resources/src/mediawiki/mediawiki.Title.js

   1 /*!
   2  * @author Neil Kandalgaonkar, 2010
   3  * @author Timo Tijhof
   4  * @since 1.18
   5  */
   6
   7 ( function ( mw, $ ) {
   8         /**
   9          * Parse titles into an object structure. Note that when using the constructor
  10          * directly, passing invalid titles will result in an exception. Use #newFromText to use the
  11          * logic directly and get null for invalid titles which is easier to work with.
  12          *
  13          * Note that in the constructor and #newFromText method, `namespace` is the **default** namespace
  14          * only, and can be overridden by a namespace prefix in `title`. If you do not want this behavior,
  15          * use #makeTitle. Compare:
  16          *
  17          *     new mw.Title( 'Foo', NS_TEMPLATE ).getPrefixedText();                  // => 'Template:Foo'
  18          *     mw.Title.newFromText( 'Foo', NS_TEMPLATE ).getPrefixedText();          // => 'Template:Foo'
  19          *     mw.Title.makeTitle( NS_TEMPLATE, 'Foo' ).getPrefixedText();            // => 'Template:Foo'
  20          *
  21          *     new mw.Title( 'Category:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Category:Foo'
  22          *     mw.Title.newFromText( 'Category:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Category:Foo'
  23          *     mw.Title.makeTitle( NS_TEMPLATE, 'Category:Foo' ).getPrefixedText();   // => 'Template:Category:Foo'
  24          *
  25          *     new mw.Title( 'Template:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Template:Foo'
  26          *     mw.Title.newFromText( 'Template:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Template:Foo'
  27          *     mw.Title.makeTitle( NS_TEMPLATE, 'Template:Foo' ).getPrefixedText();   // => 'Template:Template:Foo'
  28          *
  29          * @class mw.Title
  30          */
  31
  32         /* Private members */
  33
  34         var
  35                 namespaceIds = mw.config.get( 'wgNamespaceIds' ),
  36
  37                 /**
  38                  * @private
  39                  * @static
  40                  * @property NS_MAIN
  41                  */
  42                 NS_MAIN = namespaceIds[ '' ],
  43
  44                 /**
  45                  * @private
  46                  * @static
  47                  * @property NS_TALK
  48                  */
  49                 NS_TALK = namespaceIds.talk,
  50
  51                 /**
  52                  * @private
  53                  * @static
  54                  * @property NS_SPECIAL
  55                  */
  56                 NS_SPECIAL = namespaceIds.special,
  57
  58                 /**
  59                  * @private
  60                  * @static
  61                  * @property NS_MEDIA
  62                  */
  63                 NS_MEDIA = namespaceIds.media,
  64
  65                 /**
  66                  * @private
  67                  * @static
  68                  * @property NS_FILE
  69                  */
  70                 NS_FILE = namespaceIds.file,
  71
  72                 /**
  73                  * @private
  74                  * @static
  75                  * @property FILENAME_MAX_BYTES
  76                  */
  77                 FILENAME_MAX_BYTES = 240,
  78
  79                 /**
  80                  * @private
  81                  * @static
  82                  * @property TITLE_MAX_BYTES
  83                  */
  84                 TITLE_MAX_BYTES = 255,
  85
  86                 /**
  87                  * Get the namespace id from a namespace name (either from the localized, canonical or alias
  88                  * name).
  89                  *
  90                  * Example: On a German wiki this would return 6 for any of 'File', 'Datei', 'Image' or
  91                  * even 'Bild'.
  92                  *
  93                  * @private
  94                  * @static
  95                  * @method getNsIdByName
  96                  * @param {string} ns Namespace name (case insensitive, leading/trailing space ignored)
  97                  * @return {number|boolean} Namespace id or boolean false
  98                  */
  99                 getNsIdByName = function ( ns ) {
 100                         var id;
 101
 102                         // Don't cast non-strings to strings, because null or undefined should not result in
 103                         // returning the id of a potential namespace called "Null:" (e.g. on null.example.org/wiki)
 104                         // Also, toLowerCase throws exception on null/undefined, because it is a String method.
 105                         if ( typeof ns !== 'string' ) {
 106                                 return false;
 107                         }
 108                         // TODO: Should just use local var namespaceIds here but it
 109                         // breaks test which modify the config
 110                         id = mw.config.get( 'wgNamespaceIds' )[ ns.toLowerCase() ];
 111                         if ( id === undefined ) {
 112                                 return false;
 113                         }
 114                         return id;
 115                 },
 116
 117                 /**
 118                  * @private
 119                  * @method getNamespacePrefix_
 120                  * @param {number} namespace
 121                  * @return {string}
 122                  */
 123                 getNamespacePrefix = function ( namespace ) {
 124                         return namespace === NS_MAIN ?
 125                                 '' :
 126                                 ( mw.config.get( 'wgFormattedNamespaces' )[ namespace ].replace( / /g, '_' ) + ':' );
 127                 },
 128
 129                 rUnderscoreTrim = /^_+|_+$/g,
 130
 131                 rSplit = /^(.+?)_*:_*(.*)$/,
 132
 133                 // See MediaWikiTitleCodec.php#getTitleInvalidRegex
 134                 rInvalid = new RegExp(
 135                         '[^' + mw.config.get( 'wgLegalTitleChars' ) + ']' +
 136                         // URL percent encoding sequences interfere with the ability
 137                         // to round-trip titles -- you can't link to them consistently.
 138                         '|%[0-9A-Fa-f]{2}' +
 139                         // XML/HTML character references produce similar issues.
 140                         '|&[A-Za-z0-9\u0080-\uFFFF]+;' +
 141                         '|&#[0-9]+;' +
 142                         '|&#x[0-9A-Fa-f]+;'
 143                 ),
 144
 145                 // From MediaWikiTitleCodec::splitTitleString() in PHP
 146                 // Note that this is not equivalent to /\s/, e.g. underscore is included, tab is not included.
 147                 rWhitespace = /[ _\u00A0\u1680\u180E\u2000-\u200A\u2028\u2029\u202F\u205F\u3000]+/g,
 148
 149                 // From MediaWikiTitleCodec::splitTitleString() in PHP
 150                 rUnicodeBidi = /[\u200E\u200F\u202A-\u202E]/g,
 151
 152                 /**
 153                  * Slightly modified from Flinfo. Credit goes to Lupo and Flominator.
 154                  * @private
 155                  * @static
 156                  * @property sanitationRules
 157                  */
 158                 sanitationRules = [
 159                         // "signature"
 160                         {
 161                                 pattern: /~{3}/g,
 162                                 replace: '',
 163                                 generalRule: true
 164                         },
 165                         // control characters
 166                         {
 167                                 // eslint-disable-next-line no-control-regex
 168                                 pattern: /[\x00-\x1f\x7f]/g,
 169                                 replace: '',
 170                                 generalRule: true
 171                         },
 172                         // URL encoding (possibly)
 173                         {
 174                                 pattern: /%([0-9A-Fa-f]{2})/g,
 175                                 replace: '% $1',
 176                                 generalRule: true
 177                         },
 178                         // HTML-character-entities
 179                         {
 180                                 pattern: /&(([A-Za-z0-9\x80-\xff]+|#[0-9]+|#x[0-9A-Fa-f]+);)/g,
 181                                 replace: '& $1',
 182                                 generalRule: true
 183                         },
 184                         // slash, colon (not supported by file systems like NTFS/Windows, Mac OS 9 [:], ext4 [/])
 185                         {
 186                                 pattern: new RegExp( '[' + mw.config.get( 'wgIllegalFileChars', '' ) + ']', 'g' ),
 187                                 replace: '-',
 188                                 fileRule: true
 189                         },
 190                         // brackets, greater than
 191                         {
 192                                 pattern: /[}\]>]/g,
 193                                 replace: ')',
 194                                 generalRule: true
 195                         },
 196                         // brackets, lower than
 197                         {
 198                                 pattern: /[{[<]/g,
 199                                 replace: '(',
 200                                 generalRule: true
 201                         },
 202                         // everything that wasn't covered yet
 203                         {
 204                                 pattern: new RegExp( rInvalid.source, 'g' ),
 205                                 replace: '-',
 206                                 generalRule: true
 207                         },
 208                         // directory structures
 209                         {
 210                                 pattern: /^(\.|\.\.|\.\/.*|\.\.\/.*|.*\/\.\/.*|.*\/\.\.\/.*|.*\/\.|.*\/\.\.)$/g,
 211                                 replace: '',
 212                                 generalRule: true
 213                         }
 214                 ],
 215
 216                 /**
 217                  * Internal helper for #constructor and #newFromText.
 218                  *
 219                  * Based on Title.php#secureAndSplit
 220                  *
 221                  * @private
 222                  * @static
 223                  * @method parse
 224                  * @param {string} title
 225                  * @param {number} [defaultNamespace=NS_MAIN]
 226                  * @return {Object|boolean}
 227                  */
 228                 parse = function ( title, defaultNamespace ) {
 229                         var namespace, m, id, i, fragment, ext;
 230
 231                         namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
 232
 233                         title = title
 234                                 // Strip Unicode bidi override characters
 235                                 .replace( rUnicodeBidi, '' )
 236                                 // Normalise whitespace to underscores and remove duplicates
 237                                 .replace( rWhitespace, '_' )
 238                                 // Trim underscores
 239                                 .replace( rUnderscoreTrim, '' );
 240
 241                         // Process initial colon
 242                         if ( title !== '' && title[ 0 ] === ':' ) {
 243                                 // Initial colon means main namespace instead of specified default
 244                                 namespace = NS_MAIN;
 245                                 title = title
 246                                         // Strip colon
 247                                         .slice( 1 )
 248                                         // Trim underscores
 249                                         .replace( rUnderscoreTrim, '' );
 250                         }
 251
 252                         if ( title === '' ) {
 253                                 return false;
 254                         }
 255
 256                         // Process namespace prefix (if any)
 257                         m = title.match( rSplit );
 258                         if ( m ) {
 259                                 id = getNsIdByName( m[ 1 ] );
 260                                 if ( id !== false ) {
 261                                         // Ordinary namespace
 262                                         namespace = id;
 263                                         title = m[ 2 ];
 264
 265                                         // For Talk:X pages, make sure X has no "namespace" prefix
 266                                         if ( namespace === NS_TALK && ( m = title.match( rSplit ) ) ) {
 267                                                 // Disallow titles like Talk:File:x (subject should roundtrip: talk:file:x -> file:x -> file_talk:x)
 268                                                 if ( getNsIdByName( m[ 1 ] ) !== false ) {
 269                                                         return false;
 270                                                 }
 271                                         }
 272                                 }
 273                         }
 274
 275                         // Process fragment
 276                         i = title.indexOf( '#' );
 277                         if ( i === -1 ) {
 278                                 fragment = null;
 279                         } else {
 280                                 fragment = title
 281                                         // Get segment starting after the hash
 282                                         .slice( i + 1 )
 283                                         // Convert to text
 284                                         // NB: Must not be trimmed ("Example#_foo" is not the same as "Example#foo")
 285                                         .replace( /_/g, ' ' );
 286
 287                                 title = title
 288                                         // Strip hash
 289                                         .slice( 0, i )
 290                                         // Trim underscores, again (strips "_" from "bar" in "Foo_bar_#quux")
 291                                         .replace( rUnderscoreTrim, '' );
 292                         }
 293
 294                         // Reject illegal characters
 295                         if ( title.match( rInvalid ) ) {
 296                                 return false;
 297                         }
 298
 299                         // Disallow titles that browsers or servers might resolve as directory navigation
 300                         if (
 301                                 title.indexOf( '.' ) !== -1 && (
 302                                         title === '.' || title === '..' ||
 303                                         title.indexOf( './' ) === 0 ||
 304                                         title.indexOf( '../' ) === 0 ||
 305                                         title.indexOf( '/./' ) !== -1 ||
 306                                         title.indexOf( '/../' ) !== -1 ||
 307                                         title.slice( -2 ) === '/.' ||
 308                                         title.slice( -3 ) === '/..'
 309                                 )
 310                         ) {
 311                                 return false;
 312                         }
 313
 314                         // Disallow magic tilde sequence
 315                         if ( title.indexOf( '~~~' ) !== -1 ) {
 316                                 return false;
 317                         }
 318
 319                         // Disallow titles exceeding the TITLE_MAX_BYTES byte size limit (size of underlying database field)
 320                         // Except for special pages, e.g. [[Special:Block/Long name]]
 321                         // Note: The PHP implementation also asserts that even in NS_SPECIAL, the title should
 322                         // be less than 512 bytes.
 323                         if ( namespace !== NS_SPECIAL && $.byteLength( title ) > TITLE_MAX_BYTES ) {
 324                                 return false;
 325                         }
 326
 327                         // Can't make a link to a namespace alone.
 328                         if ( title === '' && namespace !== NS_MAIN ) {
 329                                 return false;
 330                         }
 331
 332                         // Any remaining initial :s are illegal.
 333                         if ( title[ 0 ] === ':' ) {
 334                                 return false;
 335                         }
 336
 337                         // For backwards-compatibility with old mw.Title, we separate the extension from the
 338                         // rest of the title.
 339                         i = title.lastIndexOf( '.' );
 340                         if ( i === -1 || title.length <= i + 1 ) {
 341                                 // Extensions are the non-empty segment after the last dot
 342                                 ext = null;
 343                         } else {
 344                                 ext = title.slice( i + 1 );
 345                                 title = title.slice( 0, i );
 346                         }
 347
 348                         return {
 349                                 namespace: namespace,
 350                                 title: title,
 351                                 ext: ext,
 352                                 fragment: fragment
 353                         };
 354                 },
 355
 356                 /**
 357                  * Convert db-key to readable text.
 358                  *
 359                  * @private
 360                  * @static
 361                  * @method text
 362                  * @param {string} s
 363                  * @return {string}
 364                  */
 365                 text = function ( s ) {
 366                         if ( s !== null && s !== undefined ) {
 367                                 return s.replace( /_/g, ' ' );
 368                         } else {
 369                                 return '';
 370                         }
 371                 },
 372
 373                 /**
 374                  * Sanitizes a string based on a rule set and a filter
 375                  *
 376                  * @private
 377                  * @static
 378                  * @method sanitize
 379                  * @param {string} s
 380                  * @param {Array} filter
 381                  * @return {string}
 382                  */
 383                 sanitize = function ( s, filter ) {
 384                         var i, ruleLength, rule, m, filterLength,
 385                                 rules = sanitationRules;
 386
 387                         for ( i = 0, ruleLength = rules.length; i < ruleLength; ++i ) {
 388                                 rule = rules[ i ];
 389                                 for ( m = 0, filterLength = filter.length; m < filterLength; ++m ) {
 390                                         if ( rule[ filter[ m ] ] ) {
 391                                                 s = s.replace( rule.pattern, rule.replace );
 392                                         }
 393                                 }
 394                         }
 395                         return s;
 396                 },
 397
 398                 /**
 399                  * Cuts a string to a specific byte length, assuming UTF-8
 400                  * or less, if the last character is a multi-byte one
 401                  *
 402                  * @private
 403                  * @static
 404                  * @method trimToByteLength
 405                  * @param {string} s
 406                  * @param {number} length
 407                  * @return {string}
 408                  */
 409                 trimToByteLength = function ( s, length ) {
 410                         var byteLength, chopOffChars, chopOffBytes;
 411
 412                         // bytelength is always greater or equal to the length in characters
 413                         s = s.substr( 0, length );
 414                         while ( ( byteLength = $.byteLength( s ) ) > length ) {
 415                                 // Calculate how many characters can be safely removed
 416                                 // First, we need to know how many bytes the string exceeds the threshold
 417                                 chopOffBytes = byteLength - length;
 418                                 // A character in UTF-8 is at most 4 bytes
 419                                 // One character must be removed in any case because the
 420                                 // string is too long
 421                                 chopOffChars = Math.max( 1, Math.floor( chopOffBytes / 4 ) );
 422                                 s = s.substr( 0, s.length - chopOffChars );
 423                         }
 424                         return s;
 425                 },
 426
 427                 /**
 428                  * Cuts a file name to a specific byte length
 429                  *
 430                  * @private
 431                  * @static
 432                  * @method trimFileNameToByteLength
 433                  * @param {string} name without extension
 434                  * @param {string} extension file extension
 435                  * @return {string} The full name, including extension
 436                  */
 437                 trimFileNameToByteLength = function ( name, extension ) {
 438                         // There is a special byte limit for file names and ... remember the dot
 439                         return trimToByteLength( name, FILENAME_MAX_BYTES - extension.length - 1 ) + '.' + extension;
 440                 };
 441
 442         /**
 443          * @method constructor
 444          * @param {string} title Title of the page. If no second argument given,
 445          *  this will be searched for a namespace
 446          * @param {number} [namespace=NS_MAIN] If given, will used as default namespace for the given title
 447          * @throws {Error} When the title is invalid
 448          */
 449         function Title( title, namespace ) {
 450                 var parsed = parse( title, namespace );
 451                 if ( !parsed ) {
 452                         throw new Error( 'Unable to parse title' );
 453                 }
 454
 455                 this.namespace = parsed.namespace;
 456                 this.title = parsed.title;
 457                 this.ext = parsed.ext;
 458                 this.fragment = parsed.fragment;
 459         }
 460
 461         /* Static members */
 462
 463         /**
 464          * Constructor for Title objects with a null return instead of an exception for invalid titles.
 465          *
 466          * Note that `namespace` is the **default** namespace only, and can be overridden by a namespace
 467          * prefix in `title`. If you do not want this behavior, use #makeTitle. See #constructor for
 468          * details.
 469          *
 470          * @static
 471          * @param {string} title
 472          * @param {number} [namespace=NS_MAIN] Default namespace
 473          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 474          */
 475         Title.newFromText = function ( title, namespace ) {
 476                 var t, parsed = parse( title, namespace );
 477                 if ( !parsed ) {
 478                         return null;
 479                 }
 480
 481                 t = Object.create( Title.prototype );
 482                 t.namespace = parsed.namespace;
 483                 t.title = parsed.title;
 484                 t.ext = parsed.ext;
 485                 t.fragment = parsed.fragment;
 486
 487                 return t;
 488         };
 489
 490         /**
 491          * Constructor for Title objects with predefined namespace.
 492          *
 493          * Unlike #newFromText or #constructor, this function doesn't allow the given `namespace` to be
 494          * overridden by a namespace prefix in `title`. See #constructor for details about this behavior.
 495          *
 496          * The single exception to this is when `namespace` is 0, indicating the main namespace. The
 497          * function behaves like #newFromText in that case.
 498          *
 499          * @static
 500          * @param {number} namespace Namespace to use for the title
 501          * @param {string} title
 502          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 503          */
 504         Title.makeTitle = function ( namespace, title ) {
 505                 return mw.Title.newFromText( getNamespacePrefix( namespace ) + title );
 506         };
 507
 508         /**
 509          * Constructor for Title objects from user input altering that input to
 510          * produce a title that MediaWiki will accept as legal
 511          *
 512          * @static
 513          * @param {string} title
 514          * @param {number} [defaultNamespace=NS_MAIN]
 515          *  If given, will used as default namespace for the given title.
 516          * @param {Object} [options] additional options
 517          * @param {boolean} [options.forUploading=true]
 518          *  Makes sure that a file is uploadable under the title returned.
 519          *  There are pages in the file namespace under which file upload is impossible.
 520          *  Automatically assumed if the title is created in the Media namespace.
 521          * @return {mw.Title|null} A valid Title object or null if the input cannot be turned into a valid title
 522          */
 523         Title.newFromUserInput = function ( title, defaultNamespace, options ) {
 524                 var namespace, m, id, ext, parts;
 525
 526                 // defaultNamespace is optional; check whether options moves up
 527                 if ( arguments.length < 3 && $.type( defaultNamespace ) === 'object' ) {
 528                         options = defaultNamespace;
 529                         defaultNamespace = undefined;
 530                 }
 531
 532                 // merge options into defaults
 533                 options = $.extend( {
 534                         forUploading: true
 535                 }, options );
 536
 537                 namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
 538
 539                 // Normalise additional whitespace
 540                 title = title.replace( /\s/g, ' ' ).trim();
 541
 542                 // Process initial colon
 543                 if ( title !== '' && title[ 0 ] === ':' ) {
 544                         // Initial colon means main namespace instead of specified default
 545                         namespace = NS_MAIN;
 546                         title = title
 547                                 // Strip colon
 548                                 .substr( 1 )
 549                                 // Trim underscores
 550                                 .replace( rUnderscoreTrim, '' );
 551                 }
 552
 553                 // Process namespace prefix (if any)
 554                 m = title.match( rSplit );
 555                 if ( m ) {
 556                         id = getNsIdByName( m[ 1 ] );
 557                         if ( id !== false ) {
 558                                 // Ordinary namespace
 559                                 namespace = id;
 560                                 title = m[ 2 ];
 561                         }
 562                 }
 563
 564                 if (
 565                         namespace === NS_MEDIA ||
 566                         ( options.forUploading && ( namespace === NS_FILE ) )
 567                 ) {
 568
 569                         title = sanitize( title, [ 'generalRule', 'fileRule' ] );
 570
 571                         // Operate on the file extension
 572                         // Although it is possible having spaces between the name and the ".ext" this isn't nice for
 573                         // operating systems hiding file extensions -> strip them later on
 574                         parts = title.split( '.' );
 575
 576                         if ( parts.length > 1 ) {
 577
 578                                 // Get the last part, which is supposed to be the file extension
 579                                 ext = parts.pop();
 580
 581                                 // Remove whitespace of the name part (that W/O extension)
 582                                 title = parts.join( '.' ).trim();
 583
 584                                 // Cut, if too long and append file extension
 585                                 title = trimFileNameToByteLength( title, ext );
 586
 587                         } else {
 588
 589                                 // Missing file extension
 590                                 title = parts.join( '.' ).trim();
 591
 592                                 // Name has no file extension and a fallback wasn't provided either
 593                                 return null;
 594                         }
 595                 } else {
 596
 597                         title = sanitize( title, [ 'generalRule' ] );
 598
 599                         // Cut titles exceeding the TITLE_MAX_BYTES byte size limit
 600                         // (size of underlying database field)
 601                         if ( namespace !== NS_SPECIAL ) {
 602                                 title = trimToByteLength( title, TITLE_MAX_BYTES );
 603                         }
 604                 }
 605
 606                 // Any remaining initial :s are illegal.
 607                 title = title.replace( /^:+/, '' );
 608
 609                 return Title.newFromText( title, namespace );
 610         };
 611
 612         /**
 613          * Sanitizes a file name as supplied by the user, originating in the user's file system
 614          * so it is most likely a valid MediaWiki title and file name after processing.
 615          * Returns null on fatal errors.
 616          *
 617          * @static
 618          * @param {string} uncleanName The unclean file name including file extension but
 619          *   without namespace
 620          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 621          */
 622         Title.newFromFileName = function ( uncleanName ) {
 623
 624                 return Title.newFromUserInput( 'File:' + uncleanName, {
 625                         forUploading: true
 626                 } );
 627         };
 628
 629         /**
 630          * Get the file title from an image element
 631          *
 632          *     var title = mw.Title.newFromImg( $( 'img:first' ) );
 633          *
 634          * @static
 635          * @param {HTMLElement|jQuery} img The image to use as a base
 636          * @return {mw.Title|null} The file title or null if unsuccessful
 637          */
 638         Title.newFromImg = function ( img ) {
 639                 var matches, i, regex, src, decodedSrc,
 640
 641                         // thumb.php-generated thumbnails
 642                         thumbPhpRegex = /thumb\.php/,
 643                         regexes = [
 644                                 // Thumbnails
 645                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)\/[^\s/]+-[^\s/]*$/,
 646
 647                                 // Full size images
 648                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)$/,
 649
 650                                 // Thumbnails in non-hashed upload directories
 651                                 /\/([^\s/]+)\/[^\s/]+-(?:\1|thumbnail)[^\s/]*$/,
 652
 653                                 // Full-size images in non-hashed upload directories
 654                                 /\/([^\s/]+)$/
 655                         ],
 656
 657                         recount = regexes.length;
 658
 659                 src = img.jquery ? img[ 0 ].src : img.src;
 660
 661                 matches = src.match( thumbPhpRegex );
 662
 663                 if ( matches ) {
 664                         return mw.Title.newFromText( 'File:' + mw.util.getParamValue( 'f', src ) );
 665                 }
 666
 667                 decodedSrc = decodeURIComponent( src );
 668
 669                 for ( i = 0; i < recount; i++ ) {
 670                         regex = regexes[ i ];
 671                         matches = decodedSrc.match( regex );
 672
 673                         if ( matches && matches[ 1 ] ) {
 674                                 return mw.Title.newFromText( 'File:' + matches[ 1 ] );
 675                         }
 676                 }
 677
 678                 return null;
 679         };
 680
 681         /**
 682          * Whether this title exists on the wiki.
 683          *
 684          * @static
 685          * @param {string|mw.Title} title prefixed db-key name (string) or instance of Title
 686          * @return {boolean|null} Boolean if the information is available, otherwise null
 687          */
 688         Title.exists = function ( title ) {
 689                 var match,
 690                         obj = Title.exist.pages;
 691
 692                 if ( typeof title === 'string' ) {
 693                         match = obj[ title ];
 694                 } else if ( title instanceof Title ) {
 695                         match = obj[ title.toString() ];
 696                 } else {
 697                         throw new Error( 'mw.Title.exists: title must be a string or an instance of Title' );
 698                 }
 699
 700                 if ( typeof match !== 'boolean' ) {
 701                         return null;
 702                 }
 703
 704                 return match;
 705         };
 706
 707         /**
 708          * Store page existence
 709          *
 710          * @static
 711          * @property {Object} exist
 712          * @property {Object} exist.pages Keyed by title. Boolean true value indicates page does exist.
 713          *
 714          * @property {Function} exist.set The setter function.
 715          *
 716          *  Example to declare existing titles:
 717          *
 718          *     Title.exist.set( ['User:John_Doe', ...] );
 719          *
 720          *  Example to declare titles nonexistent:
 721          *
 722          *     Title.exist.set( ['File:Foo_bar.jpg', ...], false );
 723          *
 724          * @property {string|Array} exist.set.titles Title(s) in strict prefixedDb title form
 725          * @property {boolean} [exist.set.state=true] State of the given titles
 726          * @return {boolean}
 727          */
 728         Title.exist = {
 729                 pages: {},
 730
 731                 set: function ( titles, state ) {
 732                         var i, len,
 733                                 pages = this.pages;
 734
 735                         titles = Array.isArray( titles ) ? titles : [ titles ];
 736                         state = state === undefined ? true : !!state;
 737
 738                         for ( i = 0, len = titles.length; i < len; i++ ) {
 739                                 pages[ titles[ i ] ] = state;
 740                         }
 741                         return true;
 742                 }
 743         };
 744
 745         /**
 746          * Normalize a file extension to the common form, making it lowercase and checking some synonyms,
 747          * and ensure it's clean. Extensions with non-alphanumeric characters will be discarded.
 748          * Keep in sync with File::normalizeExtension() in PHP.
 749          *
 750          * @param {string} extension File extension (without the leading dot)
 751          * @return {string} File extension in canonical form
 752          */
 753         Title.normalizeExtension = function ( extension ) {
 754                 var
 755                         lower = extension.toLowerCase(),
 756                         squish = {
 757                                 htm: 'html',
 758                                 jpeg: 'jpg',
 759                                 mpeg: 'mpg',
 760                                 tiff: 'tif',
 761                                 ogv: 'ogg'
 762                         };
 763                 if ( squish.hasOwnProperty( lower ) ) {
 764                         return squish[ lower ];
 765                 } else if ( /^[0-9a-z]+$/.test( lower ) ) {
 766                         return lower;
 767                 } else {
 768                         return '';
 769                 }
 770         };
 771
 772         /* Public members */
 773
 774         Title.prototype = {
 775                 constructor: Title,
 776
 777                 /**
 778                  * Get the namespace number
 779                  *
 780                  * Example: 6 for "File:Example_image.svg".
 781                  *
 782                  * @return {number}
 783                  */
 784                 getNamespaceId: function () {
 785                         return this.namespace;
 786                 },
 787
 788                 /**
 789                  * Get the namespace prefix (in the content language)
 790                  *
 791                  * Example: "File:" for "File:Example_image.svg".
 792                  * In #NS_MAIN this is '', otherwise namespace name plus ':'
 793                  *
 794                  * @return {string}
 795                  */
 796                 getNamespacePrefix: function () {
 797                         return getNamespacePrefix( this.namespace );
 798                 },
 799
 800                 /**
 801                  * Get the page name without extension or namespace prefix
 802                  *
 803                  * Example: "Example_image" for "File:Example_image.svg".
 804                  *
 805                  * For the page title (full page name without namespace prefix), see #getMain.
 806                  *
 807                  * @return {string}
 808                  */
 809                 getName: function () {
 810                         if (
 811                                 $.inArray( this.namespace, mw.config.get( 'wgCaseSensitiveNamespaces' ) ) !== -1 ||
 812                                 !this.title.length
 813                         ) {
 814                                 return this.title;
 815                         }
 816                         // PHP's strtoupper differs from String.toUpperCase in a number of cases
 817                         // Bug: T147646
 818                         return mw.Title.phpCharToUpper( this.title[ 0 ] ) + this.title.slice( 1 );
 819                 },
 820
 821                 /**
 822                  * Get the page name (transformed by #text)
 823                  *
 824                  * Example: "Example image" for "File:Example_image.svg".
 825                  *
 826                  * For the page title (full page name without namespace prefix), see #getMainText.
 827                  *
 828                  * @return {string}
 829                  */
 830                 getNameText: function () {
 831                         return text( this.getName() );
 832                 },
 833
 834                 /**
 835                  * Get the extension of the page name (if any)
 836                  *
 837                  * @return {string|null} Name extension or null if there is none
 838                  */
 839                 getExtension: function () {
 840                         return this.ext;
 841                 },
 842
 843                 /**
 844                  * Shortcut for appendable string to form the main page name.
 845                  *
 846                  * Returns a string like ".json", or "" if no extension.
 847                  *
 848                  * @return {string}
 849                  */
 850                 getDotExtension: function () {
 851                         return this.ext === null ? '' : '.' + this.ext;
 852                 },
 853
 854                 /**
 855                  * Get the main page name
 856                  *
 857                  * Example: "Example_image.svg" for "File:Example_image.svg".
 858                  *
 859                  * @return {string}
 860                  */
 861                 getMain: function () {
 862                         return this.getName() + this.getDotExtension();
 863                 },
 864
 865                 /**
 866                  * Get the main page name (transformed by #text)
 867                  *
 868                  * Example: "Example image.svg" for "File:Example_image.svg".
 869                  *
 870                  * @return {string}
 871                  */
 872                 getMainText: function () {
 873                         return text( this.getMain() );
 874                 },
 875
 876                 /**
 877                  * Get the full page name
 878                  *
 879                  * Example: "File:Example_image.svg".
 880                  * Most useful for API calls, anything that must identify the "title".
 881                  *
 882                  * @return {string}
 883                  */
 884                 getPrefixedDb: function () {
 885                         return this.getNamespacePrefix() + this.getMain();
 886                 },
 887
 888                 /**
 889                  * Get the full page name (transformed by #text)
 890                  *
 891                  * Example: "File:Example image.svg" for "File:Example_image.svg".
 892                  *
 893                  * @return {string}
 894                  */
 895                 getPrefixedText: function () {
 896                         return text( this.getPrefixedDb() );
 897                 },
 898
 899                 /**
 900                  * Get the page name relative to a namespace
 901                  *
 902                  * Example:
 903                  *
 904                  * - "Foo:Bar" relative to the Foo namespace becomes "Bar".
 905                  * - "Bar" relative to any non-main namespace becomes ":Bar".
 906                  * - "Foo:Bar" relative to any namespace other than Foo stays "Foo:Bar".
 907                  *
 908                  * @param {number} namespace The namespace to be relative to
 909                  * @return {string}
 910                  */
 911                 getRelativeText: function ( namespace ) {
 912                         if ( this.getNamespaceId() === namespace ) {
 913                                 return this.getMainText();
 914                         } else if ( this.getNamespaceId() === NS_MAIN ) {
 915                                 return ':' + this.getPrefixedText();
 916                         } else {
 917                                 return this.getPrefixedText();
 918                         }
 919                 },
 920
 921                 /**
 922                  * Get the fragment (if any).
 923                  *
 924                  * Note that this method (by design) does not include the hash character and
 925                  * the value is not url encoded.
 926                  *
 927                  * @return {string|null}
 928                  */
 929                 getFragment: function () {
 930                         return this.fragment;
 931                 },
 932
 933                 /**
 934                  * Get the URL to this title
 935                  *
 936                  * @see mw.util#getUrl
 937                  * @param {Object} [params] A mapping of query parameter names to values,
 938                  *     e.g. `{ action: 'edit' }`.
 939                  * @return {string}
 940                  */
 941                 getUrl: function ( params ) {
 942                         var fragment = this.getFragment();
 943                         if ( fragment ) {
 944                                 return mw.util.getUrl( this.toString() + '#' + fragment, params );
 945                         } else {
 946                                 return mw.util.getUrl( this.toString(), params );
 947                         }
 948                 },
 949
 950                 /**
 951                  * Whether this title exists on the wiki.
 952                  *
 953                  * @see #static-method-exists
 954                  * @return {boolean|null} Boolean if the information is available, otherwise null
 955                  */
 956                 exists: function () {
 957                         return Title.exists( this );
 958                 }
 959         };
 960
 961         /**
 962          * @alias #getPrefixedDb
 963          * @method
 964          */
 965         Title.prototype.toString = Title.prototype.getPrefixedDb;
 966
 967         /**
 968          * @alias #getPrefixedText
 969          * @method
 970          */
 971         Title.prototype.toText = Title.prototype.getPrefixedText;
 972
 973         // Expose
 974         mw.Title = Title;
 975
 976 }( mediaWiki, jQuery ) );