lrstack.java

LR法FOR语句的循环

package com;
import java.util.*;

class LRStack {
	public Stack<Integer> state = new Stack<Integer>();
	public Stack<String> symbol = new Stack<String>();
	public LRStack()
	{
		state.push(0);
		symbol.push("#");
		
	}
	public void pushState(int a)
	{
		state.push(a);
	}
    public void pushSymbol(String c)
    {  
    	symbol.push(c);
    }
    public void pop(int len)
    {
    	for(int i = 0;i < len;i++)
    	{
    		state.pop();
    		symbol.pop();
    		
    	}
    }
    public int peekState()
    {
    	return  state.peek();
    	 
    }
    public String peekSymbol()
    {
    	return  symbol.peek();
    	
    }
   
    
    	
    
	
	
}