/// <returns>Null, if no match was found.</returns>
public Match MatchFirst(Signal output, Port port)
{
// 1. Trial: Try Local Subscriptions
if(_subscriptionAxis.Count > 0)
{
Match m = new Match(_subscriptionAxis[0], 1 + _condition.Score);
// Check Group Axis
string label;
if(_groupAxis.TryGetValue(m.PatternId, out label))
m.AppendGroup(label, new Tuple<Signal, Port>(output, port));
return m;
}
// 2. Trial: Follow Condition Axis
foreach(CoalescedTreeNode condition in _conditionAxis)
{
Match m = condition.MatchFirst(output, port);
if(m != null)
{
// Check Group Axis
string label;
if(_groupAxis.TryGetValue(m.PatternId, out label))
m.AppendGroup(label, new Tuple<Signal, Port>(output, port));
return m;
}
}
// 3. Trial: Follow Pattern Axis.
foreach(CoalescedChildPattern pattern in _patternAxis)
{
Match m = pattern.MatchFirst(port);
if(m != null)
{
// Check Group Axis
string label;
if(_groupAxis.TryGetValue(m.PatternId, out label))
m.AppendGroup(label, new Tuple<Signal, Port>(output, port));
return m;
}
}
// No match found
return null;
}
