Revert "composer updates"

This reverts commit dbfe748d274f6843fc91a3071df7be45c4ab5b00

21 files changed, 644 insertions, 282 deletions

diff --git a/vendor/sabre/event/.gitattributes b/vendor/sabre/event/.gitattributes
new file mode 100644
index 000000000..0fdd4b01c
--- /dev/null
+++ b/vendor/sabre/event/.gitattributes
@@ -0,0 +1,2 @@
+/examples          export-ignore
+/tests             export-ignore
diff --git a/vendor/sabre/event/.gitignore b/vendor/sabre/event/.gitignore
new file mode 100644
index 000000000..d06a78164
--- /dev/null
+++ b/vendor/sabre/event/.gitignore
@@ -0,0 +1,14 @@
+#composer
+vendor
+composer.lock
+
+#binaries
+bin/sabre-cs-fixer
+bin/php-cs-fixer
+bin/phpunit
+
+#vim lock files
+.*.swp
+
+#development stuff
+tests/cov
diff --git a/vendor/sabre/event/.travis.yml b/vendor/sabre/event/.travis.yml
new file mode 100644
index 000000000..020488b79
--- /dev/null
+++ b/vendor/sabre/event/.travis.yml
@@ -0,0 +1,21 @@
+language: php
+php:
+  - 7.0
+  - 7.1
+  - 7.2
+
+env:
+  matrix:
+    - LOWEST_DEPS=""
+    - LOWEST_DEPS="--prefer-lowest"
+
+before_script:
+  - composer update --prefer-source $LOWEST_DEPS
+
+script:
+  - ./bin/phpunit
+  - ./bin/sabre-cs-fixer fix . --dry-run --diff
+
+sudo: false
+
+cache: vendor
diff --git a/vendor/sabre/event/CHANGELOG.md b/vendor/sabre/event/CHANGELOG.md
new file mode 100644
index 000000000..5b1fb2e68
--- /dev/null
+++ b/vendor/sabre/event/CHANGELOG.md
@@ -0,0 +1,122 @@
+ChangeLog
+=========
+5.0.3 (2018-05-03)
+------------------
+
+* Dropped remaining hhvm leftovers.
+* #55: Fixed typo in WildcardEmitterTrait (@SamMousa)
+* #54: export-ignore examples & tests in distribution (@staabm)
+
+5.0.2 (2017-04-29)
+------------------
+
+* #50: Fixed Promise\all to resolve immediately for empty arrays (@MadHed)
+* #48, #49: Performance optimisations for EmitterTrait and WildcardEmitterTrait (@lunixyacht).
+
+5.0.1 (2016-10-29)
+------------------
+
+* #45: Fixed `Emitter` class to use the correct interface. (@felixfbecker).
+
+
+5.0.0 (2016-10-23)
+------------------
+
+* #42: The `coroutine` function now supports `return` in the passed generator
+  function. This allows you to more generally return a value. This is a BC
+  break as this is a feature that was only made possible with PHP 7, and
+  before the coroutine function would only ever return the last thing that
+  was yielded. If you depended on that feature, replace your last `yield` with
+  a `return`.
+
+
+4.0.0 (2016-09-19)
+------------------
+
+* sabre/event now requires PHP 7. If you need PHP 5.5 support, just keep
+  using 3.0.0.
+* PHP 7 type hints are now used everywhere. We're also using strict_types.
+* Support for a new `WildcardEmitter` which allows you to listen for events
+  using the `*` wildcard.
+* Removed deprecated functions `Promise::error` and `Promise::all`. Instead,
+  use `Promise::otherwise` and `Promise\all()`.
+* `EventEmitter`, `EventEmitterTrait` and `EventEmitterInterface` are now just
+  called `Emitter`, `EmitterTrait`, and `EmitterInterface`.
+* When rejecting Promises, it's now _required_ to use an `Exception` or
+  `Throwable`. This makes the typical case simpler and reduces special cases.
+
+3.0.0 (2015-11-05)
+------------------
+
+* Now requires PHP 5.5!
+* `Promise::all()` is moved to `Promise\all()`.
+* Aside from the `Promise\all()` function, there's now also `Promise\race()`.
+* `Promise\reject()` and `Promise\resolve()` have also been added.
+* Now 100% compatible with the Ecmascript 6 Promise.
+
+
+3.0.0-alpha1 (2015-10-23)
+-------------------------
+
+* This package now requires PHP 5.5.
+* #26: Added an event loop implementation. Also knows as the Reactor Pattern.
+* Renamed `Promise::error` to `Promise::otherwise` to be consistent with
+  ReactPHP and Guzzle. The `error` method is kept for BC but will be removed
+  in a future version.
+* #27: Support for Promise-based coroutines via the `Sabre\Event\coroutine`
+  function.
+* BC Break: Promises now use the EventLoop to run "then"-events in a separate
+  execution context. In practise that means you need to run the event loop to
+  wait for any `then`/`otherwise` callbacks to trigger.
+* Promises now have a `wait()` method. Allowing you to make a promise
+  synchronous and simply wait for a result (or exception) to happen.
+
+
+2.0.2 (2015-05-19)
+------------------
+
+* This release has no functional changes. It's just been brought up to date
+  with the latest coding standards.
+
+
+2.0.1 (2014-10-06)
+------------------
+
+* Fixed: `$priority` was ignored in `EventEmitter::once` method.
+* Fixed: Breaking the event chain was not possible in `EventEmitter::once`.
+
+
+2.0.0 (2014-06-21)
+------------------
+
+* Added: When calling emit, it's now possible to specify a callback that will be
+  triggered after each method handled. This is dubbed the 'continueCallback' and
+  can be used to implement strategy patterns.
+* Added: Promise object!
+* Changed: EventEmitter::listeners now returns just the callbacks for an event,
+  and no longer returns the list by reference. The list is now automatically
+  sorted by priority.
+* Update: Speed improvements.
+* Updated: It's now possible to remove all listeners for every event.
+* Changed: Now uses psr-4 autoloading.
+
+
+1.0.1 (2014-06-12)
+------------------
+
+* hhvm compatible!
+* Fixed: Issue #4. Compatiblitiy for PHP < 5.4.14.
+
+
+1.0.0 (2013-07-19)
+------------------
+
+* Added: removeListener, removeAllListeners
+* Added: once, to only listen to an event emitting once.
+* Added README.md.
+
+
+0.0.1-alpha (2013-06-29)
+------------------------
+
+* First version!
diff --git a/vendor/sabre/event/README.md b/vendor/sabre/event/README.md
new file mode 100644
index 000000000..9e2bdd042
--- /dev/null
+++ b/vendor/sabre/event/README.md
@@ -0,0 +1,51 @@
+sabre/event
+===========
+
+A lightweight library for event-based development in PHP.
+
+This library provides the following event-based concepts:
+
+1. EventEmitter.
+2. Promises.
+3. An event loop.
+4. Co-routines.
+
+Full documentation can be found on [the website][1].
+
+Installation
+------------
+
+Make sure you have [composer][3] installed, and then run:
+
+    composer require sabre/event "^3.0"
+
+This package requires PHP 5.5. The 2.0 branch is still maintained as well, and
+supports PHP 5.4.
+
+Build status
+------------
+
+| branch | status |
+| ------ | ------ |
+| master | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=master)](https://travis-ci.org/sabre-io/event) |
+| 3.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
+| 2.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=2.0)](https://travis-ci.org/sabre-io/event) |
+| 1.0    | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=1.0)](https://travis-ci.org/sabre-io/event) |
+| php53  | [![Build Status](https://travis-ci.org/sabre-io/event.svg?branch=php53)](https://travis-ci.org/sabre-io/event) |
+
+
+Questions?
+----------
+
+Head over to the [sabre/dav mailinglist][4], or you can also just open a ticket
+on [GitHub][5].
+
+Made at fruux
+-------------
+
+This library is being developed by [fruux](https://fruux.com/). Drop us a line for commercial services or enterprise support.
+
+[1]: http://sabre.io/event/
+[3]: http://getcomposer.org/
+[4]: http://groups.google.com/group/sabredav-discuss
+[5]: https://github.com/fruux/sabre-event/issues/
diff --git a/vendor/sabre/event/_config.yml b/vendor/sabre/event/_config.yml
new file mode 100644
index 000000000..c4192631f
--- /dev/null
+++ b/vendor/sabre/event/_config.yml
@@ -0,0 +1 @@
+theme: jekyll-theme-cayman
\ No newline at end of file
diff --git a/vendor/sabre/event/composer.json b/vendor/sabre/event/composer.json
index 144704118..d7a13c5ca 100644
--- a/vendor/sabre/event/composer.json
+++ b/vendor/sabre/event/composer.json
@@ -16,7 +16,7 @@
     "homepage": "http://sabre.io/event/",
     "license": "BSD-3-Clause",
     "require": {
-        "php": "^7.1"
+        "php": ">=7.0"
     },
     "authors": [
         {
@@ -41,8 +41,8 @@
         ]
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "~2.16.1",
-        "phpunit/phpunit" : "^7 || ^8"
+        "sabre/cs": "~1.0.0",
+        "phpunit/phpunit" : ">=6"
     },
     "config" : {
         "bin-dir" : "bin/"
diff --git a/vendor/sabre/event/lib/Emitter.php b/vendor/sabre/event/lib/Emitter.php
index e1f23fc87..ab5e8c90e 100644
--- a/vendor/sabre/event/lib/Emitter.php
+++ b/vendor/sabre/event/lib/Emitter.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -13,7 +11,8 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Emitter implements EmitterInterface
-{
+class Emitter implements EmitterInterface {
+
     use EmitterTrait;
+
 }
diff --git a/vendor/sabre/event/lib/EmitterInterface.php b/vendor/sabre/event/lib/EmitterInterface.php
index 6ce0f34db..a7e4b6132 100644
--- a/vendor/sabre/event/lib/EmitterInterface.php
+++ b/vendor/sabre/event/lib/EmitterInterface.php
@@ -1,11 +1,9 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Event Emitter Interface.
+ * Event Emitter Interface
  *
  * Anything that accepts listeners and emits events should implement this
  * interface.
@@ -14,22 +12,26 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface EmitterInterface
-{
+interface EmitterInterface {
+
     /**
      * Subscribe to an event.
+     *
+     * @return void
      */
-    public function on(string $eventName, callable $callBack, int $priority = 100);
+    function on(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Subscribe to an event exactly once.
+     *
+     * @return void
      */
-    public function once(string $eventName, callable $callBack, int $priority = 100);
+    function once(string $eventName, callable $callBack, int $priority = 100);
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were successfully
+     * This method will return true if 0 or more listeners were succesfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -47,7 +49,7 @@ interface EmitterInterface
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool;
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool;
 
     /**
      * Returns the list of listeners for an event.
@@ -57,7 +59,7 @@ interface EmitterInterface
      *
      * @return callable[]
      */
-    public function listeners(string $eventName): array;
+    function listeners(string $eventName) : array;
 
     /**
      * Removes a specific listener from an event.
@@ -65,7 +67,7 @@ interface EmitterInterface
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    public function removeListener(string $eventName, callable $listener): bool;
+    function removeListener(string $eventName, callable $listener) : bool;
 
     /**
      * Removes all listeners.
@@ -73,6 +75,9 @@ interface EmitterInterface
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
+     *
+     * @return void
      */
-    public function removeAllListeners(string $eventName = null);
+    function removeAllListeners(string $eventName = null);
+
 }
diff --git a/vendor/sabre/event/lib/EmitterTrait.php b/vendor/sabre/event/lib/EmitterTrait.php
index 5502ef9f3..dafae362f 100644
--- a/vendor/sabre/event/lib/EmitterTrait.php
+++ b/vendor/sabre/event/lib/EmitterTrait.php
@@ -1,11 +1,9 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Event Emitter Trait.
+ * Event Emitter Trait
  *
  * This trait contains all the basic functions to implement an
  * EventEmitterInterface.
@@ -17,45 +15,53 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait EmitterTrait
-{
+trait EmitterTrait {
+
+
     /**
      * Subscribe to an event.
+     *
+     * @return void
      */
-    public function on(string $eventName, callable $callBack, int $priority = 100)
-    {
+    function on(string $eventName, callable $callBack, int $priority = 100) {
+
         if (!isset($this->listeners[$eventName])) {
             $this->listeners[$eventName] = [
                 true,  // If there's only one item, it's sorted
                 [$priority],
-                [$callBack],
+                [$callBack]
             ];
         } else {
             $this->listeners[$eventName][0] = false; // marked as unsorted
             $this->listeners[$eventName][1][] = $priority;
             $this->listeners[$eventName][2][] = $callBack;
         }
+
     }
 
     /**
      * Subscribe to an event exactly once.
+     *
+     * @return void
      */
-    public function once(string $eventName, callable $callBack, int $priority = 100)
-    {
+    function once(string $eventName, callable $callBack, int $priority = 100) {
+
         $wrapper = null;
-        $wrapper = function () use ($eventName, $callBack, &$wrapper) {
-            $this->removeListener($eventName, $wrapper);
+        $wrapper = function() use ($eventName, $callBack, &$wrapper) {
 
+            $this->removeListener($eventName, $wrapper);
             return \call_user_func_array($callBack, \func_get_args());
+
         };
 
         $this->on($eventName, $wrapper, $priority);
+
     }
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were successfully
+     * This method will return true if 0 or more listeners were succesfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -73,35 +79,41 @@ trait EmitterTrait
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool
-    {
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
+
         if (\is_null($continueCallBack)) {
+
             foreach ($this->listeners($eventName) as $listener) {
+
                 $result = \call_user_func_array($listener, $arguments);
-                if (false === $result) {
+                if ($result === false) {
                     return false;
                 }
             }
+
         } else {
+
             $listeners = $this->listeners($eventName);
             $counter = \count($listeners);
 
             foreach ($listeners as $listener) {
-                --$counter;
+
+                $counter--;
                 $result = \call_user_func_array($listener, $arguments);
-                if (false === $result) {
+                if ($result === false) {
                     return false;
                 }
 
                 if ($counter > 0) {
-                    if (!$continueCallBack()) {
-                        break;
-                    }
+                    if (!$continueCallBack()) break;
                 }
+
             }
+
         }
 
         return true;
+
     }
 
     /**
@@ -112,14 +124,15 @@ trait EmitterTrait
      *
      * @return callable[]
      */
-    public function listeners(string $eventName): array
-    {
+    function listeners(string $eventName) : array {
+
         if (!isset($this->listeners[$eventName])) {
             return [];
         }
 
         // The list is not sorted
         if (!$this->listeners[$eventName][0]) {
+
             // Sorting
             \array_multisort($this->listeners[$eventName][1], SORT_NUMERIC, $this->listeners[$eventName][2]);
 
@@ -128,6 +141,7 @@ trait EmitterTrait
         }
 
         return $this->listeners[$eventName][2];
+
     }
 
     /**
@@ -136,8 +150,8 @@ trait EmitterTrait
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    public function removeListener(string $eventName, callable $listener): bool
-    {
+    function removeListener(string $eventName, callable $listener) : bool {
+
         if (!isset($this->listeners[$eventName])) {
             return false;
         }
@@ -145,12 +159,11 @@ trait EmitterTrait
             if ($check === $listener) {
                 unset($this->listeners[$eventName][1][$index]);
                 unset($this->listeners[$eventName][2][$index]);
-
                 return true;
             }
         }
-
         return false;
+
     }
 
     /**
@@ -159,20 +172,24 @@ trait EmitterTrait
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
+     *
+     * @return void
      */
-    public function removeAllListeners(string $eventName = null)
-    {
+    function removeAllListeners(string $eventName = null) {
+
         if (!\is_null($eventName)) {
             unset($this->listeners[$eventName]);
         } else {
             $this->listeners = [];
         }
+
     }
 
     /**
-     * The list of listeners.
+     * The list of listeners
      *
      * @var array
      */
     protected $listeners = [];
+
 }
diff --git a/vendor/sabre/event/lib/EventEmitter.php b/vendor/sabre/event/lib/EventEmitter.php
index 18971e3ee..cae6ac2a6 100644
--- a/vendor/sabre/event/lib/EventEmitter.php
+++ b/vendor/sabre/event/lib/EventEmitter.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -14,7 +12,8 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class EventEmitter implements EmitterInterface
-{
+class EventEmitter implements EmitterInterface {
+
     use EmitterTrait;
+
 }
diff --git a/vendor/sabre/event/lib/Loop/Loop.php b/vendor/sabre/event/lib/Loop/Loop.php
index ec09be921..301fe8920 100644
--- a/vendor/sabre/event/lib/Loop/Loop.php
+++ b/vendor/sabre/event/lib/Loop/Loop.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Loop;
 
@@ -17,19 +15,20 @@ namespace Sabre\Event\Loop;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Loop
-{
+class Loop {
+
     /**
      * Executes a function after x seconds.
+     *
+     * @return void
      */
-    public function setTimeout(callable $cb, float $timeout)
-    {
+    function setTimeout(callable $cb, float $timeout) {
+
         $triggerTime = microtime(true) + ($timeout);
 
         if (!$this->timers) {
             // Special case when the timers array was empty.
             $this->timers[] = [$triggerTime, $cb];
-
             return;
         }
 
@@ -47,12 +46,14 @@ class Loop
                     [[$triggerTime, $cb]]
                 );
                 break;
-            } elseif (0 === $index) {
+            } elseif ($index === 0) {
                 array_unshift($this->timers, [$triggerTime, $cb]);
                 break;
             }
-            --$index;
+            $index--;
+
         }
+
     }
 
     /**
@@ -61,12 +62,12 @@ class Loop
      * The value this function returns can be used to stop the interval with
      * clearInterval.
      */
-    public function setInterval(callable $cb, float $timeout): array
-    {
+    function setInterval(callable $cb, float $timeout) : array {
+
         $keepGoing = true;
         $f = null;
 
-        $f = function () use ($cb, &$f, $timeout, &$keepGoing) {
+        $f = function() use ($cb, &$f, $timeout, &$keepGoing) {
             if ($keepGoing) {
                 $cb();
                 $this->setTimeout($f, $timeout);
@@ -81,24 +82,32 @@ class Loop
         // Because I'm worried people will be confused by using a boolean as a
         // sort of identifier, I added an extra string.
         return ['I\'m an implementation detail', &$keepGoing];
+
     }
 
     /**
      * Stops a running interval.
+     *
+     * @return void
      */
-    public function clearInterval(array $intervalId)
-    {
+    function clearInterval(array $intervalId) {
+
         $intervalId[1] = false;
+
     }
 
     /**
      * Runs a function immediately at the next iteration of the loop.
+     *
+     * @return void
      */
-    public function nextTick(callable $cb)
-    {
+    function nextTick(callable $cb) {
+
         $this->nextTick[] = $cb;
+
     }
 
+
     /**
      * Adds a read stream.
      *
@@ -109,11 +118,13 @@ class Loop
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
+     * @return void
      */
-    public function addReadStream($stream, callable $cb)
-    {
-        $this->readStreams[(int) $stream] = $stream;
-        $this->readCallbacks[(int) $stream] = $cb;
+    function addReadStream($stream, callable $cb) {
+
+        $this->readStreams[(int)$stream] = $stream;
+        $this->readCallbacks[(int)$stream] = $cb;
+
     }
 
     /**
@@ -126,53 +137,65 @@ class Loop
      * prevent the eventloop from never stopping.
      *
      * @param resource $stream
+     * @return void
      */
-    public function addWriteStream($stream, callable $cb)
-    {
-        $this->writeStreams[(int) $stream] = $stream;
-        $this->writeCallbacks[(int) $stream] = $cb;
+    function addWriteStream($stream, callable $cb) {
+
+        $this->writeStreams[(int)$stream] = $stream;
+        $this->writeCallbacks[(int)$stream] = $cb;
+
     }
 
     /**
      * Stop watching a stream for reads.
      *
      * @param resource $stream
+     * @return void
      */
-    public function removeReadStream($stream)
-    {
+    function removeReadStream($stream) {
+
         unset(
-            $this->readStreams[(int) $stream],
-            $this->readCallbacks[(int) $stream]
+            $this->readStreams[(int)$stream],
+            $this->readCallbacks[(int)$stream]
         );
+
     }
 
     /**
      * Stop watching a stream for writes.
      *
      * @param resource $stream
+     * @return void
      */
-    public function removeWriteStream($stream)
-    {
+    function removeWriteStream($stream) {
+
         unset(
-            $this->writeStreams[(int) $stream],
-            $this->writeCallbacks[(int) $stream]
+            $this->writeStreams[(int)$stream],
+            $this->writeCallbacks[(int)$stream]
         );
+
     }
 
+
     /**
      * Runs the loop.
      *
-     * This function will run continuously, until there's no more events to
+     * This function will run continiously, until there's no more events to
      * handle.
+     *
+     * @return void
      */
-    public function run()
-    {
+    function run() {
+
         $this->running = true;
 
         do {
+
             $hasEvents = $this->tick(true);
+
         } while ($this->running && $hasEvents);
         $this->running = false;
+
     }
 
     /**
@@ -187,8 +210,8 @@ class Loop
      * This function will return true if there are _any_ events left in the
      * loop after the tick.
      */
-    public function tick(bool $block = false): bool
-    {
+    function tick(bool $block = false) : bool {
+
         $this->runNextTicks();
         $nextTimeout = $this->runTimers();
 
@@ -209,15 +232,19 @@ class Loop
 
         $this->runStreams($streamWait);
 
-        return $this->readStreams || $this->writeStreams || $this->nextTick || $this->timers;
+        return ($this->readStreams || $this->writeStreams || $this->nextTick || $this->timers);
+
     }
 
     /**
-     * Stops a running eventloop.
+     * Stops a running eventloop
+     *
+     * @return void
      */
-    public function stop()
-    {
+    function stop() {
+
         $this->running = false;
+
     }
 
     /**
@@ -225,14 +252,15 @@ class Loop
      *
      * return void
      */
-    protected function runNextTicks()
-    {
+    protected function runNextTicks() {
+
         $nextTick = $this->nextTick;
         $this->nextTick = [];
 
         foreach ($nextTick as $cb) {
             $cb();
         }
+
     }
 
     /**
@@ -245,8 +273,8 @@ class Loop
      *
      * @return float|null
      */
-    protected function runTimers()
-    {
+    protected function runTimers() {
+
         $now = microtime(true);
         while (($timer = array_pop($this->timers)) && $timer[0] < $now) {
             $timer[1]();
@@ -254,9 +282,9 @@ class Loop
         // Add the last timer back to the array.
         if ($timer) {
             $this->timers[] = $timer;
-
             return max(0, $timer[0] - microtime(true));
         }
+
     }
 
     /**
@@ -267,31 +295,36 @@ class Loop
      *
      * @param float|null timeout
      */
-    protected function runStreams($timeout)
-    {
+    protected function runStreams($timeout) {
+
         if ($this->readStreams || $this->writeStreams) {
+
             $read = $this->readStreams;
             $write = $this->writeStreams;
             $except = null;
-            if (stream_select($read, $write, $except, (null === $timeout) ? null : 0, $timeout ? (int) ($timeout * 1000000) : 0)) {
+            if (stream_select($read, $write, $except, ($timeout === null) ? null : 0, $timeout ? (int)($timeout * 1000000) : 0)) {
+
                 // See PHP Bug https://bugs.php.net/bug.php?id=62452
                 // Fixed in PHP7
                 foreach ($read as $readStream) {
-                    $readCb = $this->readCallbacks[(int) $readStream];
+                    $readCb = $this->readCallbacks[(int)$readStream];
                     $readCb();
                 }
                 foreach ($write as $writeStream) {
-                    $writeCb = $this->writeCallbacks[(int) $writeStream];
+                    $writeCb = $this->writeCallbacks[(int)$writeStream];
                     $writeCb();
                 }
+
             }
+
         } elseif ($this->running && ($this->nextTick || $this->timers)) {
-            usleep(null !== $timeout ? intval($timeout * 1000000) : 200000);
+            usleep($timeout !== null ? intval($timeout * 1000000) : 200000);
         }
+
     }
 
     /**
-     * Is the main loop active.
+     * Is the main loop active
      *
      * @var bool
      */
@@ -328,14 +361,16 @@ class Loop
     /**
      * List of read callbacks, indexed by stream id.
      *
-     * @var callable[]
+     * @var callback[]
      */
     protected $readCallbacks = [];
 
     /**
      * List of write callbacks, indexed by stream id.
      *
-     * @var callable[]
+     * @var callback[]
      */
     protected $writeCallbacks = [];
+
+
 }
diff --git a/vendor/sabre/event/lib/Loop/functions.php b/vendor/sabre/event/lib/Loop/functions.php
index bf4d933f2..b5884b2b6 100644
--- a/vendor/sabre/event/lib/Loop/functions.php
+++ b/vendor/sabre/event/lib/Loop/functions.php
@@ -1,15 +1,16 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Loop;
 
 /**
  * Executes a function after x seconds.
+ *
+ * @return void
  */
-function setTimeout(callable $cb, float $timeout)
-{
+function setTimeout(callable $cb, float $timeout) {
+
     instance()->setTimeout($cb, $timeout);
+
 }
 
 /**
@@ -18,27 +19,35 @@ function setTimeout(callable $cb, float $timeout)
  * The value this function returns can be used to stop the interval with
  * clearInterval.
  */
-function setInterval(callable $cb, float $timeout): array
-{
+function setInterval(callable $cb, float $timeout) : array {
+
     return instance()->setInterval($cb, $timeout);
+
 }
 
 /**
  * Stops a running interval.
+ *
+ * @return void
  */
-function clearInterval(array $intervalId)
-{
+function clearInterval(array $intervalId) {
+
     instance()->clearInterval($intervalId);
+
 }
 
 /**
  * Runs a function immediately at the next iteration of the loop.
+ *
+ * @return void
  */
-function nextTick(callable $cb)
-{
+function nextTick(callable $cb) {
+
     instance()->nextTick($cb);
+
 }
 
+
 /**
  * Adds a read stream.
  *
@@ -49,10 +58,12 @@ function nextTick(callable $cb)
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
+ * @return void
  */
-function addReadStream($stream, callable $cb)
-{
+function addReadStream($stream, callable $cb) {
+
     instance()->addReadStream($stream, $cb);
+
 }
 
 /**
@@ -65,41 +76,51 @@ function addReadStream($stream, callable $cb)
  * prevent the eventloop from never stopping.
  *
  * @param resource $stream
+ * @return void
  */
-function addWriteStream($stream, callable $cb)
-{
+function addWriteStream($stream, callable $cb) {
+
     instance()->addWriteStream($stream, $cb);
+
 }
 
 /**
  * Stop watching a stream for reads.
  *
  * @param resource $stream
+ * @return void
  */
-function removeReadStream($stream)
-{
+function removeReadStream($stream) {
+
     instance()->removeReadStream($stream);
+
 }
 
 /**
  * Stop watching a stream for writes.
  *
  * @param resource $stream
+ * @return void
  */
-function removeWriteStream($stream)
-{
+function removeWriteStream($stream) {
+
     instance()->removeWriteStream($stream);
+
 }
 
+
 /**
  * Runs the loop.
  *
- * This function will run continuously, until there's no more events to
+ * This function will run continiously, until there's no more events to
  * handle.
+ *
+ * @return void
  */
-function run()
-{
+function run() {
+
     instance()->run();
+
 }
 
 /**
@@ -114,30 +135,34 @@ function run()
  * This function will return true if there are _any_ events left in the
  * loop after the tick.
  */
-function tick(bool $block = false): bool
-{
+function tick(bool $block = false) : bool {
+
     return instance()->tick($block);
+
 }
 
 /**
- * Stops a running eventloop.
+ * Stops a running eventloop
+ *
+ * @return void
  */
-function stop()
-{
+function stop() {
+
     instance()->stop();
+
 }
 
 /**
  * Retrieves or sets the global Loop object.
  */
-function instance(Loop $newLoop = null): Loop
-{
+function instance(Loop $newLoop = null) : Loop {
+
     static $loop;
     if ($newLoop) {
         $loop = $newLoop;
     } elseif (!$loop) {
         $loop = new Loop();
     }
-
     return $loop;
+
 }
diff --git a/vendor/sabre/event/lib/Promise.php b/vendor/sabre/event/lib/Promise.php
index 1d4ddd74a..1d04bd4d4 100644
--- a/vendor/sabre/event/lib/Promise.php
+++ b/vendor/sabre/event/lib/Promise.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -23,8 +21,8 @@ use Throwable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Promise
-{
+class Promise {
+
     /**
      * The asynchronous operation is pending.
      */
@@ -56,14 +54,15 @@ class Promise
      * Each are callbacks that map to $this->fulfill and $this->reject.
      * Using the executor is optional.
      */
-    public function __construct(callable $executor = null)
-    {
+    function __construct(callable $executor = null) {
+
         if ($executor) {
             $executor(
                 [$this, 'fulfill'],
                 [$this, 'reject']
             );
         }
+
     }
 
     /**
@@ -85,32 +84,32 @@ class Promise
      * If either of the callbacks throw an exception, the returned promise will
      * be rejected and the exception will be passed back.
      */
-    public function then(callable $onFulfilled = null, callable $onRejected = null): Promise
-    {
+    function then(callable $onFulfilled = null, callable $onRejected = null) : Promise {
+
         // This new subPromise will be returned from this function, and will
         // be fulfilled with the result of the onFulfilled or onRejected event
         // handlers.
         $subPromise = new self();
 
         switch ($this->state) {
-            case self::PENDING:
+            case self::PENDING :
                 // The operation is pending, so we keep a reference to the
                 // event handlers so we can call them later.
                 $this->subscribers[] = [$subPromise, $onFulfilled, $onRejected];
                 break;
-            case self::FULFILLED:
+            case self::FULFILLED :
                 // The async operation is already fulfilled, so we trigger the
                 // onFulfilled callback asap.
                 $this->invokeCallback($subPromise, $onFulfilled);
                 break;
-            case self::REJECTED:
-                // The async operation failed, so we call the onRejected
+            case self::REJECTED :
+                // The async operation failed, so we call teh onRejected
                 // callback asap.
                 $this->invokeCallback($subPromise, $onRejected);
                 break;
         }
-
         return $subPromise;
+
     }
 
     /**
@@ -119,19 +118,20 @@ class Promise
      * Its usage is identical to then(). However, the otherwise() function is
      * preferred.
      */
-    public function otherwise(callable $onRejected): Promise
-    {
+    function otherwise(callable $onRejected) : Promise {
+
         return $this->then(null, $onRejected);
+
     }
 
     /**
      * Marks this promise as fulfilled and sets its return value.
      *
      * @param mixed $value
+     * @return void
      */
-    public function fulfill($value = null)
-    {
-        if (self::PENDING !== $this->state) {
+    function fulfill($value = null) {
+        if ($this->state !== self::PENDING) {
             throw new PromiseAlreadyResolvedException('This promise is already resolved, and you\'re not allowed to resolve a promise more than once');
         }
         $this->state = self::FULFILLED;
@@ -143,10 +143,11 @@ class Promise
 
     /**
      * Marks this promise as rejected, and set it's rejection reason.
+     *
+     * @return void
      */
-    public function reject(Throwable $reason)
-    {
-        if (self::PENDING !== $this->state) {
+    function reject(Throwable $reason) {
+        if ($this->state !== self::PENDING) {
             throw new PromiseAlreadyResolvedException('This promise is already resolved, and you\'re not allowed to resolve a promise more than once');
         }
         $this->state = self::REJECTED;
@@ -154,12 +155,13 @@ class Promise
         foreach ($this->subscribers as $subscriber) {
             $this->invokeCallback($subscriber[0], $subscriber[2]);
         }
+
     }
 
     /**
      * Stops execution until this promise is resolved.
      *
-     * This method stops execution completely. If the promise is successful with
+     * This method stops exection completely. If the promise is successful with
      * a value, this method will return this value. If the promise was
      * rejected, this method will throw an exception.
      *
@@ -169,10 +171,11 @@ class Promise
      *
      * @return mixed
      */
-    public function wait()
-    {
+    function wait() {
+
         $hasEvents = true;
-        while (self::PENDING === $this->state) {
+        while ($this->state === self::PENDING) {
+
             if (!$hasEvents) {
                 throw new \LogicException('There were no more events in the loop. This promise will never be fulfilled.');
             }
@@ -180,9 +183,10 @@ class Promise
             // As long as the promise is not fulfilled, we tell the event loop
             // to handle events, and to block.
             $hasEvents = Loop\tick(true);
+
         }
 
-        if (self::FULFILLED === $this->state) {
+        if ($this->state === self::FULFILLED) {
             // If the state of this promise is fulfilled, we can return the value.
             return $this->value;
         } else {
@@ -190,8 +194,11 @@ class Promise
             // errored. Therefore we need to throw an exception.
             throw $this->value;
         }
+
+
     }
 
+
     /**
      * A list of subscribers. Subscribers are the callbacks that want us to let
      * them know if the callback was fulfilled or rejected.
@@ -217,18 +224,21 @@ class Promise
      * correctly, and any chained promises are also correctly fulfilled or
      * rejected.
      *
+     * @param Promise $subPromise
      * @param callable $callBack
+     * @return void
      */
-    private function invokeCallback(Promise $subPromise, callable $callBack = null)
-    {
+    private function invokeCallback(Promise $subPromise, callable $callBack = null) {
+
         // We use 'nextTick' to ensure that the event handlers are always
         // triggered outside of the calling stack in which they were originally
         // passed to 'then'.
         //
         // This makes the order of execution more predictable.
-        Loop\nextTick(function () use ($callBack, $subPromise) {
+        Loop\nextTick(function() use ($callBack, $subPromise) {
             if (is_callable($callBack)) {
                 try {
+
                     $result = $callBack($this->value);
                     if ($result instanceof self) {
                         // If the callback (onRejected or onFulfilled)
@@ -247,7 +257,7 @@ class Promise
                     $subPromise->reject($e);
                 }
             } else {
-                if (self::FULFILLED === $this->state) {
+                if ($this->state === self::FULFILLED) {
                     $subPromise->fulfill($this->value);
                 } else {
                     $subPromise->reject($this->value);
@@ -255,4 +265,5 @@ class Promise
             }
         });
     }
+
 }
diff --git a/vendor/sabre/event/lib/Promise/functions.php b/vendor/sabre/event/lib/Promise/functions.php
index 986fe2b00..275492cbc 100644
--- a/vendor/sabre/event/lib/Promise/functions.php
+++ b/vendor/sabre/event/lib/Promise/functions.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event\Promise;
 
@@ -16,6 +14,7 @@ use Throwable;
  * @license http://sabre.io/license/ Modified BSD License
  */
 
+
 /**
  * This function takes an array of Promises, and returns a Promise that
  * resolves when all of the given arguments have resolved.
@@ -25,17 +24,17 @@ use Throwable;
  *
  * This array will be in the exact same order as the array of input promises.
  *
- * If any of the given Promises fails, the returned promise will immediately
+ * If any of the given Promises fails, the returned promise will immidiately
  * fail with the first Promise that fails, and its reason.
  *
  * @param Promise[] $promises
  */
-function all(array $promises): Promise
-{
-    return new Promise(function ($success, $fail) use ($promises) {
+function all(array $promises) : Promise {
+
+    return new Promise(function($success, $fail) use ($promises) {
+
         if (empty($promises)) {
             $success([]);
-
             return;
         }
 
@@ -43,23 +42,25 @@ function all(array $promises): Promise
         $completeResult = [];
 
         foreach ($promises as $promiseIndex => $subPromise) {
+
             $subPromise->then(
-                function ($result) use ($promiseIndex, &$completeResult, &$successCount, $success, $promises) {
+                function($result) use ($promiseIndex, &$completeResult, &$successCount, $success, $promises) {
                     $completeResult[$promiseIndex] = $result;
-                    ++$successCount;
+                    $successCount++;
                     if ($successCount === count($promises)) {
                         $success($completeResult);
                     }
-
                     return $result;
                 }
             )->otherwise(
-                function ($reason) use ($fail) {
+                function($reason) use ($fail) {
                     $fail($reason);
                 }
             );
+
         }
     });
+
 }
 
 /**
@@ -71,20 +72,22 @@ function all(array $promises): Promise
  *
  * @param Promise[] $promises
  */
-function race(array $promises): Promise
-{
-    return new Promise(function ($success, $fail) use ($promises) {
+function race(array $promises) : Promise {
+
+    return new Promise(function($success, $fail) use ($promises) {
+
         $alreadyDone = false;
         foreach ($promises as $promise) {
+
             $promise->then(
-                function ($result) use ($success, &$alreadyDone) {
+                function($result) use ($success, &$alreadyDone) {
                     if ($alreadyDone) {
                         return;
                     }
                     $alreadyDone = true;
                     $success($result);
                 },
-                function ($reason) use ($fail, &$alreadyDone) {
+                function($reason) use ($fail, &$alreadyDone) {
                     if ($alreadyDone) {
                         return;
                     }
@@ -92,10 +95,14 @@ function race(array $promises): Promise
                     $fail($reason);
                 }
             );
+
         }
+
     });
+
 }
 
+
 /**
  * Returns a Promise that resolves with the given value.
  *
@@ -104,25 +111,25 @@ function race(array $promises): Promise
  *
  * @param mixed $value
  */
-function resolve($value): Promise
-{
+function resolve($value) : Promise {
+
     if ($value instanceof Promise) {
         return $value->then();
     } else {
         $promise = new Promise();
         $promise->fulfill($value);
-
         return $promise;
     }
+
 }
 
 /**
  * Returns a Promise that will reject with the given reason.
  */
-function reject(Throwable $reason): Promise
-{
+function reject(Throwable $reason) : Promise {
+
     $promise = new Promise();
     $promise->reject($reason);
-
     return $promise;
+
 }
diff --git a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
index abb6c108e..534a3d494 100644
--- a/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
+++ b/vendor/sabre/event/lib/PromiseAlreadyResolvedException.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -12,6 +10,6 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PromiseAlreadyResolvedException extends \LogicException
-{
+class PromiseAlreadyResolvedException extends \LogicException {
+
 }
diff --git a/vendor/sabre/event/lib/Version.php b/vendor/sabre/event/lib/Version.php
index e98e2e3ff..9aee4b3ab 100644
--- a/vendor/sabre/event/lib/Version.php
+++ b/vendor/sabre/event/lib/Version.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -11,10 +9,11 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Version
-{
+class Version {
+
     /**
-     * Full version number.
+     * Full version number
      */
-    const VERSION = '5.1.0';
+    const VERSION = '5.0.3';
+
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitter.php b/vendor/sabre/event/lib/WildcardEmitter.php
index 1b7c248b2..2ef15fe83 100644
--- a/vendor/sabre/event/lib/WildcardEmitter.php
+++ b/vendor/sabre/event/lib/WildcardEmitter.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -16,7 +14,7 @@ namespace Sabre\Event;
  *   on('change:*')
  *
  * A few notes:
- *
+ * 
  * - Wildcards only work at the end of an event name.
  * - Currently you can only use 1 wildcard.
  * - Using ":" as a separator is optional, but it's highly recommended to use
@@ -30,7 +28,10 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class WildcardEmitter implements EmitterInterface
-{
+class WildcardEmitter implements EmitterInterface {
+
     use WildcardEmitterTrait;
+
+
+
 }
diff --git a/vendor/sabre/event/lib/WildcardEmitterTrait.php b/vendor/sabre/event/lib/WildcardEmitterTrait.php
index 206a8f3c5..7d8d62c26 100644
--- a/vendor/sabre/event/lib/WildcardEmitterTrait.php
+++ b/vendor/sabre/event/lib/WildcardEmitterTrait.php
@@ -1,11 +1,9 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
 /**
- * Wildcard Emitter Trait.
+ * Wildcard Emitter Trait
  *
  * This trait provides the implementation for WildCardEmitter
  * Refer to that class for the full documentation about this
@@ -19,19 +17,21 @@ namespace Sabre\Event;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait WildcardEmitterTrait
-{
+trait WildcardEmitterTrait {
+
     /**
      * Subscribe to an event.
+     *
+     * @return void
      */
-    public function on(string $eventName, callable $callBack, int $priority = 100)
-    {
-        // If it ends with a wildcard, we use the wildcardListeners array
-        if ('*' === $eventName[\strlen($eventName) - 1]) {
+    function on(string $eventName, callable $callBack, int $priority = 100) {
+
+        // If it ends with a wildcard, we use the wildcardListeners array 
+        if ($eventName[\strlen($eventName) - 1] === '*') {
             $eventName = \substr($eventName, 0, -1);
-            $listeners = &$this->wildcardListeners;
+            $listeners = & $this->wildcardListeners;
         } else {
-            $listeners = &$this->listeners;
+            $listeners = & $this->listeners;
         }
 
         // Always fully reset the listener index. This is fairly sane for most
@@ -44,27 +44,32 @@ trait WildcardEmitterTrait
             $listeners[$eventName] = [];
         }
         $listeners[$eventName][] = [$priority, $callBack];
+
     }
 
     /**
      * Subscribe to an event exactly once.
+     *
+     * @return void
      */
-    public function once(string $eventName, callable $callBack, int $priority = 100)
-    {
+    function once(string $eventName, callable $callBack, int $priority = 100) {
+
         $wrapper = null;
-        $wrapper = function () use ($eventName, $callBack, &$wrapper) {
-            $this->removeListener($eventName, $wrapper);
+        $wrapper = function() use ($eventName, $callBack, &$wrapper) {
 
+            $this->removeListener($eventName, $wrapper);
             return \call_user_func_array($callBack, \func_get_args());
+
         };
 
         $this->on($eventName, $wrapper, $priority);
+
     }
 
     /**
      * Emits an event.
      *
-     * This method will return true if 0 or more listeners were successfully
+     * This method will return true if 0 or more listeners were succesfully
      * handled. false is returned if one of the events broke the event chain.
      *
      * If the continueCallBack is specified, this callback will be called every
@@ -82,35 +87,42 @@ trait WildcardEmitterTrait
      * Lastly, if there are 5 event handlers for an event. The continueCallback
      * will be called at most 4 times.
      */
-    public function emit(string $eventName, array $arguments = [], callable $continueCallBack = null): bool
-    {
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool {
+
         if (\is_null($continueCallBack)) {
+
             foreach ($this->listeners($eventName) as $listener) {
+
                 $result = \call_user_func_array($listener, $arguments);
-                if (false === $result) {
+                if ($result === false) {
                     return false;
                 }
             }
+
         } else {
+
             $listeners = $this->listeners($eventName);
             $counter = \count($listeners);
 
             foreach ($listeners as $listener) {
-                --$counter;
+
+                $counter--;
                 $result = \call_user_func_array($listener, $arguments);
-                if (false === $result) {
+                if ($result === false) {
                     return false;
                 }
 
                 if ($counter > 0) {
-                    if (!$continueCallBack()) {
-                        break;
-                    }
+                    if (!$continueCallBack()) break;
                 }
+
             }
+
         }
 
         return true;
+
+
     }
 
     /**
@@ -121,27 +133,34 @@ trait WildcardEmitterTrait
      *
      * @return callable[]
      */
-    public function listeners(string $eventName): array
-    {
+    function listeners(string $eventName) : array {
+
         if (!\array_key_exists($eventName, $this->listenerIndex)) {
+
             // Create a new index.
             $listeners = [];
             $listenersPriority = [];
-            if (isset($this->listeners[$eventName])) {
-                foreach ($this->listeners[$eventName] as $listener) {
-                    $listenersPriority[] = $listener[0];
-                    $listeners[] = $listener[1];
-                }
+            if (isset($this->listeners[$eventName])) foreach ($this->listeners[$eventName] as $listener) {
+
+                $listenersPriority[] = $listener[0];
+                $listeners[] = $listener[1];
+
             }
 
             foreach ($this->wildcardListeners as $wcEvent => $wcListeners) {
+
                 // Wildcard match
                 if (\substr($eventName, 0, \strlen($wcEvent)) === $wcEvent) {
+
                     foreach ($wcListeners as $listener) {
+
                         $listenersPriority[] = $listener[0];
                         $listeners[] = $listener[1];
+
                     }
+
                 }
+
             }
 
             // Sorting by priority
@@ -149,9 +168,11 @@ trait WildcardEmitterTrait
 
             // Creating index
             $this->listenerIndex[$eventName] = $listeners;
+
         }
 
         return $this->listenerIndex[$eventName];
+
     }
 
     /**
@@ -160,14 +181,14 @@ trait WildcardEmitterTrait
      * If the listener could not be found, this method will return false. If it
      * was removed it will return true.
      */
-    public function removeListener(string $eventName, callable $listener): bool
-    {
-        // If it ends with a wildcard, we use the wildcardListeners array
-        if ('*' === $eventName[\strlen($eventName) - 1]) {
+    function removeListener(string $eventName, callable $listener) : bool {
+
+        // If it ends with a wildcard, we use the wildcardListeners array 
+        if ($eventName[\strlen($eventName) - 1] === '*') {
             $eventName = \substr($eventName, 0, -1);
-            $listeners = &$this->wildcardListeners;
+            $listeners = & $this->wildcardListeners;
         } else {
-            $listeners = &$this->listeners;
+            $listeners = & $this->listeners;
         }
 
         if (!isset($listeners[$eventName])) {
@@ -175,17 +196,21 @@ trait WildcardEmitterTrait
         }
 
         foreach ($listeners[$eventName] as $index => $check) {
+
             if ($check[1] === $listener) {
+
                 // Remove listener
                 unset($listeners[$eventName][$index]);
                 // Reset index
                 $this->listenerIndex = [];
-
                 return true;
+
             }
+
         }
 
         return false;
+
     }
 
     /**
@@ -194,32 +219,38 @@ trait WildcardEmitterTrait
      * If the eventName argument is specified, all listeners for that event are
      * removed. If it is not specified, every listener for every event is
      * removed.
+     *
+     * @return void
      */
-    public function removeAllListeners(string $eventName = null)
-    {
+    function removeAllListeners(string $eventName = null) {
+
         if (\is_null($eventName)) {
             $this->listeners = [];
             $this->wildcardListeners = [];
+
         } else {
-            if ('*' === $eventName[\strlen($eventName) - 1]) {
+
+            if ($eventName[\strlen($eventName) - 1] === '*') {
                 // Wildcard event
                 unset($this->wildcardListeners[\substr($eventName, 0, -1)]);
             } else {
                 unset($this->listeners[$eventName]);
             }
+
         }
 
         // Reset index
         $this->listenerIndex = [];
+
     }
 
     /**
-     * The list of listeners.
+     * The list of listeners
      */
     protected $listeners = [];
 
     /**
-     * The list of "wildcard listeners".
+     * The list of "wildcard listeners". 
      */
     protected $wildcardListeners = [];
 
diff --git a/vendor/sabre/event/lib/coroutine.php b/vendor/sabre/event/lib/coroutine.php
index a6a2baf41..750e8ab52 100644
--- a/vendor/sabre/event/lib/coroutine.php
+++ b/vendor/sabre/event/lib/coroutine.php
@@ -1,6 +1,4 @@
-<?php
-
-declare(strict_types=1);
+<?php declare (strict_types=1);
 
 namespace Sabre\Event;
 
@@ -43,13 +41,12 @@ use Throwable;
  * });
  *
  * @return \Sabre\Event\Promise
- *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-function coroutine(callable $gen): Promise
-{
+function coroutine(callable $gen) : Promise {
+
     $generator = $gen();
     if (!$generator instanceof Generator) {
         throw new \InvalidArgumentException('You must pass a generator function');
@@ -62,20 +59,22 @@ function coroutine(callable $gen): Promise
      * So tempted to use the mythical y-combinator here, but it's not needed in
      * PHP.
      */
-    $advanceGenerator = function () use (&$advanceGenerator, $generator, $promise) {
+    $advanceGenerator = function() use (&$advanceGenerator, $generator, $promise, &$lastYieldResult) {
+
         while ($generator->valid()) {
+
             $yieldedValue = $generator->current();
             if ($yieldedValue instanceof Promise) {
                 $yieldedValue->then(
-                    function ($value) use ($generator, &$advanceGenerator) {
+                    function($value) use ($generator, &$advanceGenerator, &$lastYieldResult) {
                         $generator->send($value);
                         $advanceGenerator();
                     },
-                    function (Throwable $reason) use ($generator, $advanceGenerator) {
+                    function(Throwable $reason) use ($generator, $advanceGenerator) {
                         $generator->throw($reason);
                         $advanceGenerator();
                     }
-                )->otherwise(function (Throwable $reason) use ($promise) {
+                )->otherwise(function(Throwable $reason) use ($promise) {
                     // This error handler would be called, if something in the
                     // generator throws an exception, and it's not caught
                     // locally.
@@ -88,25 +87,31 @@ function coroutine(callable $gen): Promise
                 // If the value was not a promise, we'll just let it pass through.
                 $generator->send($yieldedValue);
             }
+
         }
 
         // If the generator is at the end, and we didn't run into an exception,
         // We're grabbing the "return" value and fulfilling our top-level
         // promise with its value.
-        if (!$generator->valid() && Promise::PENDING === $promise->state) {
-            $returnValue = $generator->getReturn();
-
-            // The return value is a promise.
-            if ($returnValue instanceof Promise) {
-                $returnValue->then(function ($value) use ($promise) {
-                    $promise->fulfill($value);
-                }, function (Throwable $reason) use ($promise) {
-                    $promise->reject($reason);
-                });
-            } else {
-                $promise->fulfill($returnValue);
-            }
+         if (!$generator->valid() && $promise->state === Promise::PENDING) {
+             $returnValue = $generator->getReturn();
+
+             // The return value is a promise.
+             if ($returnValue instanceof Promise) {
+                 $returnValue->then(function($value) use ($promise) {
+                     $promise->fulfill($value);
+                 }, function(Throwable $reason) {
+                     $promise->reject($reason);
+                 });
+             } else {
+
+                 $promise->fulfill($returnValue);
+
+             }
+
+
         }
+
     };
 
     try {
@@ -116,4 +121,5 @@ function coroutine(callable $gen): Promise
     }
 
     return $promise;
+
 }
diff --git a/vendor/sabre/event/phpunit.xml.dist b/vendor/sabre/event/phpunit.xml.dist
new file mode 100644
index 000000000..ccd59be9c
--- /dev/null
+++ b/vendor/sabre/event/phpunit.xml.dist
@@ -0,0 +1,18 @@
+<phpunit
+  colors="true"
+  bootstrap="vendor/autoload.php"
+  convertErrorsToExceptions="true"
+  convertNoticesToExceptions="true"
+  convertWarningsToExceptions="true"
+  strict="true"
+  >
+  <testsuite name="sabre-event">
+    <directory>tests/</directory>
+  </testsuite>
+
+  <filter>
+    <whitelist addUncoveredFilesFromWhitelist="true">
+        <directory suffix=".php">./lib/</directory>
+   </whitelist>
+  </filter>
+</phpunit>