Add Latin-1 converters to convert library.

tests/lib/convert/latin1_test.dart

+// Copyright (c) 2012, 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.
+
+import "package:expect/expect.dart";
+import 'dart:convert';
+
+var latin1Strings = [

[floitsch, 2013/08/21 14:07:33]

It would be good to create additional tests from this.
longer (duplications), for example.
See unicode_tests.dart for some examples.

[Lasse Reichstein Nielsen, 2013/08/22 08:28:37]

Wouldn't it be great if String had an operator*, so I could just write 
  "blåbærgrød" * 100
?!?

Added longer concatenations of the example strings as well.

+  "pure ascii",
+  "blåbærgrød",
+  "\x00 edge cases \xff"
+];
+
+var nonLatin1Strings = [
+  "Edge case \u{100}",
+  "Edge case super-BMP \u{10000}"
+];
+
+void main() {
+  testDirectConversions();
+  testChunkedConversions();
+}
+
+void testDirectConversions() {
+  for (var codec in [LATIN1, new Latin1Codec()]) {
+    for (var latin1String in latin1Strings) {
+      List bytes = codec.encoder.convert(latin1String);
+      Expect.listEquals(latin1String.codeUnits.toList(), bytes, latin1String);
+      String roundTripString = codec.decoder.convert(bytes);
+      Expect.equals(latin1String, roundTripString);
+      roundTripString = codec.decode(bytes);
+      Expect.equals(latin1String, roundTripString);
+    }
+
+    for (var nonLatin1String in nonLatin1Strings) {
+      Expect.throws(() {
+        print(codec.encoder.convert(nonLatin1String));
+      }, null, nonLatin1String);
+    }
+  }
+
+  var allowInvalidCodec = new Latin1Codec(allowInvalid: true);
+  var invalidBytes = [0, 1, 0xff, 0xdead, 0];
+  String decoded = allowInvalidCodec.decode(invalidBytes);
+  Expect.equals("\x00\x01\xFF\uFFFD\x00", decoded);
+  decoded = allowInvalidCodec.decoder.convert(invalidBytes);
+  Expect.equals("\x00\x01\xFF\uFFFD\x00", decoded);
+  decoded = LATIN1.decode(invalidBytes, allowInvalid: true);
+  Expect.equals("\x00\x01\xFF\uFFFD\x00", decoded);
+}
+
+List<int> encode(String str, int chunkSize,
+                 Converter<String, List<int>> converter) {
+  List<int> bytes = <int>[];
+  ChunkedConversionSink byteSink =
+      new ByteConversionSink.withCallback(bytes.addAll);
+  var stringConversionSink = converter.startChunkedConversion(byteSink);
+  for (int i = 0; i < str.length; i += chunkSize) {
+    if (i + chunkSize <= str.length) {
+      stringConversionSink.add(str.substring(i, i + chunkSize));
+    } else {
+      stringConversionSink.add(str.substring(i));
+    }
+  }
+  stringConversionSink.close();
+  return bytes;
+}
+
+String decode(List<int> bytes, int chunkSize,
+              Converter<List<int>, String> converter) {
+  StringBuffer buf = new StringBuffer();
+  var stringSink =
+      new StringConversionSink.fromStringSink(buf);
+  var byteConversionSink = converter.startChunkedConversion(stringSink);
+  for (int i = 0; i < bytes.length; i += chunkSize) {
+    if (i + chunkSize <= bytes.length) {
+      byteConversionSink.add(bytes.sublist(i, i + chunkSize));
+    } else {
+      byteConversionSink.add(bytes.sublist(i));
+    }
+  }
+  byteConversionSink.close();
+  return buf.toString();
+}
+
+void testChunkedConversions() {
+  // Check encoding.
+  for (var converter in [LATIN1.encoder,
+                         new Latin1Codec().encoder,
+                         new Latin1Encoder()]) {
+    for (int chunkSize in [1, 2, 5, 50]) {
+      for (var latin1String in latin1Strings) {
+        var units = latin1String.codeUnits.toList();
+        List bytes = encode(latin1String, chunkSize, converter);
+        Expect.listEquals(units, bytes);
+      }
+      for (var nonLatin1String in nonLatin1Strings) {
+        Expect.throws(() {
+          encode(nonLatin1Strings, chunkSize, converter);
+        });
+      }
+    }
+  }
+  // Check decoding.
+  for (var converter in [LATIN1.decoder,
+                         new Latin1Codec().decoder,
+                         new Latin1Decoder()]) {
+    for (int chunkSize in [1, 2, 5, 50]) {
+      for (var latin1String in latin1Strings) {
+        var units = latin1String.codeUnits.toList();
+        Expect.equals(latin1String, decode(units, chunkSize, converter));
+      }
+      for (var nonLatin1String in nonLatin1Strings) {
+        var units = nonLatin1String.codeUnits.toList();
+        Expect.throws(() {
+          decode(units, chunkSize, converter);
+        });
+      }
+    }
+  }
+}