| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // 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_HTML_CUSTOM_CUSTOM_ELEMENT_UPGRADE_SORTER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_CUSTOM_ELEMENT_UPGRADE_SORTER_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| |
| namespace blink { |
| |
| class Element; |
| class Node; |
| |
| // Does a shadow-including tree order sort of a subset of elements. |
| // https://dom.spec.whatwg.org/#concept-shadow-including-tree-order |
| class CORE_EXPORT CustomElementUpgradeSorter { |
| STACK_ALLOCATED(); |
| |
| public: |
| CustomElementUpgradeSorter(); |
| |
| // Record an element of interest. The DOM tree must not be |
| // modified between calls to add and the call to sorted. |
| void Add(Element*); |
| |
| // Adds shadow-including descendents of parent to result in |
| // shadow-including tree order. This operation is destroys the |
| // state of this sorter; after calling sorted, you must not call |
| // add or sorted again with this object. |
| void Sorted(HeapVector<Member<Element>>* result, Node* parent); |
| |
| private: |
| using ChildSet = HeapHashSet<Member<Node>>; |
| using ParentChildMap = HeapHashMap<Member<Node>, Member<ChildSet>>; |
| |
| enum AddResult { kParentAlreadyExistsInMap, kParentAddedToMap }; |
| |
| AddResult AddToParentChildMap(Node* parent, Node* child); |
| void Visit(HeapVector<Member<Element>>* result, |
| ChildSet&, |
| const ChildSet::iterator&); |
| |
| Member<HeapHashSet<Member<Element>>> elements_; |
| |
| // This is the subset of the tree, from root node (usually |
| // document) through elements and shadow roots, to candidates. |
| Member<ParentChildMap> parent_child_map_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CUSTOM_CUSTOM_ELEMENT_UPGRADE_SORTER_H_ |