[−][src]Function gchemol_parser::parsers::map
pub fn map<I, O1, O2, E, F, G>(first: F, second: G) -> impl Fn(I) where
E: ParseError<I>,
F: Fn(I) -> Result<(I, O1), Err<E>>,
G: Fn(O1) -> O2,
maps a function on the result of a parser
use nom::character::complete::digit1; use nom::combinator::map; let parse = map(digit1, |s: &str| s.len()); // the parser will count how many characters were returned by digit1 assert_eq!(parse("123456"), Ok(("", 6))); // this will fail if digit1 fails assert_eq!(parse("abc"), Err(Err::Error(("abc", ErrorKind::Digit))));