Struct Deserializer 

pub(crate) struct Deserializer<'de> {
    buf: &'de [u8],
    pos: usize,
    rec: usize,
    seq: usize,
}

Deserialization state.

Fields

buf: &'de [u8]

pos: usize

rec: usize

seq: usize

Implementations

impl<'de> Deserializer<'de>

const SEP: u8 = crate::ser::SEP

fn finished(&self) -> Result

Determine if the input was fully consumed and error if bytes remaining. This is intended for debug assertions; not optimized for parsing logic.

fn sequence_start(&mut self, len: usize)

Called at the start of arrays and tuples

fn record_ignore(&mut self)

Consume the current record to ignore it. Inside a sequence the next record is skipped but at the top-level all records are skipped such that deserialization completes with self.finished() == Ok.

fn record_ignore_all(&mut self)

Consume the current and all remaining records to ignore them. Similar to Ignore at the top-level, but it can be provided in a sequence to Ignore all remaining elements.

fn record_next(&mut self) -> &'de [u8]

Consume the current record. The position pointer is moved to the start of the next record. Slice of the current record is returned.

fn record_peek_byte(&self) -> Option<u8>

Peek at the first byte of the current record. If all records were consumed None is returned instead.

fn record_start(&mut self)

Consume the record separator such that the position cleanly points to the start of the next record. When input is exhausted but the sequence is not, advance no bytes; the caller deserializes from an empty slice. See next_element_seed for the additive-tail mechanic this enables.

fn record_trail(&mut self) -> &'de [u8]

Consume all remaining bytes, which may include record separators, returning a raw slice.

fn inc_pos(&mut self, n: usize)

Increment the position pointer.

fn inc_rec(&mut self, n: usize)

fn remaining(&self) -> Result<usize>

Unconsumed input bytes.

Trait Implementations

impl<'a, 'de: 'a> Deserializer<'de> for &'a mut Deserializer<'de>

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_tuple_struct<V>( self, _name: &'static str, len: usize, visitor: V, ) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_map<V>(self, visitor: V) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V, ) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V, ) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_newtype_struct<V>( self, name: &'static str, visitor: V, ) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_enum<V>( self, _name: &'static str, _variants: &'static [&'static str], _visitor: V, ) -> Result<V::Value>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn deserialize_option<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting an optional value.

fn deserialize_bool<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a bool value.

fn deserialize_i8<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_u8<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_f32<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_bytes<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_unit<V: Visitor<'de>>(self, _visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting a unit value.

fn deserialize_identifier<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_ignored_any<V: Visitor<'de>>( self, _visitor: V, ) -> Result<V::Value>

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn deserialize_any<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value>

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_i128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, Self::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl<'a, 'de: 'a> MapAccess<'de> for &'a mut Deserializer<'de>

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>>

where K: DeserializeSeed<'de>,

This returns Ok(Some(key)) for the next key in the map, or Ok(None) if there are no more remaining entries.

fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value>

where V: DeserializeSeed<'de>,

This returns a Ok(value) for the next value in the map.

fn next_entry_seed<K, V>( &mut self, kseed: K, vseed: V, ) -> Result<Option<(<K as DeserializeSeed<'de>>::Value, <V as DeserializeSeed<'de>>::Value)>, Self::Error>

where K: DeserializeSeed<'de>, V: DeserializeSeed<'de>,

This returns Ok(Some((key, value))) for the next (key-value) pair in the map, or Ok(None) if there are no more remaining items.

fn next_key<K>(&mut self) -> Result<Option<K>, Self::Error>

where K: Deserialize<'de>,

This returns Ok(Some(key)) for the next key in the map, or Ok(None) if there are no more remaining entries.

fn next_value<V>(&mut self) -> Result<V, Self::Error>

where V: Deserialize<'de>,

This returns a Ok(value) for the next value in the map.

fn next_entry<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error>

where K: Deserialize<'de>, V: Deserialize<'de>,

This returns Ok(Some((key, value))) for the next (key-value) pair in the map, or Ok(None) if there are no more remaining items.

fn size_hint(&self) -> Option<usize>

Returns the number of entries remaining in the map, if known.

impl<'a, 'de: 'a> SeqAccess<'de> for &'a mut Deserializer<'de>

type Error = Error

The error type that can be returned if some error occurs during deserialization.

fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>>

where T: DeserializeSeed<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error>

where T: Deserialize<'de>,

This returns Ok(Some(value)) for the next value in the sequence, or Ok(None) if there are no more remaining items.

fn size_hint(&self) -> Option<usize>

Returns the number of elements remaining in the sequence, if known.