--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/lib/Component/VAlarm.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,136 @@
+<?php
+
+namespace Sabre\VObject\Component;
+use Sabre\VObject;
+
+/**
+ * VAlarm component
+ *
+ * This component contains some additional functionality specific for VALARMs.
+ *
+ * @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 VAlarm extends VObject\Component {
+
+    /**
+     * Returns a DateTime object when this alarm is going to trigger.
+     *
+     * This ignores repeated alarm, only the first trigger is returned.
+     *
+     * @return DateTime
+     */
+    public function getEffectiveTriggerTime() {
+
+        $trigger = $this->TRIGGER;
+        if(!isset($trigger['VALUE']) || strtoupper($trigger['VALUE']) === 'DURATION') {
+            $triggerDuration = VObject\DateTimeParser::parseDuration($this->TRIGGER);
+            $related = (isset($trigger['RELATED']) && strtoupper($trigger['RELATED']) == 'END') ? 'END' : 'START';
+
+            $parentComponent = $this->parent;
+            if ($related === 'START') {
+
+                if ($parentComponent->name === 'VTODO') {
+                    $propName = 'DUE';
+                } else {
+                    $propName = 'DTSTART';
+                }
+
+                $effectiveTrigger = clone $parentComponent->$propName->getDateTime();
+                $effectiveTrigger->add($triggerDuration);
+            } else {
+                if ($parentComponent->name === 'VTODO') {
+                    $endProp = 'DUE';
+                } elseif ($parentComponent->name === 'VEVENT') {
+                    $endProp = 'DTEND';
+                } else {
+                    throw new \LogicException('time-range filters on VALARM components are only supported when they are a child of VTODO or VEVENT');
+                }
+
+                if (isset($parentComponent->$endProp)) {
+                    $effectiveTrigger = clone $parentComponent->$endProp->getDateTime();
+                    $effectiveTrigger->add($triggerDuration);
+                } elseif (isset($parentComponent->DURATION)) {
+                    $effectiveTrigger = clone $parentComponent->DTSTART->getDateTime();
+                    $duration = VObject\DateTimeParser::parseDuration($parentComponent->DURATION);
+                    $effectiveTrigger->add($duration);
+                    $effectiveTrigger->add($triggerDuration);
+                } else {
+                    $effectiveTrigger = clone $parentComponent->DTSTART->getDateTime();
+                    $effectiveTrigger->add($triggerDuration);
+                }
+            }
+        } else {
+            $effectiveTrigger = $trigger->getDateTime();
+        }
+        return $effectiveTrigger;
+
+    }
+
+    /**
+     * Returns true or false depending on if the event falls in the specified
+     * time-range. This is used for filtering purposes.
+     *
+     * The rules used to determine if an event falls within the specified
+     * time-range is based on the CalDAV specification.
+     *
+     * @param \DateTime $start
+     * @param \DateTime $end
+     * @return bool
+     */
+    public function isInTimeRange(\DateTime $start, \DateTime $end) {
+
+        $effectiveTrigger = $this->getEffectiveTriggerTime();
+
+        if (isset($this->DURATION)) {
+            $duration = VObject\DateTimeParser::parseDuration($this->DURATION);
+            $repeat = (string)$this->repeat;
+            if (!$repeat) {
+                $repeat = 1;
+            }
+
+            $period = new \DatePeriod($effectiveTrigger, $duration, (int)$repeat);
+
+            foreach($period as $occurrence) {
+
+                if ($start <= $occurrence && $end > $occurrence) {
+                    return true;
+                }
+            }
+            return false;
+        } else {
+            return ($start <= $effectiveTrigger && $end > $effectiveTrigger);
+        }
+
+    }
+
+    /**
+     * 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
+     */
+    public function getValidationRules() {
+
+        return array(
+            'ACTION' => 1,
+            'TRIGGER' => 1,
+
+            'DURATION' => '?',
+            'REPEAT' => '?',
+
+            'ATTACH' => '?',
+        );
+
+    }
+
+}