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
{
///

1<summary>   
2/// Form1 的摘要说明。   
3/// </summary>

public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;

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;

///

1<summary>   
2/// 必需的设计器变量。   
3/// </summary>

private System.ComponentModel.Container components = null;

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
//
}

///

1<summary>   
2/// 清理所有正在使用的资源。   
3/// </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
///

1<summary>   
2/// 设计器支持所需的方法 - 不要使用代码编辑器修改   
3/// 此方法的内容。   
4/// </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.button2.Size = new System.Drawing.Size(64, 23);
this.button2.TabIndex = 3;
this.button2.Text = "读入";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// richTextBox2
//
this.richTextBox2.Location = new System.Drawing.Point(280, 48);
this.richTextBox2.Name = "richTextBox2";
this.richTextBox2.Size = new System.Drawing.Size(280, 352);
this.richTextBox2.TabIndex = 4;
this.richTextBox2.Text = "";
//
// button3
//
this.button3.Location = new System.Drawing.Point(384, 8);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(56, 23);
this.button3.TabIndex = 5;
this.button3.Text = "保存";
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(584, 430);
this.Controls.Add(this.button3);
this.Controls.Add(this.richTextBox2);
this.Controls.Add(this.button2);
this.Controls.Add(this.richTextBox1);
this.Controls.Add(this.button1);
this.Controls.Add(this.label1);
this.MaximizeBox = false;
this.Name = "Form1";
this.Text = "Form1";
// this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

///

1<summary>   
2/// 应用程序的主入口点。   
3/// </summary>

[STAThread]
static void Main()
{
Application.Run(new Form1());
}
///

1<summary>   
2/// 词法分析函数   
3/// </summary>

///

1<param name="sender"/>

///

1<param name="e"/>

private void button1_Click(object sender, System.EventArgs e)
{
//得到想要的字符数组。
char[] getch = textToCharArray();

//将字符数组，转换为词法分析后的单词数组。
string[] stringArray = charArrayToStringArray(getch);

//将单词数组分类，用数字标出各个单词所在的类别。
string[,] twoStringArray = stringArrayToTwoStringArray(stringArray);

//用于输出二维数组。
printString(twoStringArray);

}
///

1<summary>   
2/// 输出结果 即用于输出二维数组。   
3/// </summary>

///

1<param name="twoStringArray"/>

private void printString(string[,] twoStringArray)
{
//提示说明
this.richTextBox2.Text ="1 -> 保留字" + "\r\n" +
"2 -> 运算符" + "\r\n" +
"3 -> 分隔符" + "\r\n" +
"4 -> 数字 " + "\r\n" +
"5 -> 其它" + "\r\n";
//输出二维数组中的数据
for(int x=0;x

  1<twostringarray.length "="" ";="" "\r\n";="" +="" 2;x++)="" <summary="" for(int="" if(="" this.richtextbox2.text="this.richTextBox2.Text" twostringarray[y,x]="" y="1)" {="" }="">   
  2/// 打开方件   
  3///    
  4/// <param name="sender"/>   
  5/// <param name="e"/>   
  6private void button2_Click(object sender, System.EventArgs e)// 文件打开的方法。   
  7{   
  8openFileDialog1.Filter = "文本文件(*.txt)|*.txt";   
  9openFileDialog1.Title = "打开要分析的源文件。"; 
 10
 11if(openFileDialog1.ShowDialog() == DialogResult.OK)   
 12{   
 13System.IO.StreamReader sr = new   
 14System.IO.StreamReader(openFileDialog1.FileName);   
 15this.richTextBox1.Text = sr.ReadToEnd();   
 16sr.Close();   
 17}   
 18}   
 19/// <summary>   
 20/// 保存文件   
 21/// </summary>   
 22/// <param name="sender"/>   
 23/// <param name="e"/>   
 24private void button3_Click(object sender, System.EventArgs e)   
 25{   
 26saveFileDialog1.Filter = "文本文件(*.txt)|*.txt";   
 27saveFileDialog1.Title = "保存分析结果.";   
 28if(saveFileDialog1.ShowDialog() == DialogResult.OK)   
 29{   
 30System.IO.StreamWriter wr = new   
 31System.IO.StreamWriter(saveFileDialog1.FileName);   
 32wr.Write(this.richTextBox2.Text);   
 33wr.Close();   
 34}   
 35} 
 36
 37/// <summary>   
 38/// 引用二维数组和单词的标志j   
 39/// </summary>   
 40/// <param name="twoArray"/>   
 41/// <param name="j"/>   
 42private void oneArrayToTwo(ref string[,] twoArray,ref int j)   
 43{   
 44  
 45string[,] tempArray = twoArray;   
 46twoArray = new string[2,j+2];   
 47for(int x=0;x&lt;2;x++)   
 48{   
 49for(int y=0;y<j+1;y++) <summary="" j="j+1;" twoarray[x,y]="tempArray[x,y];" {="" }="">   
 50/// 引用单词数组，和要加入单词数组的单词   
 51///    
 52/// <param name="stringArrange"/>   
 53/// <param name="st"/>   
 54private void stringToArrayString(ref string[] stringArrange, string st)   
 55{ 
 56
 57if(stringArrange[0] =="")   
 58{   
 59stringArrange[0] = st;   
 60}   
 61else   
 62{   
 63string[] oldA = stringArrange;//刚得到的字符串   
 64int i=oldA.Length +1;   
 65stringArrange = new string[i];//申请一个长一个的字符数组。   
 66oldA.CopyTo(stringArrange,0);//将先前的字符数组考到现在这个数组中。   
 67stringArrange[stringArrange.Length -1] = st;   
 68}   
 69}   
 70/// <summary>   
 71/// 将Text中的字符串，存入一个字符数组中。   
 72/// </summary>   
 73/// <returns></returns>   
 74private char[] textToCharArray()   
 75{   
 76string stringTemp;   
 77stringTemp = this.richTextBox1.Text;   
 78char[] getch = stringTemp.ToCharArray();//要处理的字符都在getch这个数组中。   
 79return getch;   
 80}   
 81/// <summary>   
 82/// 字符数组 到 单词数组   
 83/// </summary>   
 84/// <param name="getch"/>   
 85/// <returns></returns>   
 86private string[] charArrayToStringArray(char[] getch)//将字符数组转换为字符串数组。即词法分析后的单词数组。   
 87{   
 88string[] stringArrange={""} ;//用这个字符串数组存放词法分析后得到的单词。   
 89char charTemp;   
 90string stringSave = "";// 存放一个分析得到的单词 
 91
 92//一次循环因得到一个单词。   
 93for(int i = 0;i &lt; getch.Length;i++)   
 94{   
 95charTemp = getch[i];   
 96  
 97//由字母开头 数字和字母组成的单词。   
 98if( charTemp &gt;= 'a'&amp;&amp;   
 99charTemp &lt;= 'z'   
100||   
101charTemp &gt;= 'A' &amp;&amp;   
102charTemp &lt;= 'Z')   
103{   
104stringSave = charTemp.ToString();   
105i = i + 1;   
106int test = 0;//判断循环是否结束，1 为结束。   
107while(test == 0)   
108{   
109charTemp = getch[i];   
110if( charTemp &gt;= 'a'&amp;&amp;   
111charTemp &lt;= 'z'   
112||   
113charTemp &gt;= 'A' &amp;&amp;   
114charTemp &lt;= 'Z'   
115||   
116charTemp &gt;= '0' &amp;&amp;   
117charTemp &lt;= '9')   
118{   
119stringSave = stringSave + charTemp.ToString();   
120i = i + 1;   
121}   
122else   
123test = 1;   
124}   
125stringToArrayString(ref stringArrange,stringSave);   
126}   
127stringSave = "";   
128//由数字组成的单词。   
129if( charTemp &gt;= '0' &amp;&amp;   
130charTemp &lt;= '9')   
131{   
132stringSave = stringSave + charTemp.ToString();   
133i = i + 1;   
134int test1 = 0;   
135while(test1 == 0)   
136{   
137charTemp = getch[i];   
138if( charTemp &gt;= '0' &amp;&amp;   
139charTemp &lt;= '9')   
140{   
141stringSave = stringSave + charTemp.ToString();   
142i = i + 1;   
143}   
144else   
145test1 = 1;   
146}   
147stringToArrayString(ref stringArrange,stringSave);   
148}   
149stringSave = "";   
150//由运算符组成的单词。   
151if( charTemp == '+'   
152|| charTemp == '-'   
153|| charTemp == '*'   
154|| charTemp == '/'   
155|| charTemp == '='   
156|| charTemp == '&lt;'   
157|| charTemp == '&gt;'   
158|| charTemp == '!')   
159{   
160stringSave = stringSave + charTemp.ToString();   
161i = i + 1;   
162int test2 = 0;   
163while(test2 == 0)   
164{   
165charTemp = getch[i];   
166if( charTemp == '+'   
167|| charTemp == '-'   
168|| charTemp == '*'   
169|| charTemp == '/'   
170|| charTemp == '='   
171|| charTemp == '&lt;'   
172|| charTemp == '&gt;'   
173|| charTemp == '!')   
174{   
175stringSave = stringSave + charTemp.ToString();   
176i = i + 1;   
177}   
178else   
179test2 = 1;   
180}   
181stringToArrayString(ref stringArrange,stringSave);   
182}   
183stringSave = "";   
184//由介符组成的单词。   
185if( charTemp == '('   
186||charTemp == ')'   
187||charTemp == '{'   
188||charTemp == '}'   
189||charTemp == '['   
190||charTemp == ']'   
191||charTemp == ','   
192||charTemp == ':'   
193||charTemp == ';'   
194||charTemp == '"'   
195||charTemp == '\''   
196||charTemp == '\\\')   
197{   
198stringSave = stringSave + charTemp.ToString();   
199stringToArrayString(ref stringArrange,stringSave);   
200}   
201}   
202return stringArrange;   
203}   
204/// <summary>   
205/// 单词数组 到 二维单词数组。   
206/// </summary>   
207/// <param name="stringArray"/>   
208/// <returns></returns>   
209private string[,] stringArrayToTwoStringArray(string[] stringArray)   
210{   
211//存放单词标识后的结果。   
212string [,] twoArray = new string[2,1];   
213//单词的标志   
214int j=0; 
215
216  
217//每循环一次，把一个单词归于一类，即前面加上一个数字。   
218for(int i=0;i<stringarray.length;i++) "="" )="" 1="" 2="" 3="" 4="" ;="" else="" if(="" j);="" stringarray[i]="*/" stringarray[i].tochararray()[0]="" this.onearraytotwo(ref="" twoarray,ref="" twoarray[0,j]="3" twoarray[1,j]="stringArray[i];" {="" ||="" }="" 保留字="" 分隔符="" 数字="" 运算符="">='0' &amp;&amp;   
219stringArray[i].ToCharArray()[0] &lt;= '9')   
220{   
221twoArray[0,j] = "4";//数字   
222twoArray[1,j] = stringArray[i];   
223this.oneArrayToTwo(ref twoArray,ref j);   
224}   
225//其它 5(变量等)   
226else   
227{   
228twoArray[0,j] = "5";   
229twoArray[1,j] = stringArray[i];   
230this.oneArrayToTwo(ref twoArray,ref j);   
231}   
232}   
233return twoArray;   
234} 
235
236}   
237}</stringarray.length;i++)></j+1;y++)></twostringarray.length>