std::string GetStrFromKeyPress()

in src/keyboard_win.cc [29:64]

• 26 lines of code
• 10 McCabe index (conditional complexity)

std::string GetStrFromKeyPress(UINT key_code, int modifiers, BYTE *keyboard_state, UINT clear_key_code, UINT clear_scan_code) {
  memset(keyboard_state, 0, 256);

  if (modifiers & kShiftKeyModifierMask) {
    keyboard_state[VK_SHIFT] |= 0x80;
  }

  if (modifiers & kControlKeyModifierMask) {
    keyboard_state[VK_CONTROL] |= 0x80;
  }

  if (modifiers & kAltKeyModifierMask) {
    keyboard_state[VK_MENU] |= 0x80;
  }

  UINT scan_code = ::MapVirtualKeyW(key_code, MAPVK_VK_TO_VSC);

  wchar_t chars[5];
  int code = ::ToUnicode(key_code, scan_code, keyboard_state, chars, 4, 0);

  if (code == -1) {
    // dead key
    if (chars[0] == 0 || iswcntrl(chars[0])) {
      return std::string();
    }
    code = 1;
  }

  ClearKeyboardBuffer(clear_key_code, clear_scan_code, keyboard_state);

  if (code <= 0 || (code == 1 && iswcntrl(chars[0]))) {
    return std::string();
  }

  return vscode_keyboard::UTF16toUTF8(chars, code);
}