public void NonTerminal_Predicate_And()
{
// predicates should not adjust the
// iterator once the expression is evaluated.
AExpression Digit = new CharacterClass {ClassExpression = "[0-9]"};
// regex expression: \d+
var input = Encoding.UTF8.GetBytes("01234567890123456789");
var iterator = new ByteInputIterator(input);
AExpression andPredicate = new OneOrMore(Digit).And();
var visitor = new NpegParserVisitor(iterator);
andPredicate.Accept(visitor);
Assert.IsTrue(visitor.IsMatch);
Assert.IsTrue(iterator.Index == 0);
}
public void NonTerminal_Predicate_Or()
{
// predicates should not adjust the
// iterator once the expression is evaluated.
AExpression Digit = new CharacterClass {ClassExpression = "[0-9]"};
// equivalent to: regex '^' '$'
// regex expression: ^\d+$
var bytes = Encoding.UTF8.GetBytes("0123456abcdefg");
var iterator = new ByteInputIterator(bytes);
AExpression notPredicate = new OneOrMore(Digit).And().Sequence(new NotPredicate(new AnyCharacter()));
var visitor = new NpegParserVisitor(iterator);
notPredicate.Accept(visitor);
Assert.IsFalse(visitor.IsMatch); // should fail
Assert.IsTrue(iterator.Index == 0);
}
