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#ifndef FORMULA_H
#define FORMULA_H
#include <stdint.h>
#include <stack>
#include "sbuffer.h"
#include "exceptionbase.h"
subExceptionDecl( ParseException );
/**
*
*/
class Formula
{
public:
Formula();
virtual ~Formula();
double run( const char *sFormula );
private:
enum
{
symEOS,
symAdd,
symSubtract,
symMultiply,
symDivide,
symOpenParen,
symCloseParen,
symNumber,
symVariable
};
typedef struct Token
{
Token() {}
Token( uint8_t nSym ) : nSym( nSym ) { }
Token( uint8_t nSym, double dNum ) : nSym( nSym ) { val.num = dNum; }
uint8_t nSym;
union
{
double num;
} val;
} Token;
std::stack<Token> sToken;
Token tLook;
int nState;
SBuffer sBuf;
private:
void push();
void state();
Token nextToken();
void printToken( Token &tok );
};
#endif
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