--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/lib/Node.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,226 @@
+<?php
+
+namespace Sabre\VObject;
+
+/**
+ * A node is the root class for every element in an iCalendar of vCard object.
+ *
+ * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class Node implements \IteratorAggregate, \ArrayAccess, \Countable {
+
+    /**
+     * The following constants are used by the validate() method.
+     *
+     * If REPAIR is set, the validator will attempt to repair any broken data
+     * (if possible).
+     */
+    const REPAIR = 1;
+
+    /**
+     * If this option is set, the validator will operate on the vcards on the
+     * assumption that the vcards need to be valid for CardDAV.
+     *
+     * This means for example that the UID is required, whereas it is not for
+     * regular vcards.
+     */
+    const PROFILE_CARDDAV = 2;
+
+    /**
+     * If this option is set, the validator will operate on iCalendar objects
+     * on the assumption that the vcards need to be valid for CalDAV.
+     *
+     * This means for example that calendars can only contain objects with
+     * identical component types and UIDs.
+     */
+    const PROFILE_CALDAV = 4;
+
+    /**
+     * Reference to the parent object, if this is not the top object.
+     *
+     * @var Node
+     */
+    public $parent;
+
+    /**
+     * Iterator override
+     *
+     * @var ElementList
+     */
+    protected $iterator = null;
+
+    /**
+     * The root document
+     *
+     * @var Component
+     */
+    protected $root;
+
+    /**
+     * Serializes the node into a mimedir format
+     *
+     * @return string
+     */
+    abstract public function serialize();
+
+    /**
+     * This method returns an array, with the representation as it should be
+     * encoded in json. This is used to create jCard or jCal documents.
+     *
+     * @return array
+     */
+    abstract public function jsonSerialize();
+
+    /* {{{ IteratorAggregator interface */
+
+    /**
+     * Returns the iterator for this object
+     *
+     * @return ElementList
+     */
+    public function getIterator() {
+
+        if (!is_null($this->iterator))
+            return $this->iterator;
+
+        return new ElementList(array($this));
+
+    }
+
+    /**
+     * Sets the overridden iterator
+     *
+     * Note that this is not actually part of the iterator interface
+     *
+     * @param ElementList $iterator
+     * @return void
+     */
+    public function setIterator(ElementList $iterator) {
+
+        $this->iterator = $iterator;
+
+    }
+
+    /**
+     * Validates the node for correctness.
+     *
+     * The following options are supported:
+     *   Node::REPAIR - May attempt to automatically repair the problem.
+     *
+     * 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 - An inconsequential issue
+     *   3 - A severe issue.
+     *
+     * @param int $options
+     * @return array
+     */
+    public function validate($options = 0) {
+
+        return array();
+
+    }
+
+    /* }}} */
+
+    /* {{{ Countable interface */
+
+    /**
+     * Returns the number of elements
+     *
+     * @return int
+     */
+    public function count() {
+
+        $it = $this->getIterator();
+        return $it->count();
+
+    }
+
+    /* }}} */
+
+    /* {{{ ArrayAccess Interface */
+
+
+    /**
+     * Checks if an item exists through ArrayAccess.
+     *
+     * This method just forwards the request to the inner iterator
+     *
+     * @param int $offset
+     * @return bool
+     */
+    public function offsetExists($offset) {
+
+        $iterator = $this->getIterator();
+        return $iterator->offsetExists($offset);
+
+    }
+
+    /**
+     * Gets an item through ArrayAccess.
+     *
+     * This method just forwards the request to the inner iterator
+     *
+     * @param int $offset
+     * @return mixed
+     */
+    public function offsetGet($offset) {
+
+        $iterator = $this->getIterator();
+        return $iterator->offsetGet($offset);
+
+    }
+
+    /**
+     * Sets an item through ArrayAccess.
+     *
+     * This method just forwards the request to the inner iterator
+     *
+     * @param int $offset
+     * @param mixed $value
+     * @return void
+     */
+    public function offsetSet($offset, $value) {
+
+        $iterator = $this->getIterator();
+        $iterator->offsetSet($offset,$value);
+
+    // @codeCoverageIgnoreStart
+    //
+    // This method always throws an exception, so we ignore the closing
+    // brace
+    }
+    // @codeCoverageIgnoreEnd
+
+    /**
+     * Sets an item through ArrayAccess.
+     *
+     * This method just forwards the request to the inner iterator
+     *
+     * @param int $offset
+     * @return void
+     */
+    public function offsetUnset($offset) {
+
+        $iterator = $this->getIterator();
+        $iterator->offsetUnset($offset);
+
+    // @codeCoverageIgnoreStart
+    //
+    // This method always throws an exception, so we ignore the closing
+    // brace
+    }
+    // @codeCoverageIgnoreEnd
+
+    /* }}} */
+}