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<?php
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/**
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* @file
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* Defines a class that parses iCalcreator vcalendar objects into
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* Feeds-compatible data arrays.
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*/
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class ParserVcalendar {
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/**
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* Variables used for parsing.
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*/
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protected $calendar;
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protected $source;
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protected $fetcherResult;
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protected $config;
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protected $timezones = array();
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protected $xtimezone;
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/**
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* The parsed data for the component that's currently being processed.
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*
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* ParserVcalendar parses one component at a time. This array is stored as a
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* property so that each handler can tell what work the previous handlers
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* have already completed on the current component.
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*
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* @var array
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*/
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protected $parsed_data = array();
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/**
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* Variables used for batch processing.
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*/
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protected $totalComponents = 0;
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protected $lastComponentParsed = 0;
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/**
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* Constructor.
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*/
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public function __construct($calendar, $source, $fetcher_result, $config) {
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$this->calendar = $calendar;
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$this->source = $source;
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$this->mapping_sources = feeds_importer($source->id)->parser->getMappingSources();
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$this->fetcherResult = $fetcher_result;
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$this->config = $config;
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}
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/**
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* Parses the vcalendar object into an array of event data arrays.
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*
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* @param int $offset
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* Specifies which section of the feed to start parsing at.
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*
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* @param int $limit
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* Specifies how many components to parse on this run.
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*
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* @return array
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* An array of parsed event data keyed by our mapping source property keys.
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*/
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public function parse($offset, $limit) {
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// Sometimes, the feed will set a timezone for every event in the calendar
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// using the non-standard X-WR-TIMEZONE property. Date iCal uses this
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// timezone only if the date property is not in UTC and has no TZID.
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$xtimezone = $this->calendar->getProperty('X-WR-TIMEZONE');
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if (!empty($xtimezone[1])) {
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// Allow modules to alter the timezone string before it gets converted
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// into a DateTimeZone.
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$context = array(
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'property_key' => NULL,
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'calendar_component' => NULL,
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'calendar' => $this->calendar,
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'feeeds_source' => $this->source,
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'feeds_fetcher_result' => $this->fetcherResult,
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);
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drupal_alter('date_ical_import_timezone', $xtimezone[1], $context);
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$this->xtimezone = $this->_tzid_to_datetimezone($xtimezone[1]);
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}
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// Collect the timezones into an array, for easier access.
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while ($component = $this->calendar->getComponent('VTIMEZONE')) {
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$this->timezones[] = $component;
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}
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// This content array is used by date_ical_import_component_alter() and
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// date_ical_import_parsed_data_alter().
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$context2 = array(
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'calendar' => $this->calendar,
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'source' => $this->source,
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'fetcher_result' => $this->fetcherResult,
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);
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// Collect each component, so we can batch them properly in the next loop.
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$raw_components = array();
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$types = array('VEVENT', 'VTODO', 'VJOURNAL', 'VFREEBUSY', 'VALARM');
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foreach ($types as $type) {
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while ($vcalendar_component = $this->calendar->getComponent($type)) {
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// Allow modules to alter the vcalendar component before we parse it
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// into a Feeds-compatible data array.
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drupal_alter('date_ical_import_component', $vcalendar_component, $context2);
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$raw_components[] = $vcalendar_component;
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}
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}
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// Store this for use by DateiCalFeedsParser's batch processing code.
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$this->totalComponents = count($raw_components);
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// Parse each raw component in the current batch into a Feeds-compatible
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// event data array.
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$events = array();
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$batch = array_slice($raw_components, $offset, $limit, TRUE);
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foreach ($batch as $ndx => $raw_component) {
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$this->parsed_data = array();
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foreach ($this->mapping_sources as $property_key => $data) {
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$handler = NULL;
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if (isset($data['date_ical_parse_handler'])) {
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$handler = $data['date_ical_parse_handler'];
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}
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else {
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// This is not one of our sources, so if we don't recognize and
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// support it, we'll have to pass a warning to the user.
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if ($property_key == 'geofield') {
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$handler = 'parseGeofield';
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}
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else {
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// We can safely ignore certain sources.
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$known_unknowns = array(
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// "Black Source 1" is from Feeds Tamper.
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'Blank source 1',
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);
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if (!in_array($property_key, $known_unknowns)) {
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// Only warn the user if this mapping source is in use.
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foreach ($this->source->importer->processor->config['mappings'] as $mapping) {
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if ($mapping['source'] == $property_key) {
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drupal_set_message(t('Date iCal does not recognize the "@name" Mapping Source, and must skip it.', array('@name' => $data['name'])), 'warning', FALSE);
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break;
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}
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}
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}
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}
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}
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if ($handler) {
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$this->parsed_data[$property_key] = $this->$handler($property_key, $raw_component);
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}
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if ($property_key == 'geofield' && !empty($this->parsed_data['geofield'])) {
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// To make our data readable by geofield_feeds_combined_source(), we
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// need to put it into the format output by Simplepie 1.3.
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$this->parsed_data['location_latitude'] = array($this->parsed_data['geofield']['lat']);
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$this->parsed_data['location_longitude'] = array($this->parsed_data['geofield']['lon']);
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}
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}
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// Allow modules to alter the final parsed data before we send it to the
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// Feeds processor.
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drupal_alter('date_ical_import_post_parse', $this->parsed_data, $context2);
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// Skip this event if it's earlier than the user's specified skip time.
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if (!$this->_skip_current_event()) {
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$events[] = $this->parsed_data;
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}
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// The indices of the original $raw_components array are preserved in
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// $batch, so using the $ndx value here lets us communicate our progress
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// through the full collection of components.
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$this->lastComponentParsed = $ndx;
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}
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return $events;
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}
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/**
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* Getter for the protected totalComponents property.
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*/
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public function getTotalComponents() {
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return $this->totalComponents;
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}
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/**
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* Getter for the protected lastComponentParsed property.
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*/
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public function getLastComponentParsed() {
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return $this->lastComponentParsed;
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}
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/**
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* Handler that parses text fields.
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*
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* @return string
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* The parsed text property.
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*/
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public function parseTextProperty($property_key, $vcalendar_component) {
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$text = $vcalendar_component->getProperty($property_key);
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if ($text === FALSE) {
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if ($property_key == 'SUMMARY') {
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$uid = $vcalendar_component->getProperty('UID');
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throw new DateIcalParseException(t('The component with UID %uid is invalid because it has no SUMMARY (nodes require a title).', array('%uid' => $uid)));
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}
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// If the component doesn't have this property, return NULL.
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return NULL;
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}
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// Convert literal \n and \N into newline characters.
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$text = str_replace(array('\n', '\N'), "\n", $text);
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return $text;
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}
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/**
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* Handler that parses GEO fields.
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*
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* @return array
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* The latitude and longitude values, keyed by 'lat' and 'lon'.
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*/
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public function parseGeofield($property_key, $vcalendar_component) {
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$geo = array();
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if (!empty($vcalendar_component->geo['value'])) {
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$geo['lat'] = $vcalendar_component->geo['value']['latitude'];
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$geo['lon'] = $vcalendar_component->geo['value']['longitude'];
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}
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return $geo;
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}
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/**
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* Handler that parses field parameters.
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*
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* @return string
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* The parsed field parameter.
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*/
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public function parsePropertyParameter($property_key, $vcalendar_component) {
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list($key, $attr) = explode(':', $property_key);
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$property = $vcalendar_component->getProperty($key, FALSE, TRUE);
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if ($property === FALSE) {
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// If the component doesn't have this property, return NULL.
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return NULL;
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}
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$param = isset($property['params'][$attr]) ? $property['params'][$attr] : '';
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return $param;
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}
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/**
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* Handler that parses DATE-TIME and DATE fields.
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*
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* @return FeedsDateTime
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* The parsed datetime object.
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*/
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public function parseDateTimeProperty($property_key, $vcalendar_component) {
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$property = $vcalendar_component->getProperty($property_key, FALSE, TRUE);
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// Gather all the other date properties, so we can work with them later.
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$duration = $vcalendar_component->getProperty('DURATION', FALSE, TRUE);
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$dtstart = $vcalendar_component->getProperty('DTSTART', FALSE, TRUE);
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$uid = $vcalendar_component->getProperty('UID');
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// DATE-type properties are treated as All Day events which can span over
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// multiple days.
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// The Date module's All Day event handling was never finalized
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// (http://drupal.org/node/874322), which requires us to do some some
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// special coddling later.
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$is_all_day = (isset($property['params']['VALUE']) && $property['params']['VALUE'] == 'DATE');
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// Cover various conditions in which either DTSTART or DTEND are not set.
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if ($property === FALSE) {
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// When DTEND isn't defined, we may need to emulate it.
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if ($property_key == 'DTEND') {
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// Unset DTENDs need to emulate the DATE type from DTSTART.
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$is_all_day = (isset($dtstart['params']['VALUE']) && $dtstart['params']['VALUE'] == 'DATE');
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if ($duration !== FALSE) {
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// If a DURATION is defined, emulate DTEND as DTSTART + DURATION.
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$property = array(
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'value' => iCalUtilityFunctions::_duration2date($dtstart['value'], $duration['value']),
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'params' => $dtstart['params'],
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);
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}
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elseif ($is_all_day) {
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// If this is an all-day event with no end or duration, treat this
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// as a single-day event by emulating DTEND as 1 day after DTSTART.
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$property = $dtstart;
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$property['value'] = iCalUtilityFunctions::_duration2date($property['value'], array('day' => 1));
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}
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else {
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// This event has no end date.
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return NULL;
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}
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}
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elseif ($property_key == 'DTSTART') {
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// DTSTART can only be legally unset in non-VEVENT components.
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if ($vcalendar_component->objName == 'vevent') {
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throw new DateIcalParseException(t('Feed import failed! The VEVENT with UID %uid is invalid: it has no DTSTART.', array('%uid' => $uid)));
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}
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else {
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return NULL;
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}
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}
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}
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// When iCalcreator parses a UTC date (one that ends with Z) from an iCal
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// feed, it stores that 'Z' into the $property['value']['tz'] value.
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if (isset($property['value']['tz'])) {
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$property['params']['TZID'] = 'UTC';
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}
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if ($is_all_day) {
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if ($property_key == 'DTEND') {
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if ($dtstart === FALSE) {
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// This will almost certainly never happen, but the error message
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// would be incomprehensible without this check.
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throw new DateIcalParseException(t('Feed import failed! The event with UID %uid is invalid: it has a DTEND but no DTSTART!', array('%uid' => $uid)));
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}
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if (module_exists('date_all_day')) {
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// If the Date All Day module is installed, we need to rewind the
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// DTEND by one day, because of the problem with FeedsDateTime
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// mentioned below.
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$prev_day = iCalUtilityFunctions::_duration2date($property['value'], array('day' => -1));
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$property['value'] = $prev_day;
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}
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}
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314
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315
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// FeedsDateTime->setTimezone() ignores timezone changes made to dates
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// with no time element, which means we can't compensate for the Date
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317
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// module's automatic timezone conversion when it writes to the DB. To
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318
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// get around that, we must add 00:00:00 explicitly, even though this
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// causes other problems (see above and below).
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$date_string = sprintf('%d-%d-%d 00:00:00', $property['value']['year'], $property['value']['month'], $property['value']['day']);
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// Use the server's timezone rather than letting it default to UTC.
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// This will help ensure that the date value doesn't get messed up when
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// Date converts its timezone as the value is read from the database.
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// This is *essential* for All Day events, because Date stores them as
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325
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// '2013-10-03 00:00:00' in the database, rather than doing the sensible
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// thing and storing them as '2013-10-03'.
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// NOTE TO MAINTAINERS:
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328
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// This will not work properly if the site is configured to allow users
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// to set their own timezone. Unfortunately, there isn't anything that
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330
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// Date iCal can do about that, as far as I can tell.
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331
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$datetimezone = new DateTimeZone(date_default_timezone_get());
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332
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}
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else {
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// This is a DATE-TIME property.
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$date_string = iCalUtilityFunctions::_format_date_time($property['value']);
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336
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// Allow modules to alter the timezone string. This also allows for
|
338
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// setting a TZID when one was not originally set for this property.
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$tzid = isset($property['params']['TZID']) ? $property['params']['TZID'] : NULL;
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340
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$context = array(
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341
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'property_key' => $property_key,
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342
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'calendar_component' => $vcalendar_component,
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343
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'calendar' => $this->calendar,
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344
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'feeeds_source' => $this->source,
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345
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'feeds_fetcher_result' => $this->fetcherResult,
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346
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);
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347
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drupal_alter('date_ical_import_timezone', $tzid, $context);
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348
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349
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if (isset($tzid)) {
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350
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$datetimezone = $this->_tzid_to_datetimezone($tzid);
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351
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}
|
352
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elseif (isset($this->xtimezone)) {
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353
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// No timezone was set on the parsed date property, so if a timezone
|
354
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// was detected for the entire iCal feed, use it.
|
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$datetimezone = $this->xtimezone;
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356
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}
|
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else {
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$msg = t("No timezone was detected for one or more of the events in this feed, forcing Date iCal to use this server's timezone as a fallback.<br>
|
359
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To make timezone-less events use a different timezone, implement hook_date_ical_import_timezone_alter() in a custom module.");
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360
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drupal_set_message($msg, 'status', FALSE);
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$this->source->log('parse', $msg, array(), WATCHDOG_NOTICE);
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362
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$datetimezone = new DateTimeZone(date_default_timezone_get());
|
363
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}
|
364
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}
|
365
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|
366
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$datetime = new FeedsDateTime($date_string, $datetimezone);
|
367
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return $datetime;
|
368
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}
|
369
|
|
370
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/**
|
371
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* Handler that parses multi-value fields, like the CATEGORIES component.
|
372
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*
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* @return array
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374
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* An array of strings contaning the individual values.
|
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*/
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376
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public function parseMultivalueProperty($property_key, $vcalendar_component) {
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// Since we're not telling it to give us the params data, $property will
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// be either FALSE, a string, or an array of strings.
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$property = $vcalendar_component->getProperty($property_key);
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380
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if (empty($property)) {
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381
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// If this multi-value property is being mapped to a Taxonomy field,
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382
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// Feeds will interpret anything besides empty array as an array of
|
383
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// empty values (e.g. array('')). This will create a term for that
|
384
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// empty value, rather than leaving the field blank.
|
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return array();
|
386
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}
|
387
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if (!is_array($property)) {
|
388
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$property = array($property);
|
389
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}
|
390
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return $property;
|
391
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}
|
392
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|
393
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/**
|
394
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* Handler that parses RRULE, RDATE, EXRULE, and EXDATE together.
|
395
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*
|
396
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* @return string
|
397
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* The RRULE, RDATE, EXRULE, and EXDATE values concatinated with |.
|
398
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*/
|
399
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public function parseRepeatProperty($property_key, $vcalendar_component) {
|
400
|
if ($vcalendar_component->getProperty($property_key) === FALSE) {
|
401
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return NULL;
|
402
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}
|
403
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|
404
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$uid = $vcalendar_component->getProperty('UID');
|
405
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$count = $this->config['indefinite_count'];
|
406
|
// Due to a few bugs and limitations with Date Repeat, we need to massage
|
407
|
// the RRULE a bit.
|
408
|
if (count($vcalendar_component->rrule) > 1) {
|
409
|
$msg = 'The event with UID %uid has multiple RRULEs, but the Date Repeat module only supports one. Only the first RRULE in the event will be used.
|
410
|
If your events need to have a complex repeat pattern, using RDATEs should help.';
|
411
|
watchdog('date_ical', $msg, array('%uid' => $uid), 'warning');
|
412
|
drupal_set_message('At least one of the events in this iCal feed has multiple RRULEs, but the Date Repeat module only supports one.
|
413
|
Only the first RRULE in an event will be used.', 'warning', FALSE);
|
414
|
|
415
|
// Date Repeat will get extremely confused if it's sent multiple RRULE
|
416
|
// values, so we need to manually pare it down to only the first one.
|
417
|
$vcalendar_component->rrule = array($vcalendar_component->rrule[0]);
|
418
|
}
|
419
|
foreach ($vcalendar_component->rrule as &$rrule_data) {
|
420
|
// RRULEs must have an INTERVAL, or Date Repeat will throw errors.
|
421
|
if (!isset($rrule_data['value']['INTERVAL'])) {
|
422
|
$rrule_data['value']['INTERVAL'] = '1';
|
423
|
}
|
424
|
|
425
|
if (!isset($rrule_data['value']['COUNT']) && !isset($rrule_data['value']['UNTIL'])) {
|
426
|
$msg = "The event with UID %uid has an indefinitely repeating RRULE, which the Date Repeat module doesn't support.
|
427
|
As a workaround, Date iCal set the repeat count to @count. This value can be customized in the iCal parser settings.";
|
428
|
watchdog('date_ical', $msg, array('%uid' => $uid, '@count' => $count), WATCHDOG_WARNING);
|
429
|
drupal_set_message(
|
430
|
t("At least one of the events in this iCal feed has an indefinitely repeating RRULE, which the Date Repeat module doesn't support.<br>
|
431
|
As a workaround, Date iCal set the repeat count to @count. This value can be customized in the iCal parser settings.",
|
432
|
array('@count' => $count)),
|
433
|
'warning',
|
434
|
FALSE
|
435
|
);
|
436
|
$rrule_data['value']['COUNT'] = $this->config['indefinite_count'];
|
437
|
}
|
438
|
}
|
439
|
|
440
|
$rrule = trim($vcalendar_component->createRrule());
|
441
|
$rdate = trim($vcalendar_component->createRdate());
|
442
|
$exrule = trim($vcalendar_component->createExrule());
|
443
|
$exdate = trim($vcalendar_component->createExdate());
|
444
|
return "$rrule|$rdate|$exrule|$exdate";
|
445
|
}
|
446
|
|
447
|
/**
|
448
|
* Internal helper function for creating DateTimeZone objects.
|
449
|
*/
|
450
|
protected function _tzid_to_datetimezone($tzid) {
|
451
|
try {
|
452
|
$datetimezone = new DateTimeZone($tzid);
|
453
|
}
|
454
|
catch (Exception $e) {
|
455
|
// In case this is a Windows TZID, read the mapping file to try and
|
456
|
// convert it to a real TZID.
|
457
|
$zones = file_get_contents(drupal_get_path('module', 'date_ical') . '/libraries/windowsZones.json');
|
458
|
$zones_assoc = json_decode($zones, TRUE);
|
459
|
$windows_to_olson_map = array();
|
460
|
foreach ($zones_assoc['supplemental']['windowsZones']['mapTimezones'] as $mapTimezone) {
|
461
|
if ($mapTimezone['mapZone']['_other'] == $tzid) {
|
462
|
// Parse out the space-separated TZIDs from $mapTimezone['mapZone']['_type'].
|
463
|
$tzids = preg_split('/\s/', $mapTimezone['mapZone']['_type']);
|
464
|
try {
|
465
|
// They all have the same UTC offset, so for our purposes we can
|
466
|
// just take the first one.
|
467
|
return new DateTimeZone($tzids[0]);
|
468
|
}
|
469
|
catch (Exception $e) {
|
470
|
// If this one also fails, we're out of luck, so just fall through
|
471
|
// to the regular error report code.
|
472
|
break;
|
473
|
}
|
474
|
}
|
475
|
}
|
476
|
|
477
|
$tz_wiki = l(t('here'), 'http://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List');
|
478
|
$help = l(t('README'), 'admin/help/date_ical', array('absolute' => TRUE));
|
479
|
$msg = t(
|
480
|
'"@tz" is not a valid timezone (see the TZ column !here), so Date iCal had to fall back to UTC (which is probably wrong!).<br>
|
481
|
Please read the Date iCal !readme for instructions on how to fix this.',
|
482
|
array('@tz' => $tzid, '!here' => $tz_wiki, '!readme' => $help)
|
483
|
);
|
484
|
$this->source->log('parse', $msg, array(), WATCHDOG_WARNING);
|
485
|
drupal_set_message($msg, 'warning', FALSE);
|
486
|
$datetimezone = new DateTimeZone('UTC');
|
487
|
}
|
488
|
return $datetimezone;
|
489
|
}
|
490
|
|
491
|
/**
|
492
|
* Internal helper function for skipping old events.
|
493
|
*/
|
494
|
protected function _skip_current_event() {
|
495
|
// Must use !isset() here, because 0 and NULL mean different things.
|
496
|
if (!isset($this->config['skip_days'])) {
|
497
|
return FALSE;
|
498
|
}
|
499
|
$compare_date = isset($this->parsed_data['DTEND']) ? $this->parsed_data['DTEND'] : $this->parsed_data['DTSTART'];
|
500
|
$skip_date = new FeedsDateTime("today -{$this->config['skip_days']} days", $compare_date->getTimezone());
|
501
|
$skip = ($skip_date > $compare_date);
|
502
|
return $skip;
|
503
|
}
|
504
|
}
|