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use std::fmt;
use std::str;
use unicase;
use header::{Header, Raw};
/// 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
/// ```
/// use hyper::header::{Headers, Expect};
/// let mut headers = Headers::new();
/// headers.set(Expect::Continue);
/// ```
#[derive(Copy, Clone, PartialEq, Debug)]
pub enum Expect {
/// The value `100-continue`.
Continue
}
impl Header for Expect {
fn header_name() -> &'static str {
static NAME: &'static str = "Expect";
NAME
}
fn parse_header(raw: &Raw) -> ::Result<Expect> {
if let Some(line) = raw.one() {
let text = unsafe {
// safe because:
// 1. we don't actually care if it's utf8, we just want to
// compare the bytes with the "case" normalized. If it's not
// utf8, then the byte comparison will fail, and we'll return
// None. No big deal.
str::from_utf8_unchecked(line)
};
if unicase::eq_ascii(text, "100-continue") {
Ok(Expect::Continue)
} else {
Err(::Error::Header)
}
} else {
Err(::Error::Header)
}
}
fn fmt_header(&self, f: &mut ::header::Formatter) -> fmt::Result {
f.fmt_line(self)
}
}
impl fmt::Display for Expect {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("100-continue")
}
}