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https://github.com/zebrajr/ladybird.git
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7ee415a7c2
Our existing implementation was checking if the generator step result was `undefined` to indicate that the generator is complete. This is not sufficient for an upcoming implementation of Iterator.concat, where `undefined` is used as an incomplete iteration result. Instead, let's have the Iterator prototype return an IterationResult to explicitly indicate its completeness. As a result, the prototype also looks more like the spec now.
47 lines
1.5 KiB
C++
47 lines
1.5 KiB
C++
/*
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* Copyright (c) 2023-2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibGC/Function.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/GeneratorObject.h>
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#include <LibJS/Runtime/Iterator.h>
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#include <LibJS/Runtime/Object.h>
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namespace JS {
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class IteratorHelper final : public GeneratorObject {
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JS_OBJECT(IteratorHelper, GeneratorObject);
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GC_DECLARE_ALLOCATOR(IteratorHelper);
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public:
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using Closure = GC::Function<ThrowCompletionOr<IterationResult>(VM&, IteratorHelper&)>;
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using AbruptClosure = GC::Function<ThrowCompletionOr<Value>(VM&, Completion const&)>;
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static GC::Ref<IteratorHelper> create(Realm&, ReadonlySpan<GC::Ref<IteratorRecord>>, GC::Ref<Closure>, GC::Ptr<AbruptClosure> = {});
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ReadonlySpan<GC::Ref<IteratorRecord>> underlying_iterators() const { return m_underlying_iterators; }
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size_t counter() const { return m_counter; }
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void increment_counter() { ++m_counter; }
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private:
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IteratorHelper(Realm&, Object& prototype, ReadonlySpan<GC::Ref<IteratorRecord>>, GC::Ref<Closure>, GC::Ptr<AbruptClosure>);
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virtual void visit_edges(Visitor&) override;
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virtual ThrowCompletionOr<IterationResult> execute(VM&, JS::Completion const& completion) override;
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Vector<GC::Ref<IteratorRecord>> m_underlying_iterators; // [[UnderlyingIterators]]
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GC::Ref<Closure> m_closure;
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GC::Ptr<AbruptClosure> m_abrupt_closure;
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size_t m_counter { 0 };
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bool m_done { false };
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};
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}
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