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new 0.11.0 | Mar 25, 2025 |
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0.9.4 | Jan 11, 2024 |
0.9.3 | Dec 23, 2022 |
0.9.2 | Jan 31, 2022 |
0.3.0 | Jul 24, 2020 |
#87 in Parser implementations
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Used in 33 crates
(7 directly)
160KB
4K
SLoC
Structured Field Values for HTTP
sfv
is an implementation of Structured Field Values for HTTP as specified in RFC 9651 for parsing and serializing HTTP field values (also known as "structured headers" or "structured trailers").
It also exposes a set of types that might be useful for defining new structured fields.
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.
lib.rs
:
sfv
is an implementation of Structured Field Values for HTTP, as specified in RFC 9651 for parsing and serializing HTTP field values.
It also exposes a set of types that might be useful for defining new structured fields.
Data Structures
There are three types of structured fields:
Item
-- anInteger
,Decimal
,String
,Token
,Byte Sequence
,Boolean
,Date
, orDisplay String
. It can have associatedParameters
.List
-- an array of zero or more members, each of which can be anItem
or anInnerList
, both of which can haveParameters
.Dictionary
-- an ordered map of name-value pairs, where the names are short textual strings and the values areItem
s or arrays ofItems
(represented withInnerList
), both of which can have associated parameters. There can be zero or more members, and their names are unique in the scope of theDictionary
they occur within.
There are also a few lower-level types used to construct structured field values:
BareItem
is used asItem
's value or as a parameter value inParameters
.Parameters
are an ordered map of key-value pairs that are associated with anItem
orInnerList
. The keys are unique within the scope theParameters
they occur within, and the values areBareItem
.InnerList
is an array of zero or moreItems
. Can have associatedParameters
.ListEntry
represents eitherItem
orInnerList
as a member ofList
or as member-value inDictionary
.
Examples
Serialization
Serializes an Item
:
use sfv::{Decimal, ItemSerializer, KeyRef, StringRef};
let serialized_item = ItemSerializer::new()
.bare_item(StringRef::from_str("foo")?)
.parameter(KeyRef::from_str("key")?, Decimal::try_from(13.45655)?)
.finish();
assert_eq!(serialized_item, r#""foo";key=13.457"#);
Serializes a List
:
use sfv::{KeyRef, ListSerializer, StringRef, TokenRef};
let mut ser = ListSerializer::new();
ser.bare_item(TokenRef::from_str("tok")?);
{
let mut ser = ser.inner_list();
ser.bare_item(99).parameter(KeyRef::from_str("key")?, false);
ser.bare_item(StringRef::from_str("foo")?);
ser.finish().parameter(KeyRef::from_str("bar")?, true);
}
let serialized_list = ser.finish()?;
assert_eq!(
serialized_list,
r#"tok, (99;key=?0 "foo");bar"#
);
Serializes a Dictionary
:
use sfv::{DictSerializer, KeyRef, StringRef};
let mut ser = DictSerializer::new();
ser.bare_item(KeyRef::from_str("key1")?, StringRef::from_str("apple")?);
ser.bare_item(KeyRef::from_str("key2")?, true);
ser.bare_item(KeyRef::from_str("key3")?, false);
let serialized_dict = ser.finish()?;
assert_eq!(
serialized_dict,
r#"key1="apple", key2, key3=?0"#
);
Crate features
-
parsed-types
(enabled by default) -- When enabled, exposes fully owned typesItem
,Dictionary
,List
, and their components, which can be obtained fromParser::parse_item
, etc. These types are implemented using theindexmap
crate, so disabling this feature can avoid that dependency if parsing using a visitor (Parser::parse_item_with_visitor
, etc.) is sufficient. -
arbitrary
-- Implements theArbitrary
trait for this crate's types, making them easier to use with fuzzing.
Dependencies
~0.4–1MB
~23K SLoC