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use std::{fmt::Display, str::FromStr};
macro_rules! header {
($hname:literal, struct $name:ident($type:ty)) => {
pub struct $name(pub $type);
impl Header for $name {
const NAME: &'static str = $hname;
}
impl Display for $name {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
impl FromStr for $name {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Ok($name(<$type>::from_str(s)?))
}
}
};
}
pub trait Header: FromStr<Err = anyhow::Error> + Display {
const NAME: &'static str;
}
header!("Content-Length", struct ContentLength(usize));
header!("Call-ID", struct CallID(String));
header!("CSeq", struct CSeq(String));
header!("Via", struct Via(String));
header!("Contact", struct Contact(String));
header!("Max-Forwards", struct MaxForwards(usize));
header!("From", struct From(String));
header!("To", struct To(String));
header!("User-Agent", struct UserAgent(String));
header!("Allow", struct Allow(String));
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