Allow tabs in DocTestParser

[jacksonllee]

Hello, thank you very much for this nifty library! In my use case, there are non-Python blocks that contain tabs but these tabs should just be ignored. My workaround is to let DocTestParser take an allow_tabs kwarg in my fork:

https://github.com/jacksonllee/sybil/commit/68944ab9881c8af70254317f36ae996e32faf25c

If there's any interest, I'd be more than happy to contribute a pull request so that it's available in the upstream source here as well.

[cjw296]

Can you share some examples of these non-Python blocks?
If they're not Python, how does doctest evaluate them?

[jacksonllee]

Can you share some examples of these non-Python blocks?

Absolutely. I use the reStructuredText block to illustrate a text format that happens to use tabs. Here's an (actual) example (source):

To illustrate, let us consider the following CHAT utterance with its ``%mor``
tier::

    *XXA:	喂 遲 啲 去 唔 去 旅行 啊 ?
    %mor:	e|wai3 a|ci4 u|di1 v|heoi3 d|m4 v|heoi3 vn|leoi5hang4 y|aa3 ?

If they're not Python, how does doctest evaluate them?

I'm not sure -- I haven't dug into the internals of doctest / Sybil too much. For my use case. I'd want doctest / Sybil to simply ignore blocks like this, which the commit I referred to above would allow when allow_tabs=True in DocTestParser. Would there by any chance be a better way to accomplish this that I've missed?

[cjw296]

Ah, so the problem is actually that doctest is spotting tabs in blocks it won't even match...

[cjw296]

43445d8 should resolve this, it'll be in a 2.0.1 release as soon as CI finishes running.

[jacksonllee]

Thank you for the quick fix! I've just upgraded to Sybil 2.0.1 and my CI also passed as well. Thanks again!