internal static JsonToken ParseToken(Type type, string json)
{
if (JSONUtilities.IsNullableType(type))
{
type = Nullable.GetUnderlyingType(type);
}
if (type == typeof(string))
{
if (json.Length <= 2)
{
return(new JsonToken(JsonTokenType.String, String.Empty));
}
StringBuilder parseStringBuilder = new StringBuilder(json.Length);
for (int i = 1; i < json.Length - 1; ++i)
{
if (json[i] == '\\' && i + 1 < json.Length - 1)
{
int j = "\"\\nrtbf/".IndexOf(json[i + 1]);
if (j >= 0)
{
parseStringBuilder.Append("\"\\\n\r\t\b\f/"[j]);
++i;
continue;
}
if (json[i + 1] == 'u' && i + 5 < json.Length - 1)
{
UInt32 c = 0;
if (UInt32.TryParse(json.Substring(i + 2, 4), System.Globalization.NumberStyles.AllowHexSpecifier, null, out c))
{
parseStringBuilder.Append((char)c);
i += 5;
continue;
}
}
}
parseStringBuilder.Append(json[i]);
}
return(new JsonToken(JsonTokenType.String, parseStringBuilder.ToString()));
}
if (type.IsPrimitive)
{
var tokenType = GetTokenTypeForPrimitive(type);
var result = new object();
if (tokenType == JsonTokenType.Integer)
{
result = Convert.ChangeType(json, typeof(long), System.Globalization.CultureInfo.InvariantCulture);
}
else
{
result = Convert.ChangeType(json, type, System.Globalization.CultureInfo.InvariantCulture);
}
return(new JsonToken(tokenType, result));
}
if (type == typeof(decimal))
{
float result;
float.TryParse(json, System.Globalization.NumberStyles.Float, System.Globalization.CultureInfo.InvariantCulture, out result);
return(new JsonToken(JsonTokenType.Float, result));
}
if (json == "null")
{
return(new JsonToken(JsonTokenType.Null, null));
}
if (type.IsEnum)
{
if (json[0] == '"')
{
json = json.Substring(1, json.Length - 2);
}
try
{
if (long.TryParse(json, out var value))
{
return(new JsonToken(JsonTokenType.Integer, value));
}
else
{
return(new JsonToken(JsonTokenType.Integer, Convert.ToInt64(Enum.Parse(type, json, false))));
}
}
catch
{
return(new JsonToken(JsonTokenType.Integer, 0L));
}
}
if (type == typeof(DateTime))
{
if (json[0] == '"')
{
json = json.Substring(1, json.Length - 2).Replace("\\", "");
}
return(new JsonToken(JsonTokenType.String, json));
}
if (type == typeof(Byte[]))
{
// treat this as a string
if (json[0] == '"')
{
json = json.Substring(1, json.Length - 2);
}
return(new JsonToken(JsonTokenType.String, json));
}
if (type.IsArray)
{
Type arrayType = type.GetElementType();
if (json[0] != '[' || json[json.Length - 1] != ']')
{
return(new JsonToken(JsonTokenType.Null, null));
}
List <string> elems = Split(json);
var array = new JsonToken[elems.Count];
for (int i = 0; i < elems.Count; i++)
{
array[i] = ParseToken(arrayType, elems[i]);
}
splitArrayPool.Push(elems);
return(new JsonToken(JsonTokenType.Array, array));
}
if (type.GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IList <>)))
{
var generic = type.GetInterfaces().FirstOrDefault(i => i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IList <>));
Type listType = generic.GetGenericArguments()[0];
if (json[0] != '[' || json[json.Length - 1] != ']')
{
return(new JsonToken(JsonTokenType.Null, null));
}
List <string> elems = Split(json);
var array = new JsonToken[elems.Count];
for (int i = 0; i < elems.Count; i++)
{
array[i] = ParseToken(listType, elems[i]);
}
splitArrayPool.Push(elems);
return(new JsonToken(JsonTokenType.Array, array));
}
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Dictionary <,>))
{
Type keyType, valueType;
{
Type[] args = type.GetGenericArguments();
keyType = args[0];
valueType = args[1];
}
//Refuse to parse dictionary keys that aren't of type string
if (keyType != typeof(string))
{
return(new JsonToken(JsonTokenType.Null, null));
}
//Must be a valid dictionary element
if (json[0] != '{' || json[json.Length - 1] != '}')
{
return(new JsonToken(JsonTokenType.Null, null));
}
//The list is split into key/value pairs only, this means the split must be divisible by 2 to be valid JSON
List <string> elems = Split(json);
if (elems.Count % 2 != 0)
{
return(new JsonToken(JsonTokenType.Null, null));
}
var token = new JsonToken(JsonTokenType.Object, null);
for (int i = 0; i < elems.Count; i += 2)
{
if (elems[i].Length <= 2)
{
continue;
}
string keyValue = elems[i].Substring(1, elems[i].Length - 2);
token.AddKey(keyValue, ParseToken(valueType, elems[i + 1]));
}
return(token);
}
if (type == typeof(object))
{
return(ParseAnonymousToken(json));
}
if (json[0] == '{' && json[json.Length - 1] == '}')
{
return(ParseObjectToken(type, json));
}
return(new JsonToken(JsonTokenType.Null, null));
}
