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
|
// Copyright 2015 Google Inc. All rights reserved
//
// 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 VAR_H_
#define VAR_H_
#include <memory>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include "eval.h"
#include "expr.h"
#include "log.h"
#include "stmt.h"
#include "string_piece.h"
#include "symtab.h"
using namespace std;
class Evaluator;
class Value;
enum struct VarOrigin : char {
UNDEFINED,
DEFAULT,
ENVIRONMENT,
ENVIRONMENT_OVERRIDE,
FILE,
COMMAND_LINE,
OVERRIDE,
AUTOMATIC,
};
const char* GetOriginStr(VarOrigin origin);
class Var : public Evaluable {
public:
virtual ~Var();
virtual const char* Flavor() const = 0;
VarOrigin Origin() { return origin_; }
virtual bool IsDefined() const { return true; }
virtual void AppendVar(Evaluator* ev, Value* v);
virtual StringPiece String() const = 0;
virtual string DebugString() const = 0;
bool ReadOnly() const { return readonly_; }
void SetReadOnly() { readonly_ = true; }
bool Deprecated() const { return deprecated_; }
void SetDeprecated(const StringPiece& msg);
bool Obsolete() const { return obsolete_; }
void SetObsolete(const StringPiece& msg);
const string& DeprecatedMessage() const;
// This variable was used (either written or read from)
void Used(Evaluator* ev, const Symbol& sym) const;
AssignOp op() const { return assign_op_; }
void SetAssignOp(AssignOp op) { assign_op_ = op; }
static Var* Undefined();
protected:
Var();
explicit Var(VarOrigin origin);
private:
const VarOrigin origin_;
AssignOp assign_op_;
bool readonly_ : 1;
bool deprecated_ : 1;
bool obsolete_ : 1;
const char* diagnostic_message_text() const;
static unordered_map<const Var*, string> diagnostic_messages_;
};
class SimpleVar : public Var {
public:
explicit SimpleVar(VarOrigin origin);
SimpleVar(const string& v, VarOrigin origin);
SimpleVar(VarOrigin, Evaluator* ev, Value* v);
virtual const char* Flavor() const override { return "simple"; }
virtual void Eval(Evaluator* ev, string* s) const override;
virtual void AppendVar(Evaluator* ev, Value* v) override;
virtual StringPiece String() const override;
virtual string DebugString() const override;
private:
string v_;
};
class RecursiveVar : public Var {
public:
RecursiveVar(Value* v, VarOrigin origin, StringPiece orig);
virtual const char* Flavor() const override { return "recursive"; }
virtual void Eval(Evaluator* ev, string* s) const override;
virtual void AppendVar(Evaluator* ev, Value* v) override;
virtual StringPiece String() const override;
virtual string DebugString() const override;
private:
Value* v_;
StringPiece orig_;
};
class UndefinedVar : public Var {
public:
UndefinedVar();
virtual const char* Flavor() const override { return "undefined"; }
virtual bool IsDefined() const override { return false; }
virtual void Eval(Evaluator* ev, string* s) const override;
virtual StringPiece String() const override;
virtual string DebugString() const override;
};
class Vars : public unordered_map<Symbol, Var*> {
public:
~Vars();
Var* Lookup(Symbol name) const;
Var* Peek(Symbol name) const;
void Assign(Symbol name, Var* v, bool* readonly);
static void add_used_env_vars(Symbol v);
static const SymbolSet used_env_vars() { return used_env_vars_; }
private:
static SymbolSet used_env_vars_;
};
class ScopedVar {
public:
// Does not take ownerships of arguments.
ScopedVar(Vars* vars, Symbol name, Var* var);
~ScopedVar();
private:
Vars* vars_;
Var* orig_;
Vars::iterator iter_;
};
#endif // VAR_H_
|
