]> scripts.mit.edu Git - autoinstallsdev/mediawiki.git/blobdiff - includes/api/ApiHelp.php
MediaWiki 1.30.2
[autoinstallsdev/mediawiki.git] / includes / api / ApiHelp.php
index cb896e5f2df1f32308589a4d0306cef155427cc7..ea4f724abff6621a552f937dbbea56984c04920e 100644 (file)
@@ -1,10 +1,10 @@
 <?php
 /**
- * API for MediaWiki 1.8+
  *
- * Created on Sep 6, 2006
  *
- * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
+ * Created on Aug 29, 2014
+ *
+ * Copyright © 2014 Wikimedia Foundation and contributors
  *
  * 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
  * @file
  */
 
-if ( !defined( 'MEDIAWIKI' ) ) {
-       // Eclipse helper - will be ignored in production
-       require_once( 'ApiBase.php' );
-}
+use HtmlFormatter\HtmlFormatter;
+use MediaWiki\MediaWikiServices;
 
 /**
- * This is a simple class to handle action=help
+ * Class to output help for an API module
  *
+ * @since 1.25 completely rewritten
  * @ingroup API
  */
 class ApiHelp extends ApiBase {
+       public function execute() {
+               $params = $this->extractRequestParams();
+               $modules = [];
+
+               foreach ( $params['modules'] as $path ) {
+                       $modules[] = $this->getModuleFromPath( $path );
+               }
+
+               // Get the help
+               $context = new DerivativeContext( $this->getMain()->getContext() );
+               $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
+               $context->setLanguage( $this->getMain()->getLanguage() );
+               $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
+               $out = new OutputPage( $context );
+               $out->setCopyrightUrl( 'https://www.mediawiki.org/wiki/Special:MyLanguage/Copyright' );
+               $context->setOutput( $out );
+
+               self::getHelp( $context, $modules, $params );
 
-       public function __construct( $main, $action ) {
-               parent::__construct( $main, $action );
+               // Grab the output from the skin
+               ob_start();
+               $context->getOutput()->output();
+               $html = ob_get_clean();
+
+               $result = $this->getResult();
+               if ( $params['wrap'] ) {
+                       $data = [
+                               'mime' => 'text/html',
+                               'filename' => 'api-help.html',
+                               'help' => $html,
+                       ];
+                       ApiResult::setSubelementsList( $data, 'help' );
+                       $result->addValue( null, $this->getModuleName(), $data );
+               } else {
+                       $result->reset();
+                       $result->addValue( null, 'text', $html, ApiResult::NO_SIZE_CHECK );
+                       $result->addValue( null, 'mime', 'text/html', ApiResult::NO_SIZE_CHECK );
+                       $result->addValue( null, 'filename', 'api-help.html', ApiResult::NO_SIZE_CHECK );
+               }
        }
 
        /**
-        * Module for displaying help
+        * Generate help for the specified modules
+        *
+        * Help is placed into the OutputPage object returned by
+        * $context->getOutput().
+        *
+        * Recognized options include:
+        *  - headerlevel: (int) Header tag level
+        *  - nolead: (bool) Skip the inclusion of api-help-lead
+        *  - noheader: (bool) Skip the inclusion of the top-level section headers
+        *  - submodules: (bool) Include help for submodules of the current module
+        *  - recursivesubmodules: (bool) Include help for submodules recursively
+        *  - helptitle: (string) Title to link for additional modules' help. Should contain $1.
+        *  - toc: (bool) Include a table of contents
+        *
+        * @param IContextSource $context
+        * @param ApiBase[]|ApiBase $modules
+        * @param array $options Formatting options (described above)
         */
-       public function execute() {
-               // Get parameters
-               $params = $this->extractRequestParams();
+       public static function getHelp( IContextSource $context, $modules, array $options ) {
+               global $wgContLang;
 
-               if ( !isset( $params['modules'] ) && !isset( $params['querymodules'] ) ) {
-                       $this->dieUsage( '', 'help' );
+               if ( !is_array( $modules ) ) {
+                       $modules = [ $modules ];
                }
 
-               $this->getMain()->setHelp();
-
-               $result = $this->getResult();
-               $queryObj = new ApiQuery( $this->getMain(), 'query' );
-               $r = array();
-               if ( is_array( $params['modules'] ) ) {
-                       $modArr = $this->getMain()->getModules();
+               $out = $context->getOutput();
+               $out->addModuleStyles( [
+                       'mediawiki.hlist',
+                       'mediawiki.apihelp',
+               ] );
+               if ( !empty( $options['toc'] ) ) {
+                       $out->addModules( 'mediawiki.toc' );
+               }
+               $out->setPageTitle( $context->msg( 'api-help-title' ) );
 
-                       foreach ( $params['modules'] as $m ) {
-                               if ( !isset( $modArr[$m] ) ) {
-                                       $r[] = array( 'name' => $m, 'missing' => '' );
-                                       continue;
+               $cache = MediaWikiServices::getInstance()->getMainWANObjectCache();
+               $cacheKey = null;
+               if ( count( $modules ) == 1 && $modules[0] instanceof ApiMain &&
+                       $options['recursivesubmodules'] && $context->getLanguage() === $wgContLang
+               ) {
+                       $cacheHelpTimeout = $context->getConfig()->get( 'APICacheHelpTimeout' );
+                       if ( $cacheHelpTimeout > 0 ) {
+                               // Get help text from cache if present
+                               $cacheKey = $cache->makeKey( 'apihelp', $modules[0]->getModulePath(),
+                                       (int)!empty( $options['toc'] ),
+                                       str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
+                               $cached = $cache->get( $cacheKey );
+                               if ( $cached ) {
+                                       $out->addHTML( $cached );
+                                       return;
                                }
-                               $module = new $modArr[$m]( $this->getMain(), $m );
+                       }
+               }
+               if ( $out->getHTML() !== '' ) {
+                       // Don't save to cache, there's someone else's content in the page
+                       // already
+                       $cacheKey = null;
+               }
 
-                               $r[] = $this->buildModuleHelp( $module, 'action' );
+               $options['recursivesubmodules'] = !empty( $options['recursivesubmodules'] );
+               $options['submodules'] = $options['recursivesubmodules'] || !empty( $options['submodules'] );
+
+               // Prepend lead
+               if ( empty( $options['nolead'] ) ) {
+                       $msg = $context->msg( 'api-help-lead' );
+                       if ( !$msg->isDisabled() ) {
+                               $out->addHTML( $msg->parseAsBlock() );
                        }
                }
 
-               if ( is_array( $params['querymodules'] ) ) {
-                       $qmodArr = $queryObj->getModules();
+               $haveModules = [];
+               $html = self::getHelpInternal( $context, $modules, $options, $haveModules );
+               if ( !empty( $options['toc'] ) && $haveModules ) {
+                       $out->addHTML( Linker::generateTOC( $haveModules, $context->getLanguage() ) );
+               }
+               $out->addHTML( $html );
 
-                       foreach ( $params['querymodules'] as $qm ) {
-                               if ( !isset( $qmodArr[$qm] ) ) {
-                                       $r[] = array( 'name' => $qm, 'missing' => '' );
-                                       continue;
-                               }
-                               $module = new $qmodArr[$qm]( $this, $qm );
-                               $type = $queryObj->getModuleType( $qm );
+               $helptitle = isset( $options['helptitle'] ) ? $options['helptitle'] : null;
+               $html = self::fixHelpLinks( $out->getHTML(), $helptitle, $haveModules );
+               $out->clearHTML();
+               $out->addHTML( $html );
 
-                               if ( $type === null ) {
-                                       $r[] = array( 'name' => $qm, 'missing' => '' );
-                                       continue;
-                               }
+               if ( $cacheKey !== null ) {
+                       $cache->set( $cacheKey, $out->getHTML(), $cacheHelpTimeout );
+               }
+       }
 
-                               $r[] = $this->buildModuleHelp( $module, $type );
+       /**
+        * Replace Special:ApiHelp links with links to api.php
+        *
+        * @param string $html
+        * @param string|null $helptitle Title to link to rather than api.php, must contain '$1'
+        * @param array $localModules Keys are modules to link within the current page, values are ignored
+        * @return string
+        */
+       public static function fixHelpLinks( $html, $helptitle = null, $localModules = [] ) {
+               $formatter = new HtmlFormatter( $html );
+               $doc = $formatter->getDoc();
+               $xpath = new DOMXPath( $doc );
+               $nodes = $xpath->query( '//a[@href][not(contains(@class,\'apihelp-linktrail\'))]' );
+               foreach ( $nodes as $node ) {
+                       $href = $node->getAttribute( 'href' );
+                       do {
+                               $old = $href;
+                               $href = rawurldecode( $href );
+                       } while ( $old !== $href );
+                       if ( preg_match( '!Special:ApiHelp/([^&/|#]+)((?:#.*)?)!', $href, $m ) ) {
+                               if ( isset( $localModules[$m[1]] ) ) {
+                                       $href = $m[2] === '' ? '#' . $m[1] : $m[2];
+                               } elseif ( $helptitle !== null ) {
+                                       $href = Title::newFromText( str_replace( '$1', $m[1], $helptitle ) . $m[2] )
+                                               ->getFullURL();
+                               } else {
+                                       $href = wfAppendQuery( wfScript( 'api' ), [
+                                               'action' => 'help',
+                                               'modules' => $m[1],
+                                       ] ) . $m[2];
+                               }
+                               $node->setAttribute( 'href', $href );
+                               $node->removeAttribute( 'title' );
                        }
                }
-               $result->setIndexedTagName( $r, 'module' );
-               $result->addValue( null, $this->getModuleName(), $r );
+
+               return $formatter->getText();
+       }
+
+       /**
+        * Wrap a message in HTML with a class.
+        *
+        * @param Message $msg
+        * @param string $class
+        * @param string $tag
+        * @return string
+        */
+       private static function wrap( Message $msg, $class, $tag = 'span' ) {
+               return Html::rawElement( $tag, [ 'class' => $class ],
+                       $msg->parse()
+               );
        }
 
-       private function buildModuleHelp( $module, $type ) {
-               $msg = ApiMain::makeHelpMsgHeader( $module, $type );
+       /**
+        * Recursively-called function to actually construct the help
+        *
+        * @param IContextSource $context
+        * @param ApiBase[] $modules
+        * @param array $options
+        * @param array &$haveModules
+        * @return string
+        */
+       private static function getHelpInternal( IContextSource $context, array $modules,
+               array $options, &$haveModules
+       ) {
+               $out = '';
+
+               $level = empty( $options['headerlevel'] ) ? 2 : $options['headerlevel'];
+               if ( empty( $options['tocnumber'] ) ) {
+                       $tocnumber = [ 2 => 0 ];
+               } else {
+                       $tocnumber = &$options['tocnumber'];
+               }
+
+               foreach ( $modules as $module ) {
+                       $tocnumber[$level]++;
+                       $path = $module->getModulePath();
+                       $module->setContext( $context );
+                       $help = [
+                               'header' => '',
+                               'flags' => '',
+                               'description' => '',
+                               'help-urls' => '',
+                               'parameters' => '',
+                               'examples' => '',
+                               'submodules' => '',
+                       ];
+
+                       if ( empty( $options['noheader'] ) || !empty( $options['toc'] ) ) {
+                               $anchor = $path;
+                               $i = 1;
+                               while ( isset( $haveModules[$anchor] ) ) {
+                                       $anchor = $path . '|' . ++$i;
+                               }
+
+                               if ( $module->isMain() ) {
+                                       $headerContent = $context->msg( 'api-help-main-header' )->parse();
+                                       $headerAttr = [
+                                               'class' => 'apihelp-header',
+                                       ];
+                               } else {
+                                       $name = $module->getModuleName();
+                                       $headerContent = $module->getParent()->getModuleManager()->getModuleGroup( $name ) .
+                                               "=$name";
+                                       if ( $module->getModulePrefix() !== '' ) {
+                                               $headerContent .= ' ' .
+                                                       $context->msg( 'parentheses', $module->getModulePrefix() )->parse();
+                                       }
+                                       // Module names are always in English and not localized,
+                                       // so English language and direction must be set explicitly,
+                                       // otherwise parentheses will get broken in RTL wikis
+                                       $headerAttr = [
+                                               'class' => 'apihelp-header apihelp-module-name',
+                                               'dir' => 'ltr',
+                                               'lang' => 'en',
+                                       ];
+                               }
+
+                               $headerAttr['id'] = $anchor;
+
+                               $haveModules[$anchor] = [
+                                       'toclevel' => count( $tocnumber ),
+                                       'level' => $level,
+                                       'anchor' => $anchor,
+                                       'line' => $headerContent,
+                                       'number' => implode( '.', $tocnumber ),
+                                       'index' => false,
+                               ];
+                               if ( empty( $options['noheader'] ) ) {
+                                       $help['header'] .= Html::element(
+                                               'h' . min( 6, $level ),
+                                               $headerAttr,
+                                               $headerContent
+                                       );
+                               }
+                       } else {
+                               $haveModules[$path] = true;
+                       }
+
+                       $links = [];
+                       $any = false;
+                       for ( $m = $module; $m !== null; $m = $m->getParent() ) {
+                               $name = $m->getModuleName();
+                               if ( $name === 'main_int' ) {
+                                       $name = 'main';
+                               }
+
+                               if ( count( $modules ) === 1 && $m === $modules[0] &&
+                                       !( !empty( $options['submodules'] ) && $m->getModuleManager() )
+                               ) {
+                                       $link = Html::element( 'b', [ 'dir' => 'ltr', 'lang' => 'en' ], $name );
+                               } else {
+                                       $link = SpecialPage::getTitleFor( 'ApiHelp', $m->getModulePath() )->getLocalURL();
+                                       $link = Html::element( 'a',
+                                               [ 'href' => $link, 'class' => 'apihelp-linktrail', 'dir' => 'ltr', 'lang' => 'en' ],
+                                               $name
+                                       );
+                                       $any = true;
+                               }
+                               array_unshift( $links, $link );
+                       }
+                       if ( $any ) {
+                               $help['header'] .= self::wrap(
+                                       $context->msg( 'parentheses' )
+                                               ->rawParams( $context->getLanguage()->pipeList( $links ) ),
+                                       'apihelp-linktrail', 'div'
+                               );
+                       }
+
+                       $flags = $module->getHelpFlags();
+                       $help['flags'] .= Html::openElement( 'div',
+                               [ 'class' => 'apihelp-block apihelp-flags' ] );
+                       $msg = $context->msg( 'api-help-flags' );
+                       if ( !$msg->isDisabled() ) {
+                               $help['flags'] .= self::wrap(
+                                       $msg->numParams( count( $flags ) ), 'apihelp-block-head', 'div'
+                               );
+                       }
+                       $help['flags'] .= Html::openElement( 'ul' );
+                       foreach ( $flags as $flag ) {
+                               $help['flags'] .= Html::rawElement( 'li', null,
+                                       self::wrap( $context->msg( "api-help-flag-$flag" ), "apihelp-flag-$flag" )
+                               );
+                       }
+                       $sourceInfo = $module->getModuleSourceInfo();
+                       if ( $sourceInfo ) {
+                               if ( isset( $sourceInfo['namemsg'] ) ) {
+                                       $extname = $context->msg( $sourceInfo['namemsg'] )->text();
+                               } else {
+                                       // Probably English, so wrap it.
+                                       $extname = Html::element( 'span', [ 'dir' => 'ltr', 'lang' => 'en' ], $sourceInfo['name'] );
+                               }
+                               $help['flags'] .= Html::rawElement( 'li', null,
+                                       self::wrap(
+                                               $context->msg( 'api-help-source', $extname, $sourceInfo['name'] ),
+                                               'apihelp-source'
+                                       )
+                               );
+
+                               $link = SpecialPage::getTitleFor( 'Version', 'License/' . $sourceInfo['name'] );
+                               if ( isset( $sourceInfo['license-name'] ) ) {
+                                       $msg = $context->msg( 'api-help-license', $link,
+                                               Html::element( 'span', [ 'dir' => 'ltr', 'lang' => 'en' ], $sourceInfo['license-name'] )
+                                       );
+                               } elseif ( SpecialVersion::getExtLicenseFileName( dirname( $sourceInfo['path'] ) ) ) {
+                                       $msg = $context->msg( 'api-help-license-noname', $link );
+                               } else {
+                                       $msg = $context->msg( 'api-help-license-unknown' );
+                               }
+                               $help['flags'] .= Html::rawElement( 'li', null,
+                                       self::wrap( $msg, 'apihelp-license' )
+                               );
+                       } else {
+                               $help['flags'] .= Html::rawElement( 'li', null,
+                                       self::wrap( $context->msg( 'api-help-source-unknown' ), 'apihelp-source' )
+                               );
+                               $help['flags'] .= Html::rawElement( 'li', null,
+                                       self::wrap( $context->msg( 'api-help-license-unknown' ), 'apihelp-license' )
+                               );
+                       }
+                       $help['flags'] .= Html::closeElement( 'ul' );
+                       $help['flags'] .= Html::closeElement( 'div' );
+
+                       foreach ( $module->getFinalDescription() as $msg ) {
+                               $msg->setContext( $context );
+                               $help['description'] .= $msg->parseAsBlock();
+                       }
+
+                       $urls = $module->getHelpUrls();
+                       if ( $urls ) {
+                               $help['help-urls'] .= Html::openElement( 'div',
+                                       [ 'class' => 'apihelp-block apihelp-help-urls' ]
+                               );
+                               $msg = $context->msg( 'api-help-help-urls' );
+                               if ( !$msg->isDisabled() ) {
+                                       $help['help-urls'] .= self::wrap(
+                                               $msg->numParams( count( $urls ) ), 'apihelp-block-head', 'div'
+                                       );
+                               }
+                               if ( !is_array( $urls ) ) {
+                                       $urls = [ $urls ];
+                               }
+                               $help['help-urls'] .= Html::openElement( 'ul' );
+                               foreach ( $urls as $url ) {
+                                       $help['help-urls'] .= Html::rawElement( 'li', null,
+                                               Html::element( 'a', [ 'href' => $url, 'dir' => 'ltr' ], $url )
+                                       );
+                               }
+                               $help['help-urls'] .= Html::closeElement( 'ul' );
+                               $help['help-urls'] .= Html::closeElement( 'div' );
+                       }
+
+                       $params = $module->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
+                       $dynamicParams = $module->dynamicParameterDocumentation();
+                       $groups = [];
+                       if ( $params || $dynamicParams !== null ) {
+                               $help['parameters'] .= Html::openElement( 'div',
+                                       [ 'class' => 'apihelp-block apihelp-parameters' ]
+                               );
+                               $msg = $context->msg( 'api-help-parameters' );
+                               if ( !$msg->isDisabled() ) {
+                                       $help['parameters'] .= self::wrap(
+                                               $msg->numParams( count( $params ) ), 'apihelp-block-head', 'div'
+                                       );
+                               }
+                               $help['parameters'] .= Html::openElement( 'dl' );
+
+                               $descriptions = $module->getFinalParamDescription();
+
+                               foreach ( $params as $name => $settings ) {
+                                       if ( !is_array( $settings ) ) {
+                                               $settings = [ ApiBase::PARAM_DFLT => $settings ];
+                                       }
+
+                                       $help['parameters'] .= Html::rawElement( 'dt', null,
+                                               Html::element( 'span', [ 'dir' => 'ltr', 'lang' => 'en' ], $module->encodeParamName( $name ) )
+                                       );
+
+                                       // Add description
+                                       $description = [];
+                                       if ( isset( $descriptions[$name] ) ) {
+                                               foreach ( $descriptions[$name] as $msg ) {
+                                                       $msg->setContext( $context );
+                                                       $description[] = $msg->parseAsBlock();
+                                               }
+                                       }
+
+                                       // Add usage info
+                                       $info = [];
+
+                                       // Required?
+                                       if ( !empty( $settings[ApiBase::PARAM_REQUIRED] ) ) {
+                                               $info[] = $context->msg( 'api-help-param-required' )->parse();
+                                       }
+
+                                       // Custom info?
+                                       if ( !empty( $settings[ApiBase::PARAM_HELP_MSG_INFO] ) ) {
+                                               foreach ( $settings[ApiBase::PARAM_HELP_MSG_INFO] as $i ) {
+                                                       $tag = array_shift( $i );
+                                                       $info[] = $context->msg( "apihelp-{$path}-paraminfo-{$tag}" )
+                                                               ->numParams( count( $i ) )
+                                                               ->params( $context->getLanguage()->commaList( $i ) )
+                                                               ->params( $module->getModulePrefix() )
+                                                               ->parse();
+                                               }
+                                       }
+
+                                       // Type documentation
+                                       if ( !isset( $settings[ApiBase::PARAM_TYPE] ) ) {
+                                               $dflt = isset( $settings[ApiBase::PARAM_DFLT] )
+                                                       ? $settings[ApiBase::PARAM_DFLT]
+                                                       : null;
+                                               if ( is_bool( $dflt ) ) {
+                                                       $settings[ApiBase::PARAM_TYPE] = 'boolean';
+                                               } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
+                                                       $settings[ApiBase::PARAM_TYPE] = 'string';
+                                               } elseif ( is_int( $dflt ) ) {
+                                                       $settings[ApiBase::PARAM_TYPE] = 'integer';
+                                               }
+                                       }
+                                       if ( isset( $settings[ApiBase::PARAM_TYPE] ) ) {
+                                               $type = $settings[ApiBase::PARAM_TYPE];
+                                               $multi = !empty( $settings[ApiBase::PARAM_ISMULTI] );
+                                               $hintPipeSeparated = true;
+                                               $count = !empty( $settings[ApiBase::PARAM_ISMULTI_LIMIT2] )
+                                                       ? $settings[ApiBase::PARAM_ISMULTI_LIMIT2] + 1
+                                                       : ApiBase::LIMIT_SML2 + 1;
+
+                                               if ( is_array( $type ) ) {
+                                                       $count = count( $type );
+                                                       $deprecatedValues = isset( $settings[ApiBase::PARAM_DEPRECATED_VALUES] )
+                                                               ? $settings[ApiBase::PARAM_DEPRECATED_VALUES]
+                                                               : [];
+                                                       $links = isset( $settings[ApiBase::PARAM_VALUE_LINKS] )
+                                                               ? $settings[ApiBase::PARAM_VALUE_LINKS]
+                                                               : [];
+                                                       $values = array_map( function ( $v ) use ( $links, $deprecatedValues ) {
+                                                               $attr = [];
+                                                               if ( $v !== '' ) {
+                                                                       // We can't know whether this contains LTR or RTL text.
+                                                                       $attr['dir'] = 'auto';
+                                                               }
+                                                               if ( isset( $deprecatedValues[$v] ) ) {
+                                                                       $attr['class'] = 'apihelp-deprecated-value';
+                                                               }
+                                                               $ret = $attr ? Html::element( 'span', $attr, $v ) : $v;
+                                                               if ( isset( $links[$v] ) ) {
+                                                                       $ret = "[[{$links[$v]}|$ret]]";
+                                                               }
+                                                               return $ret;
+                                                       }, $type );
+                                                       $i = array_search( '', $type, true );
+                                                       if ( $i === false ) {
+                                                               $values = $context->getLanguage()->commaList( $values );
+                                                       } else {
+                                                               unset( $values[$i] );
+                                                               $values = $context->msg( 'api-help-param-list-can-be-empty' )
+                                                                       ->numParams( count( $values ) )
+                                                                       ->params( $context->getLanguage()->commaList( $values ) )
+                                                                       ->parse();
+                                                       }
+                                                       $info[] = $context->msg( 'api-help-param-list' )
+                                                               ->params( $multi ? 2 : 1 )
+                                                               ->params( $values )
+                                                               ->parse();
+                                                       $hintPipeSeparated = false;
+                                               } else {
+                                                       switch ( $type ) {
+                                                               case 'submodule':
+                                                                       $groups[] = $name;
+
+                                                                       if ( isset( $settings[ApiBase::PARAM_SUBMODULE_MAP] ) ) {
+                                                                               $map = $settings[ApiBase::PARAM_SUBMODULE_MAP];
+                                                                               $defaultAttrs = [];
+                                                                       } else {
+                                                                               $prefix = $module->isMain() ? '' : ( $module->getModulePath() . '+' );
+                                                                               $map = [];
+                                                                               foreach ( $module->getModuleManager()->getNames( $name ) as $submoduleName ) {
+                                                                                       $map[$submoduleName] = $prefix . $submoduleName;
+                                                                               }
+                                                                               $defaultAttrs = [ 'dir' => 'ltr', 'lang' => 'en' ];
+                                                                       }
+                                                                       ksort( $map );
+
+                                                                       $submodules = [];
+                                                                       $deprecatedSubmodules = [];
+                                                                       foreach ( $map as $v => $m ) {
+                                                                               $attrs = $defaultAttrs;
+                                                                               $arr = &$submodules;
+                                                                               try {
+                                                                                       $submod = $module->getModuleFromPath( $m );
+                                                                                       if ( $submod ) {
+                                                                                               if ( $submod->isDeprecated() ) {
+                                                                                                       $arr = &$deprecatedSubmodules;
+                                                                                                       $attrs['class'] = 'apihelp-deprecated-value';
+                                                                                               }
+                                                                                       }
+                                                                               } catch ( ApiUsageException $ex ) {
+                                                                                       // Ignore
+                                                                               }
+                                                                               if ( $attrs ) {
+                                                                                       $v = Html::element( 'span', $attrs, $v );
+                                                                               }
+                                                                               $arr[] = "[[Special:ApiHelp/{$m}|{$v}]]";
+                                                                       }
+                                                                       $submodules = array_merge( $submodules, $deprecatedSubmodules );
+                                                                       $count = count( $submodules );
+                                                                       $info[] = $context->msg( 'api-help-param-list' )
+                                                                               ->params( $multi ? 2 : 1 )
+                                                                               ->params( $context->getLanguage()->commaList( $submodules ) )
+                                                                               ->parse();
+                                                                       $hintPipeSeparated = false;
+                                                                       // No type message necessary, we have a list of values.
+                                                                       $type = null;
+                                                                       break;
+
+                                                               case 'namespace':
+                                                                       $namespaces = MWNamespace::getValidNamespaces();
+                                                                       if ( isset( $settings[ApiBase::PARAM_EXTRA_NAMESPACES] ) &&
+                                                                               is_array( $settings[ApiBase::PARAM_EXTRA_NAMESPACES] )
+                                                                       ) {
+                                                                               $namespaces = array_merge( $namespaces, $settings[ApiBase::PARAM_EXTRA_NAMESPACES] );
+                                                                       }
+                                                                       sort( $namespaces );
+                                                                       $count = count( $namespaces );
+                                                                       $info[] = $context->msg( 'api-help-param-list' )
+                                                                               ->params( $multi ? 2 : 1 )
+                                                                               ->params( $context->getLanguage()->commaList( $namespaces ) )
+                                                                               ->parse();
+                                                                       $hintPipeSeparated = false;
+                                                                       // No type message necessary, we have a list of values.
+                                                                       $type = null;
+                                                                       break;
+
+                                                               case 'tags':
+                                                                       $tags = ChangeTags::listExplicitlyDefinedTags();
+                                                                       $count = count( $tags );
+                                                                       $info[] = $context->msg( 'api-help-param-list' )
+                                                                               ->params( $multi ? 2 : 1 )
+                                                                               ->params( $context->getLanguage()->commaList( $tags ) )
+                                                                               ->parse();
+                                                                       $hintPipeSeparated = false;
+                                                                       $type = null;
+                                                                       break;
+
+                                                               case 'limit':
+                                                                       if ( isset( $settings[ApiBase::PARAM_MAX2] ) ) {
+                                                                               $info[] = $context->msg( 'api-help-param-limit2' )
+                                                                                       ->numParams( $settings[ApiBase::PARAM_MAX] )
+                                                                                       ->numParams( $settings[ApiBase::PARAM_MAX2] )
+                                                                                       ->parse();
+                                                                       } else {
+                                                                               $info[] = $context->msg( 'api-help-param-limit' )
+                                                                                       ->numParams( $settings[ApiBase::PARAM_MAX] )
+                                                                                       ->parse();
+                                                                       }
+                                                                       break;
+
+                                                               case 'integer':
+                                                                       // Possible messages:
+                                                                       // api-help-param-integer-min,
+                                                                       // api-help-param-integer-max,
+                                                                       // api-help-param-integer-minmax
+                                                                       $suffix = '';
+                                                                       $min = $max = 0;
+                                                                       if ( isset( $settings[ApiBase::PARAM_MIN] ) ) {
+                                                                               $suffix .= 'min';
+                                                                               $min = $settings[ApiBase::PARAM_MIN];
+                                                                       }
+                                                                       if ( isset( $settings[ApiBase::PARAM_MAX] ) ) {
+                                                                               $suffix .= 'max';
+                                                                               $max = $settings[ApiBase::PARAM_MAX];
+                                                                       }
+                                                                       if ( $suffix !== '' ) {
+                                                                               $info[] =
+                                                                                       $context->msg( "api-help-param-integer-$suffix" )
+                                                                                               ->params( $multi ? 2 : 1 )
+                                                                                               ->numParams( $min, $max )
+                                                                                               ->parse();
+                                                                       }
+                                                                       break;
+
+                                                               case 'upload':
+                                                                       $info[] = $context->msg( 'api-help-param-upload' )
+                                                                               ->parse();
+                                                                       // No type message necessary, api-help-param-upload should handle it.
+                                                                       $type = null;
+                                                                       break;
+
+                                                               case 'string':
+                                                               case 'text':
+                                                                       // Displaying a type message here would be useless.
+                                                                       $type = null;
+                                                                       break;
+                                                       }
+                                               }
+
+                                               // Add type. Messages for grep: api-help-param-type-limit
+                                               // api-help-param-type-integer api-help-param-type-boolean
+                                               // api-help-param-type-timestamp api-help-param-type-user
+                                               // api-help-param-type-password
+                                               if ( is_string( $type ) ) {
+                                                       $msg = $context->msg( "api-help-param-type-$type" );
+                                                       if ( !$msg->isDisabled() ) {
+                                                               $info[] = $msg->params( $multi ? 2 : 1 )->parse();
+                                                       }
+                                               }
+
+                                               if ( $multi ) {
+                                                       $extra = [];
+                                                       $lowcount = !empty( $settings[ApiBase::PARAM_ISMULTI_LIMIT1] )
+                                                               ? $settings[ApiBase::PARAM_ISMULTI_LIMIT1]
+                                                               : ApiBase::LIMIT_SML1;
+                                                       $highcount = !empty( $settings[ApiBase::PARAM_ISMULTI_LIMIT2] )
+                                                               ? $settings[ApiBase::PARAM_ISMULTI_LIMIT2]
+                                                               : ApiBase::LIMIT_SML2;
+
+                                                       if ( $hintPipeSeparated ) {
+                                                               $extra[] = $context->msg( 'api-help-param-multi-separate' )->parse();
+                                                       }
+                                                       if ( $count > $lowcount ) {
+                                                               if ( $lowcount === $highcount ) {
+                                                                       $msg = $context->msg( 'api-help-param-multi-max-simple' )
+                                                                               ->numParams( $lowcount );
+                                                               } else {
+                                                                       $msg = $context->msg( 'api-help-param-multi-max' )
+                                                                               ->numParams( $lowcount, $highcount );
+                                                               }
+                                                               $extra[] = $msg->parse();
+                                                       }
+                                                       if ( $extra ) {
+                                                               $info[] = implode( ' ', $extra );
+                                                       }
+
+                                                       $allowAll = isset( $settings[ApiBase::PARAM_ALL] )
+                                                               ? $settings[ApiBase::PARAM_ALL]
+                                                               : false;
+                                                       if ( $allowAll || $settings[ApiBase::PARAM_TYPE] === 'namespace' ) {
+                                                               if ( $settings[ApiBase::PARAM_TYPE] === 'namespace' ) {
+                                                                       $allSpecifier = ApiBase::ALL_DEFAULT_STRING;
+                                                               } else {
+                                                                       $allSpecifier = ( is_string( $allowAll ) ? $allowAll : ApiBase::ALL_DEFAULT_STRING );
+                                                               }
+                                                               $info[] = $context->msg( 'api-help-param-multi-all' )
+                                                                       ->params( $allSpecifier )
+                                                                       ->parse();
+                                                       }
+                                               }
+                                       }
 
-               $msg2 = $module->makeHelpMsg();
-               if ( $msg2 !== false ) {
-                       $msg .= $msg2;
+                                       // Add default
+                                       $default = isset( $settings[ApiBase::PARAM_DFLT] )
+                                               ? $settings[ApiBase::PARAM_DFLT]
+                                               : null;
+                                       if ( $default === '' ) {
+                                               $info[] = $context->msg( 'api-help-param-default-empty' )
+                                                       ->parse();
+                                       } elseif ( $default !== null && $default !== false ) {
+                                               // We can't know whether this contains LTR or RTL text.
+                                               $info[] = $context->msg( 'api-help-param-default' )
+                                                       ->params( Html::element( 'span', [ 'dir' => 'auto' ], $default ) )
+                                                       ->parse();
+                                       }
+
+                                       if ( !array_filter( $description ) ) {
+                                               $description = [ self::wrap(
+                                                       $context->msg( 'api-help-param-no-description' ),
+                                                       'apihelp-empty'
+                                               ) ];
+                                       }
+
+                                       // Add "deprecated" flag
+                                       if ( !empty( $settings[ApiBase::PARAM_DEPRECATED] ) ) {
+                                               $help['parameters'] .= Html::openElement( 'dd',
+                                                       [ 'class' => 'info' ] );
+                                               $help['parameters'] .= self::wrap(
+                                                       $context->msg( 'api-help-param-deprecated' ),
+                                                       'apihelp-deprecated', 'strong'
+                                               );
+                                               $help['parameters'] .= Html::closeElement( 'dd' );
+                                       }
+
+                                       if ( $description ) {
+                                               $description = implode( '', $description );
+                                               $description = preg_replace( '!\s*</([oud]l)>\s*<\1>\s*!', "\n", $description );
+                                               $help['parameters'] .= Html::rawElement( 'dd',
+                                                       [ 'class' => 'description' ], $description );
+                                       }
+
+                                       foreach ( $info as $i ) {
+                                               $help['parameters'] .= Html::rawElement( 'dd', [ 'class' => 'info' ], $i );
+                                       }
+                               }
+
+                               if ( $dynamicParams !== null ) {
+                                       $dynamicParams = ApiBase::makeMessage( $dynamicParams, $context, [
+                                               $module->getModulePrefix(),
+                                               $module->getModuleName(),
+                                               $module->getModulePath()
+                                       ] );
+                                       $help['parameters'] .= Html::element( 'dt', null, '*' );
+                                       $help['parameters'] .= Html::rawElement( 'dd',
+                                               [ 'class' => 'description' ], $dynamicParams->parse() );
+                               }
+
+                               $help['parameters'] .= Html::closeElement( 'dl' );
+                               $help['parameters'] .= Html::closeElement( 'div' );
+                       }
+
+                       $examples = $module->getExamplesMessages();
+                       if ( $examples ) {
+                               $help['examples'] .= Html::openElement( 'div',
+                                       [ 'class' => 'apihelp-block apihelp-examples' ] );
+                               $msg = $context->msg( 'api-help-examples' );
+                               if ( !$msg->isDisabled() ) {
+                                       $help['examples'] .= self::wrap(
+                                               $msg->numParams( count( $examples ) ), 'apihelp-block-head', 'div'
+                                       );
+                               }
+
+                               $help['examples'] .= Html::openElement( 'dl' );
+                               foreach ( $examples as $qs => $msg ) {
+                                       $msg = ApiBase::makeMessage( $msg, $context, [
+                                               $module->getModulePrefix(),
+                                               $module->getModuleName(),
+                                               $module->getModulePath()
+                                       ] );
+
+                                       $link = wfAppendQuery( wfScript( 'api' ), $qs );
+                                       $sandbox = SpecialPage::getTitleFor( 'ApiSandbox' )->getLocalURL() . '#' . $qs;
+                                       $help['examples'] .= Html::rawElement( 'dt', null, $msg->parse() );
+                                       $help['examples'] .= Html::rawElement( 'dd', null,
+                                               Html::element( 'a', [ 'href' => $link, 'dir' => 'ltr' ], "api.php?$qs" ) . ' ' .
+                                               Html::rawElement( 'a', [ 'href' => $sandbox ],
+                                                       $context->msg( 'api-help-open-in-apisandbox' )->parse() )
+                                       );
+                               }
+                               $help['examples'] .= Html::closeElement( 'dl' );
+                               $help['examples'] .= Html::closeElement( 'div' );
+                       }
+
+                       $subtocnumber = $tocnumber;
+                       $subtocnumber[$level + 1] = 0;
+                       $suboptions = [
+                               'submodules' => $options['recursivesubmodules'],
+                               'headerlevel' => $level + 1,
+                               'tocnumber' => &$subtocnumber,
+                               'noheader' => false,
+                       ] + $options;
+
+                       if ( $options['submodules'] && $module->getModuleManager() ) {
+                               $manager = $module->getModuleManager();
+                               $submodules = [];
+                               foreach ( $groups as $group ) {
+                                       $names = $manager->getNames( $group );
+                                       sort( $names );
+                                       foreach ( $names as $name ) {
+                                               $submodules[] = $manager->getModule( $name );
+                                       }
+                               }
+                               $help['submodules'] .= self::getHelpInternal(
+                                       $context,
+                                       $submodules,
+                                       $suboptions,
+                                       $haveModules
+                               );
+                       }
+
+                       $module->modifyHelp( $help, $suboptions, $haveModules );
+
+                       Hooks::run( 'APIHelpModifyOutput', [ $module, &$help, $suboptions, &$haveModules ] );
+
+                       $out .= implode( "\n", $help );
                }
 
-               return $msg;
+               return $out;
        }
 
        public function shouldCheckMaxlag() {
@@ -112,44 +849,50 @@ class ApiHelp extends ApiBase {
                return false;
        }
 
-       public function getAllowedParams() {
-               return array(
-                       'modules' => array(
-                               ApiBase::PARAM_ISMULTI => true
-                       ),
-                       'querymodules' => array(
-                               ApiBase::PARAM_ISMULTI => true
-                       ),
-               );
-       }
+       public function getCustomPrinter() {
+               $params = $this->extractRequestParams();
+               if ( $params['wrap'] ) {
+                       return null;
+               }
 
-       public function getParamDescription() {
-               return array(
-                       'modules' => 'List of module names (value of the action= parameter)',
-                       'querymodules' => 'List of query module names (value of prop=, meta= or list= parameter)',
-               );
+               $main = $this->getMain();
+               $errorPrinter = $main->createPrinterByName( $main->getParameter( 'format' ) );
+               return new ApiFormatRaw( $main, $errorPrinter );
        }
 
-       public function getDescription() {
-               return 'Display this help screen. Or the help screen for the specified module';
+       public function getAllowedParams() {
+               return [
+                       'modules' => [
+                               ApiBase::PARAM_DFLT => 'main',
+                               ApiBase::PARAM_ISMULTI => true,
+                       ],
+                       'submodules' => false,
+                       'recursivesubmodules' => false,
+                       'wrap' => false,
+                       'toc' => false,
+               ];
        }
 
-       protected function getExamples() {
-               return array(
-                       'Whole help page:',
-                       '  api.php?action=help',
-                       'Module (action) help page:',
-                       '  api.php?action=help&modules=protect',
-                       'Query (list) modules help page:',
-                       '  api.php?action=help&querymodules=categorymembers',
-                       'Query (prop) modules help page:',
-                       '  api.php?action=help&querymodules=info',
-                       'Query (meta) modules help page:',
-                       '  api.php?action=help&querymodules=siteinfo',
-               );
+       protected function getExamplesMessages() {
+               return [
+                       'action=help'
+                               => 'apihelp-help-example-main',
+                       'action=help&modules=query&submodules=1'
+                               => 'apihelp-help-example-submodules',
+                       'action=help&recursivesubmodules=1'
+                               => 'apihelp-help-example-recursive',
+                       'action=help&modules=help'
+                               => 'apihelp-help-example-help',
+                       'action=help&modules=query+info|query+categorymembers'
+                               => 'apihelp-help-example-query',
+               ];
        }
 
-       public function getVersion() {
-               return __CLASS__ . ': $Id$';
+       public function getHelpUrls() {
+               return [
+                       'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Main_page',
+                       'https://www.mediawiki.org/wiki/Special:MyLanguage/API:FAQ',
+                       'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Quick_start_guide',
+               ];
        }
 }