symboltable.java

编译器

package compiler;

import java.util.Vector;

public class SymbolTable 
{
	Vector<String> type;//val为变量,const为常量
	Vector<String> name;
	Vector<Integer> value;
	
	public SymbolTable()
	{
		type = new Vector<String>();
		name = new Vector<String>();
		value = new Vector<Integer>();
	}
	public void addItem(int index , String t , String n , int v)
	{
		type.add(index,t);
		name.add(index,n);
		value.add(index,v);
	}
	
	//返回某个变量或常量在符号表中的位置
	public int findIndexByName(String n)
	{
		return name.indexOf(n);
	}
    
	//返回某个变量或常量的值
	public int findValueByName(String n)
	{
		int index = 0;
		index = name.indexOf(n);
		return value.elementAt(index);
	}
	
	public boolean contains(String n)
	{
		if(name.contains(n))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
}