public static Tuple <int, List <string>, string> FeedbackForWhileToTM <S>(WExpr correctProgram, TMCB <int, S> attemptTM, int maxGrade)
{
//returns grade, feedback strings, and a sample input for the tape simulator
TMCB <int, int> correctTM = correctProgram.ToTMCB(-1);
int numTapes = correctProgram.GetNumVariables();
const int numInputs = 100;
const int maxWrongOutpus = 5; //max number of wrong outputs the user is shown.
//<correctTM> and <attemptTM> are compared by running both on a set of test inputs and comparing the outputs.
int inputsPerTape = (int)Math.Pow(numInputs, (double)1 / numTapes);
List <string> wrongOutputList = new List <string>();
string sampleInput = "";
int countCorrectOutputs = 0;
int countWrongOutpus = 0;
bool dummy;
foreach (int[][] input in WhileUtilities.NonNegIntTestInputs(numTapes, inputsPerTape, correctProgram.GetUselessVariables().ToArray()))
{
int[][] correctOutput = correctTM.Run(input, out dummy);
//<correctTM> uses LSBF encoding, <attemptTM> uses MSBF encoding. Reverse <input> for <attemptTM>.
for (int i = 0; i < input.Length; ++i)
{
input[i] = input[i].Reverse().ToArray();
}
int[][] attemptOutput = attemptTM.Run(input, out dummy);
//for comparing the outputs, reverse <correctOutput>
for (int i = 0; i < correctOutput.Length; ++i)
{
correctOutput[i] = correctOutput[i].Reverse().ToArray();
}
//get string representations of the outputs
string[] correctStrings = Array.ConvertAll(correctOutput, tape => WhileUtilities.TapeToString(tape, correctTM.blank, new[] { 0 }, "_"));
string[] attemptStrings = Array.ConvertAll(attemptOutput, tape => WhileUtilities.TapeToString(tape, attemptTM.blank, new[] { 0 }, "_"));
if (WhileUtilities.TapesEqual(correctStrings, attemptStrings))
{
++countCorrectOutputs;
}
else
{
if (countWrongOutpus == 0)
{
//first wrong output: corresponding input is stored in <sampleInput>
string[] tapes = Array.ConvertAll(input, tape => WhileUtilities.TapeToString(tape, correctTM.blank, new[] { 0 }, "_"));
sampleInput = string.Join(",", tapes);
}
++countWrongOutpus;
if (countWrongOutpus <= maxWrongOutpus)
{
wrongOutputList.Add(string.Empty);
wrongOutputList.Add($"Input #{countWrongOutpus}:");
for (int i = 0; i < input.Length; ++i)
{
wrongOutputList.Add($"tape {i}: {WhileUtilities.TapeToString(input[i], correctTM.blank, null)}");
}
wrongOutputList.Add("Your output:");
for (int i = 0; i < attemptStrings.Length; ++i)
{
wrongOutputList.Add($"tape {i}: {attemptStrings[i]}");
}
wrongOutputList.Add("Correct output:");
for (int i = 0; i < correctStrings.Length; ++i)
{
wrongOutputList.Add($"tape {i}: {correctStrings[i]}");
}
}
}
}
double actualInputs = Math.Pow(inputsPerTape, numTapes);
int grade = (int)((countCorrectOutputs / actualInputs) * maxGrade);
List <string> feedbackList = new List <string>();
if (countWrongOutpus == 0)
{
feedbackList.Add("Correct!");
}
else
{
if (countWrongOutpus <= maxWrongOutpus)
{
feedbackList.Add($"{countWrongOutpus} of {actualInputs} outpus were wrong:");
}
else
{
feedbackList.Add($"{countWrongOutpus} of {actualInputs} outpus were wrong. Here are {maxWrongOutpus} of them:");
}
foreach (string line in wrongOutputList)
{
feedbackList.Add(line);
}
}
return(new Tuple <int, List <string>, string>(grade, feedbackList, sampleInput));
}
//public static TMCB<char, string> ParseTMFromXML(XElement automaton_wrapped)
//{
// var Q = new HashSet<State<string>>();
// var F = new HashSet<State<string>>();
// State<string> q0 = null;
// var Sigma = new HashSet<char>();
// var Gamma = new HashSet<char>();
// char blank = '?';
// //var Delta = new Dictionary<TwoTuple<State<string>, string>, ThreeTuple<State<string>, string, string>>();
// var IdStateDict = new Dictionary<int, State<string>>();
// XElement automaton = XElement.Parse(RemoveAllNamespaces(automaton_wrapped.ToString()));
// //Parse Q:
// XElement stateSet = automaton.Element("stateSet");
// foreach (XElement child in stateSet.Elements("state"))
// {
// try
// {
// int id = Int32.Parse(child.Element("id").Value);
// string label = child.Element("label").Value;
// var q = new State<string>(id, label);
// Q.Add(q);
// IdStateDict.Add(id, q);
// }
// catch (NullReferenceException e)
// {
// int x = 0;
// }
// }
// //Parse F:
// XElement acceptingSet = automaton.Element("acceptingSet");
// foreach (XElement child in acceptingSet.Elements("state"))
// {
// State<string> q;
// int id = (int)child.Attribute("sid");
// if (!IdStateDict.TryGetValue(id, out q))
// {
// //TODO: Throw even more exceptions
// }
// F.Add(q);
// }
// //Parse Sigma and Gamma:
// XElement alphabet = automaton.Element("alphabet");
// foreach (XElement child in alphabet.Elements("symbol"))
// {
// char symbol = Convert.ToChar(child.Value);
// Gamma.Add(symbol);
// if (symbol != blank)
// Sigma.Add(Convert.ToChar(child.Value));
// }
// TMCB<char, string> rv = new TMCB<char, string>(Q, F, Sigma, Gamma, blank);
// //Parse q0:
// //TODO: exception for multiple initial states
// XElement initState = automaton.Element("initState");
// foreach (XElement child in initState.Elements("state"))
// {
// int id = (int)child.Attribute("sid");
// if (!IdStateDict.TryGetValue(id, out q0))
// {
// //TODO: throw exception
// }
// else
// {
// rv.q0 = q0;
// }
// }
// //Parse Delta:
// XElement transitionSet = automaton.Element("transitionSet");
// foreach (XElement child in transitionSet.Elements("transition"))
// {
// int from_id = Int32.Parse(child.Element("from").Value);
// int to_id = Int32.Parse(child.Element("to").Value);
// string read = Convert.ToString(child.Element("read").Value);
// string write = Convert.ToString(child.Element("write").Value);
// string head = Convert.ToString(child.Element("head").Value);
// State<string> q1, q2;
// if (!IdStateDict.TryGetValue(from_id, out q1) | !IdStateDict.TryGetValue(to_id, out q2))
// {
// //TODO: throw exception
// }
// else
// {
// //only works if read, write and head have the same lengths
// Transition<char, string> t = new Transition<char, string>();
// for (int i = 0; i < read.Length; ++i)
// {
// char readSymbol = read[i];
// char writeSymbol = write[i];
// char headSymbol = head[i];
// t.AddReadCondition(i, read[i]);
// //only add write action if the symbol actually gets changed
// //only add move action if the head actually moves
// if (readSymbol != writeSymbol)
// {
// t.AddWriteAction(i, write[i]);
// }
// if (headSymbol == 'R')
// {
// t.AddMoveAction(i, Directions.Right);
// }
// if (headSymbol == 'L')
// {
// t.AddMoveAction(i, Directions.Left);
// }
// }
// //only set target state if it is different from the source state
// if (q1 != q2)
// {
// t.TargetState = q2;
// }
// rv.AddTransition(q1, t);
// }
// }
// return rv;
//}
#endregion
//not yet tested at all
#region <int, string>
public static TMCB <int, string> ParseTMFromXML(XElement automaton_wrapped)
{
var Q = new HashSet <State <string> >();
var F = new HashSet <State <string> >();
State <string> q0 = null;
var Sigma = new HashSet <int>();
var Gamma = new HashSet <int>();
int blank = -1;
//var Delta = new Dictionary<TwoTuple<State<string>, string>, ThreeTuple<State<string>, string, string>>();
var IdStateDict = new Dictionary <int, State <string> >();
XElement automaton = XElement.Parse(RemoveAllNamespaces(automaton_wrapped.ToString()));
//Parse Q:
XElement stateSet = automaton.Element("stateSet");
foreach (XElement child in stateSet.Elements("state"))
{
try
{
int id = Int32.Parse(child.Element("id").Value);
string label = child.Element("label").Value;
var q = new State <string>(id, label);
Q.Add(q);
IdStateDict.Add(id, q);
}
catch (NullReferenceException e)
{
int x = 0;
}
}
//Parse F:
XElement acceptingSet = automaton.Element("acceptingSet");
foreach (XElement child in acceptingSet.Elements("state"))
{
State <string> q;
int id = (int)child.Attribute("sid");
if (!IdStateDict.TryGetValue(id, out q))
{
//TODO: Throw even more exceptions
}
F.Add(q);
}
//Parse Sigma and Gamma:
XElement alphabet = automaton.Element("alphabet");
foreach (XElement child in alphabet.Elements("symbol"))
{
char symbol = Convert.ToChar(child.Value);
int intSymbol;
if (!charToInt(symbol, blank, out intSymbol))
{
//TODO: exception
}
Gamma.Add(intSymbol);
if (intSymbol != blank)
{
Sigma.Add(intSymbol);
}
}
TMCB <int, string> rv = new TMCB <int, string>(Q, F, Sigma, Gamma, blank);
//Parse q0:
//TODO: exception for multiple initial states
XElement initState = automaton.Element("initState");
foreach (XElement child in initState.Elements("state"))
{
int id = (int)child.Attribute("sid");
if (!IdStateDict.TryGetValue(id, out q0))
{
//TODO: throw exception
}
else
{
rv.q0 = q0;
}
}
//Parse Delta:
XElement transitionSet = automaton.Element("transitionSet");
foreach (XElement child in transitionSet.Elements("transition"))
{
int from_id = Int32.Parse(child.Element("from").Value);
int to_id = Int32.Parse(child.Element("to").Value);
string read = Convert.ToString(child.Element("read").Value);
string write = Convert.ToString(child.Element("write").Value);
string head = Convert.ToString(child.Element("head").Value);
State <string> q1, q2;
if (!IdStateDict.TryGetValue(from_id, out q1) | !IdStateDict.TryGetValue(to_id, out q2))
{
//TODO: throw exception
}
else
{
//only works if read, write and head have the same lengths
Transition <int, string> t = new Transition <int, string>();
for (int i = 0; i < read.Length; ++i)
{
int readSymbol;
if (!charToInt(read[i], blank, out readSymbol))
{
//TODO: exception
}
int writeSymbol;
if (!charToInt(write[i], blank, out writeSymbol))
{
//TODO: exception
}
char headSymbol = head[i];
t.AddReadCondition(i, readSymbol);
//only add write action if the symbol actually gets changed
//only add move action if the head actually moves
if (readSymbol != writeSymbol)
{
t.AddWriteAction(i, writeSymbol);
}
if (headSymbol == 'R')
{
t.AddMoveAction(i, Directions.Right);
}
if (headSymbol == 'L')
{
t.AddMoveAction(i, Directions.Left);
}
}
//only set target state if it is different from the source state
if (q1 != q2)
{
t.TargetState = q2;
}
rv.AddTransition(q1, t);
}
}
return(rv);
}