华北水利水电学院编译原理实验报告2010～2011学年第二学期xxxx 级计算机专业班级：xxxxx 学号：xxxxx 姓名：xxx一、实验目的通过设计、编制、调试一个典型的语法分析程序，实现对词法分析程序所提供的单词序列进行语法检查和结构分析，进一步掌握常用的语法分析方法。

二、实验要求⑴选择最有代表性的语法分析方法，如LL（1）分析法、算符优先法或LR分析法⑵选择对各种常见程序语言都用的语法结构，如赋值语句（尤指表达式）作为分析对象，并且与所选语法分析方法要比较贴切。

⑶实习时间为6小时。

三、实验内容选题1：使用预测分析法（LL（1）分析法）实现语法分析：（1）根据给定文法，先求出first集合、follow集合和select集合，构造预测分析表（要求预测分析表输出到屏幕或者输出到文件）；（2）根据算法和预测分析表分析给定表达式是否是该文法识别的正确的算术表达式（要求输出归约过程）（3）给定表达式文法为：G(E): S→TEE→+TE | εT→FKK→*FK |εF→(S)|i(4)分析的句子为：(i+i)*i和i+i)*i四、程序源代码#include "stdafx.h"#include "SyntaxAnalysis.h"#include "SyntaxAnalysisDlg.h" #ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILE static char THIS_FILE[] = __FILE__;#endif/////////////////////////////////////////// // CAboutDlg dialog used for App Aboutclass 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// Implementationprotected://{{AFX_MSG(CAboutDlg)//}}AFX_MSGDECLARE_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_MAPEND_MESSAGE_MAP()// CSyntaxAnalysisDlg dialogCSyntaxAnalysisDlg::CSyntaxAnalysisDlg(CWnd * pParent /*=NULL*/): CDialog(CSyntaxAnalysisDlg::IDD, pParent){//{{AFX_DATA_INIT(CSyntaxAnalysisDlg)m_strCode = _T("");m_strResult = _T("");//}}AFX_DATA_INIT// Note that LoadIcon does not require a subsequent DestroyIcon in Win32m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);}voidCSyntaxAnalysisDlg::DoDataExchange(CDataExc hange* pDX){CDialog::DoDataExchange(pDX);//{{AFX_DATA_MAP(CSyntaxAnalysisDlg)DDX_Control(pDX, IDC_LIST1, m_ListCtrl);DDX_Text(pDX, IDC_EDIT_Code, m_strCode);DDX_Text(pDX, IDC_EDIT_Result, m_strResult);//}}AFX_DATA_MAP}BEGIN_MESSAGE_MAP(CSyntaxAnalysisDlg, CDialog)//{{AFX_MSG_MAP(CSyntaxAnalysisDlg)ON_WM_SYSCOMMAND()ON_WM_PAINT()ON_WM_QUERYDRAGICON()ON_BN_CLICKED(IDC_BTN_Analysis, OnBTNAnalysis)//}}AFX_MSG_MAPEND_MESSAGE_MAP()// CSyntaxAnalysisDlg message handlersBOOL CSyntaxAnalysisDlg::OnInitDialog(){CDialog::OnInitDialog();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);}}SetIcon(m_hIcon, TRUE); // Set big iconSetIcon(m_hIcon, FALSE); // Set small icon// TODO: Add extra initialization here//初始化给定文法m_VN[0]="S";m_VN[1]="E";m_VN[2]="T";m_VN[3]="K";m_VN[4]="F";m_VT[0]="i";m_VT[1]="+";m_VT[2]="*";m_VT[3]="(";m_VT[4]=")";m_Gl[0]=0;m_Gr[0]="TE";m_Gl[1]=1;m_Gr[1]="+TE";m_Gl[2]=1;m_Gr[2]="ε";m_Gl[3]=2;m_Gr[3]="FK";m_Gl[4]=3;m_Gr[4]="*FK";m_Gl[5]=3;m_Gr[5]="ε";m_Gl[6]=4;m_Gr[6]="(S)";m_Gl[7]=4;m_Gr[7]="i";Cal_Symbol();Cal_First();Cal_Follow();DrawMList();return TRUE; // return TRUE unless you set the focus to a control}void CSyntaxAnalysisDlg::OnSysCommand(UINT nID, LPARAM lParam){if ((nID & 0xFFF0) == IDM_ABOUTBOX){CAboutDlg dlgAbout;dlgAbout.DoModal();}else{CDialog::OnSysCommand(nID, lParam);}}void CSyntaxAnalysisDlg::OnPaint(){if (IsIconic()){CPaintDC dc(this);SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);// Center icon in client rectangleint 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 icondc.DrawIcon(x, y, m_hIcon);}else{CDialog::OnPaint();}}CSyntaxAnalysisDlg::OnQueryDragIcon(){return (HCURSOR) m_hIcon;}void CSyntaxAnalysisDlg::Cal_Symbol() //求出能推出ε的非终结符{int i,j,k,nEnd;CString Gr[8];for (i=0;i<5;i++)m_nFlags[i]=0; //置初值，0表示否for (i=0;i<8;i++){Gr[i]=m_Gr[i];if (Gr[i]=="ε"){m_nFlags[m_Gl[i]]=1; //1表示是，即能推出ε}}do{nEnd=0;for (i=0;i<5;i++) //检查每一个非终结符{if (m_nFlags[i]==1) //如果该非终结符能推出ε，就将所有表达式右部删去该终结符{for (j=0;j<8;j++) //查找每一个表达式{if(Gr[j].IsEmpty()||Gr[j]=="ε") continue;for(k=0;k<Gr[j].GetLength();k++) //查找表达式右部的每一个字符{if(Gr[j].GetAt(k)==m_VN[i]) //找到该终结符{Gr[j]=Gr[j].Left(k)+Gr[j].Right(Gr[j].G etLength()-k-1); //删去该终结符nEnd=1;break;}}if (Gr[j].IsEmpty()) m_nFlags[m_Gl[j]]=1; //如果右部为空，就在表中填是}}}} while(nEnd);}void CSyntaxAnalysisDlg::Cal_First() //求各非终结符的First集合{int i,j,k,nEnd,n;CString strFirst;for (i=0;i<5;i++){for (j=0;j<6;j++)m_First[i][j]=0;}for (i=0;i<8;i++){if (m_Gr[i].Left(2)=="ε"){m_First[m_Gl[i]][5]=1;continue;}strFirst=m_Gr[i].GetAt(0);for (j=0;j<5;j++){if (strFirst==m_VT[j]) //如果右部第一个字符是终结符{m_First[m_Gl[i]][j]=1;break;}}}do{nEnd=0;for (i=0;i<8;i++){n=0;strFirst=m_Gr[i].GetAt(0);do{for (j=0;j<5;j++){if(strFirst==m_VN[j]) //如果右部第一个字符是非终结符{for(k=0;k<6;k++){if(m_First[m_Gl[i]][k]!=m_First[j][k]){m_First[m_Gl[i]][k]=m_First[j][k];nEnd=1;}}if(m_First[j][5]==1&&n<m_Gr[i].GetLength()-1) //前一字符能推出ε，则下一字符的first 集也包含于first(x)strFirst=m_Gr[i].GetAt(++n);elsestrFirst="";break;}}if (j==5) break;} while(!strFirst.IsEmpty());}} while(nEnd);}void CSyntaxAnalysisDlg::Cal_Follow() //求各非终结符的Follow集合{}void CSyntaxAnalysisDlg::DrawMList() //构造预测分析表{int i,j;for (i=0;i<5;i++){for (j=0;j<6;j++){m_M[i][j]="";}}m_M[0][0]="TE";m_M[0][3]="TE";m_M[1][1]="+TE";m_M[1][4]="ε";m_M[1][5]="ε";m_M[2][0]="FK";m_M[2][3]="FK";m_M[3][1]="ε";m_M[3][2]="*FK";m_M[3][4]="ε";m_M[3][5]="ε";m_M[4][0]="i";m_M[4][3]="(S)";m_ListCtrl.SetExtendedStyle(LVS_EX_GRID LINES);m_ListCtrl.InsertColumn(0,"",LVCFMT_CEN TER,50);m_ListCtrl.InsertColumn(1,"i",LVCFMT_CE NTER,50);m_ListCtrl.InsertColumn(2,"+",LVCFMT_CE NTER,50);m_ListCtrl.InsertColumn(3,"*",LVCFMT_CE NTER,50);m_ListCtrl.InsertColumn(4,"(",LVCFMT_CE NTER,50);m_ListCtrl.InsertColumn(5,")",LVCFMT_CE NTER,50);m_ListCtrl.InsertColumn(6,"#",LVCFMT_CE NTER,50);for (i=0;i<5;i++){m_ListCtrl.InsertItem(i,m_VN[i]);for (j=0;j<6;j++){if (!m_M[i][j].IsEmpty())m_ListCtrl.SetItemText(i,j+1,"→"+m_M[i][j]);}}}void CSyntaxAnalysisDlg::OnBTNAnalysis() {UpdateData(true);if (m_strCode.IsEmpty()){MessageBox("请输入要分析的句子!","提醒");return;}if (Analysis())m_strResult+="归约过程如下:\r\n\r\n"+m_sPro.Right(m_sPro.GetLength( )-3);UpdateData(false);}//主要的程序算法BOOL CSyntaxAnalysisDlg::Analysis(){CString stack[100];int pStack;//定义一个顺序栈stack[0]="#";stack[1]="S";pStack=1;//初始化栈int n=0;CString sStack,sCode,str,strCode,strPro;int i,j;strCode=m_strCode+"#"; //输入串m_sPro="<= S";strPro="S";while (1){if(n==m_strCode.GetLength()&&pStack==0) //分析成功{m_strResult="符合给定文法.";return true;}sStack=stack[pStack]; //栈顶字符sCode=strCode.GetAt(n); //剩余输入串的首字符if (sStack==sCode) //匹配{pStack--;n++;continue;}for (i=0;i<5;i++){if (sStack==m_VN[i])break;}if (i==5){m_strResult="不符合给定文法!";return false;}for (j=0;j<5;j++){if (sCode==m_VT[j])break;}if (j==5&&sCode!="#"){m_strResult="不可识别的字符:"+sCode;return false;}str=m_M[i][j];if (str.IsEmpty()){m_strResult="不符合给定文法!";return false;}if (str=="ε"){strPro=strPro.Left(n)+strPro.Right(strPro.GetLengtm_sPro="<="+strPro+"\r\n"+m_sPro;pStack--;continue;}strPro=strPro.Left(n)+str+strPro.Right(strPro.GetLength()-n-1);m_sPro="<= "+strPro+"\r\n"+m_sPro;pStack--;for (j=0;j<str.GetLength();j++){pStack++;stack[pStack]=str.GetAt(str.GetLength()-j-1);} }五、运行结果分析句子（i+i）*i正确并写出归约此次实验我继续使用VC++6.0平台编译程序，见面力求简洁，以满足实验功能为主。