[−][src]Function gchemol_parser::parsers::peek
pub fn peek<I, O, E, F>(f: F) -> impl Fn(I) where
E: ParseError<I>,
F: Fn(I) -> Result<(I, O), Err<E>>,
I: Clone,
tries to apply its parser without consuming the input
use nom::combinator::peek; use nom::character::complete::alpha1; let parser = peek(alpha1); assert_eq!(parser("abcd;"), Ok(("abcd;", "abcd"))); assert_eq!(parser("123;"), Err(Err::Error(("123;", ErrorKind::Alpha))));