0ba81dc0b7
It's way too easy to get this wrong: for the IsArray abstract operation, Value::is_array() needs to be called. Since we have RTTI, the virtual Object::is_array() method is not needed anymore - if we need to know whether something is *actually* a JS::Array (we currently check in more cases than we should, I think) and not a Proxy with an Array target, we should do that in a way that doesn't look like an abstract operation.
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2020-2021, 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/Function.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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// 10.4.2.2 ArrayCreate ( length [ , proto ] ), https://tc39.es/ecma262/#sec-arraycreate
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Array* Array::create(GlobalObject& global_object, size_t length, Object* prototype)
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{
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auto& vm = global_object.vm();
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if (length > NumericLimits<u32>::max()) {
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vm.throw_exception<RangeError>(global_object, ErrorType::InvalidLength, "array");
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return nullptr;
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}
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if (!prototype)
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prototype = global_object.array_prototype();
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auto* array = global_object.heap().allocate<Array>(global_object, *prototype);
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array->internal_define_own_property(vm.names.length, { .value = Value(length), .writable = true, .enumerable = false, .configurable = false });
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return array;
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}
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// 7.3.17 CreateArrayFromList ( elements ), https://tc39.es/ecma262/#sec-createarrayfromlist
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Array* Array::create_from(GlobalObject& global_object, Vector<Value> const& elements)
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{
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// 1. Assert: elements is a List whose elements are all ECMAScript language values.
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// 2. Let array be ! ArrayCreate(0).
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auto* array = Array::create(global_object, 0);
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// 3. Let n be 0.
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// 4. For each element e of elements, do
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for (u32 n = 0; n < elements.size(); ++n) {
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// a. Perform ! CreateDataPropertyOrThrow(array, ! ToString(𝔽(n)), e).
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array->create_data_property_or_throw(n, elements[n]);
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// b. Set n to n + 1.
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}
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// 5. Return array.
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return array;
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}
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Array::Array(Object& prototype)
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: Object(prototype)
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{
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}
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void Array::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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Object::initialize(global_object);
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define_native_property(vm.names.length, length_getter, length_setter, Attribute::Writable);
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}
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Array::~Array()
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{
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}
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Array* Array::typed_this(VM& vm, GlobalObject& global_object)
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{
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auto* this_object = vm.this_value(global_object).to_object(global_object);
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if (!this_object)
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return {};
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if (!is<Array>(this_object)) {
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vm.throw_exception<TypeError>(global_object, ErrorType::NotAn, "Array");
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return nullptr;
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}
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return static_cast<Array*>(this_object);
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}
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JS_DEFINE_NATIVE_GETTER(Array::length_getter)
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{
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auto* this_object = vm.this_value(global_object).to_object(global_object);
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if (!this_object)
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return {};
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return Value(this_object->indexed_properties().array_like_size());
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}
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JS_DEFINE_NATIVE_SETTER(Array::length_setter)
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{
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auto* this_object = vm.this_value(global_object).to_object(global_object);
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if (!this_object)
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return;
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auto length = value.to_number(global_object);
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if (vm.exception())
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return;
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u32 val = length.as_double();
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if (val != length.as_double()
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|| length.is_nan()
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|| length.is_infinity()
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|| length.as_double() < 0
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|| length.as_double() > NumericLimits<u32>::max()) {
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vm.throw_exception<RangeError>(global_object, ErrorType::InvalidLength, "array");
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return;
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}
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this_object->indexed_properties().set_array_like_size(val);
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}
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}
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