📄 newpro.java
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import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class Newpro extends JFrame implements ActionListener
{
public static void main(String[] args) {
Newpro frame=new Newpro();
}
JButton bu1;
JTextArea ta1;
JTextArea ta2;
Scrollbar sb1;
String Keyword[]={"char","short","int","unsigned","long",
"float","double","struct","union","void ",
"enum","signed","const","volatile","typedef",
"auto","register","static","extem","break",
"extem ","break","case ","continue","default",
"do","while","else","for","goto","if",
"return","switch","while","sizeof"};
String D[]={"E","e","T","t","F"};
String O[]={"i","+","*","(",")","$"} ;
String DO[][]= {{"Te","Q","Q","Te","Q","Q"},
{"Q","+Te","Q","Q","&","&"},
{"Ft","Q","Q","Ft","Q","Q"},
{"Q","&","*Ft","Q","&","&"},
{"i","Q","Q","(E)","Q","Q"}};
public Newpro(){
super("新建的文件集");
Container C = getContentPane();
C.setLayout(new BorderLayout());
bu1= new JButton("确定");
bu1.setLocation(150,50);
bu1.addActionListener(this);
C.add("North",bu1);
ta1=new JTextArea();
ta1.setSize(300,250);
ta1.setLocation(20,50);
C.add("Center",ta1);
JPanel pan1 = new JPanel();
pan1.setLayout(new BorderLayout());
C.add("East",pan1);
ta2=new JTextArea();
ta2.setSize(300,250);
ta2.setLocation(20,50);
sb1=new Scrollbar(Scrollbar.VERTICAL, 1, 1, 0, 25);
ta1.add(sb1);
sb1.setMinimum(0);
pan1.add("Center",ta2);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600,500);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
char buffer[]= new char[2048];
FileReader rd1;
String str1="";
ta1.setText("");
try{
rd1 = new FileReader("432.txt");
int len1 = rd1.read(buffer);
rd1.close();
str1=new String(buffer,0,len1);
ta1.setText(str1);
accidence();
}catch(IOException e1)
{return
;
}
}
int yugaochao(String s) // 保留字
{
int key;
int i;
for(i=0;i<35;i++)
{
if(s.equals(Keyword[i]))
{ key=5;
return key;
}
}
key=8;
return key;
}
void accidence()
{
int i=0;
int j;
int key;
int num1;
String str2 = new String();
String str3 = new String();
String str4 = new String();
str2=ta1.getText();
str4 = str2;
ta2.setText("");
StringTokenizer tk1=new StringTokenizer(str2,"' ','(',')','\n','\r','+','*'");
num1=0;
while (tk1.hasMoreTokens())
{
i++;
str3 = tk1.nextToken();
j=analyze(str3);
str4=str4.replaceAll(str3,"i");
key=j;
if((key==2)||(key==4)||(key==7)||(key==8))
;
else num1=1;
if(key==0)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"这什么都不是");
else if(key==1)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"求余");
else if (key==2)
ta2.setText(ta2.getText()+"\n"+str3+"是"+"这是数字（整数)");
else if(key==3)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"这是分隔符");
else if (key==4)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"数字(浮点数) ");
else if (key==5)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"这是保留字");
else if (key==6)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"????????");
else if (key==7)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"数字呢！(科学记数发的数值)");
else if (key==8)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"标志符");
else if (key==9)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"特殊字符！");
else if (key==10)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"减号");
else if (key==11)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"加号");
else if (key==12)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"乘号");
else if (key==13)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"除号");
else if (key==14)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"附值符号");
else if (key==15)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"等号");
else if(key==16)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"小于");
else if (key==17)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"小于等于");
}
else if (key==18)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"大于");
}
else if (key==19)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"大于等于");
}
else if (key==20)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"逻辑与");
}
else if (key==21)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"逻辑或");
}
else if (key==22)
{ta2.setText(ta2.getText()+"\n"+str3+" 是"+"逻辑非");
}
else if (key==101)
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"非法的字符！");
else
ta2.setText(ta2.getText()+"\n"+str3+" 是"+"这是错误的，请重新输入一下！");
}
if(num1==0)
syntax(str4);
else ta1.setText(ta1.getText()+"\n\n"+"读入的文件含有非法的字符");
}
int analyze(String s)
{
char ch;
int STATE ;
int key = 101;
int i = 0;
int Accept = 100;
int Erro = 101;
int j = s.length();
STATE = 0;
if(j==0)
return 0;
while(STATE!=Accept){
if(((i==j)&&((STATE==2)||(STATE==4)||(STATE==5)||(STATE==7)||(STATE==8)||(STATE==9)||(STATE==10)))||STATE==Erro)
{
key=STATE;
if(STATE==8)
{key=yugaochao(s);
}
STATE=Accept;
return key;
}
ch=s.charAt(i);
i++;
switch(STATE)
{
case 0:
if(ch=='-'||ch=='+')
{ STATE=1;
if((i==j)&&(ch=='-'))
return 10;
if((i==j)&&(ch=='+'))
return 11;
}
else if (Character.isDigit(ch))
{STATE=2;
}
else if (Character.isLetter(ch))
STATE=8;
else if (ch=='*'&&i==j)
return 12;
else if(((ch==' ')||(ch=='\t')||(ch=='\n'))&&(i!=j))
STATE=0;
else if (ch=='/'&&i==j)
return 13;
else if (ch=='='&&i==j)
return 14;
else if(ch=='='&&i!=j)
STATE= 9;
else if (ch=='%'&&i==j)
{return 1;
}
else if (ch=='<'&&i==j)
{return 16;
}
else if (ch=='<'&&i!=j)
{STATE= 10;
}
else if (ch=='>'&&i==j)
{return 18;
}
else if (ch=='>'&&i!=j)
{STATE =11;
}
else if((ch=='&')&&(i!=j))
STATE=12;
else if ((ch=='|')&&(i!=j))
{STATE=13;
}
else if (ch=='!'&&i==j)
{return 22;
}
else if (((ch==';')||(ch ==' ')||(ch==','))&&i==j)
{return 3;
}
else
STATE=Erro;break;
case 1:
if(Character.isDigit(ch))
STATE=2;
else
STATE=Erro;break;
case 2:
if(Character.isDigit(ch))
STATE=2;
else if (ch=='E'||ch=='e')
{STATE=5;
}
else if(ch=='.')
{ STATE=3;
if(i==j)
STATE=Erro;
}
else
STATE=Erro;
break;
case 3:
if(Character.isDigit(ch))
STATE=4;
else
STATE=Erro;
break;
case 4:
if(Character.isDigit(ch))
STATE=4;
else if (ch=='E'||ch=='e')
{ STATE=5;
}
else
STATE=Erro;
break;
case 5:
if (ch=='+'||ch=='-')
{STATE=6;
}
else if(Character.isDigit(ch))
STATE=7;
else
STATE=Erro;
break;
case 6:
if(Character.isDigit(ch))
STATE=7;
else
STATE=Erro;
break;
case 7:
if(Character.isDigit(ch))
STATE=7;
else
STATE=Erro;
break;
case 8:
if(Character.isLetter(ch)||Character.isDigit(ch))
STATE=8;
else
STATE=Erro;
break;
case 9:
if(ch=='='&&i==j)
return 15;
else
STATE=Erro;
break;
case 10:
if(ch=='='&&i==j)
return 17;
else STATE =Erro;
break;
case 11:
if(ch=='='&&i==j)
return 19;
else STATE = Erro;
break;
case 12:
if(ch=='&'&&i==j)
return 20;
else
STATE=Erro;
case 13:
if(ch=='|'&&i==j)
return 21;
else STATE=Erro;
case 101:
i=j;
break;
default:
STATE=Erro;
}
}
return key;
}
void syntax(String yugaochao)
{
int i=0;
int j=yugaochao.length();
String X;
int keydo,keyto,key;
String a;
Stack Xo=new Stack();
Stack To=new Stack();
Xo.push("$");
Xo.push("$");
Xo.push("E");
To.push("$");
To.push("$");
keydo=0;
keyto=0;
for(i=j-1;i>=0;i--)
{ String go=yugaochao.substring(i,i+1);
To.push(go);
}
ta1.setText(ta1.getText()+"\n"+" "+Xo+" "+To+" ");
ta2.setText(ta2.getText()+"\n\n"+"化简的结果"+"\n"+yugaochao);
do{
X=(String)Xo.peek();
a=(String)To.peek();
if(X.equals("i")||X.equals("+")||X.equals("*")||X.equals("(")||X.equals(")")||X.equals("$"))
{
if(X.equals(a))
{Xo.pop();
To.pop();
a=(String)To.peek();
ta1.setText(ta1.getText()+"\n"+" "+Xo+" "+To+" ");
//System.out.println(X);
}
else {
System.out.println("error");
break;
}
}
else {
for(i=0;i<5;i++)
{
if(X.equals(D[i]))
{ keydo=i;
}
}
for(i=0;i<6;i++)
{if(a.equals(O[i]))
{keyto=i;
}
}
if(!DO[keydo][keyto].equals("Q"))
{
Xo.pop();
key=DO[keydo][keyto].length();
if(!X.equals("&"))
{for(i=key;i>0;--i)
{ Xo.push(DO[keydo][keyto].substring(i-1,i));
}
ta1.setText(ta1.getText()+"\n"+" "+Xo+" "+To+" "+X+"------>"+DO[keydo][keyto]);
}
}
else
{
ta1.setText(ta1.getText()+"\n"+"匹配错误");
System.out.println("匹配错误");
break;
}
}
}while(!X.equals("$"));
}
}⌨️ 快捷键说明
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