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                 $params = $this->extractRequestParams();
  36                 $modules = array();
  37
  38                 foreach ( $params['modules'] as $path ) {
  39                         $modules[] = $this->getModuleFromPath( $path );
  40                 }
  41
  42                 // Get the help
  43                 $context = new DerivativeContext( $this->getMain()->getContext() );
  44                 $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
  45                 $context->setLanguage( $this->getMain()->getLanguage() );
  46                 $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
  47                 $out = new OutputPage( $context );
  48                 $context->setOutput( $out );
  49
  50                 self::getHelp( $context, $modules, $params );
  51
  52                 // Grab the output from the skin
  53                 ob_start();
  54                 $context->getOutput()->output();
  55                 $html = ob_get_clean();
  56
  57                 $result = $this->getResult();
  58                 if ( $params['wrap'] ) {
  59                         $data = array(
  60                                 'mime' => 'text/html',
  61                                 'help' => $html,
  62                         );
  63                         ApiResult::setSubelementsList( $data, 'help' );
  64                         $result->addValue( null, $this->getModuleName(), $data );
  65                 } else {
  66                         $result->reset();
  67                         $result->addValue( null, 'text', $html, ApiResult::NO_SIZE_CHECK );
  68                         $result->addValue( null, 'mime', 'text/html', ApiResult::NO_SIZE_CHECK );
  69                 }
  70         }
  71
  72         /**
  73          * Generate help for the specified modules
  74          *
  75          * Help is placed into the OutputPage object returned by
  76          * $context->getOutput().
  77          *
  78          * Recognized options include:
  79          *  - headerlevel: (int) Header tag level
  80          *  - nolead: (bool) Skip the inclusion of api-help-lead
  81          *  - noheader: (bool) Skip the inclusion of the top-level section headers
  82          *  - submodules: (bool) Include help for submodules of the current module
  83          *  - recursivesubmodules: (bool) Include help for submodules recursively
  84          *  - helptitle: (string) Title to link for additional modules' help. Should contain $1.
  85          *
  86          * @param IContextSource $context
  87          * @param ApiBase[]|ApiBase $modules
  88          * @param array $options Formatting options (described above)
  89          * @return string
  90          */
  91         public static function getHelp( IContextSource $context, $modules, array $options ) {
  92                 global $wgMemc, $wgContLang;
  93
  94                 if ( !is_array( $modules ) ) {
  95                         $modules = array( $modules );
  96                 }
  97
  98                 $out = $context->getOutput();
  99                 $out->addModules( 'mediawiki.apihelp' );
 100                 $out->setPageTitle( $context->msg( 'api-help-title' ) );
 101
 102                 $cacheKey = null;
 103                 if ( count( $modules ) == 1 && $modules[0] instanceof ApiMain &&
 104                         $options['recursivesubmodules'] && $context->getLanguage() === $wgContLang
 105                 ) {
 106                         $cacheHelpTimeout = $context->getConfig()->get( 'APICacheHelpTimeout' );
 107                         if ( $cacheHelpTimeout > 0 ) {
 108                                 // Get help text from cache if present
 109                                 $cacheKey = wfMemcKey( 'apihelp', $modules[0]->getModulePath(),
 110                                         str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
 111                                 $cached = $wgMemc->get( $cacheKey );
 112                                 if ( $cached ) {
 113                                         $out->addHTML( $cached );
 114                                         return;
 115                                 }
 116                         }
 117                 }
 118                 if ( $out->getHTML() !== '' ) {
 119                         // Don't save to cache, there's someone else's content in the page
 120                         // already
 121                         $cacheKey = null;
 122                 }
 123
 124                 $options['recursivesubmodules'] = !empty( $options['recursivesubmodules'] );
 125                 $options['submodules'] = $options['recursivesubmodules'] || !empty( $options['submodules'] );
 126
 127                 // Prepend lead
 128                 if ( empty( $options['nolead'] ) ) {
 129                         $msg = $context->msg( 'api-help-lead' );
 130                         if ( !$msg->isDisabled() ) {
 131                                 $out->addHTML( $msg->parseAsBlock() );
 132                         }
 133                 }
 134
 135                 $haveModules = array();
 136                 $out->addHTML( self::getHelpInternal( $context, $modules, $options, $haveModules ) );
 137
 138                 $helptitle = isset( $options['helptitle'] ) ? $options['helptitle'] : null;
 139                 $html = self::fixHelpLinks( $out->getHTML(), $helptitle, $haveModules );
 140                 $out->clearHTML();
 141                 $out->addHTML( $html );
 142
 143                 if ( $cacheKey !== null ) {
 144                         $wgMemc->set( $cacheKey, $out->getHTML(), $cacheHelpTimeout );
 145                 }
 146         }
 147
 148         /**
 149          * Replace Special:ApiHelp links with links to api.php
 150          *
 151          * @param string $html
 152          * @param string|null $helptitle Title to link to rather than api.php, must contain '$1'
 153          * @param array $localModules Modules to link within the current page
 154          * @return string
 155          */
 156         public static function fixHelpLinks( $html, $helptitle = null, $localModules = array() ) {
 157                 $formatter = new HtmlFormatter( $html );
 158                 $doc = $formatter->getDoc();
 159                 $xpath = new DOMXPath( $doc );
 160                 $nodes = $xpath->query( '//a[@href][not(contains(@class,\'apihelp-linktrail\'))]' );
 161                 foreach ( $nodes as $node ) {
 162                         $href = $node->getAttribute( 'href' );
 163                         do {
 164                                 $old = $href;
 165                                 $href = rawurldecode( $href );
 166                         } while ( $old !== $href );
 167                         if ( preg_match( '!Special:ApiHelp/([^&/|#]+)((?:#.*)?)!', $href, $m ) ) {
 168                                 if ( isset( $localModules[$m[1]] ) ) {
 169                                         $href = $m[2] === '' ? '#' . $m[1] : $m[2];
 170                                 } elseif ( $helptitle !== null ) {
 171                                         $href = Title::newFromText( str_replace( '$1', $m[1], $helptitle ) . $m[2] )
 172                                                 ->getFullUrl();
 173                                 } else {
 174                                         $href = wfAppendQuery( wfScript( 'api' ), array(
 175                                                 'action' => 'help',
 176                                                 'modules' => $m[1],
 177                                         ) ) . $m[2];
 178                                 }
 179                                 $node->setAttribute( 'href', $href );
 180                                 $node->removeAttribute( 'title' );
 181                         }
 182                 }
 183
 184                 return $formatter->getText();
 185         }
 186
 187         /**
 188          * Wrap a message in HTML with a class.
 189          *
 190          * @param Message $msg
 191          * @param string $class
 192          * @param string $tag
 193          * @return string
 194          */
 195         private static function wrap( Message $msg, $class, $tag = 'span' ) {
 196                 return Html::rawElement( $tag, array( 'class' => $class ),
 197                         $msg->parse()
 198                 );
 199         }
 200
 201         /**
 202          * Recursively-called function to actually construct the help
 203          *
 204          * @param IContextSource $context
 205          * @param ApiBase[] $modules
 206          * @param array $options
 207          * @param array &$haveModules
 208          * @return string
 209          */
 210         private static function getHelpInternal( IContextSource $context, array $modules,
 211                 array $options, &$haveModules
 212         ) {
 213                 $out = '';
 214
 215                 $level = min( 6, empty( $options['headerlevel'] ) ? 2 : $options['headerlevel'] );
 216                 $options['headerlevel'] = $level;
 217
 218                 foreach ( $modules as $module ) {
 219                         $haveModules[$module->getModulePath()] = true;
 220                         $module->setContext( $context );
 221                         $help = array(
 222                                 'header' => '',
 223                                 'flags' => '',
 224                                 'description' => '',
 225                                 'help-urls' => '',
 226                                 'parameters' => '',
 227                                 'examples' => '',
 228                                 'submodules' => '',
 229                         );
 230
 231                         if ( empty( $options['noheader'] ) ) {
 232                                 $path = $module->getModulePath();
 233                                 if ( $module->isMain() ) {
 234                                         $header = $context->msg( 'api-help-main-header' )->parse();
 235                                 } else {
 236                                         $name = $module->getModuleName();
 237                                         $header = $module->getParent()->getModuleManager()->getModuleGroup( $name ) .
 238                                                 "=$name";
 239                                         if ( $module->getModulePrefix() !== '' ) {
 240                                                 $header .= ' ' .
 241                                                         $context->msg( 'parentheses', $module->getModulePrefix() )->parse();
 242                                         }
 243                                 }
 244                                 $help['header'] .= Html::element( "h$level",
 245                                         array( 'id' => $path, 'class' => 'apihelp-header' ),
 246                                         $header
 247                                 );
 248                         }
 249
 250                         $links = array();
 251                         $any = false;
 252                         for ( $m = $module; $m !== null; $m = $m->getParent() ) {
 253                                 $name = $m->getModuleName();
 254                                 if ( $name === 'main_int' ) {
 255                                         $name = 'main';
 256                                 }
 257
 258                                 if ( count( $modules ) === 1 && $m === $modules[0] &&
 259                                         !( !empty( $options['submodules'] ) && $m->getModuleManager() )
 260                                 ) {
 261                                         $link = Html::element( 'b', null, $name );
 262                                 } else {
 263                                         $link = SpecialPage::getTitleFor( 'ApiHelp', $m->getModulePath() )->getLocalURL();
 264                                         $link = Html::element( 'a',
 265                                                 array( 'href' => $link, 'class' => 'apihelp-linktrail' ),
 266                                                 $name
 267                                         );
 268                                         $any = true;
 269                                 }
 270                                 array_unshift( $links, $link );
 271                         }
 272                         if ( $any ) {
 273                                 $help['header'] .= self::wrap(
 274                                         $context->msg( 'parentheses' )
 275                                                 ->rawParams( $context->getLanguage()->pipeList( $links ) ),
 276                                         'apihelp-linktrail', 'div'
 277                                 );
 278                         }
 279
 280                         $help['flags'] .= Html::openElement( 'div',
 281                                 array( 'class' => 'apihelp-block apihelp-flags' ) );
 282                         $msg = $context->msg( 'api-help-flags' );
 283                         if ( !$msg->isDisabled() ) {
 284                                 $help['flags'] .= self::wrap(
 285                                         $msg->numParams( count( $flags ) ), 'apihelp-block-head', 'div'
 286                                 );
 287                         }
 288                         $help['flags'] .= Html::openElement( 'ul' );
 289                         foreach ( $module->getHelpFlags() as $flag ) {
 290                                 $help['flags'] .= Html::rawElement( 'li', null,
 291                                         self::wrap( $context->msg( "api-help-flag-$flag" ), "apihelp-flag-$flag" )
 292                                 );
 293                         }
 294                         $sourceInfo = $module->getModuleSourceInfo();
 295                         if ( $sourceInfo ) {
 296                                 if ( isset( $sourceInfo['namemsg'] ) ) {
 297                                         $extname = $context->msg( $sourceInfo['namemsg'] )->text();
 298                                 } else {
 299                                         $extname = $sourceInfo['name'];
 300                                 }
 301                                 $help['flags'] .= Html::rawElement( 'li', null,
 302                                         self::wrap(
 303                                                 $context->msg( 'api-help-source', $extname, $sourceInfo['name'] ),
 304                                                 'apihelp-source'
 305                                         )
 306                                 );
 307
 308                                 $link = SpecialPage::getTitleFor( 'Version', 'License/' . $sourceInfo['name'] );
 309                                 if ( isset( $sourceInfo['license-name'] ) ) {
 310                                         $msg = $context->msg( 'api-help-license', $link, $sourceInfo['license-name'] );
 311                                 } elseif ( SpecialVersion::getExtLicenseFileName( dirname( $sourceInfo['path'] ) ) ) {
 312                                         $msg = $context->msg( 'api-help-license-noname', $link );
 313                                 } else {
 314                                         $msg = $context->msg( 'api-help-license-unknown' );
 315                                 }
 316                                 $help['flags'] .= Html::rawElement( 'li', null,
 317                                         self::wrap( $msg, 'apihelp-license' )
 318                                 );
 319                         } else {
 320                                 $help['flags'] .= Html::rawElement( 'li', null,
 321                                         self::wrap( $context->msg( 'api-help-source-unknown' ), 'apihelp-source' )
 322                                 );
 323                                 $help['flags'] .= Html::rawElement( 'li', null,
 324                                         self::wrap( $context->msg( 'api-help-license-unknown' ), 'apihelp-license' )
 325                                 );
 326                         }
 327                         $help['flags'] .= Html::closeElement( 'ul' );
 328                         $help['flags'] .= Html::closeElement( 'div' );
 329
 330                         foreach ( $module->getFinalDescription() as $msg ) {
 331                                 $msg->setContext( $context );
 332                                 $help['description'] .= $msg->parseAsBlock();
 333                         }
 334
 335                         $urls = $module->getHelpUrls();
 336                         if ( $urls ) {
 337                                 $help['help-urls'] .= Html::openElement( 'div',
 338                                         array( 'class' => 'apihelp-block apihelp-help-urls' )
 339                                 );
 340                                 $msg = $context->msg( 'api-help-help-urls' );
 341                                 if ( !$msg->isDisabled() ) {
 342                                         $help['help-urls'] .= self::wrap(
 343                                                 $msg->numParams( count( $urls ) ), 'apihelp-block-head', 'div'
 344                                         );
 345                                 }
 346                                 if ( !is_array( $urls ) ) {
 347                                         $urls = array( $urls );
 348                                 }
 349                                 $help['help-urls'] .= Html::openElement( 'ul' );
 350                                 foreach ( $urls as $url ) {
 351                                         $help['help-urls'] .= Html::rawElement( 'li', null,
 352                                                 Html::element( 'a', array( 'href' => $url ), $url )
 353                                         );
 354                                 }
 355                                 $help['help-urls'] .= Html::closeElement( 'ul' );
 356                                 $help['help-urls'] .= Html::closeElement( 'div' );
 357                         }
 358
 359                         $params = $module->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
 360                         $groups = array();
 361                         if ( $params ) {
 362                                 $help['parameters'] .= Html::openElement( 'div',
 363                                         array( 'class' => 'apihelp-block apihelp-parameters' )
 364                                 );
 365                                 $msg = $context->msg( 'api-help-parameters' );
 366                                 if ( !$msg->isDisabled() ) {
 367                                         $help['parameters'] .= self::wrap(
 368                                                 $msg->numParams( count( $params ) ), 'apihelp-block-head', 'div'
 369                                         );
 370                                 }
 371                                 $help['parameters'] .= Html::openElement( 'dl' );
 372
 373                                 $descriptions = $module->getFinalParamDescription();
 374
 375                                 foreach ( $params as $name => $settings ) {
 376                                         if ( !is_array( $settings ) ) {
 377                                                 $settings = array( ApiBase::PARAM_DFLT => $settings );
 378                                         }
 379
 380                                         $help['parameters'] .= Html::element( 'dt', null,
 381                                                 $module->encodeParamName( $name ) );
 382
 383                                         // Add description
 384                                         $description = array();
 385                                         if ( isset( $descriptions[$name] ) ) {
 386                                                 foreach ( $descriptions[$name] as $msg ) {
 387                                                         $msg->setContext( $context );
 388                                                         $description[] = $msg->parseAsBlock();
 389                                                 }
 390                                         }
 391
 392                                         // Add usage info
 393                                         $info = array();
 394
 395                                         // Required?
 396                                         if ( !empty( $settings[ApiBase::PARAM_REQUIRED] ) ) {
 397                                                 $info[] = $context->msg( 'api-help-param-required' )->parse();
 398                                         }
 399
 400                                         // Custom info?
 401                                         if ( !empty( $settings[ApiBase::PARAM_HELP_MSG_INFO] ) ) {
 402                                                 foreach ( $settings[ApiBase::PARAM_HELP_MSG_INFO] as $i ) {
 403                                                         $tag = array_shift( $i );
 404                                                         $info[] = $context->msg( "apihelp-{$path}-paraminfo-{$tag}" )
 405                                                                 ->numParams( count( $i ) )
 406                                                                 ->params( $context->getLanguage()->commaList( $i ) )
 407                                                                 ->params( $module->getModulePrefix() )
 408                                                                 ->parse();
 409                                                 }
 410                                         }
 411
 412                                         // Type documentation
 413                                         if ( !isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 414                                                 $dflt = isset( $settings[ApiBase::PARAM_DFLT] )
 415                                                         ? $settings[ApiBase::PARAM_DFLT]
 416                                                         : null;
 417                                                 if ( is_bool( $dflt ) ) {
 418                                                         $settings[ApiBase::PARAM_TYPE] = 'boolean';
 419                                                 } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
 420                                                         $settings[ApiBase::PARAM_TYPE] = 'string';
 421                                                 } elseif ( is_int( $dflt ) ) {
 422                                                         $settings[ApiBase::PARAM_TYPE] = 'integer';
 423                                                 }
 424                                         }
 425                                         if ( isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 426                                                 $type = $settings[ApiBase::PARAM_TYPE];
 427                                                 $multi = !empty( $settings[ApiBase::PARAM_ISMULTI] );
 428                                                 $hintPipeSeparated = true;
 429                                                 $count = ApiBase::LIMIT_SML2 + 1;
 430
 431                                                 if ( is_array( $type ) ) {
 432                                                         $count = count( $type );
 433                                                         $links = isset( $settings[ApiBase::PARAM_VALUE_LINKS] )
 434                                                                 ? $settings[ApiBase::PARAM_VALUE_LINKS]
 435                                                                 : array();
 436                                                         $type = array_map( function ( $v ) use ( $links ) {
 437                                                                 $ret = wfEscapeWikiText( $v );
 438                                                                 if ( isset( $links[$v] ) ) {
 439                                                                         $ret = "[[{$links[$v]}|$ret]]";
 440                                                                 }
 441                                                                 return $ret;
 442                                                         }, $type );
 443                                                         $i = array_search( '', $type, true );
 444                                                         if ( $i === false ) {
 445                                                                 $type = $context->getLanguage()->commaList( $type );
 446                                                         } else {
 447                                                                 unset( $type[$i] );
 448                                                                 $type = $context->msg( 'api-help-param-list-can-be-empty' )
 449                                                                         ->numParams( count( $type ) )
 450                                                                         ->params( $context->getLanguage()->commaList( $type ) )
 451                                                                         ->parse();
 452                                                         }
 453                                                         $info[] = $context->msg( 'api-help-param-list' )
 454                                                                 ->params( $multi ? 2 : 1 )
 455                                                                 ->params( $type )
 456                                                                 ->parse();
 457                                                         $hintPipeSeparated = false;
 458                                                 } else {
 459                                                         switch ( $type ) {
 460                                                                 case 'submodule':
 461                                                                         $groups[] = $name;
 462                                                                         $submodules = $module->getModuleManager()->getNames( $name );
 463                                                                         $count = count( $submodules );
 464                                                                         sort( $submodules );
 465                                                                         $prefix = $module->isMain()
 466                                                                                 ? '' : ( $module->getModulePath() . '+' );
 467                                                                         $submodules = array_map( function ( $name ) use ( $prefix ) {
 468                                                                                 return "[[Special:ApiHelp/{$prefix}{$name}|{$name}]]";
 469                                                                         }, $submodules );
 470                                                                         $info[] = $context->msg( 'api-help-param-list' )
 471                                                                                 ->params( $multi ? 2 : 1 )
 472                                                                                 ->params( $context->getLanguage()->commaList( $submodules ) )
 473                                                                                 ->parse();
 474                                                                         $hintPipeSeparated = false;
 475                                                                         // No type message necessary, we have a list of values.
 476                                                                         $type = null;
 477                                                                         break;
 478
 479                                                                 case 'namespace':
 480                                                                         $namespaces = MWNamespace::getValidNamespaces();
 481                                                                         $count = count( $namespaces );
 482                                                                         $info[] = $context->msg( 'api-help-param-list' )
 483                                                                                 ->params( $multi ? 2 : 1 )
 484                                                                                 ->params( $context->getLanguage()->commaList( $namespaces ) )
 485                                                                                 ->parse();
 486                                                                         $hintPipeSeparated = false;
 487                                                                         // No type message necessary, we have a list of values.
 488                                                                         $type = null;
 489                                                                         break;
 490
 491                                                                 case 'limit':
 492                                                                         if ( isset( $settings[ApiBase::PARAM_MAX2] ) ) {
 493                                                                                 $info[] = $context->msg( 'api-help-param-limit2' )
 494                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 495                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX2] )
 496                                                                                         ->parse();
 497                                                                         } else {
 498                                                                                 $info[] = $context->msg( 'api-help-param-limit' )
 499                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 500                                                                                         ->parse();
 501                                                                         }
 502                                                                         break;
 503
 504                                                                 case 'integer':
 505                                                                         // Possible messages:
 506                                                                         // api-help-param-integer-min,
 507                                                                         // api-help-param-integer-max,
 508                                                                         // api-help-param-integer-minmax
 509                                                                         $suffix = '';
 510                                                                         $min = $max = 0;
 511                                                                         if ( isset( $settings[ApiBase::PARAM_MIN] ) ) {
 512                                                                                 $suffix .= 'min';
 513                                                                                 $min = $settings[ApiBase::PARAM_MIN];
 514                                                                         }
 515                                                                         if ( isset( $settings[ApiBase::PARAM_MAX] ) ) {
 516                                                                                 $suffix .= 'max';
 517                                                                                 $max = $settings[ApiBase::PARAM_MAX];
 518                                                                         }
 519                                                                         if ( $suffix !== '' ) {
 520                                                                                 $info[] =
 521                                                                                         $context->msg( "api-help-param-integer-$suffix" )
 522                                                                                                 ->params( $multi ? 2 : 1 )
 523                                                                                                 ->numParams( $min, $max )
 524                                                                                                 ->parse();
 525                                                                         }
 526                                                                         break;
 527
 528                                                                 case 'upload':
 529                                                                         $info[] = $context->msg( 'api-help-param-upload' )
 530                                                                                 ->parse();
 531                                                                         // No type message necessary, api-help-param-upload should handle it.
 532                                                                         $type = null;
 533                                                                         break;
 534
 535                                                                 case 'string':
 536                                                                         // Displaying a type message here would be useless.
 537                                                                         $type = null;
 538                                                                         break;
 539                                                         }
 540                                                 }
 541
 542                                                 // Add type. Messages for grep: api-help-param-type-limit
 543                                                 // api-help-param-type-integer api-help-param-type-boolean
 544                                                 // api-help-param-type-timestamp api-help-param-type-user
 545                                                 if ( is_string( $type ) ) {
 546                                                         $msg = $context->msg( "api-help-param-type-$type" );
 547                                                         if ( !$msg->isDisabled() ) {
 548                                                                 $info[] = $msg->params( $multi ? 2 : 1 )->parse();
 549                                                         }
 550                                                 }
 551
 552                                                 if ( $multi ) {
 553                                                         $extra = array();
 554                                                         if ( $hintPipeSeparated ) {
 555                                                                 $extra[] = $context->msg( 'api-help-param-multi-separate' )->parse();
 556                                                         }
 557                                                         if ( $count > ApiBase::LIMIT_SML1 ) {
 558                                                                 $extra[] = $context->msg( 'api-help-param-multi-max' )
 559                                                                         ->numParams( ApiBase::LIMIT_SML1, ApiBase::LIMIT_SML2 )
 560                                                                         ->parse();
 561                                                         }
 562                                                         if ( $extra ) {
 563                                                                 $info[] = join( ' ', $extra );
 564                                                         }
 565                                                 }
 566                                         }
 567
 568                                         // Add default
 569                                         $default = isset( $settings[ApiBase::PARAM_DFLT] )
 570                                                 ? $settings[ApiBase::PARAM_DFLT]
 571                                                 : null;
 572                                         if ( $default === '' ) {
 573                                                 $info[] = $context->msg( 'api-help-param-default-empty' )
 574                                                         ->parse();
 575                                         } elseif ( $default !== null && $default !== false ) {
 576                                                 $info[] = $context->msg( 'api-help-param-default' )
 577                                                         ->params( wfEscapeWikiText( $default ) )
 578                                                         ->parse();
 579                                         }
 580
 581                                         if ( !array_filter( $description ) ) {
 582                                                 $description = array( self::wrap(
 583                                                         $context->msg( 'api-help-param-no-description' ),
 584                                                         'apihelp-empty'
 585                                                 ) );
 586                                         }
 587
 588                                         // Add "deprecated" flag
 589                                         if ( !empty( $settings[ApiBase::PARAM_DEPRECATED] ) ) {
 590                                                 $help['parameters'] .= Html::openElement( 'dd',
 591                                                         array( 'class' => 'info' ) );
 592                                                 $help['parameters'] .= self::wrap(
 593                                                         $context->msg( 'api-help-param-deprecated' ),
 594                                                         'apihelp-deprecated', 'strong'
 595                                                 );
 596                                                 $help['parameters'] .= Html::closeElement( 'dd' );
 597                                         }
 598
 599                                         if ( $description ) {
 600                                                 $description = join( '', $description );
 601                                                 $description = preg_replace( '!\s*</([oud]l)>\s*<\1>\s*!', "\n", $description );
 602                                                 $help['parameters'] .= Html::rawElement( 'dd',
 603                                                         array( 'class' => 'description' ), $description );
 604                                         }
 605
 606                                         foreach ( $info as $i ) {
 607                                                 $help['parameters'] .= Html::rawElement( 'dd', array( 'class' => 'info' ), $i );
 608                                         }
 609                                 }
 610
 611                                 $help['parameters'] .= Html::closeElement( 'dl' );
 612                                 $help['parameters'] .= Html::closeElement( 'div' );
 613                         }
 614
 615                         $examples = $module->getExamplesMessages();
 616                         if ( $examples ) {
 617                                 $help['examples'] .= Html::openElement( 'div',
 618                                         array( 'class' => 'apihelp-block apihelp-examples' ) );
 619                                 $msg = $context->msg( 'api-help-examples' );
 620                                 if ( !$msg->isDisabled() ) {
 621                                         $help['examples'] .= self::wrap(
 622                                                 $msg->numParams( count( $examples ) ), 'apihelp-block-head', 'div'
 623                                         );
 624                                 }
 625
 626                                 $help['examples'] .= Html::openElement( 'dl' );
 627                                 foreach ( $examples as $qs => $msg ) {
 628                                         $msg = ApiBase::makeMessage( $msg, $context, array(
 629                                                 $module->getModulePrefix(),
 630                                                 $module->getModuleName(),
 631                                                 $module->getModulePath()
 632                                         ) );
 633
 634                                         $link = wfAppendQuery( wfScript( 'api' ), $qs );
 635                                         $help['examples'] .= Html::rawElement( 'dt', null, $msg->parse() );
 636                                         $help['examples'] .= Html::rawElement( 'dd', null,
 637                                                 Html::element( 'a', array( 'href' => $link ), "api.php?$qs" )
 638                                         );
 639                                 }
 640                                 $help['examples'] .= Html::closeElement( 'dl' );
 641                                 $help['examples'] .= Html::closeElement( 'div' );
 642                         }
 643
 644                         if ( $options['submodules'] && $module->getModuleManager() ) {
 645                                 $manager = $module->getModuleManager();
 646                                 $submodules = array();
 647                                 foreach ( $groups as $group ) {
 648                                         $names = $manager->getNames( $group );
 649                                         sort( $names );
 650                                         foreach ( $names as $name ) {
 651                                                 $submodules[] = $manager->getModule( $name );
 652                                         }
 653                                 }
 654                                 $help['submodules'] .= self::getHelpInternal( $context, $submodules, array(
 655                                         'submodules' => $options['recursivesubmodules'],
 656                                         'headerlevel' => $level + 1,
 657                                         'noheader' => false,
 658                                 ) + $options, $haveModules );
 659                         }
 660
 661                         $module->modifyHelp( $help, $options );
 662
 663                         Hooks::run( 'APIHelpModifyOutput', array( $module, &$help, $options ) );
 664
 665                         $out .= join( "\n", $help );
 666                 }
 667
 668                 return $out;
 669         }
 670
 671         public function shouldCheckMaxlag() {
 672                 return false;
 673         }
 674
 675         public function isReadMode() {
 676                 return false;
 677         }
 678
 679         public function getCustomPrinter() {
 680                 $params = $this->extractRequestParams();
 681                 if ( $params['wrap'] ) {
 682                         return null;
 683                 }
 684
 685                 $main = $this->getMain();
 686                 $errorPrinter = $main->createPrinterByName( $main->getParameter( 'format' ) );
 687                 return new ApiFormatRaw( $main, $errorPrinter );
 688         }
 689
 690         public function getAllowedParams() {
 691                 return array(
 692                         'modules' => array(
 693                                 ApiBase::PARAM_DFLT => 'main',
 694                                 ApiBase::PARAM_ISMULTI => true,
 695                         ),
 696                         'submodules' => false,
 697                         'recursivesubmodules' => false,
 698                         'wrap' => false,
 699                         'toc' => false,
 700                 );
 701         }
 702
 703         protected function getExamplesMessages() {
 704                 return array(
 705                         'action=help'
 706                                 => 'apihelp-help-example-main',
 707                         'action=help&recursivesubmodules=1'
 708                                 => 'apihelp-help-example-recursive',
 709                         'action=help&modules=help'
 710                                 => 'apihelp-help-example-help',
 711                         'action=help&modules=query+info|query+categorymembers'
 712                                 => 'apihelp-help-example-query',
 713                 );
 714         }
 715
 716         public function getHelpUrls() {
 717                 return array(
 718                         'https://www.mediawiki.org/wiki/API:Main_page',
 719                         'https://www.mediawiki.org/wiki/API:FAQ',
 720                         'https://www.mediawiki.org/wiki/API:Quick_start_guide',
 721                 );
 722         }
 723 }