82 lines
2 KiB
Rust
82 lines
2 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 crate::error::IMFError;
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use crate::fragments::lazy;
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use crate::fragments::mailbox::is_dtext;
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use crate::fragments::model::{MessageId, MessageIdList};
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use crate::fragments::whitespace::cfws;
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use crate::fragments::words::dot_atom_text;
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impl<'a> TryFrom<&'a lazy::Identifier<'a>> for MessageId<'a> {
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type Error = IMFError<'a>;
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fn try_from(id: &'a lazy::Identifier<'a>) -> Result<Self, Self::Error> {
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msg_id(id.0)
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.map(|(_, i)| i)
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.map_err(|e| IMFError::MessageID(e))
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}
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}
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impl<'a> TryFrom<&'a lazy::IdentifierList<'a>> for MessageIdList<'a> {
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type Error = IMFError<'a>;
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fn try_from(id: &'a lazy::IdentifierList<'a>) -> Result<Self, Self::Error> {
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many1(msg_id)(id.0)
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.map(|(_, i)| i)
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.map_err(|e| IMFError::MessageIDList(e))
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}
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}
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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((
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"",
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MessageId {
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left: "5678.21-Nov-1997",
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right: "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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