1 files changed, 83 insertions, 0 deletions
diff --git a/vendor/sabre/event/lib/EmitterInterface.php b/vendor/sabre/event/lib/EmitterInterface.php
new file mode 100644
index 000000000..a7e4b6132
--- /dev/null
+++ b/vendor/sabre/event/lib/EmitterInterface.php
@@ -0,0 +1,83 @@
+<?php declare (strict_types=1);
+
+namespace Sabre\Event;
+
+/**
+ * Event Emitter Interface
+ *
+ * Anything that accepts listeners and emits events should implement this
+ * interface.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface EmitterInterface {
+
+    /**
+     * Subscribe to an event.
+     *
+     * @return void
+     */
+    function on(string $eventName, callable $callBack, int $priority = 100);
+
+    /**
+     * Subscribe to an event exactly once.
+     *
+     * @return void
+     */
+    function once(string $eventName, callable $callBack, int $priority = 100);
+
+    /**
+     * Emits an event.
+     *
+     * 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
+     * time before the next event handler is called.
+     *
+     * If the continueCallback returns false, event propagation stops. This
+     * allows you to use the eventEmitter as a means for listeners to implement
+     * functionality in your application, and break the event loop as soon as
+     * some condition is fulfilled.
+     *
+     * Note that returning false from an event subscriber breaks propagation
+     * and returns false, but if the continue-callback stops propagation, this
+     * is still considered a 'successful' operation and returns true.
+     *
+     * Lastly, if there are 5 event handlers for an event. The continueCallback
+     * will be called at most 4 times.
+     */
+    function emit(string $eventName, array $arguments = [], callable $continueCallBack = null) : bool;
+
+    /**
+     * Returns the list of listeners for an event.
+     *
+     * The list is returned as an array, and the list of events are sorted by
+     * their priority.
+     *
+     * @return callable[]
+     */
+    function listeners(string $eventName) : array;
+
+    /**
+     * Removes a specific listener from an event.
+     *
+     * If the listener could not be found, this method will return false. If it
+     * was removed it will return true.
+     */
+    function removeListener(string $eventName, callable $listener) : bool;
+
+    /**
+     * Removes all listeners.
+     *
+     * 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
+     */
+    function removeAllListeners(string $eventName = null);
+
+}