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
|
/*
* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006, 2009 Apple Inc.
*
* 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 THE AUTHOR ``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 THE AUTHOR 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_XML_XPATH_STEP_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_XML_XPATH_STEP_H_
#include "third_party/blink/renderer/core/xml/xpath_expression_node.h"
#include "third_party/blink/renderer/core/xml/xpath_node_set.h"
namespace blink {
class Node;
namespace xpath {
class Predicate;
class Step final : public ParseNode {
public:
enum Axis {
kAncestorAxis,
kAncestorOrSelfAxis,
kAttributeAxis,
kChildAxis,
kDescendantAxis,
kDescendantOrSelfAxis,
kFollowingAxis,
kFollowingSiblingAxis,
kNamespaceAxis,
kParentAxis,
kPrecedingAxis,
kPrecedingSiblingAxis,
kSelfAxis
};
class NodeTest final : public GarbageCollected<NodeTest> {
public:
enum Kind {
kTextNodeTest,
kCommentNodeTest,
kProcessingInstructionNodeTest,
kAnyNodeTest,
kNameTest
};
NodeTest(Kind kind) : kind_(kind) {}
NodeTest(Kind kind, const String& data) : kind_(kind), data_(data) {}
NodeTest(Kind kind,
const AtomicString& data,
const AtomicString& namespace_uri)
: kind_(kind), data_(data), namespace_uri_(namespace_uri) {}
NodeTest(const NodeTest& o)
: kind_(o.kind_), data_(o.data_), namespace_uri_(o.namespace_uri_) {
DCHECK(o.merged_predicates_.empty());
}
NodeTest& operator=(const NodeTest& o) {
kind_ = o.kind_;
data_ = o.data_;
namespace_uri_ = o.namespace_uri_;
DCHECK(o.merged_predicates_.empty());
return *this;
}
void Trace(Visitor* visitor) const { visitor->Trace(merged_predicates_); }
Kind GetKind() const { return kind_; }
const AtomicString& Data() const { return data_; }
const AtomicString& NamespaceURI() const { return namespace_uri_; }
HeapVector<Member<Predicate>>& MergedPredicates() {
return merged_predicates_;
}
const HeapVector<Member<Predicate>>& MergedPredicates() const {
return merged_predicates_;
}
private:
Kind kind_;
AtomicString data_;
AtomicString namespace_uri_;
// When possible, we merge some or all predicates with node test for better
// performance.
HeapVector<Member<Predicate>> merged_predicates_;
};
Step(Axis, const NodeTest&);
Step(Axis, const NodeTest&, GCedHeapVector<Member<Predicate>>&);
Step(const Step&) = delete;
Step& operator=(const Step&) = delete;
~Step() override;
void Trace(Visitor*) const override;
void Optimize();
void Evaluate(EvaluationContext&, Node* context, NodeSet&) const;
Axis GetAxis() const { return axis_; }
const NodeTest& GetNodeTest() const { return *node_test_; }
private:
friend bool OptimizeStepPair(Step*, Step*);
bool PredicatesAreContextListInsensitive() const;
NodeTest& GetNodeTest() { return *node_test_; }
void ParseNodeTest(const String&);
void NodesInAxis(EvaluationContext&, Node* context, NodeSet&) const;
String NamespaceFromNodetest(const String& node_test) const;
Axis axis_;
Member<NodeTest> node_test_;
HeapVector<Member<Predicate>> predicates_;
};
bool OptimizeStepPair(Step*, Step*);
} // namespace xpath
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_XML_XPATH_STEP_H_
|
