private static Expression CreateObject(Type type, ParameterExpression factParameter, ParameterExpression emitterParameter)
{
var constructorInfos = type.GetConstructors();
if (constructorInfos.Length != 1)
{
throw new NotImplementedException($"More than one constructor for {type.Name}");
}
var constructor = constructorInfos.Single();
var parameters = constructor.GetParameters();
var parameterExpressions = parameters
.Select(parameter =>
Interrogate.IsField(parameter.ParameterType)
? GetFieldValue(parameter.Name, parameter.ParameterType, factParameter) :
Interrogate.IsFactType(parameter.ParameterType)
? GetPredecessor(parameter.Name, parameter.ParameterType, factParameter, emitterParameter) :
Interrogate.IsArrayOfFactType(parameter.ParameterType)
? GetPredecessorArray(parameter.Name, parameter.ParameterType.GetElementType(), factParameter, emitterParameter) :
throw new NotImplementedException()
)
.ToArray();
return(Expression.New(
constructor,
parameterExpressions
));
}
private static Expression PredecessorList(Type type, ParameterExpression instanceParameter, ParameterExpression collectorParameter)
{
var properties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
Expression emptyList = Expression.Field(
null,
typeof(ImmutableList <Predecessor>),
nameof(ImmutableList <Predecessor> .Empty)
);
var addMethod = typeof(ImmutableList <Predecessor>).GetMethod(nameof(ImmutableList <Predecessor> .Add));
var predecessorList = properties
.Where(property => Interrogate.IsPredecessor(property.PropertyType))
.Select(property => Interrogate.IsFactType(property.PropertyType)
? PredecessorSingleGetter(property, instanceParameter, collectorParameter)
: PredecessorMultipleGetter(property, instanceParameter, collectorParameter))
.Aggregate(emptyList, (list, predecessor) => Expression.Call(list, addMethod, predecessor));
return(predecessorList);
}