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use nom::{
branch::alt,
bytes::complete::*,
character::complete::{anychar, space0},
combinator::value,
multi::fold_many_m_n,
IResult, Parser,
};
use nom_supreme::{error::ErrorTree, parser_ext::ParserExt, tag::complete::tag};
use std::fmt;
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub struct Paragraph<'a> {
pub words: &'a str,
}
impl<'a> fmt::Display for Paragraph<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for line in self.words.lines() {
write!(f, "{}", line)?
}
Ok(())
}
}
pub fn paragraph(input: &str) -> IResult<&str, Paragraph, ErrorTree<&str>> {
let result: IResult<&str, &str, ErrorTree<&str>> = take_until("\n\n")(input);
match result {
Ok((input, para)) => Ok((input, Paragraph { words: para })),
Err(e) => {
if input == "" {
Err(e)
} else {
Ok(("", Paragraph { words: input }))
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use nom::{error::ErrorKind, Err::Error};
#[test]
fn parse_paragraph_dash() {
assert_eq!(
paragraph("---\n\n").unwrap(),
("\n\n", Paragraph { words: "---" })
);
}
#[test]
fn parse_paragraph_multiline() {
assert_eq!(
paragraph("a line\nanotherline\nyetanotherline\n\n").unwrap(),
(
"\n\n",
Paragraph {
words: "a line\nanotherline\nyetanotherline"
}
)
);
}
}