organic/src/parser/nom_context.rs

use nom::branch::alt;
use nom::error::VerboseError;
use nom::IResult;

#[derive(Clone)]
pub struct NomContext<F>
where
    F: for<'a> FnMut(&'a str) -> IResult<&'a str, &'a str, VerboseError<&'a str>>,
    F: Clone,
{
    pub fail_matcher: F,

    /// You can't have nested bolds in org-mode
    pub can_match_bold: bool,
    pub can_match_link: bool,
}

impl<F> NomContext<F>
where
    F: for<'a> FnMut(&'a str) -> IResult<&'a str, &'a str, VerboseError<&'a str>>,
    F: Clone,
{
    pub fn new(fail_matcher: F) -> Self {
        NomContext {
            fail_matcher,
            can_match_bold: true,
            can_match_link: true,
        }
    }

    pub fn without_bold(&self) -> Self {
        NomContext {
            fail_matcher: self.fail_matcher.clone(),
            can_match_bold: true,
            can_match_link: true,
        }
    }

    pub fn with_additional_fail_matcher<G>(
        &self,
        mut additional_fail_matcher: G,
    ) -> NomContext<
        impl Clone + for<'o> FnMut(&'o str) -> IResult<&'o str, &'o str, VerboseError<&'o str>>,
    >
    where
        G: for<'g> FnMut(&'g str) -> IResult<&'g str, &'g str, VerboseError<&'g str>>,
        G: Clone,
    {
        let mut old_fail_matcher_clone = self.fail_matcher.clone();
        NomContext {
            fail_matcher: move |i| {
                alt((&mut additional_fail_matcher, &mut old_fail_matcher_clone))(i)
            },
            can_match_bold: self.can_match_bold,
            can_match_link: self.can_match_link,
        }
    }
}