Migrate dart2js stubs for dart:io

tool/input_sdk/lib/io/io_sink.dart

+// 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.
+
+part of dart.io;
+
+/**
+ * A combined byte and text output.
+ *
+ * An [IOSink] combines a [StreamSink] of bytes with a [StringSink],
+ * and allows easy output of both bytes and text.
+ *
+ * Writing text ([write]) and adding bytes ([add]) may be interleaved freely.
+ *
+ * While a stream is being added using [addStream], any further attempts
+ * to add or write to the [IOSink] will fail until the [addStream] completes.
+ *
+ * If data is added to the [IOSink] after the sink is closed, the data will be
+ * ignored. Use the [done] future to be notified when the [IOSink] is closed.
+ */
+abstract class IOSink implements StreamSink<List<int>>, StringSink {
+
+  /**
+   * Create an [IOSink] that outputs to a [target] [StreamConsumer] of bytes.
+   *
+   * Text written to [StreamSink] methods is encoded to bytes using [encoding]
+   * before being output on [target].
+   */
+  factory IOSink(StreamConsumer<List<int>> target,
+                 {Encoding encoding: UTF8})
+      => new _IOSinkImpl(target, encoding);
+
+  /**
+   * The [Encoding] used when writing strings. Depending on the
+   * underlying consumer this property might be mutable.
+   */
+  Encoding encoding;
+
+  /**
+   * Adds byte [data] to the target consumer, ignoring [encoding].
+   *
+   * The [encoding] does not apply to this method, and the `data` list is passed
+   * directly to the target consumer as a stream event.
+   *
+   * This function must not be called when a stream is currently being added
+   * using [addStream].
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   *
+   * The data list should not be modified after it has been passed to `add`.
+   */
+  void add(List<int> data);
+
+  /**
+   * Converts [obj] to a String by invoking [Object.toString] and
+   * [add]s the encoding of the result to the target consumer.
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   */
+  void write(Object obj);
+
+  /**
+   * Iterates over the given [objects] and [write]s them in sequence.
+   *
+   * If [separator] is provided, a `write` with the `separator` is performed
+   * between any two elements of objects`.
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   */
+  void writeAll(Iterable objects, [String separator = ""]);
+
+  /**
+   * Converts [obj] to a String by invoking [Object.toString] and
+   * writes the result to `this`, followed by a newline.
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   */
+  void writeln([Object obj = ""]);
+
+  /**
+   * Writes the character of [charCode].
+   *
+   * This method is equivalent to `write(new String.fromCharCode(charCode))`.
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   */
+  void writeCharCode(int charCode);
+
+  /**
+   * Passes the error to the target consumer as an error event.
+   *
+   * This function must not be called when a stream is currently being added
+   * using [addStream].
+   *
+   * This operation is non-blocking. See [flush] or [done] for how to get any
+   * errors generated by this call.
+   */
+  void addError(error, [StackTrace stackTrace]);
+
+  /**
+   * Adds all elements of the given [stream] to `this`.
+   *
+   * Returns a [Future] that completes when
+   * all elements of the given [stream] are added to `this`.
+   */
+  Future addStream(Stream<List<int>> stream);
+
+  /**
+   * Returns a [Future] that completes once all buffered data is accepted by the
+   * to underlying [StreamConsumer].
+   *
+   * This method must not be called while an [addStream] is incomplete.
+   *
+   * NOTE: This is not necessarily the same as the data being flushed by the
+   * operating system.
+   */
+  Future flush();
+
+  /**
+   * Close the target consumer.
+   */
+  Future close();
+
+  /**
+   * Get a future that will complete when the consumer closes, or when an
+   * error occurs. This future is identical to the future returned by
+   * [close].
+   */
+  Future get done;
+}
+
+class _StreamSinkImpl<T> implements StreamSink<T> {
+  final StreamConsumer<T> _target;
+  final Completer _doneCompleter = new Completer();
+  StreamController<T> _controllerInstance;
+  Completer _controllerCompleter;
+  bool _isClosed = false;
+  bool _isBound = false;
+  bool _hasError = false;
+
+  _StreamSinkImpl(this._target);
+
+  void add(T data) {
+    if (_isClosed) return;
+    _controller.add(data);
+  }
+
+  void addError(error, [StackTrace stackTrace]) {
+    _controller.addError(error, stackTrace);
+  }
+
+  Future addStream(Stream<T> stream) {
+    if (_isBound) {
+      throw new StateError("StreamSink is already bound to a stream");
+    }
+    _isBound = true;
+    if (_hasError) return done;
+    // Wait for any sync operations to complete.
+    Future targetAddStream() {
+      return _target.addStream(stream)
+          .whenComplete(() {
+            _isBound = false;
+          });
+    }
+    if (_controllerInstance == null) return targetAddStream();
+    var future = _controllerCompleter.future;
+    _controllerInstance.close();
+    return future.then((_) => targetAddStream());
+  }
+
+  Future flush() {
+    if (_isBound) {
+      throw new StateError("StreamSink is bound to a stream");
+    }
+    if (_controllerInstance == null) return new Future.value(this);
+    // Adding an empty stream-controller will return a future that will complete
+    // when all data is done.
+    _isBound = true;
+    var future = _controllerCompleter.future;
+    _controllerInstance.close();
+    return future.whenComplete(() {
+      _isBound = false;
+    });
+  }
+
+  Future close() {
+    if (_isBound) {
+      throw new StateError("StreamSink is bound to a stream");
+    }
+    if (!_isClosed) {
+      _isClosed = true;
+      if (_controllerInstance != null) {
+        _controllerInstance.close();
+      } else {
+        _closeTarget();
+      }
+    }
+    return done;
+  }
+
+  void _closeTarget() {
+    _target.close().then(_completeDoneValue, onError: _completeDoneError);
+  }
+
+  Future get done => _doneCompleter.future;
+
+  void _completeDoneValue(value) {
+    if (!_doneCompleter.isCompleted) {
+      _doneCompleter.complete(value);
+    }
+  }
+
+  void _completeDoneError(error, StackTrace stackTrace) {
+    if (!_doneCompleter.isCompleted) {
+      _hasError = true;
+      _doneCompleter.completeError(error, stackTrace);
+    }
+  }
+
+  StreamController<T> get _controller {
+    if (_isBound) {
+      throw new StateError("StreamSink is bound to a stream");
+    }
+    if (_isClosed) {
+      throw new StateError("StreamSink is closed");
+    }
+    if (_controllerInstance == null) {
+      _controllerInstance = new StreamController<T>(sync: true);
+      _controllerCompleter = new Completer();
+      _target.addStream(_controller.stream).then((_) {
+        if (_isBound) {
+          // A new stream takes over - forward values to that stream.
+          _controllerCompleter.complete(this);
+          _controllerCompleter = null;
+          _controllerInstance = null;
+        } else {
+          // No new stream, .close was called. Close _target.
+          _closeTarget();
+        }
+      }, onError: (error, stackTrace) {
+        if (_isBound) {
+          // A new stream takes over - forward errors to that stream.
+          _controllerCompleter.completeError(error, stackTrace);
+          _controllerCompleter = null;
+          _controllerInstance = null;
+        } else {
+          // No new stream. No need to close target, as it has already
+          // failed.
+          _completeDoneError(error, stackTrace);
+        }
+      });
+   }
+    return _controllerInstance;
+  }
+}
+
+
+class _IOSinkImpl extends _StreamSinkImpl<List<int>> implements IOSink {
+  Encoding _encoding;
+  bool _encodingMutable = true;
+
+  _IOSinkImpl(StreamConsumer<List<int>> target, this._encoding)
+      : super(target);
+
+  Encoding get encoding => _encoding;
+
+  void set encoding(Encoding value) {
+    if (!_encodingMutable) {
+      throw new StateError("IOSink encoding is not mutable");
+    }
+    _encoding = value;
+  }
+
+  void write(Object obj) {
+    String string = '$obj';
+    if (string.isEmpty) return;
+    add(_encoding.encode(string));
+  }
+
+  void writeAll(Iterable objects, [String separator = ""]) {
+    Iterator iterator = objects.iterator;
+    if (!iterator.moveNext()) return;
+    if (separator.isEmpty) {
+      do {
+        write(iterator.current);
+      } while (iterator.moveNext());
+    } else {
+      write(iterator.current);
+      while (iterator.moveNext()) {
+        write(separator);
+        write(iterator.current);
+      }
+    }
+  }
+
+  void writeln([Object object = ""]) {
+    write(object);
+    write("\n");
+  }
+
+  void writeCharCode(int charCode) {
+    write(new String.fromCharCode(charCode));
+  }
+}