private static void SkipAsArray(JsonReader reader)
{
var part = new BufferPart();
var firstPass = true;
while (true)
{
var token = reader.Read(ref part, out var _);
if (token == JsonToken.ArrayEnd && firstPass)
{
return;
}
SkipFromCurrent(reader, token);
token = reader.Read(ref part, out var _);
if (token == JsonToken.ArrayEnd)
{
return;
}
if (token != JsonToken.ValueSeparator)
{
throw Exceptions.BadToken(reader, token, JsonToken.ValueSeparator);
}
firstPass = false;
}
}
public static void SkipNext(JsonReader reader)
{
var part = new BufferPart();
var token = reader.Read(ref part, out var _);
SkipFromCurrent(reader, token);
}
private static void SkipAsObject(JsonReader reader)
{
var part = new BufferPart();
var firstPass = true;
while (true)
{
var token = reader.Read(ref part, out var _);
if (token == JsonToken.ObjectEnd && firstPass)
{
return;
}
if (token != JsonToken.String)
{
throw Exceptions.BadToken(reader, token, JsonToken.String);
}
AssertToken(JsonToken.NameSeparator, reader, ref part);
SkipNext(reader);
token = reader.Read(ref part, out var _);
if (token == JsonToken.ObjectEnd)
{
return;
}
if (token != JsonToken.ValueSeparator)
{
throw Exceptions.BadToken(reader, token, JsonToken.ValueSeparator);
}
firstPass = false;
}
}
private static Func <DeserializationContext, object> ForEnum(Type type, Func <Type, TypeDescriptor> descriptorSource)
{
var underlyingType = Enum.GetUnderlyingType(type);
var descriptor = descriptorSource(underlyingType);
var enumValues = new Dictionary <string, object>();
var toUnderlying = ReflectionUtils.BuildCaster(underlyingType);
foreach (var value in Enum.GetValues(type))
{
enumValues[value.ToString()] = value;
enumValues[toUnderlying(value).ToString()] = value;
}
return(context =>
{
var reader = context.Reader;
if (reader.PeekToken().HasFlag(JsonToken.Number))
{
return Enum.ToObject(type, descriptor.Reader(context));
}
var bufferPart = new BufferPart();
var token = reader.Read(ref bufferPart, out var text);
if (token != JsonToken.String)
{
throw Exceptions.BadToken(reader, token, JsonToken.String | JsonToken.Number);
}
return enumValues.TryGetValue(text, out var value)
? value
: throw new JsonException($"Unknown enum value '{text}' near line {reader.Line}, column {reader.Column}.");
});
}
public static string ReadString(JsonReader reader)
{
var part = new BufferPart();
var token = reader.Read(ref part, out var buffer);
if (token == JsonToken.Null)
{
return(null);
}
if (token == JsonToken.String)
{
return(buffer);
}
if (token.HasFlag(JsonToken.Number))
{
return(part.Text.Substring(part.Start, part.Length));
}
if (token == JsonToken.True)
{
return("true");
}
if (token == JsonToken.False)
{
return("false");
}
throw Exceptions.BadFormat(reader, "string value");
}
private static void AssertToken(JsonToken expected, JsonReader reader, ref BufferPart buffer)
{
var token = reader.Read(ref buffer, out var _);
if (!token.HasFlag(expected))
{
throw Exceptions.BadToken(reader, token, expected);
}
}
private static Func <DeserializationContext, object> ForCollection(Type type, Func <Type, TypeDescriptor> descriptorSource)
{
var element = ReflectionUtils.FindCollectionElementType(type);
var constructor = ReflectionUtils.BuildConstructor(typeof(List <>).MakeGenericType(element));
var elementDescriptor = descriptorSource(element);
return(context =>
{
var reader = context.Reader;
var bufferPart = new BufferPart();
var token = reader.Read(ref bufferPart, out var _);
if (token == JsonToken.Null)
{
return null;
}
var target = (IList)constructor();
if (token != JsonToken.ArrayStart)
{
throw Exceptions.BadToken(reader, token, JsonToken.ObjectStart);
}
var finalizer = type.IsArray
? new Func <IList, object>(i =>
{
var array = Array.CreateInstance(element, i.Count);
i.CopyTo(array, 0);
return array;
})
: null;
var isFirst = true;
while (true)
{
if (reader.PeekToken() == JsonToken.ArrayEnd)
{
reader.Read(ref bufferPart, out var _);
return finalizer != null?finalizer(target) : target;
}
if (!isFirst)
{
token = reader.Read(ref bufferPart, out var _);
if (token != JsonToken.ValueSeparator)
{
throw Exceptions.BadToken(reader, token, JsonToken.ValueSeparator);
}
}
var item = elementDescriptor.Reader(context);
target.Add(item);
isFirst = false;
}
});
}
private static T ParseString <T>(JsonReader reader, Func <string, T?> parser) where T : struct
{
var part = new BufferPart();
var token = reader.Read(ref part, out var buffer);
if (token != JsonToken.String)
{
throw Exceptions.BadFormat(reader, "string value");
}
var result = parser(buffer);
return(result ?? throw Exceptions.BadFormat(reader, "string value"));
}
private static T ParseNumber <T>(JsonReader reader, Func <string, T?> parser) where T : struct
{
var part = new BufferPart();
var token = reader.Read(ref part, out var buffer);
if (token.HasFlag(JsonToken.Number))
{
return(parser(part.Text.Substring(part.Start, part.Length)) ?? throw Exceptions.BadFormat(reader, "string value"));
}
if (token != JsonToken.String)
{
throw Exceptions.BadFormat(reader, "string value");
}
return(parser(buffer) ?? throw Exceptions.BadFormat(reader, "string value"));
}
public static bool ReadBool(JsonReader reader)
{
var part = new BufferPart();
var token = reader.Read(ref part, out var buffer);
if (token == JsonToken.True)
{
return(true);
}
if (token == JsonToken.False)
{
return(false);
}
if (token.HasFlag(JsonToken.Number))
{
if (part.Length == 1)
{
return(part.Text[part.Start] != '0');
}
var text = part.Text.Substring(part.Start, part.Length);
if (token.HasFlag(JsonToken.NumberFloat))
{
return(double.TryParse(text, Base10WithExponent, CultureInfo.InvariantCulture, out var value)
? value != 0
: throw Exceptions.BadFormat(reader, "double value"));
}
return(long.TryParse(text, out var result) ? result != 0 : throw Exceptions.BadFormat(reader, "numeric value"));
}
if (token == JsonToken.String)
{
try
{
return(Convert.ToBoolean(buffer, CultureInfo.InvariantCulture));
}
catch (FormatException)
{
throw Exceptions.BadFormat(reader, "bool value");
}
}
throw Exceptions.BadToken(reader, token, JsonToken.False | JsonToken.True);
}
private static Func <DeserializationContext, object> ForNullable(Type underlyingType, Func <Type, TypeDescriptor> descriptorSource)
{
var descriptor = descriptorSource(underlyingType);
return(context =>
{
var reader = context.Reader;
if (reader.PeekToken() != JsonToken.Null)
{
return descriptor.Reader(context);
}
var bufferPart = new BufferPart();
var token = reader.Read(ref bufferPart, out var _);
if (token != JsonToken.Null)
{
throw Exceptions.BadToken(reader, token, JsonToken.Null);
}
return null;
});
}
public static int ReadInt(JsonReader reader)
{
var part = new BufferPart();
var token = reader.Read(ref part, out var buffer);
int value;
if (token == JsonToken.String)
{
return(int.TryParse(buffer, out value) ? value : throw Exceptions.BadFormat(reader, "integer value"));
}
if (!token.HasFlag(JsonToken.Number))
{
throw Exceptions.BadToken(reader, token, JsonToken.Number);
}
if (token.HasFlag(JsonToken.NumberFloat) || token.HasFlag(JsonToken.NumberExponent))
{
throw Exceptions.BadFormat(reader, "integer value");
}
return(Parsing.TryParseBase10Int(part.Text, part.Start, part.Length, out value)
? value
: throw Exceptions.BadFormat(reader, "integer value"));
}
public JsonToken Read(ref BufferPart bufferPart, out string buffer)
{
SkipWhitespace();
bufferPart.Text = _buffer.Text;
bufferPart.Start = _buffer.Position;
bufferPart.Length = -1;
buffer = null;
var current = _buffer.Peek();
if (current == '\uffff')
{
return(JsonToken.End);
}
switch (current)
{
case 't':
ConsumeMatchingContent("true");
return(JsonToken.True);
case 'f':
ConsumeMatchingContent("false");
return(JsonToken.False);
case 'n':
ConsumeMatchingContent("null");
return(JsonToken.Null);
case '"':
_buffer.Advance();
buffer = ReadString();
return(JsonToken.String);
case '[':
_buffer.Advance();
return(JsonToken.ArrayStart);
case ']':
_buffer.Advance();
return(JsonToken.ArrayEnd);
case '{':
_buffer.Advance();
return(JsonToken.ObjectStart);
case '}':
_buffer.Advance();
return(JsonToken.ObjectEnd);
case ':':
_buffer.Advance();
return(JsonToken.NameSeparator);
case ',':
_buffer.Advance();
return(JsonToken.ValueSeparator);
default:
if (current == '-' || (current >= '0' && current <= '9'))
{
var numberType = ReadNumber(out var length);
bufferPart.Length = length;
return(JsonToken.Number | numberType);
}
throw new JsonException($"Unexpected token '{current}' at line {_buffer.Line}, column {_buffer.Column}.");
}
}
private static IEnumerable <DeferredEntry> ReadProperties(object target, DeserializationContext context, IReadOnlyDictionary <string, PropertyBinding> all)
{
var bufferPart = new BufferPart();
var reader = context.Reader;
List <DeferredEntry> deferred = null;
while (true)
{
var token = reader.Read(ref bufferPart, out var propertyName);
if (token == JsonToken.ObjectEnd)
{
return(deferred);
}
if (token != JsonToken.String)
{
throw Exceptions.BadToken(reader, token, JsonToken.String);
}
var hasProperty = all.TryGetValue(propertyName, out var property);
token = reader.Read(ref bufferPart, out var _);
if (token != JsonToken.NameSeparator)
{
throw Exceptions.BadToken(reader, token, JsonToken.NameSeparator);
}
if (hasProperty)
{
ITypeSelector typeSelector = null;
var shouldDeffer = context.TypeSelectors?.TryGetValue(property.Descriptor.Type, out typeSelector) == true;
if (!shouldDeffer)
{
property.Setter(target, property.Descriptor.Reader(context));
}
else
{
var entry = new DeferredEntry
{
Selector = typeSelector,
Binding = property,
Snapshot = reader.TakeSnapshot()
};
ValueSkipper.SkipNext(reader);
if (deferred == null)
{
deferred = new List <DeferredEntry>();
}
deferred.Add(entry);
}
}
else
{
ValueSkipper.SkipNext(reader);
}
token = reader.Read(ref bufferPart, out var _);
if (token == JsonToken.ObjectEnd)
{
return(deferred);
}
if (token != JsonToken.ValueSeparator)
{
throw Exceptions.BadToken(reader, token, JsonToken.ValueSeparator);
}
}
}
private static Func <DeserializationContext, object> ForComplex(Type type, TypeOptions options, Func <Type, TypeDescriptor> descriptorSource)
{
var info = type.GetTypeInfo();
if (info.IsClass && info.GetConstructor(Type.EmptyTypes) == null)
{
return(reader => throw new JsonException(info.IsAbstract
? $"Type {type} is abstract. Add {nameof(ITypeSelector)} to {nameof(SerializationSettings)} in order to deserialize this type."
: $"Type {type} must define public parameterless constructor."));
}
var properties = info
.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(i => i.SetMethod != null && i.GetMethod != null)
.Select(i => new { Property = (MemberInfo)i, Setter = ReflectionUtils.BuildSetter(i), Descriptor = descriptorSource(i.PropertyType) });
var fields = info
.GetFields(BindingFlags.Instance | BindingFlags.Public)
.Select(i => new { Property = (MemberInfo)i, Setter = ReflectionUtils.BuildFieldSetter(i), Descriptor = descriptorSource(i.FieldType) });
var all = properties
.Concat(fields)
.SelectMany(i => JsonNames(i.Property).Select(j => new PropertyBinding {
Name = j, Setter = i.Setter, Descriptor = i.Descriptor
}))
.GroupBy(i => i.Name)
.ToDictionary(i => i.Key, i => i.First());
var constructor = info.IsClass
? ReflectionUtils.BuildConstructor(type)
: () => Activator.CreateInstance(typeof(Box <>).MakeGenericType(type));
//struct types are internally wrapped into Box<T> type (see ReflectionUtils)
var unwrapper = !info.IsClass
? new Func <object, object>(i => ((IBox)i).Value)
: null;
return(context =>
{
var bufferPart = new BufferPart();
var reader = context.Reader;
var token = reader.Read(ref bufferPart, out var _);
if (token == JsonToken.Null)
{
return info.IsClass ? (object)null : throw new JsonException($"Unable to assign null value to struct type near line {reader.Line}, column {reader.Column}.");
}
if (token != JsonToken.ObjectStart)
{
throw Exceptions.BadToken(reader, token, JsonToken.ObjectStart);
}
var target = constructor();
var deferred = ReadProperties(target, context, all);
var unwrapped = unwrapper != null?unwrapper(target) : target;
if (deferred == null)
{
return unwrapped;
}
foreach (var entry in deferred)
{
var runtimeType = entry.Selector.FindPropertyType(entry.Binding.Name, unwrapped);
var descriptor = context.Catalog.GetDescriptor(runtimeType, options);
using (reader.LoadSnapshot(entry.Snapshot))
entry.Binding.Setter(target, descriptor.Reader(context));
}
return unwrapper != null?unwrapper(target) : target;
});
}
