public static EcmaValue ConstructTypedArray(TypedArrayKind kind, EcmaValue thisValue, EcmaValue[] args)
{
TypedArray array = thisValue.GetUnderlyingObject <TypedArray>();
if (args.Length == 0)
{
array.Init(0);
return(thisValue);
}
if (args[0].Type != EcmaValueType.Object)
{
array.Init(args[0].ToIndex());
return(thisValue);
}
RuntimeObject obj = args[0].ToObject();
long bytesPerElement = array.ElementSize;
if (obj is TypedArray srcArray)
{
Guard.BufferNotDetached(srcArray);
RuntimeObject bufferConstructor;
if (srcArray.Buffer.IsShared)
{
bufferConstructor = srcArray.Realm.GetRuntimeObject(WellKnownObject.ArrayBuffer);
}
else
{
bufferConstructor = RuntimeObject.GetSpeciesConstructor(srcArray.Buffer, WellKnownObject.ArrayBuffer);
}
if (srcArray.ArrayKind == kind)
{
ArrayBuffer buffer = srcArray.Buffer.Clone(srcArray.ByteOffset, bytesPerElement * srcArray.Length, bufferConstructor);
array.Init(buffer);
}
else
{
ArrayBuffer buffer = ArrayBuffer.AllocateArrayBuffer(bufferConstructor, bytesPerElement * srcArray.Length);
Guard.BufferNotDetached(srcArray);
array.Init(buffer);
for (int i = 0, j = 0, count = srcArray.Length; i < count; i++, j++)
{
array.SetValueInBuffer(j, srcArray.GetValueFromBuffer(i));
}
}
return(thisValue);
}
if (obj is ArrayBuffer srcBuffer)
{
long offset = args.Length > 1 ? args[1].ToIndex() : 0;
if ((offset % bytesPerElement) != 0)
{
throw new EcmaRangeErrorException(InternalString.Error.TypedArrayInvalidOffset, TypedArrayInfo.GetTypedArrayName(array.ArrayKind), bytesPerElement);
}
long length;
if (args.Length <= 2 || args[2] == default)
{
Guard.BufferNotDetached(srcBuffer);
if ((srcBuffer.ByteLength % bytesPerElement) != 0)
{
throw new EcmaRangeErrorException(InternalString.Error.TypedArrayInvalidByteLength, TypedArrayInfo.GetTypedArrayName(array.ArrayKind), bytesPerElement);
}
if (srcBuffer.ByteLength < offset)
{
throw new EcmaRangeErrorException(InternalString.Error.BufferOffsetOutOfBound, offset);
}
length = srcBuffer.ByteLength - offset;
}
else
{
length = args[2].ToIndex() * bytesPerElement;
Guard.BufferNotDetached(srcBuffer);
if (offset + length > srcBuffer.ByteLength)
{
throw new EcmaRangeErrorException(InternalString.Error.TypedArrayInvalidLength, length);
}
}
array.Init(srcBuffer, offset, length);
return(thisValue);
}
RuntimeObject iterator = obj.GetMethod(WellKnownSymbol.Iterator);
if (iterator != null)
{
List <EcmaValue> values = new List <EcmaValue>(obj.GetIterator());
array.Init(values.Count);
int i = 0;
foreach (EcmaValue v in values)
{
array.Set(i++, v);
}
}
else
{
long length = obj[WellKnownProperty.Length].ToLength();
array.Init((int)length);
for (int i = 0; i < length; i++)
{
array.Set(i, obj[i]);
}
}
return(thisValue);
}