % forced break
\hangindent\ind\em\noindent\kern\ind\em\copy\bakk\ignorespaces\fi}
\def\7{\Y\6} % forced break and a little extra space
\let\yskip=\smallskip
\def\to{\mathrel{.\,.}} % double dot, used only in math mode
\def\ellipsis{\kern5\em\smash{\vdots}\qquad\vbox to12pt{}\par}
\def\note#1#2.{\par\penalty5000
\Y\noindent{\hangindent2\em\baselineskip10pt\eightrm#1 #2.\par}}
\def\startsection{\Q\noindent\strut{\bf\modno.\quad}}
\def\defin#1{\global\advance\ind by 2 \1\&{#1 }} % begin `define' or `format'
\def\A{\note{See also}} % cross-reference for multiply defined section names
\def\B{\mathopen{\.{@\{}}} % begin controlled comment
\def\C#1{\ifmmode\gdef\XX{\null$\null}\else\gdef\XX{}\fi % Pascal comments
\XX\hfil\penalty-1\hfilneg\quad$\{\,$#1$\,\}$\XX}
\def\D{\defin{define}} % macro definition
\def\E{\cdot10^} % exponent in floating point constant
\def\F{\defin{format}} % format definition
\let\G=\ge % greater than or equal sign
\def\H#1{\hbox{\rm\char"7D\tt#1}} % hexadecimal constant
\let\I=\ne % unequal sign
\def\J{\.{@\&}} % TANGLE's join operation
\let\K=\gets % left arrow
\let\L=\le % less than or equal sign
\outer\def\M#1.{\def\modno{#1}\startsection\ignorespaces}
\outer\def\N#1. \[#2]#3.{\def\modno{#1}\flushout % begin starred section
\gdef\rhead{PART #2:\uppercase{#3}} % define running headline
\global\let\rrhead=\rhead
\message{*\modno} % progress report
\startsection{\bf\ignorespaces#3.\quad}\ignorespaces}
\outer\def\NN#1. \[#2]#3.{\def\modno{#1} % begin starred section on rh page
\global\setbox\partialpage=\vbox{
\vbox to 44pc{\box\partialpage\vfill}\break}
\gdef\rrhead{PART #2:\uppercase{#3}} % define running headline
\message{!\modno} % progress report
\startsection{\bf\ignorespaces#3.\quad}\ignorespaces}
\def\O#1{\hbox{\rm\char'23\kern-.2em\it#1\/\kern.05em}} % octal constant
\def\P{\iftenpoint \ninepoint\fi
\rightskip=0pt plus 100pt minus 10pt % go into Pascal mode
\sfcode`;=3000
\pretolerance 10000
\hyphenpenalty 10000 \exhyphenpenalty 10000
\global\ind=2 \1\ \unskip}
\def\Q{\tenpoint
\rightskip=0pt % get out of Pascal mode
\sfcode`;=1500 \pretolerance 200 \hyphenpenalty 50 \exhyphenpenalty 50 }
\let\R=\lnot % logical not
\let\S=\equiv % equivalence sign
\def\T{\mathclose{\.{@\}}}} % terminate controlled comment
\def\U{\note{This code is used in}} % cross-reference for uses of sections
\let\V=\lor % logical or
\let\W=\land % logical and
\def\X#1:#2\X{\ifmmode\gdef\XX{\null$\null}\else\gdef\XX{}\fi % section name
\XX$\langle\,$#2{\sevenrm\kern.5em#1}$\,\rangle$\XX}
\def\Y{\par\yskip}
\let\Z=\let % now you can \send the control sequence \Z
\def\){\hbox{\.{@\$}}} % sign for string pool check sum
\def\]{\hbox{\.{@\\}}} % sign for forced line break
\def\=#1{\kern2pt\hbox{\vrule\vtop{\vbox{\hrule
\hbox{\strut\kern2pt\.{#1}\kern2pt}}
\hrule}\vrule}\kern2pt} % verbatim string
\let\~=\ignorespaces
\newcount\nrefs % total number of references in partial page
\newcount\baseno % smallest module number in partial page
\countdef\nprefs=199 % the number in \prefs
\countdef\nfrefs=220 % the number in \frefs
\toksdef\prefs=199 \toksdef\frefs=220
% \count and \toks registers 200--219 are also used to keep track of refs
\newcount\nn \newcount\mm \newcount\pp
\newdimen\nsize \newdimen\msize
\newskip\intermodskip \intermodskip=8pt plus 2pt minus 3pt
\newbox\partialpage
\newbox\newmod
\newtoks\newrefs
\newdimen\ninept \ninept=9pt
\def\uline{_}
\begingroup\catcode`\_=\active \globaldefs=1
\def\flushout{\ifvoid\partialpage\else
\setbox0=\vsplit\partialpage to 44pc
\setbox2=\vbox{
\vbox to 3pc{
\hbox to 35pc{\vbox to10pt{}\nineit\rhead\hfil\eightrm\folio}\vfill}
\nointerlineskip\box0}%
\shipout\box2
\global\advance\pageno 1
\let\=\makeref
\ifsorted \let\readin=\readln \readrefs
\else \immediate\write\reffile{!\the\pageno}\let\readin=\readrefs \fi
\setbox0=\vbox{\eightpoint \hsize=11pc \catcode`\_=\active \let_=\_
\rightskip=0pt plus 100pt minus 10pt
\pretolerance 10000
\hyphenpenalty 10000 \exhyphenpenalty 10000
\noindent\vbox to1pt{}\par % 1pt = \topskip - \ninept
\readin}
\setbox2=\vbox to47pc{
\vbox to 3pc{
\hbox to 35pc{\vbox to10pt{}\eightrm\folio\hfil\nineit\rrhead\/}\vfill}
\unvbox\partialpage
\vfill
\ifdim\ht0>1pt \kern11pt\hrule \hbox{% changed 8pt to 11pt Oct 87 by DEK!
\nsize=\ht0 \advance\nsize-\topskip
\divide\nsize by 3 \divide\nsize by\ninept
\multiply\nsize by\ninept \advance\nsize\topskip
\vsplit0 to\nsize \kern1pc
\msize=\ht0 \advance\msize-\topskip
\divide\msize by 2 \divide\msize by\ninept
\multiply\msize by\ninept \advance\msize\topskip
\vbox to\nsize{\vsplit0 to\msize\vss}\kern1pc
\vbox to\nsize{\box0\vss}} \fi}%
\shipout\box2
\global\advance\pageno 1 \global\let\rhead=\rrhead\fi
{\globaldefs=1
\nn=199 \loop \ifnum\nn<221 \toks\nn={} \count\nn=0 \advance\nn 1 \repeat
\nrefs=0
\baseno=\modno}}
% the remaining stuff applies only to the rear matter
\newif\ifpagesaved
\def\lheader{\vbox to10pt{}\nineit\rhead\hfil\eightrm\folio}
\def\rheader{\vbox to10pt{}\eightrm\folio\hfil\nineit\rhead\/}
\def\page{\box255 }
\def\normaloutput#1{\setbox2=\vbox{
\vbox to 3pc{
\hbox to 35pc{\ifodd\pageno\rheader\else\lheader\fi}\vfill}
\nointerlineskip#1}%
\shipout\box2
\global\advance\pageno 1 }
\newbox\sbox % saved box preceding the index
\newbox\lbox % lefthand column in the index
\def\inx{\box\partialpage
\vskip24pt plus 1fil % we are beginning the index
\output{\ifpagesaved\normaloutput{\box\sbox}\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=44pc \advance\vsize by -\ht\sbox % the remaining height
\hsize=17pc % column width for the index (1pc between cols)
\eightpoint
\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 to44pc{\box\sbox\vss
\hbox to35pc{\box\lbox\hfil\page}}}
\global\vsize=44pc\gdef\lr{L}\global\pagesavedfalse\fi}
\message{Index:}
\parskip 0pt plus .5pt
\gdef\rhead{INDEX}
\outer\def\:##1, {\par\hangindent2em\noindent##1:\kern1em} % index entry
\let\ttentry=\. \def\.##1{\ttentry{##1\kern.2em}} % give \tt a little room
\def\[##1]{$\underline{##1}$} % underlined index item
\rm \rightskip0pt plus 2.5em \tolerance 10000
\hyphenpenalty 10000 \parindent0pt}
\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
\gdef\rhead{NAMES OF THE SECTIONS}
\message{Section names:}
\output{\normaloutput\page}
\ninepoint
\hsize=35pc \vsize=44pc
\def\note##1##2.{\hfil\penalty-1\hfilneg\quad{\eightrm##1 ##2.}}
\linepenalty=10 % try to conserve lines
\def\U{\note{Used in}} % cross-reference for uses of sections
\def\:{\par\hangindent 2em}\let\*=*\let\.=\ttentry}
\def\con{\par\vfill\eject\end} % finish the section names
% To produce only a subset of pages, put the page numbers on separate
% lines in a file called pages.tex
\let\Shipout=\shipout
\newread\pages \newcount\nextpage \openin\pages=pages
\def\getnextpage{\ifeof\pages\else
{\endlinechar=-1\read\pages to\next
\ifx\next\empty % in this case we should have eof now
\else\global\nextpage=\next\fi}\fi}
\ifeof\pages\else\message{OK, I'll ship only the requested pages!}
\getnextpage\fi
\def\shipout{\ifeof\pages\let\next=\Shipout
\else\ifnum\pageno=\nextpage\getnextpage\let\next=\Shipout
\else\let\next=\Tosspage\fi\fi \next}
\newbox\garbage \def\Tosspage{\deadcycles=0\setbox\garbage=}
