--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/lib/Component/VCalendar.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,490 @@
+<?php
+
+namespace Sabre\VObject\Component;
+
+use DateTime;
+use DateTimeZone;
+use Sabre\VObject;
+use Sabre\VObject\Component;
+use Sabre\VObject\Recur\EventIterator;
+use Sabre\VObject\Recur\NoInstancesException;
+
+/**
+ * The VCalendar component
+ *
+ * This component adds functionality to a component, specific for a VCALENDAR.
+ *
+ * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class VCalendar extends VObject\Document {
+
+    /**
+     * The default name for this component.
+     *
+     * This should be 'VCALENDAR' or 'VCARD'.
+     *
+     * @var string
+     */
+    static $defaultName = 'VCALENDAR';
+
+    /**
+     * This is a list of components, and which classes they should map to.
+     *
+     * @var array
+     */
+    static $componentMap = array(
+        'VALARM'    => 'Sabre\\VObject\\Component\\VAlarm',
+        'VEVENT'    => 'Sabre\\VObject\\Component\\VEvent',
+        'VFREEBUSY' => 'Sabre\\VObject\\Component\\VFreeBusy',
+        'VJOURNAL'  => 'Sabre\\VObject\\Component\\VJournal',
+        'VTIMEZONE' => 'Sabre\\VObject\\Component\\VTimeZone',
+        'VTODO'     => 'Sabre\\VObject\\Component\\VTodo',
+    );
+
+    /**
+     * List of value-types, and which classes they map to.
+     *
+     * @var array
+     */
+    static $valueMap = array(
+        'BINARY'           => 'Sabre\\VObject\\Property\\Binary',
+        'BOOLEAN'          => 'Sabre\\VObject\\Property\\Boolean',
+        'CAL-ADDRESS'      => 'Sabre\\VObject\\Property\\ICalendar\\CalAddress',
+        'DATE'             => 'Sabre\\VObject\\Property\\ICalendar\\Date',
+        'DATE-TIME'        => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DURATION'         => 'Sabre\\VObject\\Property\\ICalendar\\Duration',
+        'FLOAT'            => 'Sabre\\VObject\\Property\\Float',
+        'INTEGER'          => 'Sabre\\VObject\\Property\\Integer',
+        'PERIOD'           => 'Sabre\\VObject\\Property\\ICalendar\\Period',
+        'RECUR'            => 'Sabre\\VObject\\Property\\ICalendar\\Recur',
+        'TEXT'             => 'Sabre\\VObject\\Property\\Text',
+        'TIME'             => 'Sabre\\VObject\\Property\\Time',
+        'UNKNOWN'          => 'Sabre\\VObject\\Property\\Unknown', // jCard / jCal-only.
+        'URI'              => 'Sabre\\VObject\\Property\\Uri',
+        'UTC-OFFSET'       => 'Sabre\\VObject\\Property\\UtcOffset',
+    );
+
+    /**
+     * List of properties, and which classes they map to.
+     *
+     * @var array
+     */
+    static $propertyMap = array(
+        // Calendar properties
+        'CALSCALE'      => 'Sabre\\VObject\\Property\\FlatText',
+        'METHOD'        => 'Sabre\\VObject\\Property\\FlatText',
+        'PRODID'        => 'Sabre\\VObject\\Property\\FlatText',
+        'VERSION'       => 'Sabre\\VObject\\Property\\FlatText',
+
+        // Component properties
+        'ATTACH'            => 'Sabre\\VObject\\Property\\Uri',
+        'CATEGORIES'        => 'Sabre\\VObject\\Property\\Text',
+        'CLASS'             => 'Sabre\\VObject\\Property\\FlatText',
+        'COMMENT'           => 'Sabre\\VObject\\Property\\FlatText',
+        'DESCRIPTION'       => 'Sabre\\VObject\\Property\\FlatText',
+        'GEO'               => 'Sabre\\VObject\\Property\\Float',
+        'LOCATION'          => 'Sabre\\VObject\\Property\\FlatText',
+        'PERCENT-COMPLETE'  => 'Sabre\\VObject\\Property\\Integer',
+        'PRIORITY'          => 'Sabre\\VObject\\Property\\Integer',
+        'RESOURCES'         => 'Sabre\\VObject\\Property\\Text',
+        'STATUS'            => 'Sabre\\VObject\\Property\\FlatText',
+        'SUMMARY'           => 'Sabre\\VObject\\Property\\FlatText',
+
+        // Date and Time Component Properties
+        'COMPLETED'     => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DTEND'         => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DUE'           => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DTSTART'       => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DURATION'      => 'Sabre\\VObject\\Property\\ICalendar\\Duration',
+        'FREEBUSY'      => 'Sabre\\VObject\\Property\\ICalendar\\Period',
+        'TRANSP'        => 'Sabre\\VObject\\Property\\FlatText',
+
+        // Time Zone Component Properties
+        'TZID'          => 'Sabre\\VObject\\Property\\FlatText',
+        'TZNAME'        => 'Sabre\\VObject\\Property\\FlatText',
+        'TZOFFSETFROM'  => 'Sabre\\VObject\\Property\\UtcOffset',
+        'TZOFFSETTO'    => 'Sabre\\VObject\\Property\\UtcOffset',
+        'TZURL'         => 'Sabre\\VObject\\Property\\Uri',
+
+        // Relationship Component Properties
+        'ATTENDEE'      => 'Sabre\\VObject\\Property\\ICalendar\\CalAddress',
+        'CONTACT'       => 'Sabre\\VObject\\Property\\FlatText',
+        'ORGANIZER'     => 'Sabre\\VObject\\Property\\ICalendar\\CalAddress',
+        'RECURRENCE-ID' => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'RELATED-TO'    => 'Sabre\\VObject\\Property\\FlatText',
+        'URL'           => 'Sabre\\VObject\\Property\\Uri',
+        'UID'           => 'Sabre\\VObject\\Property\\FlatText',
+
+        // Recurrence Component Properties
+        'EXDATE'        => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'RDATE'         => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'RRULE'         => 'Sabre\\VObject\\Property\\ICalendar\\Recur',
+        'EXRULE'        => 'Sabre\\VObject\\Property\\ICalendar\\Recur', // Deprecated since rfc5545
+
+        // Alarm Component Properties
+        'ACTION'        => 'Sabre\\VObject\\Property\\FlatText',
+        'REPEAT'        => 'Sabre\\VObject\\Property\\Integer',
+        'TRIGGER'       => 'Sabre\\VObject\\Property\\ICalendar\\Duration',
+
+        // Change Management Component Properties
+        'CREATED'       => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'DTSTAMP'       => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'LAST-MODIFIED' => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'SEQUENCE'      => 'Sabre\\VObject\\Property\\Integer',
+
+        // Request Status
+        'REQUEST-STATUS' => 'Sabre\\VObject\\Property\\Text',
+
+        // Additions from draft-daboo-valarm-extensions-04
+        'ALARM-AGENT'    => 'Sabre\\VObject\\Property\\Text',
+        'ACKNOWLEDGED'   => 'Sabre\\VObject\\Property\\ICalendar\\DateTime',
+        'PROXIMITY'      => 'Sabre\\VObject\\Property\\Text',
+        'DEFAULT-ALARM'  => 'Sabre\\VObject\\Property\\Boolean',
+
+    );
+
+    /**
+     * Returns the current document type.
+     *
+     * @return void
+     */
+    function getDocumentType() {
+
+        return self::ICALENDAR20;
+
+    }
+
+    /**
+     * Returns a list of all 'base components'. For instance, if an Event has
+     * a recurrence rule, and one instance is overridden, the overridden event
+     * will have the same UID, but will be excluded from this list.
+     *
+     * VTIMEZONE components will always be excluded.
+     *
+     * @param string $componentName filter by component name
+     * @return VObject\Component[]
+     */
+    function getBaseComponents($componentName = null) {
+
+        $components = array();
+        foreach($this->children as $component) {
+
+            if (!$component instanceof VObject\Component)
+                continue;
+
+            if (isset($component->{'RECURRENCE-ID'}))
+                continue;
+
+            if ($componentName && $component->name !== strtoupper($componentName))
+                continue;
+
+            if ($component->name === 'VTIMEZONE')
+                continue;
+
+            $components[] = $component;
+
+        }
+
+        return $components;
+
+    }
+
+    /**
+     * Returns the first component that is not a VTIMEZONE, and does not have
+     * an RECURRENCE-ID.
+     *
+     * If there is no such component, null will be returned.
+     *
+     * @param string $componentName filter by component name
+     * @return VObject\Component|null
+     */
+    function getBaseComponent($componentName = null) {
+
+        foreach($this->children as $component) {
+
+            if (!$component instanceof VObject\Component)
+                continue;
+
+            if (isset($component->{'RECURRENCE-ID'}))
+                continue;
+
+            if ($componentName && $component->name !== strtoupper($componentName))
+                continue;
+
+            if ($component->name === 'VTIMEZONE')
+                continue;
+
+            return $component;
+
+        }
+
+    }
+
+    /**
+     * If this calendar object, has events with recurrence rules, this method
+     * can be used to expand the event into multiple sub-events.
+     *
+     * Each event will be stripped from it's recurrence information, and only
+     * the instances of the event in the specified timerange will be left
+     * alone.
+     *
+     * In addition, this method will cause timezone information to be stripped,
+     * and normalized to UTC.
+     *
+     * This method will alter the VCalendar. This cannot be reversed.
+     *
+     * This functionality is specifically used by the CalDAV standard. It is
+     * possible for clients to request expand events, if they are rather simple
+     * clients and do not have the possibility to calculate recurrences.
+     *
+     * @param DateTime $start
+     * @param DateTime $end
+     * @param DateTimeZone $timeZone reference timezone for floating dates and
+     *                     times.
+     * @return void
+     */
+    function expand(DateTime $start, DateTime $end, DateTimeZone $timeZone = null) {
+
+        $newEvents = array();
+
+        if (!$timeZone) {
+            $timeZone = new DateTimeZone('UTC');
+        }
+
+        foreach($this->select('VEVENT') as $key=>$vevent) {
+
+            if (isset($vevent->{'RECURRENCE-ID'})) {
+                unset($this->children[$key]);
+                continue;
+            }
+
+
+            if (!$vevent->rrule) {
+                unset($this->children[$key]);
+                if ($vevent->isInTimeRange($start, $end)) {
+                    $newEvents[] = $vevent;
+                }
+                continue;
+            }
+
+
+
+            $uid = (string)$vevent->uid;
+            if (!$uid) {
+                throw new \LogicException('Event did not have a UID!');
+            }
+
+            try {
+                $it = new EventIterator($this, $vevent->uid, $timeZone);
+            } catch (NoInstancesException $e) {
+                // This event is recurring, but it doesn't have a single
+                // instance. We are skipping this event from the output
+                // entirely.
+                unset($this->children[$key]);
+                continue;
+            }
+            $it->fastForward($start);
+
+            while($it->valid() && $it->getDTStart() < $end) {
+
+                if ($it->getDTEnd() > $start) {
+
+                    $newEvents[] = $it->getEventObject();
+
+                }
+                $it->next();
+
+            }
+
+            unset($this->children[$key]);
+
+        }
+
+        // Setting all properties to UTC time.
+        foreach($newEvents as $newEvent) {
+
+            foreach($newEvent->children as $child) {
+                if ($child instanceof VObject\Property\ICalendar\DateTime && $child->hasTime()) {
+                    $dt = $child->getDateTimes($timeZone);
+                    // We only need to update the first timezone, because
+                    // setDateTimes will match all other timezones to the
+                    // first.
+                    $dt[0]->setTimeZone(new DateTimeZone('UTC'));
+                    $child->setDateTimes($dt);
+                }
+
+            }
+
+            $this->add($newEvent);
+
+        }
+
+        // Removing all VTIMEZONE components
+        unset($this->VTIMEZONE);
+
+    }
+
+    /**
+     * This method should return a list of default property values.
+     *
+     * @return array
+     */
+    protected function getDefaults() {
+
+        return array(
+            'VERSION' => '2.0',
+            'PRODID' => '-//Sabre//Sabre VObject ' . VObject\Version::VERSION . '//EN',
+            'CALSCALE' => 'GREGORIAN',
+        );
+
+    }
+
+    /**
+     * A simple list of validation rules.
+     *
+     * This is simply a list of properties, and how many times they either
+     * must or must not appear.
+     *
+     * Possible values per property:
+     *   * 0 - Must not appear.
+     *   * 1 - Must appear exactly once.
+     *   * + - Must appear at least once.
+     *   * * - Can appear any number of times.
+     *
+     * @var array
+     */
+    function getValidationRules() {
+
+        return array(
+            'PRODID' => 1,
+            'VERSION' => 1,
+
+            'CALSCALE' => '?',
+            'METHOD' => '?',
+        );
+
+    }
+
+    /**
+     * Validates the node for correctness.
+     *
+     * The following options are supported:
+     *   Node::REPAIR - May attempt to automatically repair the problem.
+     *   Node::PROFILE_CARDDAV - Validate the vCard for CardDAV purposes.
+     *   Node::PROFILE_CALDAV - Validate the iCalendar for CalDAV purposes.
+     *
+     * This method returns an array with detected problems.
+     * Every element has the following properties:
+     *
+     *  * level - problem level.
+     *  * message - A human-readable string describing the issue.
+     *  * node - A reference to the problematic node.
+     *
+     * The level means:
+     *   1 - The issue was repaired (only happens if REPAIR was turned on).
+     *   2 - A warning.
+     *   3 - An error.
+     *
+     * @param int $options
+     * @return array
+     */
+    function validate($options = 0) {
+
+        $warnings = parent::validate($options);
+
+        if ($ver = $this->VERSION) {
+            if ((string)$ver !== '2.0') {
+                $warnings[] = array(
+                    'level' => 3,
+                    'message' => 'Only iCalendar version 2.0 as defined in rfc5545 is supported.',
+                    'node' => $this,
+                );
+            }
+
+        }
+
+        $uidList = array();
+
+        $componentsFound = 0;
+
+        $componentTypes = array();
+
+        foreach($this->children as $child) {
+            if($child instanceof Component) {
+                $componentsFound++;
+
+                if (!in_array($child->name, array('VEVENT', 'VTODO', 'VJOURNAL'))) {
+                    continue;
+                }
+                $componentTypes[] = $child->name;
+
+                $uid = (string)$child->UID;
+                $isMaster = isset($child->{'RECURRENCE-ID'})?0:1;
+                if (isset($uidList[$uid])) {
+                    $uidList[$uid]['count']++;
+                    if ($isMaster && $uidList[$uid]['hasMaster']) {
+                        $warnings[] = array(
+                            'level' => 3,
+                            'message' => 'More than one master object was found for the object with UID ' . $uid,
+                            'node' => $this,
+                        );
+                    }
+                    $uidList[$uid]['hasMaster']+=$isMaster;
+                } else {
+                    $uidList[$uid] = array(
+                        'count' => 1,
+                        'hasMaster' => $isMaster,
+                    );
+                }
+
+            }
+        }
+
+        if ($componentsFound===0) {
+            $warnings[] = array(
+                'level' => 3,
+                'message' => 'An iCalendar object must have at least 1 component.',
+                'node' => $this,
+            );
+        }
+
+        if ($options & self::PROFILE_CALDAV) {
+            if (count($uidList)>1) {
+                $warnings[] = array(
+                    'level' => 3,
+                    'message' => 'A calendar object on a CalDAV server may only have components with the same UID.',
+                    'node' => $this,
+                );
+            }
+            if (count(array_unique($componentTypes))===0) {
+                $warnings[] = array(
+                    'level' => 3,
+                    'message' => 'A calendar object on a CalDAV server must have at least 1 component (VTODO, VEVENT, VJOURNAL).',
+                    'node' => $this,
+                );
+            }
+            if (count(array_unique($componentTypes))>1) {
+                $warnings[] = array(
+                    'level' => 3,
+                    'message' => 'A calendar object on a CalDAV server may only have 1 type of component (VEVENT, VTODO or VJOURNAL).',
+                    'node' => $this,
+                );
+            }
+
+            if (isset($this->METHOD)) {
+                $warnings[] = array(
+                    'level' => 3,
+                    'message' => 'A calendar object on a CalDAV server MUST NOT have a METHOD property.',
+                    'node' => $this,
+                );
+            }
+        }
+
+        return $warnings;
+
+    }
+
+}
+