variable.java

c--词法分析

import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;
import java.util.HashMap;
import java.util.Vector;
import java.util.Map;

public class Variable{
	public String name;
	public String type;
	public String mode;
	public Boolean initiated;
    public Boolean read_only=false;
	public Integer value;
	public int[] values;
    public int num;
    public int length;
	

	public Variable(String n, String t, int mnum){
		name=n;
		type=t;
		mode="scalar";
		initiated=false;
        num=mnum;
	}

	public Variable(String n, String t, int mnum, boolean ro){
	    this(n,t,mnum);	
        read_only=ro;
    }

	public Variable(String n, String t, Integer size, int mnum){
		name=n;
		type=t;
		mode="array";
		values=new int[size];
		initiated=true;
        num=mnum;
        length=size;
	}
	public int get_value(){

		if (initiated){
			return value;
		}else{
			Main.print_err("Uninitialized variable '"+name+"'");
			return -1;
		}
	}
	public int get_value(Integer i){
		return values[i];
	}
	public void force_set_value(Integer v){
		value=v;
		initiated=true;
	}
	public void set_value(Integer v){
        if(read_only){
            Main.print_err("Tried to assign to a read only variable '"+name+"'");
        }
        force_set_value(v);
	}
	public void set_value(Integer v, Integer i){
		values[i]=v;
	}
}