public void TestAdvanceToEndSimpleRegex()
{
SimpleTestPathRegex regex = new SimpleTestPathRegex("A1B");
IBeforeItemGraphkenState <string, int, Func <string, bool>, Func <int, bool> > initState = regex.CreateState();
Func <Func <string, bool>, string, bool> itemMatch = (f, i) => f(i);
Func <Func <int, bool>, int, bool> dependencyMatch = (f, d) => f(d);
bool atEnd, atCount;
IBeforeDependencyGraphkenState <string, int, Func <string, bool>, Func <int, bool> > stateAfterA =
initState.Advance("A", itemMatch, out atEnd, out atCount);
Assert.IsTrue(stateAfterA.CanContinue);
Assert.IsFalse(atEnd);
IBeforeItemGraphkenState <string, int, Func <string, bool>, Func <int, bool> > stateAfter1 =
stateAfterA.Advance(1, dependencyMatch, out atCount);
Assert.IsTrue(stateAfter1.CanContinue);
IBeforeDependencyGraphkenState <string, int, Func <string, bool>, Func <int, bool> > stateAfterB =
stateAfter1.Advance("B", itemMatch, out atEnd, out atCount);
Assert.IsTrue(stateAfterB.CanContinue);
Assert.IsTrue(atEnd);
}
private TUpInfo Traverse([NotNull] TItem tail, [NotNull] Dictionary <TItem, TDependency[]> incidentDependencies,
IBeforeDependencyGraphkenState <TItem, TDependency, ItemMatch, DependencyMatch> beforeDependencyState,
TDownInfo rawDown, HashSet <TPathState> statesOnPath)
{
if (!beforeDependencyState.CanContinue)
{
throw new ArgumentException("Traverse must be called with continueable state", nameof(beforeDependencyState));
}
_checkAbort();
TUpInfo upSum;
bool visitSuccessors = ShouldVisitSuccessors(tail, _currentPath, out upSum);
if (visitSuccessors)
{
// We are at this item for the first time - check whether we find a path to some defined end
TDependency[] dependencies;
if (!incidentDependencies.TryGetValue(tail, out dependencies))
{
dependencies = NO_DEPENDENCIES;
}
foreach (var nextDep in dependencies)
{
bool dependencyIsCounted;
IBeforeItemGraphkenState <TItem, TDependency, ItemMatch, DependencyMatch> beforeItemState =
beforeDependencyState.Advance(nextDep, (m, d) => m.IsMatch(d), out dependencyIsCounted);
if (beforeItemState.CanContinue)
{
TItem nextTail = nextDep.UsedItem;
bool atEnd;
bool itemIsCounted;
IBeforeDependencyGraphkenState <TItem, TDependency, ItemMatch, DependencyMatch> beforeNextDependencyState =
beforeItemState.Advance(nextTail, (m, i) => ItemMatch.IsMatch(m, i), out atEnd, out itemIsCounted);
_currentPath.Push(nextDep);
CountedEnum counted =
dependencyIsCounted ? CountedEnum.DependencyCounted :
itemIsCounted ? CountedEnum.UsedItemCounted :
CountedEnum.NotCounted;
var stateElement = CreateStateElement(beforeNextDependencyState, nextDep);
bool newOnPath = statesOnPath.Add(stateElement);
DownAndHere downAndHere = AfterPushDependency(_currentPath, atEnd, !newOnPath, counted, rawDown);
TUpInfo childUp;
if (_currentPath.Count < _maxRecursionDepth &&
beforeNextDependencyState.CanContinue &&
newOnPath)
{
childUp = Traverse(nextTail, incidentDependencies, beforeNextDependencyState,
downAndHere.Down, statesOnPath);
statesOnPath.Remove(stateElement);
}
else
{
childUp = default(TUpInfo); // ??? as above ____
}
upSum = BeforePopDependency(_currentPath, atEnd, !newOnPath, counted, rawDown, downAndHere.Save, upSum, childUp);
_currentPath.Pop();
}
}
}
upSum = AfterVisitingSuccessors(visitSuccessors, tail, _currentPath, upSum);
return(upSum);
}