/// <summary>
/// Translates the value of a constant returned by <see cref="ISymUnmanagedConstant.GetValue(out object)"/> to a <see cref="ConstantValue"/>.
/// </summary>
public static ConstantValue GetSymConstantValue(ITypeSymbolInternal type, object symValue)
{
if (type.TypeKind == TypeKind.Enum)
{
type = ((INamedTypeSymbolInternal)type).EnumUnderlyingType;
}
return((type.SpecialType, symValue) switch
{
(SpecialType.System_Boolean, short shortVal) => ConstantValue.Create(shortVal != 0),
(SpecialType.System_Byte, short shortVal)when unchecked ((byte)shortVal) == shortVal
=> ConstantValue.Create((byte)shortVal),
(SpecialType.System_SByte, short shortVal)
when unchecked ((sbyte)shortVal) == shortVal
=> ConstantValue.Create((sbyte)shortVal),
(SpecialType.System_Int16, short shortVal) => ConstantValue.Create(shortVal),
(SpecialType.System_Char, ushort ushortVal)
=> ConstantValue.Create((char)ushortVal),
(SpecialType.System_UInt16, ushort ushortVal) => ConstantValue.Create(ushortVal),
(SpecialType.System_Int32, int intVal) => ConstantValue.Create(intVal),
(SpecialType.System_UInt32, uint uintVal) => ConstantValue.Create(uintVal),
(SpecialType.System_Int64, long longVal) => ConstantValue.Create(longVal),
(SpecialType.System_UInt64, ulong ulongVal) => ConstantValue.Create(ulongVal),
(SpecialType.System_Single, float floatVal) => ConstantValue.Create(floatVal),
(SpecialType.System_Double, double doubleVal) => ConstantValue.Create(doubleVal),
(SpecialType.System_String, 0) => ConstantValue.Null,
(SpecialType.System_String, null) => ConstantValue.Create(string.Empty),
(SpecialType.System_String, string str) => ConstantValue.Create(str),
(SpecialType.System_Object, 0) => ConstantValue.Null,
(SpecialType.System_Decimal, decimal decimalValue)
=> ConstantValue.Create(decimalValue),
(SpecialType.System_DateTime, double doubleVal)
=> ConstantValue.Create(DateTimeUtilities.ToDateTime(doubleVal)),
(SpecialType.None, 0)when type.IsReferenceType => ConstantValue.Null,
_ => ConstantValue.Bad,
});
internal static ConstantValue ReinterpretConstantValue(ConstantValue raw, SpecialType specialType)
{
return(specialType == SpecialType.System_DateTime
? ConstantValue.Create(DateTimeUtilities.ToDateTime((double)raw.Value))
: raw);
}
/// <summary>
/// Translates the value of a constant returned by <see cref="ISymUnmanagedConstant.GetValue(out object)"/> to a <see cref="ConstantValue"/>.
/// </summary>
public static ConstantValue GetSymConstantValue(ITypeSymbol type, object symValue)
{
if (type.TypeKind == TypeKind.Enum)
{
type = ((INamedTypeSymbol)type).EnumUnderlyingType;
}
short shortValue;
switch (type.SpecialType)
{
case SpecialType.System_Boolean:
if (!(symValue is short))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((short)symValue != 0));
case SpecialType.System_Byte:
if (!(symValue is short))
{
return(ConstantValue.Bad);
}
shortValue = (short)symValue;
if (unchecked ((byte)shortValue) != shortValue)
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((byte)shortValue));
case SpecialType.System_SByte:
if (!(symValue is short))
{
return(ConstantValue.Bad);
}
shortValue = (short)symValue;
if (unchecked ((sbyte)shortValue) != shortValue)
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((sbyte)shortValue));
case SpecialType.System_Int16:
if (!(symValue is short))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((short)symValue));
case SpecialType.System_Char:
if (!(symValue is ushort))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((char)(ushort)symValue));
case SpecialType.System_UInt16:
if (!(symValue is ushort))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((ushort)symValue));
case SpecialType.System_Int32:
if (!(symValue is int))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((int)symValue));
case SpecialType.System_UInt32:
if (!(symValue is uint))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((uint)symValue));
case SpecialType.System_Int64:
if (!(symValue is long))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((long)symValue));
case SpecialType.System_UInt64:
if (!(symValue is ulong))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((ulong)symValue));
case SpecialType.System_Single:
if (!(symValue is float))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((float)symValue));
case SpecialType.System_Double:
if (!(symValue is double))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((double)symValue));
case SpecialType.System_String:
if (symValue is int && (int)symValue == 0)
{
return(ConstantValue.Null);
}
if (symValue == null)
{
return(ConstantValue.Create(string.Empty));
}
var str = symValue as string;
if (str == null)
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create(str));
case SpecialType.System_Object:
if (symValue is int && (int)symValue == 0)
{
return(ConstantValue.Null);
}
return(ConstantValue.Bad);
case SpecialType.System_Decimal:
if (!(symValue is decimal))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create((decimal)symValue));
case SpecialType.System_DateTime:
if (!(symValue is double))
{
return(ConstantValue.Bad);
}
return(ConstantValue.Create(DateTimeUtilities.ToDateTime((double)symValue)));
case SpecialType.None:
if (type.IsReferenceType)
{
if (symValue is int && (int)symValue == 0)
{
return(ConstantValue.Null);
}
return(ConstantValue.Bad);
}
return(ConstantValue.Bad);
default:
return(ConstantValue.Bad);
}
}
