public ConstructorInfo CreateEnumeratorType(Type propertyType, IReadOnlyList <FieldBuilder> fieldStates, IReadOnlyDictionary <string, ModelPropertyTypeGenerator.Field> fields)
{
var typeBuilder = _moduleBuilder.DefineUniqueType("ModelPropertiesEnumerator");
var groupedFields = fieldStates.Select(fs => (FieldState: fs, Fields: (IReadOnlyList <ModelPropertyTypeGenerator.Field>)fields.Values.Where(f => f.State.Field == fs).OrderBy(f => f.State.Offset).ToList())).ToList();
var enumeratorFields = new EnumeratorFields(typeBuilder, propertyType, fieldStates);
var constructor = ImplementConstructor(typeBuilder, propertyType, enumeratorFields, fieldStates);
typeBuilder.AddInterfaceImplementation(typeof(IEnumerator <KeyValuePair <string, object> >));
ImplementEnumerator(typeBuilder, enumeratorFields, groupedFields);
ImplementDisposable(typeBuilder);
typeBuilder.CreateTypeInfo();
return(constructor);
}
private static void ImplementEnumerator(TypeBuilder typeBuilder, EnumeratorFields enumeratorFields, IReadOnlyList <(FieldBuilder FieldState, IReadOnlyList <ModelPropertyTypeGenerator.Field> Fields)> fields)
private static ConstructorInfo ImplementConstructor(TypeBuilder typeBuilder, Type propertyType, EnumeratorFields enumeratorFields, IReadOnlyList <FieldBuilder> fieldStates)
{
var types = new Type[1 + fieldStates.Count];
types[0] = propertyType;
for (var index = 0; index < fieldStates.Count; index++)
{
types[1 + index] = typeof(BitVector32);
}
var constructorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard, types);
constructorBuilder.DefineParameter(1, ParameterAttributes.None, "properties");
for (var index = 0; index < fieldStates.Count; index++)
{
constructorBuilder.DefineParameter(2 + index, ParameterAttributes.None, $"fieldState{index}");
}
var il = constructorBuilder.GetILGenerator();
// this._properties = properties;
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Stfld, enumeratorFields.Properties);
for (var index = 0; index < fieldStates.Count; index++)
{
var fieldState = fieldStates[index];
// this._fieldState{i} = fieldState{i};
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldarg, 2 + index);
il.Emit(OpCodes.Stfld, enumeratorFields.FieldStatesMap[fieldState]);
}
il.Emit(OpCodes.Ret);
return(constructorBuilder);
}