1/*
2 * Copyright (C) 2011, 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef SelectorQuery_h
27#define SelectorQuery_h
28
29#include "CSSSelectorList.h"
30#include "NodeList.h"
31#include <wtf/HashMap.h>
32#include <wtf/PassRefPtr.h>
33#include <wtf/Vector.h>
34#include <wtf/text/AtomicStringHash.h>
35
36namespace WebCore {
37
38typedef int ExceptionCode;
39
40class CSSSelector;
41class Document;
42class Element;
43class Node;
44class NodeList;
45
46class SelectorDataList {
47public:
48    void initialize(const CSSSelectorList&);
49    bool matches(Element*) const;
50    PassRefPtr<NodeList> queryAll(Node* rootNode) const;
51    PassRefPtr<Element> queryFirst(Node* rootNode) const;
52
53private:
54    struct SelectorData {
55        SelectorData(const CSSSelector* selector, bool isFastCheckable) : selector(selector), isFastCheckable(isFastCheckable) { }
56        const CSSSelector* selector;
57        bool isFastCheckable;
58    };
59
60    bool selectorMatches(const SelectorData&, Element*, const Node*) const;
61    template <bool firstMatchOnly>
62    void execute(Node* rootNode, Vector<RefPtr<Node> >&) const;
63
64    template <bool firstMatchOnly> void executeFastPathForIdSelector(const Node* rootNode, const SelectorData&, const CSSSelector* idSelector, Vector<RefPtr<Node> >&) const;
65    template <bool firstMatchOnly> void executeSingleTagNameSelectorData(const Node* rootNode, const SelectorData&, Vector<RefPtr<Node> >&) const;
66    template <bool firstMatchOnly> void executeSingleClassNameSelectorData(const Node* rootNode, const SelectorData&, Vector<RefPtr<Node> >&) const;
67    template <bool firstMatchOnly> void executeSingleSelectorData(const Node* rootNode, const SelectorData&, Vector<RefPtr<Node> >&) const;
68    template <bool firstMatchOnly> void executeSingleMultiSelectorData(const Node* rootNode, Vector<RefPtr<Node> >&) const;
69
70    Vector<SelectorData> m_selectors;
71};
72
73class SelectorQuery {
74    WTF_MAKE_NONCOPYABLE(SelectorQuery);
75    WTF_MAKE_FAST_ALLOCATED;
76public:
77    explicit SelectorQuery(const CSSSelectorList&);
78    bool matches(Element*) const;
79    PassRefPtr<NodeList> queryAll(Node* rootNode) const;
80    PassRefPtr<Element> queryFirst(Node* rootNode) const;
81private:
82    SelectorDataList m_selectors;
83    CSSSelectorList m_selectorList;
84};
85
86class SelectorQueryCache {
87    WTF_MAKE_FAST_ALLOCATED;
88public:
89    SelectorQuery* add(const AtomicString&, Document*, ExceptionCode&);
90    void invalidate();
91
92private:
93    HashMap<AtomicString, OwnPtr<SelectorQuery> > m_entries;
94};
95
96inline bool SelectorQuery::matches(Element* element) const
97{
98    return m_selectors.matches(element);
99}
100
101inline PassRefPtr<NodeList> SelectorQuery::queryAll(Node* rootNode) const
102{
103    return m_selectors.queryAll(rootNode);
104}
105
106inline PassRefPtr<Element> SelectorQuery::queryFirst(Node* rootNode) const
107{
108    return m_selectors.queryFirst(rootNode);
109}
110
111}
112
113#endif
114