/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.functions.other;

import lucee.runtime.PageContext;
import lucee.runtime.ext.function.Function;

/**
 * Implements the CFML Function xmlformat
 */
public final class XMLFormat implements Function {
    public static String call(PageContext pc, String xmlString) {
	int len = xmlString.length();
	int plus = 0;

	for (int pos = 0; pos < len; pos++) {
	    char chr = xmlString.charAt(pos);
	    switch (chr) {
	    case '<':
		plus += 3;
		break;
	    case '>':
		plus += 3;
		break;
	    case '&':
		plus += 4;
		break;
	    case '"':
		plus += 5;
		break;
	    case '\'':
		plus += 5;
		break;
	    }
	}
	if (plus == 0) return xmlString;

	char[] chars = new char[len + plus];
	int count = 0;

	for (int pos = 0; pos < len; pos++) {
	    char chr = xmlString.charAt(pos);
	    switch (chr) {
	    case '<':
		chars[count++] = '&';
		chars[count++] = 'l';
		chars[count++] = 't';
		chars[count++] = ';';
		break;
	    case '>':
		chars[count++] = '&';
		chars[count++] = 'g';
		chars[count++] = 't';
		chars[count++] = ';';
		break;
	    case '&':
		chars[count++] = '&';
		chars[count++] = 'a';
		chars[count++] = 'm';
		chars[count++] = 'p';
		chars[count++] = ';';
		break;
	    case '"':
		chars[count++] = '&';
		chars[count++] = 'q';
		chars[count++] = 'u';
		chars[count++] = 'o';
		chars[count++] = 't';
		chars[count++] = ';';
		break;
	    case '\'':
		chars[count++] = '&';
		chars[count++] = 'a';
		chars[count++] = 'p';
		chars[count++] = 'o';
		chars[count++] = 's';
		chars[count++] = ';';
		break;
	    default:
		chars[count++] = chr;
		break;
	    }
	}

	// if(start<len)sb.append(xmlString.substring(start,len));
	return new String(chars);
    }

}