_source/core/tools.js

   1 /*\r
   2 Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.\r
   3 For licensing, see LICENSE.html or http://ckeditor.com/license\r
   4 */\r
   5 \r
   6 /**\r
   7  * @fileOverview Defines the {@link CKEDITOR.tools} object, which contains\r
   8  *              utility functions.\r
   9  */\r
  10 \r
  11 (function()\r
  12 {\r
  13         var functions = [];\r
  14 \r
  15         /**\r
  16          * Utility functions.\r
  17          * @namespace\r
  18          * @example\r
  19          */\r
  20         CKEDITOR.tools =\r
  21         {\r
  22                 /**\r
  23                  * Compare the elements of two arrays.\r
  24                  * @param {Array} arrayA An array to be compared.\r
  25                  * @param {Array} arrayB The other array to be compared.\r
  26                  * @returns {Boolean} "true" is the arrays have the same lenght and\r
  27                  *              their elements match.\r
  28                  * @example\r
  29                  * var a = [ 1, 'a', 3 ];\r
  30                  * var b = [ 1, 3, 'a' ];\r
  31                  * var c = [ 1, 'a', 3 ];\r
  32                  * var d = [ 1, 'a', 3, 4 ];\r
  33                  *\r
  34                  * alert( CKEDITOR.tools.arrayCompare( a, b ) );  // false\r
  35                  * alert( CKEDITOR.tools.arrayCompare( a, c ) );  // true\r
  36                  * alert( CKEDITOR.tools.arrayCompare( a, d ) );  // false\r
  37                  */\r
  38                 arrayCompare : function( arrayA, arrayB )\r
  39                 {\r
  40                         if ( !arrayA && !arrayB )\r
  41                                 return true;\r
  42 \r
  43                         if ( !arrayA || !arrayB || arrayA.length != arrayB.length )\r
  44                                 return false;\r
  45 \r
  46                         for ( var i = 0 ; i < arrayA.length ; i++ )\r
  47                         {\r
  48                                 if ( arrayA[ i ] != arrayB[ i ] )\r
  49                                         return false;\r
  50                         }\r
  51 \r
  52                         return true;\r
  53                 },\r
  54 \r
  55                 /**\r
  56                  * Creates a deep copy of an object.\r
  57                  * Attention: there is no support for recursive references.\r
  58                  * @param {Object} object The object to be cloned.\r
  59                  * @returns {Object} The object clone.\r
  60                  * @example\r
  61                  * var obj =\r
  62                  *     {\r
  63                  *         name : 'John',\r
  64                  *         cars :\r
  65                  *             {\r
  66                  *                 Mercedes : { color : 'blue' },\r
  67                  *                 Porsche : { color : 'red' }\r
  68                  *             }\r
  69                  *     };\r
  70                  * var clone = CKEDITOR.tools.clone( obj );\r
  71                  * clone.name = 'Paul';\r
  72                  * clone.cars.Porsche.color = 'silver';\r
  73                  * alert( obj.name );   // John\r
  74                  * alert( clone.name ); // Paul\r
  75                  * alert( obj.cars.Porsche.color );     // red\r
  76                  * alert( clone.cars.Porsche.color );   // silver\r
  77                  */\r
  78                 clone : function( obj )\r
  79                 {\r
  80                         var clone;\r
  81 \r
  82                         // Array.\r
  83                         if ( obj && ( obj instanceof Array ) )\r
  84                         {\r
  85                                 clone = [];\r
  86 \r
  87                                 for ( var i = 0 ; i < obj.length ; i++ )\r
  88                                         clone[ i ] = this.clone( obj[ i ] );\r
  89 \r
  90                                 return clone;\r
  91                         }\r
  92 \r
  93                         // "Static" types.\r
  94                         if ( obj === null\r
  95                                 || ( typeof( obj ) != 'object' )\r
  96                                 || ( obj instanceof String )\r
  97                                 || ( obj instanceof Number )\r
  98                                 || ( obj instanceof Boolean )\r
  99                                 || ( obj instanceof Date )\r
 100                                 || ( obj instanceof RegExp) )\r
 101                         {\r
 102                                 return obj;\r
 103                         }\r
 104 \r
 105                         // Objects.\r
 106                         clone = new obj.constructor();\r
 107 \r
 108                         for ( var propertyName in obj )\r
 109                         {\r
 110                                 var property = obj[ propertyName ];\r
 111                                 clone[ propertyName ] = this.clone( property );\r
 112                         }\r
 113 \r
 114                         return clone;\r
 115                 },\r
 116 \r
 117                 /**\r
 118                  * Turn the first letter of string to upper-case.\r
 119                  * @param {String} str\r
 120                  */\r
 121                 capitalize: function( str )\r
 122                 {\r
 123                         return str.charAt( 0 ).toUpperCase() + str.substring( 1 ).toLowerCase();\r
 124                 },\r
 125 \r
 126                 /**\r
 127                  * Copy the properties from one object to another. By default, properties\r
 128                  * already present in the target object <strong>are not</strong> overwritten.\r
 129                  * @param {Object} target The object to be extended.\r
 130                  * @param {Object} source[,souce(n)] The objects from which copy\r
 131                  *              properties. Any number of objects can be passed to this function.\r
 132                  * @param {Boolean} [overwrite] If 'true' is specified it indicates that\r
 133                  *            properties already present in the target object could be\r
 134                  *            overwritten by subsequent objects.\r
 135                  * @param {Object} [properties] Only properties within the specified names\r
 136                  *            list will be received from the source object.\r
 137                  * @returns {Object} the extended object (target).\r
 138                  * @example\r
 139                  * // Create the sample object.\r
 140                  * var myObject =\r
 141                  * {\r
 142                  *     prop1 : true\r
 143                  * };\r
 144                  *\r
 145                  * // Extend the above object with two properties.\r
 146                  * CKEDITOR.tools.extend( myObject,\r
 147                  *     {\r
 148                  *         prop2 : true,\r
 149                  *         prop3 : true\r
 150                  *     } );\r
 151                  *\r
 152                  * // Alert "prop1", "prop2" and "prop3".\r
 153                  * for ( var p in myObject )\r
 154                  *     alert( p );\r
 155                  */\r
 156                 extend : function( target )\r
 157                 {\r
 158                         var argsLength = arguments.length,\r
 159                                 overwrite, propertiesList;\r
 160 \r
 161                         if ( typeof ( overwrite = arguments[ argsLength - 1 ] ) == 'boolean')\r
 162                                 argsLength--;\r
 163                         else if ( typeof ( overwrite = arguments[ argsLength - 2 ] ) == 'boolean' )\r
 164                         {\r
 165                                 propertiesList = arguments [ argsLength -1 ];\r
 166                                 argsLength-=2;\r
 167                         }\r
 168                         for ( var i = 1 ; i < argsLength ; i++ )\r
 169                         {\r
 170                                 var source = arguments[ i ];\r
 171                                 for ( var propertyName in source )\r
 172                                 {\r
 173                                         // Only copy existed fields if in overwrite mode.\r
 174                                         if ( overwrite === true || target[ propertyName ] == undefined )\r
 175                                         {\r
 176                                                 // Only copy  specified fields if list is provided.\r
 177                                                 if ( !propertiesList || ( propertyName in propertiesList ) )\r
 178                                                         target[ propertyName ] = source[ propertyName ];\r
 179 \r
 180                                         }\r
 181                                 }\r
 182                         }\r
 183 \r
 184                         return target;\r
 185                 },\r
 186 \r
 187                 /**\r
 188                  * Creates an object which is an instance of a class which prototype is a\r
 189                  * predefined object. All properties defined in the source object are\r
 190                  * automatically inherited by the resulting object, including future\r
 191                  * changes to it.\r
 192                  * @param {Object} source The source object to be used as the prototype for\r
 193                  *              the final object.\r
 194                  * @returns {Object} The resulting copy.\r
 195                  */\r
 196                 prototypedCopy : function( source )\r
 197                 {\r
 198                         var copy = function()\r
 199                         {};\r
 200                         copy.prototype = source;\r
 201                         return new copy();\r
 202                 },\r
 203 \r
 204                 /**\r
 205                  * Checks if an object is an Array.\r
 206                  * @param {Object} object The object to be checked.\r
 207                  * @type Boolean\r
 208                  * @returns <i>true</i> if the object is an Array, otherwise <i>false</i>.\r
 209                  * @example\r
 210                  * alert( CKEDITOR.tools.isArray( [] ) );      // "true"\r
 211                  * alert( CKEDITOR.tools.isArray( 'Test' ) );  // "false"\r
 212                  */\r
 213                 isArray : function( object )\r
 214                 {\r
 215                         return ( !!object && object instanceof Array );\r
 216                 },\r
 217 \r
 218                 isEmpty : function ( object )\r
 219                 {\r
 220                         for ( var i in object )\r
 221                         {\r
 222                                 if ( object.hasOwnProperty( i ) )\r
 223                                         return false;\r
 224                         }\r
 225                         return true;\r
 226                 },\r
 227                 /**\r
 228                  * Transforms a CSS property name to its relative DOM style name.\r
 229                  * @param {String} cssName The CSS property name.\r
 230                  * @returns {String} The transformed name.\r
 231                  * @example\r
 232                  * alert( CKEDITOR.tools.cssStyleToDomStyle( 'background-color' ) );  // "backgroundColor"\r
 233                  * alert( CKEDITOR.tools.cssStyleToDomStyle( 'float' ) );             // "cssFloat"\r
 234                  */\r
 235                 cssStyleToDomStyle : ( function()\r
 236                 {\r
 237                         var test = document.createElement( 'div' ).style;\r
 238 \r
 239                         var cssFloat = ( typeof test.cssFloat != 'undefined' ) ? 'cssFloat'\r
 240                                 : ( typeof test.styleFloat != 'undefined' ) ? 'styleFloat'\r
 241                                 : 'float';\r
 242 \r
 243                         return function( cssName )\r
 244                         {\r
 245                                 if ( cssName == 'float' )\r
 246                                         return cssFloat;\r
 247                                 else\r
 248                                 {\r
 249                                         return cssName.replace( /-./g, function( match )\r
 250                                                 {\r
 251                                                         return match.substr( 1 ).toUpperCase();\r
 252                                                 });\r
 253                                 }\r
 254                         };\r
 255                 } )(),\r
 256 \r
 257                 /**\r
 258                  * Build the HTML snippet of a set of <style>/<link>.\r
 259                  * @param css {String|Array} Each of which are url (absolute) of a CSS file or\r
 260                  * a trunk of style text.\r
 261                  */\r
 262                 buildStyleHtml : function ( css )\r
 263                 {\r
 264                         css = [].concat( css );\r
 265                         var item, retval = [];\r
 266                         for ( var i = 0; i < css.length; i++ )\r
 267                         {\r
 268                                 item = css[ i ];\r
 269                                 // Is CSS style text ?\r
 270                                 if ( /@import|[{}]/.test(item) )\r
 271                                         retval.push('<style>' + item + '</style>');\r
 272                                 else\r
 273                                         retval.push('<link type="text/css" rel=stylesheet href="' + item + '">');\r
 274                         }\r
 275                         return retval.join( '' );\r
 276                 },\r
 277 \r
 278                 /**\r
 279                  * Replace special HTML characters in a string with their relative HTML\r
 280                  * entity values.\r
 281                  * @param {String} text The string to be encoded.\r
 282                  * @returns {String} The encode string.\r
 283                  * @example\r
 284                  * alert( CKEDITOR.tools.htmlEncode( 'A > B & C < D' ) );  // "A &amp;gt; B &amp;amp; C &amp;lt; D"\r
 285                  */\r
 286                 htmlEncode : function( text )\r
 287                 {\r
 288                         var standard = function( text )\r
 289                         {\r
 290                                 var span = new CKEDITOR.dom.element( 'span' );\r
 291                                 span.setText( text );\r
 292                                 return span.getHtml();\r
 293                         };\r
 294 \r
 295                         var fix1 = ( standard( '\n' ).toLowerCase() == '<br>' ) ?\r
 296                                 function( text )\r
 297                                 {\r
 298                                         // #3874 IE and Safari encode line-break into <br>\r
 299                                         return standard( text ).replace( /<br>/gi, '\n' );\r
 300                                 } :\r
 301                                 standard;\r
 302 \r
 303                         var fix2 = ( standard( '>' ) == '>' ) ?\r
 304                                 function( text )\r
 305                                 {\r
 306                                         // WebKit does't encode the ">" character, which makes sense, but\r
 307                                         // it's different than other browsers.\r
 308                                         return fix1( text ).replace( />/g, '&gt;' );\r
 309                                 } :\r
 310                                 fix1;\r
 311 \r
 312                         var fix3 = ( standard( '  ' ) == '&nbsp; ' ) ?\r
 313                                 function( text )\r
 314                                 {\r
 315                                         // #3785 IE8 changes spaces (>= 2) to &nbsp;\r
 316                                         return fix2( text ).replace( /&nbsp;/g, ' ' );\r
 317                                 } :\r
 318                                 fix2;\r
 319 \r
 320                         this.htmlEncode = fix3;\r
 321 \r
 322                         return this.htmlEncode( text );\r
 323                 },\r
 324 \r
 325                 /**\r
 326                  * Replace special HTML characters in HTMLElement's attribute with their relative HTML entity values.\r
 327                  * @param {String} The attribute's value to be encoded.\r
 328                  * @returns {String} The encode value.\r
 329                  * @example\r
 330                  * element.setAttribute( 'title', '<a " b >' );\r
 331                  * alert( CKEDITOR.tools.htmlEncodeAttr( element.getAttribute( 'title' ) );  // "&gt;a &quot; b &lt;"\r
 332                  */\r
 333                 htmlEncodeAttr : function( text )\r
 334                 {\r
 335                         return text.replace( /"/g, '&quot;' ).replace( /</g, '&lt;' ).replace( />/, '&gt;' );\r
 336                 },\r
 337 \r
 338                 /**\r
 339                  * Replace characters can't be represented through CSS Selectors string\r
 340                  * by CSS Escape Notation where the character escape sequence consists\r
 341                  * of a backslash character (\) followed by the orginal characters.\r
 342                  * Ref: http://www.w3.org/TR/css3-selectors/#grammar\r
 343                  * @param cssSelectText\r
 344                  * @return the escaped selector text.\r
 345                  */\r
 346                 escapeCssSelector : function( cssSelectText )\r
 347                 {\r
 348                         return cssSelectText.replace( /[\s#:.,$*^\[\]()~=+>]/g, '\\$&' );\r
 349                 },\r
 350 \r
 351                 /**\r
 352                  * Gets a unique number for this CKEDITOR execution session. It returns\r
 353                  * progressive numbers starting at 1.\r
 354                  * @function\r
 355                  * @returns {Number} A unique number.\r
 356                  * @example\r
 357                  * alert( CKEDITOR.tools.<b>getNextNumber()</b> );  // "1" (e.g.)\r
 358                  * alert( CKEDITOR.tools.<b>getNextNumber()</b> );  // "2"\r
 359                  */\r
 360                 getNextNumber : (function()\r
 361                 {\r
 362                         var last = 0;\r
 363                         return function()\r
 364                         {\r
 365                                 return ++last;\r
 366                         };\r
 367                 })(),\r
 368 \r
 369                 /**\r
 370                  * Creates a function override.\r
 371                  * @param {Function} originalFunction The function to be overridden.\r
 372                  * @param {Function} functionBuilder A function that returns the new\r
 373                  *              function. The original function reference will be passed to this\r
 374                  *              function.\r
 375                  * @returns {Function} The new function.\r
 376                  * @example\r
 377                  * var example =\r
 378                  * {\r
 379                  *     myFunction : function( name )\r
 380                  *     {\r
 381                  *         alert( 'Name: ' + name );\r
 382                  *     }\r
 383                  * };\r
 384                  *\r
 385                  * example.myFunction = CKEDITOR.tools.override( example.myFunction, function( myFunctionOriginal )\r
 386                  *     {\r
 387                  *         return function( name )\r
 388                  *             {\r
 389                  *                 alert( 'Override Name: ' + name );\r
 390                  *                 myFunctionOriginal.call( this, name );\r
 391                  *             };\r
 392                  *     });\r
 393                  */\r
 394                 override : function( originalFunction, functionBuilder )\r
 395                 {\r
 396                         return functionBuilder( originalFunction );\r
 397                 },\r
 398 \r
 399                 /**\r
 400                  * Executes a function after specified delay.\r
 401                  * @param {Function} func The function to be executed.\r
 402                  * @param {Number} [milliseconds] The amount of time (millisecods) to wait\r
 403                  *              to fire the function execution. Defaults to zero.\r
 404                  * @param {Object} [scope] The object to hold the function execution scope\r
 405                  *              (the "this" object). By default the "window" object.\r
 406                  * @param {Object|Array} [args] A single object, or an array of objects, to\r
 407                  *              pass as arguments to the function.\r
 408                  * @param {Object} [ownerWindow] The window that will be used to set the\r
 409                  *              timeout. By default the current "window".\r
 410                  * @returns {Object} A value that can be used to cancel the function execution.\r
 411                  * @example\r
 412                  * CKEDITOR.tools.<b>setTimeout(\r
 413                  *     function()\r
 414                  *     {\r
 415                  *         alert( 'Executed after 2 seconds' );\r
 416                  *     },\r
 417                  *     2000 )</b>;\r
 418                  */\r
 419                 setTimeout : function( func, milliseconds, scope, args, ownerWindow )\r
 420                 {\r
 421                         if ( !ownerWindow )\r
 422                                 ownerWindow = window;\r
 423 \r
 424                         if ( !scope )\r
 425                                 scope = ownerWindow;\r
 426 \r
 427                         return ownerWindow.setTimeout(\r
 428                                 function()\r
 429                                 {\r
 430                                         if ( args )\r
 431                                                 func.apply( scope, [].concat( args ) ) ;\r
 432                                         else\r
 433                                                 func.apply( scope ) ;\r
 434                                 },\r
 435                                 milliseconds || 0 );\r
 436                 },\r
 437 \r
 438                 /**\r
 439                  * Remove spaces from the start and the end of a string. The following\r
 440                  * characters are removed: space, tab, line break, line feed.\r
 441                  * @function\r
 442                  * @param {String} str The text from which remove the spaces.\r
 443                  * @returns {String} The modified string without the boundary spaces.\r
 444                  * @example\r
 445                  * alert( CKEDITOR.tools.trim( '  example ' );  // "example"\r
 446                  */\r
 447                 trim : (function()\r
 448                 {\r
 449                         // We are not using \s because we don't want "non-breaking spaces" to be caught.\r
 450                         var trimRegex = /(?:^[ \t\n\r]+)|(?:[ \t\n\r]+$)/g;\r
 451                         return function( str )\r
 452                         {\r
 453                                 return str.replace( trimRegex, '' ) ;\r
 454                         };\r
 455                 })(),\r
 456 \r
 457                 /**\r
 458                  * Remove spaces from the start (left) of a string. The following\r
 459                  * characters are removed: space, tab, line break, line feed.\r
 460                  * @function\r
 461                  * @param {String} str The text from which remove the spaces.\r
 462                  * @returns {String} The modified string excluding the removed spaces.\r
 463                  * @example\r
 464                  * alert( CKEDITOR.tools.ltrim( '  example ' );  // "example "\r
 465                  */\r
 466                 ltrim : (function()\r
 467                 {\r
 468                         // We are not using \s because we don't want "non-breaking spaces" to be caught.\r
 469                         var trimRegex = /^[ \t\n\r]+/g;\r
 470                         return function( str )\r
 471                         {\r
 472                                 return str.replace( trimRegex, '' ) ;\r
 473                         };\r
 474                 })(),\r
 475 \r
 476                 /**\r
 477                  * Remove spaces from the end (right) of a string. The following\r
 478                  * characters are removed: space, tab, line break, line feed.\r
 479                  * @function\r
 480                  * @param {String} str The text from which remove the spaces.\r
 481                  * @returns {String} The modified string excluding the removed spaces.\r
 482                  * @example\r
 483                  * alert( CKEDITOR.tools.ltrim( '  example ' );  // "  example"\r
 484                  */\r
 485                 rtrim : (function()\r
 486                 {\r
 487                         // We are not using \s because we don't want "non-breaking spaces" to be caught.\r
 488                         var trimRegex = /[ \t\n\r]+$/g;\r
 489                         return function( str )\r
 490                         {\r
 491                                 return str.replace( trimRegex, '' ) ;\r
 492                         };\r
 493                 })(),\r
 494 \r
 495                 /**\r
 496                  * Returns the index of an element in an array.\r
 497                  * @param {Array} array The array to be searched.\r
 498                  * @param {Object} entry The element to be found.\r
 499                  * @returns {Number} The (zero based) index of the first entry that matches\r
 500                  *              the entry, or -1 if not found.\r
 501                  * @example\r
 502                  * var letters = [ 'a', 'b', 0, 'c', false ];\r
 503                  * alert( CKEDITOR.tools.indexOf( letters, '0' ) );  "-1" because 0 !== '0'\r
 504                  * alert( CKEDITOR.tools.indexOf( letters, false ) );  "4" because 0 !== false\r
 505                  */\r
 506                 indexOf :\r
 507                         // #2514: We should try to use Array.indexOf if it does exist.\r
 508                         ( Array.prototype.indexOf ) ?\r
 509                                 function( array, entry )\r
 510                                         {\r
 511                                                 return array.indexOf( entry );\r
 512                                         }\r
 513                         :\r
 514                                 function( array, entry )\r
 515                                 {\r
 516                                         for ( var i = 0, len = array.length ; i < len ; i++ )\r
 517                                         {\r
 518                                                 if ( array[ i ] === entry )\r
 519                                                         return i;\r
 520                                         }\r
 521                                         return -1;\r
 522                                 },\r
 523 \r
 524                 /**\r
 525                  * Creates a function that will always execute in the context of a\r
 526                  * specified object.\r
 527                  * @param {Function} func The function to be executed.\r
 528                  * @param {Object} obj The object to which bind the execution context.\r
 529                  * @returns {Function} The function that can be used to execute the\r
 530                  *              "func" function in the context of "obj".\r
 531                  * @example\r
 532                  * var obj = { text : 'My Object' };\r
 533                  *\r
 534                  * function alertText()\r
 535                  * {\r
 536                  *     alert( this.text );\r
 537                  * }\r
 538                  *\r
 539                  * var newFunc = <b>CKEDITOR.tools.bind( alertText, obj )</b>;\r
 540                  * newFunc();  // Alerts "My Object".\r
 541                  */\r
 542                 bind : function( func, obj )\r
 543                 {\r
 544                         return function() { return func.apply( obj, arguments ); };\r
 545                 },\r
 546 \r
 547                 /**\r
 548                  * Class creation based on prototype inheritance, with supports of the\r
 549                  * following features:\r
 550                  * <ul>\r
 551                  * <li> Static fields </li>\r
 552                  * <li> Private fields </li>\r
 553                  * <li> Public (prototype) fields </li>\r
 554                  * <li> Chainable base class constructor </li>\r
 555                  * </ul>\r
 556                  * @param {Object} definition The class definition object.\r
 557                  * @returns {Function} A class-like JavaScript function.\r
 558                  */\r
 559                 createClass : function( definition )\r
 560                 {\r
 561                         var $ = definition.$,\r
 562                                 baseClass = definition.base,\r
 563                                 privates = definition.privates || definition._,\r
 564                                 proto = definition.proto,\r
 565                                 statics = definition.statics;\r
 566 \r
 567                         if ( privates )\r
 568                         {\r
 569                                 var originalConstructor = $;\r
 570                                 $ = function()\r
 571                                 {\r
 572                                         // Create (and get) the private namespace.\r
 573                                         var _ = this._ || ( this._ = {} );\r
 574 \r
 575                                         // Make some magic so "this" will refer to the main\r
 576                                         // instance when coding private functions.\r
 577                                         for ( var privateName in privates )\r
 578                                         {\r
 579                                                 var priv = privates[ privateName ];\r
 580 \r
 581                                                 _[ privateName ] =\r
 582                                                         ( typeof priv == 'function' ) ? CKEDITOR.tools.bind( priv, this ) : priv;\r
 583                                         }\r
 584 \r
 585                                         originalConstructor.apply( this, arguments );\r
 586                                 };\r
 587                         }\r
 588 \r
 589                         if ( baseClass )\r
 590                         {\r
 591                                 $.prototype = this.prototypedCopy( baseClass.prototype );\r
 592                                 $.prototype.constructor = $;\r
 593                                 $.prototype.base = function()\r
 594                                 {\r
 595                                         this.base = baseClass.prototype.base;\r
 596                                         baseClass.apply( this, arguments );\r
 597                                         this.base = arguments.callee;\r
 598                                 };\r
 599                         }\r
 600 \r
 601                         if ( proto )\r
 602                                 this.extend( $.prototype, proto, true );\r
 603 \r
 604                         if ( statics )\r
 605                                 this.extend( $, statics, true );\r
 606 \r
 607                         return $;\r
 608                 },\r
 609 \r
 610                 /**\r
 611                  * Creates a function reference that can be called later using\r
 612                  * CKEDITOR.tools.callFunction. This approach is specially useful to\r
 613                  * make DOM attribute function calls to JavaScript defined functions.\r
 614                  * @param {Function} fn The function to be executed on call.\r
 615                  * @param {Object} [scope] The object to have the context on "fn" execution.\r
 616                  * @returns {Number} A unique reference to be used in conjuction with\r
 617                  *              CKEDITOR.tools.callFunction.\r
 618                  * @example\r
 619                  * var ref = <b>CKEDITOR.tools.addFunction</b>(\r
 620                  *     function()\r
 621                  *     {\r
 622                  *         alert( 'Hello!');\r
 623                  *     });\r
 624                  * CKEDITOR.tools.callFunction( ref );  // Hello!\r
 625                  */\r
 626                 addFunction : function( fn, scope )\r
 627                 {\r
 628                         return functions.push( function()\r
 629                                 {\r
 630                                         fn.apply( scope || this, arguments );\r
 631                                 }) - 1;\r
 632                 },\r
 633 \r
 634                 /**\r
 635                  * Removes the function reference created with {@see CKEDITOR.tools.addFunction}.\r
 636                  * @param {Number} ref The function reference created with\r
 637                  *              CKEDITOR.tools.addFunction.\r
 638                  */\r
 639                 removeFunction : function( ref )\r
 640                 {\r
 641                         functions[ ref ] = null;\r
 642                 },\r
 643 \r
 644                 /**\r
 645                  * Executes a function based on the reference created with\r
 646                  * CKEDITOR.tools.addFunction.\r
 647                  * @param {Number} ref The function reference created with\r
 648                  *              CKEDITOR.tools.addFunction.\r
 649                  * @param {[Any,[Any,...]} params Any number of parameters to be passed\r
 650                  *              to the executed function.\r
 651                  * @returns {Any} The return value of the function.\r
 652                  * @example\r
 653                  * var ref = CKEDITOR.tools.addFunction(\r
 654                  *     function()\r
 655                  *     {\r
 656                  *         alert( 'Hello!');\r
 657                  *     });\r
 658                  * <b>CKEDITOR.tools.callFunction( ref )</b>;  // Hello!\r
 659                  */\r
 660                 callFunction : function( ref )\r
 661                 {\r
 662                         var fn = functions[ ref ];\r
 663                         return fn && fn.apply( window, Array.prototype.slice.call( arguments, 1 ) );\r
 664                 },\r
 665 \r
 666                 cssLength : (function()\r
 667                 {\r
 668                         var decimalRegex = /^\d+(?:\.\d+)?$/;\r
 669                         return function( length )\r
 670                         {\r
 671                                 return length + ( decimalRegex.test( length ) ? 'px' : '' );\r
 672                         };\r
 673                 })(),\r
 674 \r
 675                 repeat : function( str, times )\r
 676                 {\r
 677                         return new Array( times + 1 ).join( str );\r
 678                 },\r
 679 \r
 680                 tryThese : function()\r
 681                 {\r
 682                         var returnValue;\r
 683                         for ( var i = 0, length = arguments.length; i < length; i++ )\r
 684                         {\r
 685                                 var lambda = arguments[i];\r
 686                                 try\r
 687                                 {\r
 688                                         returnValue = lambda();\r
 689                                         break;\r
 690                                 }\r
 691                                 catch (e) {}\r
 692                         }\r
 693                         return returnValue;\r
 694                 }\r
 695         };\r
 696 })();\r
 697 \r
 698 // PACKAGER_RENAME( CKEDITOR.tools )\r