yufdlg.cpp

编译原理词法分析、语法分析等程序的实现

// Yufdlg.cpp : implementation file
//

#include "stdafx.h"
#include "词法分析.h"
#include "Yufdlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

int i;
/////////////////////////////////////////////////////////////////////////////
// CYufdlg dialog


CYufdlg::CYufdlg(CWnd* pParent /*=NULL*/)
	: CDialog(CYufdlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CYufdlg)
	m_Sc = _T("");
	m_Rc = _T("");
	//}}AFX_DATA_INIT
}


void CYufdlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CYufdlg)
	DDX_Text(pDX, IDC_CHU, m_Sc);
	DDX_Text(pDX, IDC_RU, m_Rc);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CYufdlg, CDialog)
	//{{AFX_MSG_MAP(CYufdlg)
	ON_BN_CLICKED(IDC_yfenx, Onyfenx)
	ON_BN_CLICKED(IDC_clear, Onclear)
	ON_BN_CLICKED(IDC_cancel, Oncancel)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CYufdlg message handlers

void CYufdlg::Onyfenx() 
{  
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	i=0;
	if(m_Sc!="")
        U();
	UpdateData(FALSE);

	
}
bool CYufdlg::U()
{
	E();
	return 1;
}
bool CYufdlg::E()
{
	m_Rc+="E->TG\r\n";
if(T())
	 if(G())
	 return 1;
	 else return 0;
	else
		return 0;
}
bool CYufdlg::T()
{   m_Rc+="T->FS\r\n";
	if(F())
	 if(S())
	 return 1;
	 else return 0;
	else
		return 0;
}
bool CYufdlg::F()
{ 
	switch (m_Sc[i])
	{
	case '(':  
		{
			m_Rc+="F->(E)\r\n";
			i++;
			return 1;
		}
	case 'i':
		{
           m_Rc+="F->i\r\n";
		   i++;
		   return 1;
		}
	default:
		{
		   m_Rc+="分析错误\r\n"; 
		   return 0;
		}
	}
}
bool CYufdlg::S()
{
	switch(m_Sc[i])
	{
	case '*':
		{
           m_Rc+="S->*FS\r\n";
		   i++;
		   if(F())
			   if(S())
		      return 1;
		   else 
			   return 0;

		}
	case '/':
		{
           m_Rc+="S->/FS\r\n";           
           	   i++;
		   if(F())
			   if(S())
		      return 1;
		   else 
			   return 0;
		}
    case '#':
		{
			m_Rc+="S->ε\r\n";
			m_Rc+="接受";
			return 0;
		}
	default : 
		
		{
			 m_Rc+="S->ε\r\n";  
			return 1;
		}
	}
}
bool CYufdlg::G()
{   

	switch(m_Sc[i])
	{
 	case '+':
		{
           m_Rc+="G->+TG\r\n";
		   i++;
		   if(T()) 
			   if(G())
		      return 1;
			   else 
				   return 0;
		   else 
			   return 0;

		}
	case '/':
		{
           m_Rc+="G->-TG\r\n";           
           	   i++;
		   if(T()) 
			  if(G())
		      return 1;
		   
		   else 
			   return 0;
		}
	case '#':
		{   
			m_Rc+="G->ε\r\n";
			m_Rc+="接受";
			return 0;
		}
	default : 
		
		{    
			 m_Rc+="G->ε\r\n";  
			return 1;
		}
	}
}
//i+i*i#

	

void CYufdlg::Onclear() 
{
	// TODO: Add your control notification handler code here
	m_Sc="";
	m_Rc="";
	UpdateData(FALSE);
}

void CYufdlg::Oncancel() 
{
	// TODO: Add your control notification handler code here

	CDialog::OnOK();
}