resources/mediawiki/mediawiki.Title.js

   1 /*!
   2  * @author Neil Kandalgaonkar, 2010
   3  * @author Timo Tijhof, 2011-2013
   4  * @since 1.18
   5  */
   6 ( function ( mw, $ ) {
   7
   8         /**
   9          * @class mw.Title
  10          *
  11          * Parse titles into an object struture. 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          * @constructor
  16          * @param {string} title Title of the page. If no second argument given,
  17          *  this will be searched for a namespace
  18          * @param {number} [namespace=NS_MAIN] If given, will used as default namespace for the given title
  19          * @throws {Error} When the title is invalid
  20          */
  21         function Title( title, namespace ) {
  22                 var parsed = parse( title, namespace );
  23                 if ( !parsed ) {
  24                         throw new Error( 'Unable to parse title' );
  25                 }
  26
  27                 this.namespace = parsed.namespace;
  28                 this.title = parsed.title;
  29                 this.ext = parsed.ext;
  30                 this.fragment = parsed.fragment;
  31
  32                 return this;
  33         }
  34
  35         /* Private members */
  36
  37         var
  38
  39         /**
  40          * @private
  41          * @static
  42          * @property NS_MAIN
  43          */
  44         NS_MAIN = 0,
  45
  46         /**
  47          * @private
  48          * @static
  49          * @property NS_TALK
  50          */
  51         NS_TALK = 1,
  52
  53         /**
  54          * @private
  55          * @static
  56          * @property NS_SPECIAL
  57          */
  58         NS_SPECIAL = -1,
  59
  60         /**
  61          * Get the namespace id from a namespace name (either from the localized, canonical or alias
  62          * name).
  63          *
  64          * Example: On a German wiki this would return 6 for any of 'File', 'Datei', 'Image' or
  65          * even 'Bild'.
  66          *
  67          * @private
  68          * @static
  69          * @method getNsIdByName
  70          * @param {string} ns Namespace name (case insensitive, leading/trailing space ignored)
  71          * @return {number|boolean} Namespace id or boolean false
  72          */
  73         getNsIdByName = function ( ns ) {
  74                 var id;
  75
  76                 // Don't cast non-strings to strings, because null or undefined should not result in
  77                 // returning the id of a potential namespace called "Null:" (e.g. on null.example.org/wiki)
  78                 // Also, toLowerCase throws exception on null/undefined, because it is a String method.
  79                 if ( typeof ns !== 'string' ) {
  80                         return false;
  81                 }
  82                 ns = ns.toLowerCase();
  83                 id = mw.config.get( 'wgNamespaceIds' )[ns];
  84                 if ( id === undefined ) {
  85                         return false;
  86                 }
  87                 return id;
  88         },
  89
  90         rUnderscoreTrim = /^_+|_+$/g,
  91
  92         rSplit = /^(.+?)_*:_*(.*)$/,
  93
  94         // See Title.php#getTitleInvalidRegex
  95         rInvalid = new RegExp(
  96                 '[^' + mw.config.get( 'wgLegalTitleChars' ) + ']' +
  97                 // URL percent encoding sequences interfere with the ability
  98                 // to round-trip titles -- you can't link to them consistently.
  99                 '|%[0-9A-Fa-f]{2}' +
 100                 // XML/HTML character references produce similar issues.
 101                 '|&[A-Za-z0-9\u0080-\uFFFF]+;' +
 102                 '|&#[0-9]+;' +
 103                 '|&#x[0-9A-Fa-f]+;'
 104         ),
 105
 106         /**
 107          * Internal helper for #constructor and #newFromtext.
 108          *
 109          * Based on Title.php#secureAndSplit
 110          *
 111          * @private
 112          * @static
 113          * @method parse
 114          * @param {string} title
 115          * @param {number} [defaultNamespace=NS_MAIN]
 116          * @return {Object|boolean}
 117          */
 118         parse = function ( title, defaultNamespace ) {
 119                 var namespace, m, id, i, fragment, ext;
 120
 121                 namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
 122
 123                 title = title
 124                         // Normalise whitespace to underscores and remove duplicates
 125                         .replace( /[ _\s]+/g, '_' )
 126                         // Trim underscores
 127                         .replace( rUnderscoreTrim, '' );
 128
 129                 // Process initial colon
 130                 if ( title !== '' && title.charAt( 0 ) === ':' ) {
 131                         // Initial colon means main namespace instead of specified default
 132                         namespace = NS_MAIN;
 133                         title = title
 134                                 // Strip colon
 135                                 .substr( 1 )
 136                                 // Trim underscores
 137                                 .replace( rUnderscoreTrim, '' );
 138                 }
 139
 140                 if ( title === '' ) {
 141                         return false;
 142                 }
 143
 144                 // Process namespace prefix (if any)
 145                 m = title.match( rSplit );
 146                 if ( m ) {
 147                         id = getNsIdByName( m[1] );
 148                         if ( id !== false ) {
 149                                 // Ordinary namespace
 150                                 namespace = id;
 151                                 title = m[2];
 152
 153                                 // For Talk:X pages, make sure X has no "namespace" prefix
 154                                 if ( namespace === NS_TALK && ( m = title.match( rSplit ) ) ) {
 155                                         // Disallow titles like Talk:File:x (subject should roundtrip: talk:file:x -> file:x -> file_talk:x)
 156                                         if ( getNsIdByName( m[1] ) !== false ) {
 157                                                 return false;
 158                                         }
 159                                 }
 160                         }
 161                 }
 162
 163                 // Process fragment
 164                 i = title.indexOf( '#' );
 165                 if ( i === -1 ) {
 166                         fragment = null;
 167                 } else {
 168                         fragment = title
 169                                 // Get segment starting after the hash
 170                                 .substr( i + 1 )
 171                                 // Convert to text
 172                                 // NB: Must not be trimmed ("Example#_foo" is not the same as "Example#foo")
 173                                 .replace( /_/g, ' ' );
 174
 175                         title = title
 176                                 // Strip hash
 177                                 .substr( 0, i )
 178                                 // Trim underscores, again (strips "_" from "bar" in "Foo_bar_#quux")
 179                                 .replace( rUnderscoreTrim, '' );
 180                 }
 181
 182
 183                 // Reject illegal characters
 184                 if ( title.match( rInvalid ) ) {
 185                         return false;
 186                 }
 187
 188                 // Disallow titles that browsers or servers might resolve as directory navigation
 189                 if (
 190                         title.indexOf( '.' ) !== -1 && (
 191                                 title === '.' || title === '..' ||
 192                                 title.indexOf( './' ) === 0 ||
 193                                 title.indexOf( '../' ) === 0 ||
 194                                 title.indexOf( '/./' ) !== -1 ||
 195                                 title.indexOf( '/../' ) !== -1 ||
 196                                 title.substr( title.length - 2 ) === '/.' ||
 197                                 title.substr( title.length - 3 ) === '/..'
 198                         )
 199                 ) {
 200                         return false;
 201                 }
 202
 203                 // Disallow magic tilde sequence
 204                 if ( title.indexOf( '~~~' ) !== -1 ) {
 205                         return false;
 206                 }
 207
 208                 // Disallow titles exceeding the 255 byte size limit (size of underlying database field)
 209                 // Except for special pages, e.g. [[Special:Block/Long name]]
 210                 // Note: The PHP implementation also asserts that even in NS_SPECIAL, the title should
 211                 // be less than 512 bytes.
 212                 if ( namespace !== NS_SPECIAL && $.byteLength( title ) > 255 ) {
 213                         return false;
 214                 }
 215
 216                 // Can't make a link to a namespace alone.
 217                 if ( title === '' && namespace !== NS_MAIN ) {
 218                         return false;
 219                 }
 220
 221                 // Any remaining initial :s are illegal.
 222                 if ( title.charAt( 0 ) === ':' ) {
 223                         return false;
 224                 }
 225
 226                 // For backwards-compatibility with old mw.Title, we separate the extension from the
 227                 // rest of the title.
 228                 i = title.lastIndexOf( '.' );
 229                 if ( i === -1 || title.length <= i + 1 ) {
 230                         // Extensions are the non-empty segment after the last dot
 231                         ext = null;
 232                 } else {
 233                         ext = title.substr( i + 1 );
 234                         title = title.substr( 0, i );
 235                 }
 236
 237                 return {
 238                         namespace: namespace,
 239                         title: title,
 240                         ext: ext,
 241                         fragment: fragment
 242                 };
 243         },
 244
 245         /**
 246          * Convert db-key to readable text.
 247          *
 248          * @private
 249          * @static
 250          * @method text
 251          * @param {string} s
 252          * @return {string}
 253          */
 254         text = function ( s ) {
 255                 if ( s !== null && s !== undefined ) {
 256                         return s.replace( /_/g, ' ' );
 257                 } else {
 258                         return '';
 259                 }
 260         },
 261
 262         // Polyfill for ES5 Object.create
 263         createObject = Object.create || ( function () {
 264                 return function ( o ) {
 265                         function Title() {}
 266                         if ( o !== Object( o ) ) {
 267                                 throw new Error( 'Cannot inherit from a non-object' );
 268                         }
 269                         Title.prototype = o;
 270                         return new Title();
 271                 };
 272         }() );
 273
 274
 275         /* Static members */
 276
 277         /**
 278          * Constructor for Title objects with a null return instead of an exception for invalid titles.
 279          *
 280          * @static
 281          * @method
 282          * @param {string} title
 283          * @param {number} [namespace=NS_MAIN] Default namespace
 284          * @return {mw.Title|null} A valid Title object or null if the title is invalid
 285          */
 286         Title.newFromText = function ( title, namespace ) {
 287                 var t, parsed = parse( title, namespace );
 288                 if ( !parsed ) {
 289                         return null;
 290                 }
 291
 292                 t = createObject( Title.prototype );
 293                 t.namespace = parsed.namespace;
 294                 t.title = parsed.title;
 295                 t.ext = parsed.ext;
 296                 t.fragment = parsed.fragment;
 297
 298                 return t;
 299         };
 300
 301         /**
 302          * Get the file title from an image element
 303          *
 304          *     var title = mw.Title.newFromImg( $( 'img:first' ) );
 305          *
 306          * @static
 307          * @param {HTMLElement|jQuery} img The image to use as a base
 308          * @return {mw.Title|null} The file title or null if unsuccessful
 309          */
 310         Title.newFromImg = function ( img ) {
 311                 var matches, i, regex, src, decodedSrc,
 312
 313                         // thumb.php-generated thumbnails
 314                         thumbPhpRegex = /thumb\.php/,
 315                         regexes = [
 316                                 // Thumbnails
 317                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s\/]+)\/[^\s\/]+-(?:\1|thumbnail)[^\s\/]*$/,
 318
 319                                 // Thumbnails in non-hashed upload directories
 320                                 /\/([^\s\/]+)\/[^\s\/]+-(?:\1|thumbnail)[^\s\/]*$/,
 321
 322                                 // Full size images
 323                                 /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s\/]+)$/,
 324
 325                                 // Full-size images in non-hashed upload directories
 326                                 /\/([^\s\/]+)$/
 327                         ],
 328
 329                         recount = regexes.length;
 330
 331                 src = img.jquery ? img[0].src : img.src;
 332
 333                 matches = src.match( thumbPhpRegex );
 334
 335                 if ( matches ) {
 336                         return mw.Title.newFromText( 'File:' + mw.util.getParamValue( 'f', src ) );
 337                 }
 338
 339                 decodedSrc = decodeURIComponent( src );
 340
 341                 for ( i = 0; i < recount; i++ ) {
 342                         regex = regexes[i];
 343                         matches = decodedSrc.match( regex );
 344
 345                         if ( matches && matches[1] ) {
 346                                 return mw.Title.newFromText( 'File:' + matches[1] );
 347                         }
 348                 }
 349
 350                 return null;
 351         };
 352
 353         /**
 354          * Whether this title exists on the wiki.
 355          *
 356          * @static
 357          * @param {string|mw.Title} title prefixed db-key name (string) or instance of Title
 358          * @return {boolean|null} Boolean if the information is available, otherwise null
 359          */
 360         Title.exists = function ( title ) {
 361                 var match,
 362                         type = $.type( title ),
 363                         obj = Title.exist.pages;
 364
 365                 if ( type === 'string' ) {
 366                         match = obj[title];
 367                 } else if ( type === 'object' && title instanceof Title ) {
 368                         match = obj[title.toString()];
 369                 } else {
 370                         throw new Error( 'mw.Title.exists: title must be a string or an instance of Title' );
 371                 }
 372
 373                 if ( typeof match === 'boolean' ) {
 374                         return match;
 375                 }
 376
 377                 return null;
 378         };
 379
 380         Title.exist = {
 381                 /**
 382                  * Boolean true value indicates page does exist.
 383                  *
 384                  * @static
 385                  * @property {Object} exist.pages Keyed by PrefixedDb title.
 386                  */
 387                 pages: {},
 388
 389                 /**
 390                  * Example to declare existing titles:
 391                  *     Title.exist.set( ['User:John_Doe', ...] );
 392                  * Eample to declare titles nonexistent:
 393                  *     Title.exist.set( ['File:Foo_bar.jpg', ...], false );
 394                  *
 395                  * @static
 396                  * @property exist.set
 397                  * @param {string|Array} titles Title(s) in strict prefixedDb title form
 398                  * @param {boolean} [state=true] State of the given titles
 399                  * @return {boolean}
 400                  */
 401                 set: function ( titles, state ) {
 402                         titles = $.isArray( titles ) ? titles : [titles];
 403                         state = state === undefined ? true : !!state;
 404                         var pages = this.pages, i, len = titles.length;
 405                         for ( i = 0; i < len; i++ ) {
 406                                 pages[ titles[i] ] = state;
 407                         }
 408                         return true;
 409                 }
 410         };
 411
 412         /* Public members */
 413
 414         Title.prototype = {
 415                 constructor: Title,
 416
 417                 /**
 418                  * Get the namespace number
 419                  *
 420                  * Example: 6 for "File:Example_image.svg".
 421                  *
 422                  * @return {number}
 423                  */
 424                 getNamespaceId: function () {
 425                         return this.namespace;
 426                 },
 427
 428                 /**
 429                  * Get the namespace prefix (in the content language)
 430                  *
 431                  * Example: "File:" for "File:Example_image.svg".
 432                  * In #NS_MAIN this is '', otherwise namespace name plus ':'
 433                  *
 434                  * @return {string}
 435                  */
 436                 getNamespacePrefix: function () {
 437                         return this.namespace === NS_MAIN ?
 438                                 '' :
 439                                 ( mw.config.get( 'wgFormattedNamespaces' )[ this.namespace ].replace( / /g, '_' ) + ':' );
 440                 },
 441
 442                 /**
 443                  * Get the page name without extension or namespace prefix
 444                  *
 445                  * Example: "Example_image" for "File:Example_image.svg".
 446                  *
 447                  * For the page title (full page name without namespace prefix), see #getMain.
 448                  *
 449                  * @return {string}
 450                  */
 451                 getName: function () {
 452                         if ( $.inArray( this.namespace, mw.config.get( 'wgCaseSensitiveNamespaces' ) ) !== -1 ) {
 453                                 return this.title;
 454                         } else {
 455                                 return $.ucFirst( this.title );
 456                         }
 457                 },
 458
 459                 /**
 460                  * Get the page name (transformed by #text)
 461                  *
 462                  * Example: "Example image" for "File:Example_image.svg".
 463                  *
 464                  * For the page title (full page name without namespace prefix), see #getMainText.
 465                  *
 466                  * @return {string}
 467                  */
 468                 getNameText: function () {
 469                         return text( this.getName() );
 470                 },
 471
 472                 /**
 473                  * Get the extension of the page name (if any)
 474                  *
 475                  * @return {string|null} Name extension or null if there is none
 476                  */
 477                 getExtension: function () {
 478                         return this.ext;
 479                 },
 480
 481                 /**
 482                  * Shortcut for appendable string to form the main page name.
 483                  *
 484                  * Returns a string like ".json", or "" if no extension.
 485                  *
 486                  * @return {string}
 487                  */
 488                 getDotExtension: function () {
 489                         return this.ext === null ? '' : '.' + this.ext;
 490                 },
 491
 492                 /**
 493                  * Get the main page name (transformed by #text)
 494                  *
 495                  * Example: "Example_image.svg" for "File:Example_image.svg".
 496                  *
 497                  * @return {string}
 498                  */
 499                 getMain: function () {
 500                         return this.getName() + this.getDotExtension();
 501                 },
 502
 503                 /**
 504                  * Get the main page name (transformed by #text)
 505                  *
 506                  * Example: "Example image.svg" for "File:Example_image.svg".
 507                  *
 508                  * @return {string}
 509                  */
 510                 getMainText: function () {
 511                         return text( this.getMain() );
 512                 },
 513
 514                 /**
 515                  * Get the full page name
 516                  *
 517                  * Eaxample: "File:Example_image.svg".
 518                  * Most useful for API calls, anything that must identify the "title".
 519                  *
 520                  * @return {string}
 521                  */
 522                 getPrefixedDb: function () {
 523                         return this.getNamespacePrefix() + this.getMain();
 524                 },
 525
 526                 /**
 527                  * Get the full page name (transformed by #text)
 528                  *
 529                  * Example: "File:Example image.svg" for "File:Example_image.svg".
 530                  *
 531                  * @return {string}
 532                  */
 533                 getPrefixedText: function () {
 534                         return text( this.getPrefixedDb() );
 535                 },
 536
 537                 /**
 538                  * Get the fragment (if any).
 539                  *
 540                  * Note that this method (by design) does not include the hash character and
 541                  * the value is not url encoded.
 542                  *
 543                  * @return {string|null}
 544                  */
 545                 getFragment: function () {
 546                         return this.fragment;
 547                 },
 548
 549                 /**
 550                  * Get the URL to this title
 551                  *
 552                  * @see mw.util#getUrl
 553                  * @param {Object} [params] A mapping of query parameter names to values,
 554                  *     e.g. `{ action: 'edit' }`.
 555                  * @return {string}
 556                  */
 557                 getUrl: function ( params ) {
 558                         return mw.util.getUrl( this.toString(), params );
 559                 },
 560
 561                 /**
 562                  * Whether this title exists on the wiki.
 563                  *
 564                  * @see #static-method-exists
 565                  * @return {boolean|null} Boolean if the information is available, otherwise null
 566                  */
 567                 exists: function () {
 568                         return Title.exists( this );
 569                 }
 570         };
 571
 572         /**
 573          * @alias #getPrefixedDb
 574          * @method
 575          */
 576         Title.prototype.toString = Title.prototype.getPrefixedDb;
 577
 578
 579         /**
 580          * @alias #getPrefixedText
 581          * @method
 582          */
 583         Title.prototype.toText = Title.prototype.getPrefixedText;
 584
 585         // Expose
 586         mw.Title = Title;
 587
 588 }( mediaWiki, jQuery ) );