/// <summary>
/// Add a row to the table and figure out which states are equivalent. Here is a basic rundown of the algorithm: for every vertex of
/// the set in your rowNames entry for that row, union all the states that can be reached by the transition designated by that column
/// of the table (from any vertex from the rowNames entry). This union of states is what you store in the table.
/// </summary>
/// <param name="set">VertexSet that you must check the transitions of</param>
public void addRow(VertexSet set)
{
//declared temporary variables v,e and s to hold individual BaseVertexes, Edges and strings from the foreach loops below
BaseVertex v;
Edge e;
string s;
//the union of the necessary BaseVertexes to store in the table
VertexSet tablePayload;
for(int i=0; i < columnNames.Count; i++){ // for every transition
s = (string)columnNames[i];
tablePayload = new VertexSet();
for(int j=0; j < set.size(); j++){ // for every vertex in the set (the set is the corresponding rowNames entry passed in from the caller)
v = (BaseVertex)set.vertices[j];
for(int k=0; k < v.Connections.Count; k++){ // for every edge in that vertex
e = v.Connections[k];
if (e.Condition == s && !tablePayload.isInSet(e.Connection)) { // check if the edge transition is the same as the column you're in and also if it's not already in the tablepayload
tablePayload.addToSet(e.Connection);
}
}
}
table[i].Add(eClosure(tablePayload)); // put that payload into the table
}
}
/// <summary>
/// perform an epsilon closure on a vertex
/// </summary>
/// <param name="v">vertex to perform e closure on</param>
/// <returns>list of vertices in the epsilon closure of the vertex passed into the method</returns>
public VertexSet eClosure(BaseVertex v)
{
Stack<BaseVertex> nodes = new Stack<BaseVertex>();
BaseVertex current;
VertexSet visited = new VertexSet(new ArrayList());
// if the node passed doesn't have e transitions, return list with just passed in vertex, otherwise push onto stack and start algorithm
if (this.hasEpsilonTransition(v))
{
nodes.Push(v);
}
while (nodes.Count > 0)
{
current = nodes.Pop();
visited.addToSet(current);
if (this.hasEpsilonTransition(current))
{
ArrayList eNodes = this.getEpsilonTransition(current);
foreach (BaseVertex newNode in eNodes)
{
if (!visited.isInSet(newNode))
{
nodes.Push(newNode);
}
}
}
}
if (visited.size() == 0)
{
visited.addToSet(v);
}
return visited;
}