scannerdlg.cpp

自己在学习编译原理时用VC++写的词法分析器

// ScannerDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Scanner.h"
#include "ScannerDlg.h"
#include "Vocabulary.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScannerDlg dialog
CScannerDlg::CScannerDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CScannerDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CScannerDlg)
	m_result = _T("");
	m_source = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CScannerDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CScannerDlg)
	DDX_Control(pDX, IDC_EDIT_SOURCE, m_edit_source);
	DDX_Control(pDX, IDC_EDIT_RESULT, m_edit_result);
	DDX_Text(pDX, IDC_EDIT_RESULT, m_result);
	DDX_Text(pDX, IDC_EDIT_SOURCE, m_source);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CScannerDlg, CDialog)
	//{{AFX_MSG_MAP(CScannerDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_SCAN, OnScan)
	ON_BN_CLICKED(IDC_BUTTON1, Onclear)
	ON_BN_CLICKED(IDC_BUTTON2, OnCancel)
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScannerDlg message handlers

BOOL CScannerDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CScannerDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CScannerDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CScannerDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CScannerDlg::OnScan() 
{
	// TODO: Add your control notification handler code here
    if(ends=true)
	{
		ch=' ';
		code=0;
		ends=false;
		for(int i=0;i<50;i++)
		{
	      Identifier[i]="";
		}
    	for(i=0;i<50;i++)
		{
	       Const[i]="";
		}
	    for(i=0;i<50;i++)
		{
	       PrimaryKey[i]=0;
		}

		strToken="";
	    point=0;
		m_result="";
		m_source="";
		strToken="";
		for(i=0;i<50;i++)
		{
	       Symbol[i]="";
		}
	}
	CString cc;
	UpdateData(true);
	int length=m_source.GetLength();
	if(m_source=="")
	{
		return;
	}

	while(point<length)
	{   
		strToken="";
		str=false;
		ch=GetChar();
		GetBC();
		if(IsLetter())
		{   
			while( IsLetter() || IsDigit() )
			{
				Concat();
                ch=GetChar();
			}
			Retract();
			code=Reserve();
			if(strToken=="true"||strToken=="false")
				 value=InsertConst();
			
			else if(code==0&&strToken!="true"&&strToken!="false")
			{
                value=InsertId();
				strToken="";
				//return ($ID ,value);
			}
			else
			{
                PrimaryKey[code]=1;
				strToken="";
				//return  (code,-);
			}
		}
		else if(IsDigit())
			{   
			    int x=0;
				while(IsDigit())
				{
					Concat();
					ch=GetChar();
					if(ch=='.')
					{
						x++;
					    strToken+='.';
						ch=GetChar();
					}
				}
				if(x<2)
				{
					Retract();
				    value=InsertConst();
				}
				else
				{
		            Retract();
				    value=InsertId();
				}
				//return ( $ int ,value);
			}
			else 
			{
				Concat();
				//else
				//{
					if(strToken=="+")
					{
						ch=GetChar();
						if(ch=='+'||ch=='=')
						Concat();
						else
							Retract();
					}
					if(strToken=="-")
					{
						ch=GetChar();
						if(ch=='-'||ch=='=')
							Concat();
						else
							Retract();
					}
					if(strToken=="*")
					{
						ch=GetChar();
						if(ch=='=')
							Concat();
						else
							Retract();
					}
                    if(strToken=="/")
					{
						ch=GetChar();
						if(ch=='=')
							Concat();
						else
							Retract();
					}
			         if(strToken=="=")
					{
						ch=GetChar();
						if(ch=='=')
							Concat();
						else
							Retract();
					}
				value=InsertSymbol();
				//}
			}
		}
	m_result="";
	ShowOut();
	ends=true;
}


char CScannerDlg::GetChar()
{   
	
	char ch=m_source.GetAt(point);
    point++;
    return ch;
}
void CScannerDlg::GetBC()
{
	while(ch==' ')
	{
		ch=GetChar();
	}
}
BOOL CScannerDlg::IsLetter()
{
   if((ch>='A'&& ch<='Z') || (ch>='a'  &&   ch<='z'))
   {
	   return TRUE;
   }
   return FALSE;
}
BOOL CScannerDlg::IsDigit()
{
	if(ch>='0'  &&  ch<='9')
	{
	    return TRUE;
	}
	return FALSE;
}
void CScannerDlg::Concat()
{
	strToken+=ch;
}
void CScannerDlg::Retract()
{
	point--;
	ch=' ';
}
int CScannerDlg::Reserve()   /// 是否是关键字
{
	CVocabulary bu;
	int p=bu.GetCode(strToken);  ///// 是否是关键字
	return p;
}
int CScannerDlg::InsertId()  //插入标志符
{
	for(int i=0;i<50;i++)
	{
		if(strToken==Identifier[i])
		{  	
			strToken="";
			break ;
		}
		if(Identifier[i]=="")
		{
			Identifier[i]=strToken;
			strToken="";
			break ;
		}
	}

	return i;
}
int CScannerDlg::InsertConst()   //插入常数
{
	for(int i=0;i<50;i++)
	{
		if(Const[i]==strToken)
		{
			strToken="";
			return i;
		}
		if(Const[i]=="")
		{
			Const[i]=strToken;
			strToken="";
			return i;
		}
	}
	return i;
}
int CScannerDlg::InsertSymbol()//插入符号
{
	CVocabulary bu;

	for(int i=51;i<94;i++)
	{
		if(strToken==bu.Vocabulary[i])
		{
			Symbol[i-50]=1;
			break;
		}
	}
	return i;
}

void CScannerDlg::ShowOut()
{
	m_result+="-------关键字-------";
	m_result+="\r\n";
	CVocabulary bu;
	for(int i=1;i<39;i++)
	{
		if(PrimaryKey[i]==1)
		{	
			m_result+=bu.Vocabulary[i];
            m_result+="\r\n";
		}
	}
	m_result+="-------符号--------";
	m_result+="\r\n";
	for(i=51;i<94;i++)
	{
		if(Symbol[i-50]==1)
		{
			m_result+=bu.Vocabulary[i];
			m_result+="\r\n";
		}
	}
	m_result+="-------标识符--------";
	m_result+="\r\n";
	for(i=0;i<50;i++)
	{
		if(Identifier[i]!="")
		{
            m_result+=Identifier[i];
			m_result+="\r\n";
		}
	}
	m_result+="--------常数-------";
	m_result+="\r\n";
	for(i=0;i<50;i++)
	{
		if(Const[i]!="")
		{
			m_result+=Const[i];
			m_result+="\r\n";
		}
	}
	UpdateData(false);
}


void CScannerDlg::Onclear() 
{
	// TODO: Add your control notification handler code here
	char strfile[]="文本文件 (*.txt)|*.txt|C++源文件 (*.cpp)|*.cpp|C++头文件 (*.h)|*.h|所有文件 (*.*)|*.*|";
	CString cs;
	char buf[10000];
	int nByteRead;
	int len;
	CFileDialog *dlg=new CFileDialog(true,NULL,NULL,OFN_HIDEREADONLY|OFN_OVERWRITEPROMPT,strfile);
	if(dlg->DoModal()==IDOK)
	{
		CFile file;
		if(!file.Open(dlg->GetFileName(),CFile::modeRead))
		{
			MessageBox("指定文件不存在","提示",MB_ICONEXCLAMATION);
			return;
		}
        len=file.GetLength();
		if(len>9999)
		{
			MessageBox("文件过长","提示",MB_ICONINFORMATION);
			return;
		}
		nByteRead=file.Read(buf,len);
        for(int i=0;i<nByteRead;i++)
		{
		    cs+=buf[i];		
		}
        m_source="";
		m_source=cs;
			
		UpdateData(false);
	}
	delete dlg;
}

void CScannerDlg::OnCancel() 
{
	// TODO: Add your control notification handler code here
	CDialog::OnCancel();
}

void CScannerDlg::OnButton3() 
{
	// TODO: Add your control notification handler code here
	m_source.Empty();
	m_result.Empty();
	UpdateData(false);
}