public bool TryCreatePrototypeFunction(BaristaContext context, Type typeToConvert, out JsFunction ctor)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (typeToConvert == null)
{
throw new ArgumentNullException(nameof(typeToConvert));
}
if (m_prototypes.ContainsKey(typeToConvert))
{
ctor = m_prototypes[typeToConvert];
return(true);
}
var reflector = new ObjectReflector(typeToConvert);
JsFunction superCtor = null;
var baseType = reflector.GetBaseType();
if (baseType != null && !baseType.IsSameOrSubclass(typeof(JsValue)) && TryCreatePrototypeFunction(context, baseType, out JsFunction fnSuper))
{
superCtor = fnSuper;
}
var objectName = BaristaObjectAttribute.GetBaristaObjectNameFromType(typeToConvert);
//Get all the property descriptors for the specified type.
var staticPropertyDescriptors = context.CreateObject();
var instancePropertyDescriptors = context.CreateObject();
//Get static and instance properties.
ProjectProperties(context, staticPropertyDescriptors, reflector.GetProperties(false));
ProjectProperties(context, instancePropertyDescriptors, reflector.GetProperties(true));
//Get static and instance indexer properties.
ProjectIndexerProperties(context, staticPropertyDescriptors, reflector.GetIndexerProperties(false));
ProjectIndexerProperties(context, instancePropertyDescriptors, reflector.GetIndexerProperties(true));
//Get static and instance methods.
ProjectMethods(context, staticPropertyDescriptors, reflector, reflector.GetUniqueMethodsByName(false));
ProjectMethods(context, instancePropertyDescriptors, reflector, reflector.GetUniqueMethodsByName(true));
//Get static and instance events.
ProjectEvents(context, staticPropertyDescriptors, reflector, reflector.GetEventTable(false));
ProjectEvents(context, instancePropertyDescriptors, reflector, reflector.GetEventTable(true));
//Get the [[iterator]] property.
ProjectIEnumerable(context, instancePropertyDescriptors, reflector);
JsFunction fnCtor;
var publicConstructors = reflector.GetConstructors();
if (publicConstructors.Any())
{
fnCtor = context.CreateFunction(new BaristaFunctionDelegate((calleeObj, isConstructCall, thisObj, args) =>
{
if (thisObj == null)
{
var ex = context.CreateTypeError($"Failed to construct '{objectName}': 'this' must be specified.");
context.CurrentScope.SetException(ex);
return(context.Undefined);
}
if (superCtor != null)
{
superCtor.Call(thisObj);
}
context.Object.DefineProperties(thisObj, instancePropertyDescriptors);
//If this isn't a construct call, don't attempt to set the bean
if (!isConstructCall)
{
return(thisObj);
}
//Set our native object.
JsExternalObject externalObject = null;
//!!Special condition -- if there's exactly one argument, and if it matches the enclosing type,
//don't invoke the type's constructor, rather, just wrap the object with the JsObject.
if (args.Length == 1 && args[0].GetType() == typeToConvert)
{
externalObject = context.CreateExternalObject(args[0]);
}
else
{
try
{
var bestConstructor = reflector.GetConstructorBestMatch(args);
if (bestConstructor == null)
{
var ex = context.CreateTypeError($"Failed to construct '{objectName}': Could not find a matching constructor for the provided arguments.");
context.CurrentScope.SetException(ex);
return(context.Undefined);
}
//Convert the args into the native args of the constructor.
var constructorParams = bestConstructor.GetParameters();
var convertedArgs = ConvertArgsToParamTypes(context, args, constructorParams);
var newObj = bestConstructor.Invoke(convertedArgs);
externalObject = context.CreateExternalObject(newObj);
}
catch (Exception ex)
{
context.CurrentScope.SetException(context.CreateError(ex.Message));
return(context.Undefined);
}
}
thisObj.SetBean(externalObject);
return(thisObj);
}), objectName);
}
else
{
fnCtor = context.CreateFunction(new BaristaFunctionDelegate((calleeObj, isConstructCall, thisObj, args) =>
{
var ex = context.CreateTypeError($"Failed to construct '{objectName}': This object cannot be constructed.");
context.CurrentScope.SetException(ex);
return(context.Undefined);
}), objectName);
}
//We've got everything we need.
fnCtor.Prototype = context.Object.Create(superCtor == null ? context.Object.Prototype : superCtor.Prototype);
context.Object.DefineProperties(fnCtor, staticPropertyDescriptors);
m_prototypes.Add(typeToConvert, fnCtor);
ctor = fnCtor;
return(true);
}
private JavaScriptProjection InitializeProjectionForType(Type t)
{
var eng = GetEngineAndClaimContext();
ObjectReflector reflector = ObjectReflector.Create(t);
JavaScriptProjection baseTypeProjection = null;
if (reflector.HasBaseType)
{
Type baseType = reflector.GetBaseType();
if (!projectionTypes_.TryGetValue(baseType, out baseTypeProjection))
{
baseTypeProjection = InitializeProjectionForType(baseType);
baseTypeProjection.RefCount += 1;
projectionTypes_[baseType] = baseTypeProjection;
}
}
var publicConstructors = reflector.GetConstructors();
var publicInstanceProperties = reflector.GetProperties(instance: true);
var publicStaticProperties = reflector.GetProperties(instance: false);
var publicInstanceMethods = reflector.GetMethods(instance: true);
var publicStaticMethods = reflector.GetMethods(instance: false);
var publicInstanceEvents = reflector.GetEvents(instance: true);
var publicStaticEvents = reflector.GetEvents(instance: false);
if (AnyHaveSameArity(out var duplicateName, publicConstructors, publicInstanceMethods, publicStaticMethods, publicInstanceProperties, publicStaticProperties))
{
throw new InvalidOperationException("The specified type cannot be marshaled; some publicly accessible members have the same arity. Projected methods can't differentiate only by type (e.g., Add(int, int) and Add(float, float) would cause this error): " + t.FullName + "::" + duplicateName);
}
JavaScriptFunction ctor;
if (publicConstructors.Any())
{
// e.g. var MyObject = function() { [native code] };
ctor = eng.CreateFunction((engine, constr, thisObj, args) =>
{
// todo
return(FromObject(publicConstructors.First().Invoke(new object[] { })));
}, t.FullName);
}
else
{
ctor = eng.CreateFunction((engine, constr, thisObj, args) =>
{
return(eng.UndefinedValue);
}, t.FullName);
}
// MyObject.prototype = Object.create(baseTypeProjection.PrototypeObject);
var prototypeObj = CreateObjectFor(eng, baseTypeProjection);
ctor.SetPropertyByName("prototype", prototypeObj);
// MyObject.prototype.constructor = MyObject;
prototypeObj.SetPropertyByName("constructor", ctor);
// MyObject.CreateMyObject = function() { [native code] };
ProjectMethods(t.FullName, ctor, eng, publicStaticMethods);
// Object.defineProperty(MyObject, 'Foo', { get: function() { [native code] } });
ProjectProperties(t.FullName, ctor, eng, publicStaticProperties);
// MyObject.addEventListener = function() { [native code] };
if ((baseTypeProjection?.HasStaticEvents ?? false) || publicStaticEvents.Any())
{
ProjectEvents(t.FullName, ctor, eng, publicStaticEvents, baseTypeProjection, instance: false);
}
// MyObject.prototype.ToString = function() { [native code] };
ProjectMethods(t.FullName + ".prototype", prototypeObj, eng, publicInstanceMethods);
// Object.defineProperty(MyObject.prototype, 'baz', { get: function() { [native code] }, set: function() { [native code] } });
ProjectProperties(t.FullName + ".prototype", prototypeObj, eng, publicInstanceProperties);
// MyObject.prototype.addEventListener = function() { [native code] };
if ((baseTypeProjection?.HasInstanceEvents ?? false) || publicInstanceEvents.Any())
{
ProjectEvents(t.FullName + ".prototype", prototypeObj, eng, publicInstanceEvents, baseTypeProjection, instance: true);
}
prototypeObj.Freeze();
return(new JavaScriptProjection
{
RefCount = 0,
Constructor = ctor,
Prototype = prototypeObj,
HasInstanceEvents = (baseTypeProjection?.HasInstanceEvents ?? false) || publicInstanceEvents.Any(),
HasStaticEvents = (baseTypeProjection?.HasStaticEvents ?? false) || publicStaticEvents.Any(),
});
}
