_source/core/dom/node.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.dom.node} class, which is the base\r
   8  *              class for classes that represent DOM nodes.\r
   9  */\r
  10 \r
  11 /**\r
  12  * Base class for classes representing DOM nodes. This constructor may return\r
  13  * and instance of classes that inherits this class, like\r
  14  * {@link CKEDITOR.dom.element} or {@link CKEDITOR.dom.text}.\r
  15  * @augments CKEDITOR.dom.domObject\r
  16  * @param {Object} domNode A native DOM node.\r
  17  * @constructor\r
  18  * @see CKEDITOR.dom.element\r
  19  * @see CKEDITOR.dom.text\r
  20  * @example\r
  21  */\r
  22 CKEDITOR.dom.node = function( domNode )\r
  23 {\r
  24         if ( domNode )\r
  25         {\r
  26                 switch ( domNode.nodeType )\r
  27                 {\r
  28                         // Safari don't consider document as element node type. (#3389)\r
  29                         case CKEDITOR.NODE_DOCUMENT :\r
  30                                 return new CKEDITOR.dom.document( domNode );\r
  31 \r
  32                         case CKEDITOR.NODE_ELEMENT :\r
  33                                 return new CKEDITOR.dom.element( domNode );\r
  34 \r
  35                         case CKEDITOR.NODE_TEXT :\r
  36                                 return new CKEDITOR.dom.text( domNode );\r
  37                 }\r
  38 \r
  39                 // Call the base constructor.\r
  40                 CKEDITOR.dom.domObject.call( this, domNode );\r
  41         }\r
  42 \r
  43         return this;\r
  44 };\r
  45 \r
  46 CKEDITOR.dom.node.prototype = new CKEDITOR.dom.domObject();\r
  47 \r
  48 /**\r
  49  * Element node type.\r
  50  * @constant\r
  51  * @example\r
  52  */\r
  53 CKEDITOR.NODE_ELEMENT = 1;\r
  54 \r
  55 /**\r
  56  * Document node type.\r
  57  * @constant\r
  58  * @example\r
  59  */\r
  60 CKEDITOR.NODE_DOCUMENT = 9;\r
  61 \r
  62 /**\r
  63  * Text node type.\r
  64  * @constant\r
  65  * @example\r
  66  */\r
  67 CKEDITOR.NODE_TEXT = 3;\r
  68 \r
  69 /**\r
  70  * Comment node type.\r
  71  * @constant\r
  72  * @example\r
  73  */\r
  74 CKEDITOR.NODE_COMMENT = 8;\r
  75 \r
  76 CKEDITOR.NODE_DOCUMENT_FRAGMENT = 11;\r
  77 \r
  78 CKEDITOR.POSITION_IDENTICAL = 0;\r
  79 CKEDITOR.POSITION_DISCONNECTED = 1;\r
  80 CKEDITOR.POSITION_FOLLOWING = 2;\r
  81 CKEDITOR.POSITION_PRECEDING = 4;\r
  82 CKEDITOR.POSITION_IS_CONTAINED = 8;\r
  83 CKEDITOR.POSITION_CONTAINS = 16;\r
  84 \r
  85 CKEDITOR.tools.extend( CKEDITOR.dom.node.prototype,\r
  86         /** @lends CKEDITOR.dom.node.prototype */\r
  87         {\r
  88                 /**\r
  89                  * Makes this node child of another element.\r
  90                  * @param {CKEDITOR.dom.element} element The target element to which append\r
  91                  *              this node.\r
  92                  * @returns {CKEDITOR.dom.element} The target element.\r
  93                  * @example\r
  94                  * var p = new CKEDITOR.dom.element( 'p' );\r
  95                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
  96                  * strong.appendTo( p );\r
  97                  *\r
  98                  * // result: "&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;"\r
  99                  */\r
 100                 appendTo : function( element, toStart )\r
 101                 {\r
 102                         element.append( this, toStart );\r
 103                         return element;\r
 104                 },\r
 105 \r
 106                 clone : function( includeChildren, cloneId )\r
 107                 {\r
 108                         var $clone = this.$.cloneNode( includeChildren );\r
 109 \r
 110                         var removeIds = function( node )\r
 111                         {\r
 112                                 if ( node.nodeType != CKEDITOR.NODE_ELEMENT )\r
 113                                         return;\r
 114 \r
 115                                 if ( !cloneId )\r
 116                                         node.removeAttribute( 'id', false );\r
 117                                 node.removeAttribute( 'data-cke-expando', false );\r
 118 \r
 119                                 if ( includeChildren )\r
 120                                 {\r
 121                                         var childs = node.childNodes;\r
 122                                         for ( var i=0; i < childs.length; i++ )\r
 123                                                 removeIds( childs[ i ] );\r
 124                                 }\r
 125                         };\r
 126 \r
 127                         // The "id" attribute should never be cloned to avoid duplication.\r
 128                         removeIds( $clone );\r
 129 \r
 130                         return new CKEDITOR.dom.node( $clone );\r
 131                 },\r
 132 \r
 133                 hasPrevious : function()\r
 134                 {\r
 135                         return !!this.$.previousSibling;\r
 136                 },\r
 137 \r
 138                 hasNext : function()\r
 139                 {\r
 140                         return !!this.$.nextSibling;\r
 141                 },\r
 142 \r
 143                 /**\r
 144                  * Inserts this element after a node.\r
 145                  * @param {CKEDITOR.dom.node} node The that will preceed this element.\r
 146                  * @returns {CKEDITOR.dom.node} The node preceeding this one after\r
 147                  *              insertion.\r
 148                  * @example\r
 149                  * var em = new CKEDITOR.dom.element( 'em' );\r
 150                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
 151                  * strong.insertAfter( em );\r
 152                  *\r
 153                  * // result: "&lt;em&gt;&lt;/em&gt;&lt;strong&gt;&lt;/strong&gt;"\r
 154                  */\r
 155                 insertAfter : function( node )\r
 156                 {\r
 157                         node.$.parentNode.insertBefore( this.$, node.$.nextSibling );\r
 158                         return node;\r
 159                 },\r
 160 \r
 161                 /**\r
 162                  * Inserts this element before a node.\r
 163                  * @param {CKEDITOR.dom.node} node The that will be after this element.\r
 164                  * @returns {CKEDITOR.dom.node} The node being inserted.\r
 165                  * @example\r
 166                  * var em = new CKEDITOR.dom.element( 'em' );\r
 167                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
 168                  * strong.insertBefore( em );\r
 169                  *\r
 170                  * // result: "&lt;strong&gt;&lt;/strong&gt;&lt;em&gt;&lt;/em&gt;"\r
 171                  */\r
 172                 insertBefore : function( node )\r
 173                 {\r
 174                         node.$.parentNode.insertBefore( this.$, node.$ );\r
 175                         return node;\r
 176                 },\r
 177 \r
 178                 insertBeforeMe : function( node )\r
 179                 {\r
 180                         this.$.parentNode.insertBefore( node.$, this.$ );\r
 181                         return node;\r
 182                 },\r
 183 \r
 184                 /**\r
 185                  * Retrieves a uniquely identifiable tree address for this node.\r
 186                  * The tree address returns is an array of integers, with each integer\r
 187                  * indicating a child index of a DOM node, starting from\r
 188                  * document.documentElement.\r
 189                  *\r
 190                  * For example, assuming <body> is the second child from <html> (<head>\r
 191                  * being the first), and we'd like to address the third child under the\r
 192                  * fourth child of body, the tree address returned would be:\r
 193                  * [1, 3, 2]\r
 194                  *\r
 195                  * The tree address cannot be used for finding back the DOM tree node once\r
 196                  * the DOM tree structure has been modified.\r
 197                  */\r
 198                 getAddress : function( normalized )\r
 199                 {\r
 200                         var address = [];\r
 201                         var $documentElement = this.getDocument().$.documentElement;\r
 202                         var node = this.$;\r
 203 \r
 204                         while ( node && node != $documentElement )\r
 205                         {\r
 206                                 var parentNode = node.parentNode;\r
 207                                 var currentIndex = -1;\r
 208 \r
 209                                 if ( parentNode )\r
 210                                 {\r
 211                                         for ( var i = 0 ; i < parentNode.childNodes.length ; i++ )\r
 212                                         {\r
 213                                                 var candidate = parentNode.childNodes[i];\r
 214 \r
 215                                                 if ( normalized &&\r
 216                                                                 candidate.nodeType == 3 &&\r
 217                                                                 candidate.previousSibling &&\r
 218                                                                 candidate.previousSibling.nodeType == 3 )\r
 219                                                 {\r
 220                                                         continue;\r
 221                                                 }\r
 222 \r
 223                                                 currentIndex++;\r
 224 \r
 225                                                 if ( candidate == node )\r
 226                                                         break;\r
 227                                         }\r
 228 \r
 229                                         address.unshift( currentIndex );\r
 230                                 }\r
 231 \r
 232                                 node = parentNode;\r
 233                         }\r
 234 \r
 235                         return address;\r
 236                 },\r
 237 \r
 238                 /**\r
 239                  * Gets the document containing this element.\r
 240                  * @returns {CKEDITOR.dom.document} The document.\r
 241                  * @example\r
 242                  * var element = CKEDITOR.document.getById( 'example' );\r
 243                  * alert( <b>element.getDocument().equals( CKEDITOR.document )</b> );  // "true"\r
 244                  */\r
 245                 getDocument : function()\r
 246                 {\r
 247                         return new CKEDITOR.dom.document( this.$.ownerDocument || this.$.parentNode.ownerDocument );\r
 248                 },\r
 249 \r
 250                 getIndex : function()\r
 251                 {\r
 252                         var $ = this.$;\r
 253 \r
 254                         var currentNode = $.parentNode && $.parentNode.firstChild;\r
 255                         var currentIndex = -1;\r
 256 \r
 257                         while ( currentNode )\r
 258                         {\r
 259                                 currentIndex++;\r
 260 \r
 261                                 if ( currentNode == $ )\r
 262                                         return currentIndex;\r
 263 \r
 264                                 currentNode = currentNode.nextSibling;\r
 265                         }\r
 266 \r
 267                         return -1;\r
 268                 },\r
 269 \r
 270                 getNextSourceNode : function( startFromSibling, nodeType, guard )\r
 271                 {\r
 272                         // If "guard" is a node, transform it in a function.\r
 273                         if ( guard && !guard.call )\r
 274                         {\r
 275                                 var guardNode = guard;\r
 276                                 guard = function( node )\r
 277                                 {\r
 278                                         return !node.equals( guardNode );\r
 279                                 };\r
 280                         }\r
 281 \r
 282                         var node = ( !startFromSibling && this.getFirst && this.getFirst() ),\r
 283                                 parent;\r
 284 \r
 285                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 286                         // send the 'moving out' signal even we don't actually dive into.\r
 287                         if ( !node )\r
 288                         {\r
 289                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 290                                         return null;\r
 291                                 node = this.getNext();\r
 292                         }\r
 293 \r
 294                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 295                         {\r
 296                                 // The guard check sends the "true" paramenter to indicate that\r
 297                                 // we are moving "out" of the element.\r
 298                                 if ( guard && guard( parent, true ) === false )\r
 299                                         return null;\r
 300 \r
 301                                 node = parent.getNext();\r
 302                         }\r
 303 \r
 304                         if ( !node )\r
 305                                 return null;\r
 306 \r
 307                         if ( guard && guard( node ) === false )\r
 308                                 return null;\r
 309 \r
 310                         if ( nodeType && nodeType != node.type )\r
 311                                 return node.getNextSourceNode( false, nodeType, guard );\r
 312 \r
 313                         return node;\r
 314                 },\r
 315 \r
 316                 getPreviousSourceNode : function( startFromSibling, nodeType, guard )\r
 317                 {\r
 318                         if ( guard && !guard.call )\r
 319                         {\r
 320                                 var guardNode = guard;\r
 321                                 guard = function( node )\r
 322                                 {\r
 323                                         return !node.equals( guardNode );\r
 324                                 };\r
 325                         }\r
 326 \r
 327                         var node = ( !startFromSibling && this.getLast && this.getLast() ),\r
 328                                 parent;\r
 329 \r
 330                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 331                         // send the 'moving out' signal even we don't actually dive into.\r
 332                         if ( !node )\r
 333                         {\r
 334                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 335                                         return null;\r
 336                                 node = this.getPrevious();\r
 337                         }\r
 338 \r
 339                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 340                         {\r
 341                                 // The guard check sends the "true" paramenter to indicate that\r
 342                                 // we are moving "out" of the element.\r
 343                                 if ( guard && guard( parent, true ) === false )\r
 344                                         return null;\r
 345 \r
 346                                 node = parent.getPrevious();\r
 347                         }\r
 348 \r
 349                         if ( !node )\r
 350                                 return null;\r
 351 \r
 352                         if ( guard && guard( node ) === false )\r
 353                                 return null;\r
 354 \r
 355                         if ( nodeType && node.type != nodeType )\r
 356                                 return node.getPreviousSourceNode( false, nodeType, guard );\r
 357 \r
 358                         return node;\r
 359                 },\r
 360 \r
 361                 getPrevious : function( evaluator )\r
 362                 {\r
 363                         var previous = this.$, retval;\r
 364                         do\r
 365                         {\r
 366                                 previous = previous.previousSibling;\r
 367                                 retval = previous && new CKEDITOR.dom.node( previous );\r
 368                         }\r
 369                         while ( retval && evaluator && !evaluator( retval ) )\r
 370                         return retval;\r
 371                 },\r
 372 \r
 373                 /**\r
 374                  * Gets the node that follows this element in its parent's child list.\r
 375                  * @param {Function} evaluator Filtering the result node.\r
 376                  * @returns {CKEDITOR.dom.node} The next node or null if not available.\r
 377                  * @example\r
 378                  * var element = CKEDITOR.dom.element.createFromHtml( '&lt;div&gt;&lt;b&gt;Example&lt;/b&gt; &lt;i&gt;next&lt;/i&gt;&lt;/div&gt;' );\r
 379                  * var first = <b>element.getFirst().getNext()</b>;\r
 380                  * alert( first.getName() );  // "i"\r
 381                  */\r
 382                 getNext : function( evaluator )\r
 383                 {\r
 384                         var next = this.$, retval;\r
 385                         do\r
 386                         {\r
 387                                 next = next.nextSibling;\r
 388                                 retval = next && new CKEDITOR.dom.node( next );\r
 389                         }\r
 390                         while ( retval && evaluator && !evaluator( retval ) )\r
 391                         return retval;\r
 392                 },\r
 393 \r
 394                 /**\r
 395                  * Gets the parent element for this node.\r
 396                  * @returns {CKEDITOR.dom.element} The parent element.\r
 397                  * @example\r
 398                  * var node = editor.document.getBody().getFirst();\r
 399                  * var parent = node.<b>getParent()</b>;\r
 400                  * alert( node.getName() );  // "body"\r
 401                  */\r
 402                 getParent : function()\r
 403                 {\r
 404                         var parent = this.$.parentNode;\r
 405                         return ( parent && parent.nodeType == 1 ) ? new CKEDITOR.dom.node( parent ) : null;\r
 406                 },\r
 407 \r
 408                 getParents : function( closerFirst )\r
 409                 {\r
 410                         var node = this;\r
 411                         var parents = [];\r
 412 \r
 413                         do\r
 414                         {\r
 415                                 parents[  closerFirst ? 'push' : 'unshift' ]( node );\r
 416                         }\r
 417                         while ( ( node = node.getParent() ) )\r
 418 \r
 419                         return parents;\r
 420                 },\r
 421 \r
 422                 getCommonAncestor : function( node )\r
 423                 {\r
 424                         if ( node.equals( this ) )\r
 425                                 return this;\r
 426 \r
 427                         if ( node.contains && node.contains( this ) )\r
 428                                 return node;\r
 429 \r
 430                         var start = this.contains ? this : this.getParent();\r
 431 \r
 432                         do\r
 433                         {\r
 434                                 if ( start.contains( node ) )\r
 435                                         return start;\r
 436                         }\r
 437                         while ( ( start = start.getParent() ) );\r
 438 \r
 439                         return null;\r
 440                 },\r
 441 \r
 442                 getPosition : function( otherNode )\r
 443                 {\r
 444                         var $ = this.$;\r
 445                         var $other = otherNode.$;\r
 446 \r
 447                         if ( $.compareDocumentPosition )\r
 448                                 return $.compareDocumentPosition( $other );\r
 449 \r
 450                         // IE and Safari have no support for compareDocumentPosition.\r
 451 \r
 452                         if ( $ == $other )\r
 453                                 return CKEDITOR.POSITION_IDENTICAL;\r
 454 \r
 455                         // Only element nodes support contains and sourceIndex.\r
 456                         if ( this.type == CKEDITOR.NODE_ELEMENT && otherNode.type == CKEDITOR.NODE_ELEMENT )\r
 457                         {\r
 458                                 if ( $.contains )\r
 459                                 {\r
 460                                         if ( $.contains( $other ) )\r
 461                                                 return CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING;\r
 462 \r
 463                                         if ( $other.contains( $ ) )\r
 464                                                 return CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 465                                 }\r
 466 \r
 467                                 if ( 'sourceIndex' in $ )\r
 468                                 {\r
 469                                         return ( $.sourceIndex < 0 || $other.sourceIndex < 0 ) ? CKEDITOR.POSITION_DISCONNECTED :\r
 470                                                 ( $.sourceIndex < $other.sourceIndex ) ? CKEDITOR.POSITION_PRECEDING :\r
 471                                                 CKEDITOR.POSITION_FOLLOWING;\r
 472                                 }\r
 473                         }\r
 474 \r
 475                         // For nodes that don't support compareDocumentPosition, contains\r
 476                         // or sourceIndex, their "address" is compared.\r
 477 \r
 478                         var addressOfThis = this.getAddress(),\r
 479                                 addressOfOther = otherNode.getAddress(),\r
 480                                 minLevel = Math.min( addressOfThis.length, addressOfOther.length );\r
 481 \r
 482                                 // Determinate preceed/follow relationship.\r
 483                                 for ( var i = 0 ; i <= minLevel - 1 ; i++ )\r
 484                                 {\r
 485                                         if ( addressOfThis[ i ] != addressOfOther[ i ] )\r
 486                                         {\r
 487                                                 if ( i < minLevel )\r
 488                                                 {\r
 489                                                         return addressOfThis[ i ] < addressOfOther[ i ] ?\r
 490                                                             CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_FOLLOWING;\r
 491                                                 }\r
 492                                                 break;\r
 493                                         }\r
 494                                 }\r
 495 \r
 496                                 // Determinate contains/contained relationship.\r
 497                                 return ( addressOfThis.length < addressOfOther.length ) ?\r
 498                                                         CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING :\r
 499                                                         CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 500                 },\r
 501 \r
 502                 /**\r
 503                  * Gets the closes ancestor node of a specified node name.\r
 504                  * @param {String} name Node name of ancestor node.\r
 505                  * @param {Boolean} includeSelf (Optional) Whether to include the current\r
 506                  * node in the calculation or not.\r
 507                  * @returns {CKEDITOR.dom.node} Ancestor node.\r
 508                  */\r
 509                 getAscendant : function( name, includeSelf )\r
 510                 {\r
 511                         var $ = this.$;\r
 512 \r
 513                         if ( !includeSelf )\r
 514                                 $ = $.parentNode;\r
 515 \r
 516                         while ( $ )\r
 517                         {\r
 518                                 if ( $.nodeName && $.nodeName.toLowerCase() == name )\r
 519                                         return new CKEDITOR.dom.node( $ );\r
 520 \r
 521                                 $ = $.parentNode;\r
 522                         }\r
 523                         return null;\r
 524                 },\r
 525 \r
 526                 hasAscendant : function( name, includeSelf )\r
 527                 {\r
 528                         var $ = this.$;\r
 529 \r
 530                         if ( !includeSelf )\r
 531                                 $ = $.parentNode;\r
 532 \r
 533                         while ( $ )\r
 534                         {\r
 535                                 if ( $.nodeName && $.nodeName.toLowerCase() == name )\r
 536                                         return true;\r
 537 \r
 538                                 $ = $.parentNode;\r
 539                         }\r
 540                         return false;\r
 541                 },\r
 542 \r
 543                 move : function( target, toStart )\r
 544                 {\r
 545                         target.append( this.remove(), toStart );\r
 546                 },\r
 547 \r
 548                 /**\r
 549                  * Removes this node from the document DOM.\r
 550                  * @param {Boolean} [preserveChildren] Indicates that the children\r
 551                  *              elements must remain in the document, removing only the outer\r
 552                  *              tags.\r
 553                  * @example\r
 554                  * var element = CKEDITOR.dom.element.getById( 'MyElement' );\r
 555                  * <b>element.remove()</b>;\r
 556                  */\r
 557                 remove : function( preserveChildren )\r
 558                 {\r
 559                         var $ = this.$;\r
 560                         var parent = $.parentNode;\r
 561 \r
 562                         if ( parent )\r
 563                         {\r
 564                                 if ( preserveChildren )\r
 565                                 {\r
 566                                         // Move all children before the node.\r
 567                                         for ( var child ; ( child = $.firstChild ) ; )\r
 568                                         {\r
 569                                                 parent.insertBefore( $.removeChild( child ), $ );\r
 570                                         }\r
 571                                 }\r
 572 \r
 573                                 parent.removeChild( $ );\r
 574                         }\r
 575 \r
 576                         return this;\r
 577                 },\r
 578 \r
 579                 replace : function( nodeToReplace )\r
 580                 {\r
 581                         this.insertBefore( nodeToReplace );\r
 582                         nodeToReplace.remove();\r
 583                 },\r
 584 \r
 585                 trim : function()\r
 586                 {\r
 587                         this.ltrim();\r
 588                         this.rtrim();\r
 589                 },\r
 590 \r
 591                 ltrim : function()\r
 592                 {\r
 593                         var child;\r
 594                         while ( this.getFirst && ( child = this.getFirst() ) )\r
 595                         {\r
 596                                 if ( child.type == CKEDITOR.NODE_TEXT )\r
 597                                 {\r
 598                                         var trimmed = CKEDITOR.tools.ltrim( child.getText() ),\r
 599                                                 originalLength = child.getLength();\r
 600 \r
 601                                         if ( !trimmed )\r
 602                                         {\r
 603                                                 child.remove();\r
 604                                                 continue;\r
 605                                         }\r
 606                                         else if ( trimmed.length < originalLength )\r
 607                                         {\r
 608                                                 child.split( originalLength - trimmed.length );\r
 609 \r
 610                                                 // IE BUG: child.remove() may raise JavaScript errors here. (#81)\r
 611                                                 this.$.removeChild( this.$.firstChild );\r
 612                                         }\r
 613                                 }\r
 614                                 break;\r
 615                         }\r
 616                 },\r
 617 \r
 618                 rtrim : function()\r
 619                 {\r
 620                         var child;\r
 621                         while ( this.getLast && ( child = this.getLast() ) )\r
 622                         {\r
 623                                 if ( child.type == CKEDITOR.NODE_TEXT )\r
 624                                 {\r
 625                                         var trimmed = CKEDITOR.tools.rtrim( child.getText() ),\r
 626                                                 originalLength = child.getLength();\r
 627 \r
 628                                         if ( !trimmed )\r
 629                                         {\r
 630                                                 child.remove();\r
 631                                                 continue;\r
 632                                         }\r
 633                                         else if ( trimmed.length < originalLength )\r
 634                                         {\r
 635                                                 child.split( trimmed.length );\r
 636 \r
 637                                                 // IE BUG: child.getNext().remove() may raise JavaScript errors here.\r
 638                                                 // (#81)\r
 639                                                 this.$.lastChild.parentNode.removeChild( this.$.lastChild );\r
 640                                         }\r
 641                                 }\r
 642                                 break;\r
 643                         }\r
 644 \r
 645                         if ( !CKEDITOR.env.ie && !CKEDITOR.env.opera )\r
 646                         {\r
 647                                 child = this.$.lastChild;\r
 648 \r
 649                                 if ( child && child.type == 1 && child.nodeName.toLowerCase() == 'br' )\r
 650                                 {\r
 651                                         // Use "eChildNode.parentNode" instead of "node" to avoid IE bug (#324).\r
 652                                         child.parentNode.removeChild( child ) ;\r
 653                                 }\r
 654                         }\r
 655                 },\r
 656 \r
 657                 /**\r
 658                  * Checks is this node is read-only (should not be changed). It\r
 659                  * additionaly returns the element, if any, which defines the read-only\r
 660                  * state of this node. It may be the node itself or any of its parent\r
 661                  * nodes.\r
 662                  * @returns {CKEDITOR.dom.element|Boolean} An element containing\r
 663                  *              read-only attributes or "false" if none is found.\r
 664                  * @since 3.5\r
 665                  * @example\r
 666                  * // For the following HTML:\r
 667                  * // <div contenteditable="false">Some <b>text</b></div>\r
 668                  *\r
 669                  * // If "ele" is the above <div>\r
 670                  * ele.getReadOnlyRoot();  // the <div> element\r
 671                  *\r
 672                  * // If "ele" is the above <b>\r
 673                  * ele.getReadOnlyRoot();  // the <div> element\r
 674                  */\r
 675                 isReadOnly : function()\r
 676                 {\r
 677                         var current = this;\r
 678                         while( current )\r
 679                         {\r
 680                                 if ( current.type == CKEDITOR.NODE_ELEMENT )\r
 681                                 {\r
 682                                         if ( current.is( 'body' ) || current.getCustomData( '_cke_notReadOnly' ) )\r
 683                                                 break;\r
 684 \r
 685                                         if ( current.getAttribute( 'contentEditable' ) == 'false' )\r
 686                                                 return current;\r
 687                                         else if ( current.getAttribute( 'contentEditable' ) == 'true' )\r
 688                                                 break;\r
 689                                 }\r
 690                                 current = current.getParent();\r
 691                         }\r
 692 \r
 693                         return false;\r
 694                 }\r
 695         }\r
 696 );\r