/
convert.rs
76 lines (64 loc) · 1.82 KB
/
convert.rs
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use crate::header::{HeaderMap, HeaderName, HeaderValue};
use crate::method::Method;
use crate::sealed::Sealed;
use crate::status::StatusCode;
use crate::uri::{Authority, PathAndQuery, Scheme, Uri};
use crate::Error;
/// Private trait for the `http` crate to have generic methods with fallible
/// conversions.
///
/// This trait is similar to the `TryFrom` trait proposed in the standard
/// library, except this is specialized for the `http` crate and isn't intended
/// for general consumption.
///
/// This trait cannot be implemented types outside of the `http` crate, and is
/// only intended for use as a generic bound on methods in the `http` crate.
pub trait HttpTryFrom<T>: Sized + Sealed {
/// Associated error with the conversion this implementation represents.
type Error: Into<Error>;
#[doc(hidden)]
fn try_from(t: T) -> Result<Self, Self::Error>;
}
pub(crate) trait HttpTryInto<T>: Sized {
fn http_try_into(self) -> Result<T, Error>;
}
#[doc(hidden)]
impl<T, U> HttpTryInto<U> for T
where
U: HttpTryFrom<T>,
T: Sized,
{
fn http_try_into(self) -> Result<U, Error> {
HttpTryFrom::try_from(self).map_err(|e: U::Error| e.into())
}
}
macro_rules! reflexive {
($($t:ty,)*) => ($(
impl HttpTryFrom<$t> for $t {
type Error = Error;
fn try_from(t: Self) -> Result<Self, Self::Error> {
Ok(t)
}
}
impl Sealed for $t {}
)*)
}
reflexive! {
Uri,
Method,
StatusCode,
HeaderMap,
HeaderName,
HeaderValue,
Scheme,
Authority,
PathAndQuery,
}
// HeaderMap<T> can't use reflexive easily due to the generic T
impl<T> HttpTryFrom<HeaderMap<T>> for HeaderMap<T> {
type Error = Error;
fn try_from(t: Self) -> Result<Self, Self::Error> {
Ok(t)
}
}
impl<T> Sealed for HeaderMap<T> {}