use regex_automata::{dfa::Automaton, Anchored, Input};

use crate::unicode::fsm::{

    whitespace_anchored_fwd::WHITESPACE_ANCHORED_FWD,

    whitespace_anchored_rev::WHITESPACE_ANCHORED_REV,

};

/// Return the first position of a non-whitespace character.

pub fn whitespace_len_fwd(slice: &[u8]) -> usize {

    let input = Input::new(slice).anchored(Anchored::Yes);

    WHITESPACE_ANCHORED_FWD

        .try_search_fwd(&input)

        .unwrap()

        .map_or(0, |hm| hm.offset())

}

/// Return the last position of a non-whitespace character.

pub fn whitespace_len_rev(slice: &[u8]) -> usize {

    let input = Input::new(slice).anchored(Anchored::Yes);

    WHITESPACE_ANCHORED_REV

        .try_search_rev(&input)

        .unwrap()

        .map_or(slice.len(), |hm| hm.offset())

}