private void FindGraphCycles(out List <Stack <ParsedCell> > cycles)
{
cycles = new List <Stack <ParsedCell> >();
var unvisited = new HashSet <ParsedCell>(cellGraph.Keys);
while (unvisited.Count > 0)
{
ParsedCell curNode = null;
foreach (var node in unvisited)
{
curNode = node; break;
}
var path = new Stack <ParsedCell>();
if (HasCycleWithNode(path, new HashSet <ParsedCell>(), curNode, curNode))
{
cycles.Add(path);
foreach (var node in path)
{
unvisited.Remove(node);
}
}
else
{
unvisited.Remove(curNode);
}
}
}
private void RemoveParentFromChildren(ParsedCell parent)
{
if (!cellGraph.ContainsKey(parent))
{
return;
}
var children = cellGraph[parent].children;
foreach (var child in children)
{
if (!cellGraph.ContainsKey(child))
{
continue;
}
var childNode = cellGraph[child];
if (!childNode.parents.Contains(parent))
{
continue;
}
childNode.parents.Remove(parent);
if (childNode.parents.Count == 0 && childNode.children.Count == 0)
{
cellGraph.Remove(child);
}
}
}
private void ListenToChildsErrors(ParsedCell listener)
{
Debug.Assert(cellGraph.ContainsKey(listener));
SubscribeToChildError(new HashSet <ParsedCell>()
{
listener
}, cellGraph[listener].children, listener);
}
private void AddParentToChildren(ParsedCell parent, HashSet <ParsedCell> children)
{
foreach (var child in children)
{
if (!cellGraph.ContainsKey(child))
{
cellGraph.Add(child, (new HashSet <ParsedCell>(), new HashSet <ParsedCell>()));
}
cellGraph[child].parents.Add(parent);
}
}
private void SpreadErrorFromCell(ParsedCell cell, GridCoordinates cords)
{
if (!spreadErrorListeners.ContainsKey(cords))
{
spreadErrorListeners.Add(cords, new HashSet <ParsedCell>());
}
SpreadToParents(new HashSet <ParsedCell> {
cell
}, cellGraph[cell].parents, cords);
}
private void CalculateGrid()
{
var childDictionary = new Dictionary <GridCoordinates, object>();
var unvisited = new HashSet <ParsedCell>(cellGraph.Keys.Where((cell) => cell.Calculable));
while (unvisited.Count > 0)
{
ParsedCell targetCell = null;
foreach (var cell in unvisited)
{
targetCell = cell; break;
}
TryCalculateCell(unvisited, childDictionary, targetCell);
}
}
private string GenerateCycleErrorMessage(Stack <ParsedCell> path, ParsedCell initCell)
{
var sb = new StringBuilder();
sb.Append("Recursive dependency: \n");
var pathList = new List <ParsedCell>(path);
var shift = pathList.IndexOf(initCell);
Debug.Assert(shift >= 0);
for (int i = 0; i < pathList.Count; i++)
{
var cell = pathList[(shift + pathList.Count - i) % pathList.Count];
(string x, string y) = cell.Coordinates.GetStringCoords();
sb.Append($"{x}{y} ");
}
return(sb.ToString());
}
private void UpdateGraphForCell(ParsedCell targetCell)
{
if (!cellGraph.ContainsKey(targetCell))
{
cellGraph.Add(targetCell, (new HashSet <ParsedCell>(), new HashSet <ParsedCell>()));
}
else
{
RemoveParentFromChildren(targetCell);
cellGraph[targetCell].children.Clear();
}
cellGraph[targetCell].children.UnionWith(ExtractCellsFromCoords(targetCell.ChildCells));
AddParentToChildren(targetCell, cellGraph[targetCell].children);
if (cellGraph[targetCell].children.Count == 0 && cellGraph[targetCell].parents.Count == 0)
{
cellGraph.Remove(targetCell);
}
}
private bool HasCycleWithNode(Stack <ParsedCell> path, HashSet <ParsedCell> visited, ParsedCell currCell, ParsedCell initCell)
{
if (visited.Contains(currCell))
{
return(false);
}
visited.Add(currCell);
path.Push(currCell);
foreach (var child in cellGraph[currCell].children)
{
if (child == initCell)
{
return(true);
}
if (visited.Contains(child))
{
continue;
}
if (HasCycleWithNode(path, visited, child, initCell))
{
return(true);
}
}
path.Pop();
return(false);
}
private void SubscribeToChildError(HashSet <ParsedCell> visited, HashSet <ParsedCell> children, ParsedCell initListener)
{
foreach (var child in children)
{
if (visited.Contains(child))
{
continue;
}
visited.Add(child);
if (child.HasError)
{
var childCords = child.Coordinates;
if (!spreadErrorListeners.ContainsKey(childCords))
{
spreadErrorListeners.Add(childCords, new HashSet <ParsedCell>());
}
initListener.AddSpreadErrorSource(childCords);
spreadErrorListeners[childCords].Add(initListener);
}
else
{
Debug.Assert(cellGraph.ContainsKey(child));
SubscribeToChildError(visited, cellGraph[child].children, initListener);
}
}
}
private bool TryCalculateCell(HashSet <ParsedCell> unvisited, Dictionary <GridCoordinates, object> calculated, ParsedCell curCell)
{
unvisited.Remove(curCell);
bool success = true;
foreach (GridCoordinates childCoords in curCell.ChildCells)
{
if (calculated.ContainsKey(childCoords))
{
continue;
}
var childCell = FromCoords(childCoords);
if (childCell == null)
{
calculated.Add(childCoords, (Decimal)0);
}
if (unvisited.Contains(childCell))
{
success &= TryCalculateCell(unvisited, calculated, childCell);
}
}
if (success)
{
var result = curCell.Calculate(calculated);
calculated.Add(curCell.Coordinates, curCell.Value);
return(result);
}
return(false);
}
