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//! Deserialization support for the `application/x-www-form-urlencoded` format.
use serde::de;
#[doc(inline)]
pub use serde::de::value::Error;
use serde::de::value::MapDeserializer;
use std::io::Read;
use url::form_urlencoded::Parse as UrlEncodedParse;
use url::form_urlencoded::parse;
/// Deserializes a `application/x-wwww-url-encoded` value from a `&[u8]`.
///
/// ```
/// let meal = vec![
/// ("bread".to_owned(), "baguette".to_owned()),
/// ("cheese".to_owned(), "comté".to_owned()),
/// ("meat".to_owned(), "ham".to_owned()),
/// ("fat".to_owned(), "butter".to_owned()),
/// ];
///
/// assert_eq!(
/// serde_urlencoded::from_bytes::<Vec<(String, String)>>(
/// b"bread=baguette&cheese=comt%C3%A9&meat=ham&fat=butter"),
/// Ok(meal));
/// ```
pub fn from_bytes<T: de::Deserialize>(input: &[u8]) -> Result<T, Error> {
T::deserialize(Deserializer::new(parse(input)))
}
/// Deserializes a `application/x-wwww-url-encoded` value from a `&str`.
///
/// ```
/// let meal = vec![
/// ("bread".to_owned(), "baguette".to_owned()),
/// ("cheese".to_owned(), "comté".to_owned()),
/// ("meat".to_owned(), "ham".to_owned()),
/// ("fat".to_owned(), "butter".to_owned()),
/// ];
///
/// assert_eq!(
/// serde_urlencoded::from_str::<Vec<(String, String)>>(
/// "bread=baguette&cheese=comt%C3%A9&meat=ham&fat=butter"),
/// Ok(meal));
/// ```
pub fn from_str<T: de::Deserialize>(input: &str) -> Result<T, Error> {
from_bytes(input.as_bytes())
}
/// Convenience function that reads all bytes from `reader` and deserializes
/// them with `from_bytes`.
pub fn from_reader<T, R>(mut reader: R) -> Result<T, Error>
where T: de::Deserialize, R: Read
{
let mut buf = vec![];
reader.read_to_end(&mut buf)
.map_err(|e| {
de::Error::custom(format_args!("could not read input: {}", e))
})?;
from_bytes(&buf)
}
/// A deserializer for the `application/x-www-form-urlencoded` format.
///
/// * Supported top-level outputs are structs, maps and sequences of pairs,
/// with or without a given length.
///
/// * Main `deserialize` methods defers to `deserialize_map`.
///
/// * Everything else but `deserialize_seq` and `deserialize_seq_fixed_size`
/// defers to `deserialize`.
pub struct Deserializer<'a> {
inner: MapDeserializer<UrlEncodedParse<'a>, Error>,
}
impl<'a> Deserializer<'a> {
/// Returns a new `Deserializer`.
pub fn new(parser: UrlEncodedParse<'a>) -> Self {
Deserializer { inner: MapDeserializer::new(parser) }
}
}
impl<'a> de::Deserializer for Deserializer<'a> {
type Error = Error;
fn deserialize<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where V: de::Visitor,
{
self.deserialize_map(visitor)
}
fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where V: de::Visitor,
{
visitor.visit_map(self.inner)
}
fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where V: de::Visitor,
{
visitor.visit_seq(self.inner)
}
fn deserialize_seq_fixed_size<V>(self,
_len: usize,
visitor: V)
-> Result<V::Value, Self::Error>
where V: de::Visitor,
{
visitor.visit_seq(self.inner)
}
forward_to_deserialize! {
bool
u8
u16
u32
u64
i8
i16
i32
i64
f32
f64
char
str
string
unit
option
bytes
byte_buf
unit_struct
newtype_struct
tuple_struct
struct
struct_field
tuple
enum
ignored_any
}
}
|
