resources/mediawiki/mediawiki.util.js

   1 /**
   2  * Implements mediaWiki.util library
   3  */
   4 ( function ( $, mw ) {
   5         "use strict";
   6
   7         // Local cache and alias
   8         var util = {
   9
  10                 /**
  11                  * Initialisation
  12                  * (don't call before document ready)
  13                  */
  14                 init: function () {
  15                         var profile, $tocTitle, $tocToggleLink, hideTocCookie;
  16
  17                         /* Set up $.messageBox */
  18                         $.messageBoxNew( {
  19                                 id: 'mw-js-message',
  20                                 parent: '#content'
  21                         } );
  22
  23                         /* Set tooltipAccessKeyPrefix */
  24                         profile = $.client.profile();
  25
  26                         // Opera on any platform
  27                         if ( profile.name === 'opera' ) {
  28                                 util.tooltipAccessKeyPrefix = 'shift-esc-';
  29
  30                         // Chrome on any platform
  31                         } else if ( profile.name === 'chrome' ) {
  32
  33                                 util.tooltipAccessKeyPrefix = (
  34                                         profile.platform === 'mac'
  35                                                 // Chrome on Mac
  36                                                 ? 'ctrl-option-'
  37                                                 : profile.platform === 'win'
  38                                                         // Chrome on Windows
  39                                                         // (both alt- and alt-shift work, but alt-f triggers Chrome wrench menu
  40                                                         // which alt-shift-f does not)
  41                                                         ? 'alt-shift-'
  42                                                         // Chrome on other (Ubuntu?)
  43                                                         : 'alt-'
  44                                 );
  45
  46                         // Non-Windows Safari with webkit_version > 526
  47                         } else if ( profile.platform !== 'win'
  48                                 && profile.name === 'safari'
  49                                 && profile.layoutVersion > 526 ) {
  50                                 util.tooltipAccessKeyPrefix = 'ctrl-alt-';
  51
  52                         // Safari/Konqueror on any platform, or any browser on Mac
  53                         // (but not Safari on Windows)
  54                         } else if ( !( profile.platform === 'win' && profile.name === 'safari' )
  55                                                         && ( profile.name === 'safari'
  56                                                         || profile.platform === 'mac'
  57                                                         || profile.name === 'konqueror' ) ) {
  58                                 util.tooltipAccessKeyPrefix = 'ctrl-';
  59
  60                         // Firefox 2.x and later
  61                         } else if ( profile.name === 'firefox' && profile.versionBase > '1' ) {
  62                                 util.tooltipAccessKeyPrefix = 'alt-shift-';
  63                         }
  64
  65                         /* Fill $content var */
  66                         if ( $( '#bodyContent' ).length ) {
  67                                 // Vector, Monobook, Chick etc.
  68                                 util.$content = $( '#bodyContent' );
  69
  70                         } else if ( $( '#mw_contentholder' ).length ) {
  71                                 // Modern
  72                                 util.$content = $( '#mw_contentholder' );
  73
  74                         } else if ( $( '#article' ).length ) {
  75                                 // Standard, CologneBlue
  76                                 util.$content = $( '#article' );
  77
  78                         } else {
  79                                 // #content is present on almost all if not all skins. Most skins (the above cases)
  80                                 // have #content too, but as an outer wrapper instead of the article text container.
  81                                 // The skins that don't have an outer wrapper do have #content for everything
  82                                 // so it's a good fallback
  83                                 util.$content = $( '#content' );
  84                         }
  85
  86                         // Table of contents toggle
  87                         $tocTitle = $( '#toctitle' );
  88                         $tocToggleLink = $( '#togglelink' );
  89                         // Only add it if there is a TOC and there is no toggle added already
  90                         if ( $( '#toc' ).length && $tocTitle.length && !$tocToggleLink.length ) {
  91                                 hideTocCookie = $.cookie( 'mw_hidetoc' );
  92                                         $tocToggleLink = $( '<a href="#" class="internal" id="togglelink"></a>' )
  93                                                 .text( mw.msg( 'hidetoc' ) )
  94                                                 .click( function ( e ) {
  95                                                         e.preventDefault();
  96                                                         util.toggleToc( $(this) );
  97                                                 } );
  98                                 $tocTitle.append(
  99                                         $tocToggleLink
 100                                                 .wrap( '<span class="toctoggle"></span>' )
 101                                                 .parent()
 102                                                         .prepend( '&nbsp;[' )
 103                                                         .append( ']&nbsp;' )
 104                                 );
 105
 106                                 if ( hideTocCookie === '1' ) {
 107                                         util.toggleToc( $tocToggleLink );
 108                                 }
 109                         }
 110                 },
 111
 112                 /* Main body */
 113
 114                 /**
 115                  * Encode the string like PHP's rawurlencode
 116                  *
 117                  * @param str string String to be encoded
 118                  */
 119                 rawurlencode: function ( str ) {
 120                         str = String( str );
 121                         return encodeURIComponent( str )
 122                                 .replace( /!/g, '%21' ).replace( /'/g, '%27' ).replace( /\(/g, '%28' )
 123                                 .replace( /\)/g, '%29' ).replace( /\*/g, '%2A' ).replace( /~/g, '%7E' );
 124                 },
 125
 126                 /**
 127                  * Encode page titles for use in a URL
 128                  * We want / and : to be included as literal characters in our title URLs
 129                  * as they otherwise fatally break the title
 130                  *
 131                  * @param str string String to be encoded
 132                  */
 133                 wikiUrlencode: function ( str ) {
 134                         return util.rawurlencode( str )
 135                                 .replace( /%20/g, '_' ).replace( /%3A/g, ':' ).replace( /%2F/g, '/' );
 136                 },
 137
 138                 /**
 139                  * Get the link to a page name (relative to wgServer)
 140                  *
 141                  * @param str String: Page name to get the link for.
 142                  * @return String: Location for a page with name of 'str' or boolean false on error.
 143                  */
 144                 wikiGetlink: function ( str ) {
 145                         return mw.config.get( 'wgArticlePath' ).replace( '$1',
 146                                 util.wikiUrlencode( typeof str === 'string' ? str : mw.config.get( 'wgPageName' ) ) );
 147                 },
 148
 149                 /**
 150                  * Get address to a script in the wiki root.
 151                  * For index.php use mw.config.get( 'wgScript' )
 152                  *
 153                  * @since 1.18
 154                  * @param str string Name of script (eg. 'api'), defaults to 'index'
 155                  * @return string Address to script (eg. '/w/api.php' )
 156                  */
 157                 wikiScript: function ( str ) {
 158                         return mw.config.get( 'wgScriptPath' ) + '/' + ( str || 'index' ) +
 159                                 mw.config.get( 'wgScriptExtension' );
 160                 },
 161
 162                 /**
 163                  * Append a new style block to the head and return the CSSStyleSheet object.
 164                  * Use .ownerNode to access the <style> element, or use mw.loader.addStyleTag.
 165                  * This function returns the styleSheet object for convience (due to cross-browsers
 166                  * difference as to where it is located).
 167                  * @example
 168                  * <code>
 169                  * var sheet = mw.util.addCSS('.foobar { display: none; }');
 170                  * $(foo).click(function () {
 171                  *     // Toggle the sheet on and off
 172                  *     sheet.disabled = !sheet.disabled;
 173                  * });
 174                  * </code>
 175                  *
 176                  * @param text string CSS to be appended
 177                  * @return CSSStyleSheet (use .ownerNode to get to the <style> element)
 178                  */
 179                 addCSS: function ( text ) {
 180                         var s = mw.loader.addStyleTag( text );
 181                         return s.sheet || s;
 182                 },
 183
 184                 /**
 185                  * Hide/show the table of contents element
 186                  *
 187                  * @param $toggleLink jQuery A jQuery object of the toggle link.
 188                  * @param callback function Function to be called after the toggle is
 189                  * completed (including the animation) (optional)
 190                  * @return mixed Boolean visibility of the toc (true if it's visible)
 191                  * or Null if there was no table of contents.
 192                  */
 193                 toggleToc: function ( $toggleLink, callback ) {
 194                         var $tocList = $( '#toc ul:first' );
 195
 196                         // This function shouldn't be called if there's no TOC,
 197                         // but just in case...
 198                         if ( $tocList.length ) {
 199                                 if ( $tocList.is( ':hidden' ) ) {
 200                                         $tocList.slideDown( 'fast', callback );
 201                                         $toggleLink.text( mw.msg( 'hidetoc' ) );
 202                                         $( '#toc' ).removeClass( 'tochidden' );
 203                                         $.cookie( 'mw_hidetoc', null, {
 204                                                 expires: 30,
 205                                                 path: '/'
 206                                         } );
 207                                         return true;
 208                                 } else {
 209                                         $tocList.slideUp( 'fast', callback );
 210                                         $toggleLink.text( mw.msg( 'showtoc' ) );
 211                                         $( '#toc' ).addClass( 'tochidden' );
 212                                         $.cookie( 'mw_hidetoc', '1', {
 213                                                 expires: 30,
 214                                                 path: '/'
 215                                         } );
 216                                         return false;
 217                                 }
 218                         } else {
 219                                 return null;
 220                         }
 221                 },
 222
 223                 /**
 224                  * Grab the URL parameter value for the given parameter.
 225                  * Returns null if not found.
 226                  *
 227                  * @param param string The parameter name.
 228                  * @param url string URL to search through (optional)
 229                  * @return mixed Parameter value or null.
 230                  */
 231                 getParamValue: function ( param, url ) {
 232                         url = url || document.location.href;
 233                         // Get last match, stop at hash
 234                         var     re = new RegExp( '^[^#]*[&?]' + $.escapeRE( param ) + '=([^&#]*)' ),
 235                                 m = re.exec( url );
 236                         if ( m ) {
 237                                 // Beware that decodeURIComponent is not required to understand '+'
 238                                 // by spec, as encodeURIComponent does not produce it.
 239                                 return decodeURIComponent( m[1].replace( /\+/g, '%20' ) );
 240                         }
 241                         return null;
 242                 },
 243
 244                 /**
 245                  * @var string
 246                  * Access key prefix. Will be re-defined based on browser/operating system
 247                  * detection in mw.util.init().
 248                  */
 249                 tooltipAccessKeyPrefix: 'alt-',
 250
 251                 /**
 252                  * @var RegExp
 253                  * Regex to match accesskey tooltips.
 254                  */
 255                 tooltipAccessKeyRegexp: /\[(ctrl-)?(alt-)?(shift-)?(esc-)?(.)\]$/,
 256
 257                 /**
 258                  * Add the appropriate prefix to the accesskey shown in the tooltip.
 259                  * If the nodeList parameter is given, only those nodes are updated;
 260                  * otherwise, all the nodes that will probably have accesskeys by
 261                  * default are updated.
 262                  *
 263                  * @param $nodes {Array|jQuery} [optional] A jQuery object, or array
 264                  * of elements to update.
 265                  */
 266                 updateTooltipAccessKeys: function ( $nodes ) {
 267                         if ( !$nodes ) {
 268                                 // Rather than going into a loop of all anchor tags, limit to few elements that
 269                                 // contain the relevant anchor tags.
 270                                 // Input and label are rare enough that no such optimization is needed
 271                                 $nodes = $( '#column-one a, #mw-head a, #mw-panel a, #p-logo a, input, label' );
 272                         } else if ( !( $nodes instanceof $ ) ) {
 273                                 $nodes = $( $nodes );
 274                         }
 275
 276                         $nodes.attr( 'title', function ( i, val ) {
 277                                 if ( val && util.tooltipAccessKeyRegexp.exec( val ) ) {
 278                                         return val.replace( util.tooltipAccessKeyRegexp,
 279                                                 '[' + util.tooltipAccessKeyPrefix + '$5]' );
 280                                 }
 281                                 return val;
 282                         } );
 283                 },
 284
 285                 /*
 286                  * @var jQuery
 287                  * A jQuery object that refers to the page-content element
 288                  * Populated by init().
 289                  */
 290                 $content: null,
 291
 292                 /**
 293                  * Add a link to a portlet menu on the page, such as:
 294                  *
 295                  * p-cactions (Content actions), p-personal (Personal tools),
 296                  * p-navigation (Navigation), p-tb (Toolbox)
 297                  *
 298                  * The first three paramters are required, the others are optional and
 299                  * may be null. Though providing an id and tooltip is recommended.
 300                  *
 301                  * By default the new link will be added to the end of the list. To
 302                  * add the link before a given existing item, pass the DOM node
 303                  * (document.getElementById( 'foobar' )) or the jQuery-selector
 304                  * ( '#foobar' ) of that item.
 305                  *
 306                  * @example mw.util.addPortletLink(
 307                  *       'p-tb', 'http://mediawiki.org/',
 308                  *       'MediaWiki.org', 't-mworg', 'Go to MediaWiki.org ', 'm', '#t-print'
 309                  * )
 310                  *
 311                  * @param portlet string ID of the target portlet ( 'p-cactions' or 'p-personal' etc.)
 312                  * @param href string Link URL
 313                  * @param text string Link text
 314                  * @param id string ID of the new item, should be unique and preferably have
 315                  * the appropriate prefix ( 'ca-', 'pt-', 'n-' or 't-' )
 316                  * @param tooltip string Text to show when hovering over the link, without accesskey suffix
 317                  * @param accesskey string Access key to activate this link (one character, try
 318                  * to avoid conflicts. Use $( '[accesskey=x]' ).get() in the console to
 319                  * see if 'x' is already used.
 320                  * @param nextnode mixed DOM Node or jQuery-selector string of the item that the new
 321                  * item should be added before, should be another item in the same
 322                  * list, it will be ignored otherwise
 323                  *
 324                  * @return mixed The DOM Node of the added item (a ListItem or Anchor element,
 325                  * depending on the skin) or null if no element was added to the document.
 326                  */
 327                 addPortletLink: function ( portlet, href, text, id, tooltip, accesskey, nextnode ) {
 328                         var $item, $link, $portlet, $ul;
 329
 330                         // Check if there's atleast 3 arguments to prevent a TypeError
 331                         if ( arguments.length < 3 ) {
 332                                 return null;
 333                         }
 334                         // Setup the anchor tag
 335                         $link = $( '<a>' ).attr( 'href', href ).text( text );
 336                         if ( tooltip ) {
 337                                 $link.attr( 'title', tooltip );
 338                         }
 339
 340                         // Some skins don't have any portlets
 341                         // just add it to the bottom of their 'sidebar' element as a fallback
 342                         switch ( mw.config.get( 'skin' ) ) {
 343                         case 'standard':
 344                         case 'cologneblue':
 345                                 $( '#quickbar' ).append( $link.after( '<br/>' ) );
 346                                 return $link[0];
 347                         case 'nostalgia':
 348                                 $( '#searchform' ).before( $link ).before( ' &#124; ' );
 349                                 return $link[0];
 350                         default: // Skins like chick, modern, monobook, myskin, simple, vector...
 351
 352                                 // Select the specified portlet
 353                                 $portlet = $( '#' + portlet );
 354                                 if ( $portlet.length === 0 ) {
 355                                         return null;
 356                                 }
 357                                 // Select the first (most likely only) unordered list inside the portlet
 358                                 $ul = $portlet.find( 'ul' );
 359
 360                                 // If it didn't have an unordered list yet, create it
 361                                 if ( $ul.length === 0 ) {
 362                                         // If there's no <div> inside, append it to the portlet directly
 363                                         if ( $portlet.find( 'div:first' ).length === 0 ) {
 364                                                 $portlet.append( '<ul></ul>' );
 365                                         } else {
 366                                                 // otherwise if there's a div (such as div.body or div.pBody)
 367                                                 // append the <ul> to last (most likely only) div
 368                                                 $portlet.find( 'div' ).eq( -1 ).append( '<ul></ul>' );
 369                                         }
 370                                         // Select the created element
 371                                         $ul = $portlet.find( 'ul' ).eq( 0 );
 372                                 }
 373                                 // Just in case..
 374                                 if ( $ul.length === 0 ) {
 375                                         return null;
 376                                 }
 377
 378                                 // Unhide portlet if it was hidden before
 379                                 $portlet.removeClass( 'emptyPortlet' );
 380
 381                                 // Wrap the anchor tag in a list item (and a span if $portlet is a Vector tab)
 382                                 // and back up the selector to the list item
 383                                 if ( $portlet.hasClass( 'vectorTabs' ) ) {
 384                                         $item = $link.wrap( '<li><span></span></li>' ).parent().parent();
 385                                 } else {
 386                                         $item = $link.wrap( '<li></li>' ).parent();
 387                                 }
 388
 389                                 // Implement the properties passed to the function
 390                                 if ( id ) {
 391                                         $item.attr( 'id', id );
 392                                 }
 393                                 if ( accesskey ) {
 394                                         $link.attr( 'accesskey', accesskey );
 395                                         tooltip += ' [' + accesskey + ']';
 396                                         $link.attr( 'title', tooltip );
 397                                 }
 398                                 if ( accesskey && tooltip ) {
 399                                         util.updateTooltipAccessKeys( $link );
 400                                 }
 401
 402                                 // Where to put our node ?
 403                                 // - nextnode is a DOM element (was the only option before MW 1.17, in wikibits.js)
 404                                 if ( nextnode && nextnode.parentNode === $ul[0] ) {
 405                                         $(nextnode).before( $item );
 406
 407                                 // - nextnode is a CSS selector for jQuery
 408                                 } else if ( typeof nextnode === 'string' && $ul.find( nextnode ).length !== 0 ) {
 409                                         $ul.find( nextnode ).eq( 0 ).before( $item );
 410
 411                                 // If the jQuery selector isn't found within the <ul>,
 412                                 // or if nextnode was invalid or not passed at all,
 413                                 // then just append it at the end of the <ul> (this is the default behaviour)
 414                                 } else {
 415                                         $ul.append( $item );
 416                                 }
 417
 418
 419                                 return $item[0];
 420                         }
 421                 },
 422
 423                 /**
 424                  * Add a little box at the top of the screen to inform the user of
 425                  * something, replacing any previous message.
 426                  * Calling with no arguments, with an empty string or null will hide the message
 427                  *
 428                  * @param message {mixed} The DOM-element, jQuery object or HTML-string to be put inside the message box.
 429                  * @param className {String} Used in adding a class; should be different for each call
 430                  * to allow CSS/JS to hide different boxes. null = no class used.
 431                  * @return {Boolean} True on success, false on failure.
 432                  */
 433                 jsMessage: function ( message, className ) {
 434                         if ( !arguments.length || message === '' || message === null ) {
 435                                 $( '#mw-js-message' ).empty().hide();
 436                                 return true; // Emptying and hiding message is intended behaviour, return true
 437
 438                         } else {
 439                                 // We special-case skin structures provided by the software. Skins that
 440                                 // choose to abandon or significantly modify our formatting can just define
 441                                 // an mw-js-message div to start with.
 442                                 var $messageDiv = $( '#mw-js-message' );
 443                                 if ( !$messageDiv.length ) {
 444                                         $messageDiv = $( '<div id="mw-js-message"></div>' );
 445                                         if ( util.$content.parent().length ) {
 446                                                 util.$content.parent().prepend( $messageDiv );
 447                                         } else {
 448                                                 return false;
 449                                         }
 450                                 }
 451
 452                                 if ( className ) {
 453                                         $messageDiv.prop( 'class', 'mw-js-message-' + className );
 454                                 }
 455
 456                                 if ( typeof message === 'object' ) {
 457                                         $messageDiv.empty();
 458                                         $messageDiv.append( message );
 459                                 } else {
 460                                         $messageDiv.html( message );
 461                                 }
 462
 463                                 $messageDiv.slideDown();
 464                                 return true;
 465                         }
 466                 },
 467
 468                 /**
 469                  * Validate a string as representing a valid e-mail address
 470                  * according to HTML5 specification. Please note the specification
 471                  * does not validate a domain with one character.
 472                  *
 473                  * @todo FIXME: should be moved to or replaced by a JavaScript validation module.
 474                  *
 475                  * @param mailtxt string E-mail address to be validated.
 476                  * @return mixed Null if mailtxt was an empty string, otherwise true/false
 477                  * is determined by validation.
 478                  */
 479                 validateEmail: function ( mailtxt ) {
 480                         var rfc5322_atext, rfc1034_ldh_str, HTML5_email_regexp;
 481
 482                         if ( mailtxt === '' ) {
 483                                 return null;
 484                         }
 485
 486                         /**
 487                          * HTML5 defines a string as valid e-mail address if it matches
 488                          * the ABNF:
 489                          *      1 * ( atext / "." ) "@" ldh-str 1*( "." ldh-str )
 490                          * With:
 491                          * - atext      : defined in RFC 5322 section 3.2.3
 492                          * - ldh-str : defined in RFC 1034 section 3.5
 493                          *
 494                          * (see STD 68 / RFC 5234 http://tools.ietf.org/html/std68):
 495                          */
 496
 497                         /**
 498                          * First, define the RFC 5322 'atext' which is pretty easy:
 499                          * atext = ALPHA / DIGIT / ; Printable US-ASCII
 500                                                  "!" / "#" /     ; characters not including
 501                                                  "$" / "%" /     ; specials. Used for atoms.
 502                                                  "&" / "'" /
 503                                                  "*" / "+" /
 504                                                  "-" / "/" /
 505                                                  "=" / "?" /
 506                                                  "^" / "_" /
 507                                                  "`" / "{" /
 508                                                  "|" / "}" /
 509                                                  "~"
 510                         */
 511                         rfc5322_atext = "a-z0-9!#$%&'*+\\-/=?^_`{|}~";
 512
 513                         /**
 514                          * Next define the RFC 1034 'ldh-str'
 515                          *      <domain> ::= <subdomain> | " "
 516                          *      <subdomain> ::= <label> | <subdomain> "." <label>
 517                          *      <label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]
 518                          *      <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
 519                          *      <let-dig-hyp> ::= <let-dig> | "-"
 520                          *      <let-dig> ::= <letter> | <digit>
 521                          */
 522                         rfc1034_ldh_str = "a-z0-9\\-";
 523
 524                         HTML5_email_regexp = new RegExp(
 525                                 // start of string
 526                                 '^'
 527                                 +
 528                                 // User part which is liberal :p
 529                                 '[' + rfc5322_atext + '\\.]+'
 530                                 +
 531                                 // 'at'
 532                                 '@'
 533                                 +
 534                                 // Domain first part
 535                                 '[' + rfc1034_ldh_str + ']+'
 536                                 +
 537                                 // Optional second part and following are separated by a dot
 538                                 '(?:\\.[' + rfc1034_ldh_str + ']+)*'
 539                                 +
 540                                 // End of string
 541                                 '$',
 542                                 // RegExp is case insensitive
 543                                 'i'
 544                         );
 545                         return (null !== mailtxt.match( HTML5_email_regexp ) );
 546                 },
 547
 548                 /**
 549                  * Note: borrows from IP::isIPv4
 550                  *
 551                  * @param address string
 552                  * @param allowBlock boolean
 553                  * @return boolean
 554                  */
 555                 isIPv4Address: function ( address, allowBlock ) {
 556                         if ( typeof address !== 'string' ) {
 557                                 return false;
 558                         }
 559
 560                         var     block = allowBlock ? '(?:\\/(?:3[0-2]|[12]?\\d))?' : '',
 561                                 RE_IP_BYTE = '(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|0?[0-9]?[0-9])',
 562                                 RE_IP_ADD = '(?:' + RE_IP_BYTE + '\\.){3}' + RE_IP_BYTE;
 563
 564                         return address.search( new RegExp( '^' + RE_IP_ADD + block + '$' ) ) !== -1;
 565                 },
 566
 567                 /**
 568                  * Note: borrows from IP::isIPv6
 569                  *
 570                  * @param address string
 571                  * @param allowBlock boolean
 572                  * @return boolean
 573                  */
 574                 isIPv6Address: function ( address, allowBlock ) {
 575                         if ( typeof address !== 'string' ) {
 576                                 return false;
 577                         }
 578
 579                         var     block = allowBlock ? '(?:\\/(?:12[0-8]|1[01][0-9]|[1-9]?\\d))?' : '',
 580                                 RE_IPV6_ADD =
 581                         '(?:' + // starts with "::" (including "::")
 582                         ':(?::|(?::' + '[0-9A-Fa-f]{1,4}' + '){1,7})' +
 583                         '|' + // ends with "::" (except "::")
 584                         '[0-9A-Fa-f]{1,4}' + '(?::' + '[0-9A-Fa-f]{1,4}' + '){0,6}::' +
 585                         '|' + // contains no "::"
 586                         '[0-9A-Fa-f]{1,4}' + '(?::' + '[0-9A-Fa-f]{1,4}' + '){7}' +
 587                         ')';
 588
 589                         if ( address.search( new RegExp( '^' + RE_IPV6_ADD + block + '$' ) ) !== -1 ) {
 590                                 return true;
 591                         }
 592
 593                         RE_IPV6_ADD = // contains one "::" in the middle (single '::' check below)
 594                                 '[0-9A-Fa-f]{1,4}' + '(?:::?' + '[0-9A-Fa-f]{1,4}' + '){1,6}';
 595
 596                         return address.search( new RegExp( '^' + RE_IPV6_ADD + block + '$' ) ) !== -1
 597                                 && address.search( /::/ ) !== -1 && address.search( /::.*::/ ) === -1;
 598                 }
 599         };
 600
 601         mw.util = util;
 602
 603 } )( jQuery, mediaWiki );