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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;
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;
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.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
/// <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 -> 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<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 == "
||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;
//每循环一次，把一个单词归于一类，即前面加上一个数字。
for(int i=0;i<stringarray.length;i++)
{
//保留字 1
if( stringarray[i] == "main"
|| stringarray[i] == "int"
|| stringarray[i] == "float"
|| stringarray[i] == "printf"
|| stringarray[i] == "if"
|| stringarray[i] == "for"
|| stringarray[i] == "while"
|| stringarray[i] == "do"
|| stringarray[i] == "return"
|| stringarray[i] == "break"
|| stringarray[i] == "continue")
{
twoarray[0,j] = "1";
twoarray[1,j] = stringarray[i];
this.onearraytotwo(ref twoarray,ref j);
}
//运算符 2
else
if( stringarray[i] == "+"
|| stringarray[i] == "-"
|| stringarray[i] == "*"
|| stringarray[i] == "/"
|| stringarray[i] == ">"
|| stringarray[i] == "<"
|| stringarray[i] == ">="
|| stringarray[i] == "<="
|| stringarray[i] == "!="
|| stringarray[i] == "=="
|| stringarray[i] == "++"
|| stringarray[i] == "–"
|| stringarray[i] == "=")
{
twoarray[0,j] = "2";
twoarray[1,j] = stringarray[i];
this.onearraytotwo(ref twoarray,ref j);
}
//分隔符 3
else
if( stringarray[i] == "("
|| stringarray[i] == ")"
|| stringarray[i] == "{"
|| stringarray[i] == "}"
|| stringarray[i] == "["
|| stringarray[i] == "]"
|| stringarray[i] == ","
|| stringarray[i] == ";"
|| stringarray[i] == ":"
|| stringarray[i] == "\""
|| stringarray[i] == "/*"
|| stringarray[i] == "*/")
{
twoarray[0,j] = "3";
twoarray[1,j] = stringarray[i];
this.onearraytotwo(ref twoarray,ref j);
}
//数字 4
else
if( stringarray[i].tochararray()[0] >=0 &&
stringarray[i].tochararray()[0] <= 9)
{
twoarray[0,j] = "4";//数字
twoarray[1,j] = stringarray[i];
this.onearraytotwo(ref twoarray,ref j);
}
//其它 5(变量等)
else
{
twoarray[0,j] = "5";
twoarray[1,j] = stringarray[i];
this.onearraytotwo(ref twoarray,ref j);
}
}
return twoarray;
}
}
}
