#ifndef _COMPUTER_H_
#define _COMPUTER_H_

#include <stack>
using namespace std;

#define LEVELS						6
#define DERROR						0
#define BIGNUMBER					0			//计算出错时，赋零
#define UNARY						0
#define BINARY						1


/* 运算符类 */
class COperator
{
public:
	COperator();
	~COperator();
	CString m_operator;
	WORD m_level;
	WORD m_type;
	WORD m_startIndex;
};
typedef stack<COperator*> OperatorStack;


/* 运算数类 */
class COperand  
{
public:
	COperand();
	~COperand();
	BOOL operator ==(const COperand&od);
	CString m_name;
	BOOL m_IsConst;
	WORD m_startIndex;
};
typedef stack<COperand*> OperandStack;


/* 计算基类 */ 
class CComputer : public CObject
{
public:
	void Destroy();
	BOOL ExpressionIsError();
	CString GetDigitalString(double* variantValue=0,int num=-1);
	int GetErrorNumber();
	CString GetErrorInformation();
	double computer(double variantValue[],int num);
	void SetFormula(CString formula);
	CComputer(char*formula=0);
	int GetVariantTableSize(){return m_oprandANum;}
	const COperand* GetVariantTable();
	~CComputer();

public:
	int m_oprandNum;
	int m_oprandANum;
	int m_operatorNum;
	CString m_formula;
	COperator*m_operator;
	COperand*m_oprand;
	COperand*m_oprandA;
	int IsFormula();
	BOOL GetStack(OperatorStack &Op, OperandStack &Od);
	BOOL Initialize();
	double Computer(OperatorStack &Operator, OperandStack &Oprand);
	BOOL EmptyStack(OperatorStack st);
	BOOL EmptyStack(OperandStack st);
	BOOL GetOperandStack(OperandStack&Oprand,CString&string);
	virtual BOOL GetOperatorStack(OperatorStack&Operator,CString &string);
	virtual double computing(const COperator*op,const COperand*oprand);
	virtual double computing(const COperator*op,const COperand*Loprand,const COperand*Roprand);
};


/* 实时计算类 */
class CRealComputer :public CComputer
{
public:
	CString m_strExpression;
	virtual BOOL GetOperatorStack(OperatorStack&Operator,CString &string);
	virtual double computing(const COperator*op,const COperand*oprand);
	virtual double computing(const COperator*op,const COperand*Loprand,const COperand*Roprand);
	virtual int IsFormula();
	double  GetResult();
};

#endif //_COMPUTER_H_