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/*
* Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2014 Samsung Electronics. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_SELECTOR_QUERY_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_SELECTOR_QUERY_H_
#include <memory>
#include "third_party/blink/renderer/core/css/css_selector_list.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class CSSSelector;
class ContainerNode;
class Document;
class Element;
class ExceptionState;
template <typename NodeType>
class StaticNodeTypeList;
using StaticElementList = StaticNodeTypeList<Element>;
class CORE_EXPORT SelectorQuery {
USING_FAST_MALLOC(SelectorQuery);
public:
SelectorQuery(const SelectorQuery&) = delete;
SelectorQuery& operator=(const SelectorQuery&) = delete;
static std::unique_ptr<SelectorQuery> Adopt(CSSSelectorList);
// https://dom.spec.whatwg.org/#dom-element-matches
bool Matches(Element&) const;
// https://dom.spec.whatwg.org/#dom-element-closest
Element* Closest(Element&) const;
// https://dom.spec.whatwg.org/#dom-parentnode-queryselectorall
StaticElementList* QueryAll(ContainerNode& root_node) const;
// https://dom.spec.whatwg.org/#dom-parentnode-queryselector
Element* QueryFirst(ContainerNode& root_node) const;
struct QueryStats {
unsigned total_count;
unsigned fast_id;
unsigned fast_class;
unsigned fast_tag_name;
unsigned fast_scan;
unsigned slow_scan;
unsigned slow_traversing_shadow_tree_scan;
};
// Used by unit tests to get information about what paths were taken during
// the last query. Always reset between queries. This system is disabled in
// non DCHECK builds to avoid the overhead on the query process.
static QueryStats LastQueryStats();
private:
explicit SelectorQuery(CSSSelectorList);
template <typename SelectorQueryTrait>
void ExecuteWithId(ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
template <typename SelectorQueryTrait>
void FindTraverseRootsAndExecute(
ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
template <typename SelectorQueryTrait>
void ExecuteForTraverseRoot(ContainerNode& traverse_root,
ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
template <typename SelectorQueryTrait>
void ExecuteSlow(ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
template <typename SelectorQueryTrait>
void ExecuteSlowTraversingShadowTree(
ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
template <typename SelectorQueryTrait>
void Execute(ContainerNode& root_node,
typename SelectorQueryTrait::OutputType&) const;
bool SelectorListMatches(ContainerNode& root_node, Element&) const;
CSSSelectorList selector_list_;
// Contains the list of CSSSelector's to match, but without ones that could
// never match like pseudo elements, div::before. This can be empty, while
// |selector_list_| will never be empty as SelectorQueryCache::add would have
// thrown an exception.
Vector<const CSSSelector*> selectors_;
AtomicString selector_id_;
bool selector_id_is_rightmost_ : 1;
bool selector_id_affected_by_sibling_combinator_ : 1;
bool uses_deep_combinator_or_shadow_pseudo_ : 1;
bool needs_updated_distribution_ : 1;
bool use_slow_scan_ : 1;
};
class SelectorQueryCache {
USING_FAST_MALLOC(SelectorQueryCache);
public:
SelectorQuery* Add(const AtomicString&, const Document&, ExceptionState&);
void Invalidate();
private:
HashMap<AtomicString, std::unique_ptr<SelectorQuery>> entries_;
};
} // namespace blink
#endif
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