--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/sabre/vobject/lib/Component.php	Sat Jan 13 09:06:10 2018 -0500
@@ -0,0 +1,595 @@
+<?php
+
+namespace Sabre\VObject;
+
+/**
+ * Component
+ *
+ * A component represents a group of properties, such as VCALENDAR, VEVENT, or
+ * VCARD.
+ *
+ * @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 Component extends Node {
+
+    /**
+     * Component name.
+     *
+     * This will contain a string such as VEVENT, VTODO, VCALENDAR, VCARD.
+     *
+     * @var string
+     */
+    public $name;
+
+    /**
+     * A list of properties and/or sub-components.
+     *
+     * @var array
+     */
+    public $children = array();
+
+    /**
+     * Creates a new component.
+     *
+     * You can specify the children either in key=>value syntax, in which case
+     * properties will automatically be created, or you can just pass a list of
+     * Component and Property object.
+     *
+     * By default, a set of sensible values will be added to the component. For
+     * an iCalendar object, this may be something like CALSCALE:GREGORIAN. To
+     * ensure that this does not happen, set $defaults to false.
+     *
+     * @param Document $root
+     * @param string $name such as VCALENDAR, VEVENT.
+     * @param array $children
+     * @param bool $defaults
+     * @return void
+     */
+    function __construct(Document $root, $name, array $children = array(), $defaults = true) {
+
+        $this->name = strtoupper($name);
+        $this->root = $root;
+
+        if ($defaults) {
+            // This is a terribly convoluted way to do this, but this ensures
+            // that the order of properties as they are specified in both
+            // defaults and the childrens list, are inserted in the object in a
+            // natural way.
+            $list = $this->getDefaults();
+            $nodes = array();
+            foreach($children as $key=>$value) {
+                if ($value instanceof Node) {
+                    if (isset($list[$value->name])) {
+                        unset($list[$value->name]);
+                    }
+                    $nodes[] = $value;
+                } else {
+                    $list[$key] = $value;
+                }
+            }
+            foreach($list as $key=>$value) {
+                $this->add($key, $value);
+            }
+            foreach($nodes as $node) {
+                $this->add($node);
+            }
+        } else {
+            foreach($children as $k=>$child) {
+                if ($child instanceof Node) {
+
+                    // Component or Property
+                    $this->add($child);
+                } else {
+
+                    // Property key=>value
+                    $this->add($k, $child);
+                }
+            }
+        }
+
+    }
+
+    /**
+     * Adds a new property or component, and returns the new item.
+     *
+     * This method has 3 possible signatures:
+     *
+     * add(Component $comp) // Adds a new component
+     * add(Property $prop)  // Adds a new property
+     * add($name, $value, array $parameters = array()) // Adds a new property
+     * add($name, array $children = array()) // Adds a new component
+     * by name.
+     *
+     * @return Node
+     */
+    function add($a1, $a2 = null, $a3 = null) {
+
+        if ($a1 instanceof Node) {
+            if (!is_null($a2)) {
+                throw new \InvalidArgumentException('The second argument must not be specified, when passing a VObject Node');
+            }
+            $a1->parent = $this;
+            $this->children[] = $a1;
+
+            return $a1;
+
+        } elseif(is_string($a1)) {
+
+            $item = $this->root->create($a1, $a2, $a3);
+            $item->parent = $this;
+            $this->children[] = $item;
+
+            return $item;
+
+        } else {
+
+            throw new \InvalidArgumentException('The first argument must either be a \\Sabre\\VObject\\Node or a string');
+
+        }
+
+    }
+
+    /**
+     * This method removes a component or property from this component.
+     *
+     * You can either specify the item by name (like DTSTART), in which case
+     * all properties/components with that name will be removed, or you can
+     * pass an instance of a property or component, in which case only that
+     * exact item will be removed.
+     *
+     * The removed item will be returned. In case there were more than 1 items
+     * removed, only the last one will be returned.
+     *
+     * @param mixed $item
+     * @return void
+     */
+    function remove($item) {
+
+        if (is_string($item)) {
+            $children = $this->select($item);
+            foreach($children as $k=>$child) {
+                unset($this->children[$k]);
+            }
+            return $child;
+        } else {
+            foreach($this->children as $k => $child) {
+                if ($child===$item) {
+                    unset($this->children[$k]);
+                    return $child;
+                }
+            }
+
+            throw new \InvalidArgumentException('The item you passed to remove() was not a child of this component');
+
+        }
+
+    }
+
+    /**
+     * Returns an iterable list of children
+     *
+     * @return array
+     */
+    function children() {
+
+        return $this->children;
+
+    }
+
+    /**
+     * This method only returns a list of sub-components. Properties are
+     * ignored.
+     *
+     * @return array
+     */
+    function getComponents() {
+
+        $result = array();
+        foreach($this->children as $child) {
+            if ($child instanceof Component) {
+                $result[] = $child;
+            }
+        }
+
+        return $result;
+
+    }
+
+    /**
+     * Returns an array with elements that match the specified name.
+     *
+     * This function is also aware of MIME-Directory groups (as they appear in
+     * vcards). This means that if a property is grouped as "HOME.EMAIL", it
+     * will also be returned when searching for just "EMAIL". If you want to
+     * search for a property in a specific group, you can select on the entire
+     * string ("HOME.EMAIL"). If you want to search on a specific property that
+     * has not been assigned a group, specify ".EMAIL".
+     *
+     * Keys are retained from the 'children' array, which may be confusing in
+     * certain cases.
+     *
+     * @param string $name
+     * @return array
+     */
+    function select($name) {
+
+        $group = null;
+        $name = strtoupper($name);
+        if (strpos($name,'.')!==false) {
+            list($group,$name) = explode('.', $name, 2);
+        }
+
+        $result = array();
+        foreach($this->children as $key=>$child) {
+
+            if (
+                (
+                    strtoupper($child->name) === $name
+                    && (is_null($group) || ( $child instanceof Property && strtoupper($child->group) === $group))
+                )
+                ||
+                (
+                    $name === '' && $child instanceof Property && strtoupper($child->group) === $group
+                )
+            ) {
+
+                $result[$key] = $child;
+
+            }
+        }
+
+        reset($result);
+        return $result;
+
+    }
+
+    /**
+     * Turns the object back into a serialized blob.
+     *
+     * @return string
+     */
+    function serialize() {
+
+        $str = "BEGIN:" . $this->name . "\r\n";
+
+        /**
+         * Gives a component a 'score' for sorting purposes.
+         *
+         * This is solely used by the childrenSort method.
+         *
+         * A higher score means the item will be lower in the list.
+         * To avoid score collisions, each "score category" has a reasonable
+         * space to accomodate elements. The $key is added to the $score to
+         * preserve the original relative order of elements.
+         *
+         * @param int $key
+         * @param array $array
+         * @return int
+         */
+        $sortScore = function($key, $array) {
+
+            if ($array[$key] instanceof Component) {
+
+                // We want to encode VTIMEZONE first, this is a personal
+                // preference.
+                if ($array[$key]->name === 'VTIMEZONE') {
+                    $score=300000000;
+                    return $score+$key;
+                } else {
+                    $score=400000000;
+                    return $score+$key;
+                }
+            } else {
+                // Properties get encoded first
+                // VCARD version 4.0 wants the VERSION property to appear first
+                if ($array[$key] instanceof Property) {
+                    if ($array[$key]->name === 'VERSION') {
+                        $score=100000000;
+                        return $score+$key;
+                    } else {
+                        // All other properties
+                        $score=200000000;
+                        return $score+$key;
+                    }
+                }
+            }
+
+        };
+
+        $tmp = $this->children;
+        uksort(
+            $this->children,
+            function($a, $b) use ($sortScore, $tmp) {
+
+                $sA = $sortScore($a, $tmp);
+                $sB = $sortScore($b, $tmp);
+
+                return $sA - $sB;
+
+            }
+        );
+
+        foreach($this->children as $child) $str.=$child->serialize();
+        $str.= "END:" . $this->name . "\r\n";
+
+        return $str;
+
+    }
+
+    /**
+     * 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
+     */
+    function jsonSerialize() {
+
+        $components = array();
+        $properties = array();
+
+        foreach($this->children as $child) {
+            if ($child instanceof Component) {
+                $components[] = $child->jsonSerialize();
+            } else {
+                $properties[] = $child->jsonSerialize();
+            }
+        }
+
+        return array(
+            strtolower($this->name),
+            $properties,
+            $components
+        );
+
+    }
+
+    /**
+     * This method should return a list of default property values.
+     *
+     * @return array
+     */
+    protected function getDefaults() {
+
+        return array();
+
+    }
+
+    /* Magic property accessors {{{ */
+
+    /**
+     * Using 'get' you will either get a property or component.
+     *
+     * If there were no child-elements found with the specified name,
+     * null is returned.
+     *
+     * To use this, this may look something like this:
+     *
+     * $event = $calendar->VEVENT;
+     *
+     * @param string $name
+     * @return Property
+     */
+    function __get($name) {
+
+        $matches = $this->select($name);
+        if (count($matches)===0) {
+            return null;
+        } else {
+            $firstMatch = current($matches);
+            /** @var $firstMatch Property */
+            $firstMatch->setIterator(new ElementList(array_values($matches)));
+            return $firstMatch;
+        }
+
+    }
+
+    /**
+     * This method checks if a sub-element with the specified name exists.
+     *
+     * @param string $name
+     * @return bool
+     */
+    function __isset($name) {
+
+        $matches = $this->select($name);
+        return count($matches)>0;
+
+    }
+
+    /**
+     * Using the setter method you can add properties or subcomponents
+     *
+     * You can either pass a Component, Property
+     * object, or a string to automatically create a Property.
+     *
+     * If the item already exists, it will be removed. If you want to add
+     * a new item with the same name, always use the add() method.
+     *
+     * @param string $name
+     * @param mixed $value
+     * @return void
+     */
+    function __set($name, $value) {
+
+        $matches = $this->select($name);
+        $overWrite = count($matches)?key($matches):null;
+
+        if ($value instanceof Component || $value instanceof Property) {
+            $value->parent = $this;
+            if (!is_null($overWrite)) {
+                $this->children[$overWrite] = $value;
+            } else {
+                $this->children[] = $value;
+            }
+        } else {
+            $property = $this->root->create($name,$value);
+            $property->parent = $this;
+            if (!is_null($overWrite)) {
+                $this->children[$overWrite] = $property;
+            } else {
+                $this->children[] = $property;
+            }
+        }
+    }
+
+    /**
+     * Removes all properties and components within this component with the
+     * specified name.
+     *
+     * @param string $name
+     * @return void
+     */
+    function __unset($name) {
+
+        $matches = $this->select($name);
+        foreach($matches as $k=>$child) {
+
+            unset($this->children[$k]);
+            $child->parent = null;
+
+        }
+
+    }
+
+    /* }}} */
+
+    /**
+     * This method is automatically called when the object is cloned.
+     * Specifically, this will ensure all child elements are also cloned.
+     *
+     * @return void
+     */
+    function __clone() {
+
+        foreach($this->children as $key=>$child) {
+            $this->children[$key] = clone $child;
+            $this->children[$key]->parent = $this;
+        }
+
+    }
+
+    /**
+     * 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.
+     *   * ? - May appear, but not more than once.
+     *
+     * It is also possible to specify defaults and severity levels for
+     * violating the rule.
+     *
+     * See the VEVENT implementation for getValidationRules for a more complex
+     * example.
+     *
+     * @var array
+     */
+    function getValidationRules() {
+
+        return array();
+
+    }
+
+    /**
+     * 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) {
+
+        $rules = $this->getValidationRules();
+        $defaults = $this->getDefaults();
+
+        $propertyCounters = array();
+
+        $messages = array();
+
+        foreach($this->children as $child) {
+            $name = strtoupper($child->name);
+            if (!isset($propertyCounters[$name])) {
+                $propertyCounters[$name] = 1;
+            } else {
+                $propertyCounters[$name]++;
+            }
+            $messages = array_merge($messages, $child->validate($options));
+        }
+
+        foreach($rules as $propName => $rule) {
+
+            switch($rule) {
+                case '0' :
+                    if (isset($propertyCounters[$propName])) {
+                        $messages[] = array(
+                            'level' => 3,
+                            'message' => $propName . ' MUST NOT appear in a ' . $this->name . ' component',
+                            'node' => $this,
+                        );
+                    }
+                    break;
+                case '1' :
+                    if (!isset($propertyCounters[$propName]) || $propertyCounters[$propName]!==1) {
+                        $repaired = false;
+                        if ($options & self::REPAIR && isset($defaults[$propName])) {
+                            $this->add($propName, $defaults[$propName]);
+                        }
+                        $messages[] = array(
+                            'level' => $repaired?1:3,
+                            'message' => $propName . ' MUST appear exactly once in a ' . $this->name . ' component',
+                            'node' => $this,
+                        );
+                    }
+                    break;
+                case '+' :
+                    if (!isset($propertyCounters[$propName]) || $propertyCounters[$propName] < 1) {
+                        $messages[] = array(
+                            'level' => 3,
+                            'message' => $propName . ' MUST appear at least once in a ' . $this->name . ' component',
+                            'node' => $this,
+                        );
+                    }
+                    break;
+                case '*' :
+                    break;
+                case '?' :
+                    if (isset($propertyCounters[$propName]) && $propertyCounters[$propName] > 1) {
+                        $messages[] = array(
+                            'level' => 3,
+                            'message' => $propName . ' MUST NOT appear more than once in a ' . $this->name . ' component',
+                            'node' => $this,
+                        );
+                    }
+                    break;
+
+            }
+
+        }
+        return $messages;
+
+    }
+
+}