public void ShouldDevelopSituationWithLeftRecursiveReduction()
{
SituationGraphFactory <char> situationGraphFactory;
ISituationGraph <char> graph;
LexicalRule rule1, rule2, rule3;
Situation <char> situation;
ISituationCollection <char> situations;
Terminal p1;
NonTerminal p2;
Terminal p3;
Terminal p4;
Sequence sequence;
SituationCollectionFactory <char> factory;
//A*=•{S}a
//S=•{S}b
//S=•c
p1 = new Terminal('a');
p2 = new NonTerminal("S");
p3 = new Terminal('b');
p4 = new Terminal('c');
sequence = new Sequence();
sequence.Items.Add(p2);
sequence.Items.Add(p1);
rule1 = new LexicalRule()
{
Name = "A", Predicate = sequence
};
sequence = new Sequence();
sequence.Items.Add(p2);
sequence.Items.Add(p3);
rule2 = new LexicalRule()
{
Name = "S", Predicate = sequence
};
rule3 = new LexicalRule()
{
Name = "S", Predicate = p4
};
situationGraphFactory = new SituationGraphFactory <char>(new SituationGraphSegmentFactory <char>());
graph = situationGraphFactory.BuildSituationGraph(new LexicalRule[] { rule1, rule2, rule3 });
factory = new SituationCollectionFactory <char>(graph);
situation = new Situation <char>(rule1, p2, new MockedReduceInput());
situations = factory.Develop(situation.AsEnumerable());
Assert.AreEqual(5, situations.Count);
Assert.AreEqual('a', ((ITerminalInput <char>)situations[1].Input).Value);
Assert.AreEqual('b', ((ITerminalInput <char>)situations[2].Input).Value);
Assert.AreEqual('a', ((ITerminalInput <char>)situations[3].Input).Value);
Assert.AreEqual('b', ((ITerminalInput <char>)situations[4].Input).Value);
}
public void ShouldDevelopSituations()
{
SituationGraphFactory <char> situationGraphFactory;
ISituationGraph <char> graph;
LexicalRule rule1, rule2, rule3, rule4;
Situation <char> situation;
ISituationCollection <char> situations;
NonTerminal p1, p2;
Terminal p3, p4;
Sequence sequence;
SituationCollectionFactory <char> factory;
p1 = new NonTerminal("B");
p2 = new NonTerminal("C");
p3 = new Terminal('b');
p4 = new Terminal('c');
sequence = new Sequence();
sequence.Items.Add(p1);
sequence.Items.Add(new Terminal('d'));
rule1 = new LexicalRule()
{
Name = "A", Predicate = sequence
};
rule2 = new LexicalRule()
{
Name = "B", Predicate = p2
};
rule3 = new LexicalRule()
{
Name = "B", Predicate = p3
};
rule4 = new LexicalRule()
{
Name = "C", Predicate = p4
};
situationGraphFactory = new SituationGraphFactory <char>(new SituationGraphSegmentFactory <char>());
graph = situationGraphFactory.BuildSituationGraph(new LexicalRule[] { rule1, rule2, rule3, rule4 });
factory = new SituationCollectionFactory <char>(graph);
situation = new Situation <char>(rule1, p1, new MockedReduceInput());
situations = factory.Develop(situation.AsEnumerable());
Assert.AreEqual(4, situations.Count);
Assert.AreEqual(p1, situations[0].Predicate);
Assert.AreEqual(p2, situations[1].Predicate);
Assert.AreEqual('d', ((ITerminalInput <char>)situations[1].Input).Value);
Assert.AreEqual(p3, situations[2].Predicate);
Assert.AreEqual('d', ((ITerminalInput <char>)situations[2].Input).Value);
Assert.AreEqual(p4, situations[3].Predicate);
Assert.AreEqual('d', ((ITerminalInput <char>)situations[3].Input).Value);
}
public void ShouldCreateNextSituationsUsingLettersRange()
{
Terminal a, c;
AnyTerminal b;
Sequence predicate;
SituationGraphFactory <char> situationGraphFactory;
ISituationGraph <char> graph;
ISituation <char>[] items;
LexicalRule rule;
Situation <char> situation;
SituationCollectionFactory <char> factory;
a = new Terminal('a');
b = new AnyTerminal();
c = new Terminal('c');
predicate = new Sequence();
predicate.Items.Add(a);
predicate.Items.Add(b);
predicate.Items.Add(c);
predicate.Items.Add(new Reduce());
rule = new LexicalRule()
{
Name = "A", Predicate = predicate
};
situationGraphFactory = new SituationGraphFactory <char>(new SituationGraphSegmentFactory <char>());
graph = situationGraphFactory.BuildSituationGraph(rule.AsEnumerable());
factory = new SituationCollectionFactory <char>(graph);
situation = new Situation <char>(rule, a, new MockedReduceInput());
items = factory.CreateNextSituations(situation.AsEnumerable(), new TerminalInput('b')).ToArray();
Assert.AreEqual(0, items.Length);
situation = new Situation <char>(rule, a, new MockedReduceInput());
items = factory.CreateNextSituations(situation.AsEnumerable(), new TerminalInput('a')).ToArray();
Assert.AreEqual(1, items.Length);
Assert.AreEqual(b, items[0].Predicate);
situation = new Situation <char>(rule, b, new MockedReduceInput());
items = factory.CreateNextSituations(situation.AsEnumerable(), new TerminalInput('b')).ToArray();
Assert.AreEqual(1, items.Length);
Assert.AreEqual(c, items[0].Predicate);
situation = new Situation <char>(rule, b, new MockedReduceInput());
items = factory.CreateNextSituations(situation.AsEnumerable(), new TerminalRangeInput(char.MinValue, char.MaxValue)).ToArray();
Assert.AreEqual(1, items.Length);
Assert.AreEqual(c, items[0].Predicate);
situation = new Situation <char>(rule, c, new MockedReduceInput());
items = factory.CreateNextSituations(situation.AsEnumerable(), new TerminalInput('c')).ToArray();
Assert.AreEqual(1, items.Length);
Assert.IsTrue(items[0].Predicate.Equals(new Reduce()));
}
public void ShouldDevelopSituationWithLoopReduction()
{
SituationGraphFactory <char> situationGraphFactory;
ISituationGraph <char> graph;
LexicalRule rule1, rule2, rule3;
Situation <char> situation;
ISituationCollection <char> situations;
Terminal p1;
NonTerminal p2;
NonTerminal p3;
SituationCollectionFactory <char> factory;
OneOrMore oneOrMore;
//"L=a"
//"N={L}+"
//"A*={N}"
p1 = new Terminal('a');
p2 = new NonTerminal("L");
p3 = new NonTerminal("N");
rule1 = new LexicalRule()
{
Name = "L", Predicate = new Sequence(p1, new Reduce())
};
oneOrMore = new OneOrMore();
oneOrMore.Item = p2;
rule2 = new LexicalRule()
{
Name = "N", Predicate = new Sequence(oneOrMore, new Reduce())
};
rule3 = new LexicalRule()
{
Name = "A", Predicate = new Sequence(p3, new Reduce())
};
situationGraphFactory = new SituationGraphFactory <char>(new SituationGraphSegmentFactory <char>());
graph = situationGraphFactory.BuildSituationGraph(new LexicalRule[] { rule1, rule2, rule3 });
factory = new SituationCollectionFactory <char>(graph);
situation = new Situation <char>(rule3, p3, new MockedReduceInput());
situations = factory.Develop(situation.AsEnumerable());
Assert.AreEqual(5, situations.Count);
Assert.AreEqual('a', ((ITerminalInput <char>)situations[2].Input).Value);
Assert.AreEqual('a', ((ITerminalInput <char>)situations[4].Input).Value);
}
public void ShouldDevelopSituationEndingWithReductionOnNonTerminal()
{
SituationGraphFactory <char> situationGraphFactory;
ISituationGraph <char> graph;
LexicalRule rule1, rule2;
Situation <char> situation;
ISituationCollection <char> situations;
Terminal p1;
NonTerminal p2;
Terminal p3;
Sequence sequence;
SituationCollectionFactory <char> factory;
p1 = new Terminal('a');
p2 = new NonTerminal("B");
p3 = new Terminal('b');
sequence = new Sequence();
sequence.Items.Add(p1);
sequence.Items.Add(p2);
sequence.Items.Add(new Reduce());
rule1 = new LexicalRule()
{
Name = "A", Predicate = sequence
};
rule2 = new LexicalRule()
{
Name = "B", Predicate = p3
};
situationGraphFactory = new SituationGraphFactory <char>(new SituationGraphSegmentFactory <char>());
graph = situationGraphFactory.BuildSituationGraph(new LexicalRule[] { rule1, rule2 });
factory = new SituationCollectionFactory <char>(graph);
situation = new Situation <char>(rule1, p2, new MockedReduceInput());
situations = factory.Develop(situation.AsEnumerable());
Assert.AreEqual(2, situations.Count);
Assert.AreEqual(p3, situations[1].Predicate);
}