mainframe.java~4~

java编的PL/0词法编译器

package compiler;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class MainFrame extends JFrame {
  private JPanel contentPane;
  private BorderLayout borderLayout1 = new BorderLayout();
  private JMenuBar jMenuBar=new JMenuBar();
  private JMenu jMenuFile=new JMenu("文件");
  private JMenuItem jMenuFile_New=new JMenuItem("新建...");
  private JMenuItem jMenuFile_Open=new JMenuItem("打开...");
  private JMenuItem jMenuFile_Close=new JMenuItem("关闭...");
  private JMenuItem jMenuFile_Save=new JMenuItem("保存");
  private JMenuItem jMenuFile_SaveAs=new JMenuItem("另存为...");
  private JMenuItem jMenuFile_Exit=new JMenuItem("退出");
  private JMenu jMenuRun=new JMenu("运行");
  private JMenuItem jMenuRun_Lexical=new JMenuItem("词法分析");
  private JMenuItem jMenuRun_Syntax=new JMenuItem("语法分析");
  private JMenuItem jMenuRun_Compile=new JMenuItem("编译");
  private JMenuItem jMenuRun_CloseResultPane=new JMenuItem("关闭调试窗口");
  private JMenu jMenuHelp=new JMenu("帮助");
  private JMenuItem jMenuHelp_About=new JMenuItem("关于...");


  private String currentDirectory="C:";//当前目录
  private File currentFile;//当前文件
  private LinkedList openFile;//打开文件列表,元素为File类型
  private LinkedList edited;//标识文件是否被修改过,元素为Boolean类型
  private LinkedList editPane;//编辑窗口列表,元素为JTextArea类型
  private HashMap resultPane;//编译结果窗口散列表,关键字为相应的editPane元素,值为为JTextArea类型
  private JTabbedPane jTabbedPane;//活页夹
  private LinkedList workPane;//活页上的工作区域列表
  private final int NEW=0;//创建新文件
  private final int OVERRIDE=1;//创建新文件并覆盖已有的同名文件
  private final int WRITE=2;//对当前文件进行写操作(强制覆盖)

  //Construct the frame
  public MainFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(600, 450));
    this.setTitle("PL/O语言编译器");
    jMenuFile_New.addActionListener(new MainFrame_jMenuFile_New_actionAdapter(this));
    jMenuFile.add(jMenuFile_New);
    jMenuFile.add(jMenuFile_Open);
    jMenuFile.addSeparator();
    jMenuFile.add(jMenuFile_Save);
    jMenuFile.add(jMenuFile_SaveAs);
    jMenuFile.add(jMenuFile_Close);
    jMenuFile.addSeparator();
    jMenuFile.add(jMenuFile_Exit);
    jMenuBar.add(jMenuFile);
    jMenuRun.add(jMenuRun_Lexical);
    jMenuRun.add(jMenuRun_Syntax);
    jMenuRun.add(jMenuRun_Compile);
    jMenuRun.addSeparator();
    jMenuRun.add(jMenuRun_CloseResultPane);
    jMenuBar.add(jMenuRun);
    jMenuHelp.add(jMenuHelp_About);
    jMenuBar.add(jMenuHelp);
    this.setJMenuBar(jMenuBar);

    jTabbedPane=new JTabbedPane(JTabbedPane.BOTTOM);
    contentPane.add(jTabbedPane,BorderLayout.CENTER);

    openFile=new LinkedList();
    edited=new LinkedList();
    editPane=new LinkedList();
    resultPane=new HashMap();
    workPane=new LinkedList();
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  //文件存储方法,参数createNewFile标识是否创建新文件,参数override标识当所选文件夹下已有
  //同名文件时是否将其覆盖(仅在createNewFile的情况下才起作用),参数write标识是否对文件进
  //行写操作(强制覆盖)
  private void saveFile(int type){
    if(type==NEW){
      try{
        currentFile.createNewFile();
      }catch(IOException ioe){
        System.out.println("编译器在新建PL/O源文件时出错!");
      }
    }

    if(type==OVERRIDE){
      try{
        FileWriter fWriter = new FileWriter(currentFile);
        fWriter.write("");
        fWriter.close();
      }catch(IOException ioe){
        System.out.println("编译器在覆盖已有文件时出错!");
      }
    }

    if(type==WRITE){
      try{
        FileWriter fWriter=new FileWriter(currentFile);
        JTextArea area=(JTextArea)editPane.get(jTabbedPane.getSelectedIndex());
        String str=area.getText();
        fWriter.write(str);
        fWriter.close();
      }catch(IOException ioe){
        System.out.println("编译器在存储PL/O源文件时出错!");
      }
    }
  }

  //"新建..."菜单事件响应
  void jMenuFile_New_actionPerformed(ActionEvent e){
    String selectedDirectory=currentDirectory;
    while(true){
        //新建JFileChooser
        JFileChooser fileChooser = new JFileChooser(selectedDirectory);
        fileChooser.setFileFilter(new SourceFileFilter());
        fileChooser.setDialogTitle("新建PL/O源程序文件");
        fileChooser.setDialogType(JFileChooser.SAVE_DIALOG);
        fileChooser.showSaveDialog(this);
        File file = fileChooser.getSelectedFile();

        if (file == null) { //未选择文件
          return;
        }

        selectedDirectory=(fileChooser.getCurrentDirectory()).toString();
        File selectedFile= new File(selectedDirectory, file.getName() + ".src");

        if (selectedFile.exists()) {
          System.out.println("文件已存在!");
        }else{
          currentDirectory = (fileChooser.getCurrentDirectory()).toString();
          currentFile = new File(currentDirectory, file.getName() + ".src");
          this.saveFile(NEW);
          return;
        }
      }
    }
}

class MainFrame_jMenuFile_New_actionAdapter implements java.awt.event.ActionListener {
  MainFrame adaptee;

  MainFrame_jMenuFile_New_actionAdapter(MainFrame adaptee) {
    this.adaptee = adaptee;
  }
  public void actionPerformed(ActionEvent e) {
    adaptee.jMenuFile_New_actionPerformed(e);
  }
}