Added fancy tree representation

parser.php

@@ -134,20 +134,23 @@ class ElementInstance {
  }
  }
 
- public function printTree($indent=0) {
+ public function printTree($indentStr='', $isLastChild=false) {
  static $stack_depth = 0; global $STACK_LIMIT;
  if (++$stack_depth > $STACK_LIMIT) {
  throw new RuntimeException('Stack limit exceeded.');
  }
  try {
  if ($this->definition() !== null) {
- echo str_repeat(' ', $indent) . $this->definition()->name() . "\n";
+ echo $indentStr . '+-' . $this->definition()->name() . "\n";
  }
+ $extraIndentStr = ($isLastChild ? ' ' : '| ');
+ $argIdx = 0;
  foreach ($this->args() as $arg) {
+ ++$argIdx;
  if ($arg instanceof TokenInstance) {
- echo str_repeat(' ', $indent + 1) . $arg;
+ echo $indentStr . $extraIndentStr . '+-' . $arg;
  } else {
- $arg->printTree($indent + 1);
+ $arg->printTree($indentStr . $extraIndentStr, $argIdx == count($this->args()));
  }
  }
  } finally {