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90 lines
2.6 KiB
C++
90 lines
2.6 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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static unsigned hash_impl(FlyString const& local_name, Optional<FlyString> const& prefix, Optional<FlyString> const& namespace_)
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{
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unsigned hash = local_name.hash();
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if (prefix.has_value())
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hash = pair_int_hash(hash, prefix->hash());
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if (namespace_.has_value())
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hash = pair_int_hash(hash, namespace_->hash());
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return hash;
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}
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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 hash_impl(impl->local_name, impl->prefix, impl->namespace_);
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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, Optional<FlyString> const& prefix, Optional<FlyString> const& namespace_)
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{
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unsigned hash = hash_impl(local_name, prefix, namespace_);
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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, Optional<FlyString> const& prefix, Optional<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, Optional<FlyString> const& a_prefix, Optional<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.has_value()) {
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as_string = local_name;
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return;
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}
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as_string = MUST(String::formatted("{}:{}", prefix.value(), local_name));
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}
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void QualifiedName::set_prefix(Optional<FlyString> value)
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{
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m_impl->prefix = move(value);
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}
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}
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