simplewhitespace.java

JAVA在编译原理上的应用。

package lolo.scans;

/** Instances of this class scan for one or more characters from ASCII <tt>0x00</tt> - <tt>0x20</tt>.
 * <p>By default these symbols will be ignored.
 *
 * @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 SimpleWhitespace extends Scan {
    /** Sets <tt>ignore</tt> to <tt>true</tt>.
     *
     * @see lolo.Scan#ignore
     */
    {
        ignore = true;
    }
    
    public void reset() {}
    
    /** Returns whether <tt>ch</tt> is a whitespace character.
     *
     * @return whether <tt>ch</tt> is a whitespace character.
     */
    protected boolean isWhitespace(char ch) {
        return ' ' >= ch;
    }
    
    public State nextChar(char ch) {
        boolean b = isWhitespace(ch);
        return stateObject.set(b, b);
    }
}