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% avm.sty -- for attribute-value matrices -- mar 29, 1992; rev. dec 6, 1993
% (c) 1992 christopher manning (manning@csli.stanford.edu) -- see avm.doc.tex
\newif\ifavmactive\newif\ifavmsorted\newif\ifavmlabeled
\newif\ifavmcenter\newif\ifavmbottom
\newif\ifavmbottomright\newif\ifavmtopleft\newif\ifavmtopright
\newdimen\avmdimen
\newbox\avmboxone\newbox\avmboxthree
\def\avmoptions#1{\avmactivefalse\avmsortedfalse\avmlabeledfalse
\avmcenterfalse\avmbottomfalse
\avmbottomrightfalse\avmtopleftfalse\avmtoprightfalse
\def\more{#1}\ifx\more\empty\else\avmjoptions#1,\@nil\fi}
\def\avmjoptions#1,#2\@nil{\def\more{#2}\csname avm#1true\endcsname
\ifx\more\empty\else\avmjoptions#2\@nil\fi}
\def\avmfont#1{\def\avmjfont{#1}}
\def\avmjfont{}
\def\avmvalfont#1{\def\avmjvalfont{#1}}
\def\avmjvalfont{}
\def\avmsortfont#1{\def\avmjsortfont{#1}}
\def\avmjsortfont{}
\def\avmhskip#1{\def\avmjhskip{#1}}
\def\avmjhskip{1em}
\def\avmbskip#1{\def\avmjbskip{#1}}
\def\avmjbskip{0em}
\def\avmvskip#1{\def\avmjvskip{#1}}
\def\avmjvskip{0.385ex}%was .3875
\def\avmjprolog#1{$\mskip-\thinmuskip
\left#1\hskip\avmjbskip\vcenter\bgroup\vskip\avmjvskip
\ialign\bgroup\avmjfont
\strut ##\unskip\hfil
&&\hskip\avmjhskip\avmjvalfont ##\unskip\hfil\cr}
\def\avmjpostlog#1{\crcr\egroup\vskip\avmjvskip\egroup
\hskip\avmjbskip\right#1\mskip-\thinmuskip$\ignorespaces}
\def\avmjcatcode{\let\lparen=(\let\rparen=)\catcode`\[=13\catcode`\]=13
\catcode`\<=13\catcode`\@=13\catcode`\(=13\catcode`\)=13
\catcode`\>=13\catcode`\|=13}
{\avmjcatcode % new group: redefine above catcodes as active
\gdef\specialavm{\avmjcatcode
\def({\avmjprolog\lparen}%
\def){\avmjpostlog\rparen}%
\def<{\avmjprolog\langle}%
\def>{\avmjpostlog\rangle}%
\ifavmsorted
\def[##1{\setbox\avmboxthree=\hbox{\avmjsortfont##1\/}\setbox2=\hbox
\bgroup\avmjprolog\lbrack}%
\def]{\avmjpostlog\rbrack\egroup\avmjsort}%
\else\ifavmlabeled
\def[##1{\def\more{##1}\setbox2=\hbox\bgroup\avmjprolog[}%
\def]{\avmjpostlog]\egroup\node{\more}{\box2}}%
\else
\def[{\avmjprolog\lbrack}%
\def]{\avmjpostlog\rbrack}%
\fi\fi
%
\def\<{$\langle$}\def\>{$\rangle$}%
\def\({\lparen}\def\){\rparen}%
\def\[{\lbrack}\def\]{\rbrack}%
\def|{$\,\vert\,$}%
\def@##1{\avmbox{##1}}%
} % end defn of \specialavm
} % restore active catcodes
\long\def\avm{\begingroup
\ifavmactive\specialavm
\else
\def\({\avmjprolog(}%
\def\){\avmjpostlog)}%
\def\<{\avmjprolog\langle}%
\def\>{\avmjpostlog\rangle}%
%
\ifavmsorted
\def\[##1{\setbox\avmboxthree=\hbox{\avmjsortfont##1\/}\setbox
2=\hbox\bgroup\avmjprolog[}%
\def\]{\avmjpostlog]\egroup\avmjsort}%
\else\ifavmlabeled
\def\[##1{\def\more{##1}\setbox2=\hbox\bgroup\avmjprolog[}%
\def\]{\avmjpostlog]\egroup\node{\more}{\box2}}%
\else
\def\[{\avmjprolog[}%
\def\]{\avmjpostlog]}%
\fi\fi
%
\def\|{$\,\vert\,$}%
\def\@##1{\avmbox{##1}}%
\fi % end not active
%
\ifx\LaTeX\undefined\def\\{\cr}% running under TeX
\else \def\\{\@tabularcr}% Leverage off LaTeX's \\*[dimen] options
\fi
\def\!{\node}%
\long\def\avmjsort{\dimen2=\ht2\advance\dimen2 by -.25\baselineskip
\global\dimen\avmdimen=\wd\avmboxthree
\ifavmtopleft \raise\dimen2\llap{\box\avmboxthree}\box2%
\else\ifavmtopright \box2\raise\dimen2\box\avmboxthree%
\else\ifavmbottomright \box2\lower\dimen2\box\avmboxthree%
\else \lower\dimen2\llap{\box\avmboxthree}\box2%
\fi\fi\fi}%
\long\def\sort##1##2{\setbox2=\hbox{##2}\setbox
\avmboxthree=\hbox{\avmjsortfont##1\/}\dimen2=\ht2
\advance\dimen2 by -.25\baselineskip
\ifavmtopleft \raise\dimen2\box\avmboxthree\box2%
\else\ifavmtopright \box2\raise\dimen2\box\avmboxthree%
\else\ifavmbottomright \box2\lower\dimen2\box\avmboxthree%
\else \lower\dimen2\box\avmboxthree\box2%
\fi\fi\fi}%
\long\def\osort##1##2{\setbox2=\hbox{##2}\setbox
\avmboxthree=\hbox{\avmjsortfont ##1\/}\avmjsort}%
\def\avml{\avmjprolog.}%
\def\avmr{\avmjpostlog.}%
\def\avmb##1{\node{##1}{\lbrack\;\rbrack}}%
\def\avmd##1{\node{##1}{---}}%
\def\q##1{\ifx ##1\{$\lbrace$\else
\ifx ##1\}$\rbrace$\else
\ifx ##1<$\langle$\else
\ifx ##1>$\rangle$\fi \fi \fi \fi}%
\def\{{\avmjprolog\lbrace}%
\def\}{\avmjpostlog\rbrace}%
\def\;{\hskip\avmjhskip}%
\def\avmspan##1{\multispan2\strut ##1\expandafter\hfil}%
\avmjfont
\openup\avmjvskip
\setbox\avmboxone=\hbox\bgroup\ignorespaces
} % end defn of \avm
\def\endavm{\egroup\ifvmode\leavevmode\fi % this if is useful!
\ifavmsorted\null\hskip\dimen\avmdimen\fi
\ifavmcenter
\box\avmboxone
\else \ifavmbottom
\lower.575\baselineskip\hbox{\vbox{\box\avmboxone\null}}%
\else
% the next bit is ripped off from Emma's \evnup in lingmacros.sty
\dimen2=\ht\avmboxone\advance\dimen2 by -.725\baselineskip
\lower\dimen2\box\avmboxone
\fi \fi \endgroup}
% based on TeXbook exercise 21.3
\def\avmbox#1{\setbox2=\hbox{$\scriptstyle #1$}\lower.2ex\vbox{\hrule
\hbox{\vrule\kern1.25pt
\vbox{\kern1.25pt\box2\kern1.25pt}\kern1.25pt\vrule}\hrule}}
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