Source code
Revision control
Copy as Markdown
Other Tools
use std::collections::BTreeMap;
use std::fmt;
use crate::value::Value;
use serde::de;
impl<'de> de::Deserialize<'de> for Value {
#[inline]
fn deserialize<D>(deserializer: D) -> Result<Value, D::Error>
where
D: de::Deserializer<'de>,
{
struct ValueVisitor;
impl<'de> de::Visitor<'de> for ValueVisitor {
type Value = Value;
fn expecting(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.write_str("any valid CBOR value")
}
#[inline]
fn visit_str<E>(self, value: &str) -> Result<Value, E>
where
E: de::Error,
{
self.visit_string(String::from(value))
}
#[inline]
fn visit_string<E>(self, value: String) -> Result<Value, E>
where
E: de::Error,
{
Ok(Value::Text(value))
}
#[inline]
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
self.visit_byte_buf(v.to_owned())
}
#[inline]
fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Bytes(v))
}
#[inline]
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Integer(v.into()))
}
#[inline]
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Integer(v.into()))
}
#[inline]
fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Integer(v))
}
#[inline]
fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Bool(v))
}
#[inline]
fn visit_none<E>(self) -> Result<Self::Value, E>
where
E: de::Error,
{
self.visit_unit()
}
#[inline]
fn visit_unit<E>(self) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Null)
}
#[inline]
fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
where
V: de::SeqAccess<'de>,
{
let mut vec = Vec::new();
while let Some(elem) = visitor.next_element()? {
vec.push(elem);
}
Ok(Value::Array(vec))
}
#[inline]
fn visit_map<V>(self, mut visitor: V) -> Result<Value, V::Error>
where
V: de::MapAccess<'de>,
{
let mut values = BTreeMap::new();
while let Some((key, value)) = visitor.next_entry()? {
values.insert(key, value);
}
Ok(Value::Map(values))
}
#[inline]
fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(Value::Float(v))
}
fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
where
D: serde::Deserializer<'de>,
{
let tag = crate::tags::get_tag();
let inner = deserializer.deserialize_any(self);
match tag {
Some(tag) => inner.map(|v| Value::Tag(tag, Box::new(v))),
None => inner,
}
}
}
deserializer.deserialize_any(ValueVisitor)
}
}
/// Convert a `serde_cbor::Value` into a type `T`
#[allow(clippy::needless_pass_by_value)]
pub fn from_value<T>(value: Value) -> Result<T, crate::error::Error>
where
T: de::DeserializeOwned,
{
// TODO implement in a way that doesn't require
// roundtrip through buffer (i.e. by implementing
// `serde::de::Deserializer` for `Value` and then doing
// `T::deserialize(value)`).
let buf = crate::to_vec(&value)?;
crate::from_slice(buf.as_slice())
}