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1 /*
2  * Copyright (C) 2011 Google 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  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #ifndef TreeScope_h
27 #define TreeScope_h
28 
29 #include "ContainerNode.h"
30 #include "DocumentOrderedMap.h"
31 
32 namespace WebCore {
33 
34 class Element;
35 class HTMLMapElement;
36 
37 class TreeScope : public ContainerNode {
38     friend class Document;
39 
40 public:
parentTreeScope()41     TreeScope* parentTreeScope() const { return m_parentTreeScope; }
42 
43     Element* getElementById(const AtomicString&) const;
44     bool hasElementWithId(AtomicStringImpl* id) const;
45     bool containsMultipleElementsWithId(const AtomicString& id) const;
46     void addElementById(const AtomicString& elementId, Element*);
47     void removeElementById(const AtomicString& elementId, Element*);
48 
49     void addImageMap(HTMLMapElement*);
50     void removeImageMap(HTMLMapElement*);
51     HTMLMapElement* getImageMap(const String& url) const;
52 
53     Element* getElementByAccessKey(const String& key) const;
54     void invalidateAccessKeyMap();
55 
addNodeListCache()56     void addNodeListCache() { ++m_numNodeListCaches; }
removeNodeListCache()57     void removeNodeListCache() { ASSERT(m_numNodeListCaches > 0); --m_numNodeListCaches; }
hasNodeListCaches()58     bool hasNodeListCaches() const { return m_numNodeListCaches; }
59 
60     // Find first anchor with the given name.
61     // First searches for an element with the given ID, but if that fails, then looks
62     // for an anchor with the given name. ID matching is always case sensitive, but
63     // Anchor name matching is case sensitive in strict mode and not case sensitive in
64     // quirks mode for historical compatibility reasons.
65     Element* findAnchor(const String& name);
66 
67 protected:
68     TreeScope(Document*, ConstructionType = CreateContainer);
69 
70     virtual ~TreeScope();
71 
72     void destroyTreeScopeData();
73 
74     void setParentTreeScope(TreeScope*);
75 
76 private:
77     TreeScope* m_parentTreeScope;
78 
79     DocumentOrderedMap m_elementsById;
80     DocumentOrderedMap m_imageMapsByName;
81 
82     mutable HashMap<StringImpl*, Element*, CaseFoldingHash> m_elementsByAccessKey;
83     mutable bool m_accessKeyMapValid;
84 
85     unsigned m_numNodeListCaches;
86 };
87 
hasElementWithId(AtomicStringImpl * id)88 inline bool TreeScope::hasElementWithId(AtomicStringImpl* id) const
89 {
90     ASSERT(id);
91     return m_elementsById.contains(id);
92 }
93 
containsMultipleElementsWithId(const AtomicString & id)94 inline bool TreeScope::containsMultipleElementsWithId(const AtomicString& id) const
95 {
96     return m_elementsById.containsMultiple(id.impl());
97 }
98 
99 } // namespace WebCore
100 
101 #endif // TreeScope_h
102 
103