Yifan Hong | 5216569 | 2016-08-12 18:06:40 -0700 | [diff] [blame^] | 1 | #ifndef CONSTANT_EXPRESSION_H_ |
| 2 | |
| 3 | #define CONSTANT_EXPRESSION_H_ |
| 4 | |
| 5 | #include <android-base/macros.h> |
| 6 | #include <string> |
| 7 | |
| 8 | namespace android { |
| 9 | |
| 10 | |
| 11 | /** |
| 12 | * A constant expression is represented by a tree. |
| 13 | */ |
| 14 | struct ConstantExpression { |
| 15 | /* Literals, identifiers */ |
| 16 | ConstantExpression(const char *value); |
| 17 | /* binary operations */ |
| 18 | ConstantExpression(const ConstantExpression *value1, |
| 19 | const char *op, const ConstantExpression* value2); |
| 20 | /* unary operations */ |
| 21 | ConstantExpression(const char *op, const ConstantExpression *value); |
| 22 | /* ternary ?: */ |
| 23 | ConstantExpression(const ConstantExpression *cond, |
| 24 | const ConstantExpression *trueVal, |
| 25 | const ConstantExpression *falseVal); |
| 26 | |
| 27 | /* Original expression. */ |
| 28 | const char *c_str() const; |
| 29 | /* Evaluated result. */ |
| 30 | const char *value() const; |
| 31 | |
| 32 | private: |
| 33 | std::string mValue; |
| 34 | |
| 35 | DISALLOW_COPY_AND_ASSIGN(ConstantExpression); |
| 36 | }; |
| 37 | |
| 38 | } // namespace android |
| 39 | |
| 40 | #endif // CONSTANT_EXPRESSION_H_ |