runZoned<R> 静态方法

R runZoned<R>(
  1. R body(
      ),
    1. {
      1. Directory createDirectory(String
      )?,
    2. Directory getCurrentDirectory(
        )?,
      1. Directory setCurrentDirectory(
        1. Directory createDirectory(String
        )?,
      2. Directory getSystemTempDirectory(
          )?,
        1. File createFile(
          1. Directory createDirectory(String
          )?,
        2. Future<FileStat> stat(
          1. Directory createDirectory(String
          )?,
        3. FileStat statSync(
          1. Directory createDirectory(String
          )?,
        4. Future<bool> fseIdentical(
          1. Directory createDirectory(String,
          2. Directory createDirectory(String
          )?,
        5. bool fseIdenticalSync(
          1. Directory createDirectory(String,
          2. Directory createDirectory(String
          )?,
        6. Future<FileSystemEntityType> fseGetType(
          1. Directory createDirectory(String,
          2. bool
          )?,
        7. FileSystemEntityType fseGetTypeSync(
          1. Directory createDirectory(String,
          2. bool
          )?,
        8. Stream<FileSystemEvent> fsWatch(
          1. Directory createDirectory(String,
          2. int,
          3. bool
          )?,
        9. bool fsWatchIsSupported(
            )?,
          1. Link createLink(
            1. Directory createDirectory(String
            )?,
          2. Future<Socket> socketConnect(
            1. dynamic,
            2. int,
            3. {dynamic sourceAddress,
            4. int sourcePort,
            5. Duration? timeout}
            )?,
          3. Future<ConnectionTask<Socket>> socketStartConnect(
            1. dynamic,
            2. int,
            3. {dynamic sourceAddress,
            4. int sourcePort}
            )?,
          4. ServerSocket<Socket> serverSocketBind(
            1. dynamic,
            2. int,
            3. {int backlog,
            4. bool shared
            5. bool v6Only}
            )?,
          5. Stdin stdin(
              )?,
            1. Stdout stdout(
                )?,
              1. Stdout stderr(
                  )?}
                )

                在利用提供的覆盖项在一个新的Zone中运行 body。

                有关可选参数的作用，请参阅 IOOverrides 对应方法的文档。

                实现

                static R runZoned<R>(R body(),
    {
    // Directory
    Directory Function(String)? createDirectory,
    Directory Function()? getCurrentDirectory,
    void Function(String)? setCurrentDirectory,
    Directory Function()? getSystemTempDirectory,

    // File
    File Function(String)? createFile,

    // FileStat
    Future<FileStat> Function(String)? stat,
    FileStat Function(String)? statSync,

    // FileSystemEntity
    Future<bool> Function(String, String)? fseIdentical,
    bool Function(String, String)? fseIdenticalSync,
    Future<FileSystemEntityType> Function(String, bool)? fseGetType,
    FileSystemEntityType Function(String, bool)? fseGetTypeSync,

    // _FileSystemWatcher
    Stream<FileSystemEvent> Function(String, int, bool)? fsWatch,
    bool Function()? fsWatchIsSupported,

    // Link
    Link Function(String)? createLink,

    // Socket
    Future<Socket> Function(dynamic, int,
            {dynamic sourceAddress, int sourcePort, Duration? timeout})?
        socketConnect,
    Future<ConnectionTask<Socket>> Function(dynamic, int,
            {dynamic sourceAddress, int sourcePort})?
        socketStartConnect,

    // ServerSocket
    Future<ServerSocket> Function(dynamic, int,
            {int backlog, bool v6Only, bool shared})?
        serverSocketBind,

    // Standard Streams
    Stdin Function()? stdin,
    Stdout Function()? stdout,
    Stdout Function()? stderr}) {
  // Avoid building chains of override scopes. Just copy outer scope's
  // functions and `_previous`.
  var current = IOOverrides.current;
  _IOOverridesScope? currentScope;
  if (current is _IOOverridesScope) {
    currentScope = current;
    current = currentScope._previous;
  }
  IOOverrides overrides = new _IOOverridesScope(
    current,
    // Directory
    createDirectory ?? currentScope?._createDirectory,
    getCurrentDirectory ?? currentScope?._getCurrentDirectory,
    setCurrentDirectory ?? currentScope?._setCurrentDirectory,
    getSystemTempDirectory ?? currentScope?._getSystemTempDirectory,

    // File
    createFile ?? currentScope?._createFile,

    // FileStat
    stat ?? currentScope?._stat,
    statSync ?? currentScope?._statSync,

    // FileSystemEntity
    fseIdentical ?? currentScope?._fseIdentical,
    fseIdenticalSync ?? currentScope?._fseIdenticalSync,
    fseGetType ?? currentScope?._fseGetType,
    fseGetTypeSync ?? currentScope?._fseGetTypeSync,

    // _FileSystemWatcher
    fsWatch ?? currentScope?._fsWatch,
    fsWatchIsSupported ?? currentScope?._fsWatchIsSupported,

    // Link
    createLink ?? currentScope?._createLink,

    // Socket
    socketConnect ?? currentScope?._socketConnect,
    socketStartConnect ?? currentScope?._socketStartConnect,

    // ServerSocket
    serverSocketBind ?? currentScope?._serverSocketBind,

    // Standard streams
    stdin ?? currentScope?._stdin,
    stdout ?? currentScope?._stdout,
    stderr ?? currentScope?._stderr,
  );
  return dart_async
      .runZoned<R>(body, zoneValues: {_ioOverridesToken: overrides});
}