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takeshik/conv.cs

Created February 2, 2012 22:24
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Numeric Conversions
Raw
conv.cs
internal static Type ConvertNumericType(Type expressionType, Type expectedType)
{
var expectedType_ = Type.GetTypeCode(Nullable.GetUnderlyingType(expectedType) ?? expectedType);
switch (Type.GetTypeCode(Nullable.GetUnderlyingType(expressionType) ?? expressionType))
{
case TypeCode.Char:
switch (expectedType_)
{
case TypeCode.Char:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.SByte:
switch (expectedType_)
{
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.Byte:
switch (expectedType_)
{
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.Int16:
switch (expectedType_)
{
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.UInt16:
switch (expectedType_)
{
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.Int32:
switch (expectedType_)
{
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.UInt32:
switch (expectedType_)
{
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.Int64:
switch (expectedType_)
{
case TypeCode.Int64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.UInt64:
switch (expectedType_)
{
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
case TypeCode.Single:
switch (expectedType_)
{
case TypeCode.Single:
case TypeCode.Double:
return expectedType;
default:
return expectedType;
}
case TypeCode.Double:
switch (expectedType_)
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
case TypeCode.Single:
case TypeCode.Double:
case TypeCode.Decimal:
return expectedType;
default:
return expectedType;
}
default:
return null;
}
}
internal static Type ConvertNumericTypeForAlithmetics(Type type, Boolean needsSigned)
{
var isNullable = Nullable.GetUnderlyingType(type) != null;
switch (Type.GetTypeCode(isNullable ? Nullable.GetUnderlyingType(type) : type))
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
return isNullable
? typeof(Nullable<Int32>)
: typeof(Int32);
case TypeCode.UInt32:
return needsSigned
? isNullable
? typeof(Nullable<Int64>)
: typeof(Int64)
: isNullable
? typeof(Nullable<UInt32>)
: typeof(UInt32);
case TypeCode.Int64:
return isNullable
? typeof(Nullable<Int64>)
: typeof(Int64);
case TypeCode.UInt64:
return needsSigned
? null
: isNullable
? typeof(Nullable<UInt64>)
: typeof(UInt64);
default:
return null;
}
}
internal static Type ConvertNumericTypeForAlithmetics(Type leftType, Type rightType)
{
var isNullable = Nullable.GetUnderlyingType(leftType) != null || Nullable.GetUnderlyingType(rightType) != null;
var rightType_ = Type.GetTypeCode(Nullable.GetUnderlyingType(rightType) ?? rightType);
switch (Type.GetTypeCode(Nullable.GetUnderlyingType(leftType) ?? leftType))
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
switch (rightType_)
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
return isNullable
? typeof(Nullable<Int32>)
: typeof(Int32);
case TypeCode.UInt32:
case TypeCode.Int64:
return isNullable
? typeof(Nullable<Int64>)
: typeof(Int64);
default:
return null;
}
case TypeCode.UInt32:
switch (rightType_)
{
case TypeCode.Char:
case TypeCode.Byte:
case TypeCode.UInt16:
case TypeCode.UInt32:
return isNullable
? typeof(Nullable<UInt32>)
: typeof(UInt32);
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
return isNullable
? typeof(Nullable<Int64>)
: typeof(Int64);
case TypeCode.UInt64:
return isNullable
? typeof(Nullable<UInt64>)
: typeof(UInt64);
default:
return null;
}
case TypeCode.Int64:
switch (rightType_)
{
case TypeCode.Char:
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
return isNullable
? typeof(Nullable<Int64>)
: typeof(Int64);
default:
return null;
}
case TypeCode.UInt64:
switch (rightType_)
{
case TypeCode.Char:
case TypeCode.Byte:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
return isNullable
? typeof(Nullable<UInt64>)
: typeof(UInt64);
default:
return null;
}
default:
return null;
}
}
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