<?php

/**
 * @file
 * Contains FeedsSyndicationParser and related classes.
 */

/**
 * Class definition for Common Syndication Parser.
 *
 * Parses RSS and Atom feeds.
 */
class FeedsSyndicationParser extends FeedsParser {

  /**
   * Implements FeedsParser::parse().
   */
  public function parse(FeedsSource $source, FeedsFetcherResult $fetcher_result) {
    feeds_include_library('common_syndication_parser.inc', 'common_syndication_parser');
    $feed = common_syndication_parser_parse($fetcher_result->getRaw());
    $result = new FeedsParserResult();

    // Return an empty result object when feed is false.
    if (!$feed) {
      return $result;
    }

    $result->title = $feed['title'];
    $result->description = $feed['description'];
    $result->link = $feed['link'];
    if (is_array($feed['items'])) {
      foreach ($feed['items'] as $item) {
        if (isset($item['geolocations'])) {
          foreach ($item['geolocations'] as $k => $v) {
            $item['geolocations'][$k] = new FeedsGeoTermElement($v);
          }
        }
        $result->items[] = $item;
      }
    }
    return $result;
  }

  /**
   * Return mapping sources.
   *
   * At a future point, we could expose data type information here,
   * storage systems like Data module could use this information to store
   * parsed data automatically in fields with a correct field type.
   */
  public function getMappingSources() {
    return array(
      'title' => array(
        'name' => t('Title'),
        'description' => t('Title of the feed item.'),
      ),
      'description' => array(
        'name' => t('Description'),
        'description' => t('Description of the feed item.'),
      ),
      'author_name' => array(
        'name' => t('Author name'),
        'description' => t('Name of the feed item\'s author.'),
      ),
      'timestamp' => array(
        'name' => t('Published date'),
        'description' => t('Published date as UNIX time GMT of the feed item.'),
      ),
      'url' => array(
        'name' => t('Item URL (link)'),
        'description' => t('URL of the feed item.'),
      ),
      'guid' => array(
        'name' => t('Item GUID'),
        'description' => t('Global Unique Identifier of the feed item.'),
      ),
      'tags' => array(
        'name' => t('Categories'),
        'description' => t('An array of categories that have been assigned to the feed item.'),
      ),
      'geolocations' => array(
        'name' => t('Geo Locations'),
        'description' => t('An array of geographic locations with a name and a position.'),
      ),
      'source:url' => array(
        'name' => t('Source: URL'),
        'description' => t('The URL of the RSS channel that the item came from.'),
      ),
      'source:title' => array(
        'name' => t('Source: Title'),
        'description' => t('The title of the RSS channel that the item came from.'),
      ),
    ) + parent::getMappingSources();
  }

  /**
   * Overrides FeedsParser::providesSourceTitle().
   *
   * This parser supports retrieving a title from the source.
   */
  public function providesSourceTitle() {
    return TRUE;
  }

}
