includes/resourceloader/ResourceLoaderFileModule.php

   1 <?php
   2 /**
   3  * Resource loader module based on local JavaScript/CSS files.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @author Trevor Parscal
  22  * @author Roan Kattouw
  23  */
  24
  25 /**
  26  * ResourceLoader module based on local JavaScript/CSS files.
  27  */
  28 class ResourceLoaderFileModule extends ResourceLoaderModule {
  29         /* Protected Members */
  30
  31         /** @var string Local base path, see __construct() */
  32         protected $localBasePath = '';
  33
  34         /** @var string Remote base path, see __construct() */
  35         protected $remoteBasePath = '';
  36
  37         /** @var array Saves a list of the templates named by the modules. */
  38         protected $templates = array();
  39
  40         /**
  41          * @var array List of paths to JavaScript files to always include
  42          * @par Usage:
  43          * @code
  44          * array( [file-path], [file-path], ... )
  45          * @endcode
  46          */
  47         protected $scripts = array();
  48
  49         /**
  50          * @var array List of JavaScript files to include when using a specific language
  51          * @par Usage:
  52          * @code
  53          * array( [language-code] => array( [file-path], [file-path], ... ), ... )
  54          * @endcode
  55          */
  56         protected $languageScripts = array();
  57
  58         /**
  59          * @var array List of JavaScript files to include when using a specific skin
  60          * @par Usage:
  61          * @code
  62          * array( [skin-name] => array( [file-path], [file-path], ... ), ... )
  63          * @endcode
  64          */
  65         protected $skinScripts = array();
  66
  67         /**
  68          * @var array List of paths to JavaScript files to include in debug mode
  69          * @par Usage:
  70          * @code
  71          * array( [skin-name] => array( [file-path], [file-path], ... ), ... )
  72          * @endcode
  73          */
  74         protected $debugScripts = array();
  75
  76         /**
  77          * @var array List of paths to JavaScript files to include in the startup module
  78          * @par Usage:
  79          * @code
  80          * array( [file-path], [file-path], ... )
  81          * @endcode
  82          */
  83         protected $loaderScripts = array();
  84
  85         /**
  86          * @var array List of paths to CSS files to always include
  87          * @par Usage:
  88          * @code
  89          * array( [file-path], [file-path], ... )
  90          * @endcode
  91          */
  92         protected $styles = array();
  93
  94         /**
  95          * @var array List of paths to CSS files to include when using specific skins
  96          * @par Usage:
  97          * @code
  98          * array( [file-path], [file-path], ... )
  99          * @endcode
 100          */
 101         protected $skinStyles = array();
 102
 103         /**
 104          * @var array List of modules this module depends on
 105          * @par Usage:
 106          * @code
 107          * array( [file-path], [file-path], ... )
 108          * @endcode
 109          */
 110         protected $dependencies = array();
 111
 112         /**
 113          * @var string File name containing the body of the skip function
 114          */
 115         protected $skipFunction = null;
 116
 117         /**
 118          * @var array List of message keys used by this module
 119          * @par Usage:
 120          * @code
 121          * array( [message-key], [message-key], ... )
 122          * @endcode
 123          */
 124         protected $messages = array();
 125
 126         /** @var string Name of group to load this module in */
 127         protected $group;
 128
 129         /** @var string Position on the page to load this module at */
 130         protected $position = 'bottom';
 131
 132         /** @var bool Link to raw files in debug mode */
 133         protected $debugRaw = true;
 134
 135         /** @var bool Whether mw.loader.state() call should be omitted */
 136         protected $raw = false;
 137
 138         protected $targets = array( 'desktop' );
 139
 140         /**
 141          * @var bool Whether getStyleURLsForDebug should return raw file paths,
 142          * or return load.php urls
 143          */
 144         protected $hasGeneratedStyles = false;
 145
 146         /**
 147          * @var array Cache for mtime
 148          * @par Usage:
 149          * @code
 150          * array( [hash] => [mtime], [hash] => [mtime], ... )
 151          * @endcode
 152          */
 153         protected $modifiedTime = array();
 154
 155         /**
 156          * @var array Place where readStyleFile() tracks file dependencies
 157          * @par Usage:
 158          * @code
 159          * array( [file-path], [file-path], ... )
 160          * @endcode
 161          */
 162         protected $localFileRefs = array();
 163
 164         /* Methods */
 165
 166         /**
 167          * Constructs a new module from an options array.
 168          *
 169          * @param array $options List of options; if not given or empty, an empty module will be
 170          *     constructed
 171          * @param string $localBasePath Base path to prepend to all local paths in $options. Defaults
 172          *     to $IP
 173          * @param string $remoteBasePath Base path to prepend to all remote paths in $options. Defaults
 174          *     to $wgResourceBasePath
 175          *
 176          * Below is a description for the $options array:
 177          * @throws MWException
 178          * @par Construction options:
 179          * @code
 180          *     array(
 181          *         // Base path to prepend to all local paths in $options. Defaults to $IP
 182          *         'localBasePath' => [base path],
 183          *         // Base path to prepend to all remote paths in $options. Defaults to $wgResourceBasePath
 184          *         'remoteBasePath' => [base path],
 185          *         // Equivalent of remoteBasePath, but relative to $wgExtensionAssetsPath
 186          *         'remoteExtPath' => [base path],
 187          *         // Equivalent of remoteBasePath, but relative to $wgStylePath
 188          *         'remoteSkinPath' => [base path],
 189          *         // Scripts to always include
 190          *         'scripts' => [file path string or array of file path strings],
 191          *         // Scripts to include in specific language contexts
 192          *         'languageScripts' => array(
 193          *             [language code] => [file path string or array of file path strings],
 194          *         ),
 195          *         // Scripts to include in specific skin contexts
 196          *         'skinScripts' => array(
 197          *             [skin name] => [file path string or array of file path strings],
 198          *         ),
 199          *         // Scripts to include in debug contexts
 200          *         'debugScripts' => [file path string or array of file path strings],
 201          *         // Scripts to include in the startup module
 202          *         'loaderScripts' => [file path string or array of file path strings],
 203          *         // Modules which must be loaded before this module
 204          *         'dependencies' => [module name string or array of module name strings],
 205          *         'templates' => array(
 206          *             [template alias with file.ext] => [file path to a template file],
 207          *         ),
 208          *         // Styles to always load
 209          *         'styles' => [file path string or array of file path strings],
 210          *         // Styles to include in specific skin contexts
 211          *         'skinStyles' => array(
 212          *             [skin name] => [file path string or array of file path strings],
 213          *         ),
 214          *         // Messages to always load
 215          *         'messages' => [array of message key strings],
 216          *         // Group which this module should be loaded together with
 217          *         'group' => [group name string],
 218          *         // Position on the page to load this module at
 219          *         'position' => ['bottom' (default) or 'top']
 220          *         // Function that, if it returns true, makes the loader skip this module.
 221          *         // The file must contain valid JavaScript for execution in a private function.
 222          *         // The file must not contain the "function () {" and "}" wrapper though.
 223          *         'skipFunction' => [file path]
 224          *     )
 225          * @endcode
 226          */
 227         public function __construct(
 228                 $options = array(),
 229                 $localBasePath = null,
 230                 $remoteBasePath = null
 231         ) {
 232                 // Flag to decide whether to automagically add the mediawiki.template module
 233                 $hasTemplates = false;
 234                 // localBasePath and remoteBasePath both have unbelievably long fallback chains
 235                 // and need to be handled separately.
 236                 list( $this->localBasePath, $this->remoteBasePath ) =
 237                         self::extractBasePaths( $options, $localBasePath, $remoteBasePath );
 238
 239                 // Extract, validate and normalise remaining options
 240                 foreach ( $options as $member => $option ) {
 241                         switch ( $member ) {
 242                                 // Lists of file paths
 243                                 case 'scripts':
 244                                 case 'debugScripts':
 245                                 case 'loaderScripts':
 246                                 case 'styles':
 247                                         $this->{$member} = (array)$option;
 248                                         break;
 249                                 case 'templates':
 250                                         $hasTemplates = true;
 251                                         $this->{$member} = (array)$option;
 252                                         break;
 253                                 // Collated lists of file paths
 254                                 case 'languageScripts':
 255                                 case 'skinScripts':
 256                                 case 'skinStyles':
 257                                         if ( !is_array( $option ) ) {
 258                                                 throw new MWException(
 259                                                         "Invalid collated file path list error. " .
 260                                                         "'$option' given, array expected."
 261                                                 );
 262                                         }
 263                                         foreach ( $option as $key => $value ) {
 264                                                 if ( !is_string( $key ) ) {
 265                                                         throw new MWException(
 266                                                                 "Invalid collated file path list key error. " .
 267                                                                 "'$key' given, string expected."
 268                                                         );
 269                                                 }
 270                                                 $this->{$member}[$key] = (array)$value;
 271                                         }
 272                                         break;
 273                                 // Lists of strings
 274                                 case 'dependencies':
 275                                 case 'messages':
 276                                 case 'targets':
 277                                         // Normalise
 278                                         $option = array_values( array_unique( (array)$option ) );
 279                                         sort( $option );
 280
 281                                         $this->{$member} = $option;
 282                                         break;
 283                                 // Single strings
 284                                 case 'group':
 285                                 case 'position':
 286                                 case 'skipFunction':
 287                                         $this->{$member} = (string)$option;
 288                                         break;
 289                                 // Single booleans
 290                                 case 'debugRaw':
 291                                 case 'raw':
 292                                         $this->{$member} = (bool)$option;
 293                                         break;
 294                         }
 295                 }
 296                 if ( $hasTemplates ) {
 297                         $this->dependencies[] = 'mediawiki.template';
 298                 }
 299         }
 300
 301         /**
 302          * Extract a pair of local and remote base paths from module definition information.
 303          * Implementation note: the amount of global state used in this function is staggering.
 304          *
 305          * @param array $options Module definition
 306          * @param string $localBasePath Path to use if not provided in module definition. Defaults
 307          *     to $IP
 308          * @param string $remoteBasePath Path to use if not provided in module definition. Defaults
 309          *     to $wgResourceBasePath
 310          * @return array Array( localBasePath, remoteBasePath )
 311          */
 312         public static function extractBasePaths(
 313                 $options = array(),
 314                 $localBasePath = null,
 315                 $remoteBasePath = null
 316         ) {
 317                 global $IP, $wgResourceBasePath;
 318
 319                 // The different ways these checks are done, and their ordering, look very silly,
 320                 // but were preserved for backwards-compatibility just in case. Tread lightly.
 321
 322                 if ( $localBasePath === null ) {
 323                         $localBasePath = $IP;
 324                 }
 325                 if ( $remoteBasePath === null ) {
 326                         $remoteBasePath = $wgResourceBasePath;
 327                 }
 328
 329                 if ( isset( $options['remoteExtPath'] ) ) {
 330                         global $wgExtensionAssetsPath;
 331                         $remoteBasePath = $wgExtensionAssetsPath . '/' . $options['remoteExtPath'];
 332                 }
 333
 334                 if ( isset( $options['remoteSkinPath'] ) ) {
 335                         global $wgStylePath;
 336                         $remoteBasePath = $wgStylePath . '/' . $options['remoteSkinPath'];
 337                 }
 338
 339                 if ( array_key_exists( 'localBasePath', $options ) ) {
 340                         $localBasePath = (string)$options['localBasePath'];
 341                 }
 342
 343                 if ( array_key_exists( 'remoteBasePath', $options ) ) {
 344                         $remoteBasePath = (string)$options['remoteBasePath'];
 345                 }
 346
 347                 // Make sure the remote base path is a complete valid URL,
 348                 // but possibly protocol-relative to avoid cache pollution
 349                 $remoteBasePath = wfExpandUrl( $remoteBasePath, PROTO_RELATIVE );
 350
 351                 return array( $localBasePath, $remoteBasePath );
 352         }
 353
 354         /**
 355          * Gets all scripts for a given context concatenated together.
 356          *
 357          * @param ResourceLoaderContext $context Context in which to generate script
 358          * @return string JavaScript code for $context
 359          */
 360         public function getScript( ResourceLoaderContext $context ) {
 361                 $files = $this->getScriptFiles( $context );
 362                 return $this->readScriptFiles( $files );
 363         }
 364
 365         /**
 366          * @param ResourceLoaderContext $context
 367          * @return array
 368          */
 369         public function getScriptURLsForDebug( ResourceLoaderContext $context ) {
 370                 $urls = array();
 371                 foreach ( $this->getScriptFiles( $context ) as $file ) {
 372                         $urls[] = $this->getRemotePath( $file );
 373                 }
 374                 return $urls;
 375         }
 376
 377         /**
 378          * @return bool
 379          */
 380         public function supportsURLLoading() {
 381                 return $this->debugRaw;
 382         }
 383
 384         /**
 385          * Get loader script.
 386          *
 387          * @return string|bool JavaScript code to be added to startup module
 388          */
 389         public function getLoaderScript() {
 390                 if ( count( $this->loaderScripts ) === 0 ) {
 391                         return false;
 392                 }
 393                 return $this->readScriptFiles( $this->loaderScripts );
 394         }
 395
 396         /**
 397          * Get all styles for a given context.
 398          *
 399          * @param ResourceLoaderContext $context
 400          * @return array CSS code for $context as an associative array mapping media type to CSS text.
 401          */
 402         public function getStyles( ResourceLoaderContext $context ) {
 403                 $styles = $this->readStyleFiles(
 404                         $this->getStyleFiles( $context ),
 405                         $this->getFlip( $context ),
 406                         $context
 407                 );
 408                 // Collect referenced files
 409                 $this->localFileRefs = array_unique( $this->localFileRefs );
 410                 // If the list has been modified since last time we cached it, update the cache
 411                 try {
 412                         if ( $this->localFileRefs !== $this->getFileDependencies( $context->getSkin() ) ) {
 413                                 $dbw = wfGetDB( DB_MASTER );
 414                                 $dbw->replace( 'module_deps',
 415                                         array( array( 'md_module', 'md_skin' ) ), array(
 416                                                 'md_module' => $this->getName(),
 417                                                 'md_skin' => $context->getSkin(),
 418                                                 'md_deps' => FormatJson::encode( $this->localFileRefs ),
 419                                         )
 420                                 );
 421                         }
 422                 } catch ( Exception $e ) {
 423                         wfDebugLog( 'resourceloader', __METHOD__ . ": failed to update DB: $e" );
 424                 }
 425                 return $styles;
 426         }
 427
 428         /**
 429          * @param ResourceLoaderContext $context
 430          * @return array
 431          */
 432         public function getStyleURLsForDebug( ResourceLoaderContext $context ) {
 433                 if ( $this->hasGeneratedStyles ) {
 434                         // Do the default behaviour of returning a url back to load.php
 435                         // but with only=styles.
 436                         return parent::getStyleURLsForDebug( $context );
 437                 }
 438                 // Our module consists entirely of real css files,
 439                 // in debug mode we can load those directly.
 440                 $urls = array();
 441                 foreach ( $this->getStyleFiles( $context ) as $mediaType => $list ) {
 442                         $urls[$mediaType] = array();
 443                         foreach ( $list as $file ) {
 444                                 $urls[$mediaType][] = $this->getRemotePath( $file );
 445                         }
 446                 }
 447                 return $urls;
 448         }
 449
 450         /**
 451          * Gets list of message keys used by this module.
 452          *
 453          * @return array List of message keys
 454          */
 455         public function getMessages() {
 456                 return $this->messages;
 457         }
 458
 459         /**
 460          * Gets the name of the group this module should be loaded in.
 461          *
 462          * @return string Group name
 463          */
 464         public function getGroup() {
 465                 return $this->group;
 466         }
 467
 468         /**
 469          * @return string
 470          */
 471         public function getPosition() {
 472                 return $this->position;
 473         }
 474
 475         /**
 476          * Gets list of names of modules this module depends on.
 477          *
 478          * @return array List of module names
 479          */
 480         public function getDependencies() {
 481                 return $this->dependencies;
 482         }
 483
 484         /**
 485          * Get the skip function.
 486          * @return null|string
 487          * @throws MWException
 488          */
 489         public function getSkipFunction() {
 490                 if ( !$this->skipFunction ) {
 491                         return null;
 492                 }
 493
 494                 $localPath = $this->getLocalPath( $this->skipFunction );
 495                 if ( !file_exists( $localPath ) ) {
 496                         throw new MWException( __METHOD__ . ": skip function file not found: \"$localPath\"" );
 497                 }
 498                 $contents = file_get_contents( $localPath );
 499                 if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 500                         $contents = $this->validateScriptFile( $localPath, $contents );
 501                 }
 502                 return $contents;
 503         }
 504
 505         /**
 506          * @return bool
 507          */
 508         public function isRaw() {
 509                 return $this->raw;
 510         }
 511
 512         /**
 513          * Get the last modified timestamp of this module.
 514          *
 515          * Last modified timestamps are calculated from the highest last modified
 516          * timestamp of this module's constituent files as well as the files it
 517          * depends on. This function is context-sensitive, only performing
 518          * calculations on files relevant to the given language, skin and debug
 519          * mode.
 520          *
 521          * @param ResourceLoaderContext $context Context in which to calculate
 522          *     the modified time
 523          * @return int UNIX timestamp
 524          * @see ResourceLoaderModule::getFileDependencies
 525          */
 526         public function getModifiedTime( ResourceLoaderContext $context ) {
 527                 if ( isset( $this->modifiedTime[$context->getHash()] ) ) {
 528                         return $this->modifiedTime[$context->getHash()];
 529                 }
 530
 531                 $files = array();
 532
 533                 // Flatten style files into $files
 534                 $styles = self::collateFilePathListByOption( $this->styles, 'media', 'all' );
 535                 foreach ( $styles as $styleFiles ) {
 536                         $files = array_merge( $files, $styleFiles );
 537                 }
 538
 539                 $skinFiles = self::collateFilePathListByOption(
 540                         self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 541                         'media',
 542                         'all'
 543                 );
 544                 foreach ( $skinFiles as $styleFiles ) {
 545                         $files = array_merge( $files, $styleFiles );
 546                 }
 547
 548                 // Final merge, this should result in a master list of dependent files
 549                 $files = array_merge(
 550                         $files,
 551                         $this->scripts,
 552                         $this->templates,
 553                         $context->getDebug() ? $this->debugScripts : array(),
 554                         $this->getLanguageScripts( $context->getLanguage() ),
 555                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' ),
 556                         $this->loaderScripts
 557                 );
 558                 if ( $this->skipFunction ) {
 559                         $files[] = $this->skipFunction;
 560                 }
 561                 $files = array_map( array( $this, 'getLocalPath' ), $files );
 562                 // File deps need to be treated separately because they're already prefixed
 563                 $files = array_merge( $files, $this->getFileDependencies( $context->getSkin() ) );
 564
 565                 // If a module is nothing but a list of dependencies, we need to avoid
 566                 // giving max() an empty array
 567                 if ( count( $files ) === 0 ) {
 568                         $this->modifiedTime[$context->getHash()] = 1;
 569                         return $this->modifiedTime[$context->getHash()];
 570                 }
 571
 572                 wfProfileIn( __METHOD__ . '-filemtime' );
 573                 $filesMtime = max( array_map( array( __CLASS__, 'safeFilemtime' ), $files ) );
 574                 wfProfileOut( __METHOD__ . '-filemtime' );
 575
 576                 $this->modifiedTime[$context->getHash()] = max(
 577                         $filesMtime,
 578                         $this->getMsgBlobMtime( $context->getLanguage() ),
 579                         $this->getDefinitionMtime( $context )
 580                 );
 581
 582                 return $this->modifiedTime[$context->getHash()];
 583         }
 584
 585         /**
 586          * Get the definition summary for this module.
 587          *
 588          * @param ResourceLoaderContext $context
 589          * @return array
 590          */
 591         public function getDefinitionSummary( ResourceLoaderContext $context ) {
 592                 $summary = array(
 593                         'class' => get_class( $this ),
 594                 );
 595                 foreach ( array(
 596                         'scripts',
 597                         'debugScripts',
 598                         'loaderScripts',
 599                         'styles',
 600                         'languageScripts',
 601                         'skinScripts',
 602                         'skinStyles',
 603                         'dependencies',
 604                         'messages',
 605                         'targets',
 606                         'templates',
 607                         'group',
 608                         'position',
 609                         'skipFunction',
 610                         'localBasePath',
 611                         'remoteBasePath',
 612                         'debugRaw',
 613                         'raw',
 614                 ) as $member ) {
 615                         $summary[$member] = $this->{$member};
 616                 };
 617                 return $summary;
 618         }
 619
 620         /* Protected Methods */
 621
 622         /**
 623          * @param string|ResourceLoaderFilePath $path
 624          * @return string
 625          */
 626         protected function getLocalPath( $path ) {
 627                 if ( $path instanceof ResourceLoaderFilePath ) {
 628                         return $path->getLocalPath();
 629                 }
 630
 631                 return "{$this->localBasePath}/$path";
 632         }
 633
 634         /**
 635          * @param string|ResourceLoaderFilePath $path
 636          * @return string
 637          */
 638         protected function getRemotePath( $path ) {
 639                 if ( $path instanceof ResourceLoaderFilePath ) {
 640                         return $path->getRemotePath();
 641                 }
 642
 643                 return "{$this->remoteBasePath}/$path";
 644         }
 645
 646         /**
 647          * Infer the stylesheet language from a stylesheet file path.
 648          *
 649          * @since 1.22
 650          * @param string $path
 651          * @return string The stylesheet language name
 652          */
 653         public function getStyleSheetLang( $path ) {
 654                 return preg_match( '/\.less$/i', $path ) ? 'less' : 'css';
 655         }
 656
 657         /**
 658          * Collates file paths by option (where provided).
 659          *
 660          * @param array $list List of file paths in any combination of index/path
 661          *     or path/options pairs
 662          * @param string $option Option name
 663          * @param mixed $default Default value if the option isn't set
 664          * @return array List of file paths, collated by $option
 665          */
 666         protected static function collateFilePathListByOption( array $list, $option, $default ) {
 667                 $collatedFiles = array();
 668                 foreach ( (array)$list as $key => $value ) {
 669                         if ( is_int( $key ) ) {
 670                                 // File name as the value
 671                                 if ( !isset( $collatedFiles[$default] ) ) {
 672                                         $collatedFiles[$default] = array();
 673                                 }
 674                                 $collatedFiles[$default][] = $value;
 675                         } elseif ( is_array( $value ) ) {
 676                                 // File name as the key, options array as the value
 677                                 $optionValue = isset( $value[$option] ) ? $value[$option] : $default;
 678                                 if ( !isset( $collatedFiles[$optionValue] ) ) {
 679                                         $collatedFiles[$optionValue] = array();
 680                                 }
 681                                 $collatedFiles[$optionValue][] = $key;
 682                         }
 683                 }
 684                 return $collatedFiles;
 685         }
 686
 687         /**
 688          * Get a list of element that match a key, optionally using a fallback key.
 689          *
 690          * @param array $list List of lists to select from
 691          * @param string $key Key to look for in $map
 692          * @param string $fallback Key to look for in $list if $key doesn't exist
 693          * @return array List of elements from $map which matched $key or $fallback,
 694          *  or an empty list in case of no match
 695          */
 696         protected static function tryForKey( array $list, $key, $fallback = null ) {
 697                 if ( isset( $list[$key] ) && is_array( $list[$key] ) ) {
 698                         return $list[$key];
 699                 } elseif ( is_string( $fallback )
 700                         && isset( $list[$fallback] )
 701                         && is_array( $list[$fallback] )
 702                 ) {
 703                         return $list[$fallback];
 704                 }
 705                 return array();
 706         }
 707
 708         /**
 709          * Get a list of file paths for all scripts in this module, in order of proper execution.
 710          *
 711          * @param ResourceLoaderContext $context
 712          * @return array List of file paths
 713          */
 714         protected function getScriptFiles( ResourceLoaderContext $context ) {
 715                 $files = array_merge(
 716                         $this->scripts,
 717                         $this->getLanguageScripts( $context->getLanguage() ),
 718                         self::tryForKey( $this->skinScripts, $context->getSkin(), 'default' )
 719                 );
 720                 if ( $context->getDebug() ) {
 721                         $files = array_merge( $files, $this->debugScripts );
 722                 }
 723
 724                 return array_unique( $files, SORT_REGULAR );
 725         }
 726
 727         /**
 728          * Get the set of language scripts for the given language,
 729          * possibly using a fallback language.
 730          *
 731          * @param string $lang
 732          * @return array
 733          */
 734         private function getLanguageScripts( $lang ) {
 735                 $scripts = self::tryForKey( $this->languageScripts, $lang );
 736                 if ( $scripts ) {
 737                         return $scripts;
 738                 }
 739                 $fallbacks = Language::getFallbacksFor( $lang );
 740                 foreach ( $fallbacks as $lang ) {
 741                         $scripts = self::tryForKey( $this->languageScripts, $lang );
 742                         if ( $scripts ) {
 743                                 return $scripts;
 744                         }
 745                 }
 746
 747                 return array();
 748         }
 749
 750         /**
 751          * Get a list of file paths for all styles in this module, in order of proper inclusion.
 752          *
 753          * @param ResourceLoaderContext $context
 754          * @return array List of file paths
 755          */
 756         public function getStyleFiles( ResourceLoaderContext $context ) {
 757                 return array_merge_recursive(
 758                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 759                         self::collateFilePathListByOption(
 760                                 self::tryForKey( $this->skinStyles, $context->getSkin(), 'default' ),
 761                                 'media',
 762                                 'all'
 763                         )
 764                 );
 765         }
 766
 767         /**
 768          * Gets a list of file paths for all skin styles in the module used by
 769          * the skin.
 770          *
 771          * @param string $skinName The name of the skin
 772          * @return array A list of file paths collated by media type
 773          */
 774         protected function getSkinStyleFiles( $skinName ) {
 775                 return self::collateFilePathListByOption(
 776                         self::tryForKey( $this->skinStyles, $skinName ),
 777                         'media',
 778                         'all'
 779                 );
 780         }
 781
 782         /**
 783          * Gets a list of file paths for all skin style files in the module,
 784          * for all available skins.
 785          *
 786          * @return array A list of file paths collated by media type
 787          */
 788         protected function getAllSkinStyleFiles() {
 789                 $styleFiles = array();
 790                 $internalSkinNames = array_keys( Skin::getSkinNames() );
 791                 $internalSkinNames[] = 'default';
 792
 793                 foreach ( $internalSkinNames as $internalSkinName ) {
 794                         $styleFiles = array_merge_recursive(
 795                                 $styleFiles,
 796                                 $this->getSkinStyleFiles( $internalSkinName )
 797                         );
 798                 }
 799
 800                 return $styleFiles;
 801         }
 802
 803         /**
 804          * Returns all style files and all skin style files used by this module.
 805          *
 806          * @return array
 807          */
 808         public function getAllStyleFiles() {
 809                 $collatedStyleFiles = array_merge_recursive(
 810                         self::collateFilePathListByOption( $this->styles, 'media', 'all' ),
 811                         $this->getAllSkinStyleFiles()
 812                 );
 813
 814                 $result = array();
 815
 816                 foreach ( $collatedStyleFiles as $media => $styleFiles ) {
 817                         foreach ( $styleFiles as $styleFile ) {
 818                                 $result[] = $this->getLocalPath( $styleFile );
 819                         }
 820                 }
 821
 822                 return $result;
 823         }
 824
 825         /**
 826          * Gets the contents of a list of JavaScript files.
 827          *
 828          * @param array $scripts List of file paths to scripts to read, remap and concetenate
 829          * @throws MWException
 830          * @return string Concatenated and remapped JavaScript data from $scripts
 831          */
 832         protected function readScriptFiles( array $scripts ) {
 833                 if ( empty( $scripts ) ) {
 834                         return '';
 835                 }
 836                 $js = '';
 837                 foreach ( array_unique( $scripts, SORT_REGULAR ) as $fileName ) {
 838                         $localPath = $this->getLocalPath( $fileName );
 839                         if ( !file_exists( $localPath ) ) {
 840                                 throw new MWException( __METHOD__ . ": script file not found: \"$localPath\"" );
 841                         }
 842                         $contents = file_get_contents( $localPath );
 843                         if ( $this->getConfig()->get( 'ResourceLoaderValidateStaticJS' ) ) {
 844                                 // Static files don't really need to be checked as often; unlike
 845                                 // on-wiki module they shouldn't change unexpectedly without
 846                                 // admin interference.
 847                                 $contents = $this->validateScriptFile( $fileName, $contents );
 848                         }
 849                         $js .= $contents . "\n";
 850                 }
 851                 return $js;
 852         }
 853
 854         /**
 855          * Gets the contents of a list of CSS files.
 856          *
 857          * @param array $styles List of media type/list of file paths pairs, to read, remap and
 858          * concetenate
 859          * @param bool $flip
 860          * @param ResourceLoaderContext $context (optional)
 861          *
 862          * @throws MWException
 863          * @return array List of concatenated and remapped CSS data from $styles,
 864          *     keyed by media type
 865          */
 866         public function readStyleFiles( array $styles, $flip, $context = null ) {
 867                 if ( empty( $styles ) ) {
 868                         return array();
 869                 }
 870                 foreach ( $styles as $media => $files ) {
 871                         $uniqueFiles = array_unique( $files, SORT_REGULAR );
 872                         $styleFiles = array();
 873                         foreach ( $uniqueFiles as $file ) {
 874                                 $styleFiles[] = $this->readStyleFile( $file, $flip, $context );
 875                         }
 876                         $styles[$media] = implode( "\n", $styleFiles );
 877                 }
 878                 return $styles;
 879         }
 880
 881         /**
 882          * Reads a style file.
 883          *
 884          * This method can be used as a callback for array_map()
 885          *
 886          * @param string $path File path of style file to read
 887          * @param bool $flip
 888          * @param ResourceLoaderContext $context (optional)
 889          *
 890          * @return string CSS data in script file
 891          * @throws MWException If the file doesn't exist
 892          */
 893         protected function readStyleFile( $path, $flip, $context = null ) {
 894                 $localPath = $this->getLocalPath( $path );
 895                 $remotePath = $this->getRemotePath( $path );
 896                 if ( !file_exists( $localPath ) ) {
 897                         $msg = __METHOD__ . ": style file not found: \"$localPath\"";
 898                         wfDebugLog( 'resourceloader', $msg );
 899                         throw new MWException( $msg );
 900                 }
 901
 902                 if ( $this->getStyleSheetLang( $localPath ) === 'less' ) {
 903                         $compiler = $this->getLessCompiler( $context );
 904                         $style = $this->compileLessFile( $localPath, $compiler );
 905                         $this->hasGeneratedStyles = true;
 906                 } else {
 907                         $style = file_get_contents( $localPath );
 908                 }
 909
 910                 if ( $flip ) {
 911                         $style = CSSJanus::transform( $style, true, false );
 912                 }
 913                 $localDir = dirname( $localPath );
 914                 $remoteDir = dirname( $remotePath );
 915                 // Get and register local file references
 916                 $this->localFileRefs = array_merge(
 917                         $this->localFileRefs,
 918                         CSSMin::getLocalFileReferences( $style, $localDir )
 919                 );
 920                 return CSSMin::remap(
 921                         $style, $localDir, $remoteDir, true
 922                 );
 923         }
 924
 925         /**
 926          * Get whether CSS for this module should be flipped
 927          * @param ResourceLoaderContext $context
 928          * @return bool
 929          */
 930         public function getFlip( $context ) {
 931                 return $context->getDirection() === 'rtl';
 932         }
 933
 934         /**
 935          * Get target(s) for the module, eg ['desktop'] or ['desktop', 'mobile']
 936          *
 937          * @return array Array of strings
 938          */
 939         public function getTargets() {
 940                 return $this->targets;
 941         }
 942
 943         /**
 944          * Compile a LESS file into CSS.
 945          *
 946          * Keeps track of all used files and adds them to localFileRefs.
 947          *
 948          * @since 1.22
 949          * @throws Exception If lessc encounters a parse error
 950          * @param string $fileName File path of LESS source
 951          * @param lessc $compiler Compiler to use, if not default
 952          * @return string CSS source
 953          */
 954         protected function compileLessFile( $fileName, $compiler = null ) {
 955                 if ( !$compiler ) {
 956                         $compiler = $this->getLessCompiler();
 957                 }
 958                 $result = $compiler->compileFile( $fileName );
 959                 $this->localFileRefs += array_keys( $compiler->allParsedFiles() );
 960                 return $result;
 961         }
 962
 963         /**
 964          * Get a LESS compiler instance for this module in given context.
 965          *
 966          * Just calls ResourceLoader::getLessCompiler() by default to get a global compiler.
 967          *
 968          * @param ResourceLoaderContext $context
 969          * @throws MWException
 970          * @since 1.24
 971          * @return lessc
 972          */
 973         protected function getLessCompiler( ResourceLoaderContext $context = null ) {
 974                 return ResourceLoader::getLessCompiler( $this->getConfig() );
 975         }
 976
 977         /**
 978          * Takes named templates by the module and returns an array mapping.
 979          * @return array of templates mapping template alias to content
 980          * @throws MWException
 981          */
 982         public function getTemplates() {
 983                 $templates = array();
 984
 985                 foreach ( $this->templates as $alias => $templatePath ) {
 986                         // Alias is optional
 987                         if ( is_int( $alias ) ) {
 988                                 $alias = $templatePath;
 989                         }
 990                         $localPath = $this->getLocalPath( $templatePath );
 991                         if ( file_exists( $localPath ) ) {
 992                                 $content = file_get_contents( $localPath );
 993                                 $templates[$alias] = $content;
 994                         } else {
 995                                 $msg = __METHOD__ . ": template file not found: \"$localPath\"";
 996                                 wfDebugLog( 'resourceloader', $msg );
 997                                 throw new MWException( $msg );
 998                         }
 999                 }
1000                 return $templates;
1001         }
1002 }