/*****************************************************/
/*          This java file is a part of the          */
/*                                                   */
/*           -  Plouf's Java IRC Client  -           */
/*                                                   */
/*   Copyright (C)  2002 - 2004 Philippe Detournay   */
/*                                                   */
/*         All contacts : theplouf@yahoo.com         */
/*                                                   */
/*  PJIRC is free software; you can redistribute     */
/*  it and/or modify it under the terms of the GNU   */
/*  General Public License as published by the       */
/*  Free Software Foundation; version 2 or later of  */
/*  the License.                                     */
/*                                                   */
/*  PJIRC is distributed in the hope that it will    */
/*  be useful, but WITHOUT ANY WARRANTY; without     */
/*  even the implied warranty of MERCHANTABILITY or  */
/*  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   */
/*  General Public License for more details.         */
/*                                                   */
/*  You should have received a copy of the GNU       */
/*  General Public License along with PJIRC; if      */
/*  not, write to the Free Software Foundation,      */
/*  Inc., 59 Temple Place, Suite 330, Boston,        */
/*  MA  02111-1307  USA                              */
/*                                                   */
/*****************************************************/

package irc.style;

/**
 * The URLRecognizer.
 */
public class URLRecognizer implements WordRecognizer {
	private boolean isAlpha(String s) {
		s = s.toLowerCase(java.util.Locale.ENGLISH);
		for (int i = 0; i < s.length(); i++)
			if ((s.charAt(i) < 'a') || (s.charAt(i) > 'z'))
				return false;
		return true;
	}

	@Override
	public boolean recognize(String word) {
		if (word.startsWith("http://"))
			return true;
		if (word.startsWith("ftp://"))
			return true;
		if (word.startsWith("www."))
			return true;
		if (word.startsWith("ftp."))
			return true;
		int a = word.indexOf('.');
		if (a == -1)
			return false;
		int b = word.lastIndexOf('.');
		if (a == b)
			return false;
		String ext = word.substring(b + 1);
		if (!isAlpha(ext))
			return false;
		if ((ext.length() == 2) || (ext.length() == 3))
			return true;
		return false;
	}

	@Override
	public String getType() {
		return "url";
	}

}