411 lines
11 KiB
PHP
411 lines
11 KiB
PHP
<?php
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/**
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* Parse ics file content to array.
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*
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* PHP Version 5
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*
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* @category Parser
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* @author Martin Thoma
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* @author Christoph Haas <mail@h44z.net>
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* @modified 17.11.2012 by Christoph Haas (original at http://code.google.com/p/ics-parser/)
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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* @version SVN: 62
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* @example $ical = new ical('calendar.ics');
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* print_r( $ical->events() );
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*/
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/**
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* This is the iCal-class
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*
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* @param {string} filename The name of the file which should be parsed
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* @constructor
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*/
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class ICal {
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/* How many ToDos are in this ical? */
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public /** @type {int} */ $todo_count = 0;
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/* How many events are in this ical? */
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public /** @type {int} */ $event_count = 0;
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/* Currently editing an alarm? */
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private /** @type {int} */ $isalarm = false;
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/* The parsed calendar */
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public /** @type {Array} */ $cal;
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/* Error message store... null default */
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public /** @type {String} */ $errors;
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/* Which keyword has been added to cal at last? */
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private /** @type {string} */ $_lastKeyWord;
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/* The default timezone, used to convert UTC Time */
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private /** @type {string} */ $default_timezone = "Europe/Vienna";
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/**
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* Creates the iCal-Object
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*
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* @param {string} $filename The path to the iCal-file
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*
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* @return Object The iCal-Object
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*/
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public function __construct($filename) {
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if (!$filename) {
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$this->errors = "No filename specified";
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return false;
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}
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$lines = file($filename, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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if (stristr($lines[0], 'BEGIN:VCALENDAR') === false) {
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$this->errors = "Not a valid ical file";
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return false;
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} else {
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foreach ($lines as $line) {
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$line = trim($line);
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$add = $this->keyValueFromString($line);
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if ($add === false) {
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$this->addCalendarComponentWithKeyAndValue($type, false, $line);
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continue;
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}
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list($keyword, $prop, $propvalue, $value) = $add;
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switch ($line) {
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// http://www.kanzaki.com/docs/ical/vtodo.html
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case "BEGIN:VTODO":
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$this->todo_count++;
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$type = "VTODO";
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break;
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case "BEGIN:VALARM":
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//echo "vevent gematcht";
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$this->isalarm=true;
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$type = "VEVENT";
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break;
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// http://www.kanzaki.com/docs/ical/vevent.html
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case "BEGIN:VEVENT":
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//echo "vevent gematcht";
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$this->event_count++;
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$type = "VEVENT";
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break;
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//all other special strings
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case "BEGIN:VCALENDAR":
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case "BEGIN:DAYLIGHT":
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// http://www.kanzaki.com/docs/ical/vtimezone.html
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case "BEGIN:VTIMEZONE":
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case "BEGIN:STANDARD":
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$type = $value;
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break;
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case "END:VTODO": // end special text - goto VCALENDAR key
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case "END:VEVENT":
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case "END:VCALENDAR":
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case "END:DAYLIGHT":
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case "END:VTIMEZONE":
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case "END:STANDARD":
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$type = "VCALENDAR";
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break;
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case "END:VALARM":
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$this->isalarm=false;
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$type = "VEVENT";
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break;
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default:
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$this->addCalendarComponentWithKeyAndValue($type, $keyword, $value, $prop, $propvalue);
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break;
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}
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}
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return $this->cal;
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}
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}
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/**
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* Add to $this->ical array one value and key.
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*
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* @param {string} $component This could be VTODO, VEVENT, VCALENDAR, ...
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* @param {string} $keyword The keyword, for example DTSTART
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* @param {string} $value The value, for example 20110105T090000Z
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*
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* @return {None}
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*/
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public function addCalendarComponentWithKeyAndValue($component, $keyword, $value, $prop = false, $propvalue = false) {
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if ($keyword == false) { // multiline value
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$keyword = $this->last_keyword;
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switch ($component) {
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case 'VEVENT':
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if (stristr($keyword, "DTSTART") or stristr($keyword, "DTEND") or stristr($keyword, "TRIGGER")) {
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$ts = $this->iCalDateToUnixTimestamp($value, $prop, $propvalue);
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$value = $ts * 1000;
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}
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$value = str_replace("\\n", "\n", $value);
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if(!$this->isalarm) {
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$value = $this->cal[$component][$this->event_count - 1][$keyword].$value;
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} else {
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$value = $this->cal[$component][$this->event_count - 1]["VALARM"][$keyword].$value;
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}
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break;
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case 'VTODO' :
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$value = $this->cal[$component][$this->todo_count - 1]
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[$keyword].$value;
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break;
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}
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}
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/* This should not be neccesary anymore*/
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//always strip additional content....
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//if (stristr($keyword, "DTSTART") or stristr($keyword, "DTEND")) {
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//$keyword = explode(";", $keyword);
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//$keyword = $keyword[0]; // remove additional content like VALUE=DATE
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//}
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if (stristr($keyword, "TIMEZONE")) {
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$this->default_timezone = $value; // store the calendertimezone
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}
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switch ($component) {
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case "VTODO":
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$this->cal[$component][$this->todo_count - 1][$keyword] = $value;
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//$this->cal[$component][$this->todo_count]['Unix'] = $unixtime;
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break;
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case "VEVENT":
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if (stristr($keyword, "DTSTART") or stristr($keyword, "DTEND") or stristr($keyword, "TRIGGER")) {
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$ts = $this->iCalDateToUnixTimestamp($value, $prop, $propvalue);
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$value = $ts * 1000;
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}
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$value = str_replace("\\n", "\n", $value);
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if(!$this->isalarm) {
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$this->cal[$component][$this->event_count - 1][$keyword] = $value;
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} else {
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$this->cal[$component][$this->event_count - 1]["VALARM"][$keyword] = $value;
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}
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break;
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default:
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$this->cal[$component][$keyword] = $value;
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break;
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}
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$this->last_keyword = $keyword;
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}
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/**
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* Get a key-value pair of a string.
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*
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* @param {string} $text which is like "VCALENDAR:Begin" or "LOCATION:"
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*
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* @return {array} array("VCALENDAR", "Begin", "Optional Props")
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*/
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public function keyValueFromString($text) {
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preg_match("/(^[^a-z:;]+)[;]*([a-zA-Z]*)[=]*(.*)[:]([\w\W]*)/", $text, $matches);
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if (count($matches) == 0) {
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return false;
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}
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$matches = array_splice($matches, 1, 4);
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return $matches;
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}
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/**
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* Return Unix timestamp from ical date time format
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*
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* @param {string} $icalDate A Date in the format YYYYMMDD[T]HHMMSS[Z] or
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* YYYYMMDD[T]HHMMSS
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*
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* @return {int}
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*/
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public function iCalDateToUnixTimestamp($icalDate, $prop, $propvalue) {
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$timezone = false;
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if($prop) {
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$pos = strpos("TZIDtzid", $prop);
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if($pos !== false && $propvalue != false) {
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$timezone = str_replace('"', '', $propvalue);
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$timezone = str_replace('\'', '', $timezone);
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}
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}
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/* timestring format */
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$utc = strpos("zZ",substr($icalDate, -1)) === false ? false : true;
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$icalDate = str_replace('T', '', $icalDate);
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$icalDate = str_replace('Z', '', $icalDate);
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$pattern = '/([0-9]{4})'; // 1: YYYY
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$pattern .= '([0-9]{2})'; // 2: MM
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$pattern .= '([0-9]{2})'; // 3: DD
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$pattern .= '([0-9]{0,2})'; // 4: HH
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$pattern .= '([0-9]{0,2})'; // 5: MM
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$pattern .= '([0-9]{0,2})/'; // 6: SS
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preg_match($pattern, $icalDate, $date);
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// Unix timestamp can't represent dates before 1970
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if ($date[1] <= 1970) {
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return false;
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}
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// Unix timestamps after 03:14:07 UTC 2038-01-19 might cause an overflow
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// if 32 bit integers are used.
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$timestamp = mktime((int)$date[4],
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(int)$date[5],
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(int)$date[6],
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(int)$date[2],
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(int)$date[3],
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(int)$date[1]);
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if(!$utc) {
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$tz = $this->default_timezone;
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if($timezone != false) {
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$tz = $timezone;
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}
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$error = false;
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$this_tz = false;
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try {
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$this_tz = new DateTimeZone($tz);
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} catch(Exception $e) {
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error_log($e->getMessage());
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$error = true;
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}
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if($error) {
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try { // Try using the default calendar timezone
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$this_tz = new DateTimeZone($this->default_timezone);
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} catch(Exception $e) {
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error_log($e->getMessage());
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$timestamp_utc = $timestamp; // if that fails, we cannot do anymore
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}
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}
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if($this_tz != false) {
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$tz_now = new DateTime("now", $this_tz);
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$tz_offset = $this_tz->getOffset($tz_now);
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$timestamp_utc = $timestamp - $tz_offset;
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}
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} else {
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$timestamp_utc = $timestamp;
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}
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return ($timestamp_utc);
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}
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/**
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* Returns an array of arrays with all events. Every event is an associative
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* array and each property is an element it.
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*
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* @return {array}
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*/
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public function events() {
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$array = $this->cal;
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return $array['VEVENT'];
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}
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/**
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* Returns an array of calendar types.
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*
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* @return {array}
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*/
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public function calendar() {
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$array = $this->cal;
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return $array['VCALENDAR'];
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}
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/**
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* Returns a boolean value whether thr current calendar has events or not
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*
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* @return {boolean}
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*/
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public function hasEvents() {
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return ( count($this->events()) > 0 ? true : false );
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}
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/**
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* Returns false when the current calendar has no events in range, else the
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* events.
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*
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* Note that this function makes use of a UNIX timestamp. This might be a
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* problem on January the 29th, 2038.
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* See http://en.wikipedia.org/wiki/Unix_time#Representing_the_number
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*
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* @param {boolean} $rangeStart Either true or false
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* @param {boolean} $rangeEnd Either true or false
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*
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* @return {mixed}
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*/
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public function eventsFromRange($rangeStart = false, $rangeEnd = false) {
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$events = $this->sortEventsWithOrder($this->events(), SORT_ASC);
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if (!$events) {
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return false;
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}
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$extendedEvents = array();
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if ($rangeStart !== false) {
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$rangeStart = new DateTime();
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}
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if ($rangeEnd !== false or $rangeEnd <= 0) {
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$rangeEnd = new DateTime('2038/01/18');
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} else {
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$rangeEnd = new DateTime($rangeEnd);
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}
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$rangeStart = $rangeStart->format('U');
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$rangeEnd = $rangeEnd->format('U');
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// loop through all events by adding two new elements
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foreach ($events as $anEvent) {
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$timestamp = $this->iCalDateToUnixTimestamp($anEvent['DTSTART']);
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if ($timestamp >= $rangeStart && $timestamp <= $rangeEnd) {
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$extendedEvents[] = $anEvent;
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}
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}
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return $extendedEvents;
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}
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/**
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* Returns sorted events
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*
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* @param {array} $events An array with events.
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* @param {array} $sortOrder Either SORT_ASC, SORT_DESC, SORT_REGULAR,
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* SORT_NUMERIC, SORT_STRING
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*
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* @return {array}
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*/
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public function sortEventsWithOrder($events, $sortOrder = SORT_ASC) {
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$extendedEvents = array();
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// loop through all events by adding two new elements
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foreach ($events as $anEvent) {
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if (!array_key_exists('UNIX_TIMESTAMP', $anEvent)) {
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$anEvent['UNIX_TIMESTAMP'] =
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$this->iCalDateToUnixTimestamp($anEvent['DTSTART']);
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}
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if (!array_key_exists('REAL_DATETIME', $anEvent)) {
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$anEvent['REAL_DATETIME'] =
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date("d.m.Y", $anEvent['UNIX_TIMESTAMP']);
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}
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$extendedEvents[] = $anEvent;
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}
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foreach ($extendedEvents as $key => $value) {
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$timestamp[$key] = $value['UNIX_TIMESTAMP'];
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}
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array_multisort($timestamp, $sortOrder, $extendedEvents);
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return $extendedEvents;
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}
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}
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?>
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