if (splitParameters.get(0).getType() != ASTCssNodeType.COLOR_EXPRESSION) {
UnknownFunction unknownFunction = new UnknownFunction();
return unknownFunction.evaluate(splitParameters, problemsHandler, call, evaluatedParameter);
}
HiddenTokenAwareTree token = call.getUnderlyingStructure();
ColorExpression color = (ColorExpression) splitParameters.get(0);
ColorExpression dark = (ColorExpression) (splitParameters.size() > 1 ? splitParameters.get(1) : new ColorExpression(token, 0, 0, 0));
ColorExpression light = (ColorExpression) (splitParameters.size() > 2 ? splitParameters.get(2) : new ColorExpression(token, 255, 255, 255));
NumberExpression threshold = (NumberExpression) (splitParameters.size() > 3 ? splitParameters.get(3) : new NumberExpression(token, 43.0, "%", null, Dimension.PERCENTAGE));