ApiParse.php

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<?php
class ApiParse extends ApiBase {

    private $section = null;

    private $content = null;

    private $pstContent = null;

    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'];
        if ( $title === null ) {
            $titleProvided = false;
            // A title is needed for parsing, so arbitrarily choose one
            $title = 'API';
        } else {
            $titleProvided = true;
        }

        $page = $params['page'];
        $pageid = $params['pageid'];
        $oldid = $params['oldid'];

        $model = $params['contentmodel'];
        $format = $params['contentformat'];

        if ( !is_null( $page ) && ( !is_null( $text ) || $titleProvided ) ) {
            $this->dieUsage(
                'The page parameter cannot be used together with the text and title parameters',
                'params'
            );
        }

        $prop = array_flip( $params['prop'] );

        if ( isset( $params['section'] ) ) {
            $this->section = $params['section'];
        } else {
            $this->section = false;
        }

        // The parser needs $wgTitle to be set, apparently the
        // $title parameter in Parser::parse isn't enough *sigh*
        // TODO: Does this still need $wgTitle?
        global $wgParser, $wgTitle;

        // Currently unnecessary, code to act as a safeguard against any change
        // in current behavior of uselang
        $oldLang = null;
        if ( isset( $params['uselang'] )
            && $params['uselang'] != $this->getContext()->getLanguage()->getCode()
        ) {
            $oldLang = $this->getContext()->getLanguage(); // Backup language
            $this->getContext()->setLanguage( Language::factory( $params['uselang'] ) );
        }

        $redirValues = null;

        // Return result
        $result = $this->getResult();

        if ( !is_null( $oldid ) || !is_null( $pageid ) || !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->getUser() ) ) {
                    $this->dieUsage( "You don't have permission to view deleted revisions", 'permissiondenied' );
                }

                $titleObj = $rev->getTitle();
                $wgTitle = $titleObj;
                $pageObj = WikiPage::factory( $titleObj );
                $popts = $this->makeParserOptions( $pageObj, $params );

                // If for some reason the "oldid" is actually the current revision, it may be cached
                if ( $rev->isCurrent() ) {
                    // May get from/save to parser cache
                    $p_result = $this->getParsedContent( $pageObj, $popts,
                        $pageid, isset( $prop['wikitext'] ) );
                } else { // This is an old revision, so get the text differently
                    $this->content = $rev->getContent( Revision::FOR_THIS_USER, $this->getUser() );

                    if ( $this->section !== false ) {
                        $this->content = $this->getSectionContent( $this->content, 'r' . $rev->getId() );
                    }

                    // Should we save old revision parses to the parser cache?
                    $p_result = $this->content->getParserOutput( $titleObj, $rev->getId(), $popts );
                }
            } else { // Not $oldid, but $pageid or $page
                if ( $params['redirects'] ) {
                    $reqParams = array(
                        'action' => 'query',
                        'redirects' => '',
                    );
                    if ( !is_null( $pageid ) ) {
                        $reqParams['pageids'] = $pageid;
                    } else { // $page
                        $reqParams['titles'] = $page;
                    }
                    $req = new FauxRequest( $reqParams );
                    $main = new ApiMain( $req );
                    $main->execute();
                    $data = $main->getResultData();
                    $redirValues = isset( $data['query']['redirects'] )
                        ? $data['query']['redirects']
                        : array();
                    $to = $page;
                    foreach ( (array)$redirValues as $r ) {
                        $to = $r['to'];
                    }
                    $pageParams = array( 'title' => $to );
                } elseif ( !is_null( $pageid ) ) {
                    $pageParams = array( 'pageid' => $pageid );
                } else { // $page
                    $pageParams = array( 'title' => $page );
                }

                $pageObj = $this->getTitleOrPageId( $pageParams, 'fromdb' );
                $titleObj = $pageObj->getTitle();
                if ( !$titleObj || !$titleObj->exists() ) {
                    $this->dieUsage( "The page you specified doesn't exist", 'missingtitle' );
                }
                $wgTitle = $titleObj;

                if ( isset( $prop['revid'] ) ) {
                    $oldid = $pageObj->getLatest();
                }

                $popts = $this->makeParserOptions( $pageObj, $params );

                // Potentially cached
                $p_result = $this->getParsedContent( $pageObj, $popts, $pageid,
                    isset( $prop['wikitext'] ) );
            }
        } else { // Not $oldid, $pageid, $page. Hence based on $text
            $titleObj = Title::newFromText( $title );
            if ( !$titleObj || $titleObj->isExternal() ) {
                $this->dieUsageMsg( array( 'invalidtitle', $title ) );
            }
            $wgTitle = $titleObj;
            if ( $titleObj->canExist() ) {
                $pageObj = WikiPage::factory( $titleObj );
            } else {
                // Do like MediaWiki::initializeArticle()
                $article = Article::newFromTitle( $titleObj, $this->getContext() );
                $pageObj = $article->getPage();
            }

            $popts = $this->makeParserOptions( $pageObj, $params );
            $textProvided = !is_null( $text );

            if ( !$textProvided ) {
                if ( $titleProvided && ( $prop || $params['generatexml'] ) ) {
                    $this->setWarning(
                        "'title' used without 'text', and parsed page properties were requested " .
                        "(did you mean to use 'page' instead of 'title'?)"
                    );
                }
                // Prevent warning from ContentHandler::makeContent()
                $text = '';
            }

            // If we are parsing text, do not use the content model of the default
            // API title, but default to wikitext to keep BC.
            if ( $textProvided && !$titleProvided && is_null( $model ) ) {
                $model = CONTENT_MODEL_WIKITEXT;
                $this->setWarning( "No 'title' or 'contentmodel' was given, assuming $model." );
            }

            try {
                $this->content = ContentHandler::makeContent( $text, $titleObj, $model, $format );
            } catch ( MWContentSerializationException $ex ) {
                $this->dieUsage( $ex->getMessage(), 'parseerror' );
            }

            if ( $this->section !== false ) {
                $this->content = $this->getSectionContent( $this->content, $titleObj->getText() );
            }

            if ( $params['pst'] || $params['onlypst'] ) {
                $this->pstContent = $this->content->preSaveTransform( $titleObj, $this->getUser(), $popts );
            }
            if ( $params['onlypst'] ) {
                // Build a result and bail out
                $result_array = array();
                $result_array['text'] = array();
                ApiResult::setContent( $result_array['text'], $this->pstContent->serialize( $format ) );
                if ( isset( $prop['wikitext'] ) ) {
                    $result_array['wikitext'] = array();
                    ApiResult::setContent( $result_array['wikitext'], $this->content->serialize( $format ) );
                }
                $result->addValue( null, $this->getModuleName(), $result_array );

                return;
            }

            // Not cached (save or load)
            if ( $params['pst'] ) {
                $p_result = $this->pstContent->getParserOutput( $titleObj, null, $popts );
            } else {
                $p_result = $this->content->getParserOutput( $titleObj, null, $popts );
            }
        }

        $result_array = array();

        $result_array['title'] = $titleObj->getPrefixedText();

        if ( !is_null( $oldid ) ) {
            $result_array['revid'] = intval( $oldid );
        }

        if ( $params['redirects'] && !is_null( $redirValues ) ) {
            $result_array['redirects'] = $redirValues;
        }

        if ( $params['disabletoc'] ) {
            $p_result->setTOCEnabled( false );
        }

        if ( isset( $prop['text'] ) ) {
            $result_array['text'] = array();
            ApiResult::setContent( $result_array['text'], $p_result->getText() );
        }

        if ( !is_null( $params['summary'] ) ) {
            $result_array['parsedsummary'] = array();
            ApiResult::setContent(
                $result_array['parsedsummary'],
                Linker::formatComment( $params['summary'], $titleObj )
            );
        }

        if ( isset( $prop['langlinks'] ) || isset( $prop['languageshtml'] ) ) {
            $langlinks = $p_result->getLanguageLinks();

            if ( $params['effectivelanglinks'] ) {
                // Link flags are ignored for now, but may in the future be
                // included in the result.
                $linkFlags = array();
                wfRunHooks( 'LanguageLinks', array( $titleObj, &$langlinks, &$linkFlags ) );
            }
        } else {
            $langlinks = false;
        }

        if ( isset( $prop['langlinks'] ) ) {
            $result_array['langlinks'] = $this->formatLangLinks( $langlinks );
        }
        if ( isset( $prop['languageshtml'] ) ) {
            $languagesHtml = $this->languagesHtml( $langlinks );

            $result_array['languageshtml'] = array();
            ApiResult::setContent( $result_array['languageshtml'], $languagesHtml );
        }
        if ( isset( $prop['categories'] ) ) {
            $result_array['categories'] = $this->formatCategoryLinks( $p_result->getCategories() );
        }
        if ( isset( $prop['categorieshtml'] ) ) {
            $categoriesHtml = $this->categoriesHtml( $p_result->getCategories() );
            $result_array['categorieshtml'] = array();
            ApiResult::setContent( $result_array['categorieshtml'], $categoriesHtml );
        }
        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'] ) || isset( $prop['headhtml'] ) ) {
            $context = $this->getContext();
            $context->setTitle( $titleObj );
            $context->getOutput()->addParserOutputNoText( $p_result );

            if ( isset( $prop['headitems'] ) ) {
                $headItems = $this->formatHeadItems( $p_result->getHeadItems() );

                $css = $this->formatCss( $context->getOutput()->buildCssLinksArray() );

                $scripts = array( $context->getOutput()->getHeadScripts() );

                $result_array['headitems'] = array_merge( $headItems, $css, $scripts );
            }

            if ( isset( $prop['headhtml'] ) ) {
                $result_array['headhtml'] = array();
                ApiResult::setContent(
                    $result_array['headhtml'],
                    $context->getOutput()->headElement( $context->getSkin() )
                );
            }
        }

        if ( isset( $prop['iwlinks'] ) ) {
            $result_array['iwlinks'] = $this->formatIWLinks( $p_result->getInterwikiLinks() );
        }

        if ( isset( $prop['wikitext'] ) ) {
            $result_array['wikitext'] = array();
            ApiResult::setContent( $result_array['wikitext'], $this->content->serialize( $format ) );
            if ( !is_null( $this->pstContent ) ) {
                $result_array['psttext'] = array();
                ApiResult::setContent( $result_array['psttext'], $this->pstContent->serialize( $format ) );
            }
        }
        if ( isset( $prop['properties'] ) ) {
            $result_array['properties'] = $this->formatProperties( $p_result->getProperties() );
        }

        if ( isset( $prop['limitreportdata'] ) ) {
            $result_array['limitreportdata'] = $this->formatLimitReportData( $p_result->getLimitReportData() );
        }
        if ( isset( $prop['limitreporthtml'] ) ) {
            $limitreportHtml = EditPage::getPreviewLimitReport( $p_result );
            $result_array['limitreporthtml'] = array();
            ApiResult::setContent( $result_array['limitreporthtml'], $limitreportHtml );
        }

        if ( $params['generatexml'] ) {
            if ( $this->content->getModel() != CONTENT_MODEL_WIKITEXT ) {
                $this->dieUsage( "generatexml is only supported for wikitext content", "notwikitext" );
            }

            $wgParser->startExternalParse( $titleObj, $popts, OT_PREPROCESS );
            $dom = $wgParser->preprocessToDom( $this->content->getNativeData() );
            if ( is_callable( array( $dom, 'saveXML' ) ) ) {
                $xml = $dom->saveXML();
            } else {
                $xml = $dom->__toString();
            }
            $result_array['parsetree'] = array();
            ApiResult::setContent( $result_array['parsetree'], $xml );
        }

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

        if ( !is_null( $oldLang ) ) {
            $this->getContext()->setLanguage( $oldLang ); // Reset language to $oldLang
        }
    }

    protected function makeParserOptions( WikiPage $pageObj, array $params ) {
        wfProfileIn( __METHOD__ );

        $popts = $pageObj->makeParserOptions( $this->getContext() );
        $popts->enableLimitReport( !$params['disablepp'] );
        $popts->setIsPreview( $params['preview'] || $params['sectionpreview'] );
        $popts->setIsSectionPreview( $params['sectionpreview'] );

        wfProfileOut( __METHOD__ );

        return $popts;
    }

    private function getParsedContent( WikiPage $page, $popts, $pageId = null, $getWikitext = false ) {
        $this->content = $page->getContent( Revision::RAW ); //XXX: really raw?

        if ( $this->section !== false && $this->content !== null ) {
            $this->content = $this->getSectionContent(
                $this->content,
                !is_null( $pageId ) ? 'page id ' . $pageId : $page->getTitle()->getText()
            );

            // Not cached (save or load)
            return $this->content->getParserOutput( $page->getTitle(), null, $popts );
        }

        // Try the parser cache first
        // getParserOutput will save to Parser cache if able
        $pout = $page->getParserOutput( $popts );
        if ( !$pout ) {
            $this->dieUsage( "There is no revision ID {$page->getLatest()}", 'missingrev' );
        }
        if ( $getWikitext ) {
            $this->content = $page->getContent( Revision::RAW );
        }

        return $pout;
    }

    private function getSectionContent( Content $content, $what ) {
        // Not cached (save or load)
        $section = $content->getSection( $this->section );
        if ( $section === false ) {
            $this->dieUsage( "There is no section {$this->section} in " . $what, 'nosuchsection' );
        }
        if ( $section === null ) {
            $this->dieUsage( "Sections are not supported by " . $what, 'nosuchsection' );
            $section = false;
        }

        return $section;
    }

    private function formatLangLinks( $links ) {
        $result = array();
        foreach ( $links as $link ) {
            $entry = array();
            $bits = explode( ':', $link, 2 );
            $title = Title::newFromText( $link );

            $entry['lang'] = $bits[0];
            if ( $title ) {
                $entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
                // localised language name in user language (maybe set by uselang=)
                $entry['langname'] = Language::fetchLanguageName( $title->getInterwiki(), $this->getLanguage()->getCode() );
                // native language name
                $entry['autonym'] = Language::fetchLanguageName( $title->getInterwiki() );
            }
            ApiResult::setContent( $entry, $bits[1] );
            $result[] = $entry;
        }

        return $result;
    }

    private function formatCategoryLinks( $links ) {
        $result = array();

        if ( !$links ) {
            return $result;
        }

        // Fetch hiddencat property
        $lb = new LinkBatch;
        $lb->setArray( array( NS_CATEGORY => $links ) );
        $db = $this->getDB();
        $res = $db->select( array( 'page', 'page_props' ),
            array( 'page_title', 'pp_propname' ),
            $lb->constructSet( 'page', $db ),
            __METHOD__,
            array(),
            array( 'page_props' => array(
                'LEFT JOIN', array( 'pp_propname' => 'hiddencat', 'pp_page = page_id' )
            ) )
        );
        $hiddencats = array();
        foreach ( $res as $row ) {
            $hiddencats[$row->page_title] = isset( $row->pp_propname );
        }

        foreach ( $links as $link => $sortkey ) {
            $entry = array();
            $entry['sortkey'] = $sortkey;
            ApiResult::setContent( $entry, $link );
            if ( !isset( $hiddencats[$link] ) ) {
                $entry['missing'] = '';
            } elseif ( $hiddencats[$link] ) {
                $entry['hidden'] = '';
            }
            $result[] = $entry;
        }

        return $result;
    }

    private function categoriesHtml( $categories ) {
        $context = $this->getContext();
        $context->getOutput()->addCategoryLinks( $categories );

        return $context->getSkin()->getCategories();
    }

    private function languagesHtml( $languages ) {
        wfDeprecated( __METHOD__, '1.18' );
        $this->setWarning( '"action=parse&prop=languageshtml" is deprecated ' .
            'and will be removed in MediaWiki 1.24. Use "prop=langlinks" ' .
            'to generate your own HTML.' );

        global $wgContLang, $wgHideInterlanguageLinks;

        if ( $wgHideInterlanguageLinks || count( $languages ) == 0 ) {
            return '';
        }

        $s = htmlspecialchars( wfMessage( 'otherlanguages' )->text() .
            wfMessage( 'colon-separator' )->text() );

        $langs = array();
        foreach ( $languages as $l ) {
            $nt = Title::newFromText( $l );
            $text = Language::fetchLanguageName( $nt->getInterwiki() );

            $langs[] = Html::element( 'a',
                array( 'href' => $nt->getFullURL(), 'title' => $nt->getText(), 'class' => 'external' ),
                $text == '' ? $l : $text );
        }

        $s .= implode( wfMessage( 'pipe-separator' )->escaped(), $langs );

        if ( $wgContLang->isRTL() ) {
            $s = Html::rawElement( 'span', array( 'dir' => 'LTR' ), $s );
        }

        return $s;
    }

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

        return $result;
    }

    private function formatIWLinks( $iw ) {
        $result = array();
        foreach ( $iw as $prefix => $titles ) {
            foreach ( array_keys( $titles ) as $title ) {
                $entry = array();
                $entry['prefix'] = $prefix;

                $title = Title::newFromText( "{$prefix}:{$title}" );
                if ( $title ) {
                    $entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
                }

                ApiResult::setContent( $entry, $title->getFullText() );
                $result[] = $entry;
            }
        }

        return $result;
    }

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

        return $result;
    }

    private function formatProperties( $properties ) {
        $result = array();
        foreach ( $properties as $name => $value ) {
            $entry = array();
            $entry['name'] = $name;
            ApiResult::setContent( $entry, $value );
            $result[] = $entry;
        }

        return $result;
    }

    private function formatCss( $css ) {
        $result = array();
        foreach ( $css as $file => $link ) {
            $entry = array();
            $entry['file'] = $file;
            ApiResult::setContent( $entry, $link );
            $result[] = $entry;
        }

        return $result;
    }

    private function formatLimitReportData( $limitReportData ) {
        $result = array();
        $apiResult = $this->getResult();

        foreach ( $limitReportData as $name => $value ) {
            $entry = array();
            $entry['name'] = $name;
            if ( !is_array( $value ) ) {
                $value = array( $value );
            }
            $apiResult->setIndexedTagName( $value, 'param' );
            $apiResult->setIndexedTagName_recursive( $value, 'param' );
            $entry = array_merge( $entry, $value );
            $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' => null,
            'text' => null,
            'summary' => null,
            'page' => null,
            'pageid' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'redirects' => false,
            'oldid' => array(
                ApiBase::PARAM_TYPE => 'integer',
            ),
            'prop' => array(
                ApiBase::PARAM_DFLT => 'text|langlinks|categories|links|templates|' .
                    'images|externallinks|sections|revid|displaytitle|iwlinks|properties',
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => array(
                    'text',
                    'langlinks',
                    'languageshtml',
                    'categories',
                    'categorieshtml',
                    'links',
                    'templates',
                    'images',
                    'externallinks',
                    'sections',
                    'revid',
                    'displaytitle',
                    'headitems',
                    'headhtml',
                    'iwlinks',
                    'wikitext',
                    'properties',
                    'limitreportdata',
                    'limitreporthtml',
                )
            ),
            'pst' => false,
            'onlypst' => false,
            'effectivelanglinks' => false,
            'uselang' => null,
            'section' => null,
            'disablepp' => false,
            'generatexml' => false,
            'preview' => false,
            'sectionpreview' => false,
            'disabletoc' => false,
            'contentformat' => array(
                ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
            ),
            'contentmodel' => array(
                ApiBase::PARAM_TYPE => ContentHandler::getContentModels(),
            )
        );
    }

    public function getParamDescription() {
        $p = $this->getModulePrefix();
        $wikitext = CONTENT_MODEL_WIKITEXT;

        return array(
            'text' => "Text to parse. Use {$p}title or {$p}contentmodel to control the content model",
            'summary' => 'Summary to parse',
            'redirects' => "If the {$p}page or the {$p}pageid parameter is set to a redirect, resolve it",
            'title' => "Title of page the text belongs to. " .
                "If omitted, {$p}contentmodel must be specified, and \"API\" will be used as the title",
            'page' => "Parse the content of this page. Cannot be used together with {$p}text and {$p}title",
            'pageid' => "Parse the content of this page. Overrides {$p}page",
            'oldid' => "Parse the content of this revision. Overrides {$p}page and {$p}pageid",
            'prop' => array(
                'Which pieces of information to get',
                ' text           - Gives the parsed text of the wikitext',
                ' langlinks      - Gives the language links in the parsed wikitext',
                ' categories     - Gives the categories in the parsed wikitext',
                ' categorieshtml - Gives the HTML version of the categories',
                ' languageshtml  - DEPRECATED. Will be removed in MediaWiki 1.24.',
                '                  Gives the HTML version of the language links',
                ' links          - Gives the internal links in the parsed wikitext',
                ' templates      - Gives the templates in the parsed wikitext',
                ' images         - Gives the images in the parsed wikitext',
                ' externallinks  - Gives the external links in the parsed wikitext',
                ' sections       - Gives the sections in the parsed wikitext',
                ' revid          - Adds the revision ID of the parsed page',
                ' displaytitle   - Adds the title of the parsed wikitext',
                ' headitems      - Gives items to put in the <head> of the page',
                ' headhtml       - Gives parsed <head> of the page',
                ' iwlinks        - Gives interwiki links in the parsed wikitext',
                ' wikitext       - Gives the original wikitext that was parsed',
                ' properties     - Gives various properties defined in the parsed wikitext',
                ' limitreportdata - Gives the limit report in a structured way.',
                "                   Gives no data, when {$p}disablepp is set.",
                ' limitreporthtml - Gives the HTML version of the limit report.',
                "                   Gives no data, when {$p}disablepp is set.",
            ),
            'effectivelanglinks' => array(
                'Includes language links supplied by extensions',
                '(for use with prop=langlinks|languageshtml)',
            ),
            'pst' => array(
                'Do a pre-save transform on the input before parsing it',
                "Only valid when used with {$p}text",
            ),
            'onlypst' => array(
                'Do a pre-save transform (PST) on the input, but don\'t parse it',
                'Returns the same wikitext, after a PST has been applied.',
                "Only valid when used with {$p}text",
            ),
            'uselang' => 'Which language to parse the request in',
            'section' => 'Only retrieve the content of this section number',
            'disablepp' => 'Disable the PP Report from the parser output',
            'generatexml' => "Generate XML parse tree (requires contentmodel=$wikitext)",
            'preview' => 'Parse in preview mode',
            'sectionpreview' => 'Parse in section preview mode (enables preview mode too)',
            'disabletoc' => 'Disable table of contents in output',
            'contentformat' => array(
                'Content serialization format used for the input text',
                "Only valid when used with {$p}text",
            ),
            'contentmodel' => array(
                "Content model of the input text. If omitted, ${p}title must be specified, " .
                    "and default will be the model of the specified ${p}title",
                "Only valid when used with {$p}text",
            ),
        );
    }

    public function getDescription() {
        $p = $this->getModulePrefix();

        return array(
            'Parses content and returns parser output.',
            'See the various prop-Modules of action=query to get information from the current' .
                'version of a page.',
            'There are several ways to specify the text to parse:',
            "1) Specify a page or revision, using {$p}page, {$p}pageid, or {$p}oldid.",
            "2) Specify content explicitly, using {$p}text, {$p}title, and {$p}contentmodel.",
            "3) Specify only a summary to parse. {$p}prop should be given an empty value.",
        );
    }

    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' ),
            array( 'code' => 'nosuchsection', 'info' => 'There is no section sectionnumber in page' ),
            array( 'nosuchpageid' ),
            array( 'invalidtitle', 'title' ),
            array( 'code' => 'parseerror', 'info' => 'Failed to parse the given text.' ),
            array(
                'code' => 'notwikitext',
                'info' => 'The requested operation is only supported on wikitext content.'
            ),
        ) );
    }

    public function getExamples() {
        return array(
            'api.php?action=parse&page=Project:Sandbox' => 'Parse a page',
            'api.php?action=parse&text={{Project:Sandbox}}&contentmodel=wikitext' => 'Parse wikitext',
            'api.php?action=parse&text={{PAGENAME}}&title=Test'
                => 'Parse wikitext, specifying the page title',
            'api.php?action=parse&summary=Some+[[link]]&prop=' => 'Parse a summary',
        );
    }

    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/API:Parsing_wikitext#parse';
    }
}