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watcher/lib/src/utils.dart

Index: watcher/lib/src/utils.dart
diff --git a/watcher/lib/src/utils.dart b/watcher/lib/src/utils.dart
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index 007c84c193f1bea55261659fd91058bf9a9678be..0000000000000000000000000000000000000000
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-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library watcher.utils;
-
-import 'dart:async';
-import 'dart:io';
-import 'dart:collection';
-
-/// Returns `true` if [error] is a [FileSystemException] for a missing
-/// directory.
-bool isDirectoryNotFoundException(error) {
-  if (error is! FileSystemException) return false;
-
-  // See dartbug.com/12461 and tests/standalone/io/directory_error_test.dart.
-  var notFoundCode = Platform.operatingSystem == "windows" ? 3 : 2;
-  return error.osError.errorCode == notFoundCode;
-}
-
-/// Returns the union of all elements in each set in [sets].
-Set unionAll(Iterable<Set> sets) =>
-    sets.fold(new Set(), (union, set) => union.union(set));
-
-/// Returns a buffered stream that will emit the same values as the stream
-/// returned by [future] once [future] completes.
-///
-/// If [future] completes to an error, the return value will emit that error and
-/// then close.
-///
-/// If [broadcast] is true, a broadcast stream is returned. This assumes that
-/// the stream returned by [future] will be a broadcast stream as well.
-/// [broadcast] defaults to false.
-Stream futureStream(Future<Stream> future, {bool broadcast: false}) {
-  var subscription;
-  var controller;
-
-  future = future.catchError((e, stackTrace) {
-    // Since [controller] is synchronous, it's likely that emitting an error
-    // will cause it to be cancelled before we call close.
-    if (controller != null) controller.addError(e, stackTrace);
-    if (controller != null) controller.close();
-    controller = null;
-  });
-
-  onListen() {
-    future.then((stream) {
-      if (controller == null) return;
-      subscription = stream.listen(
-          controller.add,
-          onError: controller.addError,
-          onDone: controller.close);
-    });
-  }
-
-  onCancel() {
-    if (subscription != null) subscription.cancel();
-    subscription = null;
-    controller = null;
-  }
-
-  if (broadcast) {
-    controller = new StreamController.broadcast(
-        sync: true, onListen: onListen, onCancel: onCancel);
-  } else {
-    controller = new StreamController(
-        sync: true, onListen: onListen, onCancel: onCancel);
-  }
-  return controller.stream;
-}
-
-/// Like [new Future], but avoids around issue 11911 by using [new Future.value]
-/// under the covers.
-Future newFuture(callback()) => new Future.value().then((_) => callback());
-
-/// Returns a [Future] that completes after pumping the event queue [times]
-/// times. By default, this should pump the event queue enough times to allow
-/// any code to run, as long as it's not waiting on some external event.
-Future pumpEventQueue([int times = 20]) {
-  if (times == 0) return new Future.value();
-  // We use a delayed future to allow microtask events to finish. The
-  // Future.value or Future() constructors use scheduleMicrotask themselves and
-  // would therefore not wait for microtask callbacks that are scheduled after
-  // invoking this method.
-  return new Future.delayed(Duration.ZERO, () => pumpEventQueue(times - 1));
-}
-
-/// A stream transformer that batches all events that are sent at the same time.
-///
-/// When multiple events are synchronously added to a stream controller, the
-/// [StreamController] implementation uses [scheduleMicrotask] to schedule the
-/// asynchronous firing of each event. In order to recreate the synchronous
-/// batches, this collates all the events that are received in "nearby"
-/// microtasks.
-class BatchedStreamTransformer<T> implements StreamTransformer<T, List<T>> {
-  Stream<List<T>> bind(Stream<T> input) {
-    var batch = new Queue();
-    return new StreamTransformer<T, List<T>>.fromHandlers(
-        handleData: (event, sink) {
-      batch.add(event);
-
-      // [Timer.run] schedules an event that runs after any microtasks that have
-      // been scheduled.
-      Timer.run(() {
-        if (batch.isEmpty) return;
-        sink.add(batch.toList());
-        batch.clear();
-      });
-    }, handleDone: (sink) {
-      if (batch.isNotEmpty) {
-        sink.add(batch.toList());
-        batch.clear();
-      }
-      sink.close();
-    }).bind(input);
-  }
-}