private void PerformCombo(Func <bool> completion)
{
var positions = new List <List <Vector2Int> >();
foreach (var termButton in termButtons)
{
var isOperandButton = termButton is OperandButton;
if (!isOperandButton)
{
continue;
}
var y = termButton.GetPosition().y;
var formula = new Formula();
for (var x = termButton.GetPosition().x; x < grid.Count; ++x)
{
var t = grid[x][y];
if (!formula.CanAppendTermButton(t))
{
break;
}
formula.AppendTermButton(t);
if (!formula.IsCorrect)
{
continue;
}
var group = new List <Vector2Int>();
for (var x2 = termButton.GetPosition().x; x2 <= x; ++x2)
{
var position = new Vector2Int(x2, y);
group.Add(position);
}
var removedGroups = new List <List <Vector2Int> >();
var ok = true;
foreach (var g in positions)
{
foreach (var position in g)
{
if (group.Contains(position))
{
if (group.Count <= g.Count)
{
ok = false;
}
else
{
removedGroups.Add(g);
}
break;
}
}
if (!ok)
{
break;
}
}
if (ok)
{
foreach (var removedGroup in removedGroups)
{
positions.Remove(removedGroup);
}
positions.Add(group);
}
}
}
if (positions.Count == 0)
{
completion();
}
else
{
RemoveTermButtons(positions, completion, true);
}
}