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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// Copyright (C) 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ICING_QUERY_ADVANCED_QUERY_PARSER_ABSTRACT_SYNTAX_TREE_H_
#define ICING_QUERY_ADVANCED_QUERY_PARSER_ABSTRACT_SYNTAX_TREE_H_
#include <memory>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
namespace icing {
namespace lib {
class FunctionNameNode;
class StringNode;
class TextNode;
class MemberNode;
class FunctionNode;
class UnaryOperatorNode;
class NaryOperatorNode;
class AbstractSyntaxTreeVisitor {
public:
virtual ~AbstractSyntaxTreeVisitor() = default;
virtual void VisitFunctionName(const FunctionNameNode* node) = 0;
virtual void VisitString(const StringNode* node) = 0;
virtual void VisitText(const TextNode* node) = 0;
virtual void VisitMember(const MemberNode* node) = 0;
virtual void VisitFunction(const FunctionNode* node) = 0;
virtual void VisitUnaryOperator(const UnaryOperatorNode* node) = 0;
virtual void VisitNaryOperator(const NaryOperatorNode* node) = 0;
};
class Node {
public:
virtual ~Node() = default;
virtual void Accept(AbstractSyntaxTreeVisitor* visitor) const = 0;
};
class TerminalNode : public Node {
public:
explicit TerminalNode(std::string value, std::string_view raw_value,
bool is_prefix)
: value_(std::move(value)),
raw_value_(raw_value),
is_prefix_(is_prefix) {}
const std::string& value() const& { return value_; }
std::string value() && { return std::move(value_); }
bool is_prefix() const { return is_prefix_; }
std::string_view raw_value() const { return raw_value_; }
private:
std::string value_;
std::string_view raw_value_;
bool is_prefix_;
};
class FunctionNameNode : public TerminalNode {
public:
explicit FunctionNameNode(std::string value)
: TerminalNode(std::move(value), /*raw_value=*/"", /*is_prefix=*/false) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitFunctionName(this);
}
};
class StringNode : public TerminalNode {
public:
explicit StringNode(std::string value, std::string_view raw_value,
bool is_prefix = false)
: TerminalNode(std::move(value), raw_value, is_prefix) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitString(this);
}
};
class TextNode : public TerminalNode {
public:
explicit TextNode(std::string value, std::string_view raw_value,
bool is_prefix = false)
: TerminalNode(std::move(value), raw_value, is_prefix) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitText(this);
}
};
class MemberNode : public Node {
public:
explicit MemberNode(std::vector<std::unique_ptr<TextNode>> children,
std::unique_ptr<FunctionNode> function)
: children_(std::move(children)), function_(std::move(function)) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitMember(this);
}
const std::vector<std::unique_ptr<TextNode>>& children() const {
return children_;
}
const FunctionNode* function() const { return function_.get(); }
private:
std::vector<std::unique_ptr<TextNode>> children_;
// This is nullable. When it is not nullptr, this class will represent a
// function call.
std::unique_ptr<FunctionNode> function_;
};
class FunctionNode : public Node {
public:
explicit FunctionNode(std::unique_ptr<FunctionNameNode> function_name)
: FunctionNode(std::move(function_name), {}) {}
explicit FunctionNode(std::unique_ptr<FunctionNameNode> function_name,
std::vector<std::unique_ptr<Node>> args)
: function_name_(std::move(function_name)), args_(std::move(args)) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitFunction(this);
}
const FunctionNameNode* function_name() const { return function_name_.get(); }
const std::vector<std::unique_ptr<Node>>& args() const { return args_; }
private:
std::unique_ptr<FunctionNameNode> function_name_;
std::vector<std::unique_ptr<Node>> args_;
};
class UnaryOperatorNode : public Node {
public:
explicit UnaryOperatorNode(std::string operator_text,
std::unique_ptr<Node> child)
: operator_text_(std::move(operator_text)), child_(std::move(child)) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitUnaryOperator(this);
}
const std::string& operator_text() const { return operator_text_; }
const Node* child() const { return child_.get(); }
private:
std::string operator_text_;
std::unique_ptr<Node> child_;
};
class NaryOperatorNode : public Node {
public:
explicit NaryOperatorNode(std::string operator_text,
std::vector<std::unique_ptr<Node>> children)
: operator_text_(std::move(operator_text)),
children_(std::move(children)) {}
void Accept(AbstractSyntaxTreeVisitor* visitor) const override {
visitor->VisitNaryOperator(this);
}
const std::string& operator_text() const { return operator_text_; }
const std::vector<std::unique_ptr<Node>>& children() const {
return children_;
}
private:
std::string operator_text_;
std::vector<std::unique_ptr<Node>> children_;
};
} // namespace lib
} // namespace icing
#endif // ICING_QUERY_ADVANCED_QUERY_PARSER_ABSTRACT_SYNTAX_TREE_H_
|
