if (value instanceof CSSFunctionValue == false)
{
return value;
}
final CSSFunctionValue functionValue = (CSSFunctionValue) value;
final StyleValueFunction function =
FunctionFactory.getInstance().getStyleFunction
(functionValue.getFunctionName());
if (function == null)
{
throw new FunctionEvaluationException
("Unsupported Function: " + functionValue);
}