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[ckeditor.git] / _source / plugins / htmldataprocessor / plugin.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 (function()\r
7 {\r
8         // Regex to scan for   at the end of blocks, which are actually placeholders.\r
9         // Safari transforms the   to \xa0. (#4172)\r
10         var tailNbspRegex = /^[\t\r\n ]*(?: |\xa0)$/;\r
11 \r
12         var protectedSourceMarker = '{cke_protected}';\r
13 \r
14         // Return the last non-space child node of the block (#4344).\r
15         function lastNoneSpaceChild( block )\r
16         {\r
17                 var lastIndex = block.children.length,\r
18                         last = block.children[ lastIndex - 1 ];\r
19                 while (  last && last.type == CKEDITOR.NODE_TEXT && !CKEDITOR.tools.trim( last.value ) )\r
20                         last = block.children[ --lastIndex ];\r
21                 return last;\r
22         }\r
23 \r
24         function trimFillers( block, fromSource )\r
25         {\r
26                 // If the current node is a block, and if we're converting from source or\r
27                 // we're not in IE then search for and remove any tailing BR node.\r
28                 //\r
29                 // Also, any   at the end of blocks are fillers, remove them as well.\r
30                 // (#2886)\r
31                 var children = block.children, lastChild = lastNoneSpaceChild( block );\r
32                 if ( lastChild )\r
33                 {\r
34                         if ( ( fromSource || !CKEDITOR.env.ie ) && lastChild.type == CKEDITOR.NODE_ELEMENT && lastChild.name == 'br' )\r
35                                 children.pop();\r
36                         if ( lastChild.type == CKEDITOR.NODE_TEXT && tailNbspRegex.test( lastChild.value ) )\r
37                                 children.pop();\r
38                 }\r
39         }\r
40 \r
41         function blockNeedsExtension( block, fromSource, extendEmptyBlock )\r
42         {\r
43                 if( !fromSource && ( !extendEmptyBlock ||\r
44                         typeof extendEmptyBlock == 'function' && ( extendEmptyBlock( block ) === false ) ) )\r
45                         return false;\r
46 \r
47         // 1. For IE version >=8,  empty blocks are displayed correctly themself in wysiwiyg;\r
48         // 2. For the rest, at least table cell and list item need no filler space.\r
49         // (#6248)\r
50         if ( fromSource && CKEDITOR.env.ie &&\r
51                 ( document.documentMode > 7\r
52                 || block.name in CKEDITOR.dtd.tr\r
53                 || block.name in CKEDITOR.dtd.$listItem ) )\r
54             return false;\r
55 \r
56                 var lastChild = lastNoneSpaceChild( block );\r
57 \r
58                 return !lastChild || lastChild &&\r
59                                 ( lastChild.type == CKEDITOR.NODE_ELEMENT && lastChild.name == 'br'\r
60                                 // Some of the controls in form needs extension too,\r
61                                 // to move cursor at the end of the form. (#4791)\r
62                                 || block.name == 'form' && lastChild.name == 'input' );\r
63         }\r
64 \r
65         function getBlockExtension( isOutput, emptyBlockFiller )\r
66         {\r
67                 return function( node )\r
68                 {\r
69                         trimFillers( node, !isOutput );\r
70 \r
71                         if ( blockNeedsExtension( node, !isOutput, emptyBlockFiller ) )\r
72                         {\r
73                                 if ( isOutput || CKEDITOR.env.ie )\r
74                                         node.add( new CKEDITOR.htmlParser.text( '\xa0' ) );\r
75                                 else\r
76                                         node.add( new CKEDITOR.htmlParser.element( 'br', {} ) );\r
77                         }\r
78                 };\r
79         }\r
80 \r
81         var dtd = CKEDITOR.dtd;\r
82 \r
83         // Define orders of table elements.\r
84         var tableOrder = [ 'caption', 'colgroup', 'col', 'thead', 'tfoot', 'tbody' ];\r
85 \r
86         // Find out the list of block-like tags that can contain <br>.\r
87         var blockLikeTags = CKEDITOR.tools.extend( {}, dtd.$block, dtd.$listItem, dtd.$tableContent );\r
88         for ( var i in blockLikeTags )\r
89         {\r
90                 if ( ! ( 'br' in dtd[i] ) )\r
91                         delete blockLikeTags[i];\r
92         }\r
93         // We just avoid filler in <pre> right now.\r
94         // TODO: Support filler for <pre>, line break is also occupy line height.\r
95         delete blockLikeTags.pre;\r
96         var defaultDataFilterRules =\r
97         {\r
98                 elements : {},\r
99                 attributeNames :\r
100                 [\r
101                         // Event attributes (onXYZ) must not be directly set. They can become\r
102                         // active in the editing area (IE|WebKit).\r
103                         [ ( /^on/ ), 'data-cke-pa-on' ]\r
104                 ]\r
105         };\r
106 \r
107         var defaultDataBlockFilterRules = { elements : {} };\r
108 \r
109         for ( i in blockLikeTags )\r
110                 defaultDataBlockFilterRules.elements[ i ] = getBlockExtension();\r
111 \r
112         var defaultHtmlFilterRules =\r
113                 {\r
114                         elementNames :\r
115                         [\r
116                                 // Remove the "cke:" namespace prefix.\r
117                                 [ ( /^cke:/ ), '' ],\r
118 \r
119                                 // Ignore <?xml:namespace> tags.\r
120                                 [ ( /^\?xml:namespace$/ ), '' ]\r
121                         ],\r
122 \r
123                         attributeNames :\r
124                         [\r
125                                 // Attributes saved for changes and protected attributes.\r
126                                 [ ( /^data-cke-(saved|pa)-/ ), '' ],\r
127 \r
128                                 // All "data-cke-" attributes are to be ignored.\r
129                                 [ ( /^data-cke-.*/ ), '' ],\r
130 \r
131                                 [ 'hidefocus', '' ]\r
132                         ],\r
133 \r
134                         elements :\r
135                         {\r
136                                 $ : function( element )\r
137                                 {\r
138                                         var attribs = element.attributes;\r
139 \r
140                                         if ( attribs )\r
141                                         {\r
142                                                 // Elements marked as temporary are to be ignored.\r
143                                                 if ( attribs[ 'data-cke-temp' ] )\r
144                                                         return false;\r
145 \r
146                                                 // Remove duplicated attributes - #3789.\r
147                                                 var attributeNames = [ 'name', 'href', 'src' ],\r
148                                                         savedAttributeName;\r
149                                                 for ( var i = 0 ; i < attributeNames.length ; i++ )\r
150                                                 {\r
151                                                         savedAttributeName = 'data-cke-saved-' + attributeNames[ i ];\r
152                                                         savedAttributeName in attribs && ( delete attribs[ attributeNames[ i ] ] );\r
153                                                 }\r
154                                         }\r
155 \r
156                                         return element;\r
157                                 },\r
158 \r
159                                 // The contents of table should be in correct order (#4809).\r
160                                 table : function( element )\r
161                                 {\r
162                                         var children = element.children;\r
163                                         children.sort( function ( node1, node2 )\r
164                                                                    {\r
165                                                                            return node1.type == CKEDITOR.NODE_ELEMENT && node2.type == node1.type ?\r
166                                                                                         CKEDITOR.tools.indexOf( tableOrder, node1.name )  > CKEDITOR.tools.indexOf( tableOrder, node2.name ) ? 1 : -1 : 0;\r
167                                                                    } );\r
168                                 },\r
169 \r
170                                 embed : function( element )\r
171                                 {\r
172                                         var parent = element.parent;\r
173 \r
174                                         // If the <embed> is child of a <object>, copy the width\r
175                                         // and height attributes from it.\r
176                                         if ( parent && parent.name == 'object' )\r
177                                         {\r
178                                                 var parentWidth = parent.attributes.width,\r
179                                                         parentHeight = parent.attributes.height;\r
180                                                 parentWidth && ( element.attributes.width = parentWidth );\r
181                                                 parentHeight && ( element.attributes.height = parentHeight );\r
182                                         }\r
183                                 },\r
184                                 // Restore param elements into self-closing.\r
185                                 param : function( param )\r
186                                 {\r
187                                         param.children = [];\r
188                                         param.isEmpty = true;\r
189                                         return param;\r
190                                 },\r
191 \r
192                                 // Remove empty link but not empty anchor.(#3829)\r
193                                 a : function( element )\r
194                                 {\r
195                                         if ( !( element.children.length ||\r
196                                                         element.attributes.name ||\r
197                                                         element.attributes[ 'data-cke-saved-name' ] ) )\r
198                                         {\r
199                                                 return false;\r
200                                         }\r
201                                 },\r
202 \r
203                                 // Remove dummy span in webkit.\r
204                                 span: function( element )\r
205                                 {\r
206                                         if ( element.attributes[ 'class' ] == 'Apple-style-span' )\r
207                                                 delete element.name;\r
208                                 },\r
209 \r
210                                 // Empty <pre> in IE is reported with filler node (&nbsp;).\r
211                                 pre : function( element ) { CKEDITOR.env.ie && trimFillers( element ); },\r
212 \r
213                                 html : function( element )\r
214                                 {\r
215                                         delete element.attributes.contenteditable;\r
216                                         delete element.attributes[ 'class' ];\r
217                                 },\r
218 \r
219                                 body : function( element )\r
220                                 {\r
221                                         delete element.attributes.spellcheck;\r
222                                         delete element.attributes.contenteditable;\r
223                                 },\r
224 \r
225                                 style : function( element )\r
226                                 {\r
227                                         var child = element.children[ 0 ];\r
228                                         child && child.value && ( child.value = CKEDITOR.tools.trim( child.value ));\r
229 \r
230                                         if ( !element.attributes.type )\r
231                                                 element.attributes.type = 'text/css';\r
232                                 },\r
233 \r
234                                 title : function( element )\r
235                                 {\r
236                                         var titleText = element.children[ 0 ];\r
237                                         titleText && ( titleText.value = element.attributes[ 'data-cke-title' ] || '' );\r
238                                 }\r
239                         },\r
240 \r
241                         attributes :\r
242                         {\r
243                                 'class' : function( value, element )\r
244                                 {\r
245                                         // Remove all class names starting with "cke_".\r
246                                         return CKEDITOR.tools.ltrim( value.replace( /(?:^|\s+)cke_[^\s]*/g, '' ) ) || false;\r
247                                 }\r
248                         }\r
249                 };\r
250 \r
251         if ( CKEDITOR.env.ie )\r
252         {\r
253                 // IE outputs style attribute in capital letters. We should convert\r
254                 // them back to lower case, while not hurting the values (#5930)\r
255                 defaultHtmlFilterRules.attributes.style = function( value, element )\r
256                 {\r
257                         return value.replace( /(^|;)([^\:]+)/g, function( match )\r
258                                 {\r
259                                         return match.toLowerCase();\r
260                                 });\r
261                 };\r
262         }\r
263 \r
264         function protectReadOnly( element )\r
265         {\r
266                 var attrs = element.attributes;\r
267 \r
268                 // We should flag that the element was locked by our code so\r
269                 // it'll be editable by the editor functions (#6046).\r
270                 if ( attrs.contenteditable != "false" )\r
271                         attrs[ 'data-cke-editable' ] = attrs.contenteditable ? 'true' : 1;\r
272 \r
273                 attrs.contenteditable = "false";\r
274         }\r
275         function unprotectReadyOnly( element )\r
276         {\r
277                 var attrs = element.attributes;\r
278                 switch( attrs[ 'data-cke-editable' ] )\r
279                 {\r
280                         case 'true':    attrs.contenteditable = 'true'; break;\r
281                         case '1':               delete attrs.contenteditable;   break;\r
282                 }\r
283         }\r
284         // Disable form elements editing mode provided by some browers. (#5746)\r
285         for ( i in { input : 1, textarea : 1 } )\r
286         {\r
287                 defaultDataFilterRules.elements[ i ] = protectReadOnly;\r
288                 defaultHtmlFilterRules.elements[ i ] = unprotectReadyOnly;\r
289         }\r
290 \r
291         var protectElementRegex = /<(a|area|img|input)\b([^>]*)>/gi,\r
292                 protectAttributeRegex = /\b(href|src|name)\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|(?:[^ "'>]+))/gi;\r
293 \r
294         var protectElementsRegex = /(?:<style(?=[ >])[^>]*>[\s\S]*<\/style>)|(?:<(:?link|meta|base)[^>]*>)/gi,\r
295                 encodedElementsRegex = /<cke:encoded>([^<]*)<\/cke:encoded>/gi;\r
296 \r
297         var protectElementNamesRegex = /(<\/?)((?:object|embed|param|html|body|head|title)[^>]*>)/gi,\r
298                 unprotectElementNamesRegex = /(<\/?)cke:((?:html|body|head|title)[^>]*>)/gi;\r
299 \r
300         var protectSelfClosingRegex = /<cke:(param|embed)([^>]*?)\/?>(?!\s*<\/cke:\1)/gi;\r
301 \r
302         function protectAttributes( html )\r
303         {\r
304                 return html.replace( protectElementRegex, function( element, tag, attributes )\r
305                 {\r
306                         return '<' +  tag + attributes.replace( protectAttributeRegex, function( fullAttr, attrName )\r
307                         {\r
308                                 // We should not rewrite the existed protected attributes, e.g. clipboard content from editor. (#5218)\r
309                                 if ( attributes.indexOf( 'data-cke-saved-' + attrName ) == -1 )\r
310                                         return ' data-cke-saved-' + fullAttr + ' ' + fullAttr;\r
311 \r
312                                 return fullAttr;\r
313                         }) + '>';\r
314                 });\r
315         }\r
316 \r
317         function protectElements( html )\r
318         {\r
319                 return html.replace( protectElementsRegex, function( match )\r
320                         {\r
321                                 return '<cke:encoded>' + encodeURIComponent( match ) + '</cke:encoded>';\r
322                         });\r
323         }\r
324 \r
325         function unprotectElements( html )\r
326         {\r
327                 return html.replace( encodedElementsRegex, function( match, encoded )\r
328                         {\r
329                                 return decodeURIComponent( encoded );\r
330                         });\r
331         }\r
332 \r
333         function protectElementsNames( html )\r
334         {\r
335                 return html.replace( protectElementNamesRegex, '$1cke:$2');\r
336         }\r
337 \r
338         function unprotectElementNames( html )\r
339         {\r
340                 return html.replace( unprotectElementNamesRegex, '$1$2' );\r
341         }\r
342 \r
343         function protectSelfClosingElements( html )\r
344         {\r
345                 return html.replace( protectSelfClosingRegex, '<cke:$1$2></cke:$1>' );\r
346         }\r
347 \r
348         function protectPreFormatted( html )\r
349         {\r
350                 return html.replace( /(<pre\b[^>]*>)(\r\n|\n)/g, '$1$2$2' );\r
351         }\r
352 \r
353         function protectRealComments( html )\r
354         {\r
355                 return html.replace( /<!--(?!{cke_protected})[\s\S]+?-->/g, function( match )\r
356                         {\r
357                                 return '<!--' + protectedSourceMarker +\r
358                                                 '{C}' +\r
359                                                 encodeURIComponent( match ).replace( /--/g, '%2D%2D' ) +\r
360                                                 '-->';\r
361                         });\r
362         }\r
363 \r
364         function unprotectRealComments( html )\r
365         {\r
366                 return html.replace( /<!--\{cke_protected\}\{C\}([\s\S]+?)-->/g, function( match, data )\r
367                         {\r
368                                 return decodeURIComponent( data );\r
369                         });\r
370         }\r
371 \r
372         function unprotectSource( html, editor )\r
373         {\r
374                 var store = editor._.dataStore;\r
375 \r
376                 return html.replace( /<!--\{cke_protected\}([\s\S]+?)-->/g, function( match, data )\r
377                         {\r
378                                 return decodeURIComponent( data );\r
379                         }).replace( /\{cke_protected_(\d+)\}/g, function( match, id )\r
380                         {\r
381                                 return store && store[ id ] || '';\r
382                         });\r
383         }\r
384 \r
385         function protectSource( data, editor )\r
386         {\r
387                 var protectedHtml = [],\r
388                         protectRegexes = editor.config.protectedSource,\r
389                         store = editor._.dataStore || ( editor._.dataStore = { id : 1 } ),\r
390                         tempRegex = /<\!--\{cke_temp(comment)?\}(\d*?)-->/g;\r
391 \r
392                 var regexes =\r
393                         [\r
394                                 // Script tags will also be forced to be protected, otherwise\r
395                                 // IE will execute them.\r
396                                 ( /<script[\s\S]*?<\/script>/gi ),\r
397 \r
398                                 // <noscript> tags (get lost in IE and messed up in FF).\r
399                                 /<noscript[\s\S]*?<\/noscript>/gi\r
400                         ]\r
401                         .concat( protectRegexes );\r
402 \r
403                 // First of any other protection, we must protect all comments\r
404                 // to avoid loosing them (of course, IE related).\r
405                 // Note that we use a different tag for comments, as we need to\r
406                 // transform them when applying filters.\r
407                 data = data.replace( (/<!--[\s\S]*?-->/g), function( match )\r
408                         {\r
409                                 return  '<!--{cke_tempcomment}' + ( protectedHtml.push( match ) - 1 ) + '-->';\r
410                         });\r
411 \r
412                 for ( var i = 0 ; i < regexes.length ; i++ )\r
413                 {\r
414                         data = data.replace( regexes[i], function( match )\r
415                                 {\r
416                                         match = match.replace( tempRegex,               // There could be protected source inside another one. (#3869).\r
417                                                 function( $, isComment, id )\r
418                                                 {\r
419                                                         return protectedHtml[ id ];\r
420                                                 }\r
421                                         );\r
422 \r
423                                         // Avoid protecting over protected, e.g. /\{.*?\}/\r
424                                         return ( /cke_temp(comment)?/ ).test( match ) ? match\r
425                                                 : '<!--{cke_temp}' + ( protectedHtml.push( match ) - 1 ) + '-->';\r
426                                 });\r
427                 }\r
428                 data = data.replace( tempRegex, function( $, isComment, id )\r
429                         {\r
430                                 return '<!--' + protectedSourceMarker +\r
431                                                 ( isComment ? '{C}' : '' ) +\r
432                                                 encodeURIComponent( protectedHtml[ id ] ).replace( /--/g, '%2D%2D' ) +\r
433                                                 '-->';\r
434                         }\r
435                 );\r
436 \r
437                 // Different protection pattern is used for those that\r
438                 // live in attributes to avoid from being HTML encoded.\r
439                 return data.replace( /(['"]).*?\1/g, function ( match )\r
440                 {\r
441                         return match.replace( /<!--\{cke_protected\}([\s\S]+?)-->/g, function( match, data )\r
442                         {\r
443                                 store[ store.id ] = decodeURIComponent( data );\r
444                                 return '{cke_protected_'+ ( store.id++ )  + '}';\r
445                         });\r
446                 });\r
447         }\r
448 \r
449         CKEDITOR.plugins.add( 'htmldataprocessor',\r
450         {\r
451                 requires : [ 'htmlwriter' ],\r
452 \r
453                 init : function( editor )\r
454                 {\r
455                         var dataProcessor = editor.dataProcessor = new CKEDITOR.htmlDataProcessor( editor );\r
456 \r
457                         dataProcessor.writer.forceSimpleAmpersand = editor.config.forceSimpleAmpersand;\r
458 \r
459                         dataProcessor.dataFilter.addRules( defaultDataFilterRules );\r
460                         dataProcessor.dataFilter.addRules( defaultDataBlockFilterRules );\r
461                         dataProcessor.htmlFilter.addRules( defaultHtmlFilterRules );\r
462 \r
463                         var defaultHtmlBlockFilterRules = { elements : {} };\r
464                         for ( i in blockLikeTags )\r
465                                 defaultHtmlBlockFilterRules.elements[ i ] = getBlockExtension( true, editor.config.fillEmptyBlocks );\r
466 \r
467                         dataProcessor.htmlFilter.addRules( defaultHtmlBlockFilterRules );\r
468                 },\r
469 \r
470                 onLoad : function()\r
471                 {\r
472                         ! ( 'fillEmptyBlocks' in CKEDITOR.config ) && ( CKEDITOR.config.fillEmptyBlocks = 1 );\r
473                 }\r
474         });\r
475 \r
476         CKEDITOR.htmlDataProcessor = function( editor )\r
477         {\r
478                 this.editor = editor;\r
479 \r
480                 this.writer = new CKEDITOR.htmlWriter();\r
481                 this.dataFilter = new CKEDITOR.htmlParser.filter();\r
482                 this.htmlFilter = new CKEDITOR.htmlParser.filter();\r
483         };\r
484 \r
485         CKEDITOR.htmlDataProcessor.prototype =\r
486         {\r
487                 toHtml : function( data, fixForBody )\r
488                 {\r
489                         // The source data is already HTML, but we need to clean\r
490                         // it up and apply the filter.\r
491 \r
492                         data = protectSource( data, this.editor );\r
493 \r
494                         // Before anything, we must protect the URL attributes as the\r
495                         // browser may changing them when setting the innerHTML later in\r
496                         // the code.\r
497                         data = protectAttributes( data );\r
498 \r
499                         // Protect elements than can't be set inside a DIV. E.g. IE removes\r
500                         // style tags from innerHTML. (#3710)\r
501                         data = protectElements( data );\r
502 \r
503                         // Certain elements has problem to go through DOM operation, protect\r
504                         // them by prefixing 'cke' namespace. (#3591)\r
505                         data = protectElementsNames( data );\r
506 \r
507                         // All none-IE browsers ignore self-closed custom elements,\r
508                         // protecting them into open-close. (#3591)\r
509                         data = protectSelfClosingElements( data );\r
510 \r
511                         // Compensate one leading line break after <pre> open as browsers\r
512                         // eat it up. (#5789)\r
513                         data = protectPreFormatted( data );\r
514 \r
515                         // Call the browser to help us fixing a possibly invalid HTML\r
516                         // structure.\r
517                         var div = new CKEDITOR.dom.element( 'div' );\r
518                         // Add fake character to workaround IE comments bug. (#3801)\r
519                         div.setHtml( 'a' + data );\r
520                         data = div.getHtml().substr( 1 );\r
521 \r
522                         // Unprotect "some" of the protected elements at this point.\r
523                         data = unprotectElementNames( data );\r
524 \r
525                         data = unprotectElements( data );\r
526 \r
527                         // Restore the comments that have been protected, in this way they\r
528                         // can be properly filtered.\r
529                         data = unprotectRealComments( data );\r
530 \r
531                         // Now use our parser to make further fixes to the structure, as\r
532                         // well as apply the filter.\r
533                         var fragment = CKEDITOR.htmlParser.fragment.fromHtml( data, fixForBody ),\r
534                                 writer = new CKEDITOR.htmlParser.basicWriter();\r
535 \r
536                         fragment.writeHtml( writer, this.dataFilter );\r
537                         data = writer.getHtml( true );\r
538 \r
539                         // Protect the real comments again.\r
540                         data = protectRealComments( data );\r
541 \r
542                         return data;\r
543                 },\r
544 \r
545                 toDataFormat : function( html, fixForBody )\r
546                 {\r
547                         var writer = this.writer,\r
548                                 fragment = CKEDITOR.htmlParser.fragment.fromHtml( html, fixForBody );\r
549 \r
550                         writer.reset();\r
551 \r
552                         fragment.writeHtml( writer, this.htmlFilter );\r
553 \r
554                         var data = writer.getHtml( true );\r
555 \r
556                         // Restore those non-HTML protected source. (#4475,#4880)\r
557                         data = unprotectRealComments( data );\r
558                         data = unprotectSource( data, this.editor );\r
559 \r
560                         return data;\r
561                 }\r
562         };\r
563 })();\r
564 \r
565 /**\r
566  * Whether to force using "&" instead of "&amp;amp;" in elements attributes\r
567  * values, it's not recommended to change this setting for compliance with the\r
568  * W3C XHTML 1.0 standards (<a href="http://www.w3.org/TR/xhtml1/#C_12">C.12, XHTML 1.0</a>).\r
569  * @name CKEDITOR.config.forceSimpleAmpersand\r
570  * @name CKEDITOR.config.forceSimpleAmpersand\r
571  * @type Boolean\r
572  * @default false\r
573  * @example\r
574  * config.forceSimpleAmpersand = false;\r
575  */\r
576 \r
577 /**\r
578  * Whether a filler text (non-breaking space entity - &nbsp;) will be inserted into empty block elements in HTML output,\r
579  * this is used to render block elements properly with line-height; When a function is instead specified,\r
580  * it'll be passed a {@link CKEDITOR.htmlParser.element} to decide whether adding the filler text\r
581  * by expecting a boolean return value.\r
582  * @name CKEDITOR.config.fillEmptyBlocks\r
583  * @since 3.5\r
584  * @type Boolean\r
585  * @default true\r
586  * @example\r
587  * config.fillEmptyBlocks = false;      // Prevent filler nodes in all empty blocks.\r
588  *\r
589  * // Prevent filler node only in float cleaners.\r
590  * config.fillEmptyBlocks = function( element )\r
591  * {\r
592  *      if ( element.attributes[ 'class' ].indexOf ( 'clear-both' ) != -1 )\r
593  *              return false;\r
594  * }\r
595  */\r