includes/api/ApiHelp.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Aug 29, 2014
   6  *
   7  * Copyright © 2014 Brad Jorsch <bjorsch@wikimedia.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * Class to output help for an API module
  29  *
  30  * @since 1.25 completely rewritten
  31  * @ingroup API
  32  */
  33 class ApiHelp extends ApiBase {
  34         public function execute() {
  35                 global $wgContLang;
  36
  37                 $params = $this->extractRequestParams();
  38                 $modules = array();
  39
  40                 foreach ( $params['modules'] as $path ) {
  41                         $modules[] = $this->getModuleFromPath( $path );
  42                 }
  43
  44                 // Get the help
  45                 $context = new DerivativeContext( $this->getMain()->getContext() );
  46                 $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
  47                 $context->setLanguage( $this->getMain()->getLanguage() );
  48                 $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
  49                 $out = new OutputPage( $context );
  50                 $context->setOutput( $out );
  51
  52                 self::getHelp( $context, $modules, $params );
  53
  54                 // Grab the output from the skin
  55                 ob_start();
  56                 $context->getOutput()->output();
  57                 $html = ob_get_clean();
  58
  59                 $result = $this->getResult();
  60                 if ( $params['wrap'] ) {
  61                         $data = array(
  62                                 'mime' => 'text/html',
  63                                 'help' => $help,
  64                         );
  65                         $result->setSubelements( $data, 'help' );
  66                         $result->addValue( null, $this->getModuleName(), $data );
  67                 } else {
  68                         $result->reset();
  69                         $result->addValue( null, 'text', $html, ApiResult::NO_SIZE_CHECK );
  70                         $result->addValue( null, 'mime', 'text/html', ApiResult::NO_SIZE_CHECK );
  71                 }
  72         }
  73
  74         /**
  75          * Generate help for the specified modules
  76          *
  77          * Help is placed into the OutputPage object returned by
  78          * $context->getOutput().
  79          *
  80          * Recognized options include:
  81          *  - headerlevel: (int) Header tag level
  82          *  - nolead: (bool) Skip the inclusion of api-help-lead
  83          *  - noheader: (bool) Skip the inclusion of the top-level section headers
  84          *  - submodules: (bool) Include help for submodules of the current module
  85          *  - recursivesubmodules: (bool) Include help for submodules recursively
  86          *  - helptitle: (string) Title to link for additional modules' help. Should contain $1.
  87          *
  88          * @param IContextSource $context
  89          * @param ApiBase[]|ApiBase $modules
  90          * @param array $options Formatting options (described above)
  91          * @return string
  92          */
  93         public static function getHelp( IContextSource $context, $modules, array $options ) {
  94                 global $wgMemc, $wgContLang;
  95
  96                 if ( !is_array( $modules ) ) {
  97                         $modules = array( $modules );
  98                 }
  99
 100                 $out = $context->getOutput();
 101                 $out->addModules( 'mediawiki.apihelp' );
 102                 $out->setPageTitle( $context->msg( 'api-help-title' ) );
 103
 104                 $cacheKey = null;
 105                 if ( count( $modules ) == 1 && $modules[0] instanceof ApiMain &&
 106                         $options['recursivesubmodules'] && $context->getLanguage() === $wgContLang
 107                 ) {
 108                         $cacheHelpTimeout = $context->getConfig()->get( 'APICacheHelpTimeout' );
 109                         if ( $cacheHelpTimeout > 0 ) {
 110                                 // Get help text from cache if present
 111                                 $cacheKey = wfMemcKey( 'apihelp', $modules[0]->getModulePath(),
 112                                         str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
 113                                 $cached = $wgMemc->get( $cacheKey );
 114                                 if ( $cached ) {
 115                                         $out->addHTML( $cached );
 116                                         return;
 117                                 }
 118                         }
 119                 }
 120                 if ( $out->getHTML() !== '' ) {
 121                         // Don't save to cache, there's someone else's content in the page
 122                         // already
 123                         $cacheKey = null;
 124                 }
 125
 126                 $options['recursivesubmodules'] = !empty( $options['recursivesubmodules'] );
 127                 $options['submodules'] = $options['recursivesubmodules'] || !empty( $options['submodules'] );
 128
 129                 // Prepend lead
 130                 if ( empty( $options['nolead'] ) ) {
 131                         $msg = $context->msg( 'api-help-lead' );
 132                         if ( !$msg->isDisabled() ) {
 133                                 $out->addHTML( $msg->parseAsBlock() );
 134                         }
 135                 }
 136
 137                 $haveModules = array();
 138                 $out->addHTML( self::getHelpInternal( $context, $modules, $options, $haveModules ) );
 139
 140                 $helptitle = isset( $options['helptitle'] ) ? $options['helptitle'] : null;
 141                 $html = self::fixHelpLinks( $out->getHTML(), $helptitle, $haveModules );
 142                 $out->clearHTML();
 143                 $out->addHTML( $html );
 144
 145                 if ( $cacheKey !== null ) {
 146                         $wgMemc->set( $cacheKey, $out->getHTML(), $cacheHelpTimeout );
 147                 }
 148         }
 149
 150         /**
 151          * Replace Special:ApiHelp links with links to api.php
 152          *
 153          * @param string $html
 154          * @param string|null $helptitle Title to link to rather than api.php, must contain '$1'
 155          * @param array $localModules Modules to link within the current page
 156          * @return string
 157          */
 158         public static function fixHelpLinks( $html, $helptitle = null, $localModules = array() ) {
 159                 $formatter = new HtmlFormatter( $html );
 160                 $doc = $formatter->getDoc();
 161                 $xpath = new DOMXPath( $doc );
 162                 $nodes = $xpath->query( '//a[@href][not(contains(@class,\'apihelp-linktrail\'))]' );
 163                 foreach ( $nodes as $node ) {
 164                         $href = $node->getAttribute( 'href' );
 165                         do {
 166                                 $old = $href;
 167                                 $href = rawurldecode( $href );
 168                         } while ( $old !== $href );
 169                         if ( preg_match( '!Special:ApiHelp/([^&/|]+)!', $href, $m ) ) {
 170                                 if ( isset( $localModules[$m[1]] ) ) {
 171                                         $href = '#' . $m[1];
 172                                 } elseif ( $helptitle !== null ) {
 173                                         $href = Title::newFromText( str_replace( '$1', $m[1], $helptitle ) )
 174                                                 ->getFullUrl();
 175                                 } else {
 176                                         $href = wfAppendQuery( wfScript( 'api' ), array(
 177                                                 'action' => 'help',
 178                                                 'modules' => $m[1],
 179                                         ) );
 180                                 }
 181                                 $node->setAttribute( 'href', $href );
 182                                 $node->removeAttribute( 'title' );
 183                         }
 184                 }
 185
 186                 return $formatter->getText();
 187         }
 188
 189         /**
 190          * Wrap a message in HTML with a class.
 191          *
 192          * @param Message $msg
 193          * @param string $class
 194          * @param string $tag
 195          * @return string
 196          */
 197         private static function wrap( Message $msg, $class, $tag = 'span' ) {
 198                 return Html::rawElement( $tag, array( 'class' => $class ),
 199                         $msg->parse()
 200                 );
 201         }
 202
 203         /**
 204          * Recursively-called function to actually construct the help
 205          *
 206          * @param IContextSource $context
 207          * @param ApiBase[] $modules
 208          * @param array $options
 209          * @param array &$haveModules
 210          * @return string
 211          */
 212         private static function getHelpInternal( IContextSource $context, array $modules,
 213                 array $options, &$haveModules
 214         ) {
 215                 $out = '';
 216
 217                 $level = min( 6, empty( $options['headerlevel'] ) ? 2 : $options['headerlevel'] );
 218                 $options['headerlevel'] = $level;
 219
 220                 foreach ( $modules as $module ) {
 221                         $haveModules[$module->getModulePath()] = true;
 222                         $module->setContext( $context );
 223                         $help = array(
 224                                 'header' => '',
 225                                 'flags' => '',
 226                                 'description' => '',
 227                                 'help-urls' => '',
 228                                 'parameters' => '',
 229                                 'examples' => '',
 230                                 'submodules' => '',
 231                         );
 232
 233                         if ( empty( $options['noheader'] ) ) {
 234                                 $path = $module->getModulePath();
 235                                 if ( $module->isMain() ) {
 236                                         $header = $context->msg( 'api-help-main-header' )->parse();
 237                                 } else {
 238                                         $name = $module->getModuleName();
 239                                         $header = $module->getParent()->getModuleManager()->getModuleGroup( $name ) .
 240                                                 "=$name";
 241                                         if ( $module->getModulePrefix() !== '' ) {
 242                                                 $header .= ' ' .
 243                                                         $context->msg( 'parentheses', $module->getModulePrefix() )->parse();
 244                                         }
 245                                 }
 246                                 $help['header'] .= Html::element( "h$level",
 247                                         array( 'id' => $path, 'class' => 'apihelp-header' ),
 248                                         $header
 249                                 );
 250                         }
 251
 252                         $links = array();
 253                         $any = false;
 254                         for ( $m = $module; $m !== null; $m = $m->getParent() ) {
 255                                 $name = $m->getModuleName();
 256                                 if ( $name === 'main_int' ) {
 257                                         $name = 'main';
 258                                 }
 259
 260                                 if ( count( $modules ) === 1 && $m === $modules[0] &&
 261                                         !( !empty( $options['submodules'] ) && $m->getModuleManager() )
 262                                 ) {
 263                                         $link = Html::element( 'b', null, $name );
 264                                 } else {
 265                                         $link = SpecialPage::getTitleFor( 'ApiHelp', $m->getModulePath() )->getLocalURL();
 266                                         $link = Html::element( 'a',
 267                                                 array( 'href' => $link, 'class' => 'apihelp-linktrail' ),
 268                                                 $name
 269                                         );
 270                                         $any = true;
 271                                 }
 272                                 array_unshift( $links, $link );
 273                         }
 274                         if ( $any ) {
 275                                 $help['header'] .= self::wrap(
 276                                         $context->msg( 'parentheses' )
 277                                                 ->rawParams( $context->getLanguage()->pipeList( $links ) ),
 278                                         'apihelp-linktrail', 'div'
 279                                 );
 280                         }
 281
 282                         $flags = $module->getHelpFlags();
 283                         if ( $flags ) {
 284                                 $help['flags'] .= Html::openElement( 'div',
 285                                         array( 'class' => 'apihelp-block apihelp-flags' ) );
 286                                 $msg = $context->msg( 'api-help-flags' );
 287                                 if ( !$msg->isDisabled() ) {
 288                                         $help['flags'] .= self::wrap(
 289                                                 $msg->numParams( count( $flags ) ), 'apihelp-block-head', 'div'
 290                                         );
 291                                 }
 292                                 $help['flags'] .= Html::openElement( 'ul' );
 293                                 foreach ( $flags as $flag ) {
 294                                         $help['flags'] .= Html::rawElement( 'li', null,
 295                                                 self::wrap( $context->msg( "api-help-flag-$flag" ), "apihelp-flag-$flag" )
 296                                         );
 297                                 }
 298                                 $help['flags'] .= Html::closeElement( 'ul' );
 299                                 $help['flags'] .= Html::closeElement( 'div' );
 300                         }
 301
 302                         foreach ( $module->getFinalDescription() as $msg ) {
 303                                 $msg->setContext( $context );
 304                                 $help['description'] .= $msg->parseAsBlock();
 305                         }
 306
 307                         $urls = $module->getHelpUrls();
 308                         if ( $urls ) {
 309                                 $help['help-urls'] .= Html::openElement( 'div',
 310                                         array( 'class' => 'apihelp-block apihelp-help-urls' )
 311                                 );
 312                                 $msg = $context->msg( 'api-help-help-urls' );
 313                                 if ( !$msg->isDisabled() ) {
 314                                         $help['help-urls'] .= self::wrap(
 315                                                 $msg->numParams( count( $urls ) ), 'apihelp-block-head', 'div'
 316                                         );
 317                                 }
 318                                 if ( !is_array( $urls ) ) {
 319                                         $urls = array( $urls );
 320                                 }
 321                                 $help['help-urls'] .= Html::openElement( 'ul' );
 322                                 foreach ( $urls as $url ) {
 323                                         $help['help-urls'] .= Html::rawElement( 'li', null,
 324                                                 Html::element( 'a', array( 'href' => $url ), $url )
 325                                         );
 326                                 }
 327                                 $help['help-urls'] .= Html::closeElement( 'ul' );
 328                                 $help['help-urls'] .= Html::closeElement( 'div' );
 329                         }
 330
 331                         $params = $module->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
 332                         $groups = array();
 333                         if ( $params ) {
 334                                 $help['parameters'] .= Html::openElement( 'div',
 335                                         array( 'class' => 'apihelp-block apihelp-parameters' )
 336                                 );
 337                                 $msg = $context->msg( 'api-help-parameters' );
 338                                 if ( !$msg->isDisabled() ) {
 339                                         $help['parameters'] .= self::wrap(
 340                                                 $msg->numParams( count( $params ) ), 'apihelp-block-head', 'div'
 341                                         );
 342                                 }
 343                                 $help['parameters'] .= Html::openElement( 'dl' );
 344
 345                                 $descriptions = $module->getFinalParamDescription();
 346
 347                                 foreach ( $params as $name => $settings ) {
 348                                         if ( !is_array( $settings ) ) {
 349                                                 $settings = array( ApiBase::PARAM_DFLT => $settings );
 350                                         }
 351
 352                                         $help['parameters'] .= Html::element( 'dt', null,
 353                                                 $module->encodeParamName( $name ) );
 354
 355                                         // Add description
 356                                         $description = array();
 357                                         if ( isset( $descriptions[$name] ) ) {
 358                                                 foreach ( $descriptions[$name] as $msg ) {
 359                                                         $msg->setContext( $context );
 360                                                         $description[] = $msg->parseAsBlock();
 361                                                 }
 362                                         }
 363
 364                                         // Add usage info
 365                                         $info = array();
 366
 367                                         // Required?
 368                                         if ( !empty( $settings[ApiBase::PARAM_REQUIRED] ) ) {
 369                                                 $info[] = $context->msg( 'api-help-param-required' )->parse();
 370                                         }
 371
 372                                         // Custom info?
 373                                         if ( !empty( $settings[ApiBase::PARAM_HELP_MSG_INFO] ) ) {
 374                                                 foreach ( $settings[ApiBase::PARAM_HELP_MSG_INFO] as $i ) {
 375                                                         $tag = array_shift( $i );
 376                                                         $info[] = $context->msg( "apihelp-{$path}-paraminfo-{$tag}" )
 377                                                                 ->numParams( count( $i ) )
 378                                                                 ->params( $context->getLanguage()->commaList( $i ) )
 379                                                                 ->parse();
 380                                                 }
 381                                         }
 382
 383                                         // Type documentation
 384                                         if ( !isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 385                                                 $dflt = isset( $settings[ApiBase::PARAM_DFLT] )
 386                                                         ? $settings[ApiBase::PARAM_DFLT]
 387                                                         : null;
 388                                                 if ( is_bool( $dflt ) ) {
 389                                                         $settings[ApiBase::PARAM_TYPE] = 'boolean';
 390                                                 } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
 391                                                         $settings[ApiBase::PARAM_TYPE] = 'string';
 392                                                 } elseif ( is_int( $dflt ) ) {
 393                                                         $settings[ApiBase::PARAM_TYPE] = 'integer';
 394                                                 }
 395                                         }
 396                                         if ( isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 397                                                 $type = $settings[ApiBase::PARAM_TYPE];
 398                                                 $multi = !empty( $settings[ApiBase::PARAM_ISMULTI] );
 399                                                 $hintPipeSeparated = true;
 400                                                 $count = ApiBase::LIMIT_SML2 + 1;
 401
 402                                                 if ( is_array( $type ) ) {
 403                                                         $count = count( $type );
 404                                                         $links = isset( $settings[ApiBase::PARAM_VALUE_LINKS] )
 405                                                                 ? $settings[ApiBase::PARAM_VALUE_LINKS]
 406                                                                 : array();
 407                                                         $type = array_map( function ( $v ) use ( $links ) {
 408                                                                 $ret = wfEscapeWikiText( $v );
 409                                                                 if ( isset( $links[$v] ) ) {
 410                                                                         $ret = "[[{$links[$v]}|$ret]]";
 411                                                                 }
 412                                                                 return $ret;
 413                                                         }, $type );
 414                                                         $i = array_search( '', $type, true );
 415                                                         if ( $i === false ) {
 416                                                                 $type = $context->getLanguage()->commaList( $type );
 417                                                         } else {
 418                                                                 unset( $type[$i] );
 419                                                                 $type = $context->msg( 'api-help-param-list-can-be-empty' )
 420                                                                         ->numParams( count( $type ) )
 421                                                                         ->params( $context->getLanguage()->commaList( $type ) )
 422                                                                         ->parse();
 423                                                         }
 424                                                         $info[] = $context->msg( 'api-help-param-list' )
 425                                                                 ->params( $multi ? 2 : 1 )
 426                                                                 ->params( $type )
 427                                                                 ->parse();
 428                                                         $hintPipeSeparated = false;
 429                                                 } else {
 430                                                         switch ( $type ) {
 431                                                                 case 'submodule':
 432                                                                         $groups[] = $name;
 433                                                                         $submodules = $module->getModuleManager()->getNames( $name );
 434                                                                         $count = count( $submodules );
 435                                                                         sort( $submodules );
 436                                                                         $prefix = $module->isMain()
 437                                                                                 ? '' : ( $module->getModulePath() . '+' );
 438                                                                         $submodules = array_map( function ( $name ) use ( $prefix ) {
 439                                                                                 return "[[Special:ApiHelp/{$prefix}{$name}|{$name}]]";
 440                                                                         }, $submodules );
 441                                                                         $info[] = $context->msg( 'api-help-param-list' )
 442                                                                                 ->params( $multi ? 2 : 1 )
 443                                                                                 ->params( $context->getLanguage()->commaList( $submodules ) )
 444                                                                                 ->parse();
 445                                                                         $hintPipeSeparated = false;
 446                                                                         break;
 447
 448                                                                 case 'namespace':
 449                                                                         $namespaces = MWNamespace::getValidNamespaces();
 450                                                                         $count = count( $namespaces );
 451                                                                         $info[] = $context->msg( 'api-help-param-list' )
 452                                                                                 ->params( $multi ? 2 : 1 )
 453                                                                                 ->params( $context->getLanguage()->commaList( $namespaces ) )
 454                                                                                 ->parse();
 455                                                                         $hintPipeSeparated = false;
 456                                                                         break;
 457
 458                                                                 case 'limit':
 459                                                                         if ( isset( $settings[ApiBase::PARAM_MAX2] ) ) {
 460                                                                                 $info[] = $context->msg( 'api-help-param-limit2' )
 461                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 462                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX2] )
 463                                                                                         ->parse();
 464                                                                         } else {
 465                                                                                 $info[] = $context->msg( 'api-help-param-limit' )
 466                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 467                                                                                         ->parse();
 468                                                                         }
 469                                                                         break;
 470
 471                                                                 case 'integer':
 472                                                                         // Possible messages:
 473                                                                         // api-help-param-integer-min,
 474                                                                         // api-help-param-integer-max,
 475                                                                         // api-help-param-integer-minmax
 476                                                                         $suffix = '';
 477                                                                         $min = $max = 0;
 478                                                                         if ( isset( $settings[ApiBase::PARAM_MIN] ) ) {
 479                                                                                 $suffix .= 'min';
 480                                                                                 $min = $settings[ApiBase::PARAM_MIN];
 481                                                                         }
 482                                                                         if ( isset( $settings[ApiBase::PARAM_MAX] ) ) {
 483                                                                                 $suffix .= 'max';
 484                                                                                 $max = $settings[ApiBase::PARAM_MAX];
 485                                                                         }
 486                                                                         if ( $suffix !== '' ) {
 487                                                                                 $info[] =
 488                                                                                         $context->msg( "api-help-param-integer-$suffix" )
 489                                                                                                 ->params( $multi ? 2 : 1 )
 490                                                                                                 ->numParams( $min, $max )
 491                                                                                                 ->parse();
 492                                                                         }
 493                                                                         break;
 494
 495                                                                 case 'upload':
 496                                                                         $info[] = $context->msg( 'api-help-param-upload' )
 497                                                                                 ->parse();
 498                                                                         break;
 499                                                         }
 500                                                 }
 501
 502                                                 if ( $multi ) {
 503                                                         $extra = array();
 504                                                         if ( $hintPipeSeparated ) {
 505                                                                 $extra[] = $context->msg( 'api-help-param-multi-separate' )->parse();
 506                                                         }
 507                                                         if ( $count > ApiBase::LIMIT_SML1 ) {
 508                                                                 $extra[] = $context->msg( 'api-help-param-multi-max' )
 509                                                                         ->numParams( ApiBase::LIMIT_SML1, ApiBase::LIMIT_SML2 )
 510                                                                         ->parse();
 511                                                         }
 512                                                         if ( $extra ) {
 513                                                                 $info[] = join( ' ', $extra );
 514                                                         }
 515                                                 }
 516                                         }
 517
 518                                         // Add default
 519                                         $default = isset( $settings[ApiBase::PARAM_DFLT] )
 520                                                 ? $settings[ApiBase::PARAM_DFLT]
 521                                                 : null;
 522                                         if ( $default === '' ) {
 523                                                 $info[] = $context->msg( 'api-help-param-default-empty' )
 524                                                         ->parse();
 525                                         } elseif ( $default !== null && $default !== false ) {
 526                                                 $info[] = $context->msg( 'api-help-param-default' )
 527                                                         ->params( wfEscapeWikiText( $default ) )
 528                                                         ->parse();
 529                                         }
 530
 531                                         if ( !$description && !$info ) {
 532                                                 $description[] = self::wrap(
 533                                                         $context->msg( 'api-help-param-no-description' ),
 534                                                         'apihelp-empty'
 535                                                 );
 536                                         }
 537
 538                                         // Add "deprecated" flag
 539                                         if ( !empty( $settings[ApiBase::PARAM_DEPRECATED] ) ) {
 540                                                 $help['parameters'] .= Html::openElement( 'dd',
 541                                                         array( 'class' => 'info' ) );
 542                                                 $help['parameters'] .= self::wrap(
 543                                                         $context->msg( 'api-help-param-deprecated' ),
 544                                                         'apihelp-deprecated', 'strong'
 545                                                 );
 546                                                 $help['parameters'] .= Html::closeElement( 'dd' );
 547                                         }
 548
 549                                         if ( $description ) {
 550                                                 $help['parameters'] .= Html::openElement( 'dd',
 551                                                         array( 'class' => 'description' ) );
 552                                                 $help['parameters'] .= join( '', $description );
 553                                                 $help['parameters'] .= Html::closeElement( 'dd' );
 554                                         }
 555
 556                                         foreach ( $info as $i ) {
 557                                                 $help['parameters'] .= Html::rawElement( 'dd', array( 'class' => 'info' ), $i );
 558                                         }
 559                                 }
 560
 561                                 $help['parameters'] .= Html::closeElement( 'dl' );
 562                                 $help['parameters'] .= Html::closeElement( 'div' );
 563                         }
 564
 565                         $examples = $module->getExamplesMessages();
 566                         if ( $examples ) {
 567                                 $help['examples'] .= Html::openElement( 'div',
 568                                         array( 'class' => 'apihelp-block apihelp-examples' ) );
 569                                 $msg = $context->msg( 'api-help-examples' );
 570                                 if ( !$msg->isDisabled() ) {
 571                                         $help['examples'] .= self::wrap(
 572                                                 $msg->numParams( count( $examples ) ), 'apihelp-block-head', 'div'
 573                                         );
 574                                 }
 575
 576                                 $help['examples'] .= Html::openElement( 'dl' );
 577                                 foreach ( $examples as $qs => $msg ) {
 578                                         $msg = ApiBase::makeMessage( $msg, $context, array(
 579                                                 $module->getModulePrefix(),
 580                                                 $module->getModuleName(),
 581                                                 $module->getModulePath()
 582                                         ) );
 583
 584                                         $link = wfAppendQuery( wfScript( 'api' ), $qs );
 585                                         $help['examples'] .= Html::rawElement( 'dt', null, $msg->parse() );
 586                                         $help['examples'] .= Html::rawElement( 'dd', null,
 587                                                 Html::element( 'a', array( 'href' => $link ), "api.php?$qs" )
 588                                         );
 589                                 }
 590                                 $help['examples'] .= Html::closeElement( 'dl' );
 591                                 $help['examples'] .= Html::closeElement( 'div' );
 592                         }
 593
 594                         if ( $options['submodules'] && $module->getModuleManager() ) {
 595                                 $manager = $module->getModuleManager();
 596                                 $submodules = array();
 597                                 foreach ( $groups as $group ) {
 598                                         $names = $manager->getNames( $group );
 599                                         sort( $names );
 600                                         foreach ( $names as $name ) {
 601                                                 $submodules[] = $manager->getModule( $name );
 602                                         }
 603                                 }
 604                                 $help['submodules'] .= self::getHelpInternal( $context, $submodules, array(
 605                                         'submodules' => $options['recursivesubmodules'],
 606                                         'headerlevel' => $level + 1,
 607                                         'noheader' => false,
 608                                 ) + $options, $haveModules );
 609                         }
 610
 611                         $module->modifyHelp( $help, $options );
 612
 613                         wfRunHooks( 'APIHelpModifyOutput', array( $module, &$help, $options ) );
 614
 615                         $out .= join( "\n", $help );
 616                 }
 617
 618                 return $out;
 619         }
 620
 621         public function shouldCheckMaxlag() {
 622                 return false;
 623         }
 624
 625         public function isReadMode() {
 626                 return false;
 627         }
 628
 629         public function getCustomPrinter() {
 630                 $params = $this->extractRequestParams();
 631                 if ( $params['wrap'] ) {
 632                         return null;
 633                 }
 634
 635                 $main = $this->getMain();
 636                 $errorPrinter = $main->createPrinterByName( $main->getParameter( 'format' ) );
 637                 return new ApiFormatRaw( $main, $errorPrinter );
 638         }
 639
 640         public function getAllowedParams() {
 641                 return array(
 642                         'modules' => array(
 643                                 ApiBase::PARAM_DFLT => 'main',
 644                                 ApiBase::PARAM_ISMULTI => true,
 645                         ),
 646                         'submodules' => false,
 647                         'recursivesubmodules' => false,
 648                         'wrap' => false,
 649                         'toc' => false,
 650                 );
 651         }
 652
 653         public function getExamplesMessages() {
 654                 return array(
 655                         'action=help'
 656                                 => 'apihelp-help-example-main',
 657                         'action=help&recursivesubmodules=1'
 658                                 => 'apihelp-help-example-recursive',
 659                         'action=help&modules=help'
 660                                 => 'apihelp-help-example-help',
 661                         'action=help&modules=query+info|query+categorymembers'
 662                                 => 'apihelp-help-example-query',
 663                 );
 664         }
 665
 666         public function getHelpUrls() {
 667                 return array(
 668                         'https://www.mediawiki.org/wiki/API:Main_page',
 669                         'https://www.mediawiki.org/wiki/API:FAQ',
 670                         'https://www.mediawiki.org/wiki/API:Quick_start_guide',
 671                 );
 672         }
 673 }