70c7ca73a64d001a101ed6a24c807b69

这只是我做课程设计的时候做的一个小的分析器 希望对你们有用

import  java.awt.*;
import  java.awt.event.*;
public class analyse 
{
	static TextArea t1=new TextArea();
  static TextArea t2=new TextArea();
 static String save[]={"program","type","var","procedure","begin","end","array","of"
		,"record","if","then","else","fi","while","do","endwh","read","write","return",
		"integer","char"};
 static String fj[]={"+","-","*","/","(",")",".","[","]",";",":",",","<","=","{","}"};
 static String message[]={"PLUS","MINUS","TIMES","OVER","LPAREN","RPAREN","DOT","LMIDPAREN","RMIDPAREN","SEMI","COLON","COMMA","LT","EQ","ENDFILE"};
 
public static void main(String[] args)
{
	 analyse a1=new analyse();
	  Frame f=new Frame();
	  Button b=new Button("词法分析");	 
Panel p1=new Panel();
Panel p2=new Panel();
//  TextArea t1=new TextArea();
// TextArea t2=new TextArea();
f.setLayout(new BorderLayout());
f.add("North",p1);
f.add("Center",p2);
f.addWindowListener(new wla());

p1.setLayout(new GridLayout(1,2));
p2.setLayout(new GridLayout(1,2));
p1.add(b);
p2.add(t1);
//analyse.t1.setText("请输入SNL");
p2.add(t2);


b.addActionListener(new ActionListener()
		{
	    String ha=new String();
	    String h=new String();
	    int n=0;   //判断位
	  //  Node no=new Node();
	    tklist tk=new tklist();
	    idlist id=new idlist();
		 public void actionPerformed(ActionEvent e)
		{
	      ha=t1.getText(); 
			 
        for(int i=0;i<ha.length();i++)
        {
        	switch (ha.charAt(i))
        	{
        		case ' ':
        		h=ha.substring(n,i);
        		n=i;
        		for(int i1=0;i1<save.length;i1++)
        		{
        			if(h.equals(save[i1]))
        			{
        				
        			tk.insert(tk);
        			tk.zl=1;
        			tk.wz=i1;
        	//		t2.setText(""+tk.zl+tk.wz);
        			}
        			else 
        			{
        			id.insert(id);
        			id.c=h;
        			}
           		}
              	break;
              	
        		case '\n':
        			++tk.line;
        			h=ha.substring(n,i-1);
                   for(int i1=0;i1<fj.length;i1++)
                   {
                	   if(h.equals(fj[i1]))
                		   break;
                   }
                   for(int i1=0;i1<save.length;i1++)            	 
                	   {
                	  if(h.equals(save[i1]))             	   
                		   {
                	 tk.insert(tk);
                     ++tk.line;
                     tk.zl=1;
                     tk.wz=i1;
                		   }
                	  else if(!h.equals(save[i1])&&i1==(save.length-1))
                   	   id.insert(id);        
                   	   id.c=h; 
                   	   t2.setText(""+tk.line);
                	   }
                   
                   
        	     break;
        	}
        	
        }
		}
	});
f.setSize(200,160);
f.setVisible(true);
}
}


 class Node
{
 Object data;
 Node next;
 
 Node(Object d) 
{ 
  data=d; 
  next=null; 
}
}
 
 class Nodelist 
{
	private Node Head=null; 
	private Node Tail=null; 
	private Node Pointer=null; 
	private int Length=0; 

private Node cursor()//获取当前结点
{
if(Head==null) 
throw new java.lang.NullPointerException(); 
else if(Pointer==null) 
return Head; 
else 
return Pointer.next; 
} 

public void insert(Object d)
{
Node e=new Node(d); 
if(Length==0) 
{
	Head=e;
	Tail=e;  
}
else
{
Node temp=cursor();
e.next=temp;
if(Pointer==null)
Head=e; 
else
   Pointer.next=e;
} 
    Length++;
} 	
}
 
class tklist extends Nodelist
{
	int line=1;
	int zl=0;
	int wz=0;
/*	
tklist(Object d)
{
line=0;
zl=0;
wz=0;
}*/
}

class idlist extends Nodelist
{
String c;	
}

class wla extends WindowAdapter
{
	public void windowClosing(WindowEvent e)
    {
	System.exit(1);
	}
}