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use nom::{
branch::alt,
bytes::complete::{tag, take_till1},
combinator::all_consuming,
error::ParseError,
sequence::pair,
IResult,
};
use crate::bstr::{BStr, ByteSlice};
pub(crate) fn newline<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], &'a [u8], E> {
alt((tag(b"\r\n"), tag(b"\n")))(i)
}
fn subject_and_body<'a, E: ParseError<&'a [u8]>>(i: &'a [u8]) -> IResult<&'a [u8], (&'a BStr, Option<&'a BStr>), E> {
let mut c = i;
let mut consumed_bytes = 0;
while !c.is_empty() {
c = match take_till1::<_, _, E>(|c| c == b'\n' || c == b'\r')(c) {
Ok((i1, segment)) => {
consumed_bytes += segment.len();
match pair::<_, _, _, E, _, _>(newline, newline)(i1) {
Ok((body, _)) => {
return Ok((
&[],
(
i[0usize..consumed_bytes].as_bstr(),
(!body.is_empty()).then(|| body.as_bstr()),
),
));
}
Err(_) => match i1.get(1..) {
Some(next) => {
consumed_bytes += 1;
next
}
None => break,
},
}
}
Err(_) => match c.get(1..) {
Some(next) => {
consumed_bytes += 1;
next
}
None => break,
},
};
}
Ok((&[], (i.as_bstr(), None)))
}
/// Returns title and body, without separator
pub fn message(input: &[u8]) -> (&BStr, Option<&BStr>) {
all_consuming(subject_and_body::<()>)(input).expect("cannot fail").1
}
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