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lib.rs
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lib.rs
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use nom::{
branch::alt,
combinator::map,
multi::{separated_list1, many1},
IResult,
InputLength,
};
pub fn separated_lines_ignore<I: Clone + InputLength, O, O2, O3>(
sep: impl FnMut(I) -> IResult<I, O2>,
f: impl FnMut(I) -> IResult<I, O>,
ignore: impl FnMut(I) -> IResult<I, O3>,
) -> impl FnMut(I) -> IResult<I, Vec<O>>
{
map(
separated_list1(
many1(sep),
alt((
map(f, |l| Some(l)),
map(ignore, |_| None)
))
),
|ls| ls.into_iter().flatten().collect(),
)
}
#[cfg(test)]
mod tests {
use nom::{bytes::complete::tag, character::complete::line_ending};
use nom::{
IResult,
error::ParseError,
combinator::value,
sequence::pair,
bytes::complete::is_not,
character::complete::char,
};
use super::*;
#[test]
fn should_parse_multiple_lines() {
let mut parser = separated_lines_ignore(line_ending, tag("a"), line_ending);
assert_eq!(parser("a\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n\n\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n\n\n\na"), Ok(("", vec!["a", "a"])));
}
fn peol_comment<'a, E: ParseError<&'a str>>(i: &'a str) -> IResult<&'a str, (), E>
{
value(
(),
pair(char('%'), is_not("\n\r"))
)(i)
}
#[test]
fn should_parse_multiple_comments_lines() {
let mut parser = separated_lines_ignore(line_ending, tag("a"), peol_comment);
assert_eq!(parser("a\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n%hello\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n%hello\n%world\na"), Ok(("", vec!["a", "a"])));
assert_eq!(parser("a\n%hi\n\n%world\na"), Ok(("", vec!["a", "a"])));
}
}