Add transformer support to Converters.

tests/lib/convert/streamed_conversion_json_decode1_test.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.
+
+import "package:expect/expect.dart";
+import 'dart:async';
+import 'dart:convert';
+import '../../async_helper.dart';
+
+final TESTS = [
+    [ 5, '5' ],
+    [ -42, '-42' ],
+    [ 3.14, '3.14' ],
+    [ true, 'true' ],
+    [ false, 'false' ],
+    [ null, 'null' ],
+    [ 'quote"or\'', '"quote\\"or\'"' ],
+    [ '', '""' ],
+    [ [], "[]" ],
+    [ [3, -4.5, true, "hi", false], '[3,-4.5,true,"hi",false]' ],
+    [ [null], "[null]" ],
+    [ [[null]], "[[null]]" ],
+    [ [[3]], "[[3]]" ],
+    [ {}, "{}" ],
+    [ { "x": 3, "y": 4.5, "z": "hi", "u": true, "v": false },
+      '{"x":3,"y":4.5,"z":"hi","u":true,"v":false}' ],
+    [ { "x": null }, '{"x":null}' ],
+    [ { "x": {} }, '{"x":{}}' ],
+    // Note that -0.0 won't be treated the same in JS. The Json spec seems to
+    // allow it, though.
+    [ { "hi there": 499, "'":-0.0 }, '{"hi there":499,"\'":-0.0}' ],
+    [ r'\foo', r'"\\foo"' ],
+  ];
+
+bool isJsonEqual(o1, o2) {
+  if (o1 == o2) return true;
+  if (o1 is List && o2 is List) {
+    if (o1.length != o2.length) return false;
+    for (int i = 0; i < o1.length; i++) {
+      if (!isJsonEqual(o1[i], o2[i])) return false;
+    }
+    return true;
+  }
+  if (o1 is Map && o2 is Map) {
+    if (o1.length != o2.length) return false;
+    for (var key in o1.keys) {
+      Expect.isTrue(key is String);
+      if (!o2.containsKey(key)) return false;
+      if (!isJsonEqual(o1[key], o2[key])) return false;
+    }
+    return true;
+  }
+  return false;
+}
+
+createStream(List<String> chunks) {

[Søren Gjesse, 2013/07/26 07:37:23]

Add return type Stream.

[floitsch, 2013/07/26 10:35:32]

Done.

+  var decoder = new JsonDecoder(null);
+  var controller;
+  controller = new StreamController(onListen: () {
+    chunks.forEach(controller.add);
+    controller.close();
+  });
+  return controller.stream.transform(decoder);
+}
+
+Stream decode(String str) {
+  return createStream([str]);
+}
+
+Stream decode2(String str) {
+  return createStream(str.split(""));
+}
+
+checkIsJsonEqual(expected, stream) {
+  asyncStart();
+  stream.single.then((o) {
+    Expect.isTrue(isJsonEqual(expected, o));
+    asyncEnd();
+  });
+}
+
+main() {
+  var tests = TESTS.expand((test) {
+    var object = test[0];
+    var string = test[1];
+    var longString = "                                                        "
+                     "                                                        "
+                     "$string"
+                     "                                                        "
+                     "                                                        ";
+    return [test, [object, longString]];
+  });
+  for (var test in TESTS) {
+    var o = test[0];
+    var string = test[1];
+    checkIsJsonEqual(o, decode(string));
+    checkIsJsonEqual(o, decode2(string));
+  }
+}