public void OptionalTest()
{
Combinator.Optional(Chars.Any())
.Run("inputString".AsStream())
.Case(
failure: (restStream, _) => Assert.Fail(),
success: (restStream, optionalValue) =>
{
Assert.True(optionalValue.HasValue);
Assert.AreEqual('i', optionalValue.Value);
});
Combinator.Optional(Chars.Any())
.Run("".AsStream())
.Case(
failure: (restStream, _) => Assert.Fail(),
success: (restStream, optionalValue) =>
{
Assert.False(optionalValue.HasValue);
});
Combinator.Optional(Combinator.Sequence("inpXtString".Select(Chars.Char)))
.Run("inputString".AsStream())
.Case(
failure: (restStream, _) => Assert.Fail(),
success: (restStream, optionalValue) =>
{
Assert.False(optionalValue.HasValue);
Assert.True(restStream.Current.HasValue);
Assert.AreEqual('i', restStream.Current.Value.Item0);
Assert.AreEqual(1, restStream.Current.Value.Item1.Line);
Assert.AreEqual(1, restStream.Current.Value.Item1.Column);
});
}