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Documentation                       Search   eval_num_expr.h Go to the documentation of this file. /* Copyright, 2000, 2001 Nevrax Ltd. * * This file is part of NEVRAX NeL Network Services. * NEVRAX NeL Network Services is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * NEVRAX NeL Network Services is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * You should have received a copy of the GNU General Public License * along with NEVRAX NeL Network Services; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ #ifndef NL_EVAL_NUM_EXPR_H #define NL_EVAL_NUM_EXPR_H #include "nel/misc/types_nl.h" namespace NLMISC { class CEvalNumExpr { public: virtual ~CEvalNumExpr() {} enum TReturnState { NoError, // No error UnkownValue, // Unkown value has been parsed ValueError, // Error during user defined value evaluation UnkownFunction, // Unkown function has been parsed FunctionError, // Error during user defined function evaluation NumberSyntaxError, // Syntax error in a number expression UnkownOperator, // Unkown operator MustBeOpen, // Should be a open parentesis MustBeClose, // Should be a close parentesis MustBeComa, // Should be a coma character MustBeExpression, // Should be an expression NotUnaryOperator, // Should not be an unary operator MustBeEnd, // Should be the end MustBeDoubleQuote, // Should be a double quote ReturnValueCount }; TReturnState evalExpression (const char *expression, double &result, int *errorIndex, uint32 userData = 0); const char* getErrorString (TReturnState state) const; protected: virtual TReturnState evalValue (const char *value, double &result, uint32 userData); virtual TReturnState evalFunction (const char *funcName, double arg0, double &result); virtual TReturnState evalFunction (const char *funcName, double arg0, double arg1, double &result); private: enum TToken { Number, // This is a number Function1, // This is a function with one argu Function2, // This is a function with two argu String, // This is a user string Operator, // This is an operator Open, // ( Close, // ) Coma, // , End, // End of string }; // Operators enum TOperator { Not = 0, // ! Tilde, // ~ Mul, // * Div, // / Remainder, // % Plus, // + Minus, // - ULeftShift, // << URightShift, // >> SLeftShift, // <- SRightShift, // -> Inferior, // < InferiorEqual, // <= Superior, // > SuperiorEqual, // >= Equal, // == NotEqual, // != And, // & Or, // | Xor, // ^ LogicalAnd, // && LogicalOr, // || LogicalXor, // ^^ OperatorCount, // NotOperator, // This is not an operator ExtOperator, // This is a 2 charcters operator }; // Functions enum TReservedWord { Abs = 0, Acos, Asin, Atan, Atan2, Ceil, Cos, Cosh, Exp, Exponent, Floor, Int, Log, Log10, Mantissa, Max, Min, Pow, Rand, Round, Sin, Sinh, Sq, Sqrt, Tan, Tanh, ReservedWordCount, }; // Some constant enum { InternalStringLen = 32, InternalOperator = 4, }; TReturnState _State; // Current state const char *_ExprPtr; // Current pointer on the expression TReturnState readDecimal (double &value); void readIntegerNumberDecimal (double &value); TReturnState getNextToken (TToken &token); TReturnState evalExpression (double &result, TToken &nextToken, uint32 userData); TReservedWord _ReservedWordFound; char _InternalString[InternalStringLen]; std::string _InternalStlString; const char *_InternalStringPtr; double _Value; TOperator _Op; static const TToken _ReservedWordToken[ReservedWordCount]; static const char *_ReservedWord[ReservedWordCount]; static const TOperator _OperatorArray[128]; static const bool _StringChar[128]; static const char *_ErrorString[ReturnValueCount]; static const int _OperatorPrecedence[]; public: bool internalCheck (); }; } #endif // NL_EVAL_NUM_EXPR_H