resources/src/mediawiki/mediawiki.Title.js

   1 /*!
   2  * @author Neil Kandalgaonkar, 2010
   3  * @author Timo Tijhof, 2011-2013
   4  * @since 1.18
   5  */
   6
   7 /* eslint-disable no-use-before-define */
   8
   9 ( function ( mw, $ ) {
  10         /**
  11          * Parse titles into an object structure. Note that when using the constructor
  12          * directly, passing invalid titles will result in an exception. Use #newFromText to use the
  13          * logic directly and get null for invalid titles which is easier to work with.
  14          *
  15          * Note that in the constructor and #newFromText method, `namespace` is the **default** namespace
  16          * only, and can be overridden by a namespace prefix in `title`. If you do not want this behavior,
  17          * use #makeTitle. Compare:
  18          *
  19          *     new mw.Title( 'Foo', NS_TEMPLATE ).getPrefixedText();                  // => 'Template:Foo'
  20          *     mw.Title.newFromText( 'Foo', NS_TEMPLATE ).getPrefixedText();          // => 'Template:Foo'
  21          *     mw.Title.makeTitle( NS_TEMPLATE, 'Foo' ).getPrefixedText();            // => 'Template:Foo'
  22          *
  23          *     new mw.Title( 'Category:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Category:Foo'
  24          *     mw.Title.newFromText( 'Category:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Category:Foo'
  25          *     mw.Title.makeTitle( NS_TEMPLATE, 'Category:Foo' ).getPrefixedText();   // => 'Template:Category:Foo'
  26          *
  27          *     new mw.Title( 'Template:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Template:Foo'
  28          *     mw.Title.newFromText( 'Template:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Template:Foo'
  29          *     mw.Title.makeTitle( NS_TEMPLATE, 'Template:Foo' ).getPrefixedText();   // => 'Template:Template:Foo'
  30          *
  31          * @class mw.Title
  32          * @constructor
  33          * @param {string} title Title of the page. If no second argument given,
  34          *  this will be searched for a namespace
  35          * @param {number} [namespace=NS_MAIN] If given, will used as default namespace for the given title
  36          * @throws {Error} When the title is invalid
  37          */
  38         function Title( title, namespace ) {
  39                 var parsed = parse( title, namespace );
  40                 if ( !parsed ) {
  41                         throw new Error( 'Unable to parse title' );
  42                 }
  43
  44                 this.namespace = parsed.namespace;
  45                 this.title = parsed.title;
  46                 this.ext = parsed.ext;
  47                 this.fragment = parsed.fragment;
  48         }
  49
  50         /* Private members */
  51
  52         // eslint-disable-next-line vars-on-top
  53         var
  54                 namespaceIds = mw.config.get( 'wgNamespaceIds' ),
  55
  56                 /**
  57                  * @private
  58                  * @static
  59                  * @property NS_MAIN
  60                  */
  61                 NS_MAIN = namespaceIds[ '' ],
  62
  63                 /**
  64                  * @private
  65                  * @static
  66                  * @property NS_TALK
  67                  */
  68                 NS_TALK = namespaceIds.talk,
  69
  70                 /**
  71                  * @private
  72                  * @static
  73                  * @property NS_SPECIAL
  74                  */
  75                 NS_SPECIAL = namespaceIds.special,
  76
  77                 /**
  78                  * @private
  79                  * @static
  80                  * @property NS_MEDIA
  81                  */
  82                 NS_MEDIA = namespaceIds.media,
  83
  84                 /**
  85                  * @private
  86                  * @static
  87                  * @property NS_FILE
  88                  */
  89                 NS_FILE = namespaceIds.file,
  90
  91                 /**
  92                  * @private
  93                  * @static
  94                  * @property FILENAME_MAX_BYTES
  95                  */
  96                 FILENAME_MAX_BYTES = 240,
  97
  98                 /**
  99                  * @private
 100                  * @static
 101                  * @property TITLE_MAX_BYTES
 102                  */
 103                 TITLE_MAX_BYTES = 255,
 104
 105                 /**
 106                  * Get the namespace id from a namespace name (either from the localized, canonical or alias
 107                  * name).
 108                  *
 109                  * Example: On a German wiki this would return 6 for any of 'File', 'Datei', 'Image' or
 110                  * even 'Bild'.
 111                  *
 112                  * @private
 113                  * @static
 114                  * @method getNsIdByName
 115                  * @param {string} ns Namespace name (case insensitive, leading/trailing space ignored)
 116                  * @return {number|boolean} Namespace id or boolean false
 117                  */
 118                 getNsIdByName = function ( ns ) {
 119                         var id;
 120
 121                         // Don't cast non-strings to strings, because null or undefined should not result in
 122                         // returning the id of a potential namespace called "Null:" (e.g. on null.example.org/wiki)
 123                         // Also, toLowerCase throws exception on null/undefined, because it is a String method.
 124                         if ( typeof ns !== 'string' ) {
 125                                 return false;
 126                         }
 127                         // TODO: Should just use local var namespaceIds here but it
 128                         // breaks test which modify the config
 129                         id = mw.config.get( 'wgNamespaceIds' )[ ns.toLowerCase() ];
 130                         if ( id === undefined ) {
 131                                 return false;
 132                         }
 133                         return id;
 134                 },
 135
 136                 /**
 137                  * @private
 138                  * @method getNamespacePrefix_
 139                  * @param {number} namespace
 140                  * @return {string}
 141                  */
 142                 getNamespacePrefix = function ( namespace ) {
 143                         return namespace === NS_MAIN ?
 144                                 '' :
 145                                 ( mw.config.get( 'wgFormattedNamespaces' )[ namespace ].replace( / /g, '_' ) + ':' );
 146                 },
 147
 148                 rUnderscoreTrim = /^_+|_+$/g,
 149
 150                 rSplit = /^(.+?)_*:_*(.*)$/,
 151
 152                 // See MediaWikiTitleCodec.php#getTitleInvalidRegex
 153                 rInvalid = new RegExp(
 154                         '[^' + mw.config.get( 'wgLegalTitleChars' ) + ']' +
 155                         // URL percent encoding sequences interfere with the ability
 156                         // to round-trip titles -- you can't link to them consistently.
 157                         '|%[0-9A-Fa-f]{2}' +
 158                         // XML/HTML character references produce similar issues.
 159                         '|&[A-Za-z0-9\u0080-\uFFFF]+;' +
 160                         '|&#[0-9]+;' +
 161                         '|&#x[0-9A-Fa-f]+;'
 162                 ),
 163
 164                 // From MediaWikiTitleCodec::splitTitleString() in PHP
 165                 // Note that this is not equivalent to /\s/, e.g. underscore is included, tab is not included.
 166                 rWhitespace = /[ _\u00A0\u1680\u180E\u2000-\u200A\u2028\u2029\u202F\u205F\u3000]+/g,
 167
 168                 // From MediaWikiTitleCodec::splitTitleString() in PHP
 169                 rUnicodeBidi = /[\u200E\u200F\u202A-\u202E]/g,
 170
 171                 /**
 172                  * Slightly modified from Flinfo. Credit goes to Lupo and Flominator.
 173                  * @private
 174                  * @static
 175                  * @property sanitationRules
 176                  */
 177                 sanitationRules = [
 178                         // "signature"
 179                         {
 180                                 pattern: /~{3}/g,
 181                                 replace: '',
 182                                 generalRule: true
 183                         },
 184                         // control characters
 185                         {
 186                                 // eslint-disable-next-line no-control-regex
 187                                 pattern: /[\x00-\x1f\x7f]/g,
 188                                 replace: '',
 189                                 generalRule: true
 190                         },
 191                         // URL encoding (possibly)
 192                         {
 193                                 pattern: /%([0-9A-Fa-f]{2})/g,
 194                                 replace: '% $1',
 195                                 generalRule: true
 196                         },
 197                         // HTML-character-entities
 198                         {
 199                                 pattern: /&(([A-Za-z0-9\x80-\xff]+|#[0-9]+|#x[0-9A-Fa-f]+);)/g,
 200                                 replace: '& $1',
 201                                 generalRule: true
 202                         },
 203                         // slash, colon (not supported by file systems like NTFS/Windows, Mac OS 9 [:], ext4 [/])
 204                         {
 205                                 pattern: new RegExp( '[' + mw.config.get( 'wgIllegalFileChars', '' ) + ']', 'g' ),
 206                                 replace: '-',
 207                                 fileRule: true
 208                         },
 209                         // brackets, greater than
 210                         {
 211                                 pattern: /[}\]>]/g,
 212                                 replace: ')',
 213                                 generalRule: true
 214                         },
 215                         // brackets, lower than
 216                         {
 217                                 pattern: /[{[<]/g,
 218                                 replace: '(',
 219                                 generalRule: true
 220                         },
 221                         // everything that wasn't covered yet
 222                         {
 223                                 pattern: new RegExp( rInvalid.source, 'g' ),
 224                                 replace: '-',
 225                                 generalRule: true
 226                         },
 227                         // directory structures
 228                         {
 229                                 pattern: /^(\.|\.\.|\.\/.*|\.\.\/.*|.*\/\.\/.*|.*\/\.\.\/.*|.*\/\.|.*\/\.\.)$/g,
 230                                 replace: '',
 231                                 generalRule: true
 232                         }
 233                 ],
 234
 235                 /**
 236                  * Internal helper for #constructor and #newFromText.
 237                  *
 238                  * Based on Title.php#secureAndSplit
 239                  *
 240                  * @private
 241                  * @static
 242                  * @method parse
 243                  * @param {string} title
 244                  * @param {number} [defaultNamespace=NS_MAIN]
 245                  * @return {Object|boolean}
 246                  */
 247                 parse = function ( title, defaultNamespace ) {
 248                         var namespace, m, id, i, fragment, ext;
 249
 250                         namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
 251
 252                         title = title
 253                                 // Strip Unicode bidi override characters
 254                                 .replace( rUnicodeBidi, '' )
 255                                 // Normalise whitespace to underscores and remove duplicates
 256                                 .replace( rWhitespace, '_' )
 257                                 // Trim underscores
 258                                 .replace( rUnderscoreTrim, '' );
 259
 260                         // Process initial colon
 261                         if ( title !== '' && title[ 0 ] === ':' ) {
 262                                 // Initial colon means main namespace instead of specified default
 263                                 namespace = NS_MAIN;
 264                                 title = title
 265                                         // Strip colon
 266                                         .slice( 1 )
 267                                         // Trim underscores
 268                                         .replace( rUnderscoreTrim, '' );
 269                         }
 270
 271                         if ( title === '' ) {
 272                                 return false;
 273                         }
 274
 275                         // Process namespace prefix (if any)
 276                         m = title.match( rSplit );
 277                         if ( m ) {
 278                                 id = getNsIdByName( m[ 1 ] );
 279                                 if ( id !== false ) {
 280                                         // Ordinary namespace
 281                                         namespace = id;
 282                                         title = m[ 2 ];
 283
 284                                         // For Talk:X pages, make sure X has no "namespace" prefix
 285                                         if ( namespace === NS_TALK && ( m = title.match( rSplit ) ) ) {
 286                                                 // Disallow titles like Talk:File:x (subject should roundtrip: talk:file:x -> file:x -> file_talk:x)
 287                                                 if ( getNsIdByName( m[ 1 ] ) !== false ) {
 288                                                         return false;
 289                                                 }
 290                                         }
 291                                 }
 292                         }
 293
 294                         // Process fragment
 295                         i = title.indexOf( '#' );
 296                         if ( i === -1 ) {
 297                                 fragment = null;
 298                         } else {
 299                                 fragment = title
 300                                         // Get segment starting after the hash
 301                                         .slice( i + 1 )
 302                                         // Convert to text
 303                                         // NB: Must not be trimmed ("Example#_foo" is not the same as "Example#foo")
 304                                         .replace( /_/g, ' ' );
 305
 306                                 title = title
 307                                         // Strip hash
 308                                         .slice( 0, i )
 309                                         // Trim underscores, again (strips "_" from "bar" in "Foo_bar_#quux")
 310                                         .replace( rUnderscoreTrim, '' );
 311                         }
 312
 313                         // Reject illegal characters
 314                         if ( title.match( rInvalid ) ) {
 315                                 return false;
 316                         }
 317
 318                         // Disallow titles that browsers or servers might resolve as directory navigation
 319                         if (
 320                                 title.indexOf( '.' ) !== -1 && (
 321                                         title === '.' || title === '..' ||
 322                                         title.indexOf( './' ) === 0 ||
 323                                         title.indexOf( '../' ) === 0 ||
 324                                         title.indexOf( '/./' ) !== -1 ||
 325                                         title.indexOf( '/../' ) !== -1 ||
 326                                         title.slice( -2 ) === '/.' ||
 327                                         title.slice( -3 ) === '/..'
 328                                 )
 329                         ) {
 330                                 return false;
 331                         }
 332
 333                         // Disallow magic tilde sequence
 334                         if ( title.indexOf( '~~~' ) !== -1 ) {
 335                                 return false;
 336                         }
 337
 338                         // Disallow titles exceeding the TITLE_MAX_BYTES byte size limit (size of underlying database field)
 339                         // Except for special pages, e.g. [[Special:Block/Long name]]
 340                         // Note: The PHP implementation also asserts that even in NS_SPECIAL, the title should
 341                         // be less than 512 bytes.
 342                         if ( namespace !== NS_SPECIAL && $.byteLength( title ) > TITLE_MAX_BYTES ) {
 343                                 return false;
 344                         }
 345
 346                         // Can't make a link to a namespace alone.
 347                         if ( title === '' && namespace !== NS_MAIN ) {
 348                                 return false;
 349                         }
 350
 351                         // Any remaining initial :s are illegal.
 352                         if ( title[ 0 ] === ':' ) {
 353                                 return false;
 354                         }
 355
 356                         // For backwards-compatibility with old mw.Title, we separate the extension from the
 357                         // rest of the title.
 358                         i = title.lastIndexOf( '.' );
 359                         if ( i === -1 || title.length <= i + 1 ) {
 360                                 // Extensions are the non-empty segment after the last dot
 361                                 ext = null;
 362                         } else {
 363                                 ext = title.slice( i + 1 );
 364                                 title = title.slice( 0, i );
 365                         }
 366
 367                         return {
 368                                 namespace: namespace,
 369                                 title: title,
 370                                 ext: ext,
 371                                 fragment: fragment
 372                         };
 373                 },
 374
 375                 /**
 376                  * Convert db-key to readable text.
 377                  *
 378                  * @private
 379                  * @static
 380                  * @method text
 381                  * @param {string} s
 382                  * @return {string}
 383                  */
 384                 text = function ( s ) {
 385                         if ( s !== null && s !== undefined ) {
 386                                 return s.replace( /_/g, ' ' );
 387                         } else {
 388                                 return '';
 389                         }
 390                 },
 391
 392                 /**
 393                  * Sanitizes a string based on a rule set and a filter
 394                  *
 395                  * @private
 396                  * @static
 397                  * @method sanitize
 398                  * @param {string} s
 399                  * @param {Array} filter
 400                  * @return {string}
 401                  */
 402                 sanitize = function ( s, filter ) {
 403                         var i, ruleLength, rule, m, filterLength,
 404                                 rules = sanitationRules;
 405
 406                         for ( i = 0, ruleLength = rules.length; i < ruleLength; ++i ) {
 407                                 rule = rules[ i ];
 408                                 for ( m = 0, filterLength = filter.length; m < filterLength; ++m ) {
 409                                         if ( rule[ filter[ m ] ] ) {
 410                                                 s = s.replace( rule.pattern, rule.replace );
 411                                         }
 412                                 }
 413                         }
 414                         return s;
 415                 },
 416
 417                 /**
 418                  * Cuts a string to a specific byte length, assuming UTF-8
 419                  * or less, if the last character is a multi-byte one
 420                  *
 421                  * @private
 422                  * @static
 423                  * @method trimToByteLength
 424                  * @param {string} s
 425                  * @param {number} length
 426                  * @return {string}
 427                  */
 428                 trimToByteLength = function ( s, length ) {
 429                         var byteLength, chopOffChars, chopOffBytes;
 430
 431                         // bytelength is always greater or equal to the length in characters
 432                         s = s.substr( 0, length );
 433                         while ( ( byteLength = $.byteLength( s ) ) > length ) {
 434                                 // Calculate how many characters can be safely removed
 435                                 // First, we need to know how many bytes the string exceeds the threshold
 436                                 chopOffBytes = byteLength - length;
 437                                 // A character in UTF-8 is at most 4 bytes
 438                                 // One character must be removed in any case because the
 439                                 // string is too long
 440                                 chopOffChars = Math.max( 1, Math.floor( chopOffBytes / 4 ) );
 441                                 s = s.substr( 0, s.length - chopOffChars );
 442                         }
 443                         return s;
 444                 },
 445
 446                 /**
 447                  * Cuts a file name to a specific byte length
 448                  *
 449                  * @private
 450                  * @static
 451                  * @method trimFileNameToByteLength
 452                  * @param {string} name without extension
 453                  * @param {string} extension file extension
 454                  * @return {string} The full name, including extension
 455                  */
 456                 trimFileNameToByteLength = function ( name, extension ) {
 457                         // There is a special byte limit for file names and ... remember the dot
 458                         return trimToByteLength( name, FILENAME_MAX_BYTES - extension.length - 1 ) + '.' + extension;
 459                 },
 460
 461                 // Polyfill for ES5 Object.create
 462                 createObject = Object.create || ( function () {
 463                         return function ( o ) {
 464                                 function Title() {}
 465                                 if ( o !== Object( o ) ) {
 466                                         throw new Error( 'Cannot inherit from a non-object' );
 467                                 }
 468                                 Title.prototype = o;
 469                                 return new Title();
 470                         };
 471                 }() );
 472
 473         /* Static members */
 474
 475         /**
 476          * Constructor for Title objects with a null return instead of an exception for invalid titles.
 477          *
 478          * Note that `namespace` is the **default** namespace only, and can be overridden by a namespace
 479          * prefix in `title`. If you do not want this behavior, use #makeTitle. See #constructor for
 480          * details.
 481          *
 482          * @static
 483          * @param {string} title
 484          * @param {number} [namespace=NS_MAIN] Default namespace
 485          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 486          */
 487         Title.newFromText = function ( title, namespace ) {
 488                 var t, parsed = parse( title, namespace );
 489                 if ( !parsed ) {
 490                         return null;
 491                 }
 492
 493                 t = createObject( Title.prototype );
 494                 t.namespace = parsed.namespace;
 495                 t.title = parsed.title;
 496                 t.ext = parsed.ext;
 497                 t.fragment = parsed.fragment;
 498
 499                 return t;
 500         };
 501
 502         /**
 503          * Constructor for Title objects with predefined namespace.
 504          *
 505          * Unlike #newFromText or #constructor, this function doesn't allow the given `namespace` to be
 506          * overridden by a namespace prefix in `title`. See #constructor for details about this behavior.
 507          *
 508          * The single exception to this is when `namespace` is 0, indicating the main namespace. The
 509          * function behaves like #newFromText in that case.
 510          *
 511          * @static
 512          * @param {number} namespace Namespace to use for the title
 513          * @param {string} title
 514          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 515          */
 516         Title.makeTitle = function ( namespace, title ) {
 517                 return mw.Title.newFromText( getNamespacePrefix( namespace ) + title );
 518         };
 519
 520         /**
 521          * Constructor for Title objects from user input altering that input to
 522          * produce a title that MediaWiki will accept as legal
 523          *
 524          * @static
 525          * @param {string} title
 526          * @param {number} [defaultNamespace=NS_MAIN]
 527          *  If given, will used as default namespace for the given title.
 528          * @param {Object} [options] additional options
 529          * @param {boolean} [options.forUploading=true]
 530          *  Makes sure that a file is uploadable under the title returned.
 531          *  There are pages in the file namespace under which file upload is impossible.
 532          *  Automatically assumed if the title is created in the Media namespace.
 533          * @return {mw.Title|null} A valid Title object or null if the input cannot be turned into a valid title
 534          */
 535         Title.newFromUserInput = function ( title, defaultNamespace, options ) {
 536                 var namespace, m, id, ext, parts;
 537
 538                 // defaultNamespace is optional; check whether options moves up
 539                 if ( arguments.length < 3 && $.type( defaultNamespace ) === 'object' ) {
 540                         options = defaultNamespace;
 541                         defaultNamespace = undefined;
 542                 }
 543
 544                 // merge options into defaults
 545                 options = $.extend( {
 546                         forUploading: true
 547                 }, options );
 548
 549                 namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
 550
 551                 // Normalise additional whitespace
 552                 title = $.trim( title.replace( /\s/g, ' ' ) );
 553
 554                 // Process initial colon
 555                 if ( title !== '' && title[ 0 ] === ':' ) {
 556                         // Initial colon means main namespace instead of specified default
 557                         namespace = NS_MAIN;
 558                         title = title
 559                                 // Strip colon
 560                                 .substr( 1 )
 561                                 // Trim underscores
 562                                 .replace( rUnderscoreTrim, '' );
 563                 }
 564
 565                 // Process namespace prefix (if any)
 566                 m = title.match( rSplit );
 567                 if ( m ) {
 568                         id = getNsIdByName( m[ 1 ] );
 569                         if ( id !== false ) {
 570                                 // Ordinary namespace
 571                                 namespace = id;
 572                                 title = m[ 2 ];
 573                         }
 574                 }
 575
 576                 if (
 577                         namespace === NS_MEDIA ||
 578                         ( options.forUploading && ( namespace === NS_FILE ) )
 579                 ) {
 580
 581                         title = sanitize( title, [ 'generalRule', 'fileRule' ] );
 582
 583                         // Operate on the file extension
 584                         // Although it is possible having spaces between the name and the ".ext" this isn't nice for
 585                         // operating systems hiding file extensions -> strip them later on
 586                         parts = title.split( '.' );
 587
 588                         if ( parts.length > 1 ) {
 589
 590                                 // Get the last part, which is supposed to be the file extension
 591                                 ext = parts.pop();
 592
 593                                 // Remove whitespace of the name part (that W/O extension)
 594                                 title = $.trim( parts.join( '.' ) );
 595
 596                                 // Cut, if too long and append file extension
 597                                 title = trimFileNameToByteLength( title, ext );
 598
 599                         } else {
 600
 601                                 // Missing file extension
 602                                 title = $.trim( parts.join( '.' ) );
 603
 604                                 // Name has no file extension and a fallback wasn't provided either
 605                                 return null;
 606                         }
 607                 } else {
 608
 609                         title = sanitize( title, [ 'generalRule' ] );
 610
 611                         // Cut titles exceeding the TITLE_MAX_BYTES byte size limit
 612                         // (size of underlying database field)
 613                         if ( namespace !== NS_SPECIAL ) {
 614                                 title = trimToByteLength( title, TITLE_MAX_BYTES );
 615                         }
 616                 }
 617
 618                 // Any remaining initial :s are illegal.
 619                 title = title.replace( /^:+/, '' );
 620
 621                 return Title.newFromText( title, namespace );
 622         };
 623
 624         /**
 625          * Sanitizes a file name as supplied by the user, originating in the user's file system
 626          * so it is most likely a valid MediaWiki title and file name after processing.
 627          * Returns null on fatal errors.
 628          *
 629          * @static
 630          * @param {string} uncleanName The unclean file name including file extension but
 631          *   without namespace
 632          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 633          */
 634         Title.newFromFileName = function ( uncleanName ) {
 635
 636                 return Title.newFromUserInput( 'File:' + uncleanName, {
 637                         forUploading: true
 638                 } );
 639         };
 640
 641         /**
 642          * Get the file title from an image element
 643          *
 644          *     var title = mw.Title.newFromImg( $( 'img:first' ) );
 645          *
 646          * @static
 647          * @param {HTMLElement|jQuery} img The image to use as a base
 648          * @return {mw.Title|null} The file title or null if unsuccessful
 649          */
 650         Title.newFromImg = function ( img ) {
 651                 var matches, i, regex, src, decodedSrc,
 652
 653                         // thumb.php-generated thumbnails
 654                         thumbPhpRegex = /thumb\.php/,
 655                         regexes = [
 656                                 // Thumbnails
 657                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)\/[^\s/]+-[^\s/]*$/,
 658
 659                                 // Full size images
 660                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)$/,
 661
 662                                 // Thumbnails in non-hashed upload directories
 663                                 /\/([^\s/]+)\/[^\s/]+-(?:\1|thumbnail)[^\s/]*$/,
 664
 665                                 // Full-size images in non-hashed upload directories
 666                                 /\/([^\s/]+)$/
 667                         ],
 668
 669                         recount = regexes.length;
 670
 671                 src = img.jquery ? img[ 0 ].src : img.src;
 672
 673                 matches = src.match( thumbPhpRegex );
 674
 675                 if ( matches ) {
 676                         return mw.Title.newFromText( 'File:' + mw.util.getParamValue( 'f', src ) );
 677                 }
 678
 679                 decodedSrc = decodeURIComponent( src );
 680
 681                 for ( i = 0; i < recount; i++ ) {
 682                         regex = regexes[ i ];
 683                         matches = decodedSrc.match( regex );
 684
 685                         if ( matches && matches[ 1 ] ) {
 686                                 return mw.Title.newFromText( 'File:' + matches[ 1 ] );
 687                         }
 688                 }
 689
 690                 return null;
 691         };
 692
 693         /**
 694          * Whether this title exists on the wiki.
 695          *
 696          * @static
 697          * @param {string|mw.Title} title prefixed db-key name (string) or instance of Title
 698          * @return {boolean|null} Boolean if the information is available, otherwise null
 699          */
 700         Title.exists = function ( title ) {
 701                 var match,
 702                         obj = Title.exist.pages;
 703
 704                 if ( typeof title === 'string' ) {
 705                         match = obj[ title ];
 706                 } else if ( title instanceof Title ) {
 707                         match = obj[ title.toString() ];
 708                 } else {
 709                         throw new Error( 'mw.Title.exists: title must be a string or an instance of Title' );
 710                 }
 711
 712                 if ( typeof match !== 'boolean' ) {
 713                         return null;
 714                 }
 715
 716                 return match;
 717         };
 718
 719         /**
 720          * Store page existence
 721          *
 722          * @static
 723          * @property {Object} exist
 724          * @property {Object} exist.pages Keyed by title. Boolean true value indicates page does exist.
 725          *
 726          * @property {Function} exist.set The setter function.
 727          *
 728          *  Example to declare existing titles:
 729          *
 730          *     Title.exist.set( ['User:John_Doe', ...] );
 731          *
 732          *  Example to declare titles nonexistent:
 733          *
 734          *     Title.exist.set( ['File:Foo_bar.jpg', ...], false );
 735          *
 736          * @property {string|Array} exist.set.titles Title(s) in strict prefixedDb title form
 737          * @property {boolean} [exist.set.state=true] State of the given titles
 738          * @return {boolean}
 739          */
 740         Title.exist = {
 741                 pages: {},
 742
 743                 set: function ( titles, state ) {
 744                         var i, len,
 745                                 pages = this.pages;
 746
 747                         titles = Array.isArray( titles ) ? titles : [ titles ];
 748                         state = state === undefined ? true : !!state;
 749
 750                         for ( i = 0, len = titles.length; i < len; i++ ) {
 751                                 pages[ titles[ i ] ] = state;
 752                         }
 753                         return true;
 754                 }
 755         };
 756
 757         /**
 758          * Normalize a file extension to the common form, making it lowercase and checking some synonyms,
 759          * and ensure it's clean. Extensions with non-alphanumeric characters will be discarded.
 760          * Keep in sync with File::normalizeExtension() in PHP.
 761          *
 762          * @param {string} extension File extension (without the leading dot)
 763          * @return {string} File extension in canonical form
 764          */
 765         Title.normalizeExtension = function ( extension ) {
 766                 var
 767                         lower = extension.toLowerCase(),
 768                         squish = {
 769                                 htm: 'html',
 770                                 jpeg: 'jpg',
 771                                 mpeg: 'mpg',
 772                                 tiff: 'tif',
 773                                 ogv: 'ogg'
 774                         };
 775                 if ( squish.hasOwnProperty( lower ) ) {
 776                         return squish[ lower ];
 777                 } else if ( /^[0-9a-z]+$/.test( lower ) ) {
 778                         return lower;
 779                 } else {
 780                         return '';
 781                 }
 782         };
 783
 784         /* Public members */
 785
 786         Title.prototype = {
 787                 constructor: Title,
 788
 789                 /**
 790                  * Get the namespace number
 791                  *
 792                  * Example: 6 for "File:Example_image.svg".
 793                  *
 794                  * @return {number}
 795                  */
 796                 getNamespaceId: function () {
 797                         return this.namespace;
 798                 },
 799
 800                 /**
 801                  * Get the namespace prefix (in the content language)
 802                  *
 803                  * Example: "File:" for "File:Example_image.svg".
 804                  * In #NS_MAIN this is '', otherwise namespace name plus ':'
 805                  *
 806                  * @return {string}
 807                  */
 808                 getNamespacePrefix: function () {
 809                         return getNamespacePrefix( this.namespace );
 810                 },
 811
 812                 /**
 813                  * Get the page name without extension or namespace prefix
 814                  *
 815                  * Example: "Example_image" for "File:Example_image.svg".
 816                  *
 817                  * For the page title (full page name without namespace prefix), see #getMain.
 818                  *
 819                  * @return {string}
 820                  */
 821                 getName: function () {
 822                         if (
 823                                 $.inArray( this.namespace, mw.config.get( 'wgCaseSensitiveNamespaces' ) ) !== -1 ||
 824                                 !this.title.length
 825                         ) {
 826                                 return this.title;
 827                         }
 828                         // PHP's strtoupper differs from String.toUpperCase in a number of cases
 829                         // Bug: T147646
 830                         return mw.Title.phpCharToUpper( this.title[ 0 ] ) + this.title.slice( 1 );
 831                 },
 832
 833                 /**
 834                  * Get the page name (transformed by #text)
 835                  *
 836                  * Example: "Example image" for "File:Example_image.svg".
 837                  *
 838                  * For the page title (full page name without namespace prefix), see #getMainText.
 839                  *
 840                  * @return {string}
 841                  */
 842                 getNameText: function () {
 843                         return text( this.getName() );
 844                 },
 845
 846                 /**
 847                  * Get the extension of the page name (if any)
 848                  *
 849                  * @return {string|null} Name extension or null if there is none
 850                  */
 851                 getExtension: function () {
 852                         return this.ext;
 853                 },
 854
 855                 /**
 856                  * Shortcut for appendable string to form the main page name.
 857                  *
 858                  * Returns a string like ".json", or "" if no extension.
 859                  *
 860                  * @return {string}
 861                  */
 862                 getDotExtension: function () {
 863                         return this.ext === null ? '' : '.' + this.ext;
 864                 },
 865
 866                 /**
 867                  * Get the main page name
 868                  *
 869                  * Example: "Example_image.svg" for "File:Example_image.svg".
 870                  *
 871                  * @return {string}
 872                  */
 873                 getMain: function () {
 874                         return this.getName() + this.getDotExtension();
 875                 },
 876
 877                 /**
 878                  * Get the main page name (transformed by #text)
 879                  *
 880                  * Example: "Example image.svg" for "File:Example_image.svg".
 881                  *
 882                  * @return {string}
 883                  */
 884                 getMainText: function () {
 885                         return text( this.getMain() );
 886                 },
 887
 888                 /**
 889                  * Get the full page name
 890                  *
 891                  * Example: "File:Example_image.svg".
 892                  * Most useful for API calls, anything that must identify the "title".
 893                  *
 894                  * @return {string}
 895                  */
 896                 getPrefixedDb: function () {
 897                         return this.getNamespacePrefix() + this.getMain();
 898                 },
 899
 900                 /**
 901                  * Get the full page name (transformed by #text)
 902                  *
 903                  * Example: "File:Example image.svg" for "File:Example_image.svg".
 904                  *
 905                  * @return {string}
 906                  */
 907                 getPrefixedText: function () {
 908                         return text( this.getPrefixedDb() );
 909                 },
 910
 911                 /**
 912                  * Get the page name relative to a namespace
 913                  *
 914                  * Example:
 915                  *
 916                  * - "Foo:Bar" relative to the Foo namespace becomes "Bar".
 917                  * - "Bar" relative to any non-main namespace becomes ":Bar".
 918                  * - "Foo:Bar" relative to any namespace other than Foo stays "Foo:Bar".
 919                  *
 920                  * @param {number} namespace The namespace to be relative to
 921                  * @return {string}
 922                  */
 923                 getRelativeText: function ( namespace ) {
 924                         if ( this.getNamespaceId() === namespace ) {
 925                                 return this.getMainText();
 926                         } else if ( this.getNamespaceId() === NS_MAIN ) {
 927                                 return ':' + this.getPrefixedText();
 928                         } else {
 929                                 return this.getPrefixedText();
 930                         }
 931                 },
 932
 933                 /**
 934                  * Get the fragment (if any).
 935                  *
 936                  * Note that this method (by design) does not include the hash character and
 937                  * the value is not url encoded.
 938                  *
 939                  * @return {string|null}
 940                  */
 941                 getFragment: function () {
 942                         return this.fragment;
 943                 },
 944
 945                 /**
 946                  * Get the URL to this title
 947                  *
 948                  * @see mw.util#getUrl
 949                  * @param {Object} [params] A mapping of query parameter names to values,
 950                  *     e.g. `{ action: 'edit' }`.
 951                  * @return {string}
 952                  */
 953                 getUrl: function ( params ) {
 954                         var fragment = this.getFragment();
 955                         if ( fragment ) {
 956                                 return mw.util.getUrl( this.toString() + '#' + fragment, params );
 957                         } else {
 958                                 return mw.util.getUrl( this.toString(), params );
 959                         }
 960                 },
 961
 962                 /**
 963                  * Whether this title exists on the wiki.
 964                  *
 965                  * @see #static-method-exists
 966                  * @return {boolean|null} Boolean if the information is available, otherwise null
 967                  */
 968                 exists: function () {
 969                         return Title.exists( this );
 970                 }
 971         };
 972
 973         /**
 974          * @alias #getPrefixedDb
 975          * @method
 976          */
 977         Title.prototype.toString = Title.prototype.getPrefixedDb;
 978
 979         /**
 980          * @alias #getPrefixedText
 981          * @method
 982          */
 983         Title.prototype.toText = Title.prototype.getPrefixedText;
 984
 985         // Expose
 986         mw.Title = Title;
 987
 988 }( mediaWiki, jQuery ) );