Shinichiro Hamaji | 1d545aa | 2015-06-23 15:29:13 +0900 | [diff] [blame] | 1 | // Copyright 2015 Google Inc. All rights reserved |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 15 | #ifndef VAR_H_ |
| 16 | #define VAR_H_ |
| 17 | |
| 18 | #include <memory> |
| 19 | #include <string> |
| 20 | #include <unordered_map> |
| 21 | |
Shinichiro Hamaji | ffc52c3 | 2015-06-23 16:51:07 +0900 | [diff] [blame^] | 22 | #include "ast.h" |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 23 | #include "string_piece.h" |
| 24 | #include "value.h" |
| 25 | |
| 26 | using namespace std; |
| 27 | |
| 28 | class Evaluator; |
| 29 | class Value; |
| 30 | |
| 31 | class Var : public Evaluable { |
| 32 | public: |
| 33 | virtual ~Var(); |
| 34 | |
| 35 | virtual const char* Flavor() const = 0; |
| 36 | virtual const char* Origin() const = 0; |
| 37 | virtual bool IsDefined() const { return true; } |
| 38 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 39 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 40 | |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 41 | virtual StringPiece String() const = 0; |
| 42 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 43 | virtual string DebugString() const = 0; |
| 44 | |
| 45 | protected: |
| 46 | Var(); |
| 47 | }; |
| 48 | |
| 49 | class SimpleVar : public Var { |
| 50 | public: |
| 51 | SimpleVar(shared_ptr<string> v, const char* origin); |
| 52 | |
| 53 | virtual const char* Flavor() const { |
| 54 | return "simple"; |
| 55 | } |
| 56 | virtual const char* Origin() const { |
| 57 | return origin_; |
| 58 | } |
| 59 | |
| 60 | virtual shared_ptr<string> Eval(Evaluator*) const override { |
| 61 | return v_; |
| 62 | } |
| 63 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 64 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 65 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 66 | |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 67 | virtual StringPiece String() const override; |
| 68 | |
Shinichiro Hamaji | cf0cd68 | 2015-06-18 16:18:13 +0900 | [diff] [blame] | 69 | virtual string DebugString() const override; |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 70 | |
| 71 | private: |
| 72 | shared_ptr<string> v_; |
| 73 | const char* origin_; |
| 74 | }; |
| 75 | |
| 76 | class RecursiveVar : public Var { |
| 77 | public: |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 78 | RecursiveVar(Value* v, const char* origin, StringPiece orig); |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 79 | |
| 80 | virtual const char* Flavor() const { |
| 81 | return "recursive"; |
| 82 | } |
| 83 | virtual const char* Origin() const { |
| 84 | return origin_; |
| 85 | } |
| 86 | |
| 87 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 88 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 89 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 90 | |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 91 | virtual StringPiece String() const override; |
| 92 | |
Shinichiro Hamaji | cf0cd68 | 2015-06-18 16:18:13 +0900 | [diff] [blame] | 93 | virtual string DebugString() const override; |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 94 | |
| 95 | private: |
| 96 | Value* v_; |
| 97 | const char* origin_; |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 98 | StringPiece orig_; |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | class UndefinedVar : public Var { |
| 102 | public: |
| 103 | UndefinedVar(); |
| 104 | |
| 105 | virtual const char* Flavor() const { |
| 106 | return "undefined"; |
| 107 | } |
| 108 | virtual const char* Origin() const { |
| 109 | return "undefined"; |
| 110 | } |
| 111 | virtual bool IsDefined() const { return false; } |
| 112 | |
| 113 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 114 | |
Shinichiro Hamaji | 81699be | 2015-06-22 18:07:38 +0900 | [diff] [blame] | 115 | virtual StringPiece String() const override; |
| 116 | |
Shinichiro Hamaji | cf0cd68 | 2015-06-18 16:18:13 +0900 | [diff] [blame] | 117 | virtual string DebugString() const override; |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 118 | }; |
| 119 | |
| 120 | extern UndefinedVar* kUndefined; |
| 121 | |
Shinichiro Hamaji | ffc52c3 | 2015-06-23 16:51:07 +0900 | [diff] [blame^] | 122 | class RuleVar : public Var { |
| 123 | public: |
| 124 | RuleVar(Var* v, AssignOp op) |
| 125 | : v_(v), op_(op) {} |
| 126 | virtual ~RuleVar() { |
| 127 | delete v_; |
| 128 | } |
| 129 | |
| 130 | virtual const char* Flavor() const { |
| 131 | return v_->Flavor(); |
| 132 | } |
| 133 | virtual const char* Origin() const { |
| 134 | return v_->Origin(); |
| 135 | } |
| 136 | virtual bool IsDefined() const { |
| 137 | return v_->IsDefined(); |
| 138 | } |
| 139 | virtual void Eval(Evaluator* ev, string* s) const { |
| 140 | v_->Eval(ev, s); |
| 141 | } |
| 142 | virtual void AppendVar(Evaluator* ev, Value* v) { |
| 143 | v_->AppendVar(ev, v); |
| 144 | } |
| 145 | virtual StringPiece String() const override { |
| 146 | return v_->String(); |
| 147 | } |
| 148 | virtual string DebugString() const override { |
| 149 | return v_->DebugString(); |
| 150 | } |
| 151 | |
| 152 | Var* v() const { return v_; } |
| 153 | AssignOp op() const { return op_; } |
| 154 | |
| 155 | private: |
| 156 | Var* v_; |
| 157 | AssignOp op_; |
| 158 | }; |
| 159 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 160 | class Vars : public unordered_map<StringPiece, Var*> { |
| 161 | public: |
| 162 | ~Vars(); |
| 163 | |
| 164 | Var* Lookup(StringPiece name) const; |
| 165 | |
| 166 | void Assign(StringPiece name, Var* v); |
| 167 | }; |
| 168 | |
Shinichiro Hamaji | cf0cd68 | 2015-06-18 16:18:13 +0900 | [diff] [blame] | 169 | class ScopedVar { |
| 170 | public: |
| 171 | // Does not take ownerships of arguments. |
| 172 | ScopedVar(Vars* vars, StringPiece name, Var* var); |
| 173 | ~ScopedVar(); |
| 174 | |
| 175 | private: |
| 176 | Vars* vars_; |
| 177 | Var* orig_; |
| 178 | Vars::iterator iter_; |
| 179 | }; |
| 180 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 181 | #endif // VAR_H_ |