type.java

来自「用java实现的编译器. 包括语法分析」· Java 代码 · 共 30 行

package symbols; 
import lexer.*; 
public class Type extends Word {
	public int width = 0;
	public Type(String s, int tag, int w) {
		super(s, tag);
		width = w;
	}
	public static final Type
			Int = new Type("int", Tag.BASIC, 4),
	 	   	Float = new Type("float", Tag.BASIC, 8),
		    	Char = new Type("char", Tag.BASIC, 1),
		    	Bool = new Type("bool", Tag.BASIC, 1);
	public static boolean numeric(Type p) {
		if(p == Type.Char || p == Type.Int || p == Type.Float)
			return true;
		else 	return false;
	}
	public static Type max(Type p1, Type p2) {
		if(!numeric(p1) || !numeric(p2))
			return null;
		else if(p1 == Type.Float || p2 == Type.Float)
			return Type.Float;
		else if(p1 == Type.Int || p2 == Type.Int)
			return Type.Int;
		else	return Type.Char;

	}
}