<?php
/**
 * WordPress eXtended RSS file parser implementations
 *
 * @package WordPress
 * @subpackage Importer
 */

/**
 * WordPress Importer class for managing parsing of WXR files.
 */
class WXR_Parser {
  function parse( $file ) {
    // Attempt to use proper XML parsers first
    if ( extension_loaded( 'simplexml' ) ) {
      $parser = new WXR_Parser_SimpleXML;
      $result = $parser->parse( $file );

      // If SimpleXML succeeds or this is an invalid WXR file then return the results
      if ( ! is_wp_error( $result ) || 'SimpleXML_parse_error' != $result->get_error_code() )
        return $result;
    } else if ( extension_loaded( 'xml' ) ) {
      $parser = new WXR_Parser_XML;
      $result = $parser->parse( $file );

      // If XMLParser succeeds or this is an invalid WXR file then return the results
      if ( ! is_wp_error( $result ) || 'XML_parse_error' != $result->get_error_code() )
        return $result;
    }

    // We have a malformed XML file, so display the error and fallthrough to regex
    if ( isset($result) && defined('IMPORT_DEBUG') && IMPORT_DEBUG ) {
      echo '<pre>';
      if ( 'SimpleXML_parse_error' == $result->get_error_code() ) {
        foreach  ( $result->get_error_data() as $error )
          echo $error->line . ':' . $error->column . ' ' . esc_html( $error->message ) . "\n";
      } else if ( 'XML_parse_error' == $result->get_error_code() ) {
        $error = $result->get_error_data();
        echo $error[0] . ':' . $error[1] . ' ' . esc_html( $error[2] );
      }
      echo '</pre>';
      echo '<p><strong>' . __( 'There was an error when reading this WXR file', 'wordpress-importer' ) . '</strong><br />';
      echo __( 'Details are shown above. The importer will now try again with a different parser...', 'wordpress-importer' ) . '</p>';
    }

    // use regular expressions if nothing else available or this is bad XML
    $parser = new WXR_Parser_Regex;
    return $parser->parse( $file );
  }
}

/**
 * WXR Parser that makes use of the SimpleXML PHP extension.
 */
class WXR_Parser_SimpleXML {
  function parse( $file ) {
    $authors = $posts = $categories = $tags = $terms = array();

    $internal_errors = libxml_use_internal_errors(true);

    $dom = new DOMDocument;
    $old_value = null;
    if ( function_exists( 'libxml_disable_entity_loader' ) ) {
      $old_value = libxml_disable_entity_loader( true );
    }
    $success = $dom->loadXML( file_get_contents( $file ) );
    if ( ! is_null( $old_value ) ) {
      libxml_disable_entity_loader( $old_value );
    }

    if ( ! $success || isset( $dom->doctype ) ) {
      return new WP_Error( 'SimpleXML_parse_error', __( 'There was an error when reading this WXR file', 'wordpress-importer' ), libxml_get_errors() );
    }

    $xml = simplexml_import_dom( $dom );
    unset( $dom );

    // halt if loading produces an error
    if ( ! $xml )
      return new WP_Error( 'SimpleXML_parse_error', __( 'There was an error when reading this WXR file', 'wordpress-importer' ), libxml_get_errors() );

    $wxr_version = $xml->xpath('/rss/channel/wp:wxr_version');
    if ( ! $wxr_version )
      return new WP_Error( 'WXR_parse_error', __( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'wordpress-importer' ) );

    $wxr_version = (string) trim( $wxr_version[0] );
    // confirm that we are dealing with the correct file format
    if ( ! preg_match( '/^\d+\.\d+$/', $wxr_version ) )
      return new WP_Error( 'WXR_parse_error', __( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'wordpress-importer' ) );

    $base_url = $xml->xpath('/rss/channel/wp:base_site_url');
    $base_url = (string) trim( $base_url[0] );

    $namespaces = $xml->getDocNamespaces();
    if ( ! isset( $namespaces['wp'] ) )
      $namespaces['wp'] = 'http://wordpress.org/export/1.1/';
    if ( ! isset( $namespaces['excerpt'] ) )
      $namespaces['excerpt'] = 'http://wordpress.org/export/1.1/excerpt/';

    // grab authors
    foreach ( $xml->xpath('/rss/channel/wp:author') as $author_arr ) {
      $a = $author_arr->children( $namespaces['wp'] );
      $login = (string) $a->author_login;
      $authors[$login] = array(
        'author_id' => (int) $a->author_id,
        'author_login' => $login,
        'author_email' => (string) $a->author_email,
        'author_display_name' => (string) $a->author_display_name,
        'author_first_name' => (string) $a->author_first_name,
        'author_last_name' => (string) $a->author_last_name
      );
    }

    // grab cats, tags and terms
    foreach ( $xml->xpath('/rss/channel/wp:category') as $term_arr ) {
      $t = $term_arr->children( $namespaces['wp'] );
      $category = array(
        'term_id' => (int) $t->term_id,
        'category_nicename' => (string) $t->category_nicename,
        'category_parent' => (string) $t->category_parent,
        'cat_name' => (string) $t->cat_name,
        'category_description' => (string) $t->category_description
      );

      foreach ( $t->termmeta as $meta ) {
        $category['termmeta'][] = array(
          'key' => (string) $meta->meta_key,
          'value' => (string) $meta->meta_value
        );
      }

      $categories[] = $category;
    }

    foreach ( $xml->xpath('/rss/channel/wp:tag') as $term_arr ) {
      $t = $term_arr->children( $namespaces['wp'] );
      $tag = array(
        'term_id' => (int) $t->term_id,
        'tag_slug' => (string) $t->tag_slug,
        'tag_name' => (string) $t->tag_name,
        'tag_description' => (string) $t->tag_description
      );

      foreach ( $t->termmeta as $meta ) {
        $tag['termmeta'][] = array(
          'key' => (string) $meta->meta_key,
          'value' => (string) $meta->meta_value
        );
      }

      $tags[] = $tag;
    }

    foreach ( $xml->xpath('/rss/channel/wp:term') as $term_arr ) {
      $t = $term_arr->children( $namespaces['wp'] );
      $term = array(
        'term_id' => (int) $t->term_id,
        'term_taxonomy' => (string) $t->term_taxonomy,
        'slug' => (string) $t->term_slug,
        'term_parent' => (string) $t->term_parent,
        'term_name' => (string) $t->term_name,
        'term_description' => (string) $t->term_description
      );

      foreach ( $t->termmeta as $meta ) {
        $term['termmeta'][] = array(
          'key' => (string) $meta->meta_key,
          'value' => (string) $meta->meta_value
        );
      }

      $terms[] = $term;
    }

    // grab posts
    foreach ( $xml->channel->item as $item ) {
      $post = array(
        'post_title' => (string) $item->title,
        'guid' => (string) $item->guid,
      );

      $dc = $item->children( 'http://purl.org/dc/elements/1.1/' );
      $post['post_author'] = (string) $dc->creator;

      $content = $item->children( 'http://purl.org/rss/1.0/modules/content/' );
      $excerpt = $item->children( $namespaces['excerpt'] );
      $post['post_content'] = (string) $content->encoded;
      $post['post_excerpt'] = (string) $excerpt->encoded;

      $wp = $item->children( $namespaces['wp'] );
      $post['post_id'] = (int) $wp->post_id;
      $post['post_date'] = (string) $wp->post_date;
      $post['post_date_gmt'] = (string) $wp->post_date_gmt;
      $post['comment_status'] = (string) $wp->comment_status;
      $post['ping_status'] = (string) $wp->ping_status;
      $post['post_name'] = (string) $wp->post_name;
      $post['status'] = (string) $wp->status;
      $post['post_parent'] = (int) $wp->post_parent;
      $post['menu_order'] = (int) $wp->menu_order;
      $post['post_type'] = (string) $wp->post_type;
      $post['post_password'] = (string) $wp->post_password;
      $post['is_sticky'] = (int) $wp->is_sticky;

      if ( isset($wp->attachment_url) )
        $post['attachment_url'] = (string) $wp->attachment_url;

      foreach ( $item->category as $c ) {
        $att = $c->attributes();
        if ( isset( $att['nicename'] ) )
          $post['terms'][] = array(
            'name' => (string) $c,
            'slug' => (string) $att['nicename'],
            'domain' => (string) $att['domain']
          );
      }

      foreach ( $wp->postmeta as $meta ) {
        $post['postmeta'][] = array(
          'key' => (string) $meta->meta_key,
          'value' => (string) $meta->meta_value
        );
      }

      foreach ( $wp->comment as $comment ) {
        $meta = array();
        if ( isset( $comment->commentmeta ) ) {
          foreach ( $comment->commentmeta as $m ) {
            $meta[] = array(
              'key' => (string) $m->meta_key,
              'value' => (string) $m->meta_value
            );
          }
        }

        $post['comments'][] = array(
          'comment_id' => (int) $comment->comment_id,
          'comment_author' => (string) $comment->comment_author,
          'comment_author_email' => (string) $comment->comment_author_email,
          'comment_author_IP' => (string) $comment->comment_author_IP,
          'comment_author_url' => (string) $comment->comment_author_url,
          'comment_date' => (string) $comment->comment_date,
          'comment_date_gmt' => (string) $comment->comment_date_gmt,
          'comment_content' => (string) $comment->comment_content,
          'comment_approved' => (string) $comment->comment_approved,
          'comment_type' => (string) $comment->comment_type,
          'comment_parent' => (string) $comment->comment_parent,
          'comment_user_id' => (int) $comment->comment_user_id,
          'commentmeta' => $meta,
        );
      }

      $posts[] = $post;
    }

    return array(
      'authors' => $authors,
      'posts' => $posts,
      'categories' => $categories,
      'tags' => $tags,
      'terms' => $terms,
      'base_url' => $base_url,
      'version' => $wxr_version
    );
  }
}

/**
 * WXR Parser that makes use of the XML Parser PHP extension.
 */
class WXR_Parser_XML {
  var $wp_tags = array(
    'wp:post_id', 'wp:post_date', 'wp:post_date_gmt', 'wp:comment_status', 'wp:ping_status', 'wp:attachment_url',
    'wp:status', 'wp:post_name', 'wp:post_parent', 'wp:menu_order', 'wp:post_type', 'wp:post_password',
    'wp:is_sticky', 'wp:term_id', 'wp:category_nicename', 'wp:category_parent', 'wp:cat_name', 'wp:category_description',
    'wp:tag_slug', 'wp:tag_name', 'wp:tag_description', 'wp:term_taxonomy', 'wp:term_parent',
    'wp:term_name', 'wp:term_description', 'wp:author_id', 'wp:author_login', 'wp:author_email', 'wp:author_display_name',
    'wp:author_first_name', 'wp:author_last_name',
  );
  var $wp_sub_tags = array(
    'wp:comment_id', 'wp:comment_author', 'wp:comment_author_email', 'wp:comment_author_url',
    'wp:comment_author_IP', 'wp:comment_date', 'wp:comment_date_gmt', 'wp:comment_content',
    'wp:comment_approved', 'wp:comment_type', 'wp:comment_parent', 'wp:comment_user_id',
  );

  function parse( $file ) {
    $this->wxr_version = $this->in_post = $this->cdata = $this->data = $this->sub_data = $this->in_tag = $this->in_sub_tag = false;
    $this->authors = $this->posts = $this->term = $this->category = $this->tag = array();

    $xml = xml_parser_create( 'UTF-8' );
    xml_parser_set_option( $xml, XML_OPTION_SKIP_WHITE, 1 );
    xml_parser_set_option( $xml, XML_OPTION_CASE_FOLDING, 0 );
    xml_set_object( $xml, $this );
    xml_set_character_data_handler( $xml, 'cdata' );
    xml_set_element_handler( $xml, 'tag_open', 'tag_close' );

    if ( ! xml_parse( $xml, file_get_contents( $file ), true ) ) {
      $current_line = xml_get_current_line_number( $xml );
      $current_column = xml_get_current_column_number( $xml );
      $error_code = xml_get_error_code( $xml );
      $error_string = xml_error_string( $error_code );
      return new WP_Error( 'XML_parse_error', 'There was an error when reading this WXR file', array( $current_line, $current_column, $error_string ) );
    }
    xml_parser_free( $xml );

    if ( ! preg_match( '/^\d+\.\d+$/', $this->wxr_version ) )
      return new WP_Error( 'WXR_parse_error', __( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'wordpress-importer' ) );

    return array(
      'authors' => $this->authors,
      'posts' => $this->posts,
      'categories' => $this->category,
      'tags' => $this->tag,
      'terms' => $this->term,
      'base_url' => $this->base_url,
      'version' => $this->wxr_version
    );
  }

  function tag_open( $parse, $tag, $attr ) {
    if ( in_array( $tag, $this->wp_tags ) ) {
      $this->in_tag = substr( $tag, 3 );
      return;
    }

    if ( in_array( $tag, $this->wp_sub_tags ) ) {
      $this->in_sub_tag = substr( $tag, 3 );
      return;
    }

    switch ( $tag ) {
      case 'category':
        if ( isset($attr['domain'], $attr['nicename']) ) {
          $this->sub_data['domain'] = $attr['domain'];
          $this->sub_data['slug'] = $attr['nicename'];
        }
        break;
      case 'item': $this->in_post = true;
      case 'title': if ( $this->in_post ) $this->in_tag = 'post_title'; break;
      case 'guid': $this->in_tag = 'guid'; break;
      case 'dc:creator': $this->in_tag = 'post_author'; break;
      case 'content:encoded': $this->in_tag = 'post_content'; break;
      case 'excerpt:encoded': $this->in_tag = 'post_excerpt'; break;

      case 'wp:term_slug': $this->in_tag = 'slug'; break;
      case 'wp:meta_key': $this->in_sub_tag = 'key'; break;
      case 'wp:meta_value': $this->in_sub_tag = 'value'; break;
    }
  }

  function cdata( $parser, $cdata ) {
    if ( ! trim( $cdata ) )
      return;

    if ( false !== $this->in_tag || false !== $this->in_sub_tag ) {
      $this->cdata .= $cdata;
    } else {
      $this->cdata .= trim( $cdata );
    }
  }

  function tag_close( $parser, $tag ) {
    switch ( $tag ) {
      case 'wp:comment':
        unset( $this->sub_data['key'], $this->sub_data['value'] ); // remove meta sub_data
        if ( ! empty( $this->sub_data ) )
          $this->data['comments'][] = $this->sub_data;
        $this->sub_data = false;
        break;
      case 'wp:commentmeta':
        $this->sub_data['commentmeta'][] = array(
          'key' => $this->sub_data['key'],
          'value' => $this->sub_data['value']
        );
        break;
      case 'category':
        if ( ! empty( $this->sub_data ) ) {
          $this->sub_data['name'] = $this->cdata;
          $this->data['terms'][] = $this->sub_data;
        }
        $this->sub_data = false;
        break;
      case 'wp:postmeta':
        if ( ! empty( $this->sub_data ) )
          $this->data['postmeta'][] = $this->sub_data;
        $this->sub_data = false;
        break;
      case 'item':
        $this->posts[] = $this->data;
        $this->data = false;
        break;
      case 'wp:category':
      case 'wp:tag':
      case 'wp:term':
        $n = substr( $tag, 3 );
        array_push( $this->$n, $this->data );
        $this->data = false;
        break;
      case 'wp:author':
        if ( ! empty($this->data['author_login']) )
          $this->authors[$this->data['author_login']] = $this->data;
        $this->data = false;
        break;
      case 'wp:base_site_url':
        $this->base_url = $this->cdata;
        break;
      case 'wp:wxr_version':
        $this->wxr_version = $this->cdata;
        break;

      default:
        if ( $this->in_sub_tag ) {
          $this->sub_data[$this->in_sub_tag] = ! empty( $this->cdata ) ? $this->cdata : '';
          $this->in_sub_tag = false;
        } else if ( $this->in_tag ) {
          $this->data[$this->in_tag] = ! empty( $this->cdata ) ? $this->cdata : '';
          $this->in_tag = false;
        }
    }

    $this->cdata = false;
  }
}

/**
 * WXR Parser that uses regular expressions. Fallback for installs without an XML parser.
 */
class WXR_Parser_Regex {
  var $authors = array();
  var $posts = array();
  var $categories = array();
  var $tags = array();
  var $terms = array();
  var $base_url = '';

  function __construct() {
    $this->has_gzip = is_callable( 'gzopen' );
  }

  function parse( $file ) {
    $wxr_version = $in_post = false;

    $fp = $this->fopen( $file, 'r' );
    if ( $fp ) {
      while ( ! $this->feof( $fp ) ) {
        $importline = rtrim( $this->fgets( $fp ) );

        if ( ! $wxr_version && preg_match( '|<wp:wxr_version>(\d+\.\d+)</wp:wxr_version>|', $importline, $version ) )
          $wxr_version = $version[1];

        if ( false !== strpos( $importline, '<wp:base_site_url>' ) ) {
          preg_match( '|<wp:base_site_url>(.*?)</wp:base_site_url>|is', $importline, $url );
          $this->base_url = $url[1];
          continue;
        }
        if ( false !== strpos( $importline, '<wp:category>' ) ) {
          preg_match( '|<wp:category>(.*?)</wp:category>|is', $importline, $category );
          $this->categories[] = $this->process_category( $category[1] );
          continue;
        }
        if ( false !== strpos( $importline, '<wp:tag>' ) ) {
          preg_match( '|<wp:tag>(.*?)</wp:tag>|is', $importline, $tag );
          $this->tags[] = $this->process_tag( $tag[1] );
          continue;
        }
        if ( false !== strpos( $importline, '<wp:term>' ) ) {
          preg_match( '|<wp:term>(.*?)</wp:term>|is', $importline, $term );
          $this->terms[] = $this->process_term( $term[1] );
          continue;
        }
        if ( false !== strpos( $importline, '<wp:author>' ) ) {
          preg_match( '|<wp:author>(.*?)</wp:author>|is', $importline, $author );
          $a = $this->process_author( $author[1] );
          $this->authors[$a['author_login']] = $a;
          continue;
        }
        if ( false !== strpos( $importline, '<item>' ) ) {
          $post = '';
          $in_post = true;
          continue;
        }
        if ( false !== strpos( $importline, '</item>' ) ) {
          $in_post = false;
          $this->posts[] = $this->process_post( $post );
          continue;
        }
        if ( $in_post ) {
          $post .= $importline . "\n";
        }
      }

      $this->fclose($fp);
    }

    if ( ! $wxr_version )
      return new WP_Error( 'WXR_parse_error', __( 'This does not appear to be a WXR file, missing/invalid WXR version number', 'wordpress-importer' ) );

    return array(
      'authors' => $this->authors,
      'posts' => $this->posts,
      'categories' => $this->categories,
      'tags' => $this->tags,
      'terms' => $this->terms,
      'base_url' => $this->base_url,
      'version' => $wxr_version
    );
  }

  function get_tag( $string, $tag ) {
    preg_match( "|<$tag.*?>(.*?)</$tag>|is", $string, $return );
    if ( isset( $return[1] ) ) {
      if ( substr( $return[1], 0, 9 ) == '<![CDATA[' ) {
        if ( strpos( $return[1], ']]]]><![CDATA[>' ) !== false ) {
          preg_match_all( '|<!\[CDATA\[(.*?)\]\]>|s', $return[1], $matches );
          $return = '';
          foreach( $matches[1] as $match )
            $return .= $match;
        } else {
          $return = preg_replace( '|^<!\[CDATA\[(.*)\]\]>$|s', '$1', $return[1] );
        }
      } else {
        $return = $return[1];
      }
    } else {
      $return = '';
    }
    return $return;
  }

  function process_category( $c ) {
    return array(
      'term_id' => $this->get_tag( $c, 'wp:term_id' ),
      'cat_name' => $this->get_tag( $c, 'wp:cat_name' ),
      'category_nicename' => $this->get_tag( $c, 'wp:category_nicename' ),
      'category_parent' => $this->get_tag( $c, 'wp:category_parent' ),
      'category_description' => $this->get_tag( $c, 'wp:category_description' ),
    );
  }

  function process_tag( $t ) {
    return array(
      'term_id' => $this->get_tag( $t, 'wp:term_id' ),
      'tag_name' => $this->get_tag( $t, 'wp:tag_name' ),
      'tag_slug' => $this->get_tag( $t, 'wp:tag_slug' ),
      'tag_description' => $this->get_tag( $t, 'wp:tag_description' ),
    );
  }

  function process_term( $t ) {
    return array(
      'term_id' => $this->get_tag( $t, 'wp:term_id' ),
      'term_taxonomy' => $this->get_tag( $t, 'wp:term_taxonomy' ),
      'slug' => $this->get_tag( $t, 'wp:term_slug' ),
      'term_parent' => $this->get_tag( $t, 'wp:term_parent' ),
      'term_name' => $this->get_tag( $t, 'wp:term_name' ),
      'term_description' => $this->get_tag( $t, 'wp:term_description' ),
    );
  }

  function process_author( $a ) {
    return array(
      'author_id' => $this->get_tag( $a, 'wp:author_id' ),
      'author_login' => $this->get_tag( $a, 'wp:author_login' ),
      'author_email' => $this->get_tag( $a, 'wp:author_email' ),
      'author_display_name' => $this->get_tag( $a, 'wp:author_display_name' ),
      'author_first_name' => $this->get_tag( $a, 'wp:author_first_name' ),
      'author_last_name' => $this->get_tag( $a, 'wp:author_last_name' ),
    );
  }

  function process_post( $post ) {
    $post_id        = $this->get_tag( $post, 'wp:post_id' );
    $post_title     = $this->get_tag( $post, 'title' );
    $post_date      = $this->get_tag( $post, 'wp:post_date' );
    $post_date_gmt  = $this->get_tag( $post, 'wp:post_date_gmt' );
    $comment_status = $this->get_tag( $post, 'wp:comment_status' );
    $ping_status    = $this->get_tag( $post, 'wp:ping_status' );
    $status         = $this->get_tag( $post, 'wp:status' );
    $post_name      = $this->get_tag( $post, 'wp:post_name' );
    $post_parent    = $this->get_tag( $post, 'wp:post_parent' );
    $menu_order     = $this->get_tag( $post, 'wp:menu_order' );
    $post_type      = $this->get_tag( $post, 'wp:post_type' );
    $post_password  = $this->get_tag( $post, 'wp:post_password' );
    $is_sticky      = $this->get_tag( $post, 'wp:is_sticky' );
    $guid           = $this->get_tag( $post, 'guid' );
    $post_author    = $this->get_tag( $post, 'dc:creator' );

    $post_excerpt = $this->get_tag( $post, 'excerpt:encoded' );
    $post_excerpt = preg_replace_callback( '|<(/?[A-Z]+)|', array( &$this, '_normalize_tag' ), $post_excerpt );
    $post_excerpt = str_replace( '<br>', '<br />', $post_excerpt );
    $post_excerpt = str_replace( '<hr>', '<hr />', $post_excerpt );

    $post_content = $this->get_tag( $post, 'content:encoded' );
    $post_content = preg_replace_callback( '|<(/?[A-Z]+)|', array( &$this, '_normalize_tag' ), $post_content );
    $post_content = str_replace( '<br>', '<br />', $post_content );
    $post_content = str_replace( '<hr>', '<hr />', $post_content );

    $postdata = compact( 'post_id', 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_excerpt',
      'post_title', 'status', 'post_name', 'comment_status', 'ping_status', 'guid', 'post_parent',
      'menu_order', 'post_type', 'post_password', 'is_sticky'
    );

    $attachment_url = $this->get_tag( $post, 'wp:attachment_url' );
    if ( $attachment_url )
      $postdata['attachment_url'] = $attachment_url;

    preg_match_all( '|<category domain="([^"]+?)" nicename="([^"]+?)">(.+?)</category>|is', $post, $terms, PREG_SET_ORDER );
    foreach ( $terms as $t ) {
      $post_terms[] = array(
        'slug' => $t[2],
        'domain' => $t[1],
        'name' => str_replace( array( '<![CDATA[', ']]>' ), '', $t[3] ),
      );
    }
    if ( ! empty( $post_terms ) ) $postdata['terms'] = $post_terms;

    preg_match_all( '|<wp:comment>(.+?)</wp:comment>|is', $post, $comments );
    $comments = $comments[1];
    if ( $comments ) {
      foreach ( $comments as $comment ) {
        preg_match_all( '|<wp:commentmeta>(.+?)</wp:commentmeta>|is', $comment, $commentmeta );
        $commentmeta = $commentmeta[1];
        $c_meta = array();
        foreach ( $commentmeta as $m ) {
          $c_meta[] = array(
            'key' => $this->get_tag( $m, 'wp:meta_key' ),
            'value' => $this->get_tag( $m, 'wp:meta_value' ),
          );
        }

        $post_comments[] = array(
          'comment_id' => $this->get_tag( $comment, 'wp:comment_id' ),
          'comment_author' => $this->get_tag( $comment, 'wp:comment_author' ),
          'comment_author_email' => $this->get_tag( $comment, 'wp:comment_author_email' ),
          'comment_author_IP' => $this->get_tag( $comment, 'wp:comment_author_IP' ),
          'comment_author_url' => $this->get_tag( $comment, 'wp:comment_author_url' ),
          'comment_date' => $this->get_tag( $comment, 'wp:comment_date' ),
          'comment_date_gmt' => $this->get_tag( $comment, 'wp:comment_date_gmt' ),
          'comment_content' => $this->get_tag( $comment, 'wp:comment_content' ),
          'comment_approved' => $this->get_tag( $comment, 'wp:comment_approved' ),
          'comment_type' => $this->get_tag( $comment, 'wp:comment_type' ),
          'comment_parent' => $this->get_tag( $comment, 'wp:comment_parent' ),
          'comment_user_id' => $this->get_tag( $comment, 'wp:comment_user_id' ),
          'commentmeta' => $c_meta,
        );
      }
    }
    if ( ! empty( $post_comments ) ) $postdata['comments'] = $post_comments;

    preg_match_all( '|<wp:postmeta>(.+?)</wp:postmeta>|is', $post, $postmeta );
    $postmeta = $postmeta[1];
    if ( $postmeta ) {
      foreach ( $postmeta as $p ) {
        $post_postmeta[] = array(
          'key' => $this->get_tag( $p, 'wp:meta_key' ),
          'value' => $this->get_tag( $p, 'wp:meta_value' ),
        );
      }
    }
    if ( ! empty( $post_postmeta ) ) $postdata['postmeta'] = $post_postmeta;

    return $postdata;
  }

  function _normalize_tag( $matches ) {
    return '<' . strtolower( $matches[1] );
  }

  function fopen( $filename, $mode = 'r' ) {
    if ( $this->has_gzip )
      return gzopen( $filename, $mode );
    return fopen( $filename, $mode );
  }

  function feof( $fp ) {
    if ( $this->has_gzip )
      return gzeof( $fp );
    return feof( $fp );
  }

  function fgets( $fp, $len = 8192 ) {
    if ( $this->has_gzip )
      return gzgets( $fp, $len );
    return fgets( $fp, $len );
  }

  function fclose( $fp ) {
    if ( $this->has_gzip )
      return gzclose( $fp );
    return fclose( $fp );
  }
}