unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/lib/convert/converter.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.convert;
-
-/**
- * A [Converter] converts data from one representation into another.
- *
- * It is recommended that implementations of `Converter` extend this class,
- * to inherit any further methods that may be added to the class.
- */
-abstract class Converter<S, T> implements StreamTransformer/*<S, T>*/ {
-  const Converter();
-
-  /**
-   * Converts [input] and returns the result of the conversion.
-   */
-  T convert(S input);
-
-  /**
-   * Fuses `this` with [other].
-   *
-   * Encoding with the resulting converter is equivalent to converting with
-   * `this` before converting with `other`.
-   */
-  Converter<S, dynamic/*=TT*/> fuse/*<TT>*/(
-      Converter<T, dynamic/*=TT*/> other) {
-    return new _FusedConverter<S, T, dynamic/*=TT*/>(this, other);
-  }
-
-  /**
-   * Starts a chunked conversion.
-   *
-   * The returned sink serves as input for the long-running conversion. The
-   * given [sink] serves as output.
-   */
-  Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) {
-    throw new UnsupportedError(
-        "This converter does not support chunked conversions: $this");
-  }
-
-  Stream/*<T>*/ bind(Stream/*<S>*/ stream) {
-    return new Stream/*<T>*/.eventTransformed(
-        stream,
-        (EventSink sink) => new _ConverterStreamEventSink(this, sink));
-  }
-}
-
-/**
- * Fuses two converters.
- *
- * For a non-chunked conversion converts the input in sequence.
- */
-class _FusedConverter<S, M, T> extends Converter<S, T> {
-  final Converter<S, M> _first;
-  final Converter<M, T> _second;
-
-  _FusedConverter(this._first, this._second);
-
-  T convert(S input) => _second.convert(_first.convert(input));
-
-  Sink/*<S>*/ startChunkedConversion(Sink/*<T>*/ sink) {
-    return _first.startChunkedConversion(_second.startChunkedConversion(sink));
-  }
-}