use super::DecodeError as SerdeDecodeError;
use crate::{
config::Config,
de::{BorrowDecode, BorrowDecoder, Decode},
error::DecodeError,
};
use core::marker::PhantomData;
use serde::de::*;
pub fn decode_borrowed_from_slice<'de, T, C>(slice: &'de [u8], config: C) -> Result<T, DecodeError>
where
T: Deserialize<'de>,
C: Config,
{
if C::SKIP_FIXED_ARRAY_LENGTH {
return Err(SerdeDecodeError::SkipFixedArrayLengthNotSupported.into());
}
let reader = crate::de::read::SliceReader::new(slice);
let mut decoder = crate::de::DecoderImpl::new(reader, config);
let serde_decoder = SerdeDecoder {
de: &mut decoder,
pd: PhantomData,
};
T::deserialize(serde_decoder)
}
pub fn decode_seed_from_slice<'de, T, C>(
seed: T,
slice: &'de [u8],
config: C,
) -> Result<T::Value, DecodeError>
where
T: DeserializeSeed<'de>,
C: Config,
{
if C::SKIP_FIXED_ARRAY_LENGTH {
return Err(SerdeDecodeError::SkipFixedArrayLengthNotSupported.into());
}
let reader = crate::de::read::SliceReader::new(slice);
let mut decoder = crate::de::DecoderImpl::new(reader, config);
let serde_decoder = SerdeDecoder {
de: &mut decoder,
pd: PhantomData,
};
seed.deserialize(serde_decoder)
}
pub(super) struct SerdeDecoder<'a, 'de, DE: BorrowDecoder<'de>> {
pub(super) de: &'a mut DE,
pub(super) pd: PhantomData<&'de ()>,
}
impl<'a, 'de, DE: BorrowDecoder<'de>> Deserializer<'de> for SerdeDecoder<'a, 'de, DE> {
type Error = DecodeError;
fn deserialize_any<V>(self, _: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
Err(SerdeDecodeError::AnyNotSupported.into())
}
fn deserialize_bool<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_bool(Decode::decode(&mut self.de)?)
}
fn deserialize_i8<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_i8(Decode::decode(&mut self.de)?)
}
fn deserialize_i16<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_i16(Decode::decode(&mut self.de)?)
}
fn deserialize_i32<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_i32(Decode::decode(&mut self.de)?)
}
fn deserialize_i64<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_i64(Decode::decode(&mut self.de)?)
}
serde::serde_if_integer128! {
fn deserialize_i128<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_i128(Decode::decode(&mut self.de)?)
}
}
fn deserialize_u8<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_u8(Decode::decode(&mut self.de)?)
}
fn deserialize_u16<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_u16(Decode::decode(&mut self.de)?)
}
fn deserialize_u32<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_u32(Decode::decode(&mut self.de)?)
}
fn deserialize_u64<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_u64(Decode::decode(&mut self.de)?)
}
serde::serde_if_integer128! {
fn deserialize_u128<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_u128(Decode::decode(&mut self.de)?)
}
}
fn deserialize_f32<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_f32(Decode::decode(&mut self.de)?)
}
fn deserialize_f64<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_f64(Decode::decode(&mut self.de)?)
}
fn deserialize_char<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_char(Decode::decode(&mut self.de)?)
}
fn deserialize_str<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
let str = <&'de str>::borrow_decode(&mut self.de)?;
visitor.visit_borrowed_str(str)
}
#[cfg(not(feature = "alloc"))]
fn deserialize_string<V>(self, _: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
Err(SerdeDecodeError::CannotBorrowOwnedData.into())
}
#[cfg(feature = "alloc")]
fn deserialize_string<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_string(Decode::decode(&mut self.de)?)
}
fn deserialize_bytes<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
let bytes = <&'de [u8]>::borrow_decode(&mut self.de)?;
visitor.visit_borrowed_bytes(bytes)
}
#[cfg(not(feature = "alloc"))]
fn deserialize_byte_buf<V>(self, _: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
Err(SerdeDecodeError::CannotBorrowOwnedData.into())
}
#[cfg(feature = "alloc")]
fn deserialize_byte_buf<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_byte_buf(Decode::decode(&mut self.de)?)
}
fn deserialize_option<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
let variant = crate::de::decode_option_variant(&mut self.de, "Option<T>")?;
if variant.is_some() {
visitor.visit_some(self)
} else {
visitor.visit_none()
}
}
fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_unit()
}
fn deserialize_unit_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_unit()
}
fn deserialize_newtype_struct<V>(
self,
_name: &'static str,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_newtype_struct(self)
}
fn deserialize_seq<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
let len = usize::decode(&mut self.de)?;
self.deserialize_tuple(len, visitor)
}
fn deserialize_tuple<V>(mut self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
struct Access<'a, 'b, 'de, DE: BorrowDecoder<'de>> {
deserializer: &'a mut SerdeDecoder<'b, 'de, DE>,
len: usize,
}
impl<'de, 'a, 'b: 'a, DE: BorrowDecoder<'de> + 'b> SeqAccess<'de> for Access<'a, 'b, 'de, DE> {
type Error = DecodeError;
fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, DecodeError>
where
T: DeserializeSeed<'de>,
{
if self.len > 0 {
self.len -= 1;
let value = DeserializeSeed::deserialize(
seed,
SerdeDecoder {
de: self.deserializer.de,
pd: PhantomData,
},
)?;
Ok(Some(value))
} else {
Ok(None)
}
}
fn size_hint(&self) -> Option<usize> {
Some(self.len)
}
}
visitor.visit_seq(Access {
deserializer: &mut self,
len,
})
}
fn deserialize_tuple_struct<V>(
self,
_name: &'static str,
len: usize,
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
self.deserialize_tuple(len, visitor)
}
fn deserialize_map<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
struct Access<'a, 'b, 'de, DE: BorrowDecoder<'de>> {
deserializer: &'a mut SerdeDecoder<'b, 'de, DE>,
len: usize,
}
impl<'de, 'a, 'b: 'a, DE: BorrowDecoder<'de> + 'b> MapAccess<'de> for Access<'a, 'b, 'de, DE> {
type Error = DecodeError;
fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, DecodeError>
where
K: DeserializeSeed<'de>,
{
if self.len > 0 {
self.len -= 1;
let key = DeserializeSeed::deserialize(
seed,
SerdeDecoder {
de: self.deserializer.de,
pd: PhantomData,
},
)?;
Ok(Some(key))
} else {
Ok(None)
}
}
fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, DecodeError>
where
V: DeserializeSeed<'de>,
{
let value = DeserializeSeed::deserialize(
seed,
SerdeDecoder {
de: self.deserializer.de,
pd: PhantomData,
},
)?;
Ok(value)
}
fn size_hint(&self) -> Option<usize> {
Some(self.len)
}
}
let len = usize::decode(&mut self.de)?;
visitor.visit_map(Access {
deserializer: &mut self,
len,
})
}
fn deserialize_struct<V>(
self,
_name: &'static str,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
self.deserialize_tuple(fields.len(), visitor)
}
fn deserialize_enum<V>(
self,
_name: &'static str,
_variants: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
visitor.visit_enum(self)
}
fn deserialize_identifier<V>(self, _visitor: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
Err(SerdeDecodeError::IdentifierNotSupported.into())
}
fn deserialize_ignored_any<V>(self, _: V) -> Result<V::Value, Self::Error>
where
V: serde::de::Visitor<'de>,
{
Err(SerdeDecodeError::IgnoredAnyNotSupported.into())
}
fn is_human_readable(&self) -> bool {
false
}
}
impl<'de, 'a, DE: BorrowDecoder<'de>> EnumAccess<'de> for SerdeDecoder<'a, 'de, DE> {
type Error = DecodeError;
type Variant = Self;
fn variant_seed<V>(mut self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error>
where
V: DeserializeSeed<'de>,
{
let idx = u32::decode(&mut self.de)?;
let val = seed.deserialize(idx.into_deserializer())?;
Ok((val, self))
}
}
impl<'de, 'a, DE: BorrowDecoder<'de>> VariantAccess<'de> for SerdeDecoder<'a, 'de, DE> {
type Error = DecodeError;
fn unit_variant(self) -> Result<(), Self::Error> {
Ok(())
}
fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Self::Error>
where
T: DeserializeSeed<'de>,
{
DeserializeSeed::deserialize(seed, self)
}
fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
Deserializer::deserialize_tuple(self, len, visitor)
}
fn struct_variant<V>(
self,
fields: &'static [&'static str],
visitor: V,
) -> Result<V::Value, Self::Error>
where
V: Visitor<'de>,
{
Deserializer::deserialize_tuple(self, fields.len(), visitor)
}
}