// Generate the MSIL to retrieve a value for a particular field or property from a IJsonReader
private static void GenerateGetJsonValue(JsonMemberInfo m, ILGenerator il)
{
Action <string> generateCallToHelper = helperName =>
{
// Call the helper
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, typeof(Emit).GetMethod(helperName, new Type[] { typeof(IJsonReader) }));
// Move to next token
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, typeof(IJsonReader).GetMethod("NextToken", new Type[] { }));
};
Type[] numericTypes = new Type[] {
typeof(int), typeof(uint), typeof(long), typeof(ulong),
typeof(short), typeof(ushort), typeof(decimal),
typeof(byte), typeof(sbyte),
typeof(double), typeof(float)
};
if (m.MemberType == typeof(string))
{
generateCallToHelper("GetLiteralString");
}
else if (m.MemberType == typeof(bool))
{
generateCallToHelper("GetLiteralBool");
}
else if (m.MemberType == typeof(char))
{
generateCallToHelper("GetLiteralChar");
}
else if (numericTypes.Contains(m.MemberType))
{
// Get raw number string
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, typeof(Emit).GetMethod("GetLiteralNumber", new Type[] { typeof(IJsonReader) }));
// Convert to a string
il.Emit(OpCodes.Call, typeof(CultureInfo).GetProperty("InvariantCulture").GetGetMethod());
il.Emit(OpCodes.Call, m.MemberType.GetMethod("Parse", new Type[] { typeof(string), typeof(IFormatProvider) }));
//
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, typeof(IJsonReader).GetMethod("NextToken", new Type[] { }));
}
else
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldtoken, m.MemberType);
il.Emit(OpCodes.Call, typeof(Type).GetMethod("GetTypeFromHandle", new Type[] { typeof(RuntimeTypeHandle) }));
il.Emit(OpCodes.Callvirt, typeof(IJsonReader).GetMethod("Parse", new Type[] { typeof(Type) }));
il.Emit(m.MemberType.IsValueType ? OpCodes.Unbox_Any : OpCodes.Castclass, m.MemberType);
}
}
bool FindMemberInfo(string name, out JsonMemberInfo found)
{
for (int i = 0; i < Members.Count; i++)
{
int index = (i + _lastFoundIndex) % Members.Count;
var jmi = Members[index];
if (jmi.JsonKey == name)
{
_lastFoundIndex = index;
found = jmi;
return(true);
}
}
found = null;
return(false);
}
