【图】一个用C＃写的词法分析程序

源文件内容：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace wzy2
{
/// <summary
/// Form1 的摘要说明。
/// </summary
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;

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private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;

private System.Windows.Forms.RichTextBox richTextBox1;
private System.Windows.Forms.RichTextBox richTextBox2;

private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.SaveFileDialog saveFileDialog1;

/// <summary
/// 必需的设计器变量。
/// </summary
private System.ComponentModel.Container components = null;

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public Form1()
{
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
}

/// <summary
/// 清理所有正在使用的资源。
/// </summary
protected override void Dispose( bool disposing )
{
   if( disposing )
   {
    if (components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary
private void InitializeComponent()
{
   this.label1 = new System.Windows.Forms.Label();
   this.button1 = new System.Windows.Forms.Button();
   this.richTextBox1 = new System.Windows.Forms.RichTextBox();
   this.button2 = new System.Windows.Forms.Button();
   this.richTextBox2 = new System.Windows.Forms.RichTextBox();
   this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
   this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
   this.button3 = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(8, 8);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(72, 24);
   this.label1.TabIndex = 0;
   this.label1.Text = "词法分析";
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(240, 8);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(64, 23);
   this.button1.TabIndex = 1;
   this.button1.Text = "分析";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // richTextBox1
   //
   this.richTextBox1.Location = new System.Drawing.Point(24, 48);
   this.richTextBox1.Name = "richTextBox1";
   this.richTextBox1.Size = new System.Drawing.Size(240, 352);
   this.richTextBox1.TabIndex = 2;
   this.richTextBox1.Text = "";
// this.richTextBox1.TextChanged += new System.EventHandler(this.richTextBox1_TextChanged);
   //
   // button2
   //
   this.button2.Location = new System.Drawing.Point(96, 8);
   this.button2.Name = "button2";
   this.