docs: function parseOperator( str , runtime ) {
  	var c , op , j ;
  
  	runtime.i ++ ;
  
  	for ( j = runtime.i ; j < runtime.iEndOfLine ; j ++ ) {
  		c = str.charCodeAt( j ) ;
  
  		if ( c === 0x29 ) {
  			// closing parenthesis
  			op = str.slice( runtime.i , j ).trim() ;
  			runtime.i = j + 1 ;
  			return op ;
  		}
  	}
  
  	throw new SyntaxError( "Unexpected end of line, expecting a closing parenthesis (" + common.parsers.locationStr( runtime ) + ")" ) ;
  }