<?php

/*
 * Created on Dec 01, 2007
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2007 Yuri Astrakhan <Firstname><Lastname>@gmail.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if ( !defined( 'MEDIAWIKI' ) ) {
	// Eclipse helper - will be ignored in production
	require_once ( "ApiBase.php" );
}

/**
 * @ingroup API
 */
class ApiParse extends ApiBase {

	public function __construct( $main, $action ) {
		parent :: __construct( $main, $action );
	}

	public function execute() {
		// The data is hot but user-dependent, like page views, so we set vary cookies
		$this->getMain()->setCacheMode( 'anon-public-user-private' );

		// Get parameters
		$params = $this->extractRequestParams();
		$text = $params['text'];
		$title = $params['title'];
		$page = $params['page'];
		$oldid = $params['oldid'];
		if ( !is_null( $page ) && ( !is_null( $text ) || $title != "API" ) )
			$this->dieUsage( "The page parameter cannot be used together with the text and title parameters", 'params' );
		$prop = array_flip( $params['prop'] );
		$revid = false;

		// The parser needs $wgTitle to be set, apparently the
		// $title parameter in Parser::parse isn't enough *sigh*
		global $wgParser, $wgUser, $wgTitle, $wgEnableParserCache;
		$popts = new ParserOptions();
		$popts->setTidy( true );
		$popts->enableLimitReport();
		$redirValues = null;
		if ( !is_null( $oldid ) || !is_null( $page ) )
		{
			if ( !is_null( $oldid ) )
			{
				// Don't use the parser cache
				$rev = Revision::newFromID( $oldid );
				if ( !$rev )
					$this->dieUsage( "There is no revision ID $oldid", 'missingrev' );
				if ( !$rev->userCan( Revision::DELETED_TEXT ) )
					$this->dieUsage( "You don't have permission to view deleted revisions", 'permissiondenied' );

				$text = $rev->getText( Revision::FOR_THIS_USER );
				$titleObj = $rev->getTitle();
				$wgTitle = $titleObj;
				$p_result = $wgParser->parse( $text, $titleObj, $popts );
			}
			else
			{
				if ( $params['redirects'] )
				{
					$req = new FauxRequest( array(
						'action' => 'query',
						'redirects' => '',
						'titles' => $page
					) );
					$main = new ApiMain( $req );
					$main->execute();
					$data = $main->getResultData();
					$redirValues = @$data['query']['redirects'];
					$to = $page;
					foreach ( (array)$redirValues as $r )
						$to = $r['to'];
				}
				else
					$to = $page;
				$titleObj = Title::newFromText( $to );
				if ( !$titleObj )
					$this->dieUsage( "The page you specified doesn't exist", 'missingtitle' );

				$articleObj = new Article( $titleObj );
				if ( isset( $prop['revid'] ) )
					$oldid = $articleObj->getRevIdFetched();
				// Try the parser cache first
				$p_result = false;
				$pcache = ParserCache::singleton();
				if ( $wgEnableParserCache )
					$p_result = $pcache->get( $articleObj, $wgUser );
				if ( !$p_result )
				{
					$p_result = $wgParser->parse( $articleObj->getContent(), $titleObj, $popts );
					
					if ( $wgEnableParserCache )
						$pcache->save( $p_result, $articleObj, $popts );
				}
			}
		}
		else
		{
			$titleObj = Title::newFromText( $title );
			if ( !$titleObj )
				$titleObj = Title::newFromText( "API" );
			$wgTitle = $titleObj;
			if ( $params['pst'] || $params['onlypst'] )
				$text = $wgParser->preSaveTransform( $text, $titleObj, $wgUser, $popts );
			if ( $params['onlypst'] )
			{
				// Build a result and bail out
				$result_array['text'] = array();
				$this->getResult()->setContent( $result_array['text'], $text );
				$this->getResult()->addValue( null, $this->getModuleName(), $result_array );
				return;
			}
			$p_result = $wgParser->parse( $text, $titleObj, $popts );
		}

		// Return result
		$result = $this->getResult();
		$result_array = array();
		if ( $params['redirects'] && !is_null( $redirValues ) )
			$result_array['redirects'] = $redirValues;
		
		if ( isset( $prop['text'] ) ) {
			$result_array['text'] = array();
			$result->setContent( $result_array['text'], $p_result->getText() );
		}
		
		if ( !is_null( $params['summary'] ) ) {
			$result_array['parsedsummary'] = array();
			$result->setContent( $result_array['parsedsummary'], $wgUser->getSkin()->formatComment( $params['summary'], $titleObj ) );
		}
		
		if ( isset( $prop['langlinks'] ) )
			$result_array['langlinks'] = $this->formatLangLinks( $p_result->getLanguageLinks() );
		if ( isset( $prop['categories'] ) )
			$result_array['categories'] = $this->formatCategoryLinks( $p_result->getCategories() );
		if ( isset( $prop['links'] ) )
			$result_array['links'] = $this->formatLinks( $p_result->getLinks() );
		if ( isset( $prop['templates'] ) )
			$result_array['templates'] = $this->formatLinks( $p_result->getTemplates() );
		if ( isset( $prop['images'] ) )
			$result_array['images'] = array_keys( $p_result->getImages() );
		if ( isset( $prop['externallinks'] ) )
			$result_array['externallinks'] = array_keys( $p_result->getExternalLinks() );
		if ( isset( $prop['sections'] ) )
			$result_array['sections'] = $p_result->getSections();
		if ( isset( $prop['displaytitle'] ) )
			$result_array['displaytitle'] = $p_result->getDisplayTitle() ?
							$p_result->getDisplayTitle() :
							$titleObj->getPrefixedText();
			
		if ( isset( $prop['headitems'] ) )
			$result_array['headitems'] = $this->formatHeadItems( $p_result->getHeadItems() );
		
		if ( isset( $prop['headhtml'] ) ) {
			$out = new OutputPage;
			$out->addParserOutputNoText( $p_result );
			$result_array['headhtml'] = array();
			$result->setContent( $result_array['headhtml'], $out->headElement( $wgUser->getSkin() ) );
		}
		
		if ( !is_null( $oldid ) )
			$result_array['revid'] = intval( $oldid );

		$result_mapping = array(
			'redirects' => 'r',
			'langlinks' => 'll',
			'categories' => 'cl',
			'links' => 'pl',
			'templates' => 'tl',
			'images' => 'img',
			'externallinks' => 'el',
			'sections' => 's',
			'headitems' => 'hi'
		);
		$this->setIndexedTagNames( $result_array, $result_mapping );
		$result->addValue( null, $this->getModuleName(), $result_array );
	}

	private function formatLangLinks( $links ) {
		$result = array();
		foreach ( $links as $link ) {
			$entry = array();
			$bits = explode( ':', $link, 2 );
			$entry['lang'] = $bits[0];
			$this->getResult()->setContent( $entry, $bits[1] );
			$result[] = $entry;
		}
		return $result;
	}

	private function formatCategoryLinks( $links ) {
		$result = array();
		foreach ( $links as $link => $sortkey ) {
			$entry = array();
			$entry['sortkey'] = $sortkey;
			$this->getResult()->setContent( $entry, $link );
			$result[] = $entry;
		}
		return $result;
	}

	private function formatLinks( $links ) {
		$result = array();
		foreach ( $links as $ns => $nslinks ) {
			foreach ( $nslinks as $title => $id ) {
				$entry = array();
				$entry['ns'] = $ns;
				$this->getResult()->setContent( $entry, Title::makeTitle( $ns, $title )->getFullText() );
				if ( $id != 0 )
					$entry['exists'] = '';
				$result[] = $entry;
			}
		}
		return $result;
	}

	private function formatHeadItems( $headItems ) {
		$result = array();
		foreach ( $headItems as $tag => $content ) {
			$entry = array();
			$entry['tag'] = $tag;
			$this->getResult()->setContent( $entry, $content );
			$result[] = $entry;
		}
		return $result;
	}

	private function setIndexedTagNames( &$array, $mapping ) {
		foreach ( $mapping as $key => $name ) {
			if ( isset( $array[$key] ) )
				$this->getResult()->setIndexedTagName( $array[$key], $name );
		}
	}

	public function getAllowedParams() {
		return array (
			'title' => array(
				ApiBase :: PARAM_DFLT => 'API',
			),
			'text' => null,
			'summary' => null,
			'page' => null,
			'redirects' => false,
			'oldid' => null,
			'prop' => array(
				ApiBase :: PARAM_DFLT => 'text|langlinks|categories|links|templates|images|externallinks|sections|revid|displaytitle',
				ApiBase :: PARAM_ISMULTI => true,
				ApiBase :: PARAM_TYPE => array(
					'text',
					'langlinks',
					'categories',
					'links',
					'templates',
					'images',
					'externallinks',
					'sections',
					'revid',
					'displaytitle',
					'headitems',
					'headhtml'
				)
			),
			'pst' => false,
			'onlypst' => false,
		);
	}

	public function getParamDescription() {
		return array (
			'text' => 'Wikitext to parse',
			'summary' => 'Summary to parse',
			'redirects' => 'If the page parameter is set to a redirect, resolve it',
			'title' => 'Title of page the text belongs to',
			'page' => 'Parse the content of this page. Cannot be used together with text and title',
			'oldid' => 'Parse the content of this revision. Overrides page',
			'prop' => array( 'Which pieces of information to get.',
					'NOTE: Section tree is only generated if there are more than 4 sections, or if the __TOC__ keyword is present'
			),
			'pst' => array(	'Do a pre-save transform on the input before parsing it.',
					'Ignored if page or oldid is used.'
			),
			'onlypst' => array( 'Do a PST on the input, but don\'t parse it.',
					'Returns PSTed wikitext. Ignored if page or oldid is used.'
			),
		);
	}

	public function getDescription() {
		return 'This module parses wikitext and returns parser output';
	}
	
	public function getPossibleErrors() {
		return array_merge( parent::getPossibleErrors(), array(
			array( 'code' => 'params', 'info' => 'The page parameter cannot be used together with the text and title parameters' ),
			array( 'code' => 'missingrev', 'info' => 'There is no revision ID oldid' ),
			array( 'code' => 'permissiondenied', 'info' => 'You don\'t have permission to view deleted revisions' ),
			array( 'code' => 'missingtitle', 'info' => 'The page you specified doesn\'t exist' ),
		) );
	}

	protected function getExamples() {
		return array (
			'api.php?action=parse&text={{Project:Sandbox}}'
		);
	}

	public function getVersion() {
		return __CLASS__ . ': $Id: ApiParse.php 69932 2010-07-26 08:03:21Z tstarling $';
	}
}