public MainViewModel(IFileService fileService,
IGraphVizService graphVizService,
IDfaService dfaService,
ILanguageCheckService languageCheckService,
IRegularExpressionParserService regularExpressionParserService)
{
_fileService = fileService;
_graphVizService = graphVizService;
_dfaService = dfaService;
_languageCheckService = languageCheckService;
_regularExpressionParserService = regularExpressionParserService;
_words = new ObservableCollection <string>();
_file = new GraphVizFileModel();
OpenFileCommand = new RelayCommand(OpenFile, () => true);
ParseFileCommand = new RelayCommand(ParseFile, ParseFileCanExecute);
ShowAutomatonCommand = new RelayCommand(ShowAutomaton, ShowAutomatonCanExecute);
VerifyStringCommmand = new RelayCommand(VerifyString, VerifyStringCanExecute);
ParseRegularExpressionCommand = new RelayCommand(ParseRegularExpression, ParseRegularExpressionCanExecute);
CopyRELinesCommand = new RelayCommand(CopyRELines, () => true);
ShowAllWordsCommand = new RelayCommand(ShowAllWords, ShowAutomatonCanExecute);
ConvertToDfaCommand = new RelayCommand(ConvertToDfa, ConvertToDfaCanExecute);
CopyConvertLinesCommand = new RelayCommand(CopyConvertLines, () => true);
RegularExpressionInput = "|(a,*b)";
//|(.(a,*(b)),*(c))
//|(*(a),.(b,c))
//"*(|(*(.(a,b)),c))"
//|(a,*b)
}
public GraphVizFileModel ConvertAutomatonToGenericFile(AutomatonModel automaton)
{
var graphVizFile = new GraphVizFileModel();
//ALPHABET
string alphabetLine = "";
foreach (var letter in automaton.Alphabet)
{
alphabetLine += letter;
}
graphVizFile.Lines.Add(alphabet + " " + alphabetLine);
//STATES
string statesLine = "";
for (int index = 0; index < automaton.States.Count; index++)
{
var automatonState = automaton.States[index];
if (index == automaton.States.Count - 1)
{
statesLine += automatonState.Name;
}
else
{
statesLine += automatonState.Name + ",";
}
}
graphVizFile.Lines.Add(states + " " + statesLine);
//FINAL
var finalStates = automaton.States.Where(x => x.IsFinal);
var finalLine = "";
foreach (var finalState in finalStates)
{
finalLine += finalState.Name;
}
graphVizFile.Lines.Add(final + " " + finalLine);
//TRANSITIONS
graphVizFile.Lines.Add("transitions:");
foreach (var automatonTransition in automaton.Transitions)
{
var transitionLine =
$"{automatonTransition.BeginState.Name},{automatonTransition.Value} --> {automatonTransition.EndState.Name}";
graphVizFile.Lines.Add(transitionLine);
}
//END.
graphVizFile.Lines.Add("end.");
return(graphVizFile);
}
private Dictionary <string, bool> ReadWords(GraphVizFileModel graphVizFileModel, int lower, int upper)
{
var words = new Dictionary <string, bool>();
for (int i = lower; i < upper; i++)
{
var line = graphVizFileModel.Lines[i];
var chars = SplitOnComma(line);
var isAccepted = chars[1] == "y";
words.Add(chars[0], isAccepted);
}
return(words);
}
public GraphVizFileModel ConvertExpressionModelToGraphVizFile(ExpressionModel expressionModel)
{
var file = new GraphVizFileModel();
file.Lines.Add("graph logic {");
file.Lines.Add("node[fontname = \"Arial\"]");
var currentNode = expressionModel.TreeNodes.FirstOrDefault();
RecursivelyAddLines(file, currentNode);
file.Lines.Add("}");
return(file);
}
private void RecursivelyAddLines(GraphVizFileModel file, NodeModel currentNode)
{
//Add node to graph
file.Lines.Add($"node{currentNode.Id} [ label = \"{currentNode.Value}\" ]");
//Add connection to childs
if (currentNode.LeftChild != null)
{
file.Lines.Add($"node{currentNode.Id} -- node{currentNode.LeftChild.Id}");
RecursivelyAddLines(file, currentNode.LeftChild);
}
if (currentNode.RightChild != null)
{
file.Lines.Add($"node{currentNode.Id} -- node{currentNode.RightChild.Id}");
RecursivelyAddLines(file, currentNode.RightChild);
}
}
private List <TransitionModel> ReadRegularAutomatonTransitions(GraphVizFileModel graphVizFileModel, int lower, int upper, AutomatonModel automaton)
{
var transitions = new List <TransitionModel>();
for (int i = lower; i < upper; i++)
{
var transition = new TransitionModel();
var transitionString = graphVizFileModel.Lines[i];
var beginStateString = transitionString.Substring(0, transitionString.IndexOf(',')).Trim();
var valueString =
transitionString.Substring(transitionString.IndexOf(',') + 1, transitionString.IndexOf('-') - 2)
.Trim();
var endStateString = transitionString.Substring(transitionString.IndexOf('>') + 1).Trim();
foreach (var state in automaton.States)
{
if (state.Name.Equals(beginStateString) && i == lower)
{
transition.BeginState = state;
state.IsInitial = true;
}
else if (state.Name.Equals(beginStateString))
{
transition.BeginState = state;
}
if (state.Name.Equals(endStateString))
{
transition.EndState = state;
}
if (transition.BeginState != null && transition.EndState != null)
{
break;
}
}
valueString = valueString.ToLower();
if (valueString.Equals("_"))
{
valueString = "ε";
}
transition.Value = valueString;
transitions.Add(transition);
}
return(transitions);
}
public GraphVizFileModel ConvertToGraphVizFile(AutomatonModel automaton)
{
var file = new GraphVizFileModel();
file.Lines.Add("digraph myAutomaton {");
file.Lines.Add("rankdir=LR;");
file.Lines.Add("\"\"[shape = none]");
//Add initials
foreach (var automatonState in automaton.States)
{
if (automatonState.IsFinal && automatonState.IsInitial)
{
file.Lines.Add($"\"{automatonState.Name}\" [shape=doublecircle]");
file.Lines.Add($"\"\" -> \"{automatonState.Name}\"");
}
else if (automatonState.IsFinal)
{
file.Lines.Add($"\"{automatonState.Name}\" [shape=doublecircle]");
}
else if (automatonState.IsInitial)
{
file.Lines.Add($"\"{automatonState.Name}\" [shape=circle]");
file.Lines.Add($"\"\" -> \"{automatonState.Name}\"");
}
else
{
file.Lines.Add($"\"{automatonState.Name}\" [shape=circle]");
}
}
//add transitions
foreach (var transition in automaton.Transitions)
{
file.Lines.Add($"\"{transition.BeginState.Name}\" -> \"{transition.EndState.Name}\" [label=\"{transition.Value}\"]");
}
file.Lines.Add("}");
return(file);
}
public GraphVizFileModel ReadFile()
{
GraphVizFileModel fileModel = new GraphVizFileModel();
// Create OpenFileDialog
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
// Set filter for fileModel extension and default fileModel extension
dlg.DefaultExt = ".txt";
dlg.Filter = "Text documents (.txt)|*.txt";
// Display OpenFileDialog by calling ShowDialog method
var result = dlg.ShowDialog();
// Get the selected fileModel name and display in a TextBox
if (result == true)
{
// Open document
string filename = dlg.FileName;
fileModel.FilePath = filename;
fileModel.Lines = System.IO.File.ReadLines(filename).ToList();
}
return(fileModel);
}
private void ParsePrefix()
{
//Conversion to Infix and Distinct variables of expression
Infix = _fixConversionService.ParsePrefix(_expressionModel);
_fixConversionService.GetDistinctVariables(_expressionModel);
//Display Graph: create GraphVizFileModel, write to dot-file, create and open png-file of graph
_graphVizFileModel = _graphVizService.ConvertExpressionModelToGraphVizFile(_expressionModel);
_fileService.WriteGraphVizFileToDotFile(_graphVizFileModel.Lines, "infix");
_graphVizService.DisplayGraph("infix");
//Create string for expressionModel.Binary with distinct values
string distinctVariables = null;
foreach (var c in _expressionModel.DistinctVariables)
{
distinctVariables += c + " ";
}
DistinctVariables = distinctVariables;
//Build truth table
TruthTable = new ObservableCollection <string>(_truthTableService.GetTruthTable(_expressionModel));
Hash = _truthTableService.CalculateHash(_expressionModel);
//Simplification of truth table
SimplifiedTruthTable =
new ObservableCollection <string>(_truthTableService.SimplifyTruthTable(_expressionModel));
//Disjuntive normal form of input
DisjunctiveNormalForm = _truthTableService.GetDisjunctiveNormalForm(_expressionModel);
_expressionModelDisjunctiveNormalForm.Prefix = DisjunctiveNormalForm;
_expressionModelDisjunctiveNormalForm.DistinctVariables = _expressionModel.DistinctVariables;
//Calculate truth table and parse infix of DNF
_fixConversionService.ParsePrefix(_expressionModelDisjunctiveNormalForm);
_truthTableService.GetTruthTable(_expressionModelDisjunctiveNormalForm);
//Get hash of DNF
HashDisjunctiveNormalForm = _truthTableService.CalculateHash(_expressionModelDisjunctiveNormalForm);
_graphVizFileModel =
_graphVizService.ConvertExpressionModelToGraphVizFile(_expressionModelDisjunctiveNormalForm);
_fileService.WriteGraphVizFileToDotFile(_graphVizFileModel.Lines, "dnf");
_graphVizService.DisplayGraph("dnf");
//Simplified Disjunctive normal form of input
SimplifiedDisjunctiveNormalForm = _truthTableService.GetSimplifiedDisjunctiveNormalForm(_expressionModel);
_expressionModelSimplifiedDisjunctiveNormalForm.Prefix = SimplifiedDisjunctiveNormalForm;
_expressionModelSimplifiedDisjunctiveNormalForm.DistinctVariables = _expressionModel.DistinctVariables;
_expressionModelSimplifiedDisjunctiveNormalForm.TruthTable.Rows =
_expressionModel.TruthTable.Rows;
_expressionModelSimplifiedDisjunctiveNormalForm.TruthTable.RowsSimplified =
_expressionModel.TruthTable.RowsSimplified;
//Calculate truth table and parse infix of Simpl. DNF
_fixConversionService.ParsePrefix(_expressionModelSimplifiedDisjunctiveNormalForm);
_truthTableService.RevertTruthTableSimplification(_expressionModelSimplifiedDisjunctiveNormalForm, _expressionModel.TruthTable.Binary);
//Get hash of Simpl. DNF
HashDisjunctiveNormalFormSimplified = _truthTableService.CalculateHash(_expressionModelSimplifiedDisjunctiveNormalForm);
_graphVizFileModel = _graphVizService.ConvertExpressionModelToGraphVizFile(_expressionModelSimplifiedDisjunctiveNormalForm);
_fileService.WriteGraphVizFileToDotFile(_graphVizFileModel.Lines, "sdnf");
_graphVizService.DisplayGraph("sdnf");
//Nand
Nand = _fixConversionService.GetNandForm(_expressionModel);
_expressionModelNand.Prefix = Nand;
_expressionModelNand.DistinctVariables = _expressionModel.DistinctVariables;
//Calculate truth table and parse infix of Nand
_fixConversionService.ParsePrefix(_expressionModelNand);
_truthTableService.GetTruthTable(_expressionModelNand);
//Get has of Nand
HashNand = _truthTableService.CalculateHash(_expressionModelNand);
_graphVizFileModel = _graphVizService.ConvertExpressionModelToGraphVizFile(_expressionModelNand);
_fileService.WriteGraphVizFileToDotFile(_graphVizFileModel.Lines, "nand");
_graphVizService.DisplayGraph("nand");
}
public AutomatonModel ParseGraphVizFile(GraphVizFileModel graphVizFileModel)
{
string states = "states:";
string final = "final:";
string alphabet = "alphabet:";
string stack = "stack:";
var automaton = new AutomatonModel();
foreach (var line in graphVizFileModel.Lines)
{
if (line.Contains(alphabet))
{
var chars = GetSubstring(line, alphabet);
foreach (var c in chars)
{
automaton.Alphabet.Add(char.ToLower(c));
}
}
else if (line.Contains(stack))
{
var chars = GetSubstring(line, stack);
foreach (var c in chars)
{
automaton.AccecptedStack.Add(char.ToLower(c).ToString());
}
automaton.IsPda = true;
}
else if (line.Contains(states))
{
var sub = GetSubstring(line, states);
var chars = SplitOnComma(sub);
foreach (var c in chars)
{
var state = new StateModel()
{
Name = c.ToUpper()
};
automaton.States.Add(state);
}
}
else if (line.Contains(final))
{
var sub = GetSubstring(line, final);
var chars = SplitOnComma(sub);
foreach (var c in chars)
{
foreach (var state in automaton.States)
{
if (c.Equals(state.Name))
{
state.IsFinal = true;
}
}
}
}
else if (line.Contains("transitions"))
{
var lower = graphVizFileModel.Lines.IndexOf(line) + 1;
//todo: change upper to next "end."
var upper = FindUpperLimit(graphVizFileModel.Lines.IndexOf(line), graphVizFileModel.Lines);
var transitions = new List <TransitionModel>();
transitions = !automaton.IsPda ?
ReadRegularAutomatonTransitions(graphVizFileModel, lower, upper, automaton) :
ReadPdaTransitions(graphVizFileModel, lower, upper, automaton);
automaton.Transitions = transitions;
//break;
}
else if (line.Contains("words"))
{
var lower = graphVizFileModel.Lines.IndexOf(line) + 1;
var upper = FindUpperLimit(graphVizFileModel.Lines.IndexOf(line), graphVizFileModel.Lines);
automaton.Words = ReadWords(graphVizFileModel, lower, upper);
}
else if (line.Contains("dfa"))
{
var last = line[line.Length - 1];
automaton.IsDfaInFile = last == 'y';
}
else if (line.Contains("finite"))
{
var last = line[line.Length - 1];
automaton.IsFiniteInFile = last == 'y';
}
}
return(automaton);
}
private List <TransitionModel> ReadPdaTransitions(GraphVizFileModel graphVizFileModel, int lower, int upper, AutomatonModel automaton)
{
var transitions = new List <TransitionModel>();
for (int i = lower; i < upper; i++)
{
var transition = new TransitionModel();
var transitionString = graphVizFileModel.Lines[i];
var beginStateString = transitionString.Substring(0, transitionString.IndexOf(',')).Trim();
string valueString = "", leftStackString = "", rightStackString = "";
if (transitionString.Contains("["))
{
valueString =
transitionString.Substring(transitionString.IndexOf(',') + 1, transitionString.IndexOf('[') - 2)
.Trim();
leftStackString = transitionString.Substring(transitionString.IndexOf('[') + 1,
transitionString.IndexOf(',')).ToLower();
rightStackString = transitionString.Substring(transitionString.IndexOf(',', transitionString.IndexOf(',') + 1) + 1, 1).ToLower();
}
else
{
valueString =
transitionString.Substring(transitionString.IndexOf(',') + 1, transitionString.IndexOf(',') + 3)
.Trim();
leftStackString = "_";
rightStackString = "_";
}
var endStateString = transitionString.Substring(transitionString.IndexOf('>') + 1).Trim();
foreach (var state in automaton.States)
{
if (state.Name.Equals(beginStateString) && i == lower)
{
transition.BeginState = state;
state.IsInitial = true;
}
else if (state.Name.Equals(beginStateString))
{
transition.BeginState = state;
}
if (state.Name.Equals(endStateString))
{
transition.EndState = state;
}
if (transition.BeginState != null && transition.EndState != null)
{
break;
}
}
valueString = valueString.ToLower();
if (valueString.Equals("_"))
{
valueString = "ε";
}
if (leftStackString.Equals("_"))
{
leftStackString = "ε";
}
if (rightStackString.Equals("_"))
{
rightStackString = "ε";
}
transition.PushStack = rightStackString;
transition.PopStack = leftStackString;
transition.Value = valueString;
transitions.Add(transition);
}
return(transitions);
}