regexml 0.2.2

XPath compatible regex engine
Documentation 
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use crate::{
    operation::{Operation, OperationControl, MATCHES_ZLS_AT_END},
    re_flags::ReFlags,
    re_matcher::ReMatcher,
};

// End of Line ($) in a regular expression
#[derive(Debug, Clone)]
pub(crate) struct Eol;

impl OperationControl for Eol {
    fn get_match_length(&self) -> Option<usize> {
        Some(0)
    }

    fn matches_empty_string(&self) -> u32 {
        MATCHES_ZLS_AT_END
    }

    fn optimize(self, _flags: &ReFlags) -> Operation {
        Operation::from(self)
    }

    fn matches_iter(
        &self,
        matcher: &ReMatcher,
        position: usize,
    ) -> Box<dyn Iterator<Item = usize>> {
        let search = &matcher.search;

        if matcher.program.flags.is_multi_line() {
            if search.is_empty() || position >= search.len() || matcher.is_new_line(position) {
                Box::new(std::iter::once(position))
            } else {
                Box::new(std::iter::empty())
            }
        } else if search.is_empty() || position >= search.len() {
            Box::new(std::iter::once(position))
        } else {
            Box::new(std::iter::empty())
        }
    }
}