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7327a28ccc
As mentioned on Discord earlier, we'll add these to all new functions going forward - this is the backfill. Reasons: - It makes you look at the spec, implementing based on MDN or V8 behavior is a no-go - It makes finding the various functions that are non-compliant easier, in the future everything should either have such a comment or, if it's not from the spec at all, a comment explaining why that is the case - It makes it easier to check whether a certain abstract operation is implemented in LibJS, not all of them use the same name as the spec. E.g. RejectPromise() is Promise::reject() - It makes it easier to reason about vm.arguments(), e.g. when the function has a rest parameter - It makes it easier to see whether a certain function is from a proposal or Annex B Also: - Add arguments to all functions and abstract operations that already had a comment - Fix some outdated section numbers - Replace some ecma-international.org URLs with tc39.es
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
/*
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* Copyright (c) 2020, 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 <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/ArrayBufferConstructor.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(GlobalObject& global_object)
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: NativeFunction(vm().names.ArrayBuffer, *global_object.function_prototype())
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{
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}
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void ArrayBufferConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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// 25.1.4.2 ArrayBuffer.prototype, https://tc39.es/ecma262/#sec-arraybuffer.prototype
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define_property(vm.names.prototype, global_object.array_buffer_prototype(), 0);
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define_property(vm.names.length, Value(1), Attribute::Configurable);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(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(vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
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}
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ArrayBufferConstructor::~ArrayBufferConstructor()
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{
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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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Value ArrayBufferConstructor::call()
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{
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auto& vm = this->vm();
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vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
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return {};
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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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Value ArrayBufferConstructor::construct(Function&)
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{
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auto& vm = this->vm();
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auto byte_length = vm.argument(0).to_index(global_object());
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if (vm.exception()) {
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if (vm.exception()->value().is_object() && is<RangeError>(vm.exception()->value().as_object())) {
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// Re-throw more specific RangeError
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vm.clear_exception();
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vm.throw_exception<RangeError>(global_object(), ErrorType::InvalidLength, "array buffer");
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}
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return {};
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}
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return ArrayBuffer::create(global_object(), byte_length);
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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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if (!arg.is_object())
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return Value(false);
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if (arg.as_object().is_typed_array())
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return Value(true);
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// FIXME: Check for DataView as well
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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_GETTER(ArrayBufferConstructor::symbol_species_getter)
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{
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return vm.this_value(global_object);
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}
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}
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