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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if !SILVERLIGHT // ComObject
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace Microsoft.Scripting.ComInterop {
internal static class VarEnumSelector {
private static readonly Dictionary<VarEnum, Type> _ComToManagedPrimitiveTypes = CreateComToManagedPrimitiveTypes();
/// <summary>
/// Gets the managed type that an object needs to be coverted to in order for it to be able
/// to be represented as a Variant.
///
/// In general, there is a many-to-many mapping between Type and VarEnum. However, this method
/// returns a simple mapping that is needed for the current implementation. The reason for the
/// many-to-many relation is:
/// 1. Int32 maps to VT_I4 as well as VT_ERROR, and Decimal maps to VT_DECIMAL and VT_CY. However,
/// this changes if you throw the wrapper types into the mix.
/// 2. There is no Type to represent COM types. __ComObject is a private type, and Object is too
/// general.
/// </summary>
internal static Type GetManagedMarshalType(VarEnum varEnum) {
Debug.Assert((varEnum & VarEnum.VT_BYREF) == 0);
if (varEnum == VarEnum.VT_CY) {
return typeof(CurrencyWrapper);
}
if (IsPrimitiveType(varEnum)) {
return _ComToManagedPrimitiveTypes[varEnum];
}
switch (varEnum) {
case VarEnum.VT_EMPTY:
case VarEnum.VT_NULL:
case VarEnum.VT_UNKNOWN:
case VarEnum.VT_DISPATCH:
case VarEnum.VT_VARIANT:
return typeof(Object);
case VarEnum.VT_ERROR:
return typeof(ErrorWrapper);
default:
throw new InvalidOperationException(string.Format("Unexpected VarEnum {0}.", varEnum));
}
}
private static Dictionary<VarEnum, Type> CreateComToManagedPrimitiveTypes() {
Dictionary<VarEnum, Type> dict = new Dictionary<VarEnum, Type>();
#region Generated ComToManagedPrimitiveTypes
// *** BEGIN GENERATED CODE ***
// generated by function: gen_ComToManagedPrimitiveTypes from: generate_comdispatch.py
dict[VarEnum.VT_I1] = typeof(SByte);
dict[VarEnum.VT_I2] = typeof(Int16);
dict[VarEnum.VT_I4] = typeof(Int32);
dict[VarEnum.VT_I8] = typeof(Int64);
dict[VarEnum.VT_UI1] = typeof(Byte);
dict[VarEnum.VT_UI2] = typeof(UInt16);
dict[VarEnum.VT_UI4] = typeof(UInt32);
dict[VarEnum.VT_UI8] = typeof(UInt64);
dict[VarEnum.VT_INT] = typeof(IntPtr);
dict[VarEnum.VT_UINT] = typeof(UIntPtr);
dict[VarEnum.VT_BOOL] = typeof(Boolean);
dict[VarEnum.VT_R4] = typeof(Single);
dict[VarEnum.VT_R8] = typeof(Double);
dict[VarEnum.VT_DECIMAL] = typeof(Decimal);
dict[VarEnum.VT_DATE] = typeof(DateTime);
dict[VarEnum.VT_BSTR] = typeof(String);
// *** END GENERATED CODE ***
#endregion
dict[VarEnum.VT_CY] = typeof(CurrencyWrapper);
dict[VarEnum.VT_ERROR] = typeof(ErrorWrapper);
return dict;
}
/// <summary>
/// Primitive types are the basic COM types. It includes valuetypes like ints, but also reference tyeps
/// like BStrs. It does not include composite types like arrays and user-defined COM types (IUnknown/IDispatch).
/// </summary>
private static bool IsPrimitiveType(VarEnum varEnum) {
switch (varEnum) {
#region Generated Variant IsPrimitiveType
// *** BEGIN GENERATED CODE ***
// generated by function: gen_IsPrimitiveType from: generate_comdispatch.py
case VarEnum.VT_I1:
case VarEnum.VT_I2:
case VarEnum.VT_I4:
case VarEnum.VT_I8:
case VarEnum.VT_UI1:
case VarEnum.VT_UI2:
case VarEnum.VT_UI4:
case VarEnum.VT_UI8:
case VarEnum.VT_INT:
case VarEnum.VT_UINT:
case VarEnum.VT_BOOL:
case VarEnum.VT_ERROR:
case VarEnum.VT_R4:
case VarEnum.VT_R8:
case VarEnum.VT_DECIMAL:
case VarEnum.VT_CY:
case VarEnum.VT_DATE:
case VarEnum.VT_BSTR:
// *** END GENERATED CODE ***
#endregion
return true;
}
return false;
}
}
}
#endif
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