Function combine::tokens_cmp
source · [−]pub fn tokens_cmp<C, T, I>(tokens: T, cmp: C) -> TokensCmp<C, T, I> where
C: FnMut(T::Item, I::Token) -> bool,
T: Clone + IntoIterator,
I: Stream,
Expand description
Parses multiple tokens.
Consumes items from the input and compares them to the values from tokens
using the
comparison function cmp
. Succeeds if all the items from tokens
are matched in the input
stream and fails otherwise.
let result = tokens_cmp("abc".chars(), |l, r| l.eq_ignore_ascii_case(&r))
.parse("AbC")
.map(|x| x.0.as_str());
assert_eq!(result, Ok("abc"));
let result = tokens_cmp(
&b"025"[..],
|&l, r| (if l < r { r - l } else { l - r }) <= 2,
)
.parse(&b"123"[..])
.map(|x| x.0);
assert_eq!(result, Ok(&b"025"[..]));