_source/core/htmlparser/fragment.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  * A lightweight representation of an HTML DOM structure.\r
   8  * @constructor\r
   9  * @example\r
  10  */\r
  11 CKEDITOR.htmlParser.fragment = function()\r
  12 {\r
  13         /**\r
  14          * The nodes contained in the root of this fragment.\r
  15          * @type Array\r
  16          * @example\r
  17          * var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<b>Sample</b> Text' );\r
  18          * alert( fragment.children.length );  "2"\r
  19          */\r
  20         this.children = [];\r
  21 \r
  22         /**\r
  23          * Get the fragment parent. Should always be null.\r
  24          * @type Object\r
  25          * @default null\r
  26          * @example\r
  27          */\r
  28         this.parent = null;\r
  29 \r
  30         /** @private */\r
  31         this._ =\r
  32         {\r
  33                 isBlockLike : true,\r
  34                 hasInlineStarted : false\r
  35         };\r
  36 };\r
  37 \r
  38 (function()\r
  39 {\r
  40         // Elements which the end tag is marked as optional in the HTML 4.01 DTD\r
  41         // (expect empty elements).\r
  42         var optionalClose = {colgroup:1,dd:1,dt:1,li:1,option:1,p:1,td:1,tfoot:1,th:1,thead:1,tr:1};\r
  43 \r
  44         // Block-level elements whose internal structure should be respected during\r
  45         // parser fixing.\r
  46         var nonBreakingBlocks = CKEDITOR.tools.extend(\r
  47                         {table:1,ul:1,ol:1,dl:1},\r
  48                         CKEDITOR.dtd.table, CKEDITOR.dtd.ul, CKEDITOR.dtd.ol, CKEDITOR.dtd.dl ),\r
  49                 listBlocks = CKEDITOR.dtd.$list, listItems = CKEDITOR.dtd.$listItem;\r
  50 \r
  51         /**\r
  52          * Creates a {@link CKEDITOR.htmlParser.fragment} from an HTML string.\r
  53          * @param {String} fragmentHtml The HTML to be parsed, filling the fragment.\r
  54          * @param {Number} [fixForBody=false] Wrap body with specified element if needed.\r
  55          * @returns CKEDITOR.htmlParser.fragment The fragment created.\r
  56          * @example\r
  57          * var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<b>Sample</b> Text' );\r
  58          * alert( fragment.children[0].name );  "b"\r
  59          * alert( fragment.children[1].value );  " Text"\r
  60          */\r
  61         CKEDITOR.htmlParser.fragment.fromHtml = function( fragmentHtml, fixForBody )\r
  62         {\r
  63                 var parser = new CKEDITOR.htmlParser(),\r
  64                         html = [],\r
  65                         fragment = new CKEDITOR.htmlParser.fragment(),\r
  66                         pendingInline = [],\r
  67                         currentNode = fragment,\r
  68                     // Indicate we're inside a <pre> element, spaces should be touched differently.\r
  69                         inPre = false,\r
  70                         returnPoint;\r
  71 \r
  72                 function checkPending( newTagName )\r
  73                 {\r
  74                         if ( pendingInline.length > 0 )\r
  75                         {\r
  76                                 for ( var i = 0 ; i < pendingInline.length ; i++ )\r
  77                                 {\r
  78                                         var pendingElement = pendingInline[ i ],\r
  79                                                 pendingName = pendingElement.name,\r
  80                                                 pendingDtd = CKEDITOR.dtd[ pendingName ],\r
  81                                                 currentDtd = currentNode.name && CKEDITOR.dtd[ currentNode.name ];\r
  82 \r
  83                                         if ( ( !currentDtd || currentDtd[ pendingName ] ) && ( !newTagName || !pendingDtd || pendingDtd[ newTagName ] || !CKEDITOR.dtd[ newTagName ] ) )\r
  84                                         {\r
  85                                                 // Get a clone for the pending element.\r
  86                                                 pendingElement = pendingElement.clone();\r
  87 \r
  88                                                 // Add it to the current node and make it the current,\r
  89                                                 // so the new element will be added inside of it.\r
  90                                                 pendingElement.parent = currentNode;\r
  91                                                 currentNode = pendingElement;\r
  92 \r
  93                                                 // Remove the pending element (back the index by one\r
  94                                                 // to properly process the next entry).\r
  95                                                 pendingInline.splice( i, 1 );\r
  96                                                 i--;\r
  97                                         }\r
  98                                 }\r
  99                         }\r
 100                 }\r
 101 \r
 102                 function addElement( element, target, enforceCurrent )\r
 103                 {\r
 104                         target = target || currentNode || fragment;\r
 105 \r
 106                         // If the target is the fragment and this element can't go inside\r
 107                         // body (if fixForBody).\r
 108                         if ( fixForBody && !target.type )\r
 109                         {\r
 110                                 var elementName, realElementName;\r
 111                                 if ( element.attributes\r
 112                                          && ( realElementName =\r
 113                                                   element.attributes[ '_cke_real_element_type' ] ) )\r
 114                                         elementName = realElementName;\r
 115                                 else\r
 116                                         elementName =  element.name;\r
 117                                 if ( elementName\r
 118                                                 && !( elementName in CKEDITOR.dtd.$body )\r
 119                                                 && !( elementName in CKEDITOR.dtd.$nonBodyContent )  )\r
 120                                 {\r
 121                                         var savedCurrent = currentNode;\r
 122 \r
 123                                         // Create a <p> in the fragment.\r
 124                                         currentNode = target;\r
 125                                         parser.onTagOpen( fixForBody, {} );\r
 126 \r
 127                                         // The new target now is the <p>.\r
 128                                         target = currentNode;\r
 129 \r
 130                                         if ( enforceCurrent )\r
 131                                                 currentNode = savedCurrent;\r
 132                                 }\r
 133                         }\r
 134 \r
 135                         // Rtrim empty spaces on block end boundary. (#3585)\r
 136                         if ( element._.isBlockLike\r
 137                                  && element.name != 'pre' )\r
 138                         {\r
 139 \r
 140                                 var length = element.children.length,\r
 141                                         lastChild = element.children[ length - 1 ],\r
 142                                         text;\r
 143                                 if ( lastChild && lastChild.type == CKEDITOR.NODE_TEXT )\r
 144                                 {\r
 145                                         if ( !( text = CKEDITOR.tools.rtrim( lastChild.value ) ) )\r
 146                                                 element.children.length = length -1;\r
 147                                         else\r
 148                                                 lastChild.value = text;\r
 149                                 }\r
 150                         }\r
 151 \r
 152                         target.add( element );\r
 153 \r
 154                         if ( element.returnPoint )\r
 155                         {\r
 156                                 currentNode = element.returnPoint;\r
 157                                 delete element.returnPoint;\r
 158                         }\r
 159                 }\r
 160 \r
 161                 parser.onTagOpen = function( tagName, attributes, selfClosing )\r
 162                 {\r
 163                         var element = new CKEDITOR.htmlParser.element( tagName, attributes );\r
 164 \r
 165                         // "isEmpty" will be always "false" for unknown elements, so we\r
 166                         // must force it if the parser has identified it as a selfClosing tag.\r
 167                         if ( element.isUnknown && selfClosing )\r
 168                                 element.isEmpty = true;\r
 169 \r
 170                         // This is a tag to be removed if empty, so do not add it immediately.\r
 171                         if ( CKEDITOR.dtd.$removeEmpty[ tagName ] )\r
 172                         {\r
 173                                 pendingInline.push( element );\r
 174                                 return;\r
 175                         }\r
 176                         else if ( tagName == 'pre' )\r
 177                                 inPre = true;\r
 178                         else if ( tagName == 'br' && inPre )\r
 179                         {\r
 180                                 currentNode.add( new CKEDITOR.htmlParser.text( '\n' ) );\r
 181                                 return;\r
 182                         }\r
 183 \r
 184                         var currentName = currentNode.name;\r
 185 \r
 186                         var currentDtd = currentName\r
 187                                 && ( CKEDITOR.dtd[ currentName ]\r
 188                                         || ( currentNode._.isBlockLike ? CKEDITOR.dtd.div : CKEDITOR.dtd.span ) );\r
 189 \r
 190                         // If the element cannot be child of the current element.\r
 191                         if ( currentDtd   // Fragment could receive any elements.\r
 192                                  && !element.isUnknown && !currentNode.isUnknown && !currentDtd[ tagName ] )\r
 193                         {\r
 194 \r
 195                                 var reApply = false,\r
 196                                         addPoint;   // New position to start adding nodes.\r
 197 \r
 198                                 // Fixing malformed nested lists by moving it into a previous list item. (#3828)\r
 199                                 if( tagName in listBlocks\r
 200                                         && currentName in listBlocks )\r
 201                                 {\r
 202                                         var children = currentNode.children,\r
 203                                                 lastChild = children[ children.length - 1 ];\r
 204 \r
 205                                         // Establish the list item if it's not existed.\r
 206                                         if ( !( lastChild && lastChild.name in listItems ) )\r
 207                                                 addElement( ( lastChild = new CKEDITOR.htmlParser.element( 'li' ) ), currentNode );\r
 208 \r
 209                                         returnPoint = currentNode, addPoint = lastChild;\r
 210                                 }\r
 211                                 // If the element name is the same as the current element name,\r
 212                                 // then just close the current one and append the new one to the\r
 213                                 // parent. This situation usually happens with <p>, <li>, <dt> and\r
 214                                 // <dd>, specially in IE. Do not enter in this if block in this case.\r
 215                                 else if ( tagName == currentName )\r
 216                                 {\r
 217                                         addElement( currentNode, currentNode.parent );\r
 218                                 }\r
 219                                 else\r
 220                                 {\r
 221                                         if ( nonBreakingBlocks[ currentName ] )\r
 222                                         {\r
 223                                                 if ( !returnPoint )\r
 224                                                         returnPoint = currentNode;\r
 225                                         }\r
 226                                         else\r
 227                                         {\r
 228                                                 addElement( currentNode, currentNode.parent, true );\r
 229 \r
 230                                                 if ( !optionalClose[ currentName ] )\r
 231                                                 {\r
 232                                                         // The current element is an inline element, which\r
 233                                                         // cannot hold the new one. Put it in the pending list,\r
 234                                                         // and try adding the new one after it.\r
 235                                                         pendingInline.unshift( currentNode );\r
 236                                                 }\r
 237                                         }\r
 238 \r
 239                                         reApply = true;\r
 240                                 }\r
 241 \r
 242                                 if( addPoint )\r
 243                                         currentNode = addPoint;\r
 244                                 // Try adding it to the return point, or the parent element.\r
 245                                 else\r
 246                                         currentNode = currentNode.returnPoint || currentNode.parent;\r
 247 \r
 248                                 if ( reApply )\r
 249                                 {\r
 250                                         parser.onTagOpen.apply( this, arguments );\r
 251                                         return;\r
 252                                 }\r
 253                         }\r
 254 \r
 255                         checkPending( tagName );\r
 256 \r
 257                         element.parent = currentNode;\r
 258                         element.returnPoint = returnPoint;\r
 259                         returnPoint = 0;\r
 260 \r
 261                         if ( element.isEmpty )\r
 262                                 addElement( element );\r
 263                         else\r
 264                                 currentNode = element;\r
 265                 };\r
 266 \r
 267                 parser.onTagClose = function( tagName )\r
 268                 {\r
 269                         // Check if there is any pending tag to be closed.\r
 270                         for ( var i = pendingInline.length - 1 ; i >= 0 ; i-- )\r
 271                         {\r
 272                                 // If found, just remove it from the list.\r
 273                                 if ( tagName == pendingInline[ i ].name )\r
 274                                 {\r
 275                                         pendingInline.splice( i, 1 );\r
 276                                         return;\r
 277                                 }\r
 278                         }\r
 279 \r
 280                         var pendingAdd = [],\r
 281                                 newPendingInline = [],\r
 282                                 candidate = currentNode;\r
 283 \r
 284                         while ( candidate.type && candidate.name != tagName )\r
 285                         {\r
 286                                 // If this is an inline element, add it to the pending list, if we're\r
 287                                 // really closing one of the parents element later, they will continue\r
 288                                 // after it.\r
 289                                 if ( !candidate._.isBlockLike )\r
 290                                         newPendingInline.unshift( candidate );\r
 291 \r
 292                                 // This node should be added to it's parent at this point. But,\r
 293                                 // it should happen only if the closing tag is really closing\r
 294                                 // one of the nodes. So, for now, we just cache it.\r
 295                                 pendingAdd.push( candidate );\r
 296 \r
 297                                 candidate = candidate.parent;\r
 298                         }\r
 299 \r
 300                         if ( candidate.type )\r
 301                         {\r
 302                                 // Add all elements that have been found in the above loop.\r
 303                                 for ( i = 0 ; i < pendingAdd.length ; i++ )\r
 304                                 {\r
 305                                         var node = pendingAdd[ i ];\r
 306                                         addElement( node, node.parent );\r
 307                                 }\r
 308 \r
 309                                 currentNode = candidate;\r
 310 \r
 311                                 if( currentNode.name == 'pre' )\r
 312                                         inPre = false;\r
 313 \r
 314                                 addElement( candidate, candidate.parent );\r
 315 \r
 316                                 // The parent should start receiving new nodes now, except if\r
 317                                 // addElement changed the currentNode.\r
 318                                 if ( candidate == currentNode )\r
 319                                         currentNode = currentNode.parent;\r
 320 \r
 321                                 pendingInline = pendingInline.concat( newPendingInline );\r
 322                         }\r
 323 \r
 324                         if( tagName == 'body' )\r
 325                                 fixForBody = false;\r
 326                 };\r
 327 \r
 328                 parser.onText = function( text )\r
 329                 {\r
 330                         // Trim empty spaces at beginning of element contents except <pre>.\r
 331                         if ( !currentNode._.hasInlineStarted && !inPre )\r
 332                         {\r
 333                                 text = CKEDITOR.tools.ltrim( text );\r
 334 \r
 335                                 if ( text.length === 0 )\r
 336                                         return;\r
 337                         }\r
 338 \r
 339                         checkPending();\r
 340 \r
 341                         if ( fixForBody\r
 342                                  && ( !currentNode.type || currentNode.name == 'body' )\r
 343                                  && CKEDITOR.tools.trim( text ) )\r
 344                         {\r
 345                                 this.onTagOpen( fixForBody, {} );\r
 346                         }\r
 347 \r
 348                         // Shrinking consequential spaces into one single for all elements\r
 349                         // text contents.\r
 350                         if ( !inPre )\r
 351                                 text = text.replace( /[\t\r\n ]{2,}|[\t\r\n]/g, ' ' );\r
 352 \r
 353                         currentNode.add( new CKEDITOR.htmlParser.text( text ) );\r
 354                 };\r
 355 \r
 356                 parser.onCDATA = function( cdata )\r
 357                 {\r
 358                         currentNode.add( new CKEDITOR.htmlParser.cdata( cdata ) );\r
 359                 };\r
 360 \r
 361                 parser.onComment = function( comment )\r
 362                 {\r
 363                         currentNode.add( new CKEDITOR.htmlParser.comment( comment ) );\r
 364                 };\r
 365 \r
 366                 // Parse it.\r
 367                 parser.parse( fragmentHtml );\r
 368 \r
 369                 // Close all pending nodes.\r
 370                 while ( currentNode.type )\r
 371                 {\r
 372                         var parent = currentNode.parent,\r
 373                                 node = currentNode;\r
 374 \r
 375                         if ( fixForBody\r
 376                                  && ( !parent.type || parent.name == 'body' )\r
 377                                  && !CKEDITOR.dtd.$body[ node.name ] )\r
 378                         {\r
 379                                 currentNode = parent;\r
 380                                 parser.onTagOpen( fixForBody, {} );\r
 381                                 parent = currentNode;\r
 382                         }\r
 383 \r
 384                         parent.add( node );\r
 385                         currentNode = parent;\r
 386                 }\r
 387 \r
 388                 return fragment;\r
 389         };\r
 390 \r
 391         CKEDITOR.htmlParser.fragment.prototype =\r
 392         {\r
 393                 /**\r
 394                  * Adds a node to this fragment.\r
 395                  * @param {Object} node The node to be added. It can be any of of the\r
 396                  *              following types: {@link CKEDITOR.htmlParser.element},\r
 397                  *              {@link CKEDITOR.htmlParser.text} and\r
 398                  *              {@link CKEDITOR.htmlParser.comment}.\r
 399                  * @example\r
 400                  */\r
 401                 add : function( node )\r
 402                 {\r
 403                         var len = this.children.length,\r
 404                                 previous = len > 0 && this.children[ len - 1 ] || null;\r
 405 \r
 406                         if ( previous )\r
 407                         {\r
 408                                 // If the block to be appended is following text, trim spaces at\r
 409                                 // the right of it.\r
 410                                 if ( node._.isBlockLike && previous.type == CKEDITOR.NODE_TEXT )\r
 411                                 {\r
 412                                         previous.value = CKEDITOR.tools.rtrim( previous.value );\r
 413 \r
 414                                         // If we have completely cleared the previous node.\r
 415                                         if ( previous.value.length === 0 )\r
 416                                         {\r
 417                                                 // Remove it from the list and add the node again.\r
 418                                                 this.children.pop();\r
 419                                                 this.add( node );\r
 420                                                 return;\r
 421                                         }\r
 422                                 }\r
 423 \r
 424                                 previous.next = node;\r
 425                         }\r
 426 \r
 427                         node.previous = previous;\r
 428                         node.parent = this;\r
 429 \r
 430                         this.children.push( node );\r
 431 \r
 432                         this._.hasInlineStarted = node.type == CKEDITOR.NODE_TEXT || ( node.type == CKEDITOR.NODE_ELEMENT && !node._.isBlockLike );\r
 433                 },\r
 434 \r
 435                 /**\r
 436                  * Writes the fragment HTML to a CKEDITOR.htmlWriter.\r
 437                  * @param {CKEDITOR.htmlWriter} writer The writer to which write the HTML.\r
 438                  * @example\r
 439                  * var writer = new CKEDITOR.htmlWriter();\r
 440                  * var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '&lt;P&gt;&lt;B&gt;Example' );\r
 441                  * fragment.writeHtml( writer )\r
 442                  * alert( writer.getHtml() );  "&lt;p&gt;&lt;b&gt;Example&lt;/b&gt;&lt;/p&gt;"\r
 443                  */\r
 444                 writeHtml : function( writer, filter )\r
 445                 {\r
 446                         var isChildrenFiltered;\r
 447                         this.filterChildren = function()\r
 448                         {\r
 449                                 var writer = new CKEDITOR.htmlParser.basicWriter();\r
 450                                 this.writeChildrenHtml.call( this, writer, filter, true );\r
 451                                 var html = writer.getHtml();\r
 452                                 this.children = new CKEDITOR.htmlParser.fragment.fromHtml( html ).children;\r
 453                                 isChildrenFiltered = 1;\r
 454                         };\r
 455 \r
 456                         // Filtering the root fragment before anything else.\r
 457                         !this.name && filter && filter.onFragment( this );\r
 458 \r
 459                         this.writeChildrenHtml( writer, isChildrenFiltered ? null : filter );\r
 460                 },\r
 461 \r
 462                 writeChildrenHtml : function( writer, filter )\r
 463                 {\r
 464                         for ( var i = 0 ; i < this.children.length ; i++ )\r
 465                                 this.children[i].writeHtml( writer, filter );\r
 466                 }\r
 467         };\r
 468 })();\r