88 lines
2.1 KiB
Rust
88 lines
2.1 KiB
Rust
use nom::{
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branch::alt,
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bytes::complete::{tag, take_while},
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combinator::opt,
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multi::many1,
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sequence::{delimited, pair, tuple},
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IResult,
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};
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use std::fmt;
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use crate::imf::mailbox::is_dtext;
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use crate::text::whitespace::cfws;
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use crate::text::words::dot_atom_text;
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#[derive(PartialEq, Clone)]
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pub struct MessageID<'a> {
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pub left: &'a [u8],
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pub right: &'a [u8],
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}
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impl<'a> ToString for MessageID<'a> {
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fn to_string(&self) -> String {
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format!(
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"{}@{}",
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String::from_utf8_lossy(self.left),
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String::from_utf8_lossy(self.right)
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)
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}
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}
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impl<'a> fmt::Debug for MessageID<'a> {
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt.debug_tuple("MessageID")
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.field(&format_args!("\"{}\"", self.to_string()))
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.finish()
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}
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}
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pub type MessageIDList<'a> = Vec<MessageID<'a>>;
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/// Message identifier
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///
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/// ```abnf
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/// msg-id = [CFWS] "<" id-left "@" id-right ">" [CFWS]
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/// ```
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pub fn msg_id(input: &[u8]) -> IResult<&[u8], MessageID> {
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let (input, (left, _, right)) = delimited(
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pair(opt(cfws), tag("<")),
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tuple((id_left, tag("@"), id_right)),
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pair(tag(">"), opt(cfws)),
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)(input)?;
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Ok((input, MessageID { left, right }))
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}
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pub fn msg_list(input: &[u8]) -> IResult<&[u8], MessageIDList> {
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many1(msg_id)(input)
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}
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// @FIXME Missing obsolete
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fn id_left(input: &[u8]) -> IResult<&[u8], &[u8]> {
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dot_atom_text(input)
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}
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// @FIXME Missing obsolete
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fn id_right(input: &[u8]) -> IResult<&[u8], &[u8]> {
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alt((dot_atom_text, no_fold_litteral))(input)
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}
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fn no_fold_litteral(input: &[u8]) -> IResult<&[u8], &[u8]> {
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delimited(tag("["), take_while(is_dtext), tag("]"))(input)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_msg_id() {
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assert_eq!(
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msg_id(b"<5678.21-Nov-1997@example.com>"),
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Ok((
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&b""[..],
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MessageID {
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left: &b"5678.21-Nov-1997"[..],
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right: &b"example.com"[..],
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}
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)),
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);
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}
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}
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