getContextualizedSelector.js

function getContextualizedSelector( element, selector ) {
		var escapedId = CKEDITOR.tools.escapeCss( element.$.id ),
			selectorParts = selector.split( /,\s*/ ),
			splitRegex = /([\.#\[\s\+>:]|[\^*]*=["']*|["']*[\]]$)/,
			notEscapeCharacters = [ '', ' ', '+', '>', '[', ']', '.', '#', '=', '"', "'", '^', '*', ':' ],
			currentPart,
			escapedPart,
			i,
			j;

		for ( i = 0; i < selectorParts.length; i++ ) {
			currentPart = CKEDITOR.tools.trim( selectorParts[ i ] ).split( splitRegex );
			escapedPart = '';

			for ( j = 0; j < currentPart.length; j++ ) {
				escapedPart += CKEDITOR.tools.indexOf( notEscapeCharacters, currentPart[ j ].charAt( 0 ) ) === -1 ?
					CKEDITOR.tools.escapeCss( currentPart[ j ] ) : currentPart[ j ];
			}

			selectorParts[ i ] = escapedPart;
		}

		return '#' + escapedId + ' ' + selectorParts.join( ', #' + escapedId + ' ' );
	}