[2510] | 1 | // This may look like C code, but it is really -*- C++ -*-
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| 2 | // Classe Evaluateur RPN (HP like)
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| 3 | // Mars 2004: Extrait de commander.cc
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| 4 | // LAL-IN2P3/CNRS DAPNIA/CEA
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| 5 |
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| 6 | #ifndef RPNEVALUATOR_H_SEEN
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| 7 | #define RPNEVALUATOR_H_SEEN
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| 8 |
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| 9 | #include "machdefs.h"
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| 10 | #include "pexceptions.h"
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| 11 | #include <string>
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| 12 | #include <vector>
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| 13 | #include <stack>
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| 14 |
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| 15 | namespace SOPHYA {
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| 16 |
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[2598] | 17 | /*!
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| 18 | \ingroup SysTools
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| 19 | \brief Exception class used by RPNExpressionEvaluator
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| 20 | \sa RPNExpressionEvaluator
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| 21 | */
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[2510] | 22 | class RPNExprException : public PException {
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| 23 | public:
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[3586] | 24 | explicit RPNExprException(const char * m) throw() : PException(m) {}
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| 25 | explicit RPNExprException(const string& m) throw() : PException(m) {}
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[2510] | 26 | };
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| 27 |
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| 28 |
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| 29 | //! Class for evaluation of arithmetic expressions in RPN (Reverse Polish Notation)
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| 30 | class RPNExpressionEvaluator {
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| 31 | public:
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| 32 | explicit RPNExpressionEvaluator(string const & sex);
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| 33 | explicit RPNExpressionEvaluator(vector<string> & exe, int off=0);
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| 34 | virtual ~RPNExpressionEvaluator();
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[2598] | 35 | //! Return the stack top \c (x) as the result of the expression evaluation
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[2510] | 36 | virtual double Evaluate() const; // Return the value of the stack top
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[2598] | 37 | //! Alias for Evaluate()
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[2510] | 38 | inline double Value() const { return Evaluate(); }
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| 39 |
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[2598] | 40 | private:
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[2510] | 41 | int EvalRPNExpr(vector<string> & args, int off=0);
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| 42 | inline bool CheckStack(double& x) const
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| 43 | {
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| 44 | if (rpnstack_.empty()) return true;
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| 45 | else { x = rpnstack_.top(); return false; }
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| 46 | }
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| 47 | inline bool CheckStack(double& x, double& y)
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| 48 | {
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| 49 | if (rpnstack_.size() < 2) return true;
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| 50 | else {
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| 51 | x = rpnstack_.top(); rpnstack_.pop();
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| 52 | y = rpnstack_.top(); return false;
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | void PrintStack();
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| 57 | int SumStack(double& sx, double& sx2);
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| 58 | int ProductStack(double& px);
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| 59 |
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| 60 | stack<double> rpnstack_;
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| 61 | };
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| 62 |
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| 63 | } // namespace SOPHYA
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| 64 |
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| 65 | /* end of ifdef RPNEVALUATOR_H_SEEN */
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| 66 | #endif
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