编译原理——简单的四则运算

编译原理课程设计——实现简单的四则元算，包括词法分析、语法分析、语义分析

package com.panhanchun.simpleParser;
/**
 * @author 潘汉春
 * @note Demonstrate the Parser
 * @date 15/01/2007
 * 
 */
import javax.swing.*;

import java.awt.*;              //for layout managers and more
import java.awt.event.*;        //for action events

@SuppressWarnings（“serial“）
public class Demo extends JPanel
                             implements ActionListener {
    protected static final String textFieldString = “算术表达式“;
    protected static final String buttonString = “JButton“;

    protected JLabel actionLabel;
    protected JTextArea textArea0;
    protected JTextArea textArea1;

    public Demo（） {
        setLayout（new BorderLayout（））;
       
        //Create a regular text field.
        JTextField textField = new JTextField（25）;
        textField.setActionCommand（textFieldString）;
        textField.addActionListener（this）;

        //Create some labels for the fields.
        JLabel textFieldLabel = new JLabel（textFieldString + “: “）;
        textFieldLabel.setLabelFor（textField）;
     
        //Create a label to put messages during an action event.
        actionLabel = new JLabel（“运行结果“）;
        actionLabel.setBorder（BorderFactory.createEmptyBorder（25000））;

        //Lay out the text controls and the labels.
        JPanel textControlsPane = new JPanel（）;
        GridBagLayout gridbag = new GridBagLayout（）;

        textControlsPane.setLayout（gridbag）;

        JLabel[] labels = {textFieldLabel};
        JTextField[] textFields = {textField};
        addLabelTextRows（labels textFields gridbag textControlsPane）;
        
        textControlsPane.setBorder（
                BorderFactory.createCompoundBorder（
                                BorderFactory.createtitledBorder（“输入“）
                                BorderFactory.createEmptyBorder（5555）））;
        
        //Create a text area.
        textArea0 = new JTextArea（““）;
        JScrollPane areaScrollPane0 = new JScrollPane（textArea0）;
        areaScrollPane0.setVerticalScrollBarPolicy（
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS）;
        areaScrollPane0.setPreferredSize（new Dimension（250 250））;
        areaScrollPane0.setBorder（
            BorderFactory.createCompoundBorder（
                BorderFactory.createCompoundBorder（
                                BorderFactory.createtitledBorder（“词法分析“）
                                BorderFactory.createEmptyBorder（5555））
                areaScrollPane0.getBorder（）））;
        
        //Create a text area.
        textArea1 = new JTextArea（““）;
        JScrollPane areaScrollPane1 = new JScrollPane（textArea1）;
        areaScrollPane1.setVerticalScrollBarPolicy（
                        JScrollPane.VERTICAL_SCROLLBAR_ALWAYS）;
        areaScrollPane1.setPreferredSize（new Dimension（250 150））;
        areaScrollPane1.setBorder（
            BorderFactory.createCompoundBorder（
                BorderFactory.createCompoundBor

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        301  2009-08-07 21:49  simpleParser\.classpath

     文件        388  2009-08-07 21:49  simpleParser\.project

     文件        629  2009-08-07 21:49  simpleParser\.settings\org.eclipse.jdt.core.prefs

     文件        552  2009-09-01 11:12  simpleParser\bin\com\panhanchun\simpleParser\Demo$1.class

     文件       5693  2009-09-01 11:12  simpleParser\bin\com\panhanchun\simpleParser\Demo.class

     文件       5076  2009-09-01 11:12  simpleParser\bin\com\panhanchun\simpleParser\Parser.class

     文件        516  2009-09-01 11:12  simpleParser\bin\com\panhanchun\simpleParser\ParserException.class

     文件       6866  2009-08-07 22:02  simpleParser\src\com\panhanchun\simpleParser\Demo.java

     文件       7527  2009-08-07 21:51  simpleParser\src\com\panhanchun\simpleParser\Parser.java

     目录          0  2009-09-01 11:12  simpleParser\bin\com\panhanchun\simpleParser

     目录          0  2009-08-07 21:50  simpleParser\src\com\panhanchun\simpleParser

     目录          0  2009-09-01 11:12  simpleParser\bin\com\panhanchun

     目录          0  2009-08-07 21:50  simpleParser\src\com\panhanchun

     目录          0  2009-09-01 11:12  simpleParser\bin\com

     目录          0  2009-08-07 21:50  simpleParser\src\com

     目录          0  2009-08-07 21:49  simpleParser\.settings

     目录          0  2009-09-01 11:12  simpleParser\bin

     目录          0  2009-08-07 21:50  simpleParser\src

     目录          0  2009-08-07 21:49  simpleParser

----------- ---------  ---------- -----  ----

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