55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
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use std::borrow::Cow;
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use nom::{
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IResult,
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branch::alt,
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bytes::complete::{take_while, tag},
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combinator::opt,
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sequence::{delimited, pair, tuple},
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};
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use crate::whitespace::cfws;
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use crate::words::dot_atom_text;
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use crate::mailbox::is_dtext;
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use crate::model::MessageId;
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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: &str) -> IResult<&str, 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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// Missing obsolete
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fn id_left(input: &str) -> IResult<&str, &str> {
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dot_atom_text(input)
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}
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// Missing obsolete
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fn id_right(input: &str) -> IResult<&str, &str> {
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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: &str) -> IResult<&str, &str> {
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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("<5678.21-Nov-1997@example.com>"),
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Ok(("", MessageId{left: "5678.21-Nov-1997", right: "example.com"})),
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);
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}
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}
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