Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 1 | #ifndef VAR_H_ |
| 2 | #define VAR_H_ |
| 3 | |
| 4 | #include <memory> |
| 5 | #include <string> |
| 6 | #include <unordered_map> |
| 7 | |
| 8 | #include "string_piece.h" |
| 9 | #include "value.h" |
| 10 | |
| 11 | using namespace std; |
| 12 | |
| 13 | class Evaluator; |
| 14 | class Value; |
| 15 | |
| 16 | class Var : public Evaluable { |
| 17 | public: |
| 18 | virtual ~Var(); |
| 19 | |
| 20 | virtual const char* Flavor() const = 0; |
| 21 | virtual const char* Origin() const = 0; |
| 22 | virtual bool IsDefined() const { return true; } |
| 23 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 24 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 25 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 26 | virtual string DebugString() const = 0; |
| 27 | |
| 28 | protected: |
| 29 | Var(); |
| 30 | }; |
| 31 | |
| 32 | class SimpleVar : public Var { |
| 33 | public: |
| 34 | SimpleVar(shared_ptr<string> v, const char* origin); |
| 35 | |
| 36 | virtual const char* Flavor() const { |
| 37 | return "simple"; |
| 38 | } |
| 39 | virtual const char* Origin() const { |
| 40 | return origin_; |
| 41 | } |
| 42 | |
| 43 | virtual shared_ptr<string> Eval(Evaluator*) const override { |
| 44 | return v_; |
| 45 | } |
| 46 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 47 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 48 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 49 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 50 | string DebugString() const override; |
| 51 | |
| 52 | private: |
| 53 | shared_ptr<string> v_; |
| 54 | const char* origin_; |
| 55 | }; |
| 56 | |
| 57 | class RecursiveVar : public Var { |
| 58 | public: |
| 59 | RecursiveVar(Value* v, const char* origin); |
| 60 | |
| 61 | virtual const char* Flavor() const { |
| 62 | return "recursive"; |
| 63 | } |
| 64 | virtual const char* Origin() const { |
| 65 | return origin_; |
| 66 | } |
| 67 | |
| 68 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 69 | |
Shinichiro Hamaji | 4c469b3 | 2015-06-15 19:53:36 +0900 | [diff] [blame] | 70 | virtual void AppendVar(Evaluator* ev, Value* v); |
| 71 | |
Shinichiro Hamaji | 776ca30 | 2015-06-06 03:52:48 +0900 | [diff] [blame] | 72 | string DebugString() const override; |
| 73 | |
| 74 | private: |
| 75 | Value* v_; |
| 76 | const char* origin_; |
| 77 | }; |
| 78 | |
| 79 | class UndefinedVar : public Var { |
| 80 | public: |
| 81 | UndefinedVar(); |
| 82 | |
| 83 | virtual const char* Flavor() const { |
| 84 | return "undefined"; |
| 85 | } |
| 86 | virtual const char* Origin() const { |
| 87 | return "undefined"; |
| 88 | } |
| 89 | virtual bool IsDefined() const { return false; } |
| 90 | |
| 91 | virtual void Eval(Evaluator* ev, string* s) const override; |
| 92 | |
| 93 | string DebugString() const override; |
| 94 | }; |
| 95 | |
| 96 | extern UndefinedVar* kUndefined; |
| 97 | |
| 98 | class Vars : public unordered_map<StringPiece, Var*> { |
| 99 | public: |
| 100 | ~Vars(); |
| 101 | |
| 102 | Var* Lookup(StringPiece name) const; |
| 103 | |
| 104 | void Assign(StringPiece name, Var* v); |
| 105 | }; |
| 106 | |
| 107 | #endif // VAR_H_ |