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cf5eeb9f4b
Adopt the same pattern as AK::FlyString, reducing sizeof(QualifiedName) to the size of a pointer. This reduces the size of DOM::Element by 24 bytes.
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/*
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* Copyright (c) 2022, Andreas Kling <kling@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/HashTable.h>
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#include <LibWeb/DOM/QualifiedName.h>
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namespace Web::DOM {
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struct ImplTraits : public Traits<QualifiedName::Impl*> {
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static unsigned hash(QualifiedName::Impl* impl)
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{
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return pair_int_hash(impl->local_name.hash(), pair_int_hash(impl->prefix.hash(), impl->namespace_.hash()));
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}
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static bool equals(QualifiedName::Impl* a, QualifiedName::Impl* b)
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{
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return a->local_name == b->local_name
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&& a->prefix == b->prefix
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&& a->namespace_ == b->namespace_;
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}
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};
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static HashTable<QualifiedName::Impl*, ImplTraits> impls;
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static NonnullRefPtr<QualifiedName::Impl> ensure_impl(FlyString const& local_name, FlyString const& prefix, FlyString const& namespace_)
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{
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auto hash = pair_int_hash(local_name.hash(), pair_int_hash(prefix.hash(), namespace_.hash()));
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auto it = impls.find(hash, [&](QualifiedName::Impl* entry) {
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return entry->local_name == local_name
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&& entry->prefix == prefix
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&& entry->namespace_ == namespace_;
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});
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if (it != impls.end())
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return *(*it);
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return adopt_ref(*new QualifiedName::Impl(local_name, prefix, namespace_));
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}
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QualifiedName::QualifiedName(FlyString const& local_name, FlyString const& prefix, FlyString const& namespace_)
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: m_impl(ensure_impl(local_name, prefix, namespace_))
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{
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}
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QualifiedName::Impl::Impl(FlyString const& a_local_name, FlyString const& a_prefix, FlyString const& a_namespace)
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: local_name(a_local_name)
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, prefix(a_prefix)
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, namespace_(a_namespace)
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{
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impls.set(this);
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make_internal_string();
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}
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QualifiedName::Impl::~Impl()
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{
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impls.remove(this);
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}
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// https://dom.spec.whatwg.org/#concept-attribute-qualified-name
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// https://dom.spec.whatwg.org/#concept-element-qualified-name
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void QualifiedName::Impl::make_internal_string()
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{
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// This is possible to do according to the spec: "User agents could have this as an internal slot as an optimization."
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if (prefix.is_null()) {
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as_string = local_name;
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return;
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}
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as_string = String::formatted("{}:{}", prefix, local_name);
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}
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}
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