/// <summary>
/// Gets Move of a state.
/// </summary>
/// <param name="state">state for which to get Move</param>
/// <param name="chInputSymbol">Input symbol</param>
/// <returns>Set of Move</returns>
private Set Move(State state, string sInputSymbol)
{
Set set = new Set();
State[] arrTrans = state.GetTransitions(sInputSymbol);
if (arrTrans != null)
{
set.AddElementRange(arrTrans);
}
return(set);
}
/// <summary>
///
/// </summary>
/// <param name="stateStart">start state of the model</param>
/// <param name="setProcessed">when function returns, this set contains all the states</param>
/// <param name="setAllState">when function returns, this set contains all the input symbols</param>
public static void GetAllStateAndInput(State stateStart, HashSet <State> setAllState, HashSet <string> setInputSymbols)
{
if (stateStart == null)
{
throw new ArgumentNullException(nameof(stateStart));
}
if (setAllState == null)
{
throw new ArgumentNullException(nameof(setAllState));
}
if (setInputSymbols == null)
{
throw new ArgumentNullException(nameof(setInputSymbols));
}
HashSet <State> setUnprocessed = new HashSet <State>
{
stateStart
};
while (setUnprocessed.Count > 0)
{
State state = setUnprocessed.FirstOrDefault();
setAllState.Add(state);
setUnprocessed.Remove(state);
foreach (string sSymbol in state.AllKeys)
{
setInputSymbols.Add(sSymbol);
foreach (State stateEpsilon in state.GetTransitions(sSymbol))
{
if (!setAllState.Contains(stateEpsilon))
{
setUnprocessed.Add(stateEpsilon);
}
}
// end of inner foreach..loop
} // end of outer foreach..loop
} // end of outer while..loop
}
static internal int GetSerializedFsa(State stateStart, Set setAllState, Set setAllSymbols, StringBuilder sb)
{
int nLineLength = 0;
int nMinWidth = 6;
string sLine = String.Empty;
string sFormat = String.Empty;
setAllSymbols.RemoveElement(MetaSymbol.EPSILON);
setAllSymbols.AddElement(MetaSymbol.EPSILON); // adds it at the end;
// construct header row and format string
object[] arrObj = new object[setAllSymbols.Count + 1];// the extra one becuase of the first State column
arrObj[0] = "State";
sFormat = "{0,-8}";
for (int i = 0; i < setAllSymbols.Count; i++)
{
string sSymbol = setAllSymbols[i].ToString();
arrObj[i + 1] = sSymbol;
sFormat += " | ";
sFormat += "{" + (i + 1).ToString() + ",-" + Math.Max(Math.Max(sSymbol.Length, nMinWidth), sSymbol.ToString().Length) + "}";
}
sLine = String.Format(sFormat, arrObj);
nLineLength = Math.Max(nLineLength, sLine.Length);
sb.AppendLine(("").PadRight(nLineLength, '-'));
sb.AppendLine(sLine);
sb.AppendLine(("").PadRight(nLineLength, '-'));
// construct the rows for transtion
int nTransCount = 0;
foreach (object objState in setAllState)
{
State state = (State)objState;
arrObj[0] = (state.Equals(stateStart) ? ">" + state.ToString() : state.ToString());
for (int i = 0; i < setAllSymbols.Count; i++)
{
string sSymbol = setAllSymbols[i].ToString();
State[] arrStateTo = state.GetTransitions(sSymbol);
string sTo = String.Empty;
if (arrStateTo != null)
{
nTransCount += arrStateTo.Length;
sTo = arrStateTo[0].ToString();
for (int j = 1; j < arrStateTo.Length; j++)
{
sTo += ", " + arrStateTo[j].ToString();
}
}
else
{
sTo = "--";
}
arrObj[i + 1] = sTo;
}
sLine = String.Format(sFormat, arrObj);
sb.AppendLine(sLine);
nLineLength = Math.Max(nLineLength, sLine.Length);
}
sFormat = "State Count: {0}, Input Symbol Count: {1}, Transition Count: {2}";
sLine = String.Format(sFormat, setAllState.Count, setAllSymbols.Count, nTransCount);
nLineLength = Math.Max(nLineLength, sLine.Length);
sb.AppendLine(("").PadRight(nLineLength, '-'));
sb.AppendLine(sLine);
nLineLength = Math.Max(nLineLength, sLine.Length);
setAllSymbols.RemoveElement(MetaSymbol.EPSILON);
return(nLineLength);
}
/// <summary>
/// Partions set of all DFA states into smaller groups (according to the partion rules).
/// Please see notes for detail of partioning DFA.
/// </summary>
/// <param name="setMasterDfa">Set of all DFA states</param>
/// <param name="setInputSymbol">Set of all input symbol</param>
/// <returns>Array of DFA groups</returns>
private ArrayList PartitionDfaGroups(Set setMasterDfa, Set setInputSymbol)
{
ArrayList arrGroup = new ArrayList(); // array of all set (group) of DFA states.
Map map = new Map(); // to keep track of which memeber transition into which group
Set setEmpty = new Set();
// first we need to create two partition of the setMasterDfa:
// one with all the accepting states and the other one with all the non-accpeting states
Set setAccepting = new Set(); // group of all accepting state
Set setNonAccepting = new Set(); // group of all non-accepting state
foreach (object objState in setMasterDfa)
{
State state = (State)objState;
if (state.AcceptingState == true)
{
setAccepting.AddElement(state);
}
else
{
setNonAccepting.AddElement(state);
}
}
if (setNonAccepting.GetCardinality() > 0)
{
arrGroup.Add(setNonAccepting); // add this newly created partition to the master list
}
// for accepting state, there should always be at least one state, if NOT then there must be something wrong somewhere
arrGroup.Add(setAccepting); // add this newly created partition to the master list
//第一步 分成setAccepting与setNonAccepting 将所有的AcceptingState 加入setAccepting。
// now we iterate through these two partitions and see if they can be further partioned.
// we continuew the iteration until no further paritioning is possible.
IEnumerator iterInput = setInputSymbol.GetEnumerator();
iterInput.Reset();
while (iterInput.MoveNext())
{
string sInputSymbol = iterInput.Current.ToString();
int nPartionIndex = 0;
while (nPartionIndex < arrGroup.Count)
{
Set setToBePartitioned = (Set)arrGroup[nPartionIndex];
nPartionIndex++;
if (setToBePartitioned.IsEmpty() || setToBePartitioned.GetCardinality() == 1)
{
continue; // because we can't partition a set with zero or one memeber in it
}
foreach (object objState in setToBePartitioned)
{
State state = (State)objState;
State[] arrState = state.GetTransitions(sInputSymbol.ToString());
if (arrState != null)
{
Debug.Assert(arrState.Length == 1);
State stateTransionTo = arrState[0]; // since the state is DFA state, this array should contain only ONE state
Set setFound = FindGroup(arrGroup, stateTransionTo);
map.Add(setFound, state);
}
else // no transition exists, so transition to empty set
{
//setEmpty = new Set();
map.Add(setEmpty, state); // keep a map of which states transtion into which group
}
} // end of foreach (object objState in setToBePartitioned)
if (map.Count > 1) // means some states transition into different groups
{
arrGroup.Remove(setToBePartitioned);
foreach (DictionaryEntry de in map)
{
Set setValue = (Set)de.Value;
arrGroup.Add(setValue);
}
nPartionIndex = 0; // we want to start from the begining again
iterInput.Reset(); // we want to start from the begining again
}
map.Clear();
} // end of while..loop
} // end of foreach (object objString in setInputSymbol)
return(arrGroup);
} // end of PartitionDfaSet method