Function chomp::parsers::satisfy_with [−] [src]

pub fn satisfy_with<I: Input, T: Clone, F, P>(
    i: I, 
    f: F, 
    p: P
) -> SimpleResult<I, T> where
    F: FnOnce(I::Token) -> T,
    P: FnOnce(T) -> bool,

Reads a single token, applies the transformation F and then succeeds with the transformed valeue if the predicate P yields true on this transformed value.

use std::ascii::AsciiExt;

use chomp::prelude::{parse_only, satisfy_with};

let r = parse_only(
    |i| satisfy_with(i, |c| AsciiExt::to_ascii_uppercase(&c), |c| c == b'T'),
    b"testing");

assert_eq!(r, Ok(b'T'));