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+% truncate.sty ver 3.6 20-Aug-2001 Donald Arseneau
+% This LaTeX program is released to the public domain.
+%
+% Truncate text to a specified width: \truncate [marker]{width}{text}
+%
+% If the text is too wide to fit in the specified width, then it is
+% truncated, and a continuation marker is shown at the end. The default
+% marker, used when the optional "[marker]" parameter is omitted, is
+% "\,\dots". You can change this default by redefining "\TruncateMarker"
+% ("\renewcommand{\TruncateMarker}{}").
+%
+% Normally, the text (whether truncated or not) is printed flush-left
+% in a box with exactly the width specified. The package option "[fit]"
+% ("\usepackage[fit]{truncate}") causes the output text to have its
+% natural width, up to a maximum of the specified width.
+%
+% The text will not normally be truncated in the middle of a word,
+% nor at a space specified by the tie "~". For example:
+%
+% "\truncate{122pt}{This text has been~truncated}"
+% gives
+% "This text has... "
+%
+% You can give one of the package options "[hyphenate]", "[breakwords]",
+% or "[breakall]" to allow breaking in the middle of words. The first
+% two only truncate at hyphenation points; with the difference being that
+% "breakwords" suppresses the hyphen character. On the other hand,
+% "breakall" allows truncation at any character. For example:
+%
+% "\truncate{122pt}{This text has been~truncated}"
+% gives
+% "This text has been trun-..." (hyphenate)
+% "This text has been trun... " (breakwords)
+% "This text has been trunc..." (breakall)
+%
+% (All of these options work through TeX's hyphenation mechanism.)
+%
+\ProvidesPackage{truncate}[2001/08/20 \space ver 3.6]
+%
+% [breakwords] allows hyphenation but with invisible hyphen characters
+\DeclareOption{breakwords}{%
+ \let\@Trunc@DoSelect\relax
+ \expandafter\chardef\csname \string\@TruncHyph T1\endcsname 23
+ \expandafter\chardef\csname \string\@TruncHyph OT1\endcsname 223
+ \expandafter\chardef\csname \string\@TruncHyph LY1\endcsname 0
+ \def\@Trunc@Post{\hyphenpenalty\tw@ \exhyphenpenalty\tw@
+ \doublehyphendemerits\z@ \finalhyphendemerits\z@
+ \the\@Trunc@RestHyph % set invisible hyphenchars for all fonts used
+ }}
+%
+% [breakall] is like breakwords, but all characters are treated like
+% the letter "c"; the default language 0 patterns allow hyphenation
+% c-c-c-c-c-c-c-c-c. This means we don't need special patterns!
+\DeclareOption{breakall}{\ExecuteOptions{breakwords}%
+ \expandafter\def\expandafter\@Trunc@Post\expandafter{\@Trunc@Post
+ \@tempcnta\z@ \chardef\c`\c % in knuth patterns, c allows hyphens
+ \loop \lccode\@tempcnta\c \advance\@tempcnta\@ne
+ \ifnum\@tempcnta<\@cclvi \repeat}%
+ \def\@Trunc@Pre{% force US english
+ \lefthyphenmin\@ne \righthyphenmin\@ne
+ \doublehyphendemerits\language
+ \language\z@ % default English language
+ \let\language\doublehyphendemerits
+ \uchyph\@ne
+ }}
+%
+% [hyphenate] ordinary hyphenation for breakpoints
+\DeclareOption{hyphenate}{% takes precedence over breakwords
+ \def\@Trunc@Post{\hyphenpenalty\sixt@@n}\let\@Trunc@Pre\relax}
+%
+% [fit] use true size of truncated text, not requested size.
+\DeclareOption{fit}{\def\@Trunc@Rebox{%
+ \setbox\z@\hbox{\unhbox\z@\unskip\unskip\@tempa}%
+ \ifdim\wd\z@>\hsize \hbox to\hsize{\unhbox\z@}\else \box\z@ \fi}}
+%
+% Defaults:
+\let\@Trunc@Pre\@empty
+\def\@Trunc@Post{\hyphenpenalty\@M}
+\def\@Trunc@Rebox{\hbox to\hsize{\unhbox\z@\unskip\unskip\@tempa\hfil}}
+\let\@Trunc@DoSelect\@empty
+
+\ProcessOptions\relax
+
+\providecommand{\TruncateMarker}{\,\dots}
+
+\newcommand{\truncate}[3][\TruncateMarker]{% #1=marker #2=width #3=text
+ \parbox[b]{#2}{\tolerance9999 \emergencystretch .216\hsize
+ \vbadness\maxdimen \vfuzz\vsize % no overfull warnings
+ \hbadness\maxdimen \hfuzz\vsize
+ % set up hyphenchar switching for all fonts used.
+ \edef\@tempb{\the\@Trunc@RestHyph}% save whole stack
+ \global\@Trunc@RestHyph{}%
+ \ifx\@Trunc@DoSelect\relax
+ \let\@Trunc@DoSelect\selectfont
+ \def\selectfont{\@Trunc@DoSelect\@Trunc@SaveHChar}%
+ \fi
+ \@Trunc@SaveHChar % do it for current font
+ \setbox\z@\vbox\bgroup
+ % First set text in a hbox to see if it fits.
+ \setbox\z@\@@line{\ignorespaces #3\unskip\hfil}%
+ \ifnum\badness>\@M % text does not fit
+ \settowidth\rightskip{#1}%
+ \advance\rightskip \z@\@plus\p@
+ \parfillskip-\@ne\rightskip \@plus\@ne fil
+ \parshape \tw@ \z@\hsize \z@\maxdimen \linepenalty60
+ \tracinglostchars\z@
+ %% \let\par\relax -- don't do this because \vskip causes infinite loop
+ \@Trunc@Pre % must set language before paragraph
+ \noindent \vadjust{\penalty-\@MM}% for splitting off first line
+ \nobreak\hskip\z@skip % allow first word hyphenation
+ \ignorespaces #3% the text
+ \pretolerance\hyphenpenalty \@Trunc@Post % set up `hyphenation'
+ \@@par
+ \ifnum\prevgraf>\@ne
+ \egroup \def\@tempa{#1}% use truncation marker
+ \else
+ \egroup \let\@tempa\@empty% no linebreak, so all text fits; no marker
+ \fi
+ \else
+ \box\z@ \egroup \let\@tempa\@empty
+ \fi
+ \setbox\@tempboxa\vsplit\z@ to\z@ \unvbox\@tempboxa
+ \unskip\unpenalty\unpenalty
+ \setbox\z@\lastbox
+ \nointerlineskip
+ \hfuzz\p@
+ \@Trunc@Rebox
+ \let\@Trunc@HC\@firstofone \the\@Trunc@RestHyph % restore hyphenchars
+ \global\@Trunc@RestHyph\expandafter{\@tempb}% restore the stack itself
+ }}
+% (Note that the text may be proessed twice. I could avoid that
+% if there are problems with global counters etc.)
+
+% we save (implicit global) hyphenchar settings for each font on a
+% manual stack -- the token register \@Trunc@RestHyph -- before changing
+% them. We execute \@Trunc@RestHyph to set them to the invisible
+% characters and then again to restore them. (I can't imagine this
+% will ever be required.)
+\newtoks\@Trunc@RestHyph
+\global\@Trunc@RestHyph{}
+%
+\def\@Trunc@SaveHChar{\begingroup
+ \edef\@tempa{%
+ \hyphenchar\the\font=\noexpand\@Trunc@HC{\the\hyphenchar\font}\relax
+ \the\@Trunc@RestHyph}%
+ \global\@Trunc@RestHyph\expandafter{\@tempa}%
+% \hyphenchar\font\z@
+ \endgroup}
+%
+% select an invisible character for hyphenation. Use \textcompwordmark, if
+% any; use selected numbers for certain encodings (OT1 uses a *missing*
+% character); use a space otherwise.
+\def\@Trunc@HC#1{%
+ \@ifundefined{\f@encoding\string\textcompwordmark}{%
+ \@ifundefined{\string\@TruncHyph\f@encoding}%
+ {32}% If no appropriate character, guess space character may be blank
+ {\csname \string\@TruncHyph\f@encoding\endcsname}%
+ }{\csname\f@encoding\string\textcompwordmark\endcsname}}%