1c3eef5317
Letting these create and return a JS::Array directly is pretty awkward since we then need to go through the indexed properties for iteration. Just use a MarkedValueList (i.e. Vector<Value>) for this and add a new Array::create_from() function to turn the Vector into a returnable Array as we did before. This brings it a lot closer to the spec as well, which uses the CreateArrayFromList abstract operation to do exactly this. There's an optimization opportunity for the future here, since we know the Vector's size we could prepare the newly created Array accordingly, e.g. by switching to generic storage upfront if needed.
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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Array* Array::create(GlobalObject& global_object)
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{
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return global_object.heap().allocate<Array>(global_object, *global_object.array_prototype());
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}
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// 7.3.17 CreateArrayFromList, https://tc39.es/ecma262/#sec-createarrayfromlist
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Array* Array::create_from(GlobalObject& global_object, const Vector<Value>& values)
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{
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auto* array = Array::create(global_object);
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for (size_t i = 0; i < values.size(); ++i)
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array->define_property(i, values[i]);
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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 (!this_object->is_array()) {
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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* array = typed_this(vm, global_object);
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if (!array)
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return {};
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return Value(array->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* array = typed_this(vm, global_object);
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if (!array)
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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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if (length.is_nan() || length.is_infinity() || length.as_double() < 0) {
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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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array->indexed_properties().set_array_like_size(length.as_double());
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}
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}
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