mirror of
https://github.com/RGBCube/serenity
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95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020-2023, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/TypeCasts.h>
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#include <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/ArrayBufferConstructor.h>
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#include <LibJS/Runtime/DataView.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/TypedArray.h>
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namespace JS {
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ArrayBufferConstructor::ArrayBufferConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.ArrayBuffer.as_string(), realm.intrinsics().function_prototype())
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{
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}
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void ArrayBufferConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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Base::initialize(realm);
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// 25.1.4.2 ArrayBuffer.prototype, https://tc39.es/ecma262/#sec-arraybuffer.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().array_buffer_prototype(), 0);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(realm, vm.names.isView, is_view, 1, attr);
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// 25.1.5.4 ArrayBuffer.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-arraybuffer.prototype-@@tostringtag
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define_native_accessor(realm, vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
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ThrowCompletionOr<Value> ArrayBufferConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
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}
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// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
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ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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// 2. Let byteLength be ? ToIndex(length).
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auto byte_length_or_error = vm.argument(0).to_index(vm);
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if (byte_length_or_error.is_error()) {
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auto error = byte_length_or_error.release_error();
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if (error.value()->is_object() && is<RangeError>(error.value()->as_object())) {
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// Re-throw more specific RangeError
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return vm.throw_completion<RangeError>(ErrorType::InvalidLength, "array buffer");
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}
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return error;
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}
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// 3. Return ? AllocateArrayBuffer(NewTarget, byteLength).
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return *TRY(allocate_array_buffer(vm, new_target, byte_length_or_error.release_value()));
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}
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// 25.1.4.1 ArrayBuffer.isView ( arg ), https://tc39.es/ecma262/#sec-arraybuffer.isview
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JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::is_view)
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{
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auto arg = vm.argument(0);
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// 1. If arg is not an Object, return false.
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if (!arg.is_object())
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return Value(false);
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// 2. If arg has a [[ViewedArrayBuffer]] internal slot, return true.
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if (arg.as_object().is_typed_array())
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return Value(true);
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if (is<DataView>(arg.as_object()))
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return Value(true);
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// 3. Return false.
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return Value(false);
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}
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// 25.1.4.3 get ArrayBuffer [ @@species ], https://tc39.es/ecma262/#sec-get-arraybuffer-@@species
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JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::symbol_species_getter)
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{
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// 1. Return the this value.
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return vm.this_value();
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}
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}
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