form1.cs

c#写的词法分析

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace word
{ 
/// <summary> 
/// Form1 的摘要说明。 
/// </summary> 
public class Form1 : System.Windows.Forms.Form
{ 

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

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

private System.Windows.Forms.OpenFileDialog openFileDialog1;
private Button button3;
private RichTextBox richTextBox3;
private Label label1; 

/// <summary> 
/// 必需的设计器变量。 
/// </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 
// 
} 

/// <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.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.button3 = new System.Windows.Forms.Button();
    this.richTextBox3 = new System.Windows.Forms.RichTextBox();
    this.label1 = new System.Windows.Forms.Label();
    this.SuspendLayout();
    // 
    // button1
    // 
    this.button1.Location = new System.Drawing.Point(276, 8);
    this.button1.Name = "button1";
    this.button1.Size = new System.Drawing.Size(64, 23);
    this.button1.TabIndex = 1;
    this.button1.Text = "词法分析";
    this.button1.Click += new System.EventHandler(this.button1_Click);
    // 
    // richTextBox1
    // 
    this.richTextBox1.Location = new System.Drawing.Point(12, 48);
    this.richTextBox1.Name = "richTextBox1";
    this.richTextBox1.Size = new System.Drawing.Size(188, 352);
    this.richTextBox1.TabIndex = 2;
    this.richTextBox1.Text = "";
    // 
    // 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(206, 48);
    this.richTextBox2.Name = "richTextBox2";
    this.richTextBox2.Size = new System.Drawing.Size(195, 352);
    this.richTextBox2.TabIndex = 4;
    this.richTextBox2.Text = "";
    // 
    // button3
    // 
    this.button3.Location = new System.Drawing.Point(480, 8);
    this.button3.Name = "button3";
    this.button3.Size = new System.Drawing.Size(71, 23);
    this.button3.TabIndex = 5;
    this.button3.Text = "语法分析";
    this.button3.UseVisualStyleBackColor = true;
    this.button3.Click += new System.EventHandler(this.button3_Click);
    // 
    // richTextBox3
    // 
    this.richTextBox3.Location = new System.Drawing.Point(408, 48);
    this.richTextBox3.Name = "richTextBox3";
    this.richTextBox3.Size = new System.Drawing.Size(195, 352);
    this.richTextBox3.TabIndex = 6;
    this.richTextBox3.Text = "";
    // 
    // label1
    // 
    this.label1.AutoSize = true;
    this.label1.Location = new System.Drawing.Point(422, 412);
    this.label1.Name = "label1";
    this.label1.Size = new System.Drawing.Size(41, 12);
    this.label1.TabIndex = 7;
    this.label1.Text = "label1";
    // 
    // Form1
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
    this.ClientSize = new System.Drawing.Size(625, 436);
    this.Controls.Add(this.label1);
    this.Controls.Add(this.richTextBox3);
    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.MaximizeBox = false;
    this.Name = "Form1";
    this.Text = "分析器";
    this.ResumeLayout(false);
    this.PerformLayout();

} 
#endregion 

/// <summary> 
/// 应用程序的主入口点。 
/// </summary> 
[STAThread] 
static void Main() 
{ 
Application.Run(new Form1()); 
} 
/// <summary> 
/// 词法分析函数 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
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); 

} 
/// <summary> 
/// 输出结果　即用于输出二 维数组。 
/// </summary> 
/// <param name="twoStringArray"></param> 
private void printString(string[,] twoStringArray) 
{ 
//提示说明 
this.richTextBox2.Text ="1 -> 关键字" + "\r\n" + 
"2 -> 运算符" + "\r\n" + 
"3 -> 分隔符" + "\r\n" + 
"4 -> 数字 " + "\r\n" + 
"5 -> 其它" + "\r\n"+
"============================" + "\r\n";
//输出二维数组中的数据 
for(int x=0;x<twoStringArray.Length/2;x++) 
{ 
for(int y=0;y<2;y++) 
{ 
this.richTextBox2.Text = this.richTextBox2.Text + twoStringArray[y,x] + " "; 
if( y == 1) 
{ 
this.richTextBox2.Text = this.richTextBox2.Text + "\r\n"; 
} 
} 
} 
} 

/// <summary> 
/// 打开方件 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
private void button2_Click(object sender, System.EventArgs e)// 文件打开的方法。 
{ 
openFileDialog1.Filter = "文本文件(*.txt)|*.txt"; 
openFileDialog1.Title = "打开要分析的源文件。"; 

if(openFileDialog1.ShowDialog() == DialogResult.OK) 
{ 
System.IO.StreamReader sr = new 
System.IO.StreamReader(openFileDialog1.FileName); 
this.richTextBox1.Text = sr.ReadToEnd(); 
sr.Close(); 
} 
} 
/// <summary> 
/// 保存文件　 
/// </summary> 
/// <param name="sender"></param> 
/// <param name="e"></param> 
//private void button3_Click(object sender, System.EventArgs e) 
//{ 
//saveFileDialog1.Filter = "文本文件(*.txt)|*.txt"; 
//saveFileDialog1.Title = "保存分析结果."; 
//if(saveFileDialog1.ShowDialog() == DialogResult.OK) 
//{ 
//System.IO.StreamWriter wr = new 
//System.IO.StreamWriter(saveFileDialog1.FileName); 
//wr.Write(this.richTextBox2.Text); 
//wr.Close(); 
//} 
//} 

/// <summary> 
/// 引用二维数组和单词的标志j 
/// </summary> 
/// <param name="twoArray"></param> 
/// <param name="j"></param> 
private void oneArrayToTwo(ref string[,] twoArray,ref int j) 
{ 

string[,] tempArray = twoArray; 
twoArray = new string[2,j+2]; 
for(int x=0;x<2;x++) 
{ 
for(int y=0;y<j+1;y++) 
{ 
twoArray[x,y] = tempArray[x,y]; 
} 
} 
j=j+1; 
} 
/// <summary> 
/// 引用单词数组，和要加入单词数组的单词 
/// </summary> 
/// <param name="stringArrange"></param> 
/// <param name="st"></param> 
private void stringToArrayString(ref string[] stringArrange, string st) 
{ 

if(stringArrange[0] =="") 
{ 
stringArrange[0] = st; 
} 
else 
{ 
string[] oldA = stringArrange;//刚得到的字符串 
int i=oldA.Length +1; 
stringArrange = new string[i];//申请一个长一个的字符数组。 
oldA.CopyTo(stringArrange,0);//将先前的字符数组考到现在这个数组中。 
stringArrange[stringArrange.Length -1] = st; 
} 
} 
/// <summary> 
/// 将Text中的字符串，存入一个字符数组中。 
/// </summary> 
/// <returns></returns> 
private char[] textToCharArray() 
{ 
string stringTemp; 
stringTemp = this.richTextBox1.Text; 
char[] getch = stringTemp.ToCharArray();//要处理的字符都在getch这个数组中。 
return getch; 
} 
/// <summary> 
/// 字符数组 到 单词数组 
/// </summary> 
/// <param name="getch"></param> 
/// <returns></returns> 
private 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。 
{ 
string[] stringArrange={""} ;//用这个字符串数组存放词法分析后得到的单词。 
char charTemp; 
string stringSave = "";// 存放一个分析得到的单词 

//一次循环因得到一个单词。 
for(int i = 0;i < getch.Length;i++) 
{ 
charTemp = getch[i]; 

//由字母开头　数字和字母组成的单词。 
if( charTemp >= 'a'&& 
charTemp <= 'z' 
|| 
charTemp >= 'A' && 
charTemp <= 'Z'
    ) 
{ 
stringSave = charTemp.ToString(); 
i = i + 1; 
int test = 0;//判断循环是否结束，1　为结束。 
while(test == 0) 
{ 
charTemp = getch[i]; 
if( charTemp >= 'a'&& 
charTemp <= 'z' 
|| 
charTemp >= 'A' && 
charTemp <= 'Z'
|| 
charTemp >= '0' && 
charTemp <= '9') 
{ 
stringSave = stringSave + charTemp.ToString(); 
i = i + 1; 
} 
else 
test = 1; 
} 
stringToArrayString(ref stringArrange,stringSave); 
} 
stringSave = ""; 
//由数字组成的单词。 
if( charTemp >= '0' && 
charTemp <= '9') 
{ 
stringSave = stringSave + charTemp.ToString(); 
i = i + 1; 
int test1 = 0; 
while(test1 == 0) 
{ 
charTemp = getch[i]; 
if( charTemp >= '0' && 
charTemp <= '9') 
{ 
stringSave = stringSave + charTemp.ToString(); 
i = i + 1; 
} 
else 
test1 = 1; 
} 
stringToArrayString(ref stringArrange,stringSave); 
} 
stringSave = ""; 
//由运算符组成的单词。 
if( charTemp == '+'
|| charTemp == '-' 
|| charTemp == '*' 
|| charTemp == '/' 
|| charTemp == '='
|| charTemp == '<'
|| charTemp == '>'
|| charTemp == '!') 
{ 
stringSave = stringSave + charTemp.ToString(); 
i = i + 1; 
int test2 = 0; 
while(test2 == 0) 
{ 
charTemp = getch[i]; 
if( charTemp == '+' 
|| charTemp == '-' 
|| charTemp == '*' 
|| charTemp == '/' 
|| charTemp == '=' 
|| charTemp == '<'
|| charTemp == '>'
|| charTemp == '!') 
{ 
stringSave = stringSave + charTemp.ToString(); 
i = i + 1; 
} 
else 
test2 = 1; 
} 
stringToArrayString(ref stringArrange,stringSave); 
} 
stringSave = ""; 
//由介符组成的单词。 
if( charTemp == '('
||charTemp == ')' 
||charTemp == '{' 
||charTemp == '}'
||charTemp == '[' 
||charTemp == ']' 
||charTemp == ',' 
||charTemp == ':' 
||charTemp == ';' 


||charTemp == '\\') 
{ 
stringSave = stringSave + charTemp.ToString(); 
stringToArrayString(ref stringArrange,stringSave); 
} 
} 
return stringArrange; 
} 
/// <summary> 
/// 单词数组 到 二维单词数组。 
/// </summary> 
/// <param name="stringArray"></param> 
/// <returns></returns> 
private string[,] stringArrayToTwoStringArray(string[] stringArray) 
{ 
//存放单词标识后的结果。 
string [,] twoArray = new string[2,1]; 
//单词的标志 
int j=0; 
/*
Const(常数)  Dim(定义) As(为) Mod(取模)  

And(并且)   Or(或者）   Not(非) 

If (如果)  Then(那么)   Else(否则) 

Stop(停止) End(结束) 

Select(选择)  Case(条件) Is (是) 

For(计数)   To(到)    Step(步长)   

Byref(传址)  Byval(传值) 

Sub(子程序) Function(函数)  Exit(退出)   

Do(做)  Loop(循环)   Until(除非)  While(当)  Wend(当结束)  

Let(让) Call(调用)