_source/core/dom/node.js

   1 /*\r
   2 Copyright (c) 2003-2012, 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  * an instance of a class that inherits from 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                 var type = domNode.nodeType == CKEDITOR.NODE_DOCUMENT ? 'document'\r
  27                         : domNode.nodeType == CKEDITOR.NODE_ELEMENT ? 'element'\r
  28                         : domNode.nodeType == CKEDITOR.NODE_TEXT ? 'text'\r
  29                         : domNode.nodeType == CKEDITOR.NODE_COMMENT ? 'comment'\r
  30                         : 'domObject';  // Call the base constructor otherwise.\r
  31 \r
  32                 return new CKEDITOR.dom[ type ]( domNode );\r
  33         }\r
  34 \r
  35         return this;\r
  36 };\r
  37 \r
  38 CKEDITOR.dom.node.prototype = new CKEDITOR.dom.domObject();\r
  39 \r
  40 /**\r
  41  * Element node type.\r
  42  * @constant\r
  43  * @example\r
  44  */\r
  45 CKEDITOR.NODE_ELEMENT = 1;\r
  46 \r
  47 /**\r
  48  * Document node type.\r
  49  * @constant\r
  50  * @example\r
  51  */\r
  52 CKEDITOR.NODE_DOCUMENT = 9;\r
  53 \r
  54 /**\r
  55  * Text node type.\r
  56  * @constant\r
  57  * @example\r
  58  */\r
  59 CKEDITOR.NODE_TEXT = 3;\r
  60 \r
  61 /**\r
  62  * Comment node type.\r
  63  * @constant\r
  64  * @example\r
  65  */\r
  66 CKEDITOR.NODE_COMMENT = 8;\r
  67 \r
  68 CKEDITOR.NODE_DOCUMENT_FRAGMENT = 11;\r
  69 \r
  70 CKEDITOR.POSITION_IDENTICAL = 0;\r
  71 CKEDITOR.POSITION_DISCONNECTED = 1;\r
  72 CKEDITOR.POSITION_FOLLOWING = 2;\r
  73 CKEDITOR.POSITION_PRECEDING = 4;\r
  74 CKEDITOR.POSITION_IS_CONTAINED = 8;\r
  75 CKEDITOR.POSITION_CONTAINS = 16;\r
  76 \r
  77 CKEDITOR.tools.extend( CKEDITOR.dom.node.prototype,\r
  78         /** @lends CKEDITOR.dom.node.prototype */\r
  79         {\r
  80                 /**\r
  81                  * Makes this node a child of another element.\r
  82                  * @param {CKEDITOR.dom.element} element The target element to which\r
  83                  *              this node will be appended.\r
  84                  * @returns {CKEDITOR.dom.element} The target element.\r
  85                  * @example\r
  86                  * var p = new CKEDITOR.dom.element( 'p' );\r
  87                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
  88                  * strong.appendTo( p );\r
  89                  *\r
  90                  * // result: "&lt;p&gt;&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;"\r
  91                  */\r
  92                 appendTo : function( element, toStart )\r
  93                 {\r
  94                         element.append( this, toStart );\r
  95                         return element;\r
  96                 },\r
  97 \r
  98                 clone : function( includeChildren, cloneId )\r
  99                 {\r
 100                         var $clone = this.$.cloneNode( includeChildren );\r
 101 \r
 102                         var removeIds = function( node )\r
 103                         {\r
 104                                 if ( node.nodeType != CKEDITOR.NODE_ELEMENT )\r
 105                                         return;\r
 106 \r
 107                                 if ( !cloneId )\r
 108                                         node.removeAttribute( 'id', false );\r
 109                                 node.removeAttribute( 'data-cke-expando', false );\r
 110 \r
 111                                 if ( includeChildren )\r
 112                                 {\r
 113                                         var childs = node.childNodes;\r
 114                                         for ( var i=0; i < childs.length; i++ )\r
 115                                                 removeIds( childs[ i ] );\r
 116                                 }\r
 117                         };\r
 118 \r
 119                         // The "id" attribute should never be cloned to avoid duplication.\r
 120                         removeIds( $clone );\r
 121 \r
 122                         return new CKEDITOR.dom.node( $clone );\r
 123                 },\r
 124 \r
 125                 hasPrevious : function()\r
 126                 {\r
 127                         return !!this.$.previousSibling;\r
 128                 },\r
 129 \r
 130                 hasNext : function()\r
 131                 {\r
 132                         return !!this.$.nextSibling;\r
 133                 },\r
 134 \r
 135                 /**\r
 136                  * Inserts this element after a node.\r
 137                  * @param {CKEDITOR.dom.node} node The node that will precede this element.\r
 138                  * @returns {CKEDITOR.dom.node} The node preceding this one after\r
 139                  *              insertion.\r
 140                  * @example\r
 141                  * var em = new CKEDITOR.dom.element( 'em' );\r
 142                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
 143                  * strong.insertAfter( em );\r
 144                  *\r
 145                  * // result: "&lt;em&gt;&lt;/em&gt;&lt;strong&gt;&lt;/strong&gt;"\r
 146                  */\r
 147                 insertAfter : function( node )\r
 148                 {\r
 149                         node.$.parentNode.insertBefore( this.$, node.$.nextSibling );\r
 150                         return node;\r
 151                 },\r
 152 \r
 153                 /**\r
 154                  * Inserts this element before a node.\r
 155                  * @param {CKEDITOR.dom.node} node The node that will succeed this element.\r
 156                  * @returns {CKEDITOR.dom.node} The node being inserted.\r
 157                  * @example\r
 158                  * var em = new CKEDITOR.dom.element( 'em' );\r
 159                  * var strong = new CKEDITOR.dom.element( 'strong' );\r
 160                  * strong.insertBefore( em );\r
 161                  *\r
 162                  * // result: "&lt;strong&gt;&lt;/strong&gt;&lt;em&gt;&lt;/em&gt;"\r
 163                  */\r
 164                 insertBefore : function( node )\r
 165                 {\r
 166                         node.$.parentNode.insertBefore( this.$, node.$ );\r
 167                         return node;\r
 168                 },\r
 169 \r
 170                 insertBeforeMe : function( node )\r
 171                 {\r
 172                         this.$.parentNode.insertBefore( node.$, this.$ );\r
 173                         return node;\r
 174                 },\r
 175 \r
 176                 /**\r
 177                  * Retrieves a uniquely identifiable tree address for this node.\r
 178                  * The tree address returned is an array of integers, with each integer\r
 179                  * indicating a child index of a DOM node, starting from\r
 180                  * <code>document.documentElement</code>.\r
 181                  *\r
 182                  * For example, assuming <code>&lt;body&gt;</code> is the second child\r
 183                  * of <code>&lt;html&gt;</code> (<code>&lt;head&gt;</code> being the first),\r
 184                  * and we would like to address the third child under the\r
 185                  * fourth child of <code>&lt;body&gt;</code>, the tree address returned would be:\r
 186                  * [1, 3, 2]\r
 187                  *\r
 188                  * The tree address cannot be used for finding back the DOM tree node once\r
 189                  * the DOM tree structure has been modified.\r
 190                  */\r
 191                 getAddress : function( normalized )\r
 192                 {\r
 193                         var address = [];\r
 194                         var $documentElement = this.getDocument().$.documentElement;\r
 195                         var node = this.$;\r
 196 \r
 197                         while ( node && node != $documentElement )\r
 198                         {\r
 199                                 var parentNode = node.parentNode;\r
 200 \r
 201                                 if ( parentNode )\r
 202                                 {\r
 203                                         // Get the node index. For performance, call getIndex\r
 204                                         // directly, instead of creating a new node object.\r
 205                                         address.unshift( this.getIndex.call( { $ : node }, normalized ) );\r
 206                                 }\r
 207 \r
 208                                 node = parentNode;\r
 209                         }\r
 210 \r
 211                         return address;\r
 212                 },\r
 213 \r
 214                 /**\r
 215                  * Gets the document containing this element.\r
 216                  * @returns {CKEDITOR.dom.document} The document.\r
 217                  * @example\r
 218                  * var element = CKEDITOR.document.getById( 'example' );\r
 219                  * alert( <strong>element.getDocument().equals( CKEDITOR.document )</strong> );  // "true"\r
 220                  */\r
 221                 getDocument : function()\r
 222                 {\r
 223                         return new CKEDITOR.dom.document( this.$.ownerDocument || this.$.parentNode.ownerDocument );\r
 224                 },\r
 225 \r
 226                 getIndex : function( normalized )\r
 227                 {\r
 228                         // Attention: getAddress depends on this.$\r
 229 \r
 230                         var current = this.$,\r
 231                                 index = 0;\r
 232 \r
 233                         while ( ( current = current.previousSibling ) )\r
 234                         {\r
 235                                 // When normalizing, do not count it if this is an\r
 236                                 // empty text node or if it's a text node following another one.\r
 237                                 if ( normalized && current.nodeType == 3 &&\r
 238                                          ( !current.nodeValue.length ||\r
 239                                            ( current.previousSibling && current.previousSibling.nodeType == 3 ) ) )\r
 240                                 {\r
 241                                         continue;\r
 242                                 }\r
 243 \r
 244                                 index++;\r
 245                         }\r
 246 \r
 247                         return index;\r
 248                 },\r
 249 \r
 250                 getNextSourceNode : function( startFromSibling, nodeType, guard )\r
 251                 {\r
 252                         // If "guard" is a node, transform it in a function.\r
 253                         if ( guard && !guard.call )\r
 254                         {\r
 255                                 var guardNode = guard;\r
 256                                 guard = function( node )\r
 257                                 {\r
 258                                         return !node.equals( guardNode );\r
 259                                 };\r
 260                         }\r
 261 \r
 262                         var node = ( !startFromSibling && this.getFirst && this.getFirst() ),\r
 263                                 parent;\r
 264 \r
 265                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 266                         // send the 'moving out' signal even we don't actually dive into.\r
 267                         if ( !node )\r
 268                         {\r
 269                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 270                                         return null;\r
 271                                 node = this.getNext();\r
 272                         }\r
 273 \r
 274                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 275                         {\r
 276                                 // The guard check sends the "true" paramenter to indicate that\r
 277                                 // we are moving "out" of the element.\r
 278                                 if ( guard && guard( parent, true ) === false )\r
 279                                         return null;\r
 280 \r
 281                                 node = parent.getNext();\r
 282                         }\r
 283 \r
 284                         if ( !node )\r
 285                                 return null;\r
 286 \r
 287                         if ( guard && guard( node ) === false )\r
 288                                 return null;\r
 289 \r
 290                         if ( nodeType && nodeType != node.type )\r
 291                                 return node.getNextSourceNode( false, nodeType, guard );\r
 292 \r
 293                         return node;\r
 294                 },\r
 295 \r
 296                 getPreviousSourceNode : function( startFromSibling, nodeType, guard )\r
 297                 {\r
 298                         if ( guard && !guard.call )\r
 299                         {\r
 300                                 var guardNode = guard;\r
 301                                 guard = function( node )\r
 302                                 {\r
 303                                         return !node.equals( guardNode );\r
 304                                 };\r
 305                         }\r
 306 \r
 307                         var node = ( !startFromSibling && this.getLast && this.getLast() ),\r
 308                                 parent;\r
 309 \r
 310                         // Guarding when we're skipping the current element( no children or 'startFromSibling' ).\r
 311                         // send the 'moving out' signal even we don't actually dive into.\r
 312                         if ( !node )\r
 313                         {\r
 314                                 if ( this.type == CKEDITOR.NODE_ELEMENT && guard && guard( this, true ) === false )\r
 315                                         return null;\r
 316                                 node = this.getPrevious();\r
 317                         }\r
 318 \r
 319                         while ( !node && ( parent = ( parent || this ).getParent() ) )\r
 320                         {\r
 321                                 // The guard check sends the "true" paramenter to indicate that\r
 322                                 // we are moving "out" of the element.\r
 323                                 if ( guard && guard( parent, true ) === false )\r
 324                                         return null;\r
 325 \r
 326                                 node = parent.getPrevious();\r
 327                         }\r
 328 \r
 329                         if ( !node )\r
 330                                 return null;\r
 331 \r
 332                         if ( guard && guard( node ) === false )\r
 333                                 return null;\r
 334 \r
 335                         if ( nodeType && node.type != nodeType )\r
 336                                 return node.getPreviousSourceNode( false, nodeType, guard );\r
 337 \r
 338                         return node;\r
 339                 },\r
 340 \r
 341                 getPrevious : function( evaluator )\r
 342                 {\r
 343                         var previous = this.$, retval;\r
 344                         do\r
 345                         {\r
 346                                 previous = previous.previousSibling;\r
 347 \r
 348                                 // Avoid returning the doc type node.\r
 349                                 // http://www.w3.org/TR/REC-DOM-Level-1/level-one-core.html#ID-412266927\r
 350                                 retval = previous && previous.nodeType != 10 && new CKEDITOR.dom.node( previous );\r
 351                         }\r
 352                         while ( retval && evaluator && !evaluator( retval ) )\r
 353                         return retval;\r
 354                 },\r
 355 \r
 356                 /**\r
 357                  * Gets the node that follows this element in its parent's child list.\r
 358                  * @param {Function} evaluator Filtering the result node.\r
 359                  * @returns {CKEDITOR.dom.node} The next node or null if not available.\r
 360                  * @example\r
 361                  * var element = CKEDITOR.dom.element.createFromHtml( '&lt;div&gt;&lt;b&gt;Example&lt;/b&gt; &lt;i&gt;next&lt;/i&gt;&lt;/div&gt;' );\r
 362                  * var first = <strong>element.getFirst().getNext()</strong>;\r
 363                  * alert( first.getName() );  // "i"\r
 364                  */\r
 365                 getNext : function( evaluator )\r
 366                 {\r
 367                         var next = this.$, retval;\r
 368                         do\r
 369                         {\r
 370                                 next = next.nextSibling;\r
 371                                 retval = next && new CKEDITOR.dom.node( next );\r
 372                         }\r
 373                         while ( retval && evaluator && !evaluator( retval ) )\r
 374                         return retval;\r
 375                 },\r
 376 \r
 377                 /**\r
 378                  * Gets the parent element for this node.\r
 379                  * @returns {CKEDITOR.dom.element} The parent element.\r
 380                  * @example\r
 381                  * var node = editor.document.getBody().getFirst();\r
 382                  * var parent = node.<strong>getParent()</strong>;\r
 383                  * alert( node.getName() );  // "body"\r
 384                  */\r
 385                 getParent : function()\r
 386                 {\r
 387                         var parent = this.$.parentNode;\r
 388                         return ( parent && parent.nodeType == 1 ) ? new CKEDITOR.dom.node( parent ) : null;\r
 389                 },\r
 390 \r
 391                 getParents : function( closerFirst )\r
 392                 {\r
 393                         var node = this;\r
 394                         var parents = [];\r
 395 \r
 396                         do\r
 397                         {\r
 398                                 parents[  closerFirst ? 'push' : 'unshift' ]( node );\r
 399                         }\r
 400                         while ( ( node = node.getParent() ) )\r
 401 \r
 402                         return parents;\r
 403                 },\r
 404 \r
 405                 getCommonAncestor : function( node )\r
 406                 {\r
 407                         if ( node.equals( this ) )\r
 408                                 return this;\r
 409 \r
 410                         if ( node.contains && node.contains( this ) )\r
 411                                 return node;\r
 412 \r
 413                         var start = this.contains ? this : this.getParent();\r
 414 \r
 415                         do\r
 416                         {\r
 417                                 if ( start.contains( node ) )\r
 418                                         return start;\r
 419                         }\r
 420                         while ( ( start = start.getParent() ) );\r
 421 \r
 422                         return null;\r
 423                 },\r
 424 \r
 425                 getPosition : function( otherNode )\r
 426                 {\r
 427                         var $ = this.$;\r
 428                         var $other = otherNode.$;\r
 429 \r
 430                         if ( $.compareDocumentPosition )\r
 431                                 return $.compareDocumentPosition( $other );\r
 432 \r
 433                         // IE and Safari have no support for compareDocumentPosition.\r
 434 \r
 435                         if ( $ == $other )\r
 436                                 return CKEDITOR.POSITION_IDENTICAL;\r
 437 \r
 438                         // Only element nodes support contains and sourceIndex.\r
 439                         if ( this.type == CKEDITOR.NODE_ELEMENT && otherNode.type == CKEDITOR.NODE_ELEMENT )\r
 440                         {\r
 441                                 if ( $.contains )\r
 442                                 {\r
 443                                         if ( $.contains( $other ) )\r
 444                                                 return CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING;\r
 445 \r
 446                                         if ( $other.contains( $ ) )\r
 447                                                 return CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 448                                 }\r
 449 \r
 450                                 if ( 'sourceIndex' in $ )\r
 451                                 {\r
 452                                         return ( $.sourceIndex < 0 || $other.sourceIndex < 0 ) ? CKEDITOR.POSITION_DISCONNECTED :\r
 453                                                 ( $.sourceIndex < $other.sourceIndex ) ? CKEDITOR.POSITION_PRECEDING :\r
 454                                                 CKEDITOR.POSITION_FOLLOWING;\r
 455                                 }\r
 456                         }\r
 457 \r
 458                         // For nodes that don't support compareDocumentPosition, contains\r
 459                         // or sourceIndex, their "address" is compared.\r
 460 \r
 461                         var addressOfThis = this.getAddress(),\r
 462                                 addressOfOther = otherNode.getAddress(),\r
 463                                 minLevel = Math.min( addressOfThis.length, addressOfOther.length );\r
 464 \r
 465                                 // Determinate preceed/follow relationship.\r
 466                                 for ( var i = 0 ; i <= minLevel - 1 ; i++ )\r
 467                                 {\r
 468                                         if ( addressOfThis[ i ] != addressOfOther[ i ] )\r
 469                                         {\r
 470                                                 if ( i < minLevel )\r
 471                                                 {\r
 472                                                         return addressOfThis[ i ] < addressOfOther[ i ] ?\r
 473                                                             CKEDITOR.POSITION_PRECEDING : CKEDITOR.POSITION_FOLLOWING;\r
 474                                                 }\r
 475                                                 break;\r
 476                                         }\r
 477                                 }\r
 478 \r
 479                                 // Determinate contains/contained relationship.\r
 480                                 return ( addressOfThis.length < addressOfOther.length ) ?\r
 481                                                         CKEDITOR.POSITION_CONTAINS + CKEDITOR.POSITION_PRECEDING :\r
 482                                                         CKEDITOR.POSITION_IS_CONTAINED + CKEDITOR.POSITION_FOLLOWING;\r
 483                 },\r
 484 \r
 485                 /**\r
 486                  * Gets the closest ancestor node of this node, specified by its name.\r
 487                  * @param {String} reference The name of the ancestor node to search or\r
 488                  *              an object with the node names to search for.\r
 489                  * @param {Boolean} [includeSelf] Whether to include the current\r
 490                  *              node in the search.\r
 491                  * @returns {CKEDITOR.dom.node} The located ancestor node or null if not found.\r
 492                  * @since 3.6.1\r
 493                  * @example\r
 494                  * // Suppose we have the following HTML structure:\r
 495                  * // &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
 496                  * // If node == &lt;b&gt;\r
 497                  * ascendant = node.getAscendant( 'div' );      // ascendant == &lt;div id="inner"&gt\r
 498                  * ascendant = node.getAscendant( 'b' );        // ascendant == null\r
 499                  * ascendant = node.getAscendant( 'b', true );  // ascendant == &lt;b&gt;\r
 500                  * ascendant = node.getAscendant( { div: 1, p: 1} );      // Searches for the first 'div' or 'p': ascendant == &lt;div id="inner"&gt\r
 501                  */\r
 502                 getAscendant : function( reference, includeSelf )\r
 503                 {\r
 504                         var $ = this.$,\r
 505                                 name;\r
 506 \r
 507                         if ( !includeSelf )\r
 508                                 $ = $.parentNode;\r
 509 \r
 510                         while ( $ )\r
 511                         {\r
 512                                 if ( $.nodeName && ( name = $.nodeName.toLowerCase(), ( typeof reference == 'string' ? name == reference : name in reference ) ) )\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                  * <strong>element.remove()</strong>;\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.$.lastChild;\r
 642 \r
 643                                 if ( child && child.type == 1 && child.nodeName.toLowerCase() == 'br' )\r
 644                                 {\r
 645                                         // Use "eChildNode.parentNode" instead of "node" to avoid IE bug (#324).\r
 646                                         child.parentNode.removeChild( child ) ;\r
 647                                 }\r
 648                         }\r
 649                 },\r
 650 \r
 651                 /**\r
 652                  * Checks if this node is read-only (should not be changed).\r
 653                  * @returns {Boolean}\r
 654                  * @since 3.5\r
 655                  * @example\r
 656                  * // For the following HTML:\r
 657                  * // &lt;div contenteditable="false"&gt;Some &lt;b&gt;text&lt;/b&gt;&lt;/div&gt;\r
 658                  *\r
 659                  * // If "ele" is the above &lt;div&gt;\r
 660                  * ele.isReadOnly();  // true\r
 661                  */\r
 662                 isReadOnly : function()\r
 663                 {\r
 664                         var element = this;\r
 665                         if ( this.type != CKEDITOR.NODE_ELEMENT )\r
 666                                 element = this.getParent();\r
 667 \r
 668                         if ( element && typeof element.$.isContentEditable != 'undefined' )\r
 669                                 return ! ( element.$.isContentEditable || element.data( 'cke-editable' ) );\r
 670                         else\r
 671                         {\r
 672                                 // Degrade for old browsers which don't support "isContentEditable", e.g. FF3\r
 673                                 var current = element;\r
 674                                 while( current )\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 true;\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
 691 );\r