<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% Author: Anthony Bloesch
% Title: tree.sty
%
% Copyright (C) Anthony Bloesch 1993
%
% Version: 1.0
%
% Purpose: Allow the automatic layout of n-ary trees with arbitrary node
%          sizes in LaTeX.
%
% Usage: \begin{tree}[ROOT_POSITION]{TREE_NAME}
%           \rootnode{ ... }
%           \treenode{NODE_NAME1}{PARENT_1}{ ... }
%              .
%              .
%              .
%        \end{tree}
%
%        To layout a tree:
%          1. Describe the tree in a tree environment.
%          2. Run LaTeX on the file.
%          3. Run treetex on the generated .tlo file to generate a .tli file.
%          4. Run LaTeX again.
%          5. If the tree is ever changed repeat steps 3 and 4.
%
%        Example:
%          \begin{tree}{testtreea}
%            \rootnode{root node}
%            \treenode{nodeA}{root}{left root child}
%            \treenode{nodeB}{root}{right root child}
%            \treenode{nodeC}{nodeA}{nodeA child}
%          \end{tree}
%
%        The argument of the environment (e.g. "testtreea") gives the
%        name of the file to be generated.  Each tree must have
%        exactly one root node which is defined with the \rootnode
%        macro; its argument is the contents of the node.  All other
%        nodes are defined with the \treenode macro.  The first
%        argument of \treenode is its name (consisting only of
%        alphabetical characters); the second is its parent's name;
%        and the third is its contents.
%
%        The tree environment has an optional environment describing
%        where the root of the tree should go relative to the tree.
%        If the parameter is `t' (the default) then the root goes at the
%        top of the tree with branches hanging down from it;
%        otherwise the parameter must be a `l' and the root goes at
%        the left of the tree with the branches spreading to the right.
%
%        Example:
%          \begin{tree}[l]{testtreea}
%            \rootnode{root node}
%            \treenode{nodeA}{root}{left root child}
%            \treenode{nodeB}{root}{right root child}
%            \treenode{nodeC}{nodeA}{nodeA child}
%          \end{tree}
%
%        Children of a node will be layed out, left to right, in the
%        same order as they appear in the tree environment.
%
%        The tree environment will generate a warning when the .tli
%        file has not been generated and inconsistencies between the
%        .tlo and .tli files are detected.
%
%        The minimum seperation between nodes in the x and y
%        directions can be changed setting the lengths
%        \treexseparation and \treeyseparation.

\newlength\treexseparation
\treexseparation 10pt
\newlength\treeyseparation
\treeyseparation 10pt

\newwrite\@tlo

\def\tree{\@ifnextchar[{\@xtree}{\@xtree[t]}}
\def\@xtree[#1]#2{\bgroup
  \def\@treename{#2}
  \immediate\openout\@tlo=\@treename.tlo
  \immediate\write\@tlo{#1}
  \immediate\write\@tlo{\the\treexseparation\space\the\treeyseparation}
  \def\@printwdhtdp##1{
     \setbox\@tempboxa\hbox{##1}
     \edef\tempa{\immediate\write\@tlo{\space\space\the\wd\@tempboxa\space
                 \the\ht\@tempboxa\space\the\dp\@tempboxa}}
     \tempa
     \relax}
  \def\rootnode##1{
     \def\root{##1}
     \immediate\write\@tlo{root }\@printwdhtdp{##1}}
  \def\treenode##1##2##3{
     \expandafter\def\csname ##1\endcsname{##3}
     \immediate\write\@tlo{##1 ##2 }\@printwdhtdp{##3}}
}

\def\endtree{
  \immediate\closeout\@tlo
  \def\shownode##1{\edef\@tempa{\expandafter\@cdr\string ##1\@nil}%
                   \@ifundefined{\@tempa}{\@warning{Run treetex on \@treename}}{##1}}
  \openin1=\@treename.tli
  \ifeof1
    \@warning{Run treetex on \@treename}
    \fbox{\fbox{Run treetex on \@treename.}}
  \else
    \closein1 \relax\@@input\@treename.tli
  \fi
  \egroup}
</pre></body></html>