Function chumsky::primitive::filter [−][src]
pub fn filter<I, F: Fn(&I) -> bool, E>(f: F) -> Filter<F, E>
Expand description
A parser that accepts only tokens that match the given predicate.
Examples
use chumsky::prelude::*; let lowercase = filter::<_, _, Simple<char>>(char::is_ascii_lowercase) .repeated_at_least(1) .padded_by(end()) .collect::<String>(); assert_eq!(lowercase.parse("hello"), Ok("hello".to_string())); assert!(lowercase.parse("Hello").is_err());