trekel / src / php / Trekel / Evaluator.php

<?php


class Trekel_Evaluator {

  public function setParseTree ($tree) {
    $this->tree = $tree;
  }

  public function setRootNode ($root) {
    $this->root = new Trekel_Root($root);
  }

  public function evaluate () {
    return $this->reduce();
  }

  private function reduce () {
    $matches = new Trekel_List();
    $matches->append($this->root);
    $node = $this->tree;
    do {
      $staging = new Trekel_List();
      foreach ($matches as $idx => $match) {
        $staging->appendAll($node->reduce($match, $idx));
      }
      $matches = $staging;
    } while (null !== ($node = $node->getChild()));
    $matches->remove($this->root);
    return $matches->getItems();
  }

} // end Trekel_Evaluator
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