backtracking with try

[deflexor]

https://gist.github.com/deflexor/247f97f4a59de0de5109

Here is example of strange behaviour. Parser starts parsing '<html...' with try, but when it fails it backtracks to 'h', but not to '<' as expected

[mrkkrp]

Any reason you prefer to do it with Parsec (manually) instead of using something like tagsoup? You could track this problem further and create really minimal example, i.e. 5-10 lines that clearly demonstrate the bug (if it's a bug).

Parsec is currently in somewhat “suspended” state of development for some reason, you can take a look around to check how many issues and PR are ignored, so probably you won't get any feedback here.

I maintain a modern fork of Parsec — Megaparsec, you could give it a try, though.

[aslatter]

Hi @deflexor - it looks like your parser is failing inside the head element while parsing nested data. We can backtrack, but after backtracking the other alternative (a comment) doesn't work either so there isn't much we can do.

I think in markupParser you're not handling whitespace in between elements here: P.many1 tagorcomment.

Hey @mrkkrp - feel free to email me with any complaints about Parsec maintenance.

[mrkkrp]

@aslatter, It's definitely good that you're back, I hope there won't be such “gaps” (half a year?) in future!