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use std::fmt;
/// The `Expect` header.
///
/// > The "Expect" header field in a request indicates a certain set of
/// > behaviors (expectations) that need to be supported by the server in
/// > order to properly handle this request. The only such expectation
/// > defined by this specification is 100-continue.
/// >
/// > Expect = "100-continue"
///
/// # Example
///
/// ```
/// # extern crate headers_ext as headers;
/// use headers::Expect;
///
/// let expect = Expect::CONTINUE;
/// ```
#[derive(Clone, PartialEq)]
pub struct Expect(());
impl Expect {
/// "100-continue"
pub const CONTINUE: Expect = Expect(());
}
impl ::Header for Expect {
const NAME: &'static ::HeaderName = &::http::header::EXPECT;
fn decode(values: &mut ::Values) -> Option<Expect> {
if values.next()? == "100-continue" {
Some(Expect::CONTINUE)
} else {
None
}
}
fn encode(&self, values: &mut ::ToValues) {
values.append(::HeaderValue::from_static("100-continue"));
}
}
impl fmt::Debug for Expect {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("Expect")
.field(&"100-continue")
.finish()
}
}
#[cfg(test)]
mod tests {
use super::Expect;
use super::super::test_decode;
#[test]
fn expect_continue() {
assert_eq!(
test_decode::<Expect>(&["100-continue"]),
Some(Expect::CONTINUE),
);
}
#[test]
fn expectation_failed() {
assert_eq!(
test_decode::<Expect>(&["sandwich"]),
None,
);
}
#[test]
fn too_many_values() {
assert_eq!(
test_decode::<Expect>(&["100-continue", "100-continue"]),
None,
);
}
}