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303 lines
10 KiB
TeX
303 lines
10 KiB
TeX
% varwidth.sty v 0.9a Mar 2003 Donald Arseneau asnd@triumf.ca
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%
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% Copyright 2003 by Donald Arseneau (asnd@triumf.ca).
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% This software is released under the terms of the LaTeX Project Public
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% License (ftp://ctan.tug.org/tex-archive/macros/latex/base/lppl.txt).
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% (Essentially: Free to use, copy, distribute (sell) and change, but, if
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% changed, the name must be changed.)
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%
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% The varwidth environment is based on minipage, and takes the same
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% parameters, but the specified width is just a maximum value -- the
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% environment will be typeset with a narrower "natural" width if
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% possible.
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%
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% In a varwidth environment, paragraph line-breaks are chosen
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% according to the specified width, but each line is reset to
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% match a narrower natural width, if there is one.
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%
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% The \narrowragged command works like \raggedright, but produces
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% generally narrower lines in paragraphs, but more text in the last
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% line (the lines have more-equal lengths).
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%
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% This version works fine, but there are still many questions about
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% how it would work best. Should there be a version that avoids the
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% usual minipage formatting style?
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%
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% Numbered equations are not handled well, especially with leqno.
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% AMSmath environments have not been tried, and undoubtedly fail.
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%
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% To do: Extend v-list wrappers to handle all e-TeX primitives.
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% (pdfTeX too?)
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% Capture marks and floats, propagating them out of the box
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% Support numbered equations, including ams math.
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%
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\ProvidesPackage{varwidth}[2003/03/10 ver 0.9a; \space
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Variable-width minipages]
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\newcommand\narrowragged{\rightskip \z@ plus .25\hsize
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\@rightskip\rightskip \parfillskip\z@ plus .15\hsize
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\sloppy }
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\newbox\@vwid@box
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% The varwidth environment is based on minipage, and takes the same
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% parameters, but the specified width is only a limit -- a narrower
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% natural width may be used. \varwidth uses \minipage.
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\def\varwidth{\let\@minipagerestore\@vwid@setup \minipage}
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% Many things may appear on vertical lists that can't be re-processed,
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% so they have to be modified.
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\def\@vwid@setup{%
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% several things can't appear in vertical mode, so they may get
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% a \vbox wrapped around them.
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\let\@bsphack\@vwid@bsphack % \label and others
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\let\mark\@gobble % Marks disappear in minipages anyway
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\let\@special\@vwid@special % \color and others
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\let\addtocontents\@vwid@addtocontents % \addcontentsline
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% Shifted boxes (\parshape,\hangindent) will have their shifts
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% indicated in a separate box.
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\let\@hangfrom\@vwid@hangfrom % hanging indents
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\let\list\@vwid@list
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\let\endtrivlist\@vwid@endtrivlist
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\postdisplaypenalty\@vwid@posteqp
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\predisplaypenalty\@vwid@preeqp
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\def\@eqnnum{\aftergroup\@vwid@afterva\@@vwid@eqnnum}%
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\global\@vwid@roff\z@ \global\@vwid@loff\z@
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% Begin an inner minipage-like vertical box (in \@tempboxa)
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\let\@minipagerestore\@@vwid@minipagerestore \@minipagerestore
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\setbox\@tempboxa\vbox\bgroup\begingroup
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% Flag the top of the list
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\penalty\@vwid@toppen
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}
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\let\@@vwid@minipagerestore\@minipagerestore
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% At end of varwidth environment.
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\def\endvarwidth{\par\@@par
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% Handle minipage-style notes.
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\ifvoid\@mpfootins\else
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\vskip\skip\@mpfootins
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\normalcolor
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\@vwid@wrap\footnoterule
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\unvbox\@mpfootins
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\fi
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\unskip
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\endgroup\egroup % got my \@tempboxa
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% {\showoutput\showbox\@tempboxa}%
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% in a discarded box, sift through list measuring max width.
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\begingroup\setbox\z@\vbox\bgroup
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%\message{-------------------------------------------------------------}%
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%\message{First pass; hsize=\the\hsize... }%{\tracingall\showlists}%%
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\unvcopy\@tempboxa
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\@tempdima-\maxdimen
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\let\@vwid@resetb\@vwid@measure
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\let\@vwid@append\relax
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\sift@deathcycles\z@
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\@vwid@sift
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\xdef\@vwid@{\the\@tempdima}%
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\egroup\endgroup
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% Done measuring. Now empty \@tempboxa onto current vertical list
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% which is the contents of a minipage environment
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%\message{Got natural width \@vwid@. }%
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\unvbox\@tempboxa
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% If the natural width is narrower, then go back through the list
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% reboxing and moving everything into \@vwid@box; then spill \@vwid@box
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\ifdim\@vwid@<\hsize
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\hsize\@vwid@
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\setbox\@vwid@box\vbox{}%
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\sift@deathcycles\z@
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%\message{----------------------------------------------------------------}%
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%\message{Second pass; hsize=\the\hsize... }%{\tracingall\showlists}%
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\@vwid@sift
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\unvbox\@vwid@box
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\fi
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% end the minipage environment
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\endminipage}
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%
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% Here are definitions for sifting through the vertical list, either
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% measuring things or reboxing them.
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%
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% Penalties used as signals to the vertical-list processor:
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\mathchardef\@vwid@posteqp 17321 % Penalty below equations
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\mathchardef\@vwid@preeqp 17322 % Penalty above equations
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\mathchardef\@vwid@postnump 17323 % Penalty below numbered equations
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\mathchardef\@vwid@toppen 17324 % Penalty marking top of vertical list
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\mathchardef\@vwid@offsets 17325 % Penalty below special h-offsets box
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\mathchardef\@vwid@postw 17326 % Penalty below a \vbox-wrapped object
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\newcount\sift@deathcycles
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\def\@vwid@sift{%
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\skip@\lastskip\unskip
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\dimen@\lastkern\unkern
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\count@\lastpenalty\unpenalty
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\setbox\z@\lastbox
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%{\showoutput\showbox\z@}%
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\ifvoid\z@ \advance\sift@deathcycles\@ne \else \sift@deathcycles\z@ \fi
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\ifnum\sift@deathcycles>33
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\let\@vwid@sift\relax
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\PackageWarning{varwidth}{Failed to reprocess entire contents}%
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\fi
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%\message{\the\sift@deathcycles: skip \the\skip@; kern \the\dimen@; penalty \the\count@. }%
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%\ifhbox\z@\setbox99\hbox to0pt{\unhcopy\z@}\fi % = message
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\ifnum\count@=\@vwid@preeqp \@vwid@eqmodefalse\fi
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%\ifnum\count@=\@vwid@preeqp \message{End equation mode. }\fi
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\ifnum\count@=\@vwid@posteqp \@vwid@eqmodetrue\fi
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%\ifnum\count@=\@vwid@posteqp\message{Begin equation mode. }\fi
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%\if@vwid@eqmode {\showoutput\showbox\z@}\fi
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\ifnum\count@=\@vwid@toppen % finished
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\let\@vwid@sift\relax
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\else\ifnum\count@=\@vwid@offsets
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\@vwid@setoffsets
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\else
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\ifnum\count@=\@vwid@postw
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\else
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\@vwid@resetb % reset box \z@ or measure it
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\fi
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\@vwid@append
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\fi\fi
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\@vwid@sift}
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\def\@vwid@setoffsets{%
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\setbox\z@=\hbox{\unhbox\z@
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\global\@vwid@roff\lastkern\unkern
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\global\@vwid@loff\lastkern\unkern}%
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%\message{Set offsets to \the\@vwid@loff, \the\@vwid@roff. }%
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}
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\def\@vwid@append{% Append contents of box \z@ and glue to \@vwid@box
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\setbox\@vwid@box\vbox{%
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\unvbox\z@
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\ifdim\dimen@=\z@\else \kern\dimen@ \fi
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\vskip\skip@
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\unvbox\@vwid@box
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}%{\tracingall\showbox\@vwid@box}%
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}
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% reset box \z@ to \hsize, applying shifts, and wrap in vbox
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% Don't worry about numbered equations because we won't get
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% here if there are any.
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\def\@vwid@resetb{%
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\setbox\z@\vbox\bgroup
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\ifvoid\z@
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\else
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\ifvbox\z@
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\box\z@
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\else % \hbox
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\@tempdima\hsize
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\advance\@tempdima-\@vwid@roff
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\advance\@tempdima-\@vwid@loff
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\advance\@tempdima-\p@
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\ifdim\wd\z@>\@tempdima % full-width line; rebox it
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%\message{An ordinary line or alignment. }%
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\hbox to\hsize
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{\kern\@vwid@loff \unhbox\z@ \kern\@vwid@roff}%
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\else % an equation or direct \hbox
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\if@vwid@eqmode % re-center unnumbered equations
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%\message{A centered equation hsize=\the\hsize. }%
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\hbox to\hsize
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{\hskip\@vwid@loff\@plus1fil
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\unhbox\z@ \hskip\@vwid@roff\@plus1fil}%
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\else % plain narrow \hbox; leave it as-is
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\box\z@
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\fi\fi\fi\fi
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\egroup}
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\def\@vwid@measure{%
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\ifvoid\z@
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\else
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% numbered equations not part of alignments can't be reset,
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% so force retention of full width.
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\ifnum\count@=\@vwid@postnump \ifdim\wd\z@<\linewidth
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\ifdim\@tempdima<\linewidth \@tempdima\linewidth \fi
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\fi\fi
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\ifhbox\z@
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\setbox\z@=\hbox
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{\kern\@vwid@loff \unhbox\z@ \kern\@vwid@roff}%
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\fi
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\ifdim\wd\z@>\@tempdima \@tempdima\wd\z@ \fi
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\fi}
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\newdimen\@vwid@loff
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\newdimen\@vwid@roff
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\let\@@bsphack\@bsphack
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\let\@@esphack\@esphack
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\let\@@esphack\@Esphack
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\def\@vwid@bsphack{\@@bsphack
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\ifx\@vwid@wrap\@firstofone
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\bgroup
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\else
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\ifvmode
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\setbox\@vwid@box \vbox\bgroup \vbox\bgroup
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\let\@vwid@wrap\@firstofone
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\def\@esphack{\@vwid@esphack\@@esphack}%
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\def\@Esphack{\@vwid@esphack\@@Esphack}%
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\fi
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\fi}
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\def\@vwid@esphack{\egroup
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\ifx\@vwid@wrap\@firstofone\else
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\egroup % end outer box
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\unvbox\@vwid@box % put inner box on list without lineskip
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\penalty\@vwid@postw
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\fi}
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% \vbox Wrapper for misc vlist items
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\long\def\@vwid@wrap{\relax
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\ifvmode\expandafter\@vwid@dowrap \else \expandafter\@firstofone \fi}
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\long\def\@vwid@dowrap#1{%
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\setbox\@vwid@box \vbox{\vbox{\let\@vwid@wrap\@firstofone
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#1}\penalty\@vwid@postw
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}\unvbox\@vwid@box }
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\let\@@vwid@special\special
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\let\@@vwid@addtocontents\addtocontents
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\let\@@vwid@list\list
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\let\@@vwid@endtrivlist\endtrivlist
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\let\@@vwid@eqnnum\@eqnnum
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\long\def\@vwid@special#1{\@vwid@wrap{\@@vwid@special{#1}}}
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\long\def\@vwid@addtocontents#1#2{\@vwid@wrap{\@@vwid@addtocontents{#1}{#2}}}
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\long\def\@vwid@hangfrom#1{\par
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\setbox\@tempboxa\hbox{{#1}}%
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\setbox\@vwid@box \vbox{\hbox{\kern\z@ \kern\z@
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}\penalty\@vwid@offsets}\unvbox\@vwid@box
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\def\par{\relax\ifhmode\unskip\fi
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\vadjust{\hbox{\kern\hangindent\kern\z@}\penalty\@vwid@offsets}%
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\@restorepar\par}%
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\hangindent \wd\@tempboxa\noindent\box\@tempboxa}
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\def\@vwid@list{\@vwid@setlist\@@vwid@list}
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\def\@vwid@endtrivlist{\@vwid@setlist\@@vwid@endtrivlist}
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\def\@vwid@setlist{\relax\ifhmode \unskip\expandafter\vadjust\fi
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{\setbox\@vwid@box \vbox{\hbox{%
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\advance\hsize-\linewidth \advance\hsize-\@totalleftmargin
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\kern\@totalleftmargin \kern\hsize}%
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\penalty\@vwid@offsets}%
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\unvbox\@vwid@box}}
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\newif\if@vwid@eqmode
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\def\@vwid@afterva{\vadjust{\penalty\@vwid@postnump}}
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% Should I do this? ...
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\@ifundefined{newcolumntype}{}{%
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\@ifundefined{NC@rewrite@V}{
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\newcolumntype{V}[1]{%
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>{\begin{varwidth}[t]{#1}\narrowragged\let\\\tabularnewline}%
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l%
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<{\@finalstrut\@arstrutbox\end{varwidth}}}
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}{}
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}
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