]> scripts.mit.edu Git - autoinstallsdev/mediawiki.git/blobdiff - resources/src/mediawiki/mediawiki.Title.js
MediaWiki 1.30.2
[autoinstallsdev/mediawiki.git] / resources / src / mediawiki / mediawiki.Title.js
diff --git a/resources/src/mediawiki/mediawiki.Title.js b/resources/src/mediawiki/mediawiki.Title.js
new file mode 100644 (file)
index 0000000..53cbd60
--- /dev/null
@@ -0,0 +1,976 @@
+/*!
+ * @author Neil Kandalgaonkar, 2010
+ * @author Timo Tijhof, 2011-2013
+ * @since 1.18
+ */
+
+/* eslint-disable no-use-before-define */
+
+( function ( mw, $ ) {
+       /**
+        * Parse titles into an object structure. Note that when using the constructor
+        * directly, passing invalid titles will result in an exception. Use #newFromText to use the
+        * logic directly and get null for invalid titles which is easier to work with.
+        *
+        * Note that in the constructor and #newFromText method, `namespace` is the **default** namespace
+        * only, and can be overridden by a namespace prefix in `title`. If you do not want this behavior,
+        * use #makeTitle. Compare:
+        *
+        *     new mw.Title( 'Foo', NS_TEMPLATE ).getPrefixedText();                  // => 'Template:Foo'
+        *     mw.Title.newFromText( 'Foo', NS_TEMPLATE ).getPrefixedText();          // => 'Template:Foo'
+        *     mw.Title.makeTitle( NS_TEMPLATE, 'Foo' ).getPrefixedText();            // => 'Template:Foo'
+        *
+        *     new mw.Title( 'Category:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Category:Foo'
+        *     mw.Title.newFromText( 'Category:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Category:Foo'
+        *     mw.Title.makeTitle( NS_TEMPLATE, 'Category:Foo' ).getPrefixedText();   // => 'Template:Category:Foo'
+        *
+        *     new mw.Title( 'Template:Foo', NS_TEMPLATE ).getPrefixedText();         // => 'Template:Foo'
+        *     mw.Title.newFromText( 'Template:Foo', NS_TEMPLATE ).getPrefixedText(); // => 'Template:Foo'
+        *     mw.Title.makeTitle( NS_TEMPLATE, 'Template:Foo' ).getPrefixedText();   // => 'Template:Template:Foo'
+        *
+        * @class mw.Title
+        * @constructor
+        * @param {string} title Title of the page. If no second argument given,
+        *  this will be searched for a namespace
+        * @param {number} [namespace=NS_MAIN] If given, will used as default namespace for the given title
+        * @throws {Error} When the title is invalid
+        */
+       function Title( title, namespace ) {
+               var parsed = parse( title, namespace );
+               if ( !parsed ) {
+                       throw new Error( 'Unable to parse title' );
+               }
+
+               this.namespace = parsed.namespace;
+               this.title = parsed.title;
+               this.ext = parsed.ext;
+               this.fragment = parsed.fragment;
+       }
+
+       /* Private members */
+
+       // eslint-disable-next-line vars-on-top
+       var
+               namespaceIds = mw.config.get( 'wgNamespaceIds' ),
+
+               /**
+                * @private
+                * @static
+                * @property NS_MAIN
+                */
+               NS_MAIN = namespaceIds[ '' ],
+
+               /**
+                * @private
+                * @static
+                * @property NS_TALK
+                */
+               NS_TALK = namespaceIds.talk,
+
+               /**
+                * @private
+                * @static
+                * @property NS_SPECIAL
+                */
+               NS_SPECIAL = namespaceIds.special,
+
+               /**
+                * @private
+                * @static
+                * @property NS_MEDIA
+                */
+               NS_MEDIA = namespaceIds.media,
+
+               /**
+                * @private
+                * @static
+                * @property NS_FILE
+                */
+               NS_FILE = namespaceIds.file,
+
+               /**
+                * @private
+                * @static
+                * @property FILENAME_MAX_BYTES
+                */
+               FILENAME_MAX_BYTES = 240,
+
+               /**
+                * @private
+                * @static
+                * @property TITLE_MAX_BYTES
+                */
+               TITLE_MAX_BYTES = 255,
+
+               /**
+                * Get the namespace id from a namespace name (either from the localized, canonical or alias
+                * name).
+                *
+                * Example: On a German wiki this would return 6 for any of 'File', 'Datei', 'Image' or
+                * even 'Bild'.
+                *
+                * @private
+                * @static
+                * @method getNsIdByName
+                * @param {string} ns Namespace name (case insensitive, leading/trailing space ignored)
+                * @return {number|boolean} Namespace id or boolean false
+                */
+               getNsIdByName = function ( ns ) {
+                       var id;
+
+                       // Don't cast non-strings to strings, because null or undefined should not result in
+                       // returning the id of a potential namespace called "Null:" (e.g. on null.example.org/wiki)
+                       // Also, toLowerCase throws exception on null/undefined, because it is a String method.
+                       if ( typeof ns !== 'string' ) {
+                               return false;
+                       }
+                       // TODO: Should just use local var namespaceIds here but it
+                       // breaks test which modify the config
+                       id = mw.config.get( 'wgNamespaceIds' )[ ns.toLowerCase() ];
+                       if ( id === undefined ) {
+                               return false;
+                       }
+                       return id;
+               },
+
+               /**
+                * @private
+                * @method getNamespacePrefix_
+                * @param {number} namespace
+                * @return {string}
+                */
+               getNamespacePrefix = function ( namespace ) {
+                       return namespace === NS_MAIN ?
+                               '' :
+                               ( mw.config.get( 'wgFormattedNamespaces' )[ namespace ].replace( / /g, '_' ) + ':' );
+               },
+
+               rUnderscoreTrim = /^_+|_+$/g,
+
+               rSplit = /^(.+?)_*:_*(.*)$/,
+
+               // See MediaWikiTitleCodec.php#getTitleInvalidRegex
+               rInvalid = new RegExp(
+                       '[^' + mw.config.get( 'wgLegalTitleChars' ) + ']' +
+                       // URL percent encoding sequences interfere with the ability
+                       // to round-trip titles -- you can't link to them consistently.
+                       '|%[0-9A-Fa-f]{2}' +
+                       // XML/HTML character references produce similar issues.
+                       '|&[A-Za-z0-9\u0080-\uFFFF]+;' +
+                       '|&#[0-9]+;' +
+                       '|&#x[0-9A-Fa-f]+;'
+               ),
+
+               // From MediaWikiTitleCodec::splitTitleString() in PHP
+               // Note that this is not equivalent to /\s/, e.g. underscore is included, tab is not included.
+               rWhitespace = /[ _\u00A0\u1680\u180E\u2000-\u200A\u2028\u2029\u202F\u205F\u3000]+/g,
+
+               // From MediaWikiTitleCodec::splitTitleString() in PHP
+               rUnicodeBidi = /[\u200E\u200F\u202A-\u202E]/g,
+
+               /**
+                * Slightly modified from Flinfo. Credit goes to Lupo and Flominator.
+                * @private
+                * @static
+                * @property sanitationRules
+                */
+               sanitationRules = [
+                       // "signature"
+                       {
+                               pattern: /~{3}/g,
+                               replace: '',
+                               generalRule: true
+                       },
+                       // control characters
+                       {
+                               // eslint-disable-next-line no-control-regex
+                               pattern: /[\x00-\x1f\x7f]/g,
+                               replace: '',
+                               generalRule: true
+                       },
+                       // URL encoding (possibly)
+                       {
+                               pattern: /%([0-9A-Fa-f]{2})/g,
+                               replace: '% $1',
+                               generalRule: true
+                       },
+                       // HTML-character-entities
+                       {
+                               pattern: /&(([A-Za-z0-9\x80-\xff]+|#[0-9]+|#x[0-9A-Fa-f]+);)/g,
+                               replace: '& $1',
+                               generalRule: true
+                       },
+                       // slash, colon (not supported by file systems like NTFS/Windows, Mac OS 9 [:], ext4 [/])
+                       {
+                               pattern: new RegExp( '[' + mw.config.get( 'wgIllegalFileChars', '' ) + ']', 'g' ),
+                               replace: '-',
+                               fileRule: true
+                       },
+                       // brackets, greater than
+                       {
+                               pattern: /[}\]>]/g,
+                               replace: ')',
+                               generalRule: true
+                       },
+                       // brackets, lower than
+                       {
+                               pattern: /[{[<]/g,
+                               replace: '(',
+                               generalRule: true
+                       },
+                       // everything that wasn't covered yet
+                       {
+                               pattern: new RegExp( rInvalid.source, 'g' ),
+                               replace: '-',
+                               generalRule: true
+                       },
+                       // directory structures
+                       {
+                               pattern: /^(\.|\.\.|\.\/.*|\.\.\/.*|.*\/\.\/.*|.*\/\.\.\/.*|.*\/\.|.*\/\.\.)$/g,
+                               replace: '',
+                               generalRule: true
+                       }
+               ],
+
+               /**
+                * Internal helper for #constructor and #newFromText.
+                *
+                * Based on Title.php#secureAndSplit
+                *
+                * @private
+                * @static
+                * @method parse
+                * @param {string} title
+                * @param {number} [defaultNamespace=NS_MAIN]
+                * @return {Object|boolean}
+                */
+               parse = function ( title, defaultNamespace ) {
+                       var namespace, m, id, i, fragment, ext;
+
+                       namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
+
+                       title = title
+                               // Strip Unicode bidi override characters
+                               .replace( rUnicodeBidi, '' )
+                               // Normalise whitespace to underscores and remove duplicates
+                               .replace( rWhitespace, '_' )
+                               // Trim underscores
+                               .replace( rUnderscoreTrim, '' );
+
+                       // Process initial colon
+                       if ( title !== '' && title[ 0 ] === ':' ) {
+                               // Initial colon means main namespace instead of specified default
+                               namespace = NS_MAIN;
+                               title = title
+                                       // Strip colon
+                                       .slice( 1 )
+                                       // Trim underscores
+                                       .replace( rUnderscoreTrim, '' );
+                       }
+
+                       if ( title === '' ) {
+                               return false;
+                       }
+
+                       // Process namespace prefix (if any)
+                       m = title.match( rSplit );
+                       if ( m ) {
+                               id = getNsIdByName( m[ 1 ] );
+                               if ( id !== false ) {
+                                       // Ordinary namespace
+                                       namespace = id;
+                                       title = m[ 2 ];
+
+                                       // For Talk:X pages, make sure X has no "namespace" prefix
+                                       if ( namespace === NS_TALK && ( m = title.match( rSplit ) ) ) {
+                                               // Disallow titles like Talk:File:x (subject should roundtrip: talk:file:x -> file:x -> file_talk:x)
+                                               if ( getNsIdByName( m[ 1 ] ) !== false ) {
+                                                       return false;
+                                               }
+                                       }
+                               }
+                       }
+
+                       // Process fragment
+                       i = title.indexOf( '#' );
+                       if ( i === -1 ) {
+                               fragment = null;
+                       } else {
+                               fragment = title
+                                       // Get segment starting after the hash
+                                       .slice( i + 1 )
+                                       // Convert to text
+                                       // NB: Must not be trimmed ("Example#_foo" is not the same as "Example#foo")
+                                       .replace( /_/g, ' ' );
+
+                               title = title
+                                       // Strip hash
+                                       .slice( 0, i )
+                                       // Trim underscores, again (strips "_" from "bar" in "Foo_bar_#quux")
+                                       .replace( rUnderscoreTrim, '' );
+                       }
+
+                       // Reject illegal characters
+                       if ( title.match( rInvalid ) ) {
+                               return false;
+                       }
+
+                       // Disallow titles that browsers or servers might resolve as directory navigation
+                       if (
+                               title.indexOf( '.' ) !== -1 && (
+                                       title === '.' || title === '..' ||
+                                       title.indexOf( './' ) === 0 ||
+                                       title.indexOf( '../' ) === 0 ||
+                                       title.indexOf( '/./' ) !== -1 ||
+                                       title.indexOf( '/../' ) !== -1 ||
+                                       title.slice( -2 ) === '/.' ||
+                                       title.slice( -3 ) === '/..'
+                               )
+                       ) {
+                               return false;
+                       }
+
+                       // Disallow magic tilde sequence
+                       if ( title.indexOf( '~~~' ) !== -1 ) {
+                               return false;
+                       }
+
+                       // Disallow titles exceeding the TITLE_MAX_BYTES byte size limit (size of underlying database field)
+                       // Except for special pages, e.g. [[Special:Block/Long name]]
+                       // Note: The PHP implementation also asserts that even in NS_SPECIAL, the title should
+                       // be less than 512 bytes.
+                       if ( namespace !== NS_SPECIAL && $.byteLength( title ) > TITLE_MAX_BYTES ) {
+                               return false;
+                       }
+
+                       // Can't make a link to a namespace alone.
+                       if ( title === '' && namespace !== NS_MAIN ) {
+                               return false;
+                       }
+
+                       // Any remaining initial :s are illegal.
+                       if ( title[ 0 ] === ':' ) {
+                               return false;
+                       }
+
+                       // For backwards-compatibility with old mw.Title, we separate the extension from the
+                       // rest of the title.
+                       i = title.lastIndexOf( '.' );
+                       if ( i === -1 || title.length <= i + 1 ) {
+                               // Extensions are the non-empty segment after the last dot
+                               ext = null;
+                       } else {
+                               ext = title.slice( i + 1 );
+                               title = title.slice( 0, i );
+                       }
+
+                       return {
+                               namespace: namespace,
+                               title: title,
+                               ext: ext,
+                               fragment: fragment
+                       };
+               },
+
+               /**
+                * Convert db-key to readable text.
+                *
+                * @private
+                * @static
+                * @method text
+                * @param {string} s
+                * @return {string}
+                */
+               text = function ( s ) {
+                       if ( s !== null && s !== undefined ) {
+                               return s.replace( /_/g, ' ' );
+                       } else {
+                               return '';
+                       }
+               },
+
+               /**
+                * Sanitizes a string based on a rule set and a filter
+                *
+                * @private
+                * @static
+                * @method sanitize
+                * @param {string} s
+                * @param {Array} filter
+                * @return {string}
+                */
+               sanitize = function ( s, filter ) {
+                       var i, ruleLength, rule, m, filterLength,
+                               rules = sanitationRules;
+
+                       for ( i = 0, ruleLength = rules.length; i < ruleLength; ++i ) {
+                               rule = rules[ i ];
+                               for ( m = 0, filterLength = filter.length; m < filterLength; ++m ) {
+                                       if ( rule[ filter[ m ] ] ) {
+                                               s = s.replace( rule.pattern, rule.replace );
+                                       }
+                               }
+                       }
+                       return s;
+               },
+
+               /**
+                * Cuts a string to a specific byte length, assuming UTF-8
+                * or less, if the last character is a multi-byte one
+                *
+                * @private
+                * @static
+                * @method trimToByteLength
+                * @param {string} s
+                * @param {number} length
+                * @return {string}
+                */
+               trimToByteLength = function ( s, length ) {
+                       var byteLength, chopOffChars, chopOffBytes;
+
+                       // bytelength is always greater or equal to the length in characters
+                       s = s.substr( 0, length );
+                       while ( ( byteLength = $.byteLength( s ) ) > length ) {
+                               // Calculate how many characters can be safely removed
+                               // First, we need to know how many bytes the string exceeds the threshold
+                               chopOffBytes = byteLength - length;
+                               // A character in UTF-8 is at most 4 bytes
+                               // One character must be removed in any case because the
+                               // string is too long
+                               chopOffChars = Math.max( 1, Math.floor( chopOffBytes / 4 ) );
+                               s = s.substr( 0, s.length - chopOffChars );
+                       }
+                       return s;
+               },
+
+               /**
+                * Cuts a file name to a specific byte length
+                *
+                * @private
+                * @static
+                * @method trimFileNameToByteLength
+                * @param {string} name without extension
+                * @param {string} extension file extension
+                * @return {string} The full name, including extension
+                */
+               trimFileNameToByteLength = function ( name, extension ) {
+                       // There is a special byte limit for file names and ... remember the dot
+                       return trimToByteLength( name, FILENAME_MAX_BYTES - extension.length - 1 ) + '.' + extension;
+               };
+
+       /* Static members */
+
+       /**
+        * Constructor for Title objects with a null return instead of an exception for invalid titles.
+        *
+        * Note that `namespace` is the **default** namespace only, and can be overridden by a namespace
+        * prefix in `title`. If you do not want this behavior, use #makeTitle. See #constructor for
+        * details.
+        *
+        * @static
+        * @param {string} title
+        * @param {number} [namespace=NS_MAIN] Default namespace
+        * @return {mw.Title|null} A valid Title object or null if the title is invalid
+        */
+       Title.newFromText = function ( title, namespace ) {
+               var t, parsed = parse( title, namespace );
+               if ( !parsed ) {
+                       return null;
+               }
+
+               t = Object.create( Title.prototype );
+               t.namespace = parsed.namespace;
+               t.title = parsed.title;
+               t.ext = parsed.ext;
+               t.fragment = parsed.fragment;
+
+               return t;
+       };
+
+       /**
+        * Constructor for Title objects with predefined namespace.
+        *
+        * Unlike #newFromText or #constructor, this function doesn't allow the given `namespace` to be
+        * overridden by a namespace prefix in `title`. See #constructor for details about this behavior.
+        *
+        * The single exception to this is when `namespace` is 0, indicating the main namespace. The
+        * function behaves like #newFromText in that case.
+        *
+        * @static
+        * @param {number} namespace Namespace to use for the title
+        * @param {string} title
+        * @return {mw.Title|null} A valid Title object or null if the title is invalid
+        */
+       Title.makeTitle = function ( namespace, title ) {
+               return mw.Title.newFromText( getNamespacePrefix( namespace ) + title );
+       };
+
+       /**
+        * Constructor for Title objects from user input altering that input to
+        * produce a title that MediaWiki will accept as legal
+        *
+        * @static
+        * @param {string} title
+        * @param {number} [defaultNamespace=NS_MAIN]
+        *  If given, will used as default namespace for the given title.
+        * @param {Object} [options] additional options
+        * @param {boolean} [options.forUploading=true]
+        *  Makes sure that a file is uploadable under the title returned.
+        *  There are pages in the file namespace under which file upload is impossible.
+        *  Automatically assumed if the title is created in the Media namespace.
+        * @return {mw.Title|null} A valid Title object or null if the input cannot be turned into a valid title
+        */
+       Title.newFromUserInput = function ( title, defaultNamespace, options ) {
+               var namespace, m, id, ext, parts;
+
+               // defaultNamespace is optional; check whether options moves up
+               if ( arguments.length < 3 && $.type( defaultNamespace ) === 'object' ) {
+                       options = defaultNamespace;
+                       defaultNamespace = undefined;
+               }
+
+               // merge options into defaults
+               options = $.extend( {
+                       forUploading: true
+               }, options );
+
+               namespace = defaultNamespace === undefined ? NS_MAIN : defaultNamespace;
+
+               // Normalise additional whitespace
+               title = $.trim( title.replace( /\s/g, ' ' ) );
+
+               // Process initial colon
+               if ( title !== '' && title[ 0 ] === ':' ) {
+                       // Initial colon means main namespace instead of specified default
+                       namespace = NS_MAIN;
+                       title = title
+                               // Strip colon
+                               .substr( 1 )
+                               // Trim underscores
+                               .replace( rUnderscoreTrim, '' );
+               }
+
+               // Process namespace prefix (if any)
+               m = title.match( rSplit );
+               if ( m ) {
+                       id = getNsIdByName( m[ 1 ] );
+                       if ( id !== false ) {
+                               // Ordinary namespace
+                               namespace = id;
+                               title = m[ 2 ];
+                       }
+               }
+
+               if (
+                       namespace === NS_MEDIA ||
+                       ( options.forUploading && ( namespace === NS_FILE ) )
+               ) {
+
+                       title = sanitize( title, [ 'generalRule', 'fileRule' ] );
+
+                       // Operate on the file extension
+                       // Although it is possible having spaces between the name and the ".ext" this isn't nice for
+                       // operating systems hiding file extensions -> strip them later on
+                       parts = title.split( '.' );
+
+                       if ( parts.length > 1 ) {
+
+                               // Get the last part, which is supposed to be the file extension
+                               ext = parts.pop();
+
+                               // Remove whitespace of the name part (that W/O extension)
+                               title = $.trim( parts.join( '.' ) );
+
+                               // Cut, if too long and append file extension
+                               title = trimFileNameToByteLength( title, ext );
+
+                       } else {
+
+                               // Missing file extension
+                               title = $.trim( parts.join( '.' ) );
+
+                               // Name has no file extension and a fallback wasn't provided either
+                               return null;
+                       }
+               } else {
+
+                       title = sanitize( title, [ 'generalRule' ] );
+
+                       // Cut titles exceeding the TITLE_MAX_BYTES byte size limit
+                       // (size of underlying database field)
+                       if ( namespace !== NS_SPECIAL ) {
+                               title = trimToByteLength( title, TITLE_MAX_BYTES );
+                       }
+               }
+
+               // Any remaining initial :s are illegal.
+               title = title.replace( /^:+/, '' );
+
+               return Title.newFromText( title, namespace );
+       };
+
+       /**
+        * Sanitizes a file name as supplied by the user, originating in the user's file system
+        * so it is most likely a valid MediaWiki title and file name after processing.
+        * Returns null on fatal errors.
+        *
+        * @static
+        * @param {string} uncleanName The unclean file name including file extension but
+        *   without namespace
+        * @return {mw.Title|null} A valid Title object or null if the title is invalid
+        */
+       Title.newFromFileName = function ( uncleanName ) {
+
+               return Title.newFromUserInput( 'File:' + uncleanName, {
+                       forUploading: true
+               } );
+       };
+
+       /**
+        * Get the file title from an image element
+        *
+        *     var title = mw.Title.newFromImg( $( 'img:first' ) );
+        *
+        * @static
+        * @param {HTMLElement|jQuery} img The image to use as a base
+        * @return {mw.Title|null} The file title or null if unsuccessful
+        */
+       Title.newFromImg = function ( img ) {
+               var matches, i, regex, src, decodedSrc,
+
+                       // thumb.php-generated thumbnails
+                       thumbPhpRegex = /thumb\.php/,
+                       regexes = [
+                               // Thumbnails
+                               /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)\/[^\s/]+-[^\s/]*$/,
+
+                               // Full size images
+                               /\/[a-f0-9]\/[a-f0-9]{2}\/([^\s/]+)$/,
+
+                               // Thumbnails in non-hashed upload directories
+                               /\/([^\s/]+)\/[^\s/]+-(?:\1|thumbnail)[^\s/]*$/,
+
+                               // Full-size images in non-hashed upload directories
+                               /\/([^\s/]+)$/
+                       ],
+
+                       recount = regexes.length;
+
+               src = img.jquery ? img[ 0 ].src : img.src;
+
+               matches = src.match( thumbPhpRegex );
+
+               if ( matches ) {
+                       return mw.Title.newFromText( 'File:' + mw.util.getParamValue( 'f', src ) );
+               }
+
+               decodedSrc = decodeURIComponent( src );
+
+               for ( i = 0; i < recount; i++ ) {
+                       regex = regexes[ i ];
+                       matches = decodedSrc.match( regex );
+
+                       if ( matches && matches[ 1 ] ) {
+                               return mw.Title.newFromText( 'File:' + matches[ 1 ] );
+                       }
+               }
+
+               return null;
+       };
+
+       /**
+        * Whether this title exists on the wiki.
+        *
+        * @static
+        * @param {string|mw.Title} title prefixed db-key name (string) or instance of Title
+        * @return {boolean|null} Boolean if the information is available, otherwise null
+        */
+       Title.exists = function ( title ) {
+               var match,
+                       obj = Title.exist.pages;
+
+               if ( typeof title === 'string' ) {
+                       match = obj[ title ];
+               } else if ( title instanceof Title ) {
+                       match = obj[ title.toString() ];
+               } else {
+                       throw new Error( 'mw.Title.exists: title must be a string or an instance of Title' );
+               }
+
+               if ( typeof match !== 'boolean' ) {
+                       return null;
+               }
+
+               return match;
+       };
+
+       /**
+        * Store page existence
+        *
+        * @static
+        * @property {Object} exist
+        * @property {Object} exist.pages Keyed by title. Boolean true value indicates page does exist.
+        *
+        * @property {Function} exist.set The setter function.
+        *
+        *  Example to declare existing titles:
+        *
+        *     Title.exist.set( ['User:John_Doe', ...] );
+        *
+        *  Example to declare titles nonexistent:
+        *
+        *     Title.exist.set( ['File:Foo_bar.jpg', ...], false );
+        *
+        * @property {string|Array} exist.set.titles Title(s) in strict prefixedDb title form
+        * @property {boolean} [exist.set.state=true] State of the given titles
+        * @return {boolean}
+        */
+       Title.exist = {
+               pages: {},
+
+               set: function ( titles, state ) {
+                       var i, len,
+                               pages = this.pages;
+
+                       titles = Array.isArray( titles ) ? titles : [ titles ];
+                       state = state === undefined ? true : !!state;
+
+                       for ( i = 0, len = titles.length; i < len; i++ ) {
+                               pages[ titles[ i ] ] = state;
+                       }
+                       return true;
+               }
+       };
+
+       /**
+        * Normalize a file extension to the common form, making it lowercase and checking some synonyms,
+        * and ensure it's clean. Extensions with non-alphanumeric characters will be discarded.
+        * Keep in sync with File::normalizeExtension() in PHP.
+        *
+        * @param {string} extension File extension (without the leading dot)
+        * @return {string} File extension in canonical form
+        */
+       Title.normalizeExtension = function ( extension ) {
+               var
+                       lower = extension.toLowerCase(),
+                       squish = {
+                               htm: 'html',
+                               jpeg: 'jpg',
+                               mpeg: 'mpg',
+                               tiff: 'tif',
+                               ogv: 'ogg'
+                       };
+               if ( squish.hasOwnProperty( lower ) ) {
+                       return squish[ lower ];
+               } else if ( /^[0-9a-z]+$/.test( lower ) ) {
+                       return lower;
+               } else {
+                       return '';
+               }
+       };
+
+       /* Public members */
+
+       Title.prototype = {
+               constructor: Title,
+
+               /**
+                * Get the namespace number
+                *
+                * Example: 6 for "File:Example_image.svg".
+                *
+                * @return {number}
+                */
+               getNamespaceId: function () {
+                       return this.namespace;
+               },
+
+               /**
+                * Get the namespace prefix (in the content language)
+                *
+                * Example: "File:" for "File:Example_image.svg".
+                * In #NS_MAIN this is '', otherwise namespace name plus ':'
+                *
+                * @return {string}
+                */
+               getNamespacePrefix: function () {
+                       return getNamespacePrefix( this.namespace );
+               },
+
+               /**
+                * Get the page name without extension or namespace prefix
+                *
+                * Example: "Example_image" for "File:Example_image.svg".
+                *
+                * For the page title (full page name without namespace prefix), see #getMain.
+                *
+                * @return {string}
+                */
+               getName: function () {
+                       if (
+                               $.inArray( this.namespace, mw.config.get( 'wgCaseSensitiveNamespaces' ) ) !== -1 ||
+                               !this.title.length
+                       ) {
+                               return this.title;
+                       }
+                       // PHP's strtoupper differs from String.toUpperCase in a number of cases
+                       // Bug: T147646
+                       return mw.Title.phpCharToUpper( this.title[ 0 ] ) + this.title.slice( 1 );
+               },
+
+               /**
+                * Get the page name (transformed by #text)
+                *
+                * Example: "Example image" for "File:Example_image.svg".
+                *
+                * For the page title (full page name without namespace prefix), see #getMainText.
+                *
+                * @return {string}
+                */
+               getNameText: function () {
+                       return text( this.getName() );
+               },
+
+               /**
+                * Get the extension of the page name (if any)
+                *
+                * @return {string|null} Name extension or null if there is none
+                */
+               getExtension: function () {
+                       return this.ext;
+               },
+
+               /**
+                * Shortcut for appendable string to form the main page name.
+                *
+                * Returns a string like ".json", or "" if no extension.
+                *
+                * @return {string}
+                */
+               getDotExtension: function () {
+                       return this.ext === null ? '' : '.' + this.ext;
+               },
+
+               /**
+                * Get the main page name
+                *
+                * Example: "Example_image.svg" for "File:Example_image.svg".
+                *
+                * @return {string}
+                */
+               getMain: function () {
+                       return this.getName() + this.getDotExtension();
+               },
+
+               /**
+                * Get the main page name (transformed by #text)
+                *
+                * Example: "Example image.svg" for "File:Example_image.svg".
+                *
+                * @return {string}
+                */
+               getMainText: function () {
+                       return text( this.getMain() );
+               },
+
+               /**
+                * Get the full page name
+                *
+                * Example: "File:Example_image.svg".
+                * Most useful for API calls, anything that must identify the "title".
+                *
+                * @return {string}
+                */
+               getPrefixedDb: function () {
+                       return this.getNamespacePrefix() + this.getMain();
+               },
+
+               /**
+                * Get the full page name (transformed by #text)
+                *
+                * Example: "File:Example image.svg" for "File:Example_image.svg".
+                *
+                * @return {string}
+                */
+               getPrefixedText: function () {
+                       return text( this.getPrefixedDb() );
+               },
+
+               /**
+                * Get the page name relative to a namespace
+                *
+                * Example:
+                *
+                * - "Foo:Bar" relative to the Foo namespace becomes "Bar".
+                * - "Bar" relative to any non-main namespace becomes ":Bar".
+                * - "Foo:Bar" relative to any namespace other than Foo stays "Foo:Bar".
+                *
+                * @param {number} namespace The namespace to be relative to
+                * @return {string}
+                */
+               getRelativeText: function ( namespace ) {
+                       if ( this.getNamespaceId() === namespace ) {
+                               return this.getMainText();
+                       } else if ( this.getNamespaceId() === NS_MAIN ) {
+                               return ':' + this.getPrefixedText();
+                       } else {
+                               return this.getPrefixedText();
+                       }
+               },
+
+               /**
+                * Get the fragment (if any).
+                *
+                * Note that this method (by design) does not include the hash character and
+                * the value is not url encoded.
+                *
+                * @return {string|null}
+                */
+               getFragment: function () {
+                       return this.fragment;
+               },
+
+               /**
+                * Get the URL to this title
+                *
+                * @see mw.util#getUrl
+                * @param {Object} [params] A mapping of query parameter names to values,
+                *     e.g. `{ action: 'edit' }`.
+                * @return {string}
+                */
+               getUrl: function ( params ) {
+                       var fragment = this.getFragment();
+                       if ( fragment ) {
+                               return mw.util.getUrl( this.toString() + '#' + fragment, params );
+                       } else {
+                               return mw.util.getUrl( this.toString(), params );
+                       }
+               },
+
+               /**
+                * Whether this title exists on the wiki.
+                *
+                * @see #static-method-exists
+                * @return {boolean|null} Boolean if the information is available, otherwise null
+                */
+               exists: function () {
+                       return Title.exists( this );
+               }
+       };
+
+       /**
+        * @alias #getPrefixedDb
+        * @method
+        */
+       Title.prototype.toString = Title.prototype.getPrefixedDb;
+
+       /**
+        * @alias #getPrefixedText
+        * @method
+        */
+       Title.prototype.toText = Title.prototype.getPrefixedText;
+
+       // Expose
+       mw.Title = Title;
+
+}( mediaWiki, jQuery ) );