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LibJS: Added construction of TypedArray from another

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This commit is contained in:
Amjad Alsharafi 2021-04-07 10:43:22 +03:00 • committed by Andreas Kling
parent 90b6821d3f
commit 5d44544401
1 changed files with 46 additions and 2 deletions
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48
Userland/Libraries/LibJS/Runtime/TypedArray.cpp
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@ -93,6 +93,48 @@ static void initialize_typed_array_from_array_buffer(GlobalObject& global_object
typed_array.set_byte_offset(offset);
typed_array.set_array_length(new_byte_length.value() / element_size);
}
template<typename T>
static void initialize_typed_array_from_typed_array(GlobalObject& global_object, TypedArray<T>& dest_array, TypedArrayBase& src_array)
{
auto& vm = global_object.vm();
if (vm.exception())
return;
// FIXME: 4. If IsDetachedBuffer(src_data) is true, throw a TypeError exception.
VERIFY(src_array.viewed_array_buffer());
auto src_array_length = src_array.array_length();
auto dest_element_size = dest_array.element_size();
Checked byte_length = src_array_length * dest_element_size;
if (byte_length.has_overflow()) {
vm.throw_exception<RangeError>(global_object, ErrorType::InvalidLength, "typed array");
return;
}
// FIXME: 17.b If IsDetachedBuffer(array_buffer) is true, throw a TypeError exception.
// FIXME: 17.c If src_array.[[ContentType]] != dest_array.[[ContentType]], throw a TypeError exception.
auto array_buffer = ArrayBuffer::create(global_object, byte_length.value());
dest_array.set_array_length(src_array_length);
dest_array.set_viewed_array_buffer(array_buffer);
dest_array.set_byte_offset(0);
dest_array.set_byte_length(array_buffer->byte_length());
for (u32 i = 0; i < src_array_length; i++) {
Value v;
#undef __JS_ENUMERATE
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
if (is<JS::ClassName>(src_array)) { \
auto& src = static_cast<JS::ClassName&>(src_array); \
v = src.get_by_index(i); \
}
JS_ENUMERATE_TYPED_ARRAYS
#undef __JS_ENUMERATE
VERIFY(!v.is_empty());
dest_array.put_by_index(i, v);
}
}
void TypedArrayBase::visit_edges(Visitor& visitor)
{
@ -147,8 +189,10 @@ void TypedArrayBase::visit_edges(Visitor& visitor)
if (first_argument.is_object()) { \
auto* typed_array = ClassName::create(global_object(), 0); \
if (first_argument.as_object().is_typed_array()) { \
/* FIXME: Initialize from TypedArray */ \
TODO(); \
auto& arg_typed_array = static_cast<TypedArrayBase&>(first_argument.as_object()); \
initialize_typed_array_from_typed_array(global_object(), *typed_array, arg_typed_array); \
if (vm.exception()) \
return {}; \
} else if (is<ArrayBuffer>(first_argument.as_object())) { \
auto& array_buffer = static_cast<ArrayBuffer&>(first_argument.as_object()); \
initialize_typed_array_from_array_buffer(global_object(), *typed_array, array_buffer, vm.argument(1), vm.argument(2)); \