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ab52d86a69
Expose a method on built-in iterators that allows retrieving the next iteration result without allocating a JS::Object. This change is a preparation for optimizing for..of and for..in loops.
49 lines
1.1 KiB
C++
49 lines
1.1 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 <AK/Utf8View.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/StringIterator.h>
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namespace JS {
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GC_DEFINE_ALLOCATOR(StringIterator);
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GC::Ref<StringIterator> StringIterator::create(Realm& realm, String string)
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{
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return realm.create<StringIterator>(move(string), realm.intrinsics().string_iterator_prototype());
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}
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StringIterator::StringIterator(String string, Object& prototype)
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: Object(ConstructWithPrototypeTag::Tag, prototype)
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, m_string(move(string))
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, m_iterator(Utf8View(m_string).begin())
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{
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}
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ThrowCompletionOr<void> StringIterator::next(VM& vm, bool& done, Value& value)
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{
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if (m_done) {
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done = true;
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value = js_undefined();
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return {};
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}
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if (m_iterator.done()) {
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m_done = true;
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done = true;
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value = js_undefined();
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return {};
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}
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auto code_point = String::from_code_point(*m_iterator);
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++m_iterator;
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value = PrimitiveString::create(vm, move(code_point));
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return {};
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}
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}
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