private JsValue Bind(JsValue thisObj, JsValue[] arguments)
{
if (!(thisObj is ICallable))
{
ExceptionHelper.ThrowTypeError(Engine, "Bind must be called on a function");
}
var thisArg = arguments.At(0);
var f = new BindFunctionInstance(Engine)
{
TargetFunction = thisObj,
BoundThis = thisObj is ArrowFunctionInstance ? Undefined : thisArg,
BoundArgs = arguments.Skip(1),
_prototype = Engine.Function.PrototypeObject,
};
JsNumber l;
var targetHasLength = thisObj.HasOwnProperty(CommonProperties.Length);
if (targetHasLength)
{
var targetLen = thisObj.Get(CommonProperties.Length);
if (!targetLen.IsNumber())
{
l = JsNumber.PositiveZero;
}
else
{
targetLen = TypeConverter.ToInteger(targetLen);
// first argument is target
var argumentsLength = System.Math.Max(0, arguments.Length - 1);
l = JsNumber.Create((uint)System.Math.Max(((JsNumber)targetLen)._value - argumentsLength, 0));
}
}
else
{
l = JsNumber.PositiveZero;
}
f._length = new PropertyDescriptor(l, PropertyFlag.Configurable);
var targetName = thisObj.Get(CommonProperties.Name);
if (!targetName.IsString())
{
targetName = JsString.Empty;
}
f.SetFunctionName(targetName, "bound");
return(f);
}
private static ObjectInstance GetPrototypeFromConstructor(JsValue constructor, ObjectInstance intrinsicDefaultProto)
{
var proto = constructor.Get(CommonProperties.Prototype, constructor) as ObjectInstance;
// If Type(proto) is not Object, then
// Let realm be ? GetFunctionRealm(constructor).
// Set proto to realm's intrinsic object named intrinsicDefaultProto.
return(proto ?? intrinsicDefaultProto);
}
public static void Call(this JsValue controller, GameEngine engine, string function, params object[] args)
{
if (engine.GetValue(controller, function).IsUndefined())
{
return;
}
engine.Invoke(controller.Get(function), controller, args);
}
internal ObjectInstance GetPrototypeFromConstructor(JsValue constructor, Func <Intrinsics, ObjectInstance> intrinsicDefaultProto)
{
var proto = constructor.Get(CommonProperties.Prototype, constructor) as ObjectInstance;
if (proto is null)
{
var realm = GetFunctionRealm(constructor);
proto = intrinsicDefaultProto(realm.Intrinsics);
}
return(proto);
}
private static JsValue InternalizeJSONProperty(JsValue holder, JsValue name, ICallable reviver)
{
JsValue temp = holder.Get(name, holder);
if (temp is ObjectInstance val)
{
if (val.IsArray())
{
var i = 0UL;
var len = TypeConverter.ToLength(val.Get(CommonProperties.Length));
while (i < len)
{
var prop = JsString.Create(i);
var newElement = InternalizeJSONProperty(val, prop, reviver);
if (newElement.IsUndefined())
{
val.Delete(prop);
}
else
{
val.CreateDataProperty(prop, newElement);
}
i = i + 1;
}
}
else
{
var keys = val.EnumerableOwnPropertyNames(EnumerableOwnPropertyNamesKind.Key);
foreach (var p in keys)
{
var newElement = InternalizeJSONProperty(val, p, reviver);
if (newElement.IsUndefined())
{
val.Delete(p);
}
else
{
val.CreateDataProperty(p, newElement);
}
}
}
}
return(reviver.Call(holder, new[] { name, temp }));
}
/// <summary>
/// https://tc39.es/ecma262/#sec-function.prototype.bind
/// </summary>
private JsValue Bind(JsValue thisObj, JsValue[] arguments)
{
if (thisObj is not ICallable)
{
ExceptionHelper.ThrowTypeError(_realm, "Bind must be called on a function");
}
var thisArg = arguments.At(0);
var f = BoundFunctionCreate((ObjectInstance)thisObj, thisArg, arguments.Skip(1));
JsNumber l;
var targetHasLength = thisObj.HasOwnProperty(CommonProperties.Length);
if (targetHasLength)
{
var targetLen = thisObj.Get(CommonProperties.Length);
if (targetLen is not JsNumber number)
{
l = JsNumber.PositiveZero;
}
else
{
if (number.IsPositiveInfinity())
{
l = number;
}
else if (number.IsNegativeInfinity())
{
l = JsNumber.PositiveZero;
}
else
{
var targetLenAsInt = (long)TypeConverter.ToIntegerOrInfinity(targetLen);
// first argument is target
var argumentsLength = System.Math.Max(0, arguments.Length - 1);
l = JsNumber.Create((ulong)System.Math.Max(targetLenAsInt - argumentsLength, 0));
}
}
}
static string AddFlagIfPresent(JsValue o, JsValue p, char flag, string s)
{
return(TypeConverter.ToBoolean(o.Get(p)) ? s + flag : s);
}
