Yaml.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\Yaml;

use Symfony\Component\Yaml\Exception\ParseException;

/**
 * Yaml offers convenience methods to load and dump YAML.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class Yaml {
  public static $enablePhpParsing = false;
  public static function enablePhpParsing() {
    self::$enablePhpParsing = true;
  }

  /**
   * Parses YAML into a PHP array.
   *
   * The parse method, when supplied with a YAML stream (string or file),
   * will do its best to convert YAML in a file into a PHP array.
   *
   *  Usage:
   *  <code>
   *   $array = Yaml::parse('config.yml');
   *   print_r($array);
   *  </code>
   *
   * @param string $input Path to a YAML file or a string containing YAML
   *
   * @return array The YAML converted to a PHP array
   *
   * @throws ParseException If the YAML is not valid
   *
   * @api
   */
  public static function parse($input) {

    // if input is a file, process it
    $file = '';
    if (strpos($input, "\n") === false && is_file($input)) {
      if (false === is_readable($input)) {
        throw new ParseException(sprintf('Unable to parse "%s" as the file is not readable.', $input));
      }
      $file = $input;
      if (self::$enablePhpParsing) {
        ob_start();
        $retval = (include $file);
        $content = ob_get_clean();

        // if an array is returned by the config file assume it's in plain php form else in YAML
        $input = is_array($retval) ? $retval : $content;

        // if an array is returned by the config file assume it's in plain php form else in YAML
        if (is_array($input)) {
          return $input;
        }
      }
      else {
        $input = file_get_contents($file);
      }
    }
    $yaml = new Parser();
    try {
      return $yaml
        ->parse($input);
    } catch (ParseException $e) {
      if ($file) {
        $e
          ->setParsedFile($file);
      }
      throw $e;
    }
  }

  /**
   * Dumps a PHP array to a YAML string.
   *
   * The dump method, when supplied with an array, will do its best
   * to convert the array into friendly YAML.
   *
   * @param array   $array  PHP array
   * @param integer $inline The level where you switch to inline YAML
   * @param integer $indent The amount of spaces to use for indentation of nested nodes.
   *
   * @return string A YAML string representing the original PHP array
   *
   * @api
   */
  public static function dump($array, $inline = 2, $indent = 4) {
    $yaml = new Dumper();
    $yaml
      ->setIndentation($indent);
    return $yaml
      ->dump($array, $inline);
  }

}