char.java

来自「JAVA在编译原理上的应用。」· Java 代码 · 共 30 行

package lolo.scans;

/** A simple class to scan a single character.
 *
 * @author <a href="http://www.inf.uos.de/bernd" target="_blank">Bernd K&uuml;hl</a>
           (<a href="mailto:[e-mail]">[e-mail]</a>)
 */
public class Char extends Set {
    /** Creates an object which accepts any character. */
    public Char() {
        super("", false);
    }
    
    /** Creates an object which scans for the character <tt>ch</tt>.
     *
     * @param ch the character of this symbol.
     */
    public Char(char ch) {
        super(ch+"", true);
    }
    
    /** Returns a string representation of the object.
     *
     * @return a string representation of the object.
     */
    public String toString() {
        return getClass().getName()+"["+(set.length() == 0 ? "ANY" : set)+"]";
    }
}