comparison: src/Expression.h
src/Expression.h
- changeset 91
- 427eb377d53e
- child 92
- 3a00d396bce2
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| 90:90ab2f2b3dc0 | 91:427eb377d53e |
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| 1 #ifndef BOTC_EXPRESSION_H | |
| 2 #define BOTC_EXPRESSION_H | |
| 3 #include "Parser.h" | |
| 4 | |
| 5 class DataBuffer; | |
| 6 class ExpressionSymbol; | |
| 7 class ExpressionValue; | |
| 8 | |
| 9 // ============================================================================= | |
| 10 // | |
| 11 class Expression final | |
| 12 { | |
| 13 public: | |
| 14 Expression (BotscriptParser* parser, EType reqtype, Lexer* lx); | |
| 15 ~Expression(); | |
| 16 ExpressionValue* GetResult(); | |
| 17 | |
| 18 private: | |
| 19 Lexer* mLexer; | |
| 20 List<ExpressionSymbol*> mSymbols; | |
| 21 EType mType; | |
| 22 ExpressionValue* mResult; | |
| 23 BotscriptParser* mParser; | |
| 24 | |
| 25 ExpressionValue* Evaluate(); // Process the expression and yield a result | |
| 26 ExpressionSymbol* ParseSymbol(); | |
| 27 String GetTokenString(); | |
| 28 void Verify(); // Ensure the expr is valid | |
| 29 }; | |
| 30 | |
| 31 // ============================================================================= | |
| 32 // | |
| 33 class ExpressionSymbol | |
| 34 { | |
| 35 public: | |
| 36 enum EExpressionSymbolType | |
| 37 { | |
| 38 eOperator, | |
| 39 eOperand, | |
| 40 eColon, | |
| 41 }; | |
| 42 | |
| 43 PROPERTY (private, EExpressionSymbolType, Type, NO_OPS, STOCK_WRITE) | |
| 44 }; | |
| 45 | |
| 46 // ============================================================================= | |
| 47 // | |
| 48 class ExpressionOperator final : public ExpressionSymbol | |
| 49 { | |
| 50 PROPERTY (public, int, ID, NO_OPS, STOCK_WRITE) | |
| 51 | |
| 52 public: | |
| 53 ExpressionOperator (int id); | |
| 54 }; | |
| 55 | |
| 56 // ============================================================================= | |
| 57 // | |
| 58 class ExpressionValue final : public ExpressionSymbol | |
| 59 { | |
| 60 PROPERTY (public, int, Value, BOOL_OPS, STOCK_WRITE) | |
| 61 PROPERTY (public, DataBuffer*, Buffer, NO_OPS, STOCK_WRITE) | |
| 62 PROPERTY (public, EType, ValueType, NO_OPS, STOCK_WRITE) | |
| 63 | |
| 64 public: | |
| 65 ExpressionValue (EType valuetype); | |
| 66 | |
| 67 void ConvertToBuffer(); | |
| 68 | |
| 69 inline bool IsConstexpr() const | |
| 70 { | |
| 71 return GetBuffer() == null; | |
| 72 } | |
| 73 }; | |
| 74 | |
| 75 // ============================================================================= | |
| 76 // | |
| 77 // This class represents a ":" in the expression. It serves as the colon for the | |
| 78 // ternary ?: operator. It's not an operand nor is an operator, nor can we just | |
| 79 // skip it so it is its own thing here. | |
| 80 // | |
| 81 class ExpressionColon final : public ExpressionSymbol | |
| 82 { | |
| 83 public: | |
| 84 ExpressionColon() : | |
| 85 mType (eColon) {} | |
| 86 }; | |
| 87 | |
| 88 #endif // BOTC_EXPRESSION_H |
