php/sgf.php

   1 <?php
   2
   3 // Quick and dirty SGF parser.
   4
   5 class SGF {
   6         var $sgf, $index, $root;
   7         function SGF($sgf) {
   8                 $this->sgf = $sgf;
   9                 $this->index = 0;
  10                 $this->tree = $this->parseTree(null);
  11         }
  12         function parseTree($parent) {
  13                 $tree = array();
  14                 $tree['nodes'] = array();
  15                 $tree['trees'] = array();
  16                 while ($this->index < strlen($this->sgf)) {
  17                         $char = $this->sgf[$this->index];
  18                         $this->index++;
  19                         switch ($char) {
  20                                 case ';':
  21                                         $node = $this->parseNode();
  22                                         //if (is_null($tree['nodes'])) $tree['nodes'] = array();
  23                                         array_push($tree['nodes'], $node);
  24                                         break;
  25                                 case '(':
  26                                         //if (is_null($tree['trees'])) $tree['trees'] = array();
  27                                         array_push($tree['trees'], $this->parseTree($tree));
  28                                         break;
  29                                 case ')':
  30                                         return $tree;
  31                                         break;
  32                         }
  33                 }
  34                 return $tree;
  35         }
  36         function parseNode() {
  37                 $node = array();
  38                 $key = "";
  39                 $values = array();
  40                 $i = 0;
  41                 while ($this->index < strlen($this->sgf)) {
  42                         $char = $this->sgf[$this->index];
  43                         if ($char == ';' || $char == '(' || $char == ')')
  44                                 break;
  45                         if ($char == '[') {
  46                                 while ($this->sgf[$this->index] == '[') {
  47                                         $this->index++;
  48                                         while ($this->sgf[$this->index] != ']' && $this->index < strlen($this->sgf)) {
  49                                                 if ($this->sgf[$this->index] == '\\')
  50                                                         $this->index++;
  51                                                 $values[$i] .= $this->sgf[$this->index];
  52                                                 $this->index++;
  53                                         }
  54                                         $i++;
  55                                         while ($this->sgf[$this->index] == ']' || $this->sgf[$this->index] == '\r' || $this->sgf[$this->index] == 'n')
  56                                                 $this->index++;
  57                                 }
  58                                 $node[$key] = count($values) > 1 ? $values : $values[0];
  59                                 $key = "";
  60                                 $values = array();
  61                                 $i = 0;
  62                                 continue;
  63                         }
  64                         if ($char != " " && $char != "\n" && $char != "\r" && $char != "\t")
  65                                 $key .= $char;
  66                         $this->index++;
  67                 }
  68                 return $node;
  69         }
  70 }
  71
  72 ?>