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

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

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

		$internal_errors = libxml_use_internal_errors( true );

		$dom       = new DOMDocument;
		$success = $dom->loadXML( file_get_contents( $file ) );

		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'] );
			$categories[] = 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 ( $xml->xpath( '/rss/channel/wp:tag' ) as $term_arr ) {
			$t      = $term_arr->children( $namespaces['wp'] );
			$tags[] = 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 ( $xml->xpath( '/rss/channel/wp:term' ) as $term_arr ) {
			$t       = $term_arr->children( $namespaces['wp'] );
			$terms[] = 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
			);
		}

		// 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;
			$post['post_author_id'] = (int) $wp->post_author_id;
			$post['parser']         = __CLASS__;

			if ( $post['post_type'] == 'lp_course' ) {
				$post['section'] = array();
				if ( isset( $wp->section ) ) {
					foreach ( $wp->section as $_section ) {
						$section = array(
							'section_course_id'   => (int) $_section->section_course_id,
							'section_name'        => (string) $_section->section_name,
							'section_description' => (string) $_section->section_description,
							'section_order'       => (int) $_section->section_order,
							'items'               => array()
						);

						if ( isset( $_section->section_item ) ) {
							foreach ( $_section->section_item as $_item ) {
								$section['items'][] = array(
									'item_id'    => (int) $_item->item_id,
									'item_order' => (int) $_item->item_order,
									'item_type'  => (string) $_item->item_type,
								);
							}
						}

						$post['section'][] = $section;
					}
				}
			}

			if ( $post['post_type'] == 'lp_quiz' ) {
				///
				$post['questions'] = array();
				if ( $wp->question ) {
					foreach ( $wp->question as $question ) {
						$_question = array(
							'quiz_id'        => (int) $question->quiz_id,
							'question_id'    => (int) $question->question_id,
							'question_order' => (int) $question->question_order
						);

						$post['questions'][] = $_question;
					}
				}
			}

			if ( $post['post_type'] == 'lp_question' ) {
				///
				$post['answers'] = array();

				if ( $wp->answer ) {
					foreach ( $wp->answer as $answer ) {
						
						$_answer = array(
							'question_id'  => (int) $answer->question_id,
							'title'  => (string) $answer->answer_title,
							'value'  =>(string) $answer->answer_value,
							'order'  => (int) $answer->answer_order,
							'is_true'  =>(string) $answer->answer_is_true, 
						);

						$post['answers'][] = $_answer;
					}
				}
				$post['answers_meta'] = array();

				if ( $wp->answer_meta ) {
					foreach ( $wp->answer_meta as $answer_meta ) {

						$_answer_meta = array(
							'question_id' => (int) $answer_meta->question_answer_id,
							'meta_key'    => (string) $answer_meta->meta_key,
							'meta_value'  => (string) $answer_meta->meta_value,
						);

						$post['answers_meta'][] = $_answer_meta;
					}
				}
			}

			if ( isset( $wp->attachment ) ) {
				$att                = $wp->attachment->attributes();
				$post['attachment'] = array(
					'id'        => (int) $att['id'],
					'mime_type' => (string) $att['mime_type'],
					'filename'  => (string) $att['filename'],
					'data'      => (string) $wp->attachment
				);
			}
			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'],
						'id'          => (int) $att['id'],
						'parent'      => (int) $att['parent'],
						'description' => (string) $att['description'],
					);
			}

			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[] = apply_filters( 'learn-press/import/postdata', $post, $wp );

		}

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

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

		return array(
			'authors'        => $authors,
			'posts'          => $posts,
			'categories'     => $categories,
			'tags'           => $tags,
			'terms'          => $terms,
			'base_url'       => $base_url,
			'version'        => $wxr_version,
			'plugin_name'    => !$plugin_name ? 'learnpress-import-export' : $plugin_name,
			'plugin_version' => !$plugin_version ? '0.9' : $plugin_version,
			'parser'         => 'LPR_Export_Import_Parser_SimpleXML'
		);
	}
}

/**
 * WXR Parser that makes use of the XML Parser PHP extension.
 */
class LPR_Export_Import_Parser_XML {
	var $wp_tags = array(
		'wp:post_id', 'wp:post_date', 'wp:post_date_gmt', 'wp:comment_status', 'wp:ping_status', 'wp:attachment',
		'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', 'post_author_id'
	);
	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',
	);

	var $plugin_name = 'learnperss';
	var $plugin_version = '0.9';

	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,
			'plugin_name'    => $this->plugin_name,
			'plugin_version' => $this->plugin_version,
			'parser'         => 'LPR_Export_Import_Parser_XML'
		);
	}

	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;

		$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;
			case 'wp:plugin_name':
				$this->plugin_name = $this->cdata;
				break;
			case 'wp:plugin_version':
				$this->plugin_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 LPR_Export_Import_Parser_Regex {
	var $authors = array();
	var $posts = array();
	var $categories = array();
	var $tags = array();
	var $terms = array();
	var $base_url = '';
	var $plugin_name = 'learnperss';
	var $plugin_version = LEARNPRESS_VERSION;

	function WXR_Parser_Regex() {
		$this->__construct();
	}

	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:plugin_name>' ) ) {
					preg_match( '|<wp:plugin_name>(.*?)</wp:plugin_name>|is', $importline, $plugin_name );
					$this->plugin_name = $plugin_name[1];
					continue;
				}
				if ( false !== strpos( $importline, '<wp:plugin_version>' ) ) {
					preg_match( '|<wp:plugin_version>(.*?)</wp:plugin_version>|is', $importline, $plugin_version );
					$this->plugin_version = $plugin_version[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,
			'plugin_name'    => $this->plugin_name,
			'plugin_version' => $this->plugin_version,
			'parser'         => 'LPR_Export_Import_Parser_Regex'
		);
	}

	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_author_id = $this->get_tag( $post, 'wp:post_author_id' );

		$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', 'post_author_id'
		);

		$attachment = $this->get_tag( $post, 'wp:attachment' );
		if ( $attachment ) {
			preg_match_all( '|<wp:attachment id="([^"]+?)" mime_type="([^"]+?)" filename="([^"]+?)">(.+?)</wp:attachment>|is', $post, $attachments, PREG_SET_ORDER );
			if ( $attachments ) {
				$postdata['attachment'] = array(
					'id'        => $attachments[0][1],
					'mime_type' => $attachments[0][2],
					'filename'  => $attachments[0][3],
					'data'      => $attachment
				);
			}
		}


		preg_match_all( '|<category domain="([^"]+?)" nicename="([^"]+?)" id="([^"]+?)" parent="([^"]+?)" description="([^"]+?)">(.+?)</category>|is', $post, $terms, PREG_SET_ORDER );
		foreach ( $terms as $t ) {
			$post_terms[] = array(
				'slug'        => $t[2],
				'domain'      => $t[1],
				'id'          => $t[3],
				'parent'      => $t[4],
				'description' => $t[5],
				'name'        => str_replace( array( '<![CDATA[', ']]>' ), '', $t[6] ),
			);
		}
		if ( !empty( $post_terms ) ) $postdata['terms'] = $post_terms;

		if ( $post_type == 'lp_course' ) {
			//
			$postdata['sections'] = array();
			preg_match_all( '|<wp:section>(.+?)</wp:section>|is', $post, $sections );
			$sections = $sections[1];
			if ( $sections ) {
				foreach ( $sections as $section ) {
					$_section = array(
						'section_name'        => $this->get_tag( $section, 'wp:section_name' ),
						'section_description' => $this->get_tag( $section, 'wp:section_description' ),
						'section_order'       => $this->get_tag( $section, 'wp:section_order' ),
						'section_course_id'   => $this->get_tag( $section, 'wp:section_course_id' ),
						'items'               => array()
					);

					preg_match_all( '|<wp:section_item>(.+?)</wp:section_item>|is', $section, $section_items );
					$section_items = $section_items[1];
					if ( $section_items ) {
						foreach ( $section_items as $item ) {
							$_section['items'][] = array(
								'item_id'    => $this->get_tag( $section, 'wp:item_id' ),
								'item_type'  => $this->get_tag( $section, 'wp:item_type' ),
								'item_order' => $this->get_tag( $section, 'wp:item_order' )
							);
						}
					}
					$postdata['sections'][] = $_section;
				}
			}
		}
		if ( $post_type == 'lp_quiz' ) {
			///
			$postdata['questions'] = array();
			preg_match_all( '|<wp:question>(.+?)</wp:question>|is', $post, $questions );
			$questions = $questions[1];
			if ( $questions ) {
				foreach ( $questions as $question ) {
					$_question = array(
						'quiz_id'        => $this->get_tag( $question, 'wp:quiz_id' ),
						'question_id'    => $this->get_tag( $question, 'wp:question_id' ),
						'params'         => $this->get_tag( $question, 'wp:params' ),
						'question_order' => $this->get_tag( $question, 'wp:question_order' )
					);

					$postdata['questions'][] = $_question;
				}
			}
		}

		if ( $post_type == 'lp_question' ) {
			///
			$postdata['answers'] = array();
			if ( preg_match_all( '|<wp:answer>(.+?)</wp:answer>|is', $post, $answers ) ) {
				$answers = $answers[1];
				if ( $answers ) {
					foreach ( $answers as $answer ) {
						$_answer = array(
							'question_id' => $this->get_tag( $answer, 'wp:question_id' ),
							'title'       => $this->get_tag( $answer, 'wp:answer_title' ),
							'value'       => $this->get_tag( $answer, 'wp:answer_value' ),
							'order'       => $this->get_tag( $answer, 'wp:answer_order' ),
							'is_true'     => $this->get_tag( $answer, 'wp:answer_is_true' ),
						);

						$postdata['answers'][] = $_answer;
					}
				}
			}
			$postdata['answers_meta'] = array();

			if ( preg_match_all( '|<wp:answer_meta>(.+?)</wp:answer_meta>|is', $post, $answers_meta ) ) {
				$answers_meta = $answers_meta[1];
				if ( $answers_meta ) {
					foreach ( $answers_meta as $answer_meta ) {
						$_answer_meta = array(
							'learnpress_question_answer_id' => $this->get_tag( $answer_meta, 'wp:question_answer_id' ),
							'meta_key'   => $this->get_tag( $answer_meta, 'wp:meta_key' ),
							'meta_value' => $this->get_tag( $answer_meta, 'wp:meta_value' ),
						);

						$postdata['answers_meta'][] = $_answer_meta;
					}
				}
			}
		}
		
		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;

		$postdata['parser'] = __CLASS__;

		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 );
	}
}