Function handleKeyEvent

src/static/js/ace2_inner.ts:2675–3104

(evt)

  editorInfo.ace_isWordChar = isWordChar;

  const handleKeyEvent = (evt) => {
    if (!isEditable) return;
    const {type, charCode, keyCode, which, shiftKey} = evt;

    // If DOM3 support exists, ensure that the left ALT key was pressed. This
    // allows keyboard layouts with special meaning for right-alt-char to
    // continue working on Firefox / macOS.
    let altKey = evt.altKey;
    if (evt.originalEvent.location !== undefined) {
        altKey = altKey && evt.originalEvent.location === evt.originalEvent.DOM_KEY_LOCATION_LEFT;
    }

    // Don't take action based on modifier keys going up and down.
    // Modifier keys do not generate "keypress" events.
    // 224 is the command-key under Mac Firefox.
    // 91 is the Windows key in IE; it is ASCII for open-bracket but isn't the keycode for that key
    // 20 is capslock in IE.
    const isModKey = !charCode && (type === 'keyup' || type === 'keydown') &&
        (keyCode === 16 || keyCode === 17 || keyCode === 18 ||
         keyCode === 20 || keyCode === 224 || keyCode === 91);
    if (isModKey) return;

    // If the key is a keypress and the browser is opera and the key is enter,
    // do nothign at all as this fires twice.
    if (keyCode === 13 && browser.opera && type === 'keypress') {
      // This stops double enters in Opera but double Tabs still show on single
      // tab keypress, adding keyCode == 9 to this doesn't help as the event is fired twice
      return;
    }

    const isTypeForSpecialKey = browser.safari || browser.chrome || browser.firefox
      ? type === 'keydown' : type === 'keypress';
    const isTypeForCmdKey = browser.safari || browser.chrome || browser.firefox
      ? type === 'keydown' : type === 'keypress';

    let stopped = false;

    inCallStackIfNecessary('handleKeyEvent', function () {
      if (type === 'keypress' || (isTypeForSpecialKey && keyCode === 13 /* return*/)) {
        // in IE, special keys don't send keypress, the keydown does the action
        if (!outsideKeyPress(evt)) {
          evt.preventDefault();
          stopped = true;
        }
      } else if (evt.key === 'Dead') {
        // If it's a dead key we don't want to do any Etherpad behavior.
        stopped = true;
        return true;
      } else if (type === 'keydown') {
        outsideKeyDown(evt);
      }
      let specialHandled = false;
      if (!stopped) {
        const specialHandledInHook = hooks.callAll('aceKeyEvent', {
          callstack: currentCallStack,
          editorInfo,
          rep,
          documentAttributeManager,