code: function(content, pos, isBackward) {
  			var result = '';
  			var len = content.length;
  			var offset = pos;
  			var stopChars = '{}/\\<>\n\r';
  			var bracePos = -1, ch;
  			
  			// search left until we find rule edge
  			while (offset >= 0) {
  				ch = content.charAt(offset);
  				if (ch == '{') {
  					bracePos = offset;
  					break;
  				}
  				else if (ch == '}' && !isBackward) {
  					offset++;
  					break;
  				}
  				
  				offset--;
  			}
  			
  			// search right for full rule set
  			while (offset < len) {
  				ch = content.charAt(offset);
  				if (ch == '{') {
  					bracePos = offset;
  				} else if (ch == '}') {
  					if (bracePos != -1)
  						result = content.substring(bracePos, offset + 1);
  					break;
  				}
  				
  				offset++;
  			}
  			
  			if (result) {
  				// find CSS selector
  				offset = bracePos - 1;
  				var selector = '';
  				while (offset >= 0) {
  					ch = content.charAt(offset);
  					if (stopChars.indexOf(ch) != -1) break;
  					offset--;
  				}
  				
  				// also trim whitespace
  				selector = content.substring(offset + 1, bracePos).replace(/^[\s\n\r]+/m, '');
  				return require('range').create(bracePos - selector.length, result.length + selector.length);
  			}
  			
  			return null;
  		}
docs: Extracts single CSS selector definition from source code
  @param {String} content CSS source code
  @param {Number} pos Character position where to start source code extraction
  @returns {Range}