private bool EvaluateValidPull(
SolverState state,
ISolverPool myPool,
ISolverPool solutionPool,
SolverNode node,
VectorInt2 pc,
VectorInt2 p,
VectorInt2 pp,
List <SolverNode> toEnqueue,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPull(node, node.CrateMap, state.StaticMaps.WallMap, pc, p, pp);
// Cycle Check: Does this node exist already?
var dup = myPool.FindMatch(newKid);
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
newKid.Duplicate = dup;
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
var match = solutionPool?.FindMatch(newKid);
if (match != null)
{
// Add to tree / itterator
node.Add(newKid);
// Solution
state.SolutionsNodesReverse ??= new List <SolutionChain>();
var pair = new SolutionChain
{
ForwardNode = match,
ReverseNode = newKid,
FoundUsing = this
};
state.SolutionsNodesReverse.Add(pair);
solution = true;
state.Command.Debug.Raise(this, SolverDebug.Solution, pair);
foreach (var n in newKid.PathToRoot().Union(match.PathToRoot()))
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
match.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
// Add to tree / iterator
node.Add(newKid); // Thread-safe: As all kids get created in this method (forward / reverse)
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionReverse(state.StaticMaps))
{
// Possible Solution: Did we start in a valid position
if (CheckValidSolutions(state, newKid))
{
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
solution = true;
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
}
else
{
// We started in the wrong place; ignore and continue
}
}
}
}
}
return(false);
}
private bool EvaluateValidPush(
SolverState state,
ISolverPool pool,
ISolverPool reversePool,
SolverNode node,
VectorInt2 pp,
VectorInt2 ppp,
VectorInt2 p,
VectorInt2 push,
List <SolverNode> toEnqueue,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPush(node, node.CrateMap, state.StaticMaps.WallMap, p, pp, ppp, push);
// Cycle Check: Does this node exist already?
var dup = pool.FindMatch(newKid);
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
newKid.Duplicate = dup;
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
node.Add(newKid);
// If there is a reverse solver, checks its pool for a match, hence a Forward <-> Reverse chain, hence a solution
var match = reversePool?.FindMatch(newKid);
if (match != null)
{
// Solution!
NewSolutionChain(state, out solution, newKid, match);
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
state.Statistics.TotalDead++;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionForward(state.StaticMaps))
{
// Solution
solution = true;
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
}
}
}
return(false);
}
private bool EvaluateValidPull(
SolverState state,
ISolverPool pool,
ISolverPool solutionPool,
SolverNode node,
VectorInt2 pc,
VectorInt2 p,
VectorInt2 pp,
List <SolverNode> toEnqueue,
List <SolverNode> toPool,
ref bool solution)
{
state.Statistics.TotalNodes++;
var newKid = nodeFactory.CreateFromPull(node, node.CrateMap, state.StaticMaps.WallMap, pc, p, pp);
if (state.Command.Inspector != null && state.Command.Inspector(newKid))
{
state.Command.Report?.WriteLine(newKid.ToString());
}
// Cycle Check: Does this node exist already?
var dup = pool.FindMatch(newKid);
if (SafeMode && dup == null)
{
dup = ConfirmDupLookup(pool, node, toEnqueue, newKid); // Fix or Throw
}
if (dup != null)
{
if (object.ReferenceEquals(dup, newKid))
{
throw new InvalidDataException();
}
if (dup.SolverNodeId == newKid.SolverNodeId)
{
throw new InvalidDataException();
}
// Duplicate
newKid.Status = SolverNodeStatus.Duplicate;
state.Statistics.Duplicates++;
if (state.Command.DuplicateMode == DuplicateMode.AddAsChild)
{
node.Add(newKid);
if (newKid is ISolverNodeDuplicateLink dupLink)
{
dupLink.Duplicate = dup;
}
}
else if (state.Command.DuplicateMode == DuplicateMode.ReuseInPool)
{
nodeFactory.ReturnInstance(newKid); // Add to pool for later re-use?
}
else // DuplicateMode.Discard
{
}
}
else
{
// These two should always be the same
node.Add(newKid); toPool.Add(newKid);
// If there is a reverse solver, checks its pool for a match, hence a Forward <-> Reverse chain, hence a solution
var match = solutionPool?.FindMatch(newKid);
if (match != null)
{
// Solution
state.SolutionsNodesReverse ??= new List <SolutionChain>();
var pair = new SolutionChain
{
ForwardNode = match,
ReverseNode = newKid,
FoundUsing = this
};
state.SolutionsNodesReverse.Add(pair);
solution = true;
state.Command.Debug.Raise(this, SolverDebug.Solution, pair);
foreach (var n in newKid.PathToRoot().Union(match.PathToRoot()))
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
match.Status = SolverNodeStatus.Solution;
if (state.Command.ExitConditions.StopOnSolution)
{
return(true);
}
}
else
{
if (DeadMapAnalysis.DynamicCheck(state.StaticMaps, node))
{
newKid.Status = SolverNodeStatus.Dead;
}
else
{
toEnqueue.Add(newKid);
if (newKid.IsSolutionReverse(state.StaticMaps))
{
// Possible Solution: Did we start in a valid position
if (CheckValidSolutions(state, newKid))
{
state.SolutionsNodes.Add(newKid);
state.Command.Debug.Raise(this, SolverDebug.Solution, newKid);
solution = true;
foreach (var n in newKid.PathToRoot())
{
n.Status = SolverNodeStatus.SolutionPath;
}
newKid.Status = SolverNodeStatus.Solution;
}
else
{
// We started in the wrong place; ignore and continue
}
}
}
}
}
return(false);
}