headers/util/
mod.rs

1use http::HeaderValue;
2
3use crate::Error;
4
5//pub use self::charset::Charset;
6//pub use self::encoding::Encoding;
7pub(crate) use self::entity::{EntityTag, EntityTagRange};
8pub(crate) use self::flat_csv::{FlatCsv, SemiColon};
9pub(crate) use self::fmt::fmt;
10pub(crate) use self::http_date::HttpDate;
11pub(crate) use self::iter::IterExt;
12//pub use language_tags::LanguageTag;
13//pub use self::quality_value::{Quality, QualityValue};
14pub(crate) use self::seconds::Seconds;
15pub(crate) use self::value_string::HeaderValueString;
16
17//mod charset;
18pub(crate) mod csv;
19//mod encoding;
20mod entity;
21mod flat_csv;
22mod fmt;
23mod http_date;
24mod iter;
25//mod quality_value;
26mod seconds;
27mod value_string;
28
29macro_rules! error_type {
30    ($name:ident) => {
31        #[doc(hidden)]
32        pub struct $name {
33            _inner: (),
34        }
35
36        impl ::std::fmt::Debug for $name {
37            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
38                f.debug_struct(stringify!($name)).finish()
39            }
40        }
41
42        impl ::std::fmt::Display for $name {
43            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
44                f.write_str(stringify!($name))
45            }
46        }
47
48        impl ::std::error::Error for $name {}
49    };
50}
51
52macro_rules! derive_header {
53    ($type:ident(_), name: $name:ident) => {
54        impl crate::Header for $type {
55            fn name() -> &'static ::http::header::HeaderName {
56                &::http::header::$name
57            }
58
59            fn decode<'i, I>(values: &mut I) -> Result<Self, crate::Error>
60            where
61                I: Iterator<Item = &'i ::http::header::HeaderValue>,
62            {
63                crate::util::TryFromValues::try_from_values(values).map($type)
64            }
65
66            fn encode<E: Extend<crate::HeaderValue>>(&self, values: &mut E) {
67                values.extend(::std::iter::once((&self.0).into()));
68            }
69        }
70    };
71}
72
73/// A helper trait for use when deriving `Header`.
74pub(crate) trait TryFromValues: Sized {
75    /// Try to convert from the values into an instance of `Self`.
76    fn try_from_values<'i, I>(values: &mut I) -> Result<Self, Error>
77    where
78        Self: Sized,
79        I: Iterator<Item = &'i HeaderValue>;
80}
81
82impl TryFromValues for HeaderValue {
83    fn try_from_values<'i, I>(values: &mut I) -> Result<Self, Error>
84    where
85        I: Iterator<Item = &'i HeaderValue>,
86    {
87        values.next().cloned().ok_or_else(Error::invalid)
88    }
89}
headers/util/mod.rs

headers/util/
mod.rs
