编译器（词法分析，语法分析）

package byqForYffx; import java.awt.Container; import java.awt.Font; import java.awt.TextArea; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.Vector; import javax.swing.JButton; import javax.swing.JDialog; import javax.swing.JFileChooser; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.filechooser.FileNameExtensionFilter; import javax.swing.table.DefaultTableModel; //还没写完，后面的交给你了，学长只能帮你到这了。。。 public class For_LL1 { JDialog winJD; File f = null; String filename = null; BufferedReader br = null; DefaultTableModel dtm; String[] lines; TextArea TA_file_LL1; TextArea TA_firstset; TextArea TA_followset; TextArea TA_ycfx_table; TextArea TA_fxjz_file; TextArea TA_fxxs_table; int flag = 0; String Vn[] = null; Vector<String> P = null; int Vnnum = 0, k; int firstComplete[] = null;// 存储已判断过first的数据 char first[][] = null;// 存储最后first结果 int followComplete[] = null;// 存储已判断过follow的数据 char follow[][] = null;// 存储最后follow结果 char ycfx_table[][] = null;// int LL = 0;// 标记是否为LL（1） String vt_tou[] = null;// 储存Vt Object shuju[][] = null;// 存储表达式数据 char yn_null[] = null;// 存储能否推出空 public void Window(Byq_Win jframe) { winJD = new JDialog(jframe, "LL1预测分析--by ***"); winJD.setVisible(true); winJD.setSize(1000, 700); winJD.setLayout(null); winJD.setResizable(false); winJD.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE); winJD.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { winJD.dispose(); } }); JButton jBu_open = new JButton("打开文件");// 打开文件按钮 jBu_open.setBounds(2, 10, 90, 30); winJD.getContentPane().add(jBu_open); JButton jBu_save = new JButton("保存文件");// 保存文件按钮 jBu_save.setBounds(100, 10, 90, 30); winJD.getContentPane().add(jBu_save); JButton jBu_getfirstset = new JButton("求First集");// 求first集按钮 jBu_getfirstset.setBounds(200, 10, 90, 30); winJD.getContentPane().add(jBu_getfirstset); JButton jBu_getfollowset = new JButton("求Follow集");// ... jBu_getfollowset.setBounds(300, 10, 100, 30); winJD.getContentPane().add(jBu_getfollowset); JButton jBu_get_ycfx_table = new JButton("构造预测分析表");// ... jBu_get_ycfx_table.setBounds(590, 10, 130, 30); winJD.getContentPane().add(jBu_get_ycfx_table); JButton jBu_yjxs = new JButton("一键显示"); jBu_yjxs.setBounds(430, 380, 100, 30); winJD.getContentPane().add(jBu_yjxs); JButton jBu_dbxs = new JButton("单步显示"); jBu_dbxs.setBounds(550, 380, 100, 30); winJD.getContentPane().add(jBu_dbxs); JButton jBu_exit = new JButton("退出"); jBu_exit.setBounds(860, 10, 90, 30); winJD.getContentPane().add(jBu_exit); JLabel jLabel1 = new JLabel("原始文法：请输入形如E->abc的LL1文法，其中的空字符用$代替"); jLabel1.setBounds(10, 50, 400, 20); jLabel1.setFont(new Font("黑体", 0, 13)); winJD.getContentPane().add(jLabel1); TA_file_LL1 = new TextArea();// LL1文法文本文件显示区域 TA_file_LL1.setBounds(2, 75, 400, 180); TA_file_LL1.setFont(new Font("黑体", 0, 15));// 字体属性 winJD.getContentPane().add(TA_file_LL1); JLabel jLabel2 = new JLabel("First集"); jLabel2.setBounds(10, 260, 400, 20); jLabel2.setFont(new Font("黑体", 0, 13)); winJD.getContentPane().add(jLabel2); TA_firstset = new TextArea();// first集显示区域 TA_firstset.setBounds(2, 280, 400, 180); TA_firstset.setFont(new Font("黑体", 1, 15));// 字体属性 winJD.getContentPane().add(TA_firstset); TA_firstset.setFocusable(false); JLabel jLabel3 = new JLabel("Follow集"); jLabel3.setBounds(10, 465, 400, 20); jLabel3.setFont(new Font("黑体", 0, 13)); winJD.getContentPane().add(jLabel3); TA_followset = new TextArea();// follow集显示区域 TA_followset.setBounds(2, 485, 400, 180); TA_followset.setFont(new Font("黑体", 1, 15));// 字体属性 winJD.getContentPane().add(TA_followset); TA_followset.setFocusable(false); JLabel jLable4 = new JLabel("预测分析表"); jLable4.setBounds(430, 50, 400, 20); jLable4.setFont(new Font("黑体", 0, 13)); winJD.getContentPane().add(jLable4); TA_ycfx_table = new TextArea(); TA_ycfx_table.setBounds(430, 75, 550, 249); TA_ycfx_table.setFont(new Font("黑体", 1, 15));// 字体属性 winJD.getContentPane().add(TA_ycfx_table); TA_ycfx_table.setFocusable(false); dtm = new DefaultTableModel(); JLabel jLable5 = new JLabel("分析句子:"); jLable5.setBounds(430, 335, 60, 20); jLable5.setFont(new Font("黑体", 0, 13)); winJD.getContentPane().add(jLable5); TA_fxjz_file = new TextArea();// 分析句子文本显示区域 TA_fxjz_file.setBounds(500, 335, 500, 40); TA_fxjz_file.setFont(new Font("黑体", 1, 15)); winJD.getContentPane().add(TA_fxjz_file); TA_fxxs_table = new TextArea(); TA_fxxs_table.setBounds(430, 415, 550, 250); TA_fxxs_table.setFont(new Font("黑体", 1, 15)); winJD.getContentPane().add(TA_fxxs_table); TA_fxxs_table.setFocusable(false); // 监听器安装 jBu_open.addActionListener(new ActionListener() {// 打开读取文件 public void actionPerformed(ActionEvent e) { JFileChooser chooser = new JFileChooser(); FileNameExtensionFilter filter = new FileNameExtensionFilter( "TXT", "txt"); chooser.setFileFilter(filter); int returnVal = chooser.showOpenDialog(getParent()); if (returnVal == JFileChooser.APPROVE_OPTION) { f = chooser.getSelectedFile(); filename = chooser.getSelectedFile().getPath() .toString(); } else filename = null; TA_file_LL1.setText(""); try { br = new BufferedReader(new FileReader(filename)); } catch (FileNotFoundException e1) { e1.printStackTrace(); } String text; try { while ((text = br.readLine()) != null) TA_file_LL1.append(text + "\n"); } catch (IOException e1) { e1.printStackTrace(); } openFile(filename); } }); jBu_save.addActionListener(new ActionListener() {// 保存文件 public void actionPerformed(ActionEvent e) { String s = f.getAbsolutePath(); if (s.equals("") || s == null) { JOptionPane.showMessageDialog(null, "路径为空,请检查!"); return; } saveFile(s); } }); jBu_exit.addActionListener(new ActionListener() {// 退出 public void actionPerformed(ActionEvent e) { winJD.dispose();// 退出 } }); jBu_getfirstset.addActionListener(new ActionListener() {// 求firsta集 @Override public void actionPerformed(ActionEvent arg0) { TA_firstset.setText(""); Vn = new String[100]; P = new Vector<String>(); String s[] = TA_file_LL1.getText().split("\n"); for (int i = 0; i < s.length; i++) { if (s.length < 2) { TA_firstset.setText("文法输入有误，请重新输入");// 判断长度是否符合 return; } if (s[i].charAt(0) <= 'Z' && s[i].charAt(0) >= 'A' && s[i].charAt(1) == '→') { for (k = 0; k < Vnnum; k++) { if (Vn[k].equals(s[i].substring(0, 1))) { break; } } if (Vnnum == 0 || k >= Vnnum) { Vn[Vnnum] = s[i].substring(0, 1);// 存入Vn数据 Vnnum++; } P.add(s[i]); } else { TA_firstset.setText("文法输入有误，请重新输入"); return; } } yn_null = new char[100]; first = new char[Vnnum][100];