public void ReadSimpleTypesFromYamlParser()
{
// The .NET SDK allows flag data to be read from a YAML file by first running it through a YAML
// parser, which produces types like Dictionary, and then feeding that into JReader. So we'll
// verify that a basic use case like that works, using YamlDotNet.
var yamlContent = @"
---
flags:
flag1:
key: flag1
""on"": true
version: 1
fallthrough:
variation: 2
variations:
- fall
- ""off""
- ""on""
flagValues:
flag2: value2
segments:
seg1:
key: seg1
version: 1
include: [""user1""]
";
var yaml = new YamlDotNet.Serialization.DeserializerBuilder().Build();
var dataIn = yaml.Deserialize <object>(yamlContent);
var r = JReader.FromAdapter(ReaderAdapters.FromSimpleTypes(dataIn));
var dataOut = JsonStreamConvert.ConvertSimpleTypes.ReadJson(ref r);
var jsonOut = JsonStreamConvert.SerializeObject(dataOut, JsonStreamConvert.ConvertSimpleTypes);
var expectedJson = @"{
""flags"": {
""flag1"": {
""key"": ""flag1"",
""on"": ""true"",
""version"": ""1"",
""fallthrough"": { ""variation"": ""2"" },
""variations"": [ ""fall"", ""off"", ""on"" ]
}
},
""flagValues"": { ""flag2"": ""value2"" },
""segments"": {
""seg1"": { ""key"": ""seg1"", ""version"": ""1"", ""include"": [""user1""] }
}
}";
// Note that YamlDotNet parses all the booleans and numbers as strings; that's why we provide a
// type coercion option.
TestUtil.AssertJsonEqual(expectedJson, jsonOut);
}
public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
// Unfortunately we can't hook directly into an existing Utf8JsonReader, because JReader (like any
// other type) isn't allowed to retain a reference to a ref struct outside of itself. So we have
// to parse out the next JSON value or tree all at once, and then wrap it in a delegate object
// that a JReader can read from. That's less efficient than reading directly from the original
// reader, due to 1. preallocating the value struct(s) and 2. the overhead of JReader calling the
// delegate, but it's still better than actually parsing the JSON twice.
using (JsonDocument jsonDocument = JsonDocument.ParseValue(ref reader))
{
var readerWrapper = JReader.FromAdapter(ReaderAdapters.FromJsonElement(jsonDocument.RootElement));
return((T)_jsonStreamConverter.ReadJson(ref readerWrapper));
}
}
public void ReadFromSimpleTypes()
{
var value = new List <object>
{
null,
true,
1,
(long)2,
3,
(long)4,
(float)5.5,
(double)6.5,
"x",
new Dictionary <string, object> {
{ "a", 1 }
},
new Dictionary <object, object> {
{ "b", 2 }
}
};
var r = JReader.FromAdapter(ReaderAdapters.FromSimpleTypes(value));
var arr = r.Array();
Assert.True(arr.Next(ref r));
r.Null();
Assert.True(arr.Next(ref r));
Assert.True(r.Bool());
Assert.True(arr.Next(ref r));
Assert.Equal(1, r.Int());
Assert.True(arr.Next(ref r));
Assert.Equal(2, r.Int());
Assert.True(arr.Next(ref r));
Assert.Equal(3, r.Long());
Assert.True(arr.Next(ref r));
Assert.Equal(4, r.Long());
Assert.True(arr.Next(ref r));
Assert.Equal(5.5, r.Double());
Assert.True(arr.Next(ref r));
Assert.Equal(6.5, r.Double());
Assert.True(arr.Next(ref r));
Assert.Equal("x", r.String());
Assert.True(arr.Next(ref r));
var obj1 = r.Object();
Assert.True(obj1.Next(ref r));
Assert.Equal("a", obj1.Name.ToString());
Assert.Equal(1, r.Int());
Assert.False(obj1.Next(ref r));
Assert.True(arr.Next(ref r));
var obj2 = r.Object();
Assert.True(obj2.Next(ref r));
Assert.Equal("b", obj2.Name.ToString());
Assert.Equal(2, r.Int());
Assert.False(obj2.Next(ref r));
Assert.False(arr.Next(ref r));
Assert.True(r.EOF);
}
private string ParseString(IReaderAdapter adapter)
{
var r = JReader.FromAdapter(adapter);
return(r.String());
}
private double ParseDouble(IReaderAdapter adapter)
{
var r = JReader.FromAdapter(adapter);
return(r.Double());
}
private bool ParseBool(IReaderAdapter adapter)
{
var r = JReader.FromAdapter(adapter);
return(r.Bool());
}
