Calculator.h revision 10447
110447Snilay@cs.wisc.edu#ifndef __LIBUTIL_CALCULATOR_H__ 210447Snilay@cs.wisc.edu#define __LIBUTIL_CALCULATOR_H__ 310447Snilay@cs.wisc.edu 410447Snilay@cs.wisc.edu#include <sstream> 510447Snilay@cs.wisc.edu 610447Snilay@cs.wisc.edu#include "String.h" 710447Snilay@cs.wisc.edu#include "Map.h" 810447Snilay@cs.wisc.edu#include "Assert.h" 910447Snilay@cs.wisc.edu 1010447Snilay@cs.wisc.edunamespace LibUtil 1110447Snilay@cs.wisc.edu{ 1210447Snilay@cs.wisc.edu using std::istringstream; 1310447Snilay@cs.wisc.edu 1410447Snilay@cs.wisc.edu /* 1510447Snilay@cs.wisc.edu * program: 1610447Snilay@cs.wisc.edu * END // END is end-of-input 1710447Snilay@cs.wisc.edu * expr_list END 1810447Snilay@cs.wisc.edu * 1910447Snilay@cs.wisc.edu * expr_list: 2010447Snilay@cs.wisc.edu * expression SEP expr_list // SEP is semicolon 2110447Snilay@cs.wisc.edu * expression 2210447Snilay@cs.wisc.edu * print expression 2310447Snilay@cs.wisc.edu * print STRING 2410447Snilay@cs.wisc.edu * print STRING expression 2510447Snilay@cs.wisc.edu * print STRING expression SEP expr_list 2610447Snilay@cs.wisc.edu * 2710447Snilay@cs.wisc.edu * 2810447Snilay@cs.wisc.edu * expression: 2910447Snilay@cs.wisc.edu * expression + term 3010447Snilay@cs.wisc.edu * expression - term 3110447Snilay@cs.wisc.edu * term 3210447Snilay@cs.wisc.edu * 3310447Snilay@cs.wisc.edu * term: 3410447Snilay@cs.wisc.edu * term / primary 3510447Snilay@cs.wisc.edu * term * primary 3610447Snilay@cs.wisc.edu * primary 3710447Snilay@cs.wisc.edu * 3810447Snilay@cs.wisc.edu * primary: 3910447Snilay@cs.wisc.edu * NUMBER 4010447Snilay@cs.wisc.edu * NAME 4110447Snilay@cs.wisc.edu * NAME = expression 4210447Snilay@cs.wisc.edu * NAME string expression // NAME is print 4310447Snilay@cs.wisc.edu * - primary 4410447Snilay@cs.wisc.edu * ( expression ) 4510447Snilay@cs.wisc.edu * 4610447Snilay@cs.wisc.edu * string: 4710447Snilay@cs.wisc.edu * 4810447Snilay@cs.wisc.edu **/ 4910447Snilay@cs.wisc.edu 5010447Snilay@cs.wisc.edu class Calculator 5110447Snilay@cs.wisc.edu { 5210447Snilay@cs.wisc.edu protected: 5310447Snilay@cs.wisc.edu enum Token 5410447Snilay@cs.wisc.edu { 5510447Snilay@cs.wisc.edu NAME, NAME2, NUMBER, STRING, END, 5610447Snilay@cs.wisc.edu PLUS = '+', MINUS = '-', MUL = '*', DIV = '/', 5710447Snilay@cs.wisc.edu SEP = ';', ASSIGN = '=', LP = '(', RP = ')' 5810447Snilay@cs.wisc.edu }; 5910447Snilay@cs.wisc.edu 6010447Snilay@cs.wisc.edu public: 6110447Snilay@cs.wisc.edu Calculator(); 6210447Snilay@cs.wisc.edu virtual ~Calculator(); 6310447Snilay@cs.wisc.edu 6410447Snilay@cs.wisc.edu public: 6510447Snilay@cs.wisc.edu void reset(); 6610447Snilay@cs.wisc.edu void evaluateString(const String& str_); 6710447Snilay@cs.wisc.edu 6810447Snilay@cs.wisc.edu protected: 6910447Snilay@cs.wisc.edu Token getToken(istringstream& ist_); 7010447Snilay@cs.wisc.edu double prim(istringstream& ist_, bool is_get_); 7110447Snilay@cs.wisc.edu double term(istringstream& ist_, bool is_get_); 7210447Snilay@cs.wisc.edu double expr(istringstream& ist_, bool is_get_); 7310447Snilay@cs.wisc.edu virtual double getEnvVar(const String& var_name_) const; 7410447Snilay@cs.wisc.edu 7510447Snilay@cs.wisc.edu protected: 7610447Snilay@cs.wisc.edu String m_reserved_chars_; 7710447Snilay@cs.wisc.edu Map<double> m_var_; 7810447Snilay@cs.wisc.edu 7910447Snilay@cs.wisc.edu Token m_curr_token_; 8010447Snilay@cs.wisc.edu double m_value_number_; 8110447Snilay@cs.wisc.edu String m_value_string_; 8210447Snilay@cs.wisc.edu }; // class Calculator 8310447Snilay@cs.wisc.edu} // namespace LibUtil 8410447Snilay@cs.wisc.edu 8510447Snilay@cs.wisc.edu#endif // __LIBUTIL_CALCULATOR_H__ 8610447Snilay@cs.wisc.edu 87