unary.java

用java实现的编译器. 包括语法分析

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

	}
}