1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_ServoElementSnapshot_h
#define mozilla_ServoElementSnapshot_h
#include "mozilla/EventStates.h"
#include "mozilla/TypedEnumBits.h"
#include "mozilla/dom/BorrowedAttrInfo.h"
#include "nsAttrName.h"
#include "nsAttrValue.h"
#include "nsChangeHint.h"
#include "nsIAtom.h"
namespace mozilla {
namespace dom {
class Element;
} // namespace dom
/**
* A structure representing a single attribute name and value.
*
* This is pretty similar to the private nsAttrAndChildArray::InternalAttr.
*/
struct ServoAttrSnapshot
{
nsAttrName mName;
nsAttrValue mValue;
ServoAttrSnapshot(const nsAttrName& aName, const nsAttrValue& aValue)
: mName(aName)
, mValue(aValue)
{
}
};
/**
* A bitflags enum class used to determine what data does a ServoElementSnapshot
* contains.
*/
enum class ServoElementSnapshotFlags : uint8_t
{
State = 1 << 0,
Attributes = 1 << 1,
All = State | Attributes
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ServoElementSnapshotFlags)
/**
* This class holds all non-tree-structural state of an element that might be
* used for selector matching eventually.
*
* This means the attributes, and the element state, such as :hover, :active,
* etc...
*/
class ServoElementSnapshot
{
typedef dom::BorrowedAttrInfo BorrowedAttrInfo;
typedef dom::Element Element;
typedef EventStates::ServoType ServoStateType;
public:
typedef ServoElementSnapshotFlags Flags;
explicit ServoElementSnapshot(Element* aElement);
bool HasAttrs() { return HasAny(Flags::Attributes); }
bool HasState() { return HasAny(Flags::State); }
/**
* Captures the given state (if not previously captured).
*/
void AddState(EventStates aState)
{
if (!HasAny(Flags::State)) {
mState = aState.ServoValue();
mContains |= Flags::State;
}
}
/**
* Captures the given element attributes (if not previously captured).
*/
void AddAttrs(Element* aElement);
void AddExplicitChangeHint(nsChangeHint aMinChangeHint)
{
mExplicitChangeHint |= aMinChangeHint;
}
void AddExplicitRestyleHint(nsRestyleHint aRestyleHint)
{
mExplicitRestyleHint |= aRestyleHint;
}
nsRestyleHint ExplicitRestyleHint() { return mExplicitRestyleHint; }
nsChangeHint ExplicitChangeHint() { return mExplicitChangeHint; }
/**
* Needed methods for attribute matching.
*/
BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const
{
if (aIndex >= mAttrs.Length()) {
return BorrowedAttrInfo(nullptr, nullptr);
}
return BorrowedAttrInfo(&mAttrs[aIndex].mName, &mAttrs[aIndex].mValue);
}
const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName) const
{
return GetParsedAttr(aLocalName, kNameSpaceID_None);
}
const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName,
int32_t aNamespaceID) const
{
uint32_t i, len = mAttrs.Length();
if (aNamespaceID == kNameSpaceID_None) {
// This should be the common case so lets make an optimized loop
for (i = 0; i < len; ++i) {
if (mAttrs[i].mName.Equals(aLocalName)) {
return &mAttrs[i].mValue;
}
}
return nullptr;
}
for (i = 0; i < len; ++i) {
if (mAttrs[i].mName.Equals(aLocalName, aNamespaceID)) {
return &mAttrs[i].mValue;
}
}
return nullptr;
}
bool IsInChromeDocument() const
{
return mIsInChromeDocument;
}
bool HasAny(Flags aFlags) { return bool(mContains & aFlags); }
private:
// TODO: Profile, a 1 or 2 element AutoTArray could be worth it, given we know
// we're dealing with attribute changes when we take snapshots of attributes,
// though it can be wasted space if we deal with a lot of state-only
// snapshots.
Flags mContains;
nsTArray<ServoAttrSnapshot> mAttrs;
ServoStateType mState;
nsRestyleHint mExplicitRestyleHint;
nsChangeHint mExplicitChangeHint;
bool mIsHTMLElementInHTMLDocument;
bool mIsInChromeDocument;
};
} // namespace mozilla
#endif
|
