How to parse remaining input based on part of parsed input about combine

[Marwes]

Asking questions here is fine, no worries.

If you are fine with using the unstable range_stream feature there is a range parser which should do what you want. It might be worth adding the equivalent parser for normal streams as well though. I think you should be able to create a parser like that using the iter method.

In the then call you should be able to write something like

parser(move |input| {
    let mut iter = letter().iter(input);
    let result = iter.by_ref().take(decimal).collect();
    iter.into_result(result)
})

If there are less than decimal 'letter' characters this will still succeed though so you might want to check the result after parsing.

[jivagoalves]

@Marwes , thanks for your quick reply!

I did see the unstable range_stream feature but wanted to rely on stable ones only. So I'm ignoring it until I have a solution for normal streams. Having said that, is there any way to combine the parsers dynamically (e.g. folding/reducing to have a combined parser)?

[Marwes]

Boxing each parser is always possible but I don't think it is a good idea in this case as you would basically need to construct a parser for every different length (and you would need one box per fold so 8 in the case above).

[jivagoalves]

I see. I guess I'll use the range_stream feature for now. Thanks once again for your valuable input!