/// <summary>
/// New sets of arcs are added after the last arc
/// </summary>
internal virtual void AddArc(Arc start, Arc end)
{
State state = null;
if (_startArc == null)
{
_startArc = start;
_endArc = end;
}
else
{
bool done = false;
// Successive <one-of> have 2 epsilon transition
if (_endArc.IsEpsilonTransition && start.IsEpsilonTransition)
{
// Trim the start tag.
start = TrimStart(start, _backend);
// If Trimming didn't create a non epsilon, try to trim the end
if (start.IsEpsilonTransition)
{
_endArc = TrimEnd(_endArc, _backend);
// start and end are still epsilon transition
if (_endArc.IsEpsilonTransition)
{
// we do the merging
State from = _endArc.Start;
State to = start.End;
done = true;
if (from == null)
{
// Ignore the current _start _end
Arc.CopyTags(_endArc, start, Direction.Right);
_startArc = start;
}
else if (to == null)
{
// Ignore the old _startArc _endArc
Arc.CopyTags(start, _endArc, Direction.Left);
end = _endArc;
}
else
{
// No tags, just fold the start and end state
if (_endArc.IsPropertylessTransition && start.IsPropertylessTransition)
{
// Move the end arc
start.End = null;
_endArc.Start = null;
_backend.MoveInputTransitionsAndDeleteState(from, to);
}
else
{
// Discard the endstate and replace it with the startArc
Arc.CopyTags(start, _endArc, Direction.Left);
start.End = null;
_endArc.End = to;
}
}
}
}
}
if (!done)
{
// If the last arc is an epsilon value then there is no need to create a new state
if (_endArc.IsEpsilonTransition && Graph.CanTagsBeMoved(_endArc, start))
{
// Copy the tags from "endArc" to the "start"
Arc.CopyTags(_endArc, start, Direction.Right);
if (_endArc.Start != null)
{
// Discard the endstate and replace it with the startArc
state = _endArc.Start;
_endArc.Start = null;
// Connexion between the state end the start is done below
//state.OutArcs.Add (start);
//start.Start = state;
}
if (_endArc == _startArc)
{
_startArc = start;
}
}
else
{
// If the first arc is an epsilon value then there is no need to create a new state
if (start.IsEpsilonTransition && Graph.CanTagsBeMoved(start, _endArc))
{
// Copy the tags from "endArc" to the "start"
Arc.CopyTags(start, _endArc, Direction.Left);
if (start.End != null)
{
// Discard the endstate and replace it with the startArc
state = start.End;
start.End = null;
_endArc.End = state;
state = null;
}
if (start == end)
{
end = _endArc;
}
}
else
{
// Create a new state
state = _backend.CreateNewState(_rule);
// Connect the new state with the end arc
_endArc.End = state;
}
}
// connect the arcs
if (state != null)
{
start.Start = state;
}
}
_endArc = end;
}
}
internal virtual void AddArc(Arc start, Arc end)
{
State state = null;
if (_startArc == null)
{
_startArc = start;
_endArc = end;
return;
}
bool flag = false;
if (_endArc.IsEpsilonTransition && start.IsEpsilonTransition)
{
start = TrimStart(start, _backend);
if (start.IsEpsilonTransition)
{
_endArc = TrimEnd(_endArc, _backend);
if (_endArc.IsEpsilonTransition)
{
State start2 = _endArc.Start;
State end2 = start.End;
flag = true;
if (start2 == null)
{
Arc.CopyTags(_endArc, start, Direction.Right);
_startArc = start;
}
else if (end2 == null)
{
Arc.CopyTags(start, _endArc, Direction.Left);
end = _endArc;
}
else if (_endArc.IsPropertylessTransition && start.IsPropertylessTransition)
{
start.End = null;
_endArc.Start = null;
_backend.MoveInputTransitionsAndDeleteState(start2, end2);
}
else
{
Arc.CopyTags(start, _endArc, Direction.Left);
start.End = null;
_endArc.End = end2;
}
}
}
}
if (!flag)
{
if (_endArc.IsEpsilonTransition && Graph.CanTagsBeMoved(_endArc, start))
{
Arc.CopyTags(_endArc, start, Direction.Right);
if (_endArc.Start != null)
{
state = _endArc.Start;
_endArc.Start = null;
}
if (_endArc == _startArc)
{
_startArc = start;
}
}
else if (start.IsEpsilonTransition && Graph.CanTagsBeMoved(start, _endArc))
{
Arc.CopyTags(start, _endArc, Direction.Left);
if (start.End != null)
{
state = start.End;
start.End = null;
_endArc.End = state;
state = null;
}
if (start == end)
{
end = _endArc;
}
}
else
{
state = _backend.CreateNewState(_rule);
_endArc.End = state;
}
if (state != null)
{
start.Start = state;
}
}
_endArc = end;
}