public void DeadStatesTest()
{
var dfa = new Dfa <string>();
dfa.AddEdge(0, "A", 3);
dfa.AddEdge(1, "B", 3);
dfa.AddEdge(2, "C", 3);
dfa.AddEdge(0, "E", 1);
dfa.AddEdge(1, "E", 2);
dfa.AddBadState(3);
var emptyDfa = new Dfa <string>();
var rules = new Dictionary <string, IDfa <Optional <Rule <string> >, string> >
{
["A"] = dfa,
["E"] = emptyDfa
};
var grammar = new CompiledGrammar <string> {
Rules = rules
};
var nullables = new List <DfaAndState <string> >
{
new DfaAndState <string> {
Dfa = emptyDfa, State = new ValueState <int>(0)
}
};
var firstSymbols = FirstHelper <string> .GetFirstSymbols(grammar, nullables);
var expected = new[]
{
"E",
"E",
string.Empty,
string.Empty
};
for (int i = 0; i < 4; ++i)
{
var stateEntity = new DfaAndState <string> {
Dfa = dfa, State = new ValueState <int>(i)
};
string output = string.Join(',', firstSymbols[stateEntity].OrderBy(x => x));
Assert.AreEqual(expected[i], output, $"Unexpected output on test {i}: expected is [{expected[i]}], but found [{output}]");
}
}
public void ThreeDfasTest()
{
var firstDfa = new Dfa <string>();
firstDfa.AddEdge(0, "D", 1);
firstDfa.AddEdge(0, "F", 4);
firstDfa.AddEdge(0, "C", 3);
firstDfa.AddEdge(0, "B", 2);
firstDfa.AddEdge(2, "B", 7);
firstDfa.AddEdge(3, "A", 5);
firstDfa.AddEdge(4, "G", 6);
firstDfa.AddEdge(6, "A", 5);
var secondDfa = new Dfa <string>();
secondDfa.AddEdge(0, "B", 1);
secondDfa.AddEdge(0, "C", 2);
secondDfa.AddEdge(2, "A", 3);
secondDfa.AddEdge(1, "E", 4);
var thirdDfa = new Dfa <string>();
var rules = new Dictionary <string, IDfa <Optional <Rule <string> >, string> >
{
["A"] = firstDfa,
["B"] = secondDfa,
["C"] = thirdDfa
};
var grammar = new CompiledGrammar <string> {
Rules = rules
};
var nullables = new List <DfaAndState <string> >
{
new DfaAndState <string> {
Dfa = thirdDfa, State = new ValueState <int>(0)
}
};
var firstSymbols = FirstHelper <string> .GetFirstSymbols(grammar, nullables);
var expected = new[]
{
new[] { "A,B,C,D,F", string.Empty, "A,B,C,D,F", "A,B,C,D,F", "G", string.Empty, "A,B,C,D,F", string.Empty },
new[] { "A,B,C,D,F", "E", "A,B,C,D,F", string.Empty, string.Empty },
new[] { string.Empty }
};
var size = new int[] { 8, 5, 1 };
var dfas = new ConcreteDfa <Optional <Rule <string> >, string>[] { firstDfa, secondDfa, thirdDfa };
for (int test = 0; test < 3; ++test)
{
for (int i = 0; i < size[test]; ++i)
{
var stateEntity = new DfaAndState <string> {
Dfa = dfas[test], State = new ValueState <int>(i)
};
string output = string.Join(',', firstSymbols[stateEntity].OrderBy(x => x));
Assert.AreEqual(expected[test][i], output, $"Unexpected output on test ({test}, {i}): expected is [{expected[test][i]}], but found [{output}]");
}
}
}