Function _map_keycode

app/js_to_hid.py:192–206

(keystroke)

def _map_keycode(keystroke):
    # If the current key press is a modifier key and it's the *only* modifier
    # being pressed, treat it as a special case where we remap the HID code to
    # KEYCODE_NONE. This is based on a report that certain KVMs only recognize
    # a modifier keystroke if the HID code is KEYCODE_NONE, but we should verify
    # that it matches behavior from normal USB keyboards.
    if (keystroke.code in _MODIFIER_KEYCODES and
            _count_modifiers(keystroke) == 1):
        return hid.KEYCODE_NONE

    try:
        return _MAPPING[keystroke.code]
    except KeyError as e:
        raise UnrecognizedKeyCodeError(
            f'Unrecognized key code {keystroke.key} {keystroke.code}') from e


def _count_modifiers(keystroke):