private static Func <Closure, object> Unary(UnaryExpression unaryExpression,
ConstantExpression[] constantsExprs, ParameterExpression[] localsExprs)
{
var valueFn = Expression(unaryExpression.Operand, constantsExprs, localsExprs);
var opUnaryNegation = WrapUnaryOperation(unaryExpression.Method) ?? WrapUnaryOperation(unaryExpression.Operand.Type, "op_UnaryNegation");
var opUnaryPlus = WrapUnaryOperation(unaryExpression.Method) ?? WrapUnaryOperation(unaryExpression.Operand.Type, "op_UnaryPlus");
var opOnesComplement = WrapUnaryOperation(unaryExpression.Method) ?? WrapUnaryOperation(unaryExpression.Operand.Type, "op_OnesComplement");
var isNullable = IsNullable(unaryExpression.Operand);
return(closure =>
{
var operand = valueFn(closure);
if (isNullable && operand == null && unaryExpression.NodeType != ExpressionType.ArrayLength)
{
return null;
}
switch (unaryExpression.NodeType)
{
case ExpressionType.Negate:
case ExpressionType.NegateChecked:
return Intrinsics.UnaryOperation(closure, operand, unaryExpression.NodeType, opUnaryNegation);
case ExpressionType.UnaryPlus:
return Intrinsics.UnaryOperation(closure, operand, unaryExpression.NodeType, opUnaryPlus);
case ExpressionType.Not:
return Intrinsics.UnaryOperation(closure, operand, unaryExpression.NodeType, opOnesComplement);
case ExpressionType.ArrayLength:
return closure.Unbox <Array>(operand).Length;
}
throw new InvalidOperationException(string.Format(Properties.Resources.EXCEPTION_COMPIL_UNKNOWNUNARYEXPRTYPE, unaryExpression.Type));
});
}
