/// <summary>
/// Helper method to set value of either property or field
/// </summary>
/// <param name="result"></param>
/// <param name="memberType"></param>
/// <param name="memberInfo"></param>
/// <param name="value"></param>
private void SetMemberValue(Object result, Type memberType, MemberInfo memberInfo, object value)
{
if (memberInfo is PropertyInfo)
{
// set value of public property
((PropertyInfo)memberInfo).SetValue(
result,
JsonReader.CoerceType(memberType, value, this.index, this.AllowNullValueTypes),
null);
}
else if (memberInfo is FieldInfo)
{
// set value of public field
((FieldInfo)memberInfo).SetValue(
result,
JsonReader.CoerceType(memberType, value, this.index, this.AllowNullValueTypes));
}
// all other values are ignored
}
private static object CoerceType(Type targetType, object value, int index, bool allowNullValueTypes)
{
bool isNullable = JsonReader.IsNullable(targetType);
if (value == null)
{
if (allowNullValueTypes &&
targetType.IsValueType &&
!isNullable)
{
throw new JsonDeserializationException(String.Format(JsonReader.ErrorNullValueType, targetType.FullName), index);
}
return(value);
}
if (isNullable)
{
// nullable types have a real underlying struct
Type[] genericArgs = targetType.GetGenericArguments();
if (genericArgs.Length == 1)
{
targetType = genericArgs[0];
}
}
Type actualType = value.GetType();
if (targetType.IsAssignableFrom(actualType))
{
return(value);
}
if (targetType.IsEnum)
{
if (!Enum.IsDefined(targetType, value))
{
// if isn't a defined value perhaps it is the JsonName
foreach (FieldInfo field in targetType.GetFields())
{
string jsonName = JsonNameAttribute.GetJsonName(field);
if (((string)value).Equals(jsonName))
{
value = field.Name;
break;
}
}
}
if (value is String)
{
return(Enum.Parse(targetType, (string)value));
}
else
{
return(Convert.ChangeType(value, targetType));
}
}
if (actualType.IsArray && !targetType.IsArray)
{
return(JsonReader.CoerceArray(targetType, actualType, value, index, allowNullValueTypes));
}
if (value is String)
{
if (targetType == typeof(DateTime))
{
DateTime date;
if (DateTime.TryParse(
(string)value,
DateTimeFormatInfo.InvariantInfo,
DateTimeStyles.RoundtripKind | DateTimeStyles.AllowWhiteSpaces | DateTimeStyles.NoCurrentDateDefault,
out date))
{
return(date);
}
}
else if (targetType == typeof(Guid))
{
// try-catch is pointless since will throw upon generic conversion
return(new Guid((string)value));
}
else if (targetType == typeof(Uri))
{
Uri uri;
if (Uri.TryCreate((string)value, UriKind.RelativeOrAbsolute, out uri))
{
return(uri);
}
}
else if (targetType == typeof(Version))
{
// try-catch is pointless since will throw upon generic conversion
return(new Version((string)value));
}
}
else if (targetType == typeof(TimeSpan))
{
return(new TimeSpan((long)JsonReader.CoerceType(typeof(Int64), value, index, allowNullValueTypes)));
}
TypeConverter converter = TypeDescriptor.GetConverter(targetType);
if (converter.CanConvertFrom(actualType))
{
return(converter.ConvertFrom(value));
}
converter = TypeDescriptor.GetConverter(actualType);
if (converter.CanConvertTo(targetType))
{
return(converter.ConvertTo(value, targetType));
}
return(Convert.ChangeType(value, targetType));
}
public static object CoerceType(Type targetType, object value)
{
return(JsonReader.CoerceType(targetType, value, -1, false));
}
private object ReadNumber(Type expectedType)
{
bool hasDecimal = false;
bool hasExponent = false;
int start = this.index;
int precision = 0;
int exponent = 0;
// optional minus part
if (this.Source[this.index] == JsonReader.OperatorNegate)
{
// consume sign
this.index++;
if (this.index >= this.SourceLength || !Char.IsDigit(this.Source[this.index]))
{
throw new JsonDeserializationException(JsonReader.ErrorIllegalNumber, this.index);
}
}
// integer part
while ((this.index < this.SourceLength) && Char.IsDigit(this.Source[this.index]))
{
// consume digit
this.index++;
}
// optional decimal part
if ((this.index < this.SourceLength) && (this.Source[this.index] == '.'))
{
hasDecimal = true;
// consume decimal
this.index++;
if (this.index >= this.SourceLength || !Char.IsDigit(this.Source[this.index]))
{
throw new JsonDeserializationException(JsonReader.ErrorIllegalNumber, this.index);
}
// fraction part
while (this.index < this.SourceLength && Char.IsDigit(this.Source[this.index]))
{
// consume digit
this.index++;
}
}
// note the number of significant digits
precision = this.index - start - (hasDecimal ? 1 : 0);
// optional exponent part
if (this.index < this.SourceLength && (this.Source[this.index] == 'e' || this.Source[this.index] == 'E'))
{
hasExponent = true;
// consume 'e'
this.index++;
if (this.index >= this.SourceLength)
{
throw new JsonDeserializationException(JsonReader.ErrorIllegalNumber, this.index);
}
int expStart = this.index;
// optional minus/plus part
if (this.Source[this.index] == JsonReader.OperatorNegate || this.Source[this.index] == JsonReader.OperatorUnaryPlus)
{
// consume sign
this.index++;
if (this.index >= this.SourceLength || !Char.IsDigit(this.Source[this.index]))
{
throw new JsonDeserializationException(JsonReader.ErrorIllegalNumber, this.index);
}
}
else
{
if (!Char.IsDigit(this.Source[this.index]))
{
throw new JsonDeserializationException(JsonReader.ErrorIllegalNumber, this.index);
}
}
// exp part
while (this.index < this.SourceLength && Char.IsDigit(this.Source[this.index]))
{
// consume digit
this.index++;
}
Int32.TryParse(this.Source.Substring(expStart, this.index - expStart), NumberStyles.Integer,
NumberFormatInfo.InvariantInfo, out exponent);
}
// at this point, we have the full number string and know its characteristics
string numberString = this.Source.Substring(start, this.index - start);
if (!hasDecimal && !hasExponent && precision < 19)
{
// is Integer value
// parse as most flexible
decimal number = Decimal.Parse(
numberString,
NumberStyles.Integer,
NumberFormatInfo.InvariantInfo);
if (expectedType != null)
{
return(JsonReader.CoerceType(expectedType, number, this.index, this.AllowNullValueTypes));
}
if (number >= Int32.MinValue && number <= Int32.MaxValue)
{
// use most common
return((int)number);
}
if (number >= Int64.MinValue && number <= Int64.MaxValue)
{
// use more flexible
return((long)number);
}
// use most flexible
return(number);
}
else
{
// is Floating Point value
if (expectedType == typeof(Decimal))
{
// special case since Double does not convert to Decimal
return(Decimal.Parse(
numberString,
NumberStyles.Float,
NumberFormatInfo.InvariantInfo));
}
// use native EcmaScript number (IEEE 754)
double number = Double.Parse(
numberString,
NumberStyles.Float,
NumberFormatInfo.InvariantInfo);
if (expectedType != null)
{
return(JsonReader.CoerceType(expectedType, number, this.index, this.AllowNullValueTypes));
}
return(number);
}
}
private object ReadString(Type expectedType)
{
if (this.Source[this.index] != JsonReader.OperatorStringDelim &&
this.Source[this.index] != JsonReader.OperatorStringDelimAlt)
{
throw new JsonDeserializationException(JsonReader.ErrorExpectedString, this.index);
}
char startStringDelim = this.Source[this.index];
// consume opening quote
this.index++;
if (this.index >= this.SourceLength)
{
throw new JsonDeserializationException(JsonReader.ErrorUnterminatedString, this.index);
}
int start = this.index;
StringBuilder builder = new StringBuilder();
while (this.Source[this.index] != startStringDelim)
{
if (this.Source[this.index] == JsonReader.OperatorCharEscape)
{
// copy chunk before decoding
builder.Append(this.Source, start, this.index - start);
// consume escape char
this.index++;
if (this.index >= this.SourceLength)
{
throw new JsonDeserializationException(JsonReader.ErrorUnterminatedString, this.index);
}
// decode
switch (this.Source[this.index])
{
case '0':
{
// don't allow NULL char '\0'
// causes CStrings to terminate
break;
}
case 'b':
{
// backspace
builder.Append('\b');
break;
}
case 'f':
{
// formfeed
builder.Append('\f');
break;
}
case 'n':
{
// newline
builder.Append('\n');
break;
}
case 'r':
{
// carriage return
builder.Append('\r');
break;
}
case 't':
{
// tab
builder.Append('\t');
break;
}
case 'u':
{
// Unicode escape sequence
// e.g. Copyright: "\u00A9"
// unicode ordinal
int utf16;
if (this.index + 4 < this.SourceLength &&
Int32.TryParse(
this.Source.Substring(this.index + 1, 4),
NumberStyles.AllowHexSpecifier,
NumberFormatInfo.InvariantInfo,
out utf16))
{
builder.Append(Char.ConvertFromUtf32(utf16));
this.index += 4;
}
else
{
// using FireFox style recovery, if not a valid hex
// escape sequence then treat as single escaped 'u'
// followed by rest of string
builder.Append(this.Source[this.index]);
}
break;
}
default:
{
builder.Append(Source[this.index]);
break;
}
}
this.index++;
if (this.index >= this.SourceLength)
{
throw new JsonDeserializationException(JsonReader.ErrorUnterminatedString, this.index);
}
start = this.index;
}
else
{
// next char
index++;
if (this.index >= this.SourceLength)
{
throw new JsonDeserializationException(JsonReader.ErrorUnterminatedString, this.index);
}
}
}
// copy rest of string
builder.Append(this.Source, start, this.index - start);
// consume closing quote
this.index++;
if (expectedType != null && expectedType != typeof(String))
{
return(JsonReader.CoerceType(expectedType, builder.ToString(), this.index, this.AllowNullValueTypes));
}
return(builder.ToString());
}
private static object CoerceArray(Type targetType, Type arrayType, object value, int index, bool allowNullValueTypes)
{
// targetType serializes as a JSON array but is not an array
// assume is an ICollection / IEnumerable with AddRange, Add,
// or custom Constructor with which we can populate it
ConstructorInfo ctor = targetType.GetConstructor(Type.EmptyTypes);
if (ctor == null)
{
throw new JsonDeserializationException(JsonReader.ErrorDefaultCtor, index);
}
object collection = ctor.Invoke(null);
Array arrayValue = (Array)value;
// many ICollection types have an AddRange method
// which adds all items at once
MethodInfo method = targetType.GetMethod("AddRange");
ParameterInfo[] parameters = (method == null) ?
null : method.GetParameters();
Type paramType = (parameters == null || parameters.Length != 1) ?
null : parameters[0].ParameterType;
if (paramType != null &&
paramType.IsAssignableFrom(arrayType))
{
// add all members in one method
method.Invoke(
collection,
new object[] { arrayValue });
return(collection);
}
else
{
// many ICollection types have an Add method
// which adds items one at a time
method = targetType.GetMethod("Add");
parameters = (method == null) ?
null : method.GetParameters();
paramType = (parameters == null || parameters.Length != 1) ?
null : parameters[0].ParameterType;
if (paramType != null)
{
// loop through adding items to collection
foreach (object item in arrayValue)
{
method.Invoke(
collection,
new object[] {
JsonReader.CoerceType(paramType, item, index, allowNullValueTypes)
});
}
return(collection);
}
}
// many ICollection types take an IEnumerable or ICollection
// as a constructor argument. look through constructors for
// a compatible match.
ConstructorInfo[] ctors = targetType.GetConstructors();
foreach (ConstructorInfo ctor2 in ctors)
{
ParameterInfo[] paramList = ctor2.GetParameters();
if (paramList.Length == 1 &&
paramList[0].ParameterType.IsAssignableFrom(arrayType))
{
try
{
// invoke first constructor that can take this value as an argument
return(ctor2.Invoke(
new object[] { value }
));
}
catch
{
// there might exist a better match
continue;
}
}
}
return(Convert.ChangeType(value, targetType));
}
