CKEditor plugin that uses https://github.com/wGEric/phpBB-BBCode-Javascript-Parser to process the data

plugin.js

(function() {
	var BBCodeWriter = function(editor) {
		this.editor = editor;

		this.writer = new CKEDITOR.htmlWriter();
		this.dataFilter = new CKEDITOR.htmlParser.filter();
		this.htmlFilter = new CKEDITOR.htmlParser.filter();
	}

	BBCodeWriter.prototype = {
		toHtml : function (data, fixForBody) {
			return bbcodeParser.bbcodeToHtml(data);
		},

		toDataFormat : function (html, fixForBody) {
			var writer = this.writer,
				fragment = CKEDITOR.htmlParser.fragment.fromHtml( html, fixForBody );

			writer.reset();

			fragment.writeHtml( writer, this.htmlFilter );
			var data = writer.getHtml( true );

			return bbcodeParser.htmlToBBCode(data);
		}
	}

		var defaultHtmlFilterRules = {
			elementNames :
			[
				// Remove the "cke:" namespace prefix.
				[ ( /^cke:/ ), '' ],

				// Ignore <?xml:namespace> tags.
				[ ( /^\?xml:namespace$/ ), '' ]
			],

			attributeNames :
			[
				// Attributes saved for changes and protected attributes.
				[ ( /^data-cke-(saved|pa)-/ ), '' ],

				// All "data-cke-" attributes are to be ignored.
				[ ( /^data-cke-.*/ ), '' ],

				[ 'hidefocus', '' ]
			],

			elements :
			{
				$ : function( element )
				{
					var attribs = element.attributes;

					if ( attribs )
					{
						// Elements marked as temporary are to be ignored.
						if ( attribs[ 'data-cke-temp' ] )
							return false;

						// Remove duplicated attributes - #3789.
						var attributeNames = [ 'name', 'href', 'src' ],
							savedAttributeName;
						for ( var i = 0 ; i < attributeNames.length ; i++ )
						{
							savedAttributeName = 'data-cke-saved-' + attributeNames[ i ];
							savedAttributeName in attribs && ( delete attribs[ attributeNames[ i ] ] );
						}
					}

					return element;
				},

				// Remove empty link but not empty anchor.(#3829)
				a : function( element )
				{
					if ( !( element.children.length ||
							element.attributes.name ||
							element.attributes[ 'data-cke-saved-name' ] ) )
					{
						return false;
					}
				},

				// Remove dummy span in webkit.
				span: function( element )
				{
					if ( element.attributes[ 'class' ] == 'Apple-style-span' )
						delete element.name;
				},

				// Empty <pre> in IE is reported with filler node (&nbsp;).
				pre : function( element ) { CKEDITOR.env.ie && trimFillers( element ); },
			},

			attributes :
			{
				'class' : function( value, element )
				{
					// Remove all class names starting with "cke_".
					return CKEDITOR.tools.ltrim( value.replace( /(?:^|\s+)cke_[^\s]*/g, '' ) ) || false;
				}
			}
		};

	CKEDITOR.on( 'dialogDefinition', function( ev )
	{
		var tab, name = ev.data.name,
			definition = ev.data.definition;

		if ( name == 'link' )
		{
			definition.removeContents( 'target' );
			definition.removeContents( 'upload' );
			definition.removeContents( 'advanced' );
			tab = definition.getContents( 'info' );
			tab.remove( 'emailSubject' );
			tab.remove( 'emailBody' );
		}
		else if ( name == 'image' )
		{
			definition.removeContents( 'advanced' );
			tab = definition.getContents( 'Link' );
			tab.remove( 'cmbTarget' );
			tab = definition.getContents( 'info' );
			tab.remove( 'txtAlt' );
			tab.remove( 'basic' );
		}
	});

	CKEDITOR.plugins.add( 'phpbb',
	  {
		  beforeInit : function( editor )
		  {
			  // Adapt some critical editor configuration for better support
			  // of BBCode environment.
			  var config = editor.config;
			  CKEDITOR.tools.extend( config,
			  {
				  enterMode : CKEDITOR.ENTER_BR,
				  basicEntities: false,
				  entities : false,
				  fillEmptyBlocks : false
			  }, true );
		  },
		  init : function( editor )
		  {
			  var dataProcessor = editor.dataProcessor = new BBCodeWriter(editor);

			  dataProcessor.htmlFilter.addRules( defaultHtmlFilterRules ); // removes anything added by use of ckeditor internally
		  },
	  } );
})();