public Persist(IEnumerable <Expression> initialValue, NewValueFunction newValue)
{
State = initialValue.Select((v, i) => new State(i, 0, v)).ToList().AsReadOnly();
NewValue = new ReadOnlyCollection <Expression>(newValue(State).ToArray());
if (NewValue.Any(e => e == null))
{
throw new ArgumentException("An operand was null");
}
if (State.Count != NewValue.Count)
{
throw new ArgumentException("Collection counts were different");
}
// Increment the scope number if there's nested loops
var scope = NewValue.SelectMany(n => n.AllDependent).OfType <State>().OrderBy(s => s.Scope).FirstOrDefault();
if (scope != null)
{
State = initialValue.Select((v, i) => new State(i, scope.Id + 1, v)).ToList().AsReadOnly();
NewValue = new ReadOnlyCollection <Expression>(newValue(State).ToArray());
}
}
public Loop(IEnumerable <Expression> initialValue, ConditionFunction condition, NewValueFunction body)
{
if (condition == null)
{
throw new ArgumentNullException(nameof(condition));
}
State = initialValue.Select((v, i) => new State(i, 0, v)).ToList().AsReadOnly();
Body = new ReadOnlyCollection <Expression>(body(State).ToArray());
Condition = condition(State);
if (Body.Any(e => e == null))
{
throw new ArgumentException("An operand was null");
}
if (State.Count != Body.Count)
{
throw new ArgumentException("Collection counts were different");
}
// Increment the scope number if there's nested loops
var scope = Body.SelectMany(n => n.AllDependent)
.Concat(Condition.AllDependent)
.OfType <State>()
.OrderBy(s => s.Scope)
.FirstOrDefault();
if (scope != null)
{
State = initialValue.Select((v, i) => new State(i, scope.Id + 1, v)).ToList().AsReadOnly();
Body = new ReadOnlyCollection <Expression>(body(State).ToArray());
Condition = condition(State);
}
}
