%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Version: 28 Dec 2005
%%                                                     changelog at end
%%
%%     Primitive Linguistics Tree Formatter
%%
%% Copyright (c) 1991, 2005, 2006 Avery DeLano Andrews 3rd
%% These macros can be redistributed and/or modified under the terms
%% of the LaTeX Project Public License Distributed from CTAN
%% archives in directory macros/latex/base/lppl.txt.
%%
%%      Parameter-list handling technique cribbed from gloss.sty
%%         by Marcel R. van der Goot (1990).
%%      Advice and some edits by Christopher D Manning
%%
%% License: LaTeX Project Public License
%%
%% Usage:  \tree{...}      prints out a formatted tree.
%%         \treenode{...}  puts formatted tree into \treebox reg.
%%            either leaves \treewidth reg = width of tree
%%                          \treecenter reg. = `center' of tree
%%
%%         {...} above is a `tree list', of the form:
%%           {{<terminal>}}
%%           {<mother>, <d1>,  <dn>}, where each di is a treelist.
%%            
%%         e.g.  {S, {NP, {Det, {{the}}, {N, {{dog}}}}, {VP, {{barked}}}}
%%
%%         The double braces around terminals are annoying, but I haven't
%%          been clever enough to avoid them.  <terminal> & <mother>
%%          can be any well-balanced material, (feature-structures,
%%          stacks of nodes & annotations ...
%%
%%  Parameters:
%%    \sisterskip (dimen)     default spacing between sisters
%%    \daughterskip (dimen)   default vert. mother-daughter spacing
%%
%%  Fiddles:
%%    \daughtergap{<dimen>} in a mother node sets mother-daughter
%%       spacing to <dimen> for daughters of that node.
%%    \sistergap{<dimen>} in a node spaces it <dimen> horizontally
%%       from its *preceeding* sister
%%
%%  LFG Specials:
%%    To make life easier for LFG people, there are two commands for
%%    doing annotated nodes, \tnode for terminals, \ntnode for nonterminals.
%%    Both are defined in terms of \node from Emma Pease's tree.sty, so they
%%    take two braced arguments, the node tag and the node specification.
%%
%%    The node tag is as in tree.sty, but the node specification is a
%%    series of levels separated by `/' (if you want to combine levels
%%    with GPSG slash notation, groupany level containing a slash in
%%    braces).  With \ntnode, the upper levels are set in math mode
%%    and the bottommost in restricted horizontal; with \tnode, the
%%    upper levels are set in math mode and the bottommost in restricted
%%    horizontal with italic font.
%%
%%    Annotation are now by default in the current mode (usually text).
%%    If you want to switch on automatic math mode for annotations, you
%%    can do it by redefining the \nodeannotation command as follows:
%%
%%      \def\nodeannotation#1{$#1$}
%%
%%   If you want to terminals to be, say slanted rather than italics, you can
%%   do it by redefining \tstyle as follows:
%%   
%%      \def\tstyle{\sl}
%%
%%  If you want to use the stacking, etc., facilities, but not the
%%  line-drawing (which depends on tree.sty), you can redefine \node
%%  to effectively do nothing:
%%
%%      \def\node#1#2{#2}
%%
%%
%%  General Remarks:
%%
%%    Coded for reader's comfort, not computer's speed, according
%%    to my rather inexperienced lights.
%%
%%    Processes nodes on a left-corner schedule, first packing
%%    daughters into an hbox, then mother into another hbox,
%%    then both into a vtop (vbox with alignment along the top).
%%
%%    Improvements & Suggestions welcome.  Please notify to:
%%
%%      Avery D Andrews
%%      School of Language Studies
%%      Faculty of Arts
%%      The Australian national University
%%      Acton ACT 2600
%%
%%      email:  Avery.Andrews@anu.edu.au
%%
%%    Changelog:
%%      27 Dec 2005: \nodeannotation bugfixed
%%                   \sistergap bug fixed
%%
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\csname LingTreesLoaded\endcsname
\let\LingTreesLoaded\endinput

\ifx\LingTreesWithoutPSTricks\relax\input tree-dvips.sty\else
\ifx\PSTTreeDvipsEmuLoaded\endinput\else\input pst-tree-dvips-emu.sty\fi\relax\fi\relax

\def\CR{
}
{
\catcode`\_=11     % sets underbar to letter
\catcode` =9       % causes spaces to be ignored
\catcode`\^^M=9    % causes <CR> to be ignored

\newbox\treebox        % box register for returned tree
\newbox\mother_box     %     " for mother
\newbox\daughter_box   %     " for local accumulation of daughters
\newbox\daughterr_box  %     " for upward comm. of dtrs
\newbox\stack_box      % for calculating widths for centering annotations

\newskip\sisterskip     % default space between sisters
\newskip\sister_skip    % space before current sister
\newdimen\daughterskip  % default mother-daughter space (vert)
\newdimen\daughter_skip % current  "
\newdimen\stack_width   % for calculating widths for centering annotations
\newskip\annoteskip     % default space between annotations

\global\sisterskip=2em
\global\daughterskip=2ex
\global\annoteskip=0ex

\newdimen\treewidth
\newdimen\treecenter
\newdimen\mother_offset
\newdimen\first_center
\newdimen\last_center
\newdimen\daughter_center
\newdimen\raise_daughter


\newdimen\daughter_spread
\newcount\daughter_count
\newcount\treerationum
\newcount\treeratiodenom
\global\treerationum=0
\global\treeratiodenom=0
\gdef\treeslantratio#1{\@treeslantratio[#1]}
\gdef\@treeslantratio[#1/#2]{%
\treerationum=#1
\treeratiodenom=#2
}

\newdimen\treedotwidth
\global\treedotwidth=0.6pt

\newdimen\nodewidth
\newdimen\node_width
\global\nodewidth=0em
\gdef\@nwbox#1{\hbox{\makebox[\node_width][c]{#1}}}
\gdef\@ifnodewidthzero#1#2{\ifdim\node_width=0em #1\else #2\fi}
\gdef\@fwbox#1{\@ifnodewidthzero{\hbox{#1}}{\@nwbox{#1}}}

\gdef\setnodewidth#1{\global\node_width=#1}

\gdef\daughtergap#1{\global\daughter_skip=#1} % chris: should remove global?
\gdef\sistergap#1{\global\sister_skip=#1}       % avery: no, doesn't work.  wish I could
                                                %  remember how it was supposed to!

% was: \gdef\tree#1{\tree_node#1,.\leavevmode\box\treebox}
\gdef\tree#1{\tree_node#1,.\ifvmode\leavevmode\fi\hbox{\box\treebox}}
          % formats tree & prints it out.
          % sets treewidth & treecenter

\gdef\treenode#1{\tree_node#1,.}  % formats tree & puts it in treebox
          % sets treewidth & treecenter

\gdef\treeann#1{\node_ann{#1}}          % annotation stack

% for centered tree in math mode. cdm Mar 1996
\gdef\treecent#1{\tree_node#1,.\ifvmode\leavevmode\fi\vcenter{\box\treebox}}

\gdef\tree_node#1,#2.{
   \def\daughters{#2}
   \ifx\daughters\empty   % if terminal
%      \message{terminal\CR}
      \global\setbox\treebox=\@fwbox{#1}
%      \message{got_term}
      \global\treewidth=\wd\treebox
      \global\treecenter=.5\treewidth
   \else
%      \message{get daughters}
      \global\node_width=\nodewidth%\message{RestoreA\CR}
      \get_daughters#2.
%      \message{got daughters}
      \global\node_width=\nodewidth%\message{RestoreB\CR}
      \ifnum\treeratiodenom=0
        \daughtergap{\daughterskip}
      \else
        \ifnum\daughter_count=1
           \daughtergap{\daughterskip}
         \else
           \daughter_spread=\last_center
           \advance \daughter_spread by -\first_center
           \multiply \daughter_spread by \treerationum
           \divide\daughter_spread by \treeratiodenom
           \daughtergap{\daughter_spread}
         \fi
      \fi
      \setbox\mother_box=\@fwbox{#1}
%      \message{got mother\CR}
      \ifdim\ht\mother_box=0em
         \advance\daughter_skip by -2\nodemargin
      \fi
      \mother_offset=\daughter_center
      \advance\mother_offset by -.5\wd\mother_box  % width to center of mother
      \ifdim\mother_offset>0pt
           \global\setbox\treebox=\vtop{
                    \hbox{\hskip\mother_offset\unhbox\mother_box}
                    \vskip\daughter_skip
                    \box\daughterr_box}
      \else
           \global\setbox\treebox=\vtop{
                    \box\mother_box
                    \vskip\daughter_skip
                    \hbox{\hskip-\mother_offset\unhbox\daughterr_box}}
      \fi
      \@ifnodewidthzero
        {\global\treewidth=\wd\treebox}
        {\global\treewidth=\node_width}
      \global\treecenter=\daughter_center
      \ifdim\mother_offset<0pt
        \global\advance\treecenter by -\mother_offset
      \fi
%      \global\node_width=\nodewidth\message{Restore\CR}
   \fi
}

\gdef\d@mmy.{}  % We call this when we are at the end.  A no-op, but you
    % get better performance if you use no-ops! [cdm]

\gdef\d@@mmy.{}{} % two-argument version.

\gdef\get_daughters#1,#2.{
%   \global\node_width=\nodewidth\message{PreRestore\noexpand\node_width\CR}
   {\treenode#1}     %  process first daughter
%   \message{got first daughter\CR}
   \first_center=\treecenter
   \last_center=\treewidth
   \daughter_count=1
   \setbox\daughter_box=\hbox{\raise\raise_daughter\box\treebox}
   \def\more{#2}
   \ifx\more\empty
     \global\daughter_center=\first_center
     \global\setbox\daughterr_box=\box\daughter_box
     \let\more=\d@mmy
   \else
     \let\more=\more_daughters
   \fi
   \more#2.
   \@ifnodewidthzero{}
     {\global\setbox\daughterr_box=\@fwbox{\box\daughterr_box}
      \global\daughter_center=.5\node_width
     }
}

\gdef\more_daughters#1,#2.{
   \sistergap{\sisterskip}
   \node_width=\nodewidth
   {\treenode#1}
   \advance\daughter_count by 1
   \@ifnodewidthzero  % leave out sisterskip for fixed width
     {\setbox\daughter_box=\hbox{
        \unhbox\daughter_box\hskip\sister_skip\raise\raise_daughter\box\treebox}}
     {\setbox\daughter_box=\hbox{
        \unhbox\daughter_box\raise\raise_daughter\box\treebox}}
   \def\more{#2}
   \ifx\more\empty
      \advance\last_center by \treecenter
      \@ifnodewidthzero
        {\advance\last_center by \sister_skip}
        {}
      \advance\last_center by \first_center
      \divide\last_center by 2
      \global\daughter_center=\last_center
      \global\setbox\daughterr_box=\box\daughter_box  
      \let\more=\d@mmy
   \else
      \advance\last_center by \treewidth
      \@ifnodewidthzero
        {\advance\last_center by \sister_skip}
        {}
      \let\more=\more_daughters
   \fi
   \more#2.
   \sistergap{\sisterskip}
}


\gdef\ntnode#1#2{
  \def\t_style{\ntstyle}
  \node{#1}{\node_ann{#2}}
}

\global\let\tstyle=\it
\global\let\ntstyle=\rm

\gdef\tnode#1#2{
  \def\t_style{\tstyle}
  \node{#1}{\node_ann{#2}}
}

\gdef\node_ann#1{
  \global\stack_width=0pt
  \get_widths#1/.
  \vtop{\stack_ann#1/.}
}

\gdef\stack_ann#1/#2.{
  \def\more{#2}
  \ifx\more\empty
    \ifdim\stack_width=0em
      \hbox to\stack_width{\vbox to 0em{}}
      \global\raise_daughter=\ht\strutbox
    \else
      \hbox to \stack_width{\strut\hss\t_style {\nodeannotation{#1}}\hss}
      \global\raise_daughter=0ex
    \fi
    \let\more=\d@mmy
  \else
    \hbox to \stack_width{\hss {\nodeannotation{#1}}\hss}\vskip\annoteskip
    \let\more=\stack_ann
  \fi
  \more#2.
 }

% Default used to be math, (for f-descriptions?) but this was a pain!
% \gdef\nodeannotation#1{$#1$}
\gdef\nodeannotation#1{#1}

\gdef\get_widths#1/#2.{
  \def\more{#2}
  \ifx\more\empty
     \setbox\stack_box=\hbox{\t_style \nodeannotation{#1}}
     \let\more=\d@mmy
  \else
     \setbox\stack_box=\hbox{\nodeannotation{#1}}
     \let\more=\get_widths
  \fi
  \ifdim\stack_width<\wd\stack_box
    \global\stack_width=\wd\stack_box
  \fi
  \more#2.
}

}  % end group & restore standard catcodes

%% Changelog
%%
%% 26 Feb 2006
%%  get vertical spacing with no-label nodes to work
%%  \setnodewidth command and ancilliaries working
%%
%% 28 Dec 2005
%%   fix bugs with \nodeannotation and \sistergap
%%
%% 21 Sep 1997