chromium/third_party/blink/renderer/core/style/scoped_css_name.h

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SCOPED_CSS_NAME_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SCOPED_CSS_NAME_H_

#include "base/memory/values_equivalent.h"
#include "base/ranges/algorithm.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_vector.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"

namespace blink {

class TreeScope;

// Stores a CSS name as an AtomicString along with a TreeScope to support
// tree-scoped names and references for e.g. anchor-name. If the TreeScope
// pointer is null, we do not support such references, for instance for UA
// stylesheets.
class CORE_EXPORT ScopedCSSName : public GarbageCollected<ScopedCSSName> { … };

// Represents a list of tree-scoped names (or tree-scoped references).
//
// https://drafts.csswg.org/css-scoping/#css-tree-scoped-name
// https://drafts.csswg.org/css-scoping/#css-tree-scoped-reference
class CORE_EXPORT ScopedCSSNameList
    : public GarbageCollected<ScopedCSSNameList> { … };

}  // namespace blink

namespace WTF {

// Allows creating a hash table of ScopedCSSName in wrapper pointers (e.g.,
// HeapHashSet<Member<ScopedCSSName>>) that hashes the ScopedCSSNames directly
// instead of the wrapper pointers.

template <typename ScopedCSSNameWrapperType>
struct ScopedCSSNameWrapperPtrHashTraits
    : MemberHashTraits<ScopedCSSNameWrapperType> { … };

template <>
struct HashTraits<blink::Member<blink::ScopedCSSName>>
    : ScopedCSSNameWrapperPtrHashTraits<blink::ScopedCSSName> { … };
template <>
struct HashTraits<blink::Member<const blink::ScopedCSSName>>
    : ScopedCSSNameWrapperPtrHashTraits<const blink::ScopedCSSName> { … };

}  // namespace WTF

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_STYLE_SCOPED_CSS_NAME_H_