1 files changed, 330 insertions, 0 deletions
diff --git a/accessible/tests/mochitest/promisified-events.js b/accessible/tests/mochitest/promisified-events.js
new file mode 100644
index 0000000000..cabeeae10e
--- /dev/null
+++ b/accessible/tests/mochitest/promisified-events.js
@@ -0,0 +1,330 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// This is loaded by head.js, so has the same globals, hence we import the
+// globals from there.
+/* import-globals-from common.js */
+
+/* exported EVENT_ANNOUNCEMENT, EVENT_REORDER, EVENT_SCROLLING,
+            EVENT_SCROLLING_END, EVENT_SHOW, EVENT_TEXT_INSERTED,
+            EVENT_TEXT_REMOVED, EVENT_DOCUMENT_LOAD_COMPLETE, EVENT_HIDE,
+            EVENT_TEXT_ATTRIBUTE_CHANGED, EVENT_TEXT_CARET_MOVED, EVENT_SELECTION,
+            EVENT_DESCRIPTION_CHANGE, EVENT_NAME_CHANGE, EVENT_STATE_CHANGE,
+            EVENT_VALUE_CHANGE, EVENT_TEXT_VALUE_CHANGE, EVENT_FOCUS,
+            EVENT_DOCUMENT_RELOAD, EVENT_VIRTUALCURSOR_CHANGED, EVENT_ALERT,
+            EVENT_OBJECT_ATTRIBUTE_CHANGED, EVENT_TABLE_STYLING_CHANGED, UnexpectedEvents, waitForEvent,
+            waitForEvents, waitForOrderedEvents, waitForStateChange,
+            stateChangeEventArgs */
+
+const EVENT_ANNOUNCEMENT = nsIAccessibleEvent.EVENT_ANNOUNCEMENT;
+const EVENT_DOCUMENT_LOAD_COMPLETE =
+  nsIAccessibleEvent.EVENT_DOCUMENT_LOAD_COMPLETE;
+const EVENT_HIDE = nsIAccessibleEvent.EVENT_HIDE;
+const EVENT_REORDER = nsIAccessibleEvent.EVENT_REORDER;
+const EVENT_SCROLLING = nsIAccessibleEvent.EVENT_SCROLLING;
+const EVENT_SCROLLING_START = nsIAccessibleEvent.EVENT_SCROLLING_START;
+const EVENT_SCROLLING_END = nsIAccessibleEvent.EVENT_SCROLLING_END;
+const EVENT_SELECTION = nsIAccessibleEvent.EVENT_SELECTION;
+const EVENT_SELECTION_WITHIN = nsIAccessibleEvent.EVENT_SELECTION_WITHIN;
+const EVENT_SHOW = nsIAccessibleEvent.EVENT_SHOW;
+const EVENT_STATE_CHANGE = nsIAccessibleEvent.EVENT_STATE_CHANGE;
+const EVENT_TEXT_ATTRIBUTE_CHANGED =
+  nsIAccessibleEvent.EVENT_TEXT_ATTRIBUTE_CHANGED;
+const EVENT_TEXT_CARET_MOVED = nsIAccessibleEvent.EVENT_TEXT_CARET_MOVED;
+const EVENT_TEXT_INSERTED = nsIAccessibleEvent.EVENT_TEXT_INSERTED;
+const EVENT_TEXT_REMOVED = nsIAccessibleEvent.EVENT_TEXT_REMOVED;
+const EVENT_DESCRIPTION_CHANGE = nsIAccessibleEvent.EVENT_DESCRIPTION_CHANGE;
+const EVENT_NAME_CHANGE = nsIAccessibleEvent.EVENT_NAME_CHANGE;
+const EVENT_VALUE_CHANGE = nsIAccessibleEvent.EVENT_VALUE_CHANGE;
+const EVENT_TEXT_VALUE_CHANGE = nsIAccessibleEvent.EVENT_TEXT_VALUE_CHANGE;
+const EVENT_FOCUS = nsIAccessibleEvent.EVENT_FOCUS;
+const EVENT_DOCUMENT_RELOAD = nsIAccessibleEvent.EVENT_DOCUMENT_RELOAD;
+const EVENT_VIRTUALCURSOR_CHANGED =
+  nsIAccessibleEvent.EVENT_VIRTUALCURSOR_CHANGED;
+const EVENT_ALERT = nsIAccessibleEvent.EVENT_ALERT;
+const EVENT_TEXT_SELECTION_CHANGED =
+  nsIAccessibleEvent.EVENT_TEXT_SELECTION_CHANGED;
+const EVENT_LIVE_REGION_ADDED = nsIAccessibleEvent.EVENT_LIVE_REGION_ADDED;
+const EVENT_LIVE_REGION_REMOVED = nsIAccessibleEvent.EVENT_LIVE_REGION_REMOVED;
+const EVENT_OBJECT_ATTRIBUTE_CHANGED =
+  nsIAccessibleEvent.EVENT_OBJECT_ATTRIBUTE_CHANGED;
+const EVENT_TABLE_STYLING_CHANGED =
+  nsIAccessibleEvent.EVENT_TABLE_STYLING_CHANGED;
+const EVENT_INNER_REORDER = nsIAccessibleEvent.EVENT_INNER_REORDER;
+
+const EventsLogger = {
+  enabled: false,
+
+  log(msg) {
+    if (this.enabled) {
+      info(msg);
+    }
+  },
+};
+
+/**
+ * Describe an event in string format.
+ * @param  {nsIAccessibleEvent}  event  event to strigify
+ */
+function eventToString(event) {
+  let type = eventTypeToString(event.eventType);
+  let info = `Event type: ${type}`;
+
+  if (event instanceof nsIAccessibleStateChangeEvent) {
+    let stateStr = statesToString(
+      event.isExtraState ? 0 : event.state,
+      event.isExtraState ? event.state : 0
+    );
+    info += `, state: ${stateStr}, is enabled: ${event.isEnabled}`;
+  } else if (event instanceof nsIAccessibleTextChangeEvent) {
+    let tcType = event.isInserted ? "inserted" : "removed";
+    info += `, start: ${event.start}, length: ${event.length}, ${tcType} text: ${event.modifiedText}`;
+  }
+
+  info += `. Target: ${prettyName(event.accessible)}`;
+  return info;
+}
+
+function matchEvent(event, matchCriteria) {
+  if (!matchCriteria) {
+    return true;
+  }
+
+  let acc = event.accessible;
+  switch (typeof matchCriteria) {
+    case "string":
+      let id = getAccessibleDOMNodeID(acc);
+      if (id === matchCriteria) {
+        EventsLogger.log(`Event matches DOMNode id: ${id}`);
+        return true;
+      }
+      break;
+    case "function":
+      if (matchCriteria(event)) {
+        EventsLogger.log(
+          `Lambda function matches event: ${eventToString(event)}`
+        );
+        return true;
+      }
+      break;
+    default:
+      if (matchCriteria instanceof nsIAccessible) {
+        if (acc === matchCriteria) {
+          EventsLogger.log(`Event matches accessible: ${prettyName(acc)}`);
+          return true;
+        }
+      } else if (event.DOMNode == matchCriteria) {
+        EventsLogger.log(
+          `Event matches DOM node: ${prettyName(event.DOMNode)}`
+        );
+        return true;
+      }
+  }
+
+  return false;
+}
+
+/**
+ * A helper function that returns a promise that resolves when an accessible
+ * event of the given type with the given target (defined by its id or
+ * accessible) is observed.
+ * @param  {Number}                eventType        expected accessible event
+ *                                                  type
+ * @param  {String|nsIAccessible|Function}  matchCriteria  expected content
+ *                                                         element id
+ *                                                         for the event
+ * @param  {String}                message          Message to prepend to logging.
+ * @return {Promise}                                promise that resolves to an
+ *                                                  event
+ */
+function waitForEvent(eventType, matchCriteria, message) {
+  return new Promise(resolve => {
+    let eventObserver = {
+      observe(subject, topic, data) {
+        if (topic !== "accessible-event") {
+          return;
+        }
+
+        let event = subject.QueryInterface(nsIAccessibleEvent);
+        if (EventsLogger.enabled) {
+          // Avoid calling eventToString if the EventsLogger isn't enabled in order
+          // to avoid an intermittent crash (bug 1307645).
+          EventsLogger.log(eventToString(event));
+        }
+
+        // If event type does not match expected type, skip the event.
+        if (event.eventType !== eventType) {
+          return;
+        }
+
+        if (matchEvent(event, matchCriteria)) {
+          EventsLogger.log(
+            `Correct event type: ${eventTypeToString(eventType)}`
+          );
+          Services.obs.removeObserver(this, "accessible-event");
+          ok(
+            true,
+            `${message ? message + ": " : ""}Recieved ${eventTypeToString(
+              eventType
+            )} event`
+          );
+          resolve(event);
+        }
+      },
+    };
+    Services.obs.addObserver(eventObserver, "accessible-event");
+  });
+}
+
+class UnexpectedEvents {
+  constructor(unexpected) {
+    if (unexpected.length) {
+      this.unexpected = unexpected;
+      Services.obs.addObserver(this, "accessible-event");
+    }
+  }
+
+  observe(subject, topic, data) {
+    if (topic !== "accessible-event") {
+      return;
+    }
+
+    let event = subject.QueryInterface(nsIAccessibleEvent);
+
+    let unexpectedEvent = this.unexpected.find(
+      ([etype, criteria]) =>
+        etype === event.eventType && matchEvent(event, criteria)
+    );
+
+    if (unexpectedEvent) {
+      ok(false, `Got unexpected event: ${eventToString(event)}`);
+    }
+  }
+
+  stop() {
+    if (this.unexpected) {
+      Services.obs.removeObserver(this, "accessible-event");
+    }
+  }
+}
+
+/**
+ * A helper function that waits for a sequence of accessible events in
+ * specified order.
+ * @param {Array}   events          a list of events to wait (same format as
+ *                                   waitForEvent arguments)
+ * @param {String}  message         Message to prepend to logging.
+ * @param {Boolean} ordered         Events need to be recieved in given order.
+ * @param {Object}  invokerOrWindow a local window or a special content invoker
+ *                                   it takes a list of arguments and a task
+ *                                   function.
+ */
+async function waitForEvents(
+  events,
+  message,
+  ordered = false,
+  invokerOrWindow = null
+) {
+  let expected = events.expected || events;
+  // Next expected event index.
+  let currentIdx = 0;
+
+  let unexpectedListener = events.unexpected
+    ? new UnexpectedEvents(events.unexpected)
+    : null;
+
+  let results = await Promise.all(
+    expected.map((evt, idx) => {
+      const [eventType, matchCriteria] = evt;
+      return waitForEvent(eventType, matchCriteria, message).then(result => {
+        return [result, idx == currentIdx++];
+      });
+    })
+  );
+
+  if (unexpectedListener) {
+    let flushQueue = async win => {
+      // Flush all notifications or queued a11y events.
+      win.windowUtils.advanceTimeAndRefresh(100);
+
+      // Flush all DOM async events.
+      await new Promise(r => win.setTimeout(r, 0));
+
+      // Flush all notifications or queued a11y events resulting from async DOM events.
+      win.windowUtils.advanceTimeAndRefresh(100);
+
+      // Flush all notifications or a11y events that may have been queued in the last tick.
+      win.windowUtils.advanceTimeAndRefresh(100);
+
+      // Return refresh to normal.
+      win.windowUtils.restoreNormalRefresh();
+    };
+
+    if (invokerOrWindow instanceof Function) {
+      await invokerOrWindow([flushQueue.toString()], async _flushQueue => {
+        // eslint-disable-next-line no-eval, no-undef
+        await eval(_flushQueue)(content);
+      });
+    } else {
+      await flushQueue(invokerOrWindow ? invokerOrWindow : window);
+    }
+
+    unexpectedListener.stop();
+  }
+
+  if (ordered) {
+    ok(
+      results.every(([, isOrdered]) => isOrdered),
+      `${message ? message + ": " : ""}Correct event order`
+    );
+  }
+
+  return results.map(([event]) => event);
+}
+
+function waitForOrderedEvents(events, message) {
+  return waitForEvents(events, message, true);
+}
+
+function stateChangeEventArgs(id, state, isEnabled, isExtra = false) {
+  return [
+    EVENT_STATE_CHANGE,
+    e => {
+      e.QueryInterface(nsIAccessibleStateChangeEvent);
+      return (
+        e.state == state &&
+        e.isExtraState == isExtra &&
+        isEnabled == e.isEnabled &&
+        (typeof id == "string"
+          ? id == getAccessibleDOMNodeID(e.accessible)
+          : getAccessible(id) == e.accessible)
+      );
+    },
+  ];
+}
+
+function waitForStateChange(id, state, isEnabled, isExtra = false) {
+  return waitForEvent(...stateChangeEventArgs(id, state, isEnabled, isExtra));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Utility functions ported from events.js.
+
+/**
+ * This function selects all text in the passed-in element if it has an editor,
+ * before setting focus to it. This simulates behavio with the keyboard when
+ * tabbing to the element. This does explicitly what synthFocus did implicitly.
+ * This should be called only if you really want this behavior.
+ * @param  {string}  id  The element ID to focus
+ */
+function selectAllTextAndFocus(id) {
+  const elem = getNode(id);
+  if (elem.editor) {
+    elem.selectionStart = elem.selectionEnd = elem.value.length;
+  }
+
+  elem.focus();
+}