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use HeaderValue;
// Derives an enum to represent content codings and some helpful impls
macro_rules! define_content_coding {
($($coding:ident; $str:expr,)+) => {
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
/// Values that are used with headers like [`Content-Encoding`](self::ContentEncoding) or
/// [`Accept-Encoding`](self::AcceptEncoding)
///
/// [RFC7231](https://www.iana.org/assignments/http-parameters/http-parameters.xhtml)
pub enum ContentCoding {
$(
#[doc = $str]
$coding,
)+
}
impl ContentCoding {
/// Returns a `&'static str` for a `ContentCoding`
///
/// # Example
///
/// ```
/// use headers::ContentCoding;
///
/// let coding = ContentCoding::BROTLI;
/// assert_eq!(coding.to_static(), "br");
/// ```
#[inline]
pub fn to_static(&self) -> &'static str {
match *self {
$(ContentCoding::$coding => $str,)+
}
}
/// Given a `&str` returns a `ContentCoding`
///
/// Note this will never fail, in the case of `&str` being an invalid content coding,
/// will return `ContentCoding::IDENTITY` because `'identity'` is generally always an
/// accepted coding.
///
/// # Example
///
/// ```
/// use headers::ContentCoding;
///
/// let invalid = ContentCoding::from_str("not a valid coding");
/// assert_eq!(invalid, ContentCoding::IDENTITY);
///
/// let valid = ContentCoding::from_str("gzip");
/// assert_eq!(valid, ContentCoding::GZIP);
/// ```
#[inline]
pub fn from_str(s: &str) -> Self {
ContentCoding::try_from_str(s).unwrap_or_else(|_| ContentCoding::IDENTITY)
}
/// Given a `&str` will try to return a `ContentCoding`
///
/// Different from `ContentCoding::from_str(&str)`, if `&str` is an invalid content
/// coding, it will return `Err(())`
///
/// # Example
///
/// ```
/// use headers::ContentCoding;
///
/// let invalid = ContentCoding::try_from_str("not a valid coding");
/// assert!(invalid.is_err());
///
/// let valid = ContentCoding::try_from_str("gzip");
/// assert_eq!(valid.unwrap(), ContentCoding::GZIP);
/// ```
#[inline]
pub fn try_from_str(s: &str) -> Result<Self, ()> {
match s {
$(
stringify!($coding)
| $str => Ok(ContentCoding::$coding),
)+
_ => Err(())
}
}
}
impl std::string::ToString for ContentCoding {
#[inline]
fn to_string(&self) -> String {
match *self {
$(ContentCoding::$coding => $str.to_string(),)+
}
}
}
impl From<ContentCoding> for HeaderValue {
fn from(coding: ContentCoding) -> HeaderValue {
match coding {
$(ContentCoding::$coding => HeaderValue::from_static($str),)+
}
}
}
}
}
define_content_coding! {
BROTLI; "br",
COMPRESS; "compress",
DEFLATE; "deflate",
GZIP; "gzip",
IDENTITY; "identity",
ZSTD; "zstd",
}
#[cfg(test)]
mod tests {
use super::ContentCoding;
#[test]
fn to_static() {
assert_eq!(ContentCoding::GZIP.to_static(), "gzip");
}
#[test]
fn to_string() {
assert_eq!(ContentCoding::DEFLATE.to_string(), "deflate".to_string());
}
#[test]
fn from_str() {
assert_eq!(ContentCoding::from_str("br"), ContentCoding::BROTLI);
assert_eq!(ContentCoding::from_str("GZIP"), ContentCoding::GZIP);
assert_eq!(ContentCoding::from_str("zstd"), ContentCoding::ZSTD);
assert_eq!(
ContentCoding::from_str("blah blah"),
ContentCoding::IDENTITY
);
}
#[test]
fn try_from_str() {
assert_eq!(ContentCoding::try_from_str("br"), Ok(ContentCoding::BROTLI));
assert_eq!(ContentCoding::try_from_str("zstd"), Ok(ContentCoding::ZSTD));
assert_eq!(ContentCoding::try_from_str("blah blah"), Err(()));
}
}