class.ilICalWriter.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program 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; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program 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 this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/

class ilICalWriter
{
        const LINEBREAK = "\r\n";
        #const LINEBREAK = '<br />';
        const LINE_SIZE = 75;
        const BEGIN_LINE_WHITESPACE = ' ';
        
        private $ical = '';
        
        public function __construct()
        {
                $this->ical = '';
        }
        
        public static function escapeText($a_text)
        {
                return preg_replace(
                        array(
                                '/\\\r\\\n/',
                                '/\\\/',
                                '/;/',
                                '/,/',
                                '/\\\n/',
                                '/\\\N/'
                                ),
                        array(
                                '\\r\\n',
                                '\\',
                                '\;',
                                '\,',
                                '\\n',
                                '\\N'
                                ),
                                $a_text
                        );
        }
        
        public function addLine($a_line)
        {
                //$chunks = str_split($a_line, self::LINE_SIZE);

                include_once './Services/Utilities/classes/class.ilStr.php';

                // use multibyte split
                $chunks = array();
                $len = ilStr::strLen($a_line);
                while($len)
                {
                        $chunks[] = ilStr::subStr($a_line,0,self::LINE_SIZE);
                        $a_line = ilStr::subStr($a_line, self::LINE_SIZE, $len);
                        $len = ilStr::strLen($a_line);
                }

                for($i = 0; $i < count($chunks); $i++)
                {
                        $this->ical .= $chunks[$i];
                        if(isset($chunks[$i+1]))
                        {
                                $this->ical .= self::LINEBREAK;
                                $this->ical .= self::BEGIN_LINE_WHITESPACE;
                        }
                }
                $this->ical .= self::LINEBREAK;
        }
        
        public function __toString()
        {
                return $this->ical;
        }
}