_source/core/dom/node.js

   1 /*\r
   2 Copyright (c) 2003-2011, 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 \r
 208                                 if ( parentNode )\r
 209                                 {\r
 210                                         // Get the node index. For performance, call getIndex\r
 211                                         // directly, instead of creating a new node object.\r
 212                                         address.unshift( this.getIndex.call( { $ : node }, normalized ) );\r
 213                                 }\r
 214 \r
 215                                 node = parentNode;\r
 216                         }\r
 217 \r
 218                         return address;\r
 219                 },\r
 220 \r
 221                 /**\r
 222                  * Gets the document containing this element.\r
 223                  * @returns {CKEDITOR.dom.document} The document.\r
 224                  * @example\r
 225                  * var element = CKEDITOR.document.getById( 'example' );\r
 226                  * alert( <b>element.getDocument().equals( CKEDITOR.document )</b> );  // "true"\r
 227                  */\r
 228                 getDocument : function()\r
 229                 {\r
 230                         return new CKEDITOR.dom.document( this.$.ownerDocument || this.$.parentNode.ownerDocument );\r
 231                 },\r
 232 \r
 233                 getIndex : function( normalized )\r
 234                 {\r
 235                         // Attention: getAddress depends on this.$\r
 236 \r
 237                         var current = this.$,\r
 238                                 index = 0;\r
 239 \r
 240                         while ( ( current = current.previousSibling ) )\r
 241                         {\r
 242                                 // When normalizing, do not count it if this is an\r
 243                                 // empty text node or if it's a text node following another one.\r
 244                                 if ( normalized && current.nodeType == 3 &&\r
 245                                          ( !current.nodeValue.length ||\r
 246                                            ( current.previousSibling && current.previousSibling.nodeType == 3 ) ) )\r
 247                                 {\r
 248                                         continue;\r
 249                                 }\r
 250 \r
 251                                 index++;\r
 252                         }\r
 253 \r
 254                         return index;\r
 255                 },\r
 256 \r
 257                 getNextSourceNode : function( startFromSibling, nodeType, guard )\r
 258                 {\r
 259                         // If "guard" is a node, transform it in a function.\r
 260                         if ( guard && !guard.call )\r
 261                         {\r
 262                                 var guardNode = guard;\r
 263                                 guard = function( node )\r
 264                                 {\r
 265                                         return !node.equals( guardNode );\r
 266                                 };\r
 267                         }\r
 268 \r
 269                         var node = ( !startFromSibling && this.getFirst && this.getFirst() ),\r
 270                                 parent;\r
 271 \r
 272                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 273                         // send the 'moving out' signal even we don't actually dive into.\r
 274                         if ( !node )\r
 275                         {\r
 276                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 277                                         return null;\r
 278                                 node = this.getNext();\r
 279                         }\r
 280 \r
 281                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 282                         {\r
 283                                 // The guard check sends the "true" paramenter to indicate that\r
 284                                 // we are moving "out" of the element.\r
 285                                 if ( guard && guard( parent, true ) === false )\r
 286                                         return null;\r
 287 \r
 288                                 node = parent.getNext();\r
 289                         }\r
 290 \r
 291                         if ( !node )\r
 292                                 return null;\r
 293 \r
 294                         if ( guard && guard( node ) === false )\r
 295                                 return null;\r
 296 \r
 297                         if ( nodeType && nodeType != node.type )\r
 298                                 return node.getNextSourceNode( false, nodeType, guard );\r
 299 \r
 300                         return node;\r
 301                 },\r
 302 \r
 303                 getPreviousSourceNode : function( startFromSibling, nodeType, guard )\r
 304                 {\r
 305                         if ( guard && !guard.call )\r
 306                         {\r
 307                                 var guardNode = guard;\r
 308                                 guard = function( node )\r
 309                                 {\r
 310                                         return !node.equals( guardNode );\r
 311                                 };\r
 312                         }\r
 313 \r
 314                         var node = ( !startFromSibling && this.getLast && this.getLast() ),\r
 315                                 parent;\r
 316 \r
 317                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 318                         // send the 'moving out' signal even we don't actually dive into.\r
 319                         if ( !node )\r
 320                         {\r
 321                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 322                                         return null;\r
 323                                 node = this.getPrevious();\r
 324                         }\r
 325 \r
 326                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 327                         {\r
 328                                 // The guard check sends the "true" paramenter to indicate that\r
 329                                 // we are moving "out" of the element.\r
 330                                 if ( guard && guard( parent, true ) === false )\r
 331                                         return null;\r
 332 \r
 333                                 node = parent.getPrevious();\r
 334                         }\r
 335 \r
 336                         if ( !node )\r
 337                                 return null;\r
 338 \r
 339                         if ( guard && guard( node ) === false )\r
 340                                 return null;\r
 341 \r
 342                         if ( nodeType && node.type != nodeType )\r
 343                                 return node.getPreviousSourceNode( false, nodeType, guard );\r
 344 \r
 345                         return node;\r
 346                 },\r
 347 \r
 348                 getPrevious : function( evaluator )\r
 349                 {\r
 350                         var previous = this.$, retval;\r
 351                         do\r
 352                         {\r
 353                                 previous = previous.previousSibling;\r
 354                                 retval = previous && new CKEDITOR.dom.node( previous );\r
 355                         }\r
 356                         while ( retval && evaluator && !evaluator( retval ) )\r
 357                         return retval;\r
 358                 },\r
 359 \r
 360                 /**\r
 361                  * Gets the node that follows this element in its parent's child list.\r
 362                  * @param {Function} evaluator Filtering the result node.\r
 363                  * @returns {CKEDITOR.dom.node} The next node or null if not available.\r
 364                  * @example\r
 365                  * var element = CKEDITOR.dom.element.createFromHtml( '&lt;div&gt;&lt;b&gt;Example&lt;/b&gt; &lt;i&gt;next&lt;/i&gt;&lt;/div&gt;' );\r
 366                  * var first = <b>element.getFirst().getNext()</b>;\r
 367                  * alert( first.getName() );  // "i"\r
 368                  */\r
 369                 getNext : function( evaluator )\r
 370                 {\r
 371                         var next = this.$, retval;\r
 372                         do\r
 373                         {\r
 374                                 next = next.nextSibling;\r
 375                                 retval = next && new CKEDITOR.dom.node( next );\r
 376                         }\r
 377                         while ( retval && evaluator && !evaluator( retval ) )\r
 378                         return retval;\r
 379                 },\r
 380 \r
 381                 /**\r
 382                  * Gets the parent element for this node.\r
 383                  * @returns {CKEDITOR.dom.element} The parent element.\r
 384                  * @example\r
 385                  * var node = editor.document.getBody().getFirst();\r
 386                  * var parent = node.<b>getParent()</b>;\r
 387                  * alert( node.getName() );  // "body"\r
 388                  */\r
 389                 getParent : function()\r
 390                 {\r
 391                         var parent = this.$.parentNode;\r
 392                         return ( parent && parent.nodeType == 1 ) ? new CKEDITOR.dom.node( parent ) : null;\r
 393                 },\r
 394 \r
 395                 getParents : function( closerFirst )\r
 396                 {\r
 397                         var node = this;\r
 398                         var parents = [];\r
 399 \r
 400                         do\r
 401                         {\r
 402                                 parents[  closerFirst ? 'push' : 'unshift' ]( node );\r
 403                         }\r
 404                         while ( ( node = node.getParent() ) )\r
 405 \r
 406                         return parents;\r
 407                 },\r
 408 \r
 409                 getCommonAncestor : function( node )\r
 410                 {\r
 411                         if ( node.equals( this ) )\r
 412                                 return this;\r
 413 \r
 414                         if ( node.contains && node.contains( this ) )\r
 415                                 return node;\r
 416 \r
 417                         var start = this.contains ? this : this.getParent();\r
 418 \r
 419                         do\r
 420                         {\r
 421                                 if ( start.contains( node ) )\r
 422                                         return start;\r
 423                         }\r
 424                         while ( ( start = start.getParent() ) );\r
 425 \r
 426                         return null;\r
 427                 },\r
 428 \r
 429                 getPosition : function( otherNode )\r
 430                 {\r
 431                         var $ = this.$;\r
 432                         var $other = otherNode.$;\r
 433 \r
 434                         if ( $.compareDocumentPosition )\r
 435                                 return $.compareDocumentPosition( $other );\r
 436 \r
 437                         // IE and Safari have no support for compareDocumentPosition.\r
 438 \r
 439                         if ( $ == $other )\r
 440                                 return CKEDITOR.POSITION_IDENTICAL;\r
 441 \r
 442                         // Only element nodes support contains and sourceIndex.\r
 443                         if ( this.type == CKEDITOR.NODE_ELEMENT && otherNode.type == CKEDITOR.NODE_ELEMENT )\r
 444                         {\r
 445                                 if ( $.contains )\r
 446                                 {\r
 447                                         if ( $.contains( $other ) )\r
 448                                                 return CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING;\r
 449 \r
 450                                         if ( $other.contains( $ ) )\r
 451                                                 return CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 452                                 }\r
 453 \r
 454                                 if ( 'sourceIndex' in $ )\r
 455                                 {\r
 456                                         return ( $.sourceIndex < 0 || $other.sourceIndex < 0 ) ? CKEDITOR.POSITION_DISCONNECTED :\r
 457                                                 ( $.sourceIndex < $other.sourceIndex ) ? CKEDITOR.POSITION_PRECEDING :\r
 458                                                 CKEDITOR.POSITION_FOLLOWING;\r
 459                                 }\r
 460                         }\r
 461 \r
 462                         // For nodes that don't support compareDocumentPosition, contains\r
 463                         // or sourceIndex, their "address" is compared.\r
 464 \r
 465                         var addressOfThis = this.getAddress(),\r
 466                                 addressOfOther = otherNode.getAddress(),\r
 467                                 minLevel = Math.min( addressOfThis.length, addressOfOther.length );\r
 468 \r
 469                                 // Determinate preceed/follow relationship.\r
 470                                 for ( var i = 0 ; i <= minLevel - 1 ; i++ )\r
 471                                 {\r
 472                                         if ( addressOfThis[ i ] != addressOfOther[ i ] )\r
 473                                         {\r
 474                                                 if ( i < minLevel )\r
 475                                                 {\r
 476                                                         return addressOfThis[ i ] < addressOfOther[ i ] ?\r
 477                                                             CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_FOLLOWING;\r
 478                                                 }\r
 479                                                 break;\r
 480                                         }\r
 481                                 }\r
 482 \r
 483                                 // Determinate contains/contained relationship.\r
 484                                 return ( addressOfThis.length < addressOfOther.length ) ?\r
 485                                                         CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING :\r
 486                                                         CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 487                 },\r
 488 \r
 489                 /**\r
 490                  * Gets the closest ancestor node of this node, specified by its node name.\r
 491                  * @param {String} name The node name of the ancestor node to search.\r
 492                  * @param {Boolean} [includeSelf] Whether to include the current\r
 493                  * node in the search.\r
 494                  * @returns {CKEDITOR.dom.node} The located ancestor node or null if not found.\r
 495                  * @example\r
 496                  * // Suppose we have the following HTML:\r
 497                  * // &lt;div id="outer"&gt;&lt;div id="inner"&gt;&lt;p&gt;&lt;b&gt;Some text&lt;/b&gt;&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;\r
 498                  * // If node == &lt;b&gt;\r
 499                  * ascendant = node.getAscendant( 'div' );      // ascendant == &lt;div id="inner"&gt\r
 500                  * ascendant = node.getAscendant( 'b' );        // ascendant == null\r
 501                  * ascendant = node.getAscendant( 'b', true );  // ascendant == &lt;b&gt;\r
 502                  */\r
 503                 getAscendant : function( name, includeSelf )\r
 504                 {\r
 505                         var $ = this.$;\r
 506 \r
 507                         if ( !includeSelf )\r
 508                                 $ = $.parentNode;\r
 509 \r
 510                         while ( $ )\r
 511                         {\r
 512                                 if ( $.nodeName && $.nodeName.toLowerCase() == name )\r
 513                                         return new CKEDITOR.dom.node( $ );\r
 514 \r
 515                                 $ = $.parentNode;\r
 516                         }\r
 517                         return null;\r
 518                 },\r
 519 \r
 520                 hasAscendant : function( name, includeSelf )\r
 521                 {\r
 522                         var $ = this.$;\r
 523 \r
 524                         if ( !includeSelf )\r
 525                                 $ = $.parentNode;\r
 526 \r
 527                         while ( $ )\r
 528                         {\r
 529                                 if ( $.nodeName && $.nodeName.toLowerCase() == name )\r
 530                                         return true;\r
 531 \r
 532                                 $ = $.parentNode;\r
 533                         }\r
 534                         return false;\r
 535                 },\r
 536 \r
 537                 move : function( target, toStart )\r
 538                 {\r
 539                         target.append( this.remove(), toStart );\r
 540                 },\r
 541 \r
 542                 /**\r
 543                  * Removes this node from the document DOM.\r
 544                  * @param {Boolean} [preserveChildren] Indicates that the children\r
 545                  *              elements must remain in the document, removing only the outer\r
 546                  *              tags.\r
 547                  * @example\r
 548                  * var element = CKEDITOR.dom.element.getById( 'MyElement' );\r
 549                  * <b>element.remove()</b>;\r
 550                  */\r
 551                 remove : function( preserveChildren )\r
 552                 {\r
 553                         var $ = this.$;\r
 554                         var parent = $.parentNode;\r
 555 \r
 556                         if ( parent )\r
 557                         {\r
 558                                 if ( preserveChildren )\r
 559                                 {\r
 560                                         // Move all children before the node.\r
 561                                         for ( var child ; ( child = $.firstChild ) ; )\r
 562                                         {\r
 563                                                 parent.insertBefore( $.removeChild( child ), $ );\r
 564                                         }\r
 565                                 }\r
 566 \r
 567                                 parent.removeChild( $ );\r
 568                         }\r
 569 \r
 570                         return this;\r
 571                 },\r
 572 \r
 573                 replace : function( nodeToReplace )\r
 574                 {\r
 575                         this.insertBefore( nodeToReplace );\r
 576                         nodeToReplace.remove();\r
 577                 },\r
 578 \r
 579                 trim : function()\r
 580                 {\r
 581                         this.ltrim();\r
 582                         this.rtrim();\r
 583                 },\r
 584 \r
 585                 ltrim : function()\r
 586                 {\r
 587                         var child;\r
 588                         while ( this.getFirst && ( child = this.getFirst() ) )\r
 589                         {\r
 590                                 if ( child.type == CKEDITOR.NODE_TEXT )\r
 591                                 {\r
 592                                         var trimmed = CKEDITOR.tools.ltrim( child.getText() ),\r
 593                                                 originalLength = child.getLength();\r
 594 \r
 595                                         if ( !trimmed )\r
 596                                         {\r
 597                                                 child.remove();\r
 598                                                 continue;\r
 599                                         }\r
 600                                         else if ( trimmed.length < originalLength )\r
 601                                         {\r
 602                                                 child.split( originalLength - trimmed.length );\r
 603 \r
 604                                                 // IE BUG: child.remove() may raise JavaScript errors here. (#81)\r
 605                                                 this.$.removeChild( this.$.firstChild );\r
 606                                         }\r
 607                                 }\r
 608                                 break;\r
 609                         }\r
 610                 },\r
 611 \r
 612                 rtrim : function()\r
 613                 {\r
 614                         var child;\r
 615                         while ( this.getLast && ( child = this.getLast() ) )\r
 616                         {\r
 617                                 if ( child.type == CKEDITOR.NODE_TEXT )\r
 618                                 {\r
 619                                         var trimmed = CKEDITOR.tools.rtrim( child.getText() ),\r
 620                                                 originalLength = child.getLength();\r
 621 \r
 622                                         if ( !trimmed )\r
 623                                         {\r
 624                                                 child.remove();\r
 625                                                 continue;\r
 626                                         }\r
 627                                         else if ( trimmed.length < originalLength )\r
 628                                         {\r
 629                                                 child.split( trimmed.length );\r
 630 \r
 631                                                 // IE BUG: child.getNext().remove() may raise JavaScript errors here.\r
 632                                                 // (#81)\r
 633                                                 this.$.lastChild.parentNode.removeChild( this.$.lastChild );\r
 634                                         }\r
 635                                 }\r
 636                                 break;\r
 637                         }\r
 638 \r
 639                         if ( !CKEDITOR.env.ie && !CKEDITOR.env.opera )\r
 640                         {\r
 641                                 child = this.$.lastChild;\r
 642 \r
 643                                 if ( child && child.type == 1 && child.nodeName.toLowerCase() == 'br' )\r
 644                                 {\r
 645                                         // Use "eChildNode.parentNode" instead of "node" to avoid IE bug (#324).\r
 646                                         child.parentNode.removeChild( child ) ;\r
 647                                 }\r
 648                         }\r
 649                 },\r
 650 \r
 651                 /**\r
 652                  * Checks is this node is read-only (should not be changed). It\r
 653                  * additionaly returns the element, if any, which defines the read-only\r
 654                  * state of this node. It may be the node itself or any of its parent\r
 655                  * nodes.\r
 656                  * @returns {CKEDITOR.dom.element|Boolean} An element containing\r
 657                  *              read-only attributes or "false" if none is found.\r
 658                  * @since 3.5\r
 659                  * @example\r
 660                  * // For the following HTML:\r
 661                  * // &lt;div contenteditable="false"&gt;Some &lt;b&gt;text&lt;/b&gt;&lt;/div&gt;\r
 662                  *\r
 663                  * // If "ele" is the above &lt;div&gt;\r
 664                  * ele.isReadOnly();  // the &lt;div&gt; element\r
 665                  *\r
 666                  * // If "ele" is the above &lt;b&gt;\r
 667                  * ele.isReadOnly();  // the &lt;div&gt; element\r
 668                  */\r
 669                 isReadOnly : function()\r
 670                 {\r
 671                         var current = this;\r
 672                         while( current )\r
 673                         {\r
 674                                 if ( current.type == CKEDITOR.NODE_ELEMENT )\r
 675                                 {\r
 676                                         if ( current.is( 'body' ) || !!current.data( 'cke-editable' ) )\r
 677                                                 break;\r
 678 \r
 679                                         if ( current.getAttribute( 'contentEditable' ) == 'false' )\r
 680                                                 return current;\r
 681                                         else if ( current.getAttribute( 'contentEditable' ) == 'true' )\r
 682                                                 break;\r
 683                                 }\r
 684                                 current = current.getParent();\r
 685                         }\r
 686 \r
 687                         return false;\r
 688                 }\r
 689         }\r
 690 );\r