expressionbase.h

输入一个公式

// Function.h : main header file for the FUNCTION application
//
#pragma once

////////////////////////////////////////////////////////////////////////////////
#include "afxtempl.h"
#include "value.h"

// Tree evaluation variables
#define DIVISION_BY_0			1	//被零除
#define ILEGAL_OPERATION		2	//
#define UNDEFINED_VARIABLE		3	//没有定义变量
#define INVALID_DOMAIN			4	//

//函数主键
#define OPER_SIN	150
#define OPER_COS	151
#define OPER_EXP	152
#define OPER_SQRT	153
#define OPER_LOG	154
#define OPER_TAN	155
#define OPER_CTAN	156
#define OPER_ASIN	157
#define OPER_ACOS	158
#define OPER_ATAN	159
#define OPER_FABS	160

typedef CTypedPtrMap<CMapStringToOb,CString,CValue *> CMapVariabile;
/////////////////////////////////////////////////////////////////////////////
//表达式基类：CExpressionBase，表达式执行类：CExpression
//

class DllImprotExpression CExpressionBase: public CObject  
{
public:
	DECLARE_SERIAL(CExpressionBase);

	CExpressionBase();
	CExpressionBase(CExpressionBase & expresie);
	CExpressionBase(CMapVariabile * vars);
	virtual ~CExpressionBase();

	CExpressionBase &operator=(CExpressionBase& expr);
	void AtachVariables(CMapVariabile *vars);

	struct nod 
	{
		struct nod *left,*right;
		unsigned char operatie; 
		union
		{
			double valoare;
			CString *valoarestr;
		};
	};
	
	typedef nod NOD;
	typedef nod *arbore;
	
	arbore CloneTree(void);
	int UpdateArbore(void);						// Update the tree
	arbore GetArbore();
	int Value(double & valoare);				// gets the value of the expression
	int ChangeExpression(CString& expresie);	// Change expression
	virtual void Serialize(CArchive& ar);		// The serialization function
	
private:
	arbore sgOp();
	arbore LogicalOp();
	void SkipSpaces();
	CMapVariabile * m_pVariabile;	// pointer to value table
	CString m_definitie;			// the expression in string
	int pozitie;					// string parsing variable
	arbore m_Arbore;				// the expresion as a binary tree
	
	double vexp(arbore a);
	arbore Factor(void);			// the partial expresion parsing functions
	arbore Identificator(void);
	arbore Putere(void);
	arbore Termen(void);
	arbore Expresie(void);
	void Elibmem(arbore a);
	arbore Clone(arbore arb);

	int code;	// Error code var
};