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use std::borrow::Cow;
use std::fmt::{self, Debug, Display};
use std::str::FromStr;
use crate::Error;
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct HeaderName(Cow<'static, str>);
impl HeaderName {
pub fn from_ascii(mut bytes: Vec<u8>) -> Result<Self, Error> {
crate::ensure!(bytes.is_ascii(), "Bytes should be valid ASCII");
bytes.make_ascii_lowercase();
let string = unsafe { String::from_utf8_unchecked(bytes.to_vec()) };
Ok(HeaderName(Cow::Owned(string)))
}
pub fn as_str(&self) -> &'_ str {
&self.0
}
pub unsafe fn from_ascii_unchecked(mut bytes: Vec<u8>) -> Self {
bytes.make_ascii_lowercase();
let string = String::from_utf8_unchecked(bytes);
HeaderName(Cow::Owned(string))
}
pub(crate) const fn from_lowercase_str(str: &'static str) -> Self {
HeaderName(Cow::Borrowed(str))
}
}
impl Display for HeaderName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl FromStr for HeaderName {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
crate::ensure!(s.is_ascii(), "String slice should be valid ASCII");
Ok(HeaderName(Cow::Owned(s.to_ascii_lowercase())))
}
}
impl<'a> std::convert::TryFrom<&'a str> for HeaderName {
type Error = Error;
fn try_from(value: &'a str) -> Result<Self, Self::Error> {
Self::from_str(value)
}
}
impl PartialEq<str> for HeaderName {
fn eq(&self, other: &str) -> bool {
match HeaderName::from_str(other) {
Err(_) => false,
Ok(other) => self == &other,
}
}
}
impl<'a> PartialEq<&'a str> for HeaderName {
fn eq(&self, other: &&'a str) -> bool {
match HeaderName::from_str(other) {
Err(_) => false,
Ok(other) => self == &other,
}
}
}
impl PartialEq<String> for HeaderName {
fn eq(&self, other: &String) -> bool {
match HeaderName::from_str(&other) {
Err(_) => false,
Ok(other) => self == &other,
}
}
}
impl<'a> PartialEq<&String> for HeaderName {
fn eq(&self, other: &&String) -> bool {
match HeaderName::from_str(other) {
Err(_) => false,
Ok(other) => self == &other,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_header_name_static_non_static() {
let static_header = HeaderName::from_lowercase_str("hello");
let non_static_header = HeaderName::from_str("hello").unwrap();
assert_eq!(&static_header, &non_static_header);
assert_eq!(&static_header, &static_header);
assert_eq!(&non_static_header, &non_static_header);
assert_eq!(static_header, non_static_header);
assert_eq!(static_header, static_header);
assert_eq!(non_static_header, non_static_header);
}
#[test]
fn equality() {
let static_header = HeaderName::from_lowercase_str("hello");
assert_eq!(static_header, "hello");
assert_eq!(&static_header, "hello");
assert_eq!(static_header, String::from("hello"));
assert_eq!(static_header, &String::from("hello"));
assert_eq!(static_header, &String::from("Hello"));
}
}