/// <summary>
/// Creates a new Promise instance.
/// </summary>
/// <param name="prototype"></param>
/// <param name="executor"></param>
internal PromiseInstance(ObjectInstance prototype, FunctionInstance executor) : base(prototype)
{
FunctionInstance resolveFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
this.state = PromiseState.Fulfilled;
if (param.Length > 0)
{
result = param[0];
}
return(Undefined.Value);
});
FunctionInstance rejectFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
this.state = PromiseState.Rejected;
if (param.Length > 0)
{
result = param[0];
}
return(Undefined.Value);
});
try
{
executor.Call(Undefined.Value, resolveFunc, rejectFunc);
}
catch (JavaScriptException ex)
{
rejectFunc.Call(Undefined.Value, ex.ErrorObject);
}
}
public PromiseInstance Reject(object reason)
{
ClrStubFunction func = new ClrStubFunction(this.Engine.FunctionInstancePrototype, (engine, thisObj, args) =>
{
FunctionInstance resolve = (FunctionInstance)args[0];
FunctionInstance reject = (FunctionInstance)args[1];
reject.Call(thisObj, reason);
return(Undefined.Value);
});
return(this.Construct(func));
}
public PromiseInstance Then(object onFulfilled, object onRejected)
{
// Get the @@species constructor, if one exists.
var constructor = TypeUtilities.GetSpeciesConstructor(this, Engine.Promise);
// Create a new promise instance.
var executor = new ClrStubFunction(Engine.FunctionInstancePrototype, "", 2, (engine, thisObj, args) => Undefined.Value);
var result = constructor.ConstructLateBound(constructor, executor);
if (result is PromiseInstance resultPromise)
{
return(PerformPromiseThen(onFulfilled as FunctionInstance, onRejected as FunctionInstance, resultPromise));
}
throw new JavaScriptException(ErrorType.TypeError, "Subclassed promises are not supported.");
}
/// <summary>
/// Creates a new Promise instance.
/// </summary>
/// <param name="prototype"></param>
/// <param name="executor"></param>
internal PromiseInstance(ObjectInstance prototype, FunctionInstance executor) : base(prototype)
{
FunctionInstance resolveFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
return(Undefined.Value);
});
FunctionInstance rejectFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
return(Undefined.Value);
});
try
{
executor.Call(Undefined.Value, resolveFunc, rejectFunc);
}
catch (JavaScriptException ex)
{
rejectFunc.Call(Undefined.Value, ex.ErrorObject);
}
}
/// <summary>
/// Creates a new Promise instance.
/// </summary>
/// <param name="prototype"></param>
/// <param name="executor"></param>
internal PromiseInstance(ObjectInstance prototype, FunctionInstance executor)
: base(prototype)
{
FunctionInstance resolveFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
return Undefined.Value;
});
FunctionInstance rejectFunc = new ClrStubFunction(Engine.FunctionInstancePrototype, (engine, thisObj, param) =>
{
return Undefined.Value;
});
try
{
executor.Call(Undefined.Value, resolveFunc, rejectFunc);
}
catch (JavaScriptException ex)
{
rejectFunc.Call(Undefined.Value, ex.ErrorObject);
}
}
public PromiseInstance All(ObjectInstance iterable)
{
if (iterable == null)
{
throw new JavaScriptException(iterable.Engine, ErrorType.TypeError, "The parameter must be an iterable.");
}
var iterator = TypeUtilities.GetIterator(iterable.Engine, iterable);
var promises = TypeUtilities.Iterate(iterator.Engine, iterator).ToList();
var results = Engine.Array.Construct(new object[promises.Count]);
var count = promises.Count;
var promise = new PromiseInstance(iterable.Engine.Promise.InstancePrototype);
// The promise is resolved immediately if the iterable is empty.
if (promises.Count == 0)
{
promise.Resolve(results);
return(promise);
}
for (var i = 0; i < promises.Count; i++)
{
if (promise.State != PromiseState.Pending)
{
break;
}
if (promises[i] is PromiseInstance p)
{
if (p.State == PromiseState.Rejected)
{
promise.Reject(p.Result);
break;
}
else if (p.State == PromiseState.Fulfilled)
{
results[i] = p.Result;
if (--count == 0)
{
promise.Resolve(results);
break;
}
continue;
}
var j = i; // Some C# versions need this.
p.Then(new ClrStubFunction(Engine.FunctionInstancePrototype, "", 1, (engine, thisObj, args) =>
{
if (promise.State != PromiseState.Pending)
{
return(Undefined.Value);
}
results[j] = args[0];
if (--count == 0)
{
promise.Resolve(results);
}
return(Undefined.Value);
}),
new ClrStubFunction(Engine.FunctionInstancePrototype, "", 1, (engine, thisObj, args) =>
{
promise.Reject(args[0]);
return(Undefined.Value);
}));
continue;
}
else if (promises[i] is ObjectInstance obj && obj.HasProperty("then"))
{
FunctionInstance then;
try
{
then = obj.GetPropertyValue("then") as FunctionInstance;
}
catch (JavaScriptException jex)
{
promise.Reject(jex.ErrorObject);
break;
}
if (then != null)
{
try
{
var j = i; // Some C# versions need this.
var resolve = new ClrStubFunction(iterable.Engine.Function.InstancePrototype, (engine, ths, arg) =>
{
if (promise.State != PromiseState.Pending)
{
return(Undefined.Value);
}
results[j] = arg.Length == 0
? Undefined.Value
: arg[0];
if (--count == 0)
{
promise.Resolve(results);
}
return(Undefined.Value);
});
then.Call(obj, resolve, promise.RejectFunction);
continue;
}
catch (JavaScriptException jex)
{
promise.Reject(jex.ErrorObject);
break;
}
}
}
results[i] = promises[i];
if (--count == 0)
{
promise.Resolve(results);
break;
}
}
return(promise);
}
/// <summary>
/// Initializes a single deprecated property.
/// </summary>
/// <param name="properties"> The list to add to. </param>
/// <param name="propertyName"> The name of the property. </param>
/// <param name="getter"> The property getter. </param>
/// <param name="attributes"> The property attributes (determines whether the property is enumerable). </param>
private void AddDeprecatedProperty(List<PropertyNameAndValue> properties, string propertyName, Func<ScriptEngine, object, object[], object> getter, PropertyAttributes attributes)
{
var getterFunction = new ClrStubFunction(this.Engine.Function.InstancePrototype, getter);
properties.Add(new PropertyNameAndValue(propertyName, new PropertyDescriptor(new PropertyAccessorValue(getterFunction, null), attributes)));
}
/// <summary>
/// Initializes a single deprecated property.
/// </summary>
/// <param name="properties"> The list to add to. </param>
/// <param name="propertyName"> The name of the property. </param>
/// <param name="getter"> The property getter. </param>
/// <param name="attributes"> The property attributes (determines whether the property is enumerable). </param>
private void AddDeprecatedProperty(List <PropertyNameAndValue> properties, string propertyName, Func <ScriptEngine, object, object[], object> getter, PropertyAttributes attributes)
{
var getterFunction = new ClrStubFunction(this.Engine.Function.InstancePrototype, getter);
properties.Add(new PropertyNameAndValue(propertyName, new PropertyDescriptor(new PropertyAccessorValue(getterFunction, null), attributes)));
}
public PromiseInstance Resolve(object x)
{
ClrStubFunction func = new ClrStubFunction(this.Engine.FunctionInstancePrototype, (engine, thisObj, args) =>
{
FunctionInstance resolve = (FunctionInstance)args[0];
FunctionInstance reject = (FunctionInstance)args[1];
resolve.Call(thisObj, x);
return Undefined.Value;
});
return this.Construct(func);
}
