iCalcreator.class.php

<?php
/*********************************************************************************/
/**
 * iCalcreator class v2.6
 * copyright (c) 2007-2008 Kjell-Inge Gustafsson kigkonsult
 * www.kigkonsult.se/iCalcreator/index.php
 * ical@kigkonsult.se
 *
 * Description:
 * This file is a PHP implementation of RFC 2445.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
/*********************************************************************************/
/*********************************************************************************/
/*         A little setup                                                        */
/*********************************************************************************/
            /* your local language code */
// define( 'ICAL_LANG', 'sv' );
            // alt. autosetting
/*
$langstr     = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
$pos         = strpos( $langstr, ';' );
if ($pos   !== false) {
  $langstr   = substr( $langstr, 0, $pos );
  $pos       = strpos( $langstr, ',' );
  if ($pos !== false) {
    $pos     = strpos( $langstr, ',' );
    $langstr = substr( $langstr, 0, $pos );
  }
  define( 'ICAL_LANG', $langstr );
}
*/
            /* only for phpversion 5.x, date management, default timezone setting */
if( substr( phpversion(), 0, 1) >= '5' ) // && ( 'UTC' == date_default_timezone_get() )) {
  date_default_timezone_set( 'Europe/Stockholm' );
            /* version string, do NOT remove!! */
define( 'ICALCREATOR_VERSION', 'iCalcreator 2.6' );
/*********************************************************************************/
/*********************************************************************************/
/**
 * vcalendar class
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.13 - 2007-12-30
 */
class vcalendar {
            //  calendar property variables
  var $calscale;
  var $method;
  var $prodid;
  var $version;
  var $xprop;
            //  container for calendar components
  var $components;
            //  component config variables
  var $allowEmpty;
  var $unique_id;
  var $language;
  var $directory;
  var $filename;
  var $url;
  var $delimiter;
  var $nl;
  var $format;
            //  component internal variables
  var $attributeDelimiter;
  var $valueInit;
            //  component xCal declaration container
  var $xcaldecl;
/*
 * constructor for calendar object
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.2.13 - 2007-12-30
 * @return void
 */
  function vcalendar () {
    $this->_makeVersion();
    $this->calscale   = null;
    $this->method     = null;
    $this->_makeUnique_id();
    $this->prodid     = null;
    $this->xprop      = array();
/**
 *   language = <Text identifying a language, as defined in [RFC 1766]>
 */
    if( defined( 'ICAL_LANG' ))
      $this->setConfig( 'language', ICAL_LANG );
    $this->setConfig( 'allowEmpty', TRUE );
    $this->setConfig( 'nl',         "\n" );
    $this->setConfig( 'format',     'iCal');
    $this->directory  = null;
    $this->filename   = null;
    $this->url        = null;
    $this->setConfig( 'delimiter',  DIRECTORY_SEPARATOR );
    $this->xcaldecl   = array();
    $this->components = array();
  }
/*********************************************************************************/
/**
 * Property Name: CALSCALE
 */
/**
 * creates formatted output for calendar property calscale
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @return string
 */
  function createCalscale() {
    if( empty( $this->calscale )) return FALSE;
    switch( $this->format ) {
      case 'xcal':
        return ' calscale="'.$this->calscale.'"'.$this->nl;
        break;
      default:
        return 'CALSCALE:'.$this->calscale.$this->nl;
        break;
    }
  }
/**
 * set calendar property calscale
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-10-21
 * @param string $value
 * @return void
 */
  function setCalscale( $value ) {
    if( empty( $value )) return FALSE;
    $this->calscale = $value;
  }
/*********************************************************************************/
/**
 * Property Name: METHOD
 */
/**
 * creates formatted output for calendar property method
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createMethod() {
    if( empty( $this->method )) return FALSE;
    switch( $this->format ) {
      case 'xcal':
        return ' method="'.$this->method.'"'.$this->nl;
        break;
      default:
        return 'METHOD:'.$this->method.$this->nl;
        break;
    }
  }
/**
 * set calendar property method
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 2.4.8 - 2008-20-23
 * @param string $value
 * @return bool
 */
  function setMethod( $value ) {
    if( empty( $value )) return FALSE;
    $this->method = $value;
    return TRUE;
  }
/*********************************************************************************/
/**
 * Property Name: PRODID
 *
 *  The identifier is RECOMMENDED to be the identical syntax to the
 * [RFC 822] addr-spec. A good method to assure uniqueness is to put the
 * domain name or a domain literal IP address of the host on which.. .
 */
/**
 * creates formatted output for calendar property prodid
 *
 * @author Kjell-Inge Gustafsson <ical@kigkonsult.se>
 * @since 0.9.7 - 2006-11-20
 * @return string
 */
  function createProdid() {
    if( !isset( $this->prodid ))
      $this->_makeProdid();
    switch( $this->format ) {
      case 'xcal':