includes/resourceloader/ResourceLoader.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  * @author Roan Kattouw
  20  * @author Trevor Parscal
  21  */
  22
  23 /**
  24  * Dynamic JavaScript and CSS resource loading system.
  25  *
  26  * Most of the documention is on the MediaWiki documentation wiki starting at:
  27  *    http://www.mediawiki.org/wiki/ResourceLoader
  28  */
  29 class ResourceLoader {
  30
  31         /* Protected Static Members */
  32
  33         /** Array: List of module name/ResourceLoaderModule object pairs */
  34         protected $modules = array();
  35         /** Associative array mapping module name to info associative array */
  36         protected $moduleInfos = array();
  37
  38         /* Protected Methods */
  39
  40         /**
  41          * Loads information stored in the database about modules.
  42          *
  43          * This method grabs modules dependencies from the database and updates modules
  44          * objects.
  45          *
  46          * This is not inside the module code because it is much faster to
  47          * request all of the information at once than it is to have each module
  48          * requests its own information. This sacrifice of modularity yields a substantial
  49          * performance improvement.
  50          *
  51          * @param $modules Array: List of module names to preload information for
  52          * @param $context ResourceLoaderContext: Context to load the information within
  53          */
  54         public function preloadModuleInfo( array $modules, ResourceLoaderContext $context ) {
  55                 if ( !count( $modules ) ) {
  56                         return; // or else Database*::select() will explode, plus it's cheaper!
  57                 }
  58                 $dbr = wfGetDB( DB_SLAVE );
  59                 $skin = $context->getSkin();
  60                 $lang = $context->getLanguage();
  61
  62                 // Get file dependency information
  63                 $res = $dbr->select( 'module_deps', array( 'md_module', 'md_deps' ), array(
  64                                 'md_module' => $modules,
  65                                 'md_skin' => $context->getSkin()
  66                         ), __METHOD__
  67                 );
  68
  69                 // Set modules' dependencies
  70                 $modulesWithDeps = array();
  71                 foreach ( $res as $row ) {
  72                         $this->getModule( $row->md_module )->setFileDependencies( $skin,
  73                                 FormatJson::decode( $row->md_deps, true )
  74                         );
  75                         $modulesWithDeps[] = $row->md_module;
  76                 }
  77
  78                 // Register the absence of a dependency row too
  79                 foreach ( array_diff( $modules, $modulesWithDeps ) as $name ) {
  80                         $this->getModule( $name )->setFileDependencies( $skin, array() );
  81                 }
  82
  83                 // Get message blob mtimes. Only do this for modules with messages
  84                 $modulesWithMessages = array();
  85                 foreach ( $modules as $name ) {
  86                         if ( count( $this->getModule( $name )->getMessages() ) ) {
  87                                 $modulesWithMessages[] = $name;
  88                         }
  89                 }
  90                 $modulesWithoutMessages = array_flip( $modules ); // Will be trimmed down by the loop below
  91                 if ( count( $modulesWithMessages ) ) {
  92                         $res = $dbr->select( 'msg_resource', array( 'mr_resource', 'mr_timestamp' ), array(
  93                                         'mr_resource' => $modulesWithMessages,
  94                                         'mr_lang' => $lang
  95                                 ), __METHOD__
  96                         );
  97                         foreach ( $res as $row ) {
  98                                 $this->getModule( $row->mr_resource )->setMsgBlobMtime( $lang,
  99                                         wfTimestamp( TS_UNIX, $row->mr_timestamp ) );
 100                                 unset( $modulesWithoutMessages[$row->mr_resource] );
 101                         }
 102                 }
 103                 foreach ( array_keys( $modulesWithoutMessages ) as $name ) {
 104                         $this->getModule( $name )->setMsgBlobMtime( $lang, 0 );
 105                 }
 106         }
 107
 108         /**
 109          * Runs JavaScript or CSS data through a filter, caching the filtered result for future calls.
 110          *
 111          * Available filters are:
 112          *  - minify-js \see JavaScriptDistiller::stripWhiteSpace
 113          *  - minify-css \see CSSMin::minify
 114          *
 115          * If $data is empty, only contains whitespace or the filter was unknown,
 116          * $data is returned unmodified.
 117          *
 118          * @param $filter String: Name of filter to run
 119          * @param $data String: Text to filter, such as JavaScript or CSS text
 120          * @return String: Filtered data, or a comment containing an error message
 121          */
 122         protected function filter( $filter, $data ) {
 123                 global $wgResourceLoaderMinifyJSVerticalSpace;
 124
 125                 wfProfileIn( __METHOD__ );
 126
 127                 // For empty/whitespace-only data or for unknown filters, don't perform
 128                 // any caching or processing
 129                 if ( trim( $data ) === ''
 130                         || !in_array( $filter, array( 'minify-js', 'minify-css' ) ) )
 131                 {
 132                         wfProfileOut( __METHOD__ );
 133                         return $data;
 134                 }
 135
 136                 // Try for cache hit
 137                 // Use CACHE_ANYTHING since filtering is very slow compared to DB queries
 138                 $key = wfMemcKey( 'resourceloader', 'filter', $filter, md5( $data ) );
 139                 $cache = wfGetCache( CACHE_ANYTHING );
 140                 $cacheEntry = $cache->get( $key );
 141                 if ( is_string( $cacheEntry ) ) {
 142                         wfProfileOut( __METHOD__ );
 143                         return $cacheEntry;
 144                 }
 145
 146                 // Run the filter - we've already verified one of these will work
 147                 try {
 148                         switch ( $filter ) {
 149                                 case 'minify-js':
 150                                         $result = JavaScriptDistiller::stripWhiteSpace(
 151                                                 $data, $wgResourceLoaderMinifyJSVerticalSpace
 152                                         );
 153                                         break;
 154                                 case 'minify-css':
 155                                         $result = CSSMin::minify( $data );
 156                                         break;
 157                         }
 158
 159                         // Save filtered text to Memcached
 160                         $cache->set( $key, $result );
 161                 } catch ( Exception $exception ) {
 162                         // Return exception as a comment
 163                         $result = "/*\n{$exception->__toString()}\n*/\n";
 164                 }
 165
 166                 wfProfileOut( __METHOD__ );
 167
 168                 return $result;
 169         }
 170
 171         /* Methods */
 172
 173         /**
 174          * Registers core modules and runs registration hooks.
 175          */
 176         public function __construct() {
 177                 global $IP, $wgResourceModules;
 178
 179                 wfProfileIn( __METHOD__ );
 180
 181                 // Register core modules
 182                 $this->register( include( "$IP/resources/Resources.php" ) );
 183                 // Register extension modules
 184                 wfRunHooks( 'ResourceLoaderRegisterModules', array( &$this ) );
 185                 $this->register( $wgResourceModules );
 186
 187                 wfProfileOut( __METHOD__ );
 188         }
 189
 190         /**
 191          * Registers a module with the ResourceLoader system.
 192          *
 193          * @param $name Mixed: Name of module as a string or List of name/object pairs as an array
 194          * @param $info Module info array. For backwards compatibility with 1.17alpha,
 195          *   this may also be a ResourceLoaderModule object. Optional when using
 196          *   multiple-registration calling style.
 197          * @throws MWException: If a duplicate module registration is attempted
 198          * @throws MWException: If something other than a ResourceLoaderModule is being registered
 199          * @return Boolean: False if there were any errors, in which case one or more modules were not
 200          *     registered
 201          */
 202         public function register( $name, $info = null ) {
 203                 wfProfileIn( __METHOD__ );
 204
 205                 // Allow multiple modules to be registered in one call
 206                 if ( is_array( $name ) ) {
 207                         foreach ( $name as $key => $value ) {
 208                                 $this->register( $key, $value );
 209                         }
 210                         wfProfileOut( __METHOD__ );
 211                         return;
 212                 }
 213
 214                 // Disallow duplicate registrations
 215                 if ( isset( $this->moduleInfos[$name] ) ) {
 216                         // A module has already been registered by this name
 217                         throw new MWException(
 218                                 'ResourceLoader duplicate registration error. ' .
 219                                 'Another module has already been registered as ' . $name
 220                         );
 221                 }
 222
 223                 // Attach module
 224                 if ( is_object( $info ) ) {
 225                         // Old calling convention
 226                         // Validate the input
 227                         if ( !( $info instanceof ResourceLoaderModule ) ) {
 228                                 throw new MWException( 'ResourceLoader invalid module error. ' .
 229                                         'Instances of ResourceLoaderModule expected.' );
 230                         }
 231
 232                         $this->moduleInfos[$name] = array( 'object' => $info );
 233                         $info->setName( $name );
 234                         $this->modules[$name] = $info;
 235                 } else {
 236                         // New calling convention
 237                         $this->moduleInfos[$name] = $info;
 238                 }
 239
 240                 wfProfileOut( __METHOD__ );
 241         }
 242
 243         /**
 244          * Get a list of module names
 245          *
 246          * @return Array: List of module names
 247          */
 248         public function getModuleNames() {
 249                 return array_keys( $this->moduleInfos );
 250         }
 251
 252         /**
 253          * Get the ResourceLoaderModule object for a given module name.
 254          *
 255          * @param $name String: Module name
 256          * @return Mixed: ResourceLoaderModule if module has been registered, null otherwise
 257          */
 258         public function getModule( $name ) {
 259                 if ( !isset( $this->modules[$name] ) ) {
 260                         if ( !isset( $this->moduleInfos[$name] ) ) {
 261                                 // No such module
 262                                 return null;
 263                         }
 264                         // Construct the requested object
 265                         $info = $this->moduleInfos[$name];
 266                         if ( isset( $info['object'] ) ) {
 267                                 // Object given in info array
 268                                 $object = $info['object'];
 269                         } else {
 270                                 if ( !isset( $info['class'] ) ) {
 271                                         $class = 'ResourceLoaderFileModule';
 272                                 } else {
 273                                         $class = $info['class'];
 274                                 }
 275                                 $object = new $class( $info );
 276                         }
 277                         $object->setName( $name );
 278                         $this->modules[$name] = $object;
 279                 }
 280
 281                 return $this->modules[$name];
 282         }
 283
 284         /**
 285          * Outputs a response to a resource load-request, including a content-type header.
 286          *
 287          * @param $context ResourceLoaderContext: Context in which a response should be formed
 288          */
 289         public function respond( ResourceLoaderContext $context ) {
 290                 global $wgResourceLoaderMaxage, $wgCacheEpoch;
 291
 292                 // Buffer output to catch warnings. Normally we'd use ob_clean() on the
 293                 // top-level output buffer to clear warnings, but that breaks when ob_gzhandler
 294                 // is used: ob_clean() will clear the GZIP header in that case and it won't come
 295                 // back for subsequent output, resulting in invalid GZIP. So we have to wrap
 296                 // the whole thing in our own output buffer to be sure the active buffer
 297                 // doesn't use ob_gzhandler.
 298                 // See http://bugs.php.net/bug.php?id=36514
 299                 ob_start();
 300
 301                 wfProfileIn( __METHOD__ );
 302                 $exceptions = '';
 303
 304                 // Split requested modules into two groups, modules and missing
 305                 $modules = array();
 306                 $missing = array();
 307                 foreach ( $context->getModules() as $name ) {
 308                         if ( isset( $this->moduleInfos[$name] ) ) {
 309                                 $modules[$name] = $this->getModule( $name );
 310                         } else {
 311                                 $missing[] = $name;
 312                         }
 313                 }
 314
 315                 // If a version wasn't specified we need a shorter expiry time for updates
 316                 // to propagate to clients quickly
 317                 if ( is_null( $context->getVersion() ) ) {
 318                         $maxage  = $wgResourceLoaderMaxage['unversioned']['client'];
 319                         $smaxage = $wgResourceLoaderMaxage['unversioned']['server'];
 320                 }
 321                 // If a version was specified we can use a longer expiry time since changing
 322                 // version numbers causes cache misses
 323                 else {
 324                         $maxage  = $wgResourceLoaderMaxage['versioned']['client'];
 325                         $smaxage = $wgResourceLoaderMaxage['versioned']['server'];
 326                 }
 327
 328                 // Preload information needed to the mtime calculation below
 329                 try {
 330                         $this->preloadModuleInfo( array_keys( $modules ), $context );
 331                 } catch( Exception $e ) {
 332                         // Add exception to the output as a comment
 333                         $exceptions .= "/*\n{$e->__toString()}\n*/\n";
 334                 }
 335
 336                 wfProfileIn( __METHOD__.'-getModifiedTime' );
 337
 338                 $private = false;
 339                 // To send Last-Modified and support If-Modified-Since, we need to detect
 340                 // the last modified time
 341                 $mtime = wfTimestamp( TS_UNIX, $wgCacheEpoch );
 342                 foreach ( $modules as $module ) {
 343                         try {
 344                                 // Bypass Squid and other shared caches if the request includes any private modules
 345                                 if ( $module->getGroup() === 'private' ) {
 346                                         $private = true;
 347                                 }
 348                                 // Calculate maximum modified time
 349                                 $mtime = max( $mtime, $module->getModifiedTime( $context ) );
 350                         } catch ( Exception $e ) {
 351                                 // Add exception to the output as a comment
 352                                 $exceptions .= "/*\n{$e->__toString()}\n*/\n";
 353                         }
 354                 }
 355
 356                 wfProfileOut( __METHOD__.'-getModifiedTime' );
 357
 358                 if ( $context->getOnly() === 'styles' ) {
 359                         header( 'Content-Type: text/css' );
 360                 } else {
 361                         header( 'Content-Type: text/javascript' );
 362                 }
 363                 header( 'Last-Modified: ' . wfTimestamp( TS_RFC2822, $mtime ) );
 364                 if ( $context->getDebug() ) {
 365                         // Do not cache debug responses
 366                         header( 'Cache-Control: private, no-cache, must-revalidate' );
 367                         header( 'Pragma: no-cache' );
 368                 } else {
 369                         if ( $private ) {
 370                                 header( "Cache-Control: private, max-age=$maxage" );
 371                                 $exp = $maxage;
 372                         } else {
 373                                 header( "Cache-Control: public, max-age=$maxage, s-maxage=$smaxage" );
 374                                 $exp = min( $maxage, $smaxage );
 375                         }
 376                         header( 'Expires: ' . wfTimestamp( TS_RFC2822, $exp + time() ) );
 377                 }
 378
 379                 // If there's an If-Modified-Since header, respond with a 304 appropriately
 380                 // Some clients send "timestamp;length=123". Strip the part after the first ';'
 381                 // so we get a valid timestamp.
 382                 $ims = $context->getRequest()->getHeader( 'If-Modified-Since' );
 383                 if ( $ims !== false ) {
 384                         $imsTS = strtok( $ims, ';' );
 385                         if ( $mtime <= wfTimestamp( TS_UNIX, $imsTS ) ) {
 386                                 // There's another bug in ob_gzhandler (see also the comment at
 387                                 // the top of this function) that causes it to gzip even empty
 388                                 // responses, meaning it's impossible to produce a truly empty
 389                                 // response (because the gzip header is always there). This is
 390                                 // a problem because 304 responses have to be completely empty
 391                                 // per the HTTP spec, and Firefox behaves buggily when they're not.
 392                                 // See also http://bugs.php.net/bug.php?id=51579
 393                                 // To work around this, we tear down all output buffering before
 394                                 // sending the 304.
 395                                 // On some setups, ob_get_level() doesn't seem to go down to zero
 396                                 // no matter how often we call ob_get_clean(), so instead of doing
 397                                 // the more intuitive while ( ob_get_level() > 0 ) ob_get_clean();
 398                                 // we have to be safe here and avoid an infinite loop.
 399                                 for ( $i = 0; $i < ob_get_level(); $i++ ) {
 400                                         ob_end_clean();
 401                                 }
 402
 403                                 header( 'HTTP/1.0 304 Not Modified' );
 404                                 header( 'Status: 304 Not Modified' );
 405                                 wfProfileOut( __METHOD__ );
 406                                 return;
 407                         }
 408                 }
 409
 410                 // Generate a response
 411                 $response = $this->makeModuleResponse( $context, $modules, $missing );
 412
 413                 // Prepend comments indicating exceptions
 414                 $response = $exceptions . $response;
 415
 416                 // Capture any PHP warnings from the output buffer and append them to the
 417                 // response in a comment if we're in debug mode.
 418                 if ( $context->getDebug() && strlen( $warnings = ob_get_contents() ) ) {
 419                         $response = "/*\n$warnings\n*/\n" . $response;
 420                 }
 421
 422                 // Remove the output buffer and output the response
 423                 ob_end_clean();
 424                 echo $response;
 425
 426                 wfProfileOut( __METHOD__ );
 427         }
 428
 429         /**
 430          * Generates code for a response
 431          *
 432          * @param $context ResourceLoaderContext: Context in which to generate a response
 433          * @param $modules Array: List of module objects keyed by module name
 434          * @param $missing Array: List of unavailable modules (optional)
 435          * @return String: Response data
 436          */
 437         public function makeModuleResponse( ResourceLoaderContext $context,
 438                 array $modules, $missing = array() )
 439         {
 440                 $out = '';
 441                 $exceptions = '';
 442                 if ( $modules === array() && $missing === array() ) {
 443                         return '/* No modules requested. Max made me put this here */';
 444                 }
 445
 446                 // Pre-fetch blobs
 447                 if ( $context->shouldIncludeMessages() ) {
 448                         try {
 449                                 $blobs = MessageBlobStore::get( $this, $modules, $context->getLanguage() );
 450                         } catch ( Exception $e ) {
 451                                 // Add exception to the output as a comment
 452                                 $exceptions .= "/*\n{$e->__toString()}\n*/\n";
 453                         }
 454                 } else {
 455                         $blobs = array();
 456                 }
 457
 458                 // Generate output
 459                 foreach ( $modules as $name => $module ) {
 460                         wfProfileIn( __METHOD__ . '-' . $name );
 461                         try {
 462                                 // Scripts
 463                                 $scripts = '';
 464                                 if ( $context->shouldIncludeScripts() ) {
 465                                         $scripts .= $module->getScript( $context ) . "\n";
 466                                 }
 467
 468                                 // Styles
 469                                 $styles = array();
 470                                 if ( $context->shouldIncludeStyles() ) {
 471                                         $styles = $module->getStyles( $context );
 472                                 }
 473
 474                                 // Messages
 475                                 $messagesBlob = isset( $blobs[$name] ) ? $blobs[$name] : '{}';
 476
 477                                 // Append output
 478                                 switch ( $context->getOnly() ) {
 479                                         case 'scripts':
 480                                                 $out .= $scripts;
 481                                                 break;
 482                                         case 'styles':
 483                                                 $out .= self::makeCombinedStyles( $styles );
 484                                                 break;
 485                                         case 'messages':
 486                                                 $out .= self::makeMessageSetScript( new XmlJsCode( $messagesBlob ) );
 487                                                 break;
 488                                         default:
 489                                                 // Minify CSS before embedding in mediaWiki.loader.implement call
 490                                                 // (unless in debug mode)
 491                                                 if ( !$context->getDebug() ) {
 492                                                         foreach ( $styles as $media => $style ) {
 493                                                                 $styles[$media] = $this->filter( 'minify-css', $style );
 494                                                         }
 495                                                 }
 496                                                 $out .= self::makeLoaderImplementScript( $name, $scripts, $styles,
 497                                                         new XmlJsCode( $messagesBlob ) );
 498                                                 break;
 499                                 }
 500                         } catch ( Exception $e ) {
 501                                 // Add exception to the output as a comment
 502                                 $exceptions .= "/*\n{$e->__toString()}\n*/\n";
 503
 504                                 // Register module as missing
 505                                 $missing[] = $name;
 506                                 unset( $modules[$name] );
 507                         }
 508                         wfProfileOut( __METHOD__ . '-' . $name );
 509                 }
 510
 511                 // Update module states
 512                 if ( $context->shouldIncludeScripts() ) {
 513                         // Set the state of modules loaded as only scripts to ready
 514                         if ( count( $modules ) && $context->getOnly() === 'scripts'
 515                                 && !isset( $modules['startup'] ) )
 516                         {
 517                                 $out .= self::makeLoaderStateScript(
 518                                         array_fill_keys( array_keys( $modules ), 'ready' ) );
 519                         }
 520                         // Set the state of modules which were requested but unavailable as missing
 521                         if ( is_array( $missing ) && count( $missing ) ) {
 522                                 $out .= self::makeLoaderStateScript( array_fill_keys( $missing, 'missing' ) );
 523                         }
 524                 }
 525
 526                 if ( $context->getDebug() ) {
 527                         return $exceptions . $out;
 528                 } else {
 529                         if ( $context->getOnly() === 'styles' ) {
 530                                 return $exceptions . $this->filter( 'minify-css', $out );
 531                         } else {
 532                                 return $exceptions . $this->filter( 'minify-js', $out );
 533                         }
 534                 }
 535         }
 536
 537         /* Static Methods */
 538
 539         /**
 540          * Returns JS code to call to mediaWiki.loader.implement for a module with
 541          * given properties.
 542          *
 543          * @param $name Module name
 544          * @param $scripts Array: List of JavaScript code snippets to be executed after the
 545          *     module is loaded
 546          * @param $styles Array: List of CSS strings keyed by media type
 547          * @param $messages Mixed: List of messages associated with this module. May either be an
 548          *     associative array mapping message key to value, or a JSON-encoded message blob containing
 549          *     the same data, wrapped in an XmlJsCode object.
 550          */
 551         public static function makeLoaderImplementScript( $name, $scripts, $styles, $messages ) {
 552                 if ( is_array( $scripts ) ) {
 553                         $scripts = implode( $scripts, "\n" );
 554                 }
 555                 return Xml::encodeJsCall(
 556                         'mediaWiki.loader.implement',
 557                         array(
 558                                 $name,
 559                                 new XmlJsCode( "function( $, mw ) {{$scripts}}" ),
 560                                 (object)$styles,
 561                                 (object)$messages
 562                         ) );
 563         }
 564
 565         /**
 566          * Returns JS code which, when called, will register a given list of messages.
 567          *
 568          * @param $messages Mixed: Either an associative array mapping message key to value, or a
 569          *     JSON-encoded message blob containing the same data, wrapped in an XmlJsCode object.
 570          */
 571         public static function makeMessageSetScript( $messages ) {
 572                 return Xml::encodeJsCall( 'mediaWiki.messages.set', array( (object)$messages ) );
 573         }
 574
 575         /**
 576          * Combines an associative array mapping media type to CSS into a
 577          * single stylesheet with @media blocks.
 578          *
 579          * @param $styles Array: List of CSS strings keyed by media type
 580          */
 581         public static function makeCombinedStyles( array $styles ) {
 582                 $out = '';
 583                 foreach ( $styles as $media => $style ) {
 584                         // Transform the media type based on request params and config
 585                         // The way that this relies on $wgRequest to propagate request params is slightly evil
 586                         $media = OutputPage::transformCssMedia( $media );
 587
 588                         if ( $media === null ) {
 589                                 // Skip
 590                         } else if ( $media === '' || $media == 'all' ) {
 591                                 // Don't output invalid or frivolous @media statements
 592                                 $out .= "$style\n";
 593                         } else {
 594                                 $out .= "@media $media {\n" . str_replace( "\n", "\n\t", "\t" . $style ) . "\n}\n";
 595                         }
 596                 }
 597                 return $out;
 598         }
 599
 600         /**
 601          * Returns a JS call to mediaWiki.loader.state, which sets the state of a
 602          * module or modules to a given value. Has two calling conventions:
 603          *
 604          *    - ResourceLoader::makeLoaderStateScript( $name, $state ):
 605          *         Set the state of a single module called $name to $state
 606          *
 607          *    - ResourceLoader::makeLoaderStateScript( array( $name => $state, ... ) ):
 608          *         Set the state of modules with the given names to the given states
 609          */
 610         public static function makeLoaderStateScript( $name, $state = null ) {
 611                 if ( is_array( $name ) ) {
 612                         return Xml::encodeJsCall( 'mediaWiki.loader.state', array( $name ) );
 613                 } else {
 614                         return Xml::encodeJsCall( 'mediaWiki.loader.state', array( $name, $state ) );
 615                 }
 616         }
 617
 618         /**
 619          * Returns JS code which calls the script given by $script. The script will
 620          * be called with local variables name, version, dependencies and group,
 621          * which will have values corresponding to $name, $version, $dependencies
 622          * and $group as supplied.
 623          *
 624          * @param $name String: Module name
 625          * @param $version Integer: Module version number as a timestamp
 626          * @param $dependencies Array: List of module names on which this module depends
 627          * @param $group String: Group which the module is in.
 628          * @param $script String: JavaScript code
 629          */
 630         public static function makeCustomLoaderScript( $name, $version, $dependencies, $group, $script ) {
 631                 $script = str_replace( "\n", "\n\t", trim( $script ) );
 632                 return Xml::encodeJsCall(
 633                         "( function( name, version, dependencies, group ) {\n\t$script\n} )",
 634                         array( $name, $version, $dependencies, $group ) );
 635         }
 636
 637         /**
 638          * Returns JS code which calls mediaWiki.loader.register with the given
 639          * parameters. Has three calling conventions:
 640          *
 641          *   - ResourceLoader::makeLoaderRegisterScript( $name, $version, $dependencies, $group ):
 642          *       Register a single module.
 643          *
 644          *   - ResourceLoader::makeLoaderRegisterScript( array( $name1, $name2 ) ):
 645          *       Register modules with the given names.
 646          *
 647          *   - ResourceLoader::makeLoaderRegisterScript( array(
 648          *        array( $name1, $version1, $dependencies1, $group1 ),
 649          *        array( $name2, $version2, $dependencies1, $group2 ),
 650          *        ...
 651          *     ) ):
 652          *        Registers modules with the given names and parameters.
 653          *
 654          * @param $name String: Module name
 655          * @param $version Integer: Module version number as a timestamp
 656          * @param $dependencies Array: List of module names on which this module depends
 657          * @param $group String: group which the module is in.
 658          */
 659         public static function makeLoaderRegisterScript( $name, $version = null,
 660                 $dependencies = null, $group = null )
 661         {
 662                 if ( is_array( $name ) ) {
 663                         return Xml::encodeJsCall( 'mediaWiki.loader.register', array( $name ) );
 664                 } else {
 665                         $version = (int) $version > 1 ? (int) $version : 1;
 666                         return Xml::encodeJsCall( 'mediaWiki.loader.register',
 667                                 array( $name, $version, $dependencies, $group ) );
 668                 }
 669         }
 670
 671         /**
 672          * Returns JS code which runs given JS code if the client-side framework is
 673          * present.
 674          *
 675          * @param $script String: JavaScript code
 676          */
 677         public static function makeLoaderConditionalScript( $script ) {
 678                 $script = str_replace( "\n", "\n\t", trim( $script ) );
 679                 return "if ( window.mediaWiki ) {\n\t$script\n}\n";
 680         }
 681
 682         /**
 683          * Returns JS code which will set the MediaWiki configuration array to
 684          * the given value.
 685          *
 686          * @param $configuration Array: List of configuration values keyed by variable name
 687          */
 688         public static function makeConfigSetScript( array $configuration ) {
 689                 return Xml::encodeJsCall( 'mediaWiki.config.set', array( $configuration ) );
 690         }
 691
 692         /**
 693          * Determine whether debug mode was requested
 694          * Order of priority is 1) request param, 2) cookie, 3) $wg setting
 695          * @return bool
 696          */
 697         public static function inDebugMode() {
 698                 global $wgRequest, $wgResourceLoaderDebug;
 699                 static $retval = null;
 700                 if ( !is_null( $retval ) )
 701                         return $retval;
 702                 return $retval = $wgRequest->getFuzzyBool( 'debug',
 703                         $wgRequest->getCookie( 'resourceLoaderDebug', '', $wgResourceLoaderDebug ) );
 704         }
 705 }