arith.java

用java实现的编译器. 包括语法分析

package inter;
import lexer.*;
import symbols.*;
public class Arith extends Op {
	public Expr expr1, expr2;
	public Arith(Token tok, Expr x1, Expr x2) {
		super(tok, null);
		expr1 = x1;
		expr2 = x2;
		type = Type.max(expr1.type, expr2.type);
		if(type == null)
			error("type error");	
	}
	public Expr gen() {
		return new Arith(op, expr1.reduce(), expr2.reduce());
	}
	public String toString() {
		return expr1.toString() + " " + op.toString() + " " + expr2.toString();
	}
}