package containers

Alias to map. p >|= f parses an item x using p, and returns f x.

Alias to bind. p >>= f results in a new parser which behaves as p then, in case of success, applies f to the result.

Applicative.

a <* b parses a into x, parses b and ignores its result, and returns x.

a *> b parses a, then parses b into x, and returns x. The result of a is ignored.

Alias to or_.

a <|> b tries to parse a, and if a fails without consuming any input, backtracks and tries to parse b, otherwise it fails as a. See try_ to ensure a does not consume anything (but it is best to avoid wrapping large parsers with try_).

a <?> msg behaves like a, but if a fails, a <?> msg fails with msg instead. Useful as the last choice in a series of <|>. For example: a <|> b <|> c <?> "expected one of a, b, c".

Alias to both. a ||| b parses a, then b, then returns the pair of their results.

• since 3.6