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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or Annex B Also: - Add arguments to all functions and abstract operations that already had a comment - Fix some outdated section numbers - Replace some ecma-international.org URLs with tc39.es
134 lines
4.1 KiB
C++
134 lines
4.1 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@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/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/IteratorOperations.h>
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namespace JS {
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// 7.4.1 GetIterator ( obj [ , hint [ , method ] ] ), https://tc39.es/ecma262/#sec-getiterator
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Object* get_iterator(GlobalObject& global_object, Value value, IteratorHint hint, Value method)
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{
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auto& vm = global_object.vm();
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if (method.is_empty()) {
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if (hint == IteratorHint::Async)
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TODO();
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auto object = value.to_object(global_object);
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if (!object)
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return {};
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method = object->get(global_object.vm().well_known_symbol_iterator());
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if (vm.exception())
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return {};
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}
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if (!method.is_function()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::NotIterable, value.to_string_without_side_effects());
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return nullptr;
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}
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auto iterator = vm.call(method.as_function(), value);
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if (vm.exception())
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return {};
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if (!iterator.is_object()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::NotIterable, value.to_string_without_side_effects());
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return nullptr;
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}
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return &iterator.as_object();
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}
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// 7.4.2 IteratorNext ( iteratorRecord [ , value ] ), https://tc39.es/ecma262/#sec-iteratornext
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Object* iterator_next(Object& iterator, Value value)
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{
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auto& vm = iterator.vm();
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auto& global_object = iterator.global_object();
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auto next_method = iterator.get(vm.names.next);
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if (vm.exception())
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return {};
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if (!next_method.is_function()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::IterableNextNotAFunction);
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return nullptr;
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}
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Value result;
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if (value.is_empty())
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result = vm.call(next_method.as_function(), &iterator);
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else
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result = vm.call(next_method.as_function(), &iterator, value);
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if (vm.exception())
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return {};
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if (!result.is_object()) {
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vm.throw_exception<TypeError>(global_object, ErrorType::IterableNextBadReturn);
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return nullptr;
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}
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return &result.as_object();
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}
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// 7.4.6 IteratorClose ( iteratorRecord, completion ), https://tc39.es/ecma262/#sec-iteratorclose
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void iterator_close([[maybe_unused]] Object& iterator)
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{
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TODO();
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}
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// 7.4.10 IterableToList ( items [ , method ] ), https://tc39.es/ecma262/#sec-iterabletolist
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MarkedValueList iterable_to_list(GlobalObject& global_object, Value iterable, Value method)
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{
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auto& vm = global_object.vm();
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MarkedValueList values(vm.heap());
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get_iterator_values(
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global_object, iterable, [&](auto value) {
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if (vm.exception())
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return IterationDecision::Break;
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values.append(value);
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return IterationDecision::Continue;
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},
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method);
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return values;
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}
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// 7.4.8 CreateIterResultObject ( value, done ), https://tc39.es/ecma262/#sec-createiterresultobject
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Value create_iterator_result_object(GlobalObject& global_object, Value value, bool done)
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{
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auto& vm = global_object.vm();
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auto* object = Object::create_empty(global_object);
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object->define_property(vm.names.value, value);
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object->define_property(vm.names.done, Value(done));
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return object;
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}
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void get_iterator_values(GlobalObject& global_object, Value value, AK::Function<IterationDecision(Value)> callback, Value method)
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{
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auto& vm = global_object.vm();
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auto iterator = get_iterator(global_object, value, IteratorHint::Sync, method);
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if (!iterator)
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return;
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while (true) {
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auto next_object = iterator_next(*iterator);
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if (!next_object)
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return;
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auto done_property = next_object->get(vm.names.done);
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if (vm.exception())
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return;
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if (!done_property.is_empty() && done_property.to_boolean())
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return;
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auto next_value = next_object->get(vm.names.value);
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if (vm.exception())
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return;
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auto result = callback(next_value);
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if (result == IterationDecision::Break)
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return;
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VERIFY(result == IterationDecision::Continue);
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}
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}
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}
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