analyzestack.java

编译器

package compiler;

import java.util.Vector;

public class AnalyzeStack 
{
	public static Vector<Integer> state;
	public static Vector<Integer> symbol;
	public static int statop;
	public static int symtop;
	
	public AnalyzeStack()
	{
		state = new Vector<Integer>();
		symbol = new Vector<Integer>();
		state.add(0);
		symbol.add(18);
		statop = 1;
		symtop = 1;
	}
	
	//////////////对状态栈的操作//////////////////////
	public int getState()
	{
		return state.get(statop-1);
	}
	public void pushState(int sta)
	{
		state.add(sta);
		statop++;
	}
	public int popState()
	{
		int x;
		x = state.remove(--statop);
		return x;
	}
	
    //////////////对符号栈的操作//////////////////////
	public int getSymbol()
	{
		return symbol.get(symtop-1);
	}
	public void pushSymbol(int sym)
	{
		symbol.add(sym);
		symtop++;
	}
	public int popSymbol()
	{
		int x;
		x = symbol.remove(--symtop);
		return x;
	}
}