unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/lib/io/string_transformer.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;
-
-/// The current system encoding.
-///
-/// This us used for converting from bytes to/from String when
-/// communicating on stdin, stdout and stderr.
-///
-/// On Windows this will use the currently active code page for the
-/// conversion. On all other systems it will always use UTF-8.
-const SystemEncoding SYSTEM_ENCODING = const SystemEncoding();
-
-/**
- * The system encoding is the current code page on Windows and UTF-8 on
- * Linux and Mac.
- */
-class SystemEncoding extends Encoding {
-  const SystemEncoding();
-
-  String get name => 'system';
-
-  List<int> encode(String input) => encoder.convert(input);
-  String decode(List<int> encoded) => decoder.convert(encoded);
-
-  Converter<String, List<int>> get encoder {
-    if (Platform.operatingSystem == "windows") {
-      return const _WindowsCodePageEncoder();
-    } else {
-      return const Utf8Encoder();
-    }
-  }
-
-  Converter<List<int>, String> get decoder {
-    if (Platform.operatingSystem == "windows") {
-      return const _WindowsCodePageDecoder();
-    } else {
-      return const Utf8Decoder();
-    }
-  }
-}
-
-class _WindowsCodePageEncoder extends Converter<String, List<int>> {
-
-  const _WindowsCodePageEncoder();
-
-  List<int> convert(String input) {
-    List<int> encoded = _encodeString(input);
-    if (encoded == null) {
-      throw new FormatException("Invalid character for encoding");
-    }
-    return encoded;
-  }
-
-  /**
-   * Starts a chunked conversion.
-   */
-  StringConversionSink startChunkedConversion(Sink<List<int>> sink) {
-    return new _WindowsCodePageEncoderSink(sink);
-  }
-
-  external static List<int> _encodeString(String string);
-}
-
-class _WindowsCodePageEncoderSink extends StringConversionSinkBase {
-  // TODO(floitsch): provide more efficient conversions when the input is
-  // not a String.
-
-  final Sink<List<int>> _sink;
-
-  _WindowsCodePageEncoderSink(this._sink);
-
-  void close() {
-    _sink.close();
-  }
-
-  void add(String string) {
-    List<int> encoded = _WindowsCodePageEncoder._encodeString(string);
-    if (encoded == null) {
-      throw new FormatException("Invalid character for encoding");
-    }
-    _sink.add(encoded);
-  }
-
-  void addSlice(String source, int start, int end, bool isLast) {
-    if (start != 0 || end != source.length) {
-      source = source.substring(start, end);
-    }
-    add(source);
-    if (isLast) close();
-  }
-}
-
-
-class _WindowsCodePageDecoder extends Converter<List<int>, String> {
-
-  const _WindowsCodePageDecoder();
-
-  String convert(List<int> input) {
-    return _decodeBytes(input);
-  }
-
-  /**
-   * Starts a chunked conversion.
-   */
-  ByteConversionSink startChunkedConversion(Sink<String> sink) {
-    return new _WindowsCodePageDecoderSink(sink);
-  }
-
-  external static String _decodeBytes(List<int> bytes);
-}
-
-class _WindowsCodePageDecoderSink extends ByteConversionSinkBase {
-  // TODO(floitsch): provide more efficient conversions when the input is
-  // a slice.
-
-  final Sink<String> _sink;
-
-  _WindowsCodePageDecoderSink(this._sink);
-
-  void close() {
-    _sink.close();
-  }
-
-  void add(List<int> bytes) {
-    _sink.add(_WindowsCodePageDecoder._decodeBytes(bytes));
-  }
-}