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%%%
%%% Macros to typeset Discourse Representation Structures (DRSs).
%%% Based on DRS macros in covingtn.sty
%%%
%%% Written by Alexis Dimitriadis (a.dimitriadis at uu.nl)
%%%
%%% This package may be used, distributed and modified unter the terms of the
%%% LaTeX Project Public License, either version 1.3 of this license or (at your
%%% option) any later version.
%%%
%%% The latest version of the LaTeX Project Public License can be found at this URL:
%%% http://www.latex-project.org/lppl.txt
\ProvidesPackage {drs}
[2010/06/10 typeset Discourse Representation Structures v. 1.1b]
% REVISION HISTORY
%
% 2010/06/10 v. 1.1 Small modifications for compatibility with memoir and array.sty.
% Thanks to Alan Munn and Antonio Fortin for reporting the problem.
% Added robustness enhancements, pict2e support, and LPPL license.
%
% 2004/02/17 Corrected some typos in documentation
%
% 2000/06/15 v. 1.0 Original stable version
%% This package draws Discourse Representation Structures (DRSs). It can draw
%% embedded DRSs, if-then conditions and quantificational ``duplex
%% conditions'' (with a properly scaled connecting diamond). Formatting
%% parameters allow the user to control the appearance and placement of DRSs,
%% and of DRS variables and conditions.
% \drs typesets a DRS in box notation a la Kamp.
% \drs* Same, but typeset as a ``partial'' drs (centered on the
% baseline, and with no extra spacing above or below)
%
% Arguments:
% 1. List of discourse variables
% 2. List of conditions separated by \\
%
% Example: \drs{X}{donkey(X)\\green(X)}
%
% Example: \drs{}{purple(X,Y)} (no variables line)
%
% Example: \drs{X}
% {named(X,`Pedro') \\
% \drs{Y}{donkey(Y)\\owns(X,Y)}~~
% {\large $\Rightarrow$}~
% \drs{~}{feeds(X,Y)}
% }
% \ifdrs forms 2 DRSes joined with a big arrow.
% Usually used for DRSes nested within another.
%
% Example: \ifdrs{X}{donkey(X)\\hungry(X)}
% {~}{feeds(Pedro,X)}
% \qdrs Form a ``duplex condition'' representing a quantifier.
%
% Example: \qdrs{}{man(x)}{every}{x}{y}{mother-of(x, y)\\
% loves(x, y)}
% \negdrs forms a DRS preceded by the negation symbol.
%
% Example: \negdrs{X}{donkey(X)\\green(X)}
% \sdrs like \drs but first argument is a sentence
% to be displayed above the drs.
%
% Example: \sdrs{A donkey is green.}{X}{donkey(X)\\green(X)}
% \alifdrs is like \ifdrs but shifted to the left so that an
% embedded `if' structure will line up with ordinary
% DRS conditions.
% memoir-compatible definitions; if you use article.cls, \it and \rm also work
\def\drsvarfont{\normalfont\itshape} % Font for variables
\def\drscondfont{\normalfont\rmfamily} % Font for conditions
\let\drsseparator=\hline % Separator between variables and conditions
\let\drsalignment=c % Alignment of material in boxes (l/c/r)
\let\drsboxalignh=c % Horizontal alignment of top-level DRS box in page
\let\drsboxalignv=c % Vertical alignment (with the baseline: t/c/b)
% \def\drsarraystretch{1} % undefined by default: value for \arraystretch
\edef\drslinewidth{\the\arrayrulewidth} % Line thickness: Start with default for tabular
\newcount\@drslevel \@drslevel=0
\def\drs@strut{{\large\strut}}
% \drs* gives a ``partial DRS'' (treated as if it appears inside another DRS)
% \drs begins a group that's ended by \@drs
\newcommand{\drs}{\bgroup
\@drs@set@align
\@ifstar{\advance\@drslevel by 1 \relax} \relax
\expandafter\@drs\@drs@cleanalign }
% These contortions are required because memoir and array will not accept a macro
% as a column alignment specifier. Simpler solutions would be possible if we KNEW whether
% \drsalignment has been set with \def/renewcommand or with \let. Restricting the user is
% ugly, so we \def a macro from what we're given.
%
\def\@drs@set@align{%
\def\@drs@cleanalign{c}% a default, in case of bad values
% \expandafter is needed in case \drsalignment was \def'ed; with \let, it's harmless
\expandafter\ifx \drsalignment c\def\@drs@cleanalign{c}\fi
\expandafter\ifx \drsalignment l\def\@drs@cleanalign{l}\fi
\expandafter\ifx \drsalignment r\def\@drs@cleanalign{r}\fi }
\newcommand{\@drs}[3]
{\advance\@drslevel by 1 \relax
\leavevmode
\ifnum\@drslevel>1
\let\drsboxalignv=c% Embedded boxes should be centered on the baseline
\else % Alignment options for top-level boxes only:
\expandafter\ifx \drsboxalignh c\hbox{}\hfil \fi \fi
% \expandafter is needed if \drsboxalignh was \def'ed; with \let, it's harmless
\arrayrulewidth=\drslinewidth
\@ifundefined{drsarraystretch} {} {\edef\arraystretch{\drsarraystretch}}%
\begin{tabular}[\drsboxalignv]{|@{}r@{}|}
\ifnum\@drslevel>1\noalign{\vskip 0.7ex}\fi %% ??
\hline
\drscondfont
{\begin{tabular}[b]{#1}
% Do not allocate space for variables if none are given
\def\@tempa{#2}\ifx\@tempa\empty \else
\drs@strut
\drsvarfont {\ignorespaces #2\strut\relax }\\
\drsseparator % Spacing is the same whether this is \hline or \relax
\fi
\drs@strut % extra space above and below (text) condition
\strut % A failsafe, in case the user selected a large font
\ignorespaces #3 % do not place \relax here! It confuses the next test
% End line unless the user already did
\ifvmode \else \\ \fi
% (can't vspace here or the line will come out wrong)
\end{tabular}}%
\vrule height 0pt width 0pt depth \baselinestretch\dp\strutbox
\drs@strut % extra space above and below (text) conditions
\\[2pt] \hline
\ifnum\@drslevel>1\noalign{\vskip 0.7ex}\fi % extra for embedded DRSs
\end{tabular}\egroup} % close the \bgroup in \drs
% Connect two DRSs with the middle argument (presumably a logical connective).
% This is worth providing because centering would separate DRSs from the
% connectives, unless everything is enclosed in an mbox as we do here.
\newcommand\condrs[5]
{\mbox{\let\drsboxalignv=c\drs{#1}{#2}{\large\ \ {#3}\ \ }\drs{#4}{#5}}}
\newcommand{\ifdrs}[4]{\condrs{#1}{#2}{$\Rightarrow\!\,$}{#3}{#4}}
\newcommand{\qdrs}[6]
{\mbox{\let\drsboxalignv=c\drs{#1}{#2}\drsdiamond{#3}{#4}\drs{#5}{#6}}}
\newcommand{\negdrs}[2]
{\mbox{{\large $\neg$ }\drs{#1}{#2}~}} % offset by a ~ for better centering
% like \ifdrs but shifted to the left so that an embedded `if' structure will
% line up with ordinary DRS conditions. (Useful for left-aligned DRSs only).
\newcommand{\alifdrs}[4]
{\mbox{$\!\!\!$\ifdrs{#1}{#2}{#3}{#4}}}
% A DRS with the associated sentence.
\newcommand{\sdrs}[3]
{\begin{tabular}{l}
\mbox{\it #1} \\
~ \\
\drs{#2}{#3}
\end{tabular}}
\newbox\@drsbox
% Draw a diagonal square (diamond) containing a quantifier and variable.
%
% Ridiculously complicated diamond algorithm: fit the smallest diamond around
% the _trapezoid_ enclosing a longer top line and a short variable at the
% bottom. Special-case boxes with really, really wide top part.
%
% Syntax: \drsdiamond{quantifier}{variable}
\newcommand{\drsdiamond}[2]{{%
\setbox\@drsbox\hbox{\def\baselinestretch{1}\@currsize
\begin{tabular}{@{}c@{}}
\drscondfont {#1}\\\drsvarfont {~#2~\null}\end{tabular}}%
% Compute the necessary dimensions
\@tempcnta=\ht\@drsbox \relax
\advance\@tempcnta by \dp\@drsbox \relax
\edef\@H{\the\@tempcnta}% % height
%
\@tempcnta=\wd\@drsbox
\edef\@boxdims{(\the\@tempcnta,\@H)}% % box dimensions
\divide\@tempcnta by 2
\edef\@A{\the\@tempcnta}% % 1/2 top width
%
% Measure the bottom line separately so we can pretend we're a trapezoid
\setbox\@tempboxa\hbox{ \drsvarfont{#2 }}%
\@tempcnta=\wd\@tempboxa
\divide\@tempcnta by 2
\edef\@B{\the\@tempcnta}% % 1/2 bottom row width
%
\@tempcnta=\@H
\advance\@tempcnta by \@B
\ifnum \@A > \@tempcnta % Angle is less than 45 degrees: center on top part
% start over: measure just the top part
\setbox\@tempboxa\hbox{\def\baselinestretch{1}\@currsize
\begin{tabular}{@{}c@{}}\drscondfont{#1}\end{tabular}}%
\@tempcnta=\ht\@tempboxa
\advance\@tempcnta by \dp\@tempboxa
\divide\@tempcnta by 2
\edef\@topH{\the\@tempcnta}% % HALF the height of the top part
\advance\@tempcnta by \@A
\edef\@D{\the\@tempcnta}%
\advance\@tempcnta by -\@H
\advance\@tempcnta by \@topH
\edef\@boxcoords{(\@topH,\the\@tempcnta)}%
\else % Angle over 45: diamond goes across all corners
\advance \@tempcnta by \@A\relax \divide \@tempcnta by 2
\edef\@D{\the\@tempcnta}%
\advance\@tempcnta by -\@A
\edef\@boxcoords{(\the\@tempcnta,\@B)}%
\fi
%
\@tempcnta=\@D
\multiply\@tempcnta by 2
\edef\@twoD{\the\@tempcnta}%
%
\unitlength=1sp % ``scaled points,'' like the counter values
\linethickness{\drslinewidth}% only effective if pict2e.sty is loaded
% If eepic is loaded, match our lines to the DRS borders
\@ifundefined{allinethickness}\relax{\allinethickness{\the\arrayrulewidth}}%
\parbox[c]{\@twoD sp}{{\vskip 2pt%
\begin{picture}(\@twoD,\@twoD)
\put(0,\@D){\line(1,-1)\@D}
\put(0,\@D){\line(1,1)\@D}
\put(\@twoD,\@D){\line(-1,1)\@D}
\put(\@twoD,\@D){\line(-1,-1)\@D}
% change \makebox to \framebox to see the placement
\expandafter\put\@boxcoords{\expandafter\makebox\@boxdims{\box\@drsbox}}
\end{picture}\vskip 2pt}}}}
% BETTER DOUBLE SPACING: by default, tall material can come arbitrarily close
% to the previous line. Calling \drshacksetspace redefines setspace.sty
% internals, causing it to adjust TeX formatting parameters that force a
% portion of each line to stay empty. This really should be part of
% setspace.sty.
% setspace.sty redefines the footnotes, but they do not call setstretch, alas.
% So the spacing will still be incorrect in footnotes.
\def\drshacksetspace{\@ifundefined{setstretch}\relax {%
% Ensure that HALF of the lineskip above the normal (singlespacing) value
% will stay empty
\def\adj@lineskip{%
\@tempdima=\baselinestretch\baselineskip
\advance\@tempdima by -\setspace@singlespace\baselineskip
\divide\@tempdima by 2
\lineskiplimit=\@tempdima
\lineskip=\lineskiplimit
\ifdim\@tempdima=0pt \lineskip=1pt\fi}%
% Arrange to recompute lineskip whenever spacing changes
\renewcommand{\setstretch}[1]
{\def\baselinestretch{##1}\@currsize\adj@lineskip}%
% Now run setstretch in case it's already been invoked (at the preamble)
\expandafter\expandafter
\expandafter\setstretch\expandafter{\baselinestretch}}}
\endinput
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