public bool Equals(JsDynamicObject other)
{
if (other is null)
{
return(false);
}
if (Handle.Type != other.Handle.Type)
{
return(false);
}
System.Diagnostics.Debug.Assert(Handle.Type == JsType.Object || Handle.Type == JsType.Function,
"Only objects are supported by JsDynamicObject atm.");
CheckDisposed();
// TODO: Do this using a native method, which would be more efficient.
var gObj = _host.GetMember(JsValue.Global, "Object");
try
{
var result = _host.InvokeByName("is",
gObj,
2,
new DotNetValue[]
{
DotNetValue.FromJsValue(Handle),
DotNetValue.FromJsValue(other.Handle)
});
return(result.TryGetObject(_host, typeof(bool), out object resultObj) && (bool)resultObj);
}
finally
{
_host.Release(gObj);
}
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
CheckDisposed();
_host.SetMember(Handle, binder.Name, DotNetValue.FromObject(value, _host));
return(true);
}
public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
{
if (indexes.Length != 1)
{
throw new InvalidOperationException("We only support single parameter indexer");
}
CheckDisposed();
var index = indexes[0];
if (index == null)
{
throw new ArgumentNullException(nameof(index));
}
if (index is string stringIndex)
{
_host.SetMember(Handle, stringIndex, DotNetValue.FromObject(value, _host));
return(true);
}
/*if (index is int intIndex)
* {
* var jsHandle = _host.SetMemberByIndex(Handle, intIndex);
* return true;
* }*/
return(base.TrySetIndex(binder, indexes, value));
}
public dynamic CreateNewInstance(params object[] arguments)
{
var result = _host.CreateObject(Handle, arguments.Select(a => DotNetValue.FromObject(a, _host)).ToArray());
if (!result.TryGetObject(_host, typeof(object), out object newInstance))
{
throw new InvalidOperationException("Could not create new instance");
}
return(newInstance);
}
public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
{
CheckDisposed();
var resultHandle = _host.Invoke(Handle,
Handle,
args.Length,
args.Select(a => DotNetValue.FromObject(a, _host)).ToArray());
resultHandle.TryGetObject(_host, binder.ReturnType, out result);
return(true);
}
private static DotNetValue DynamicInvoke(Delegate @delegate, IHostInProcess host, JsValue[] argv)
{
var requiredParameters = @delegate.Method.GetParameters();
if (requiredParameters.Length > argv.Length)
{
foreach (var toRelease in argv)
{
host.Release(toRelease);
}
// This exception will be passed properly to JS
throw new InvalidOperationException($"We need at least {requiredParameters.Length} arguments!");
}
var mappedArgs = new object[requiredParameters.Length];
for (var c = 0; c < requiredParameters.Length; c++)
{
var paramType = requiredParameters[c].ParameterType;
if (!argv[c].TryGetObject(host, paramType, out object parameter))
{
// Release remaining arguments
foreach (var toRelease in argv.Skip(c + 1))
{
host.Release(toRelease);
}
throw new InvalidOperationException($"Cannot get {paramType.FullName} from JS handle of type {argv[c].Type}");
}
mappedArgs[c] = parameter;
}
// Release remaining arguments
foreach (var toRelease in argv.Skip(mappedArgs.Length))
{
host.Release(toRelease);
}
var resultObj = @delegate.DynamicInvoke(mappedArgs);
return(DotNetValue.FromObject(resultObj, host));
}
private DotNetValue InvokeDelegate(JsValue[] argv)
{
ReleaseRemainingArgs(argv, 0);
return(DotNetValue.FromObject(_func(), Host));
}
// TODO DM 24.11.2019: This would require another bunch of reflection code to get working...
/*
* public TaskAwaiter GetAwaiter()
* {
* if (TryConvertIntern(typeof(Task), out object task))
* {
* return ((Task)task).GetAwaiter();
* }
* throw new InvalidOperationException("JS object is not awaitable");
* }*/
internal bool TryConvertIntern(Type type, out object result)
{
// Converting to string.
if (type == typeof(object) || type.IsAssignableFrom(GetType()))
{
result = this;
return(true);
}
//Console.WriteLine($"Converting to {type.Name}");
if (type == typeof(string))
{
var jsResult = _host.InvokeByName("String",
JsValue.Global,
1,
new DotNetValue[]
{
DotNetValue.FromJsValue(Handle)
});
var gotString = jsResult.TryGetObject(_host, typeof(string), out result);
if (!gotString)
{
return(false);
}
return(result is string);
}
if (typeof(Task).IsAssignableFrom(type))
{
var thenHandle = _host.GetMember(Handle, "then");
try
{
// Ensure that Handle is a thenable/promise like object
if (thenHandle.Type == JsType.Function)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Task <>))
{
// TODO DM 24.11.2019: This is inefficient. We need to do this in the native code somehow...
// How about _host.AttachTaskToPromise(Action<JsValue>,Action<JsValue>)?
var resultType = type.GetGenericArguments()[0];
var completionSourceType = typeof(TaskCompletionSource <>).MakeGenericType(resultType);
var tcs = Activator.CreateInstance(completionSourceType);
var resolve = Delegate.CreateDelegate(typeof(Action <>).MakeGenericType(resultType),
tcs,
completionSourceType.GetMethod(nameof(TaskCompletionSource <object> .SetResult)));
var reject = new Action <object>(error =>
{
completionSourceType.GetMethod(nameof(TaskCompletionSource <object> .SetException))
.Invoke(tcs, new object[] { GetExceptionFromPromiseRejection(error) });
});
var thenResult = _host.Invoke(thenHandle,
Handle,
2,
new[]
{
DotNetValue.FromDelegate(resolve, _host),
DotNetValue.FromDelegate(reject, _host)
});
// DM 29.11.2019: thenResult is always another promise
_host.Release(thenResult);
result = completionSourceType.GetProperty(nameof(TaskCompletionSource <object> .Task))
.GetValue(tcs);
return(true);
}
else
{
var tcs = new TaskCompletionSource <object>();
var thenResult = _host.Invoke(thenHandle,
Handle,
2,
new DotNetValue[]
{
DotNetValue.FromDelegate(new Action(() => tcs.SetResult(null)), _host),
DotNetValue.FromDelegate(new Action <object>((error) => { tcs.SetException(GetExceptionFromPromiseRejection(error)); }), _host)
});
// DM 29.11.2019: thenResult is always another promise
_host.Release(thenResult);
result = tcs.Task;
return(true);
}
}
}
finally
{
_host.Release(thenHandle);
}
result = null;
return(false);
}
if (typeof(Exception).IsAssignableFrom(type))
{
dynamic dynamic = this;
string stack = dynamic.stack;
if (stack != null)
{
result = new InvalidOperationException($"JS Error:\n{stack}");
return(true);
}
result = null;
return(false);
}
if (type.IsArray)
{
var innerType = type.GetElementType();
if (TryConvertToArray(innerType, out result))
{
return(true);
}
result = null;
return(false);
}
if (type.IsGenericType && type.IsInterface)
{
var unclosed = type.GetGenericTypeDefinition();
if (unclosed == typeof(IEnumerable <>) || unclosed == typeof(IReadOnlyCollection <>))
{
var innerType = type.GetGenericArguments()[0];
if (TryConvertToArray(innerType, out result))
{
return(true);
}
}
result = null;
return(false);
}
result = null;
return(false);
}
