feature request: `maybe_delimited`

rust-bakery / nom

Rust parser combinator framework

MIT License

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Open zeenix opened 1 month ago

zeenix commented 1 month ago

I would like something like:

delimited(
    opt(char('(')),
    many1(my_parser),
    opt(char(')'),
)

so that outer () are optional but I would only want them optional together so unmatched () are treated as an error.

A maybe_delimited function that treats the delimiters as optional in combination, would help with this.

I cant provide this if needed but of course it would not work currently. :)

scnerd commented 4 weeks ago

Could be easily written as alt(body | delimited(left, body, right)), right?