public virtual void TestBasicAutomata()
{
AssertAutomatonHits(0, BasicAutomata.MakeEmpty());
AssertAutomatonHits(0, BasicAutomata.MakeEmptyString());
AssertAutomatonHits(2, BasicAutomata.MakeAnyChar());
AssertAutomatonHits(3, BasicAutomata.MakeAnyString());
AssertAutomatonHits(2, BasicAutomata.MakeString("doc"));
AssertAutomatonHits(1, BasicAutomata.MakeChar('a'));
AssertAutomatonHits(2, BasicAutomata.MakeCharRange('a', 'b'));
AssertAutomatonHits(2, BasicAutomata.MakeInterval(1233, 2346, 0));
AssertAutomatonHits(1, BasicAutomata.MakeInterval(0, 2000, 0));
AssertAutomatonHits(2, BasicOperations.Union(BasicAutomata.MakeChar('a'), BasicAutomata.MakeChar('b')));
AssertAutomatonHits(0, BasicOperations.Intersection(BasicAutomata.MakeChar('a'), BasicAutomata.MakeChar('b')));
AssertAutomatonHits(1, BasicOperations.Minus(BasicAutomata.MakeCharRange('a', 'b'), BasicAutomata.MakeChar('a')));
}
/// <summary>
/// Convert Lucene wildcard syntax into an automaton.
/// <para/>
/// @lucene.internal
/// </summary>
public static Automaton ToAutomaton(Term wildcardquery)
{
IList <Automaton> automata = new JCG.List <Automaton>();
string wildcardText = wildcardquery.Text;
for (int i = 0; i < wildcardText.Length;)
{
int c = Character.CodePointAt(wildcardText, i);
int length = Character.CharCount(c);
switch (c)
{
case WILDCARD_STRING:
automata.Add(BasicAutomata.MakeAnyString());
break;
case WILDCARD_CHAR:
automata.Add(BasicAutomata.MakeAnyChar());
break;
case WILDCARD_ESCAPE:
// add the next codepoint instead, if it exists
if (i + length < wildcardText.Length)
{
int nextChar = Character.CodePointAt(wildcardText, i + length);
length += Character.CharCount(nextChar);
automata.Add(BasicAutomata.MakeChar(nextChar));
break;
} // else fallthru, lenient parsing with a trailing \
goto default;
default:
automata.Add(BasicAutomata.MakeChar(c));
break;
}
i += length;
}
return(BasicOperations.Concatenate(automata));
}