sdk/tests/lib/convert/chunked_conversion_json_encode1_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:convert';

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"' ],
  ];

class MyStringConversionSink extends StringConversionSinkBase {
  var buffer = new StringBuffer();
  var callback;

  MyStringConversionSink(this.callback);

  addSlice(str, start, end, bool isLast) {
    buffer.write(str.substring(start, end));
    if (isLast) close();
  }

  close() {
    callback(buffer.toString());
  }
}

String encode(Object o) {
  var result;
  var encoder = new JsonEncoder();
  ChunkedConversionSink stringSink =
      new MyStringConversionSink((x) => result = x);
  var objectSink = new JsonEncoder().startChunkedConversion(stringSink);
  objectSink.add(o);
  objectSink.close();
  return result;
}

String encode2(Object o) {
  var result;
  var encoder = new JsonEncoder();
  ChunkedConversionSink stringSink =
      new StringConversionSink.withCallback((x) => result = x);
  var objectSink = encoder.startChunkedConversion(stringSink);
  objectSink.add(o);
  objectSink.close();
  return result;
}

main() {
  for (var test in TESTS) {
    var o = test[0];
    var expected = test[1];
    Expect.equals(expected, encode(o));
    Expect.equals(expected, encode2(o));
  }
}