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comparison: content/base/src/nsAttrAndChildArray.h

content/base/src/nsAttrAndChildArray.h

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TOR_BUG_9701
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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 /*
7 * Storage of the children and attributes of a DOM node; storage for
8 * the two is unified to minimize footprint.
9 */
10
11 #ifndef nsAttrAndChildArray_h___
12 #define nsAttrAndChildArray_h___
13
14 #include "mozilla/Attributes.h"
15 #include "mozilla/MemoryReporting.h"
16
17 #include "nscore.h"
18 #include "nsAttrName.h"
19 #include "nsAttrValue.h"
20 #include "nsCaseTreatment.h"
21
22 class nsINode;
23 class nsIContent;
24 class nsMappedAttributes;
25 class nsHTMLStyleSheet;
26 class nsRuleWalker;
27 class nsMappedAttributeElement;
28
29 #define ATTRCHILD_ARRAY_GROWSIZE 8
30 #define ATTRCHILD_ARRAY_LINEAR_THRESHOLD 32
31
32 #define ATTRCHILD_ARRAY_ATTR_SLOTS_BITS 10
33
34 #define ATTRCHILD_ARRAY_MAX_ATTR_COUNT \
35 ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
36
37 #define ATTRCHILD_ARRAY_MAX_CHILD_COUNT \
38 (~uint32_t(0) >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS)
39
40 #define ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK \
41 ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
42
43
44 #define ATTRSIZE (sizeof(InternalAttr) / sizeof(void*))
45
46 class nsAttrAndChildArray
47 {
48 public:
49 nsAttrAndChildArray();
50 ~nsAttrAndChildArray();
51
52 uint32_t ChildCount() const
53 {
54 return mImpl ? (mImpl->mAttrAndChildCount >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) : 0;
55 }
56 nsIContent* ChildAt(uint32_t aPos) const
57 {
58 NS_ASSERTION(aPos < ChildCount(), "out-of-bounds access in nsAttrAndChildArray");
59 return reinterpret_cast<nsIContent*>(mImpl->mBuffer[AttrSlotsSize() + aPos]);
60 }
61 nsIContent* GetSafeChildAt(uint32_t aPos) const;
62 nsIContent * const * GetChildArray(uint32_t* aChildCount) const;
63 nsresult AppendChild(nsIContent* aChild)
64 {
65 return InsertChildAt(aChild, ChildCount());
66 }
67 nsresult InsertChildAt(nsIContent* aChild, uint32_t aPos);
68 void RemoveChildAt(uint32_t aPos);
69 // Like RemoveChildAt but hands the reference to the child being
70 // removed back to the caller instead of just releasing it.
71 already_AddRefed<nsIContent> TakeChildAt(uint32_t aPos);
72 int32_t IndexOfChild(const nsINode* aPossibleChild) const;
73
74 bool HasAttrs() const
75 {
76 return MappedAttrCount() || (AttrSlotCount() && AttrSlotIsTaken(0));
77 }
78
79 uint32_t AttrCount() const;
80 const nsAttrValue* GetAttr(nsIAtom* aLocalName,
81 int32_t aNamespaceID = kNameSpaceID_None) const;
82 // As above but using a string attr name and always using
83 // kNameSpaceID_None. This is always case-sensitive.
84 const nsAttrValue* GetAttr(const nsAString& aName) const;
85 // Get an nsAttrValue by qualified name. Can optionally do
86 // ASCII-case-insensitive name matching.
87 const nsAttrValue* GetAttr(const nsAString& aName,
88 nsCaseTreatment aCaseSensitive) const;
89 const nsAttrValue* AttrAt(uint32_t aPos) const;
90 nsresult SetAndTakeAttr(nsIAtom* aLocalName, nsAttrValue& aValue);
91 nsresult SetAndTakeAttr(nsINodeInfo* aName, nsAttrValue& aValue);
92
93 // Remove the attr at position aPos. The value of the attr is placed in
94 // aValue; any value that was already in aValue is destroyed.
95 nsresult RemoveAttrAt(uint32_t aPos, nsAttrValue& aValue);
96
97 // Returns attribute name at given position, *not* out-of-bounds safe
98 const nsAttrName* AttrNameAt(uint32_t aPos) const;
99
100 // Returns attribute name at given position or null if aPos is out-of-bounds
101 const nsAttrName* GetSafeAttrNameAt(uint32_t aPos) const;
102
103 const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const;
104 int32_t IndexOfAttr(nsIAtom* aLocalName, int32_t aNamespaceID = kNameSpaceID_None) const;
105
106 nsresult SetAndTakeMappedAttr(nsIAtom* aLocalName, nsAttrValue& aValue,
107 nsMappedAttributeElement* aContent,
108 nsHTMLStyleSheet* aSheet);
109 nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet) {
110 if (!mImpl || !mImpl->mMappedAttrs) {
111 return NS_OK;
112 }
113 return DoSetMappedAttrStyleSheet(aSheet);
114 }
115 void WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker);
116
117 void Compact();
118
119 bool CanFitMoreAttrs() const
120 {
121 return AttrSlotCount() < ATTRCHILD_ARRAY_MAX_ATTR_COUNT ||
122 !AttrSlotIsTaken(ATTRCHILD_ARRAY_MAX_ATTR_COUNT - 1);
123 }
124
125 size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
126 bool HasMappedAttrs() const
127 {
128 return MappedAttrCount();
129 }
130
131 private:
132 nsAttrAndChildArray(const nsAttrAndChildArray& aOther) MOZ_DELETE;
133 nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther) MOZ_DELETE;
134
135 void Clear();
136
137 uint32_t NonMappedAttrCount() const;
138 uint32_t MappedAttrCount() const;
139
140 // Returns a non-null zero-refcount object.
141 nsMappedAttributes*
142 GetModifiableMapped(nsMappedAttributeElement* aContent,
143 nsHTMLStyleSheet* aSheet,
144 bool aWillAddAttr);
145 nsresult MakeMappedUnique(nsMappedAttributes* aAttributes);
146
147 uint32_t AttrSlotsSize() const
148 {
149 return AttrSlotCount() * ATTRSIZE;
150 }
151
152 uint32_t AttrSlotCount() const
153 {
154 return mImpl ? mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK : 0;
155 }
156
157 bool AttrSlotIsTaken(uint32_t aSlot) const
158 {
159 NS_PRECONDITION(aSlot < AttrSlotCount(), "out-of-bounds");
160 return mImpl->mBuffer[aSlot * ATTRSIZE];
161 }
162
163 void SetChildCount(uint32_t aCount)
164 {
165 mImpl->mAttrAndChildCount =
166 (mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
167 (aCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
168 }
169
170 void SetAttrSlotCount(uint32_t aCount)
171 {
172 mImpl->mAttrAndChildCount =
173 (mImpl->mAttrAndChildCount & ~ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
174 aCount;
175 }
176
177 void SetAttrSlotAndChildCount(uint32_t aSlotCount, uint32_t aChildCount)
178 {
179 mImpl->mAttrAndChildCount = aSlotCount |
180 (aChildCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
181 }
182
183 bool GrowBy(uint32_t aGrowSize);
184 bool AddAttrSlot();
185
186 /**
187 * Set *aPos to aChild and update sibling pointers as needed. aIndex is the
188 * index at which aChild is actually being inserted. aChildCount is the
189 * number of kids we had before the insertion.
190 */
191 inline void SetChildAtPos(void** aPos, nsIContent* aChild, uint32_t aIndex,
192 uint32_t aChildCount);
193
194 /**
195 * Guts of SetMappedAttrStyleSheet for the rare case when we have mapped attrs
196 */
197 nsresult DoSetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet);
198
199 struct InternalAttr
200 {
201 nsAttrName mName;
202 nsAttrValue mValue;
203 };
204
205 struct Impl {
206 uint32_t mAttrAndChildCount;
207 uint32_t mBufferSize;
208 nsMappedAttributes* mMappedAttrs;
209 void* mBuffer[1];
210 };
211
212 Impl* mImpl;
213 };
214
215 #endif

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