public void NullableFieldConvertsToSwiftOptional(Type viewType)
{
var sty = SwiftType.Of(viewType) as CustomViewType;
Assert.NotNull(sty);
Assert.Equal(1, sty !.NativeFields.Count);
Assert.False(sty.NativeFields [0].Nullability.IsNullable);
Assert.True(sty.NativeFields [0].Nullability [0].IsNullable);
var gargs = sty.NativeFields [0].SwiftType.GenericArguments;
Assert.NotNull(gargs);
Assert.Equal(1, gargs !.Count);
unsafe {
Assert.Equal("Optional", gargs [0].Metadata->TypeDescriptor->Name);
}
}
/// <summary>
/// Returns a <see cref="SwiftHandle"/> bridging the given object to Swift.
/// </summary>
/// <remarks>
/// The returned <see cref="SwiftHandle"/> must be disposed when no longer needed.
/// </remarks>
/// <param name="obj">The managed object to bridge to Swift</param>
/// <param name="nullability">Determines whether to bridge the value to Swift
/// as an Optional value. If <typeparamref name="T"/> is identified as a known
/// nullable wrapper, such as <see cref="Nullable"/>, then the value is bridged
/// as an Optional regardless of the value of this parameter.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="obj"/> is
/// <c>null</c>, <typeparamref name="T"/> is not a known nullable wrapper type,
/// and <paramref name="nullability"/> returns <c>false</c> from <see cref="Nullability.IsNullable"/>.</exception>
/// <exception cref="ArgumentException">Thrown when the type <typeparamref name="T"/> cannot
/// be directly bridged to Swift</exception>
public static unsafe SwiftHandle GetSwiftHandle <T> (this T obj, Nullability nullability = default)
{
var type = typeof(T);
var swiftType = SwiftType.Of(type, nullability);
if (swiftType == null && obj != null)
{
type = obj.GetType();
swiftType = SwiftType.Of(type, nullability);
}
if (swiftType == null)
{
throw new ArgumentException($"Type '{type}' cannot be bridged to Swift");
}
// Nullable types are bridged to Swift optionals
if (nullability.IsNullable || Nullability.IsReifiedNullable(type))
{
if (Nullability.IsNull(obj))
{
var underlyingType = Nullability.GetUnderlyingType(type);
var underlyingSwiftType = SwiftType.Of(underlyingType, nullability.Strip()) !;
return(Optional.Wrap(null, swiftType, underlyingSwiftType));
}
else
{
var unwrapped = Nullability.Unwrap(obj);
using (var unwrappedHandle = unwrapped.GetSwiftHandle(nullability.Strip()))
return(Optional.Wrap(unwrappedHandle.Pointer, swiftType, unwrappedHandle.SwiftType));
}
}
else if (obj is null)
{
throw new ArgumentNullException(nameof(obj));
}
return(obj switch {
ISwiftValue swiftValue => swiftValue.GetSwiftHandle(),
string val => new SwiftHandle(new Swift.String(val), swiftType, destroyOnDispose: true),
_ when type.IsPrimitive => new SwiftHandle(obj, swiftType),
_ => throw new NotImplementedException(type.ToString())
});
protected virtual ProtocolWitnessTable *CreateViewConformance()
{
viewConformanceDesc = (ViewProtocolConformanceDescriptor *)Marshal.AllocHGlobal(sizeof(ViewProtocolConformanceDescriptor));
// zero everything first
*viewConformanceDesc = default;
viewConformanceDesc->Populate(Metadata->TypeDescriptor);
var bodySwiftType = SwiftType.Of(BodyProperty.PropertyType) !;
var bodyConformance = bodySwiftType.GetProtocolConformance(SwiftUILib.ViewProtocol);
var witnessTable = SwiftCoreLib.GetProtocolWitnessTable(&viewConformanceDesc->ConformanceDescriptor, Metadata, null);
viewConformanceDesc->FixupAndRegister(
witnessTable,
bodyConformance,
bodySwiftType.Metadata,
SwiftGlueLib.BodyProtocolWitness);
return(witnessTable);
}
internal CustomViewType(Type customViewType) : base(customViewType, MetadataKinds.Struct)
{
try {
BodyProperty =
customViewType.GetProperty("Body__", BindingFlags.NonPublic | BindingFlags.Instance) ??
customViewType.GetProperty("Body", BindingFlags.Public | BindingFlags.Instance);
if (BodyProperty is null || !BodyProperty.CanRead || BodyProperty.CanWrite || !BodyProperty.PropertyType.IsSubclassOf(typeof(View)))
{
throw new ArgumentException($"View implementations must either override ViewType, or declare a public, read-only `Body` property returning a concrete type of `{nameof (View)}`");
}
var thunkMetadata = (CustomViewMetadata *)fullMetadata;
thunkMetadata->ThunkViewU = Metadata;
thunkMetadata->ThunkViewT = SwiftType.Of(BodyProperty.PropertyType) !.Metadata;
// Currently unused, so don't force allocation if it's a custom view
//thunkMetadata->ThunkViewTViewConformance = swiftBodyType.ViewConformance;
thunkMetadata->ThunkViewTViewConformance = null;
} catch {
// Ensure we don't leak allocated unmanaged memory
Dispose(true);
throw;
}
}
public static ModifiedBackground <TView, TBackground> Background <TView, TBackground> (this TView view, TBackground background)
where TView : View
where TBackground : View
{
var opaqueBackgroundMetadata = SwiftType.Of(typeof(ModifiedBackground <TView, TBackground>)) !;
var result = TaggedPointer.AllocHGlobal(opaqueBackgroundMetadata.NativeDataSize);
try {
using (var viewHandle = view.GetSwiftHandle())
using (var backgroundHandle = background.GetSwiftHandle())
{
var viewType = viewHandle.SwiftType;
var backgroundType = backgroundHandle.SwiftType;
// Note : When passing 2 generic parameters (in this case TView and TBackground) the order is IMPORTANT. The order is Generic1Pointer, Generic2Pointer, Generic1Metadata, Generic2Metadata, Generic1Prototcol, Generic2Prototcol
ViewBackground(result.Pointer, viewHandle.Pointer, backgroundHandle.Pointer, viewType.Metadata, backgroundType.Metadata, viewType.GetProtocolConformance(SwiftUILib.ViewProtocol), backgroundType.GetProtocolConformance(SwiftUILib.ViewProtocol));
return(new ModifiedBackground <TView, TBackground> (result));
}
} catch {
result.Dispose();
throw;
}
}
public TLFieldOffset(string mangledName, SwiftName module, SwiftClassType classType, bool direct, SwiftName ident, SwiftType type, ulong offset)
: base(CoreCompoundType.FieldOffset, mangledName, module, classType, offset)
{
IsDirect = direct;
Identifier = ident;
FieldType = type;
}
static bool IsProperty(SwiftType signature, SwiftClassType cl)
{
return(signature is SwiftPropertyType);
}
public String Copy() => SwiftType.Of(typeof(string)) !.Transfer(in this, TransferFuncType.InitWithCopy);
public TLMetadataDescriptor(SwiftType ofType, bool isBuiltIn, string mangledName, SwiftName module, ulong offset)
: base(CoreCompoundType.MetadataDescriptor, mangledName, module, offset)
{
OfType = Ex.ThrowOnNull(ofType, nameof(ofType));
IsBuiltIn = isBuiltIn;
}
static bool IsStaticProperty(SwiftType signature, SwiftClassType classType)
{
SwiftPropertyType pt = signature as SwiftPropertyType;
return(pt != null && pt.IsStatic);
}
static bool IsStaticMethod(SwiftType signature, SwiftClassType cl)
{
return(signature is SwiftStaticFunctionType);
}
public TLUnsafeMutableAddressor(string mangledName, SwiftName module, SwiftClassType classType, SwiftName ident, SwiftType ofType, ulong offset)
: base(CoreCompoundType.UnsafeMutableAddressor, mangledName, module, classType, offset)
{
Name = Ex.ThrowOnNull(ident, nameof(ident));
OfType = Ex.ThrowOnNull(ofType, nameof(ofType));
}
static bool IsPrivateProperty(SwiftType signature, SwiftClassType cl)
{
SwiftPropertyType pt = signature as SwiftPropertyType;
return(pt != null && pt.IsPrivate);
}
public TLVariable(string mangledName, SwiftName module, SwiftClassType classType, SwiftName ident, SwiftType ofType,
bool isStatic, ulong offset, SwiftType extensionOn = null)
: this(CoreCompoundType.Variable, mangledName, module, classType, ident, ofType, isStatic, offset, extensionOn)
{
}
public static void StoreTag(this SwiftType wrappedType, void *ptr, Tag tag) => wrappedType.StoreEnumTagSinglePayload(ptr, (int)tag, EmptyCases);
protected override void InitNativeData(void *handle)
{
// Using TransferFuncType.InitWithTake here in case we leak.
using (var dataHandle = Data.GetSwiftHandle())
SwiftType.Transfer(handle, dataHandle.Pointer, TransferFuncType.InitWithTake);
}
static void AssertFieldType(string fieldName)
{
var fld = GetField(fieldName);
Assert.NotNull(SwiftType.Of(fld.FieldType, Nullability.Of(fld)));
}
protected TLVariable(CoreCompoundType type, string mangledName, SwiftName module, SwiftClassType classType, SwiftName ident, SwiftType ofType,
bool isStatic, ulong offset, SwiftType extensionOn)
: base(type, mangledName, module, classType, offset)
{
Name = Ex.ThrowOnNull(ident, nameof(ident));
OfType = Ex.ThrowOnNull(ofType, nameof(ofType));
IsStatic = isStatic;
ExtensionOn = extensionOn;
}
static bool IsSubscript(SwiftType signature, SwiftClassType cl)
{
SwiftPropertyType prop = signature as SwiftPropertyType;
return(prop != null && prop.IsSubscript);
}
public TLPropertyDescriptor(string mangledName, SwiftName module, SwiftClassType classType, SwiftName ident, SwiftType ofType,
bool isStatic, ulong offset, SwiftType extensionOn = null)
: base(CoreCompoundType.PropertyDescriptor, mangledName, module, classType, ident, ofType, isStatic, offset, extensionOn)
{
}