diff options
Diffstat (limited to 'vendor/serde/src/de')
| -rw-r--r-- | vendor/serde/src/de/format.rs | 30 | ||||
| -rw-r--r-- | vendor/serde/src/de/ignored_any.rs | 238 | ||||
| -rw-r--r-- | vendor/serde/src/de/impls.rs | 3071 | ||||
| -rw-r--r-- | vendor/serde/src/de/mod.rs | 2292 | ||||
| -rw-r--r-- | vendor/serde/src/de/seed.rs | 19 | ||||
| -rw-r--r-- | vendor/serde/src/de/size_hint.rs | 29 | ||||
| -rw-r--r-- | vendor/serde/src/de/value.rs | 1720 |
7 files changed, 0 insertions, 7399 deletions
diff --git a/vendor/serde/src/de/format.rs b/vendor/serde/src/de/format.rs deleted file mode 100644 index 9053cc0..0000000 --- a/vendor/serde/src/de/format.rs +++ /dev/null @@ -1,30 +0,0 @@ -use crate::lib::fmt::{self, Write}; -use crate::lib::str; - -pub(super) struct Buf<'a> { - bytes: &'a mut [u8], - offset: usize, -} - -impl<'a> Buf<'a> { - pub fn new(bytes: &'a mut [u8]) -> Self { - Buf { bytes, offset: 0 } - } - - pub fn as_str(&self) -> &str { - let slice = &self.bytes[..self.offset]; - unsafe { str::from_utf8_unchecked(slice) } - } -} - -impl<'a> Write for Buf<'a> { - fn write_str(&mut self, s: &str) -> fmt::Result { - if self.offset + s.len() > self.bytes.len() { - Err(fmt::Error) - } else { - self.bytes[self.offset..self.offset + s.len()].copy_from_slice(s.as_bytes()); - self.offset += s.len(); - Ok(()) - } - } -} diff --git a/vendor/serde/src/de/ignored_any.rs b/vendor/serde/src/de/ignored_any.rs deleted file mode 100644 index 2360a17..0000000 --- a/vendor/serde/src/de/ignored_any.rs +++ /dev/null @@ -1,238 +0,0 @@ -use crate::lib::*; - -use crate::de::{ - Deserialize, Deserializer, EnumAccess, Error, MapAccess, SeqAccess, VariantAccess, Visitor, -}; - -/// An efficient way of discarding data from a deserializer. -/// -/// Think of this like `serde_json::Value` in that it can be deserialized from -/// any type, except that it does not store any information about the data that -/// gets deserialized. -/// -/// ```edition2021 -/// use serde::de::{ -/// self, Deserialize, DeserializeSeed, Deserializer, IgnoredAny, SeqAccess, Visitor, -/// }; -/// use std::fmt; -/// use std::marker::PhantomData; -/// -/// /// A seed that can be used to deserialize only the `n`th element of a sequence -/// /// while efficiently discarding elements of any type before or after index `n`. -/// /// -/// /// For example to deserialize only the element at index 3: -/// /// -/// /// ``` -/// /// NthElement::new(3).deserialize(deserializer) -/// /// ``` -/// pub struct NthElement<T> { -/// n: usize, -/// marker: PhantomData<T>, -/// } -/// -/// impl<T> NthElement<T> { -/// pub fn new(n: usize) -> Self { -/// NthElement { -/// n: n, -/// marker: PhantomData, -/// } -/// } -/// } -/// -/// impl<'de, T> Visitor<'de> for NthElement<T> -/// where -/// T: Deserialize<'de>, -/// { -/// type Value = T; -/// -/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// write!( -/// formatter, -/// "a sequence in which we care about element {}", -/// self.n -/// ) -/// } -/// -/// fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> -/// where -/// A: SeqAccess<'de>, -/// { -/// // Skip over the first `n` elements. -/// for i in 0..self.n { -/// // It is an error if the sequence ends before we get to element `n`. -/// if seq.next_element::<IgnoredAny>()?.is_none() { -/// return Err(de::Error::invalid_length(i, &self)); -/// } -/// } -/// -/// // Deserialize the one we care about. -/// let nth = match seq.next_element()? { -/// Some(nth) => nth, -/// None => { -/// return Err(de::Error::invalid_length(self.n, &self)); -/// } -/// }; -/// -/// // Skip over any remaining elements in the sequence after `n`. -/// while let Some(IgnoredAny) = seq.next_element()? { -/// // ignore -/// } -/// -/// Ok(nth) -/// } -/// } -/// -/// impl<'de, T> DeserializeSeed<'de> for NthElement<T> -/// where -/// T: Deserialize<'de>, -/// { -/// type Value = T; -/// -/// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> -/// where -/// D: Deserializer<'de>, -/// { -/// deserializer.deserialize_seq(self) -/// } -/// } -/// -/// # fn example<'de, D>(deserializer: D) -> Result<(), D::Error> -/// # where -/// # D: Deserializer<'de>, -/// # { -/// // Deserialize only the sequence element at index 3 from this deserializer. -/// // The element at index 3 is required to be a string. Elements before and -/// // after index 3 are allowed to be of any type. -/// let s: String = NthElement::new(3).deserialize(deserializer)?; -/// # Ok(()) -/// # } -/// ``` -#[derive(Copy, Clone, Debug, Default, PartialEq)] -pub struct IgnoredAny; - -impl<'de> Visitor<'de> for IgnoredAny { - type Value = IgnoredAny; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("anything at all") - } - - #[inline] - fn visit_bool<E>(self, x: bool) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_i64<E>(self, x: i64) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_i128<E>(self, x: i128) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_u64<E>(self, x: u64) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_u128<E>(self, x: u128) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_f64<E>(self, x: f64) -> Result<Self::Value, E> { - let _ = x; - Ok(IgnoredAny) - } - - #[inline] - fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> - where - E: Error, - { - let _ = s; - Ok(IgnoredAny) - } - - #[inline] - fn visit_none<E>(self) -> Result<Self::Value, E> { - Ok(IgnoredAny) - } - - #[inline] - fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - IgnoredAny::deserialize(deserializer) - } - - #[inline] - fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - IgnoredAny::deserialize(deserializer) - } - - #[inline] - fn visit_unit<E>(self) -> Result<Self::Value, E> { - Ok(IgnoredAny) - } - - #[inline] - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - while let Some(IgnoredAny) = tri!(seq.next_element()) { - // Gobble - } - Ok(IgnoredAny) - } - - #[inline] - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - while let Some((IgnoredAny, IgnoredAny)) = tri!(map.next_entry()) { - // Gobble - } - Ok(IgnoredAny) - } - - #[inline] - fn visit_bytes<E>(self, bytes: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - let _ = bytes; - Ok(IgnoredAny) - } - - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - tri!(data.variant::<IgnoredAny>()).1.newtype_variant() - } -} - -impl<'de> Deserialize<'de> for IgnoredAny { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<IgnoredAny, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_ignored_any(IgnoredAny) - } -} diff --git a/vendor/serde/src/de/impls.rs b/vendor/serde/src/de/impls.rs deleted file mode 100644 index 413c997..0000000 --- a/vendor/serde/src/de/impls.rs +++ /dev/null @@ -1,3071 +0,0 @@ -use crate::lib::*; - -use crate::de::{ - Deserialize, Deserializer, EnumAccess, Error, MapAccess, SeqAccess, Unexpected, VariantAccess, - Visitor, -}; - -use crate::seed::InPlaceSeed; - -#[cfg(any(feature = "std", feature = "alloc"))] -use crate::de::size_hint; - -//////////////////////////////////////////////////////////////////////////////// - -struct UnitVisitor; - -impl<'de> Visitor<'de> for UnitVisitor { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("unit") - } - - fn visit_unit<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Ok(()) - } -} - -impl<'de> Deserialize<'de> for () { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_unit(UnitVisitor) - } -} - -#[cfg(feature = "unstable")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "unstable")))] -impl<'de> Deserialize<'de> for ! { - fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - Err(Error::custom("cannot deserialize `!`")) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -struct BoolVisitor; - -impl<'de> Visitor<'de> for BoolVisitor { - type Value = bool; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a boolean") - } - - fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) - } -} - -impl<'de> Deserialize<'de> for bool { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_bool(BoolVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! impl_deserialize_num { - ($primitive:ident, $nonzero:ident $(cfg($($cfg:tt)*))*, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { - impl_deserialize_num!($primitive, $deserialize $($method!($($val : $visit)*);)*); - - $(#[cfg($($cfg)*)])* - impl<'de> Deserialize<'de> for num::$nonzero { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct NonZeroVisitor; - - impl<'de> Visitor<'de> for NonZeroVisitor { - type Value = num::$nonzero; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("a nonzero ", stringify!($primitive))) - } - - $($($method!(nonzero $primitive $val : $visit);)*)* - } - - deserializer.$deserialize(NonZeroVisitor) - } - } - }; - - ($primitive:ident, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => { - impl<'de> Deserialize<'de> for $primitive { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct PrimitiveVisitor; - - impl<'de> Visitor<'de> for PrimitiveVisitor { - type Value = $primitive; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(stringify!($primitive)) - } - - $($($method!($val : $visit);)*)* - } - - deserializer.$deserialize(PrimitiveVisitor) - } - } - }; -} - -macro_rules! num_self { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if let Some(nonzero) = Self::Value::new(v) { - Ok(nonzero) - } else { - Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) - } - } - }; -} - -macro_rules! num_as_self { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v as Self::Value) - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if let Some(nonzero) = Self::Value::new(v as $primitive) { - Ok(nonzero) - } else { - Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) - } - } - }; -} - -macro_rules! num_as_copysign_self { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - #[cfg(any(no_float_copysign, not(feature = "std")))] - { - Ok(v as Self::Value) - } - - #[cfg(all(not(no_float_copysign), feature = "std"))] - { - // Preserve sign of NaN. The `as` produces a nondeterministic sign. - let sign = if v.is_sign_positive() { 1.0 } else { -1.0 }; - Ok((v as Self::Value).copysign(sign)) - } - } - }; -} - -macro_rules! int_to_int { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if Self::Value::min_value() as i64 <= v as i64 - && v as i64 <= Self::Value::max_value() as i64 - { - Ok(v as Self::Value) - } else { - Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) - } - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if $primitive::min_value() as i64 <= v as i64 - && v as i64 <= $primitive::max_value() as i64 - { - if let Some(nonzero) = Self::Value::new(v as $primitive) { - return Ok(nonzero); - } - } - Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) - } - }; -} - -macro_rules! int_to_uint { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if 0 <= v && v as u64 <= Self::Value::max_value() as u64 { - Ok(v as Self::Value) - } else { - Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) - } - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if 0 < v && v as u64 <= $primitive::max_value() as u64 { - if let Some(nonzero) = Self::Value::new(v as $primitive) { - return Ok(nonzero); - } - } - Err(Error::invalid_value(Unexpected::Signed(v as i64), &self)) - } - }; -} - -macro_rules! uint_to_self { - ($ty:ident : $visit:ident) => { - #[inline] - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if v as u64 <= Self::Value::max_value() as u64 { - Ok(v as Self::Value) - } else { - Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self)) - } - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if v as u64 <= $primitive::max_value() as u64 { - if let Some(nonzero) = Self::Value::new(v as $primitive) { - return Ok(nonzero); - } - } - Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self)) - } - }; -} - -impl_deserialize_num! { - i8, NonZeroI8 cfg(not(no_num_nonzero_signed)), deserialize_i8 - num_self!(i8:visit_i8); - int_to_int!(i16:visit_i16 i32:visit_i32 i64:visit_i64); - uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - i16, NonZeroI16 cfg(not(no_num_nonzero_signed)), deserialize_i16 - num_self!(i16:visit_i16); - num_as_self!(i8:visit_i8); - int_to_int!(i32:visit_i32 i64:visit_i64); - uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - i32, NonZeroI32 cfg(not(no_num_nonzero_signed)), deserialize_i32 - num_self!(i32:visit_i32); - num_as_self!(i8:visit_i8 i16:visit_i16); - int_to_int!(i64:visit_i64); - uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - i64, NonZeroI64 cfg(not(no_num_nonzero_signed)), deserialize_i64 - num_self!(i64:visit_i64); - num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32); - uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - isize, NonZeroIsize cfg(not(no_num_nonzero_signed)), deserialize_i64 - num_as_self!(i8:visit_i8 i16:visit_i16); - int_to_int!(i32:visit_i32 i64:visit_i64); - uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - u8, NonZeroU8, deserialize_u8 - num_self!(u8:visit_u8); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - uint_to_self!(u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - u16, NonZeroU16, deserialize_u16 - num_self!(u16:visit_u16); - num_as_self!(u8:visit_u8); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - uint_to_self!(u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - u32, NonZeroU32, deserialize_u32 - num_self!(u32:visit_u32); - num_as_self!(u8:visit_u8 u16:visit_u16); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - uint_to_self!(u64:visit_u64); -} - -impl_deserialize_num! { - u64, NonZeroU64, deserialize_u64 - num_self!(u64:visit_u64); - num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); -} - -impl_deserialize_num! { - usize, NonZeroUsize, deserialize_u64 - num_as_self!(u8:visit_u8 u16:visit_u16); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - uint_to_self!(u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - f32, deserialize_f32 - num_self!(f32:visit_f32); - num_as_copysign_self!(f64:visit_f64); - num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -impl_deserialize_num! { - f64, deserialize_f64 - num_self!(f64:visit_f64); - num_as_copysign_self!(f32:visit_f32); - num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); -} - -macro_rules! num_128 { - ($ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if v as i128 >= Self::Value::min_value() as i128 - && v as u128 <= Self::Value::max_value() as u128 - { - Ok(v as Self::Value) - } else { - Err(Error::invalid_value( - Unexpected::Other(stringify!($ty)), - &self, - )) - } - } - }; - - (nonzero $primitive:ident $ty:ident : $visit:ident) => { - fn $visit<E>(self, v: $ty) -> Result<Self::Value, E> - where - E: Error, - { - if v as i128 >= $primitive::min_value() as i128 - && v as u128 <= $primitive::max_value() as u128 - { - if let Some(nonzero) = Self::Value::new(v as $primitive) { - Ok(nonzero) - } else { - Err(Error::invalid_value(Unexpected::Unsigned(0), &self)) - } - } else { - Err(Error::invalid_value( - Unexpected::Other(stringify!($ty)), - &self, - )) - } - } - }; -} - -impl_deserialize_num! { - i128, NonZeroI128 cfg(not(no_num_nonzero_signed)), deserialize_i128 - num_self!(i128:visit_i128); - num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); - num_128!(u128:visit_u128); -} - -impl_deserialize_num! { - u128, NonZeroU128, deserialize_u128 - num_self!(u128:visit_u128); - num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64); - int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64); - num_128!(i128:visit_i128); -} - -//////////////////////////////////////////////////////////////////////////////// - -struct CharVisitor; - -impl<'de> Visitor<'de> for CharVisitor { - type Value = char; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a character") - } - - #[inline] - fn visit_char<E>(self, v: char) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) - } - - #[inline] - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - let mut iter = v.chars(); - match (iter.next(), iter.next()) { - (Some(c), None) => Ok(c), - _ => Err(Error::invalid_value(Unexpected::Str(v), &self)), - } - } -} - -impl<'de> Deserialize<'de> for char { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_char(CharVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(any(feature = "std", feature = "alloc"))] -struct StringVisitor; -#[cfg(any(feature = "std", feature = "alloc"))] -struct StringInPlaceVisitor<'a>(&'a mut String); - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'de> Visitor<'de> for StringVisitor { - type Value = String; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a string") - } - - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v.to_owned()) - } - - fn visit_string<E>(self, v: String) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) - } - - fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match str::from_utf8(v) { - Ok(s) => Ok(s.to_owned()), - Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), - } - } - - fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> - where - E: Error, - { - match String::from_utf8(v) { - Ok(s) => Ok(s), - Err(e) => Err(Error::invalid_value( - Unexpected::Bytes(&e.into_bytes()), - &self, - )), - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'a, 'de> Visitor<'de> for StringInPlaceVisitor<'a> { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a string") - } - - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - self.0.clear(); - self.0.push_str(v); - Ok(()) - } - - fn visit_string<E>(self, v: String) -> Result<Self::Value, E> - where - E: Error, - { - *self.0 = v; - Ok(()) - } - - fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match str::from_utf8(v) { - Ok(s) => { - self.0.clear(); - self.0.push_str(s); - Ok(()) - } - Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)), - } - } - - fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> - where - E: Error, - { - match String::from_utf8(v) { - Ok(s) => { - *self.0 = s; - Ok(()) - } - Err(e) => Err(Error::invalid_value( - Unexpected::Bytes(&e.into_bytes()), - &self, - )), - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de> Deserialize<'de> for String { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_string(StringVisitor) - } - - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_string(StringInPlaceVisitor(place)) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -struct StrVisitor; - -impl<'a> Visitor<'a> for StrVisitor { - type Value = &'a str; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a borrowed string") - } - - fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) // so easy - } - - fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> - where - E: Error, - { - str::from_utf8(v).map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) - } -} - -impl<'de: 'a, 'a> Deserialize<'de> for &'a str { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_str(StrVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -struct BytesVisitor; - -impl<'a> Visitor<'a> for BytesVisitor { - type Value = &'a [u8]; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a borrowed byte array") - } - - fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v) - } - - fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v.as_bytes()) - } -} - -impl<'de: 'a, 'a> Deserialize<'de> for &'a [u8] { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_bytes(BytesVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(any(feature = "std", all(not(no_core_cstr), feature = "alloc")))] -struct CStringVisitor; - -#[cfg(any(feature = "std", all(not(no_core_cstr), feature = "alloc")))] -impl<'de> Visitor<'de> for CStringVisitor { - type Value = CString; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("byte array") - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let capacity = size_hint::cautious::<u8>(seq.size_hint()); - let mut values = Vec::<u8>::with_capacity(capacity); - - while let Some(value) = tri!(seq.next_element()) { - values.push(value); - } - - CString::new(values).map_err(Error::custom) - } - - fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - CString::new(v).map_err(Error::custom) - } - - fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> - where - E: Error, - { - CString::new(v).map_err(Error::custom) - } - - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - CString::new(v).map_err(Error::custom) - } - - fn visit_string<E>(self, v: String) -> Result<Self::Value, E> - where - E: Error, - { - CString::new(v).map_err(Error::custom) - } -} - -#[cfg(any(feature = "std", all(not(no_core_cstr), feature = "alloc")))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de> Deserialize<'de> for CString { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_byte_buf(CStringVisitor) - } -} - -macro_rules! forwarded_impl { - ( - $(#[$attr:meta])* - ($($id:ident),*), $ty:ty, $func:expr - ) => { - $(#[$attr])* - impl<'de $(, $id : Deserialize<'de>,)*> Deserialize<'de> for $ty { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - Deserialize::deserialize(deserializer).map($func) - } - } - } -} - -forwarded_impl! { - #[cfg(any(feature = "std", all(not(no_core_cstr), feature = "alloc")))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - (), Box<CStr>, CString::into_boxed_c_str -} - -forwarded_impl! { - (T), Reverse<T>, Reverse -} - -//////////////////////////////////////////////////////////////////////////////// - -struct OptionVisitor<T> { - marker: PhantomData<T>, -} - -impl<'de, T> Visitor<'de> for OptionVisitor<T> -where - T: Deserialize<'de>, -{ - type Value = Option<T>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("option") - } - - #[inline] - fn visit_unit<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Ok(None) - } - - #[inline] - fn visit_none<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Ok(None) - } - - #[inline] - fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - T::deserialize(deserializer).map(Some) - } - - fn __private_visit_untagged_option<D>(self, deserializer: D) -> Result<Self::Value, ()> - where - D: Deserializer<'de>, - { - Ok(T::deserialize(deserializer).ok()) - } -} - -impl<'de, T> Deserialize<'de> for Option<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_option(OptionVisitor { - marker: PhantomData, - }) - } - - // The Some variant's repr is opaque, so we can't play cute tricks with its - // tag to have deserialize_in_place build the content in place unconditionally. - // - // FIXME: investigate whether branching on the old value being Some to - // deserialize_in_place the value is profitable (probably data-dependent?) -} - -//////////////////////////////////////////////////////////////////////////////// - -struct PhantomDataVisitor<T: ?Sized> { - marker: PhantomData<T>, -} - -impl<'de, T: ?Sized> Visitor<'de> for PhantomDataVisitor<T> { - type Value = PhantomData<T>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("unit") - } - - #[inline] - fn visit_unit<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Ok(PhantomData) - } -} - -impl<'de, T: ?Sized> Deserialize<'de> for PhantomData<T> { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let visitor = PhantomDataVisitor { - marker: PhantomData, - }; - deserializer.deserialize_unit_struct("PhantomData", visitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! seq_impl { - ( - $(#[$attr:meta])* - $ty:ident <T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)*>, - $access:ident, - $clear:expr, - $with_capacity:expr, - $reserve:expr, - $insert:expr - ) => { - $(#[$attr])* - impl<'de, T $(, $typaram)*> Deserialize<'de> for $ty<T $(, $typaram)*> - where - T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, - $($typaram: $bound1 $(+ $bound2)*,)* - { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct SeqVisitor<T $(, $typaram)*> { - marker: PhantomData<$ty<T $(, $typaram)*>>, - } - - impl<'de, T $(, $typaram)*> Visitor<'de> for SeqVisitor<T $(, $typaram)*> - where - T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, - $($typaram: $bound1 $(+ $bound2)*,)* - { - type Value = $ty<T $(, $typaram)*>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a sequence") - } - - #[inline] - fn visit_seq<A>(self, mut $access: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let mut values = $with_capacity; - - while let Some(value) = tri!($access.next_element()) { - $insert(&mut values, value); - } - - Ok(values) - } - } - - let visitor = SeqVisitor { marker: PhantomData }; - deserializer.deserialize_seq(visitor) - } - - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - struct SeqInPlaceVisitor<'a, T: 'a $(, $typaram: 'a)*>(&'a mut $ty<T $(, $typaram)*>); - - impl<'a, 'de, T $(, $typaram)*> Visitor<'de> for SeqInPlaceVisitor<'a, T $(, $typaram)*> - where - T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*, - $($typaram: $bound1 $(+ $bound2)*,)* - { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a sequence") - } - - #[inline] - fn visit_seq<A>(mut self, mut $access: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - $clear(&mut self.0); - $reserve(&mut self.0, size_hint::cautious::<T>($access.size_hint())); - - // FIXME: try to overwrite old values here? (Vec, VecDeque, LinkedList) - while let Some(value) = tri!($access.next_element()) { - $insert(&mut self.0, value); - } - - Ok(()) - } - } - - deserializer.deserialize_seq(SeqInPlaceVisitor(place)) - } - } - } -} - -// Dummy impl of reserve -#[cfg(any(feature = "std", feature = "alloc"))] -fn nop_reserve<T>(_seq: T, _n: usize) {} - -seq_impl!( - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - BinaryHeap<T: Ord>, - seq, - BinaryHeap::clear, - BinaryHeap::with_capacity(size_hint::cautious::<T>(seq.size_hint())), - BinaryHeap::reserve, - BinaryHeap::push -); - -seq_impl!( - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - BTreeSet<T: Eq + Ord>, - seq, - BTreeSet::clear, - BTreeSet::new(), - nop_reserve, - BTreeSet::insert -); - -seq_impl!( - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - LinkedList<T>, - seq, - LinkedList::clear, - LinkedList::new(), - nop_reserve, - LinkedList::push_back -); - -seq_impl!( - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - HashSet<T: Eq + Hash, S: BuildHasher + Default>, - seq, - HashSet::clear, - HashSet::with_capacity_and_hasher(size_hint::cautious::<T>(seq.size_hint()), S::default()), - HashSet::reserve, - HashSet::insert -); - -seq_impl!( - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - VecDeque<T>, - seq, - VecDeque::clear, - VecDeque::with_capacity(size_hint::cautious::<T>(seq.size_hint())), - VecDeque::reserve, - VecDeque::push_back -); - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, T> Deserialize<'de> for Vec<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct VecVisitor<T> { - marker: PhantomData<T>, - } - - impl<'de, T> Visitor<'de> for VecVisitor<T> - where - T: Deserialize<'de>, - { - type Value = Vec<T>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a sequence") - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let capacity = size_hint::cautious::<T>(seq.size_hint()); - let mut values = Vec::<T>::with_capacity(capacity); - - while let Some(value) = tri!(seq.next_element()) { - values.push(value); - } - - Ok(values) - } - } - - let visitor = VecVisitor { - marker: PhantomData, - }; - deserializer.deserialize_seq(visitor) - } - - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - struct VecInPlaceVisitor<'a, T: 'a>(&'a mut Vec<T>); - - impl<'a, 'de, T> Visitor<'de> for VecInPlaceVisitor<'a, T> - where - T: Deserialize<'de>, - { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a sequence") - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let hint = size_hint::cautious::<T>(seq.size_hint()); - if let Some(additional) = hint.checked_sub(self.0.len()) { - self.0.reserve(additional); - } - - for i in 0..self.0.len() { - let next = { - let next_place = InPlaceSeed(&mut self.0[i]); - tri!(seq.next_element_seed(next_place)) - }; - if next.is_none() { - self.0.truncate(i); - return Ok(()); - } - } - - while let Some(value) = tri!(seq.next_element()) { - self.0.push(value); - } - - Ok(()) - } - } - - deserializer.deserialize_seq(VecInPlaceVisitor(place)) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -struct ArrayVisitor<A> { - marker: PhantomData<A>, -} -struct ArrayInPlaceVisitor<'a, A: 'a>(&'a mut A); - -impl<A> ArrayVisitor<A> { - fn new() -> Self { - ArrayVisitor { - marker: PhantomData, - } - } -} - -impl<'de, T> Visitor<'de> for ArrayVisitor<[T; 0]> { - type Value = [T; 0]; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("an empty array") - } - - #[inline] - fn visit_seq<A>(self, _: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - Ok([]) - } -} - -// Does not require T: Deserialize<'de>. -impl<'de, T> Deserialize<'de> for [T; 0] { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_tuple(0, ArrayVisitor::<[T; 0]>::new()) - } -} - -macro_rules! array_impls { - ($($len:expr => ($($n:tt)+))+) => { - $( - impl<'de, T> Visitor<'de> for ArrayVisitor<[T; $len]> - where - T: Deserialize<'de>, - { - type Value = [T; $len]; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("an array of length ", $len)) - } - - #[inline] - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - Ok([$( - match tri!(seq.next_element()) { - Some(val) => val, - None => return Err(Error::invalid_length($n, &self)), - } - ),+]) - } - } - - impl<'a, 'de, T> Visitor<'de> for ArrayInPlaceVisitor<'a, [T; $len]> - where - T: Deserialize<'de>, - { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("an array of length ", $len)) - } - - #[inline] - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let mut fail_idx = None; - for (idx, dest) in self.0[..].iter_mut().enumerate() { - if tri!(seq.next_element_seed(InPlaceSeed(dest))).is_none() { - fail_idx = Some(idx); - break; - } - } - if let Some(idx) = fail_idx { - return Err(Error::invalid_length(idx, &self)); - } - Ok(()) - } - } - - impl<'de, T> Deserialize<'de> for [T; $len] - where - T: Deserialize<'de>, - { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_tuple($len, ArrayVisitor::<[T; $len]>::new()) - } - - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_tuple($len, ArrayInPlaceVisitor(place)) - } - } - )+ - } -} - -array_impls! { - 1 => (0) - 2 => (0 1) - 3 => (0 1 2) - 4 => (0 1 2 3) - 5 => (0 1 2 3 4) - 6 => (0 1 2 3 4 5) - 7 => (0 1 2 3 4 5 6) - 8 => (0 1 2 3 4 5 6 7) - 9 => (0 1 2 3 4 5 6 7 8) - 10 => (0 1 2 3 4 5 6 7 8 9) - 11 => (0 1 2 3 4 5 6 7 8 9 10) - 12 => (0 1 2 3 4 5 6 7 8 9 10 11) - 13 => (0 1 2 3 4 5 6 7 8 9 10 11 12) - 14 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13) - 15 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14) - 16 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15) - 17 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16) - 18 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17) - 19 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18) - 20 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19) - 21 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20) - 22 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21) - 23 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22) - 24 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23) - 25 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24) - 26 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25) - 27 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26) - 28 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27) - 29 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28) - 30 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29) - 31 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30) - 32 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31) -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! tuple_impls { - ($($len:tt => ($($n:tt $name:ident)+))+) => { - $( - impl<'de, $($name: Deserialize<'de>),+> Deserialize<'de> for ($($name,)+) { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct TupleVisitor<$($name,)+> { - marker: PhantomData<($($name,)+)>, - } - - impl<'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleVisitor<$($name,)+> { - type Value = ($($name,)+); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("a tuple of size ", $len)) - } - - #[inline] - #[allow(non_snake_case)] - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - $( - let $name = match tri!(seq.next_element()) { - Some(value) => value, - None => return Err(Error::invalid_length($n, &self)), - }; - )+ - - Ok(($($name,)+)) - } - } - - deserializer.deserialize_tuple($len, TupleVisitor { marker: PhantomData }) - } - - #[inline] - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - struct TupleInPlaceVisitor<'a, $($name: 'a,)+>(&'a mut ($($name,)+)); - - impl<'a, 'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleInPlaceVisitor<'a, $($name,)+> { - type Value = (); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("a tuple of size ", $len)) - } - - #[inline] - #[allow(non_snake_case)] - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - $( - if tri!(seq.next_element_seed(InPlaceSeed(&mut (self.0).$n))).is_none() { - return Err(Error::invalid_length($n, &self)); - } - )+ - - Ok(()) - } - } - - deserializer.deserialize_tuple($len, TupleInPlaceVisitor(place)) - } - } - )+ - } -} - -tuple_impls! { - 1 => (0 T0) - 2 => (0 T0 1 T1) - 3 => (0 T0 1 T1 2 T2) - 4 => (0 T0 1 T1 2 T2 3 T3) - 5 => (0 T0 1 T1 2 T2 3 T3 4 T4) - 6 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5) - 7 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6) - 8 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7) - 9 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8) - 10 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9) - 11 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10) - 12 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11) - 13 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12) - 14 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13) - 15 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14) - 16 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15) -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! map_impl { - ( - $(#[$attr:meta])* - $ty:ident <K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)*>, - $access:ident, - $with_capacity:expr, - ) => { - $(#[$attr])* - impl<'de, K, V $(, $typaram)*> Deserialize<'de> for $ty<K, V $(, $typaram)*> - where - K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*, - V: Deserialize<'de>, - $($typaram: $bound1 $(+ $bound2)*),* - { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct MapVisitor<K, V $(, $typaram)*> { - marker: PhantomData<$ty<K, V $(, $typaram)*>>, - } - - impl<'de, K, V $(, $typaram)*> Visitor<'de> for MapVisitor<K, V $(, $typaram)*> - where - K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*, - V: Deserialize<'de>, - $($typaram: $bound1 $(+ $bound2)*),* - { - type Value = $ty<K, V $(, $typaram)*>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a map") - } - - #[inline] - fn visit_map<A>(self, mut $access: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut values = $with_capacity; - - while let Some((key, value)) = tri!($access.next_entry()) { - values.insert(key, value); - } - - Ok(values) - } - } - - let visitor = MapVisitor { marker: PhantomData }; - deserializer.deserialize_map(visitor) - } - } - } -} - -map_impl! { - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - BTreeMap<K: Ord, V>, - map, - BTreeMap::new(), -} - -map_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - HashMap<K: Eq + Hash, V, S: BuildHasher + Default>, - map, - HashMap::with_capacity_and_hasher(size_hint::cautious::<(K, V)>(map.size_hint()), S::default()), -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! parse_ip_impl { - ( - $(#[$attr:meta])* - $ty:ty, $expecting:expr, $size:tt - ) => { - $(#[$attr])* - impl<'de> Deserialize<'de> for $ty { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - if deserializer.is_human_readable() { - deserializer.deserialize_str(FromStrVisitor::new($expecting)) - } else { - <[u8; $size]>::deserialize(deserializer).map(<$ty>::from) - } - } - } - }; -} - -#[cfg(feature = "std")] -macro_rules! variant_identifier { - ( - $name_kind:ident ($($variant:ident; $bytes:expr; $index:expr),*) - $expecting_message:expr, - $variants_name:ident - ) => { - enum $name_kind { - $($variant),* - } - - static $variants_name: &[&str] = &[$(stringify!($variant)),*]; - - impl<'de> Deserialize<'de> for $name_kind { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct KindVisitor; - - impl<'de> Visitor<'de> for KindVisitor { - type Value = $name_kind; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str($expecting_message) - } - - fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> - where - E: Error, - { - match value { - $( - $index => Ok($name_kind :: $variant), - )* - _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self),), - } - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - $( - stringify!($variant) => Ok($name_kind :: $variant), - )* - _ => Err(Error::unknown_variant(value, $variants_name)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - $( - $bytes => Ok($name_kind :: $variant), - )* - _ => { - match str::from_utf8(value) { - Ok(value) => Err(Error::unknown_variant(value, $variants_name)), - Err(_) => Err(Error::invalid_value(Unexpected::Bytes(value), &self)), - } - } - } - } - } - - deserializer.deserialize_identifier(KindVisitor) - } - } - } -} - -#[cfg(feature = "std")] -macro_rules! deserialize_enum { - ( - $name:ident $name_kind:ident ($($variant:ident; $bytes:expr; $index:expr),*) - $expecting_message:expr, - $deserializer:expr - ) => { - variant_identifier! { - $name_kind ($($variant; $bytes; $index),*) - $expecting_message, - VARIANTS - } - - struct EnumVisitor; - impl<'de> Visitor<'de> for EnumVisitor { - type Value = $name; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(concat!("a ", stringify!($name))) - } - - - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - match tri!(data.variant()) { - $( - ($name_kind :: $variant, v) => v.newtype_variant().map($name :: $variant), - )* - } - } - } - $deserializer.deserialize_enum(stringify!($name), VARIANTS, EnumVisitor) - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de> Deserialize<'de> for net::IpAddr { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - if deserializer.is_human_readable() { - deserializer.deserialize_str(FromStrVisitor::new("IP address")) - } else { - use crate::lib::net::IpAddr; - deserialize_enum! { - IpAddr IpAddrKind (V4; b"V4"; 0, V6; b"V6"; 1) - "`V4` or `V6`", - deserializer - } - } - } -} - -parse_ip_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - net::Ipv4Addr, "IPv4 address", 4 -} - -parse_ip_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - net::Ipv6Addr, "IPv6 address", 16 -} - -macro_rules! parse_socket_impl { - ( - $(#[$attr:meta])* - $ty:ty, $expecting:tt, - $new:expr, - ) => { - $(#[$attr])* - impl<'de> Deserialize<'de> for $ty { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - if deserializer.is_human_readable() { - deserializer.deserialize_str(FromStrVisitor::new($expecting)) - } else { - <(_, u16)>::deserialize(deserializer).map($new) - } - } - } - }; -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de> Deserialize<'de> for net::SocketAddr { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - if deserializer.is_human_readable() { - deserializer.deserialize_str(FromStrVisitor::new("socket address")) - } else { - use crate::lib::net::SocketAddr; - deserialize_enum! { - SocketAddr SocketAddrKind (V4; b"V4"; 0, V6; b"V6"; 1) - "`V4` or `V6`", - deserializer - } - } - } -} - -parse_socket_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - net::SocketAddrV4, "IPv4 socket address", - |(ip, port)| net::SocketAddrV4::new(ip, port), -} - -parse_socket_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - net::SocketAddrV6, "IPv6 socket address", - |(ip, port)| net::SocketAddrV6::new(ip, port, 0, 0), -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(feature = "std")] -struct PathVisitor; - -#[cfg(feature = "std")] -impl<'a> Visitor<'a> for PathVisitor { - type Value = &'a Path; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("a borrowed path") - } - - fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E> - where - E: Error, - { - Ok(v.as_ref()) - } - - fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E> - where - E: Error, - { - str::from_utf8(v) - .map(AsRef::as_ref) - .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de: 'a, 'a> Deserialize<'de> for &'a Path { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_str(PathVisitor) - } -} - -#[cfg(feature = "std")] -struct PathBufVisitor; - -#[cfg(feature = "std")] -impl<'de> Visitor<'de> for PathBufVisitor { - type Value = PathBuf; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("path string") - } - - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - Ok(From::from(v)) - } - - fn visit_string<E>(self, v: String) -> Result<Self::Value, E> - where - E: Error, - { - Ok(From::from(v)) - } - - fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - str::from_utf8(v) - .map(From::from) - .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self)) - } - - fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> - where - E: Error, - { - String::from_utf8(v) - .map(From::from) - .map_err(|e| Error::invalid_value(Unexpected::Bytes(&e.into_bytes()), &self)) - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de> Deserialize<'de> for PathBuf { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_string(PathBufVisitor) - } -} - -forwarded_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - (), Box<Path>, PathBuf::into_boxed_path -} - -//////////////////////////////////////////////////////////////////////////////// - -// If this were outside of the serde crate, it would just use: -// -// #[derive(Deserialize)] -// #[serde(variant_identifier)] -#[cfg(all(feature = "std", any(unix, windows)))] -variant_identifier! { - OsStringKind (Unix; b"Unix"; 0, Windows; b"Windows"; 1) - "`Unix` or `Windows`", - OSSTR_VARIANTS -} - -#[cfg(all(feature = "std", any(unix, windows)))] -struct OsStringVisitor; - -#[cfg(all(feature = "std", any(unix, windows)))] -impl<'de> Visitor<'de> for OsStringVisitor { - type Value = OsString; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("os string") - } - - #[cfg(unix)] - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - use std::os::unix::ffi::OsStringExt; - - match tri!(data.variant()) { - (OsStringKind::Unix, v) => v.newtype_variant().map(OsString::from_vec), - (OsStringKind::Windows, _) => Err(Error::custom( - "cannot deserialize Windows OS string on Unix", - )), - } - } - - #[cfg(windows)] - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - use std::os::windows::ffi::OsStringExt; - - match tri!(data.variant()) { - (OsStringKind::Windows, v) => v - .newtype_variant::<Vec<u16>>() - .map(|vec| OsString::from_wide(&vec)), - (OsStringKind::Unix, _) => Err(Error::custom( - "cannot deserialize Unix OS string on Windows", - )), - } - } -} - -#[cfg(all(feature = "std", any(unix, windows)))] -#[cfg_attr(doc_cfg, doc(cfg(all(feature = "std", any(unix, windows)))))] -impl<'de> Deserialize<'de> for OsString { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_enum("OsString", OSSTR_VARIANTS, OsStringVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -forwarded_impl! { - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - (T), Box<T>, Box::new -} - -forwarded_impl! { - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - (T), Box<[T]>, Vec::into_boxed_slice -} - -forwarded_impl! { - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - (), Box<str>, String::into_boxed_str -} - -forwarded_impl! { - #[cfg(all(feature = "std", any(unix, windows)))] - #[cfg_attr(doc_cfg, doc(cfg(all(feature = "std", any(unix, windows)))))] - (), Box<OsStr>, OsString::into_boxed_os_str -} - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T> -where - T: ToOwned, - T::Owned: Deserialize<'de>, -{ - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - T::Owned::deserialize(deserializer).map(Cow::Owned) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting -/// `Weak<T>` has a reference count of 0 and cannot be upgraded. -/// -/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc -#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] -#[cfg_attr( - doc_cfg, - doc(cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))) -)] -impl<'de, T: ?Sized> Deserialize<'de> for RcWeak<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - tri!(Option::<T>::deserialize(deserializer)); - Ok(RcWeak::new()) - } -} - -/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting -/// `Weak<T>` has a reference count of 0 and cannot be upgraded. -/// -/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc -#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] -#[cfg_attr( - doc_cfg, - doc(cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))) -)] -impl<'de, T: ?Sized> Deserialize<'de> for ArcWeak<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - tri!(Option::<T>::deserialize(deserializer)); - Ok(ArcWeak::new()) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! box_forwarded_impl { - ( - $(#[$attr:meta])* - $t:ident - ) => { - $(#[$attr])* - impl<'de, T: ?Sized> Deserialize<'de> for $t<T> - where - Box<T>: Deserialize<'de>, - { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - Box::deserialize(deserializer).map(Into::into) - } - } - }; -} - -box_forwarded_impl! { - /// This impl requires the [`"rc"`] Cargo feature of Serde. - /// - /// Deserializing a data structure containing `Rc` will not attempt to - /// deduplicate `Rc` references to the same data. Every deserialized `Rc` - /// will end up with a strong count of 1. - /// - /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc - #[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] - #[cfg_attr(doc_cfg, doc(cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))))] - Rc -} - -box_forwarded_impl! { - /// This impl requires the [`"rc"`] Cargo feature of Serde. - /// - /// Deserializing a data structure containing `Arc` will not attempt to - /// deduplicate `Arc` references to the same data. Every deserialized `Arc` - /// will end up with a strong count of 1. - /// - /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc - #[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))] - #[cfg_attr(doc_cfg, doc(cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))))] - Arc -} - -//////////////////////////////////////////////////////////////////////////////// - -impl<'de, T> Deserialize<'de> for Cell<T> -where - T: Deserialize<'de> + Copy, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - T::deserialize(deserializer).map(Cell::new) - } -} - -forwarded_impl! { - (T), RefCell<T>, RefCell::new -} - -forwarded_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - (T), Mutex<T>, Mutex::new -} - -forwarded_impl! { - #[cfg(feature = "std")] - #[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] - (T), RwLock<T>, RwLock::new -} - -//////////////////////////////////////////////////////////////////////////////// - -// This is a cleaned-up version of the impl generated by: -// -// #[derive(Deserialize)] -// #[serde(deny_unknown_fields)] -// struct Duration { -// secs: u64, -// nanos: u32, -// } -impl<'de> Deserialize<'de> for Duration { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - // If this were outside of the serde crate, it would just use: - // - // #[derive(Deserialize)] - // #[serde(field_identifier, rename_all = "lowercase")] - enum Field { - Secs, - Nanos, - } - - impl<'de> Deserialize<'de> for Field { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`secs` or `nanos`") - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "secs" => Ok(Field::Secs), - "nanos" => Ok(Field::Nanos), - _ => Err(Error::unknown_field(value, FIELDS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"secs" => Ok(Field::Secs), - b"nanos" => Ok(Field::Nanos), - _ => { - let value = crate::__private::from_utf8_lossy(value); - Err(Error::unknown_field(&*value, FIELDS)) - } - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E> - where - E: Error, - { - static NANOS_PER_SEC: u32 = 1_000_000_000; - match secs.checked_add((nanos / NANOS_PER_SEC) as u64) { - Some(_) => Ok(()), - None => Err(E::custom("overflow deserializing Duration")), - } - } - - struct DurationVisitor; - - impl<'de> Visitor<'de> for DurationVisitor { - type Value = Duration; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("struct Duration") - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let secs: u64 = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(0, &self)); - } - }; - let nanos: u32 = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(1, &self)); - } - }; - tri!(check_overflow(secs, nanos)); - Ok(Duration::new(secs, nanos)) - } - - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut secs: Option<u64> = None; - let mut nanos: Option<u32> = None; - while let Some(key) = tri!(map.next_key()) { - match key { - Field::Secs => { - if secs.is_some() { - return Err(<A::Error as Error>::duplicate_field("secs")); - } - secs = Some(tri!(map.next_value())); - } - Field::Nanos => { - if nanos.is_some() { - return Err(<A::Error as Error>::duplicate_field("nanos")); - } - nanos = Some(tri!(map.next_value())); - } - } - } - let secs = match secs { - Some(secs) => secs, - None => return Err(<A::Error as Error>::missing_field("secs")), - }; - let nanos = match nanos { - Some(nanos) => nanos, - None => return Err(<A::Error as Error>::missing_field("nanos")), - }; - tri!(check_overflow(secs, nanos)); - Ok(Duration::new(secs, nanos)) - } - } - - const FIELDS: &[&str] = &["secs", "nanos"]; - deserializer.deserialize_struct("Duration", FIELDS, DurationVisitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de> Deserialize<'de> for SystemTime { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - // Reuse duration - enum Field { - Secs, - Nanos, - } - - impl<'de> Deserialize<'de> for Field { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`secs_since_epoch` or `nanos_since_epoch`") - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "secs_since_epoch" => Ok(Field::Secs), - "nanos_since_epoch" => Ok(Field::Nanos), - _ => Err(Error::unknown_field(value, FIELDS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"secs_since_epoch" => Ok(Field::Secs), - b"nanos_since_epoch" => Ok(Field::Nanos), - _ => { - let value = String::from_utf8_lossy(value); - Err(Error::unknown_field(&value, FIELDS)) - } - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E> - where - E: Error, - { - static NANOS_PER_SEC: u32 = 1_000_000_000; - match secs.checked_add((nanos / NANOS_PER_SEC) as u64) { - Some(_) => Ok(()), - None => Err(E::custom("overflow deserializing SystemTime epoch offset")), - } - } - - struct DurationVisitor; - - impl<'de> Visitor<'de> for DurationVisitor { - type Value = Duration; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("struct SystemTime") - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let secs: u64 = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(0, &self)); - } - }; - let nanos: u32 = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(1, &self)); - } - }; - tri!(check_overflow(secs, nanos)); - Ok(Duration::new(secs, nanos)) - } - - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut secs: Option<u64> = None; - let mut nanos: Option<u32> = None; - while let Some(key) = tri!(map.next_key()) { - match key { - Field::Secs => { - if secs.is_some() { - return Err(<A::Error as Error>::duplicate_field( - "secs_since_epoch", - )); - } - secs = Some(tri!(map.next_value())); - } - Field::Nanos => { - if nanos.is_some() { - return Err(<A::Error as Error>::duplicate_field( - "nanos_since_epoch", - )); - } - nanos = Some(tri!(map.next_value())); - } - } - } - let secs = match secs { - Some(secs) => secs, - None => return Err(<A::Error as Error>::missing_field("secs_since_epoch")), - }; - let nanos = match nanos { - Some(nanos) => nanos, - None => return Err(<A::Error as Error>::missing_field("nanos_since_epoch")), - }; - tri!(check_overflow(secs, nanos)); - Ok(Duration::new(secs, nanos)) - } - } - - const FIELDS: &[&str] = &["secs_since_epoch", "nanos_since_epoch"]; - let duration = tri!(deserializer.deserialize_struct("SystemTime", FIELDS, DurationVisitor)); - #[cfg(not(no_systemtime_checked_add))] - let ret = UNIX_EPOCH - .checked_add(duration) - .ok_or_else(|| D::Error::custom("overflow deserializing SystemTime")); - #[cfg(no_systemtime_checked_add)] - let ret = Ok(UNIX_EPOCH + duration); - ret - } -} - -//////////////////////////////////////////////////////////////////////////////// - -// Similar to: -// -// #[derive(Deserialize)] -// #[serde(deny_unknown_fields)] -// struct Range<Idx> { -// start: Idx, -// end: Idx, -// } -impl<'de, Idx> Deserialize<'de> for Range<Idx> -where - Idx: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let (start, end) = tri!(deserializer.deserialize_struct( - "Range", - range::FIELDS, - range::RangeVisitor { - expecting: "struct Range", - phantom: PhantomData, - }, - )); - Ok(start..end) - } -} - -impl<'de, Idx> Deserialize<'de> for RangeInclusive<Idx> -where - Idx: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let (start, end) = tri!(deserializer.deserialize_struct( - "RangeInclusive", - range::FIELDS, - range::RangeVisitor { - expecting: "struct RangeInclusive", - phantom: PhantomData, - }, - )); - Ok(RangeInclusive::new(start, end)) - } -} - -mod range { - use crate::lib::*; - - use crate::de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor}; - - pub const FIELDS: &[&str] = &["start", "end"]; - - // If this were outside of the serde crate, it would just use: - // - // #[derive(Deserialize)] - // #[serde(field_identifier, rename_all = "lowercase")] - enum Field { - Start, - End, - } - - impl<'de> Deserialize<'de> for Field { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`start` or `end`") - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "start" => Ok(Field::Start), - "end" => Ok(Field::End), - _ => Err(Error::unknown_field(value, FIELDS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"start" => Ok(Field::Start), - b"end" => Ok(Field::End), - _ => { - let value = crate::__private::from_utf8_lossy(value); - Err(Error::unknown_field(&*value, FIELDS)) - } - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - pub struct RangeVisitor<Idx> { - pub expecting: &'static str, - pub phantom: PhantomData<Idx>, - } - - impl<'de, Idx> Visitor<'de> for RangeVisitor<Idx> - where - Idx: Deserialize<'de>, - { - type Value = (Idx, Idx); - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(self.expecting) - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let start: Idx = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(0, &self)); - } - }; - let end: Idx = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(1, &self)); - } - }; - Ok((start, end)) - } - - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut start: Option<Idx> = None; - let mut end: Option<Idx> = None; - while let Some(key) = tri!(map.next_key()) { - match key { - Field::Start => { - if start.is_some() { - return Err(<A::Error as Error>::duplicate_field("start")); - } - start = Some(tri!(map.next_value())); - } - Field::End => { - if end.is_some() { - return Err(<A::Error as Error>::duplicate_field("end")); - } - end = Some(tri!(map.next_value())); - } - } - } - let start = match start { - Some(start) => start, - None => return Err(<A::Error as Error>::missing_field("start")), - }; - let end = match end { - Some(end) => end, - None => return Err(<A::Error as Error>::missing_field("end")), - }; - Ok((start, end)) - } - } -} - -//////////////////////////////////////////////////////////////////////////////// - -// Similar to: -// -// #[derive(Deserialize)] -// #[serde(deny_unknown_fields)] -// struct RangeFrom<Idx> { -// start: Idx, -// } -impl<'de, Idx> Deserialize<'de> for RangeFrom<Idx> -where - Idx: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let start = tri!(deserializer.deserialize_struct( - "RangeFrom", - range_from::FIELDS, - range_from::RangeFromVisitor { - expecting: "struct RangeFrom", - phantom: PhantomData, - }, - )); - Ok(start..) - } -} - -mod range_from { - use crate::lib::*; - - use crate::de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor}; - - pub const FIELDS: &[&str] = &["start"]; - - // If this were outside of the serde crate, it would just use: - // - // #[derive(Deserialize)] - // #[serde(field_identifier, rename_all = "lowercase")] - enum Field { - Start, - } - - impl<'de> Deserialize<'de> for Field { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`start`") - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "start" => Ok(Field::Start), - _ => Err(Error::unknown_field(value, FIELDS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"start" => Ok(Field::Start), - _ => { - let value = crate::__private::from_utf8_lossy(value); - Err(Error::unknown_field(&*value, FIELDS)) - } - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - pub struct RangeFromVisitor<Idx> { - pub expecting: &'static str, - pub phantom: PhantomData<Idx>, - } - - impl<'de, Idx> Visitor<'de> for RangeFromVisitor<Idx> - where - Idx: Deserialize<'de>, - { - type Value = Idx; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(self.expecting) - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let start: Idx = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(0, &self)); - } - }; - Ok(start) - } - - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut start: Option<Idx> = None; - while let Some(key) = tri!(map.next_key()) { - match key { - Field::Start => { - if start.is_some() { - return Err(<A::Error as Error>::duplicate_field("start")); - } - start = Some(tri!(map.next_value())); - } - } - } - let start = match start { - Some(start) => start, - None => return Err(<A::Error as Error>::missing_field("start")), - }; - Ok(start) - } - } -} - -//////////////////////////////////////////////////////////////////////////////// - -// Similar to: -// -// #[derive(Deserialize)] -// #[serde(deny_unknown_fields)] -// struct RangeTo<Idx> { -// end: Idx, -// } -impl<'de, Idx> Deserialize<'de> for RangeTo<Idx> -where - Idx: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let end = tri!(deserializer.deserialize_struct( - "RangeTo", - range_to::FIELDS, - range_to::RangeToVisitor { - expecting: "struct RangeTo", - phantom: PhantomData, - }, - )); - Ok(..end) - } -} - -mod range_to { - use crate::lib::*; - - use crate::de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor}; - - pub const FIELDS: &[&str] = &["end"]; - - // If this were outside of the serde crate, it would just use: - // - // #[derive(Deserialize)] - // #[serde(field_identifier, rename_all = "lowercase")] - enum Field { - End, - } - - impl<'de> Deserialize<'de> for Field { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`end`") - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "end" => Ok(Field::End), - _ => Err(Error::unknown_field(value, FIELDS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"end" => Ok(Field::End), - _ => { - let value = crate::__private::from_utf8_lossy(value); - Err(Error::unknown_field(&*value, FIELDS)) - } - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - pub struct RangeToVisitor<Idx> { - pub expecting: &'static str, - pub phantom: PhantomData<Idx>, - } - - impl<'de, Idx> Visitor<'de> for RangeToVisitor<Idx> - where - Idx: Deserialize<'de>, - { - type Value = Idx; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(self.expecting) - } - - fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let end: Idx = match tri!(seq.next_element()) { - Some(value) => value, - None => { - return Err(Error::invalid_length(0, &self)); - } - }; - Ok(end) - } - - fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let mut end: Option<Idx> = None; - while let Some(key) = tri!(map.next_key()) { - match key { - Field::End => { - if end.is_some() { - return Err(<A::Error as Error>::duplicate_field("end")); - } - end = Some(tri!(map.next_value())); - } - } - } - let end = match end { - Some(end) => end, - None => return Err(<A::Error as Error>::missing_field("end")), - }; - Ok(end) - } - } -} - -//////////////////////////////////////////////////////////////////////////////// - -impl<'de, T> Deserialize<'de> for Bound<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - enum Field { - Unbounded, - Included, - Excluded, - } - - impl<'de> Deserialize<'de> for Field { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`Unbounded`, `Included` or `Excluded`") - } - - fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> - where - E: Error, - { - match value { - 0 => Ok(Field::Unbounded), - 1 => Ok(Field::Included), - 2 => Ok(Field::Excluded), - _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)), - } - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "Unbounded" => Ok(Field::Unbounded), - "Included" => Ok(Field::Included), - "Excluded" => Ok(Field::Excluded), - _ => Err(Error::unknown_variant(value, VARIANTS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"Unbounded" => Ok(Field::Unbounded), - b"Included" => Ok(Field::Included), - b"Excluded" => Ok(Field::Excluded), - _ => match str::from_utf8(value) { - Ok(value) => Err(Error::unknown_variant(value, VARIANTS)), - Err(_) => { - Err(Error::invalid_value(Unexpected::Bytes(value), &self)) - } - }, - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - struct BoundVisitor<T>(PhantomData<Bound<T>>); - - impl<'de, T> Visitor<'de> for BoundVisitor<T> - where - T: Deserialize<'de>, - { - type Value = Bound<T>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("enum Bound") - } - - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - match tri!(data.variant()) { - (Field::Unbounded, v) => v.unit_variant().map(|()| Bound::Unbounded), - (Field::Included, v) => v.newtype_variant().map(Bound::Included), - (Field::Excluded, v) => v.newtype_variant().map(Bound::Excluded), - } - } - } - - const VARIANTS: &[&str] = &["Unbounded", "Included", "Excluded"]; - - deserializer.deserialize_enum("Bound", VARIANTS, BoundVisitor(PhantomData)) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -impl<'de, T, E> Deserialize<'de> for Result<T, E> -where - T: Deserialize<'de>, - E: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - // If this were outside of the serde crate, it would just use: - // - // #[derive(Deserialize)] - // #[serde(variant_identifier)] - enum Field { - Ok, - Err, - } - - impl<'de> Deserialize<'de> for Field { - #[inline] - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - struct FieldVisitor; - - impl<'de> Visitor<'de> for FieldVisitor { - type Value = Field; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("`Ok` or `Err`") - } - - fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> - where - E: Error, - { - match value { - 0 => Ok(Field::Ok), - 1 => Ok(Field::Err), - _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)), - } - } - - fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> - where - E: Error, - { - match value { - "Ok" => Ok(Field::Ok), - "Err" => Ok(Field::Err), - _ => Err(Error::unknown_variant(value, VARIANTS)), - } - } - - fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - match value { - b"Ok" => Ok(Field::Ok), - b"Err" => Ok(Field::Err), - _ => match str::from_utf8(value) { - Ok(value) => Err(Error::unknown_variant(value, VARIANTS)), - Err(_) => { - Err(Error::invalid_value(Unexpected::Bytes(value), &self)) - } - }, - } - } - } - - deserializer.deserialize_identifier(FieldVisitor) - } - } - - struct ResultVisitor<T, E>(PhantomData<Result<T, E>>); - - impl<'de, T, E> Visitor<'de> for ResultVisitor<T, E> - where - T: Deserialize<'de>, - E: Deserialize<'de>, - { - type Value = Result<T, E>; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("enum Result") - } - - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - match tri!(data.variant()) { - (Field::Ok, v) => v.newtype_variant().map(Ok), - (Field::Err, v) => v.newtype_variant().map(Err), - } - } - } - - const VARIANTS: &[&str] = &["Ok", "Err"]; - - deserializer.deserialize_enum("Result", VARIANTS, ResultVisitor(PhantomData)) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -impl<'de, T> Deserialize<'de> for Wrapping<T> -where - T: Deserialize<'de>, -{ - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - Deserialize::deserialize(deserializer).map(Wrapping) - } -} - -#[cfg(all(feature = "std", not(no_std_atomic)))] -macro_rules! atomic_impl { - ($($ty:ident $size:expr)*) => { - $( - #[cfg(any(no_target_has_atomic, target_has_atomic = $size))] - #[cfg_attr(doc_cfg, doc(cfg(all(feature = "std", target_has_atomic = $size))))] - impl<'de> Deserialize<'de> for $ty { - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - Deserialize::deserialize(deserializer).map(Self::new) - } - } - )* - }; -} - -#[cfg(all(feature = "std", not(no_std_atomic)))] -atomic_impl! { - AtomicBool "8" - AtomicI8 "8" - AtomicI16 "16" - AtomicI32 "32" - AtomicIsize "ptr" - AtomicU8 "8" - AtomicU16 "16" - AtomicU32 "32" - AtomicUsize "ptr" -} - -#[cfg(all(feature = "std", not(no_std_atomic64)))] -atomic_impl! { - AtomicI64 "64" - AtomicU64 "64" -} - -#[cfg(feature = "std")] -struct FromStrVisitor<T> { - expecting: &'static str, - ty: PhantomData<T>, -} - -#[cfg(feature = "std")] -impl<T> FromStrVisitor<T> { - fn new(expecting: &'static str) -> Self { - FromStrVisitor { - expecting, - ty: PhantomData, - } - } -} - -#[cfg(feature = "std")] -impl<'de, T> Visitor<'de> for FromStrVisitor<T> -where - T: str::FromStr, - T::Err: fmt::Display, -{ - type Value = T; - - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(self.expecting) - } - - fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> - where - E: Error, - { - s.parse().map_err(Error::custom) - } -} diff --git a/vendor/serde/src/de/mod.rs b/vendor/serde/src/de/mod.rs deleted file mode 100644 index c9919d9..0000000 --- a/vendor/serde/src/de/mod.rs +++ /dev/null @@ -1,2292 +0,0 @@ -//! Generic data structure deserialization framework. -//! -//! The two most important traits in this module are [`Deserialize`] and -//! [`Deserializer`]. -//! -//! - **A type that implements `Deserialize` is a data structure** that can be -//! deserialized from any data format supported by Serde, and conversely -//! - **A type that implements `Deserializer` is a data format** that can -//! deserialize any data structure supported by Serde. -//! -//! # The Deserialize trait -//! -//! Serde provides [`Deserialize`] implementations for many Rust primitive and -//! standard library types. The complete list is below. All of these can be -//! deserialized using Serde out of the box. -//! -//! Additionally, Serde provides a procedural macro called [`serde_derive`] to -//! automatically generate [`Deserialize`] implementations for structs and enums -//! in your program. See the [derive section of the manual] for how to use this. -//! -//! In rare cases it may be necessary to implement [`Deserialize`] manually for -//! some type in your program. See the [Implementing `Deserialize`] section of -//! the manual for more about this. -//! -//! Third-party crates may provide [`Deserialize`] implementations for types -//! that they expose. For example the [`linked-hash-map`] crate provides a -//! [`LinkedHashMap<K, V>`] type that is deserializable by Serde because the -//! crate provides an implementation of [`Deserialize`] for it. -//! -//! # The Deserializer trait -//! -//! [`Deserializer`] implementations are provided by third-party crates, for -//! example [`serde_json`], [`serde_yaml`] and [`postcard`]. -//! -//! A partial list of well-maintained formats is given on the [Serde -//! website][data formats]. -//! -//! # Implementations of Deserialize provided by Serde -//! -//! This is a slightly different set of types than what is supported for -//! serialization. Some types can be serialized by Serde but not deserialized. -//! One example is `OsStr`. -//! -//! - **Primitive types**: -//! - bool -//! - i8, i16, i32, i64, i128, isize -//! - u8, u16, u32, u64, u128, usize -//! - f32, f64 -//! - char -//! - **Compound types**: -//! - \[T; 0\] through \[T; 32\] -//! - tuples up to size 16 -//! - **Common standard library types**: -//! - String -//! - Option\<T\> -//! - Result\<T, E\> -//! - PhantomData\<T\> -//! - **Wrapper types**: -//! - Box\<T\> -//! - Box\<\[T\]\> -//! - Box\<str\> -//! - Cow\<'a, T\> -//! - Cell\<T\> -//! - RefCell\<T\> -//! - Mutex\<T\> -//! - RwLock\<T\> -//! - Rc\<T\> *(if* features = \["rc"\] *is enabled)* -//! - Arc\<T\> *(if* features = \["rc"\] *is enabled)* -//! - **Collection types**: -//! - BTreeMap\<K, V\> -//! - BTreeSet\<T\> -//! - BinaryHeap\<T\> -//! - HashMap\<K, V, H\> -//! - HashSet\<T, H\> -//! - LinkedList\<T\> -//! - VecDeque\<T\> -//! - Vec\<T\> -//! - **Zero-copy types**: -//! - &str -//! - &\[u8\] -//! - **FFI types**: -//! - CString -//! - Box\<CStr\> -//! - OsString -//! - **Miscellaneous standard library types**: -//! - Duration -//! - SystemTime -//! - Path -//! - PathBuf -//! - Range\<T\> -//! - RangeInclusive\<T\> -//! - Bound\<T\> -//! - num::NonZero* -//! - `!` *(unstable)* -//! - **Net types**: -//! - IpAddr -//! - Ipv4Addr -//! - Ipv6Addr -//! - SocketAddr -//! - SocketAddrV4 -//! - SocketAddrV6 -//! -//! [Implementing `Deserialize`]: https://serde.rs/impl-deserialize.html -//! [`Deserialize`]: ../trait.Deserialize.html -//! [`Deserializer`]: ../trait.Deserializer.html -//! [`LinkedHashMap<K, V>`]: https://docs.rs/linked-hash-map/*/linked_hash_map/struct.LinkedHashMap.html -//! [`postcard`]: https://github.com/jamesmunns/postcard -//! [`linked-hash-map`]: https://crates.io/crates/linked-hash-map -//! [`serde_derive`]: https://crates.io/crates/serde_derive -//! [`serde_json`]: https://github.com/serde-rs/json -//! [`serde_yaml`]: https://github.com/dtolnay/serde-yaml -//! [derive section of the manual]: https://serde.rs/derive.html -//! [data formats]: https://serde.rs/#data-formats - -use crate::lib::*; - -//////////////////////////////////////////////////////////////////////////////// - -pub mod value; - -mod format; -mod ignored_any; -mod impls; -pub(crate) mod size_hint; - -pub use self::ignored_any::IgnoredAny; - -#[cfg(not(any(feature = "std", feature = "unstable")))] -#[doc(no_inline)] -pub use crate::std_error::Error as StdError; -#[cfg(all(feature = "unstable", not(feature = "std")))] -#[doc(no_inline)] -pub use core::error::Error as StdError; -#[cfg(feature = "std")] -#[doc(no_inline)] -pub use std::error::Error as StdError; - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! declare_error_trait { - (Error: Sized $(+ $($supertrait:ident)::+)*) => { - /// The `Error` trait allows `Deserialize` implementations to create descriptive - /// error messages belonging to the `Deserializer` against which they are - /// currently running. - /// - /// Every `Deserializer` declares an `Error` type that encompasses both - /// general-purpose deserialization errors as well as errors specific to the - /// particular deserialization format. For example the `Error` type of - /// `serde_json` can represent errors like an invalid JSON escape sequence or an - /// unterminated string literal, in addition to the error cases that are part of - /// this trait. - /// - /// Most deserializers should only need to provide the `Error::custom` method - /// and inherit the default behavior for the other methods. - /// - /// # Example implementation - /// - /// The [example data format] presented on the website shows an error - /// type appropriate for a basic JSON data format. - /// - /// [example data format]: https://serde.rs/data-format.html - pub trait Error: Sized $(+ $($supertrait)::+)* { - /// Raised when there is general error when deserializing a type. - /// - /// The message should not be capitalized and should not end with a period. - /// - /// ```edition2021 - /// # use std::str::FromStr; - /// # - /// # struct IpAddr; - /// # - /// # impl FromStr for IpAddr { - /// # type Err = String; - /// # - /// # fn from_str(_: &str) -> Result<Self, String> { - /// # unimplemented!() - /// # } - /// # } - /// # - /// use serde::de::{self, Deserialize, Deserializer}; - /// - /// impl<'de> Deserialize<'de> for IpAddr { - /// fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - /// where - /// D: Deserializer<'de>, - /// { - /// let s = String::deserialize(deserializer)?; - /// s.parse().map_err(de::Error::custom) - /// } - /// } - /// ``` - fn custom<T>(msg: T) -> Self - where - T: Display; - - /// Raised when a `Deserialize` receives a type different from what it was - /// expecting. - /// - /// The `unexp` argument provides information about what type was received. - /// This is the type that was present in the input file or other source data - /// of the Deserializer. - /// - /// The `exp` argument provides information about what type was being - /// expected. This is the type that is written in the program. - /// - /// For example if we try to deserialize a String out of a JSON file - /// containing an integer, the unexpected type is the integer and the - /// expected type is the string. - #[cold] - fn invalid_type(unexp: Unexpected, exp: &Expected) -> Self { - Error::custom(format_args!("invalid type: {}, expected {}", unexp, exp)) - } - - /// Raised when a `Deserialize` receives a value of the right type but that - /// is wrong for some other reason. - /// - /// The `unexp` argument provides information about what value was received. - /// This is the value that was present in the input file or other source - /// data of the Deserializer. - /// - /// The `exp` argument provides information about what value was being - /// expected. This is the type that is written in the program. - /// - /// For example if we try to deserialize a String out of some binary data - /// that is not valid UTF-8, the unexpected value is the bytes and the - /// expected value is a string. - #[cold] - fn invalid_value(unexp: Unexpected, exp: &Expected) -> Self { - Error::custom(format_args!("invalid value: {}, expected {}", unexp, exp)) - } - - /// Raised when deserializing a sequence or map and the input data contains - /// too many or too few elements. - /// - /// The `len` argument is the number of elements encountered. The sequence - /// or map may have expected more arguments or fewer arguments. - /// - /// The `exp` argument provides information about what data was being - /// expected. For example `exp` might say that a tuple of size 6 was - /// expected. - #[cold] - fn invalid_length(len: usize, exp: &Expected) -> Self { - Error::custom(format_args!("invalid length {}, expected {}", len, exp)) - } - - /// Raised when a `Deserialize` enum type received a variant with an - /// unrecognized name. - #[cold] - fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self { - if expected.is_empty() { - Error::custom(format_args!( - "unknown variant `{}`, there are no variants", - variant - )) - } else { - Error::custom(format_args!( - "unknown variant `{}`, expected {}", - variant, - OneOf { names: expected } - )) - } - } - - /// Raised when a `Deserialize` struct type received a field with an - /// unrecognized name. - #[cold] - fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self { - if expected.is_empty() { - Error::custom(format_args!( - "unknown field `{}`, there are no fields", - field - )) - } else { - Error::custom(format_args!( - "unknown field `{}`, expected {}", - field, - OneOf { names: expected } - )) - } - } - - /// Raised when a `Deserialize` struct type expected to receive a required - /// field with a particular name but that field was not present in the - /// input. - #[cold] - fn missing_field(field: &'static str) -> Self { - Error::custom(format_args!("missing field `{}`", field)) - } - - /// Raised when a `Deserialize` struct type received more than one of the - /// same field. - #[cold] - fn duplicate_field(field: &'static str) -> Self { - Error::custom(format_args!("duplicate field `{}`", field)) - } - } - } -} - -#[cfg(feature = "std")] -declare_error_trait!(Error: Sized + StdError); - -#[cfg(not(feature = "std"))] -declare_error_trait!(Error: Sized + Debug + Display); - -/// `Unexpected` represents an unexpected invocation of any one of the `Visitor` -/// trait methods. -/// -/// This is used as an argument to the `invalid_type`, `invalid_value`, and -/// `invalid_length` methods of the `Error` trait to build error messages. -/// -/// ```edition2021 -/// # use std::fmt; -/// # -/// # use serde::de::{self, Unexpected, Visitor}; -/// # -/// # struct Example; -/// # -/// # impl<'de> Visitor<'de> for Example { -/// # type Value = (); -/// # -/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// # write!(formatter, "definitely not a boolean") -/// # } -/// # -/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> -/// where -/// E: de::Error, -/// { -/// Err(de::Error::invalid_type(Unexpected::Bool(v), &self)) -/// } -/// # } -/// ``` -#[derive(Copy, Clone, PartialEq, Debug)] -pub enum Unexpected<'a> { - /// The input contained a boolean value that was not expected. - Bool(bool), - - /// The input contained an unsigned integer `u8`, `u16`, `u32` or `u64` that - /// was not expected. - Unsigned(u64), - - /// The input contained a signed integer `i8`, `i16`, `i32` or `i64` that - /// was not expected. - Signed(i64), - - /// The input contained a floating point `f32` or `f64` that was not - /// expected. - Float(f64), - - /// The input contained a `char` that was not expected. - Char(char), - - /// The input contained a `&str` or `String` that was not expected. - Str(&'a str), - - /// The input contained a `&[u8]` or `Vec<u8>` that was not expected. - Bytes(&'a [u8]), - - /// The input contained a unit `()` that was not expected. - Unit, - - /// The input contained an `Option<T>` that was not expected. - Option, - - /// The input contained a newtype struct that was not expected. - NewtypeStruct, - - /// The input contained a sequence that was not expected. - Seq, - - /// The input contained a map that was not expected. - Map, - - /// The input contained an enum that was not expected. - Enum, - - /// The input contained a unit variant that was not expected. - UnitVariant, - - /// The input contained a newtype variant that was not expected. - NewtypeVariant, - - /// The input contained a tuple variant that was not expected. - TupleVariant, - - /// The input contained a struct variant that was not expected. - StructVariant, - - /// A message stating what uncategorized thing the input contained that was - /// not expected. - /// - /// The message should be a noun or noun phrase, not capitalized and without - /// a period. An example message is "unoriginal superhero". - Other(&'a str), -} - -impl<'a> fmt::Display for Unexpected<'a> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - use self::Unexpected::*; - match *self { - Bool(b) => write!(formatter, "boolean `{}`", b), - Unsigned(i) => write!(formatter, "integer `{}`", i), - Signed(i) => write!(formatter, "integer `{}`", i), - Float(f) => write!(formatter, "floating point `{}`", f), - Char(c) => write!(formatter, "character `{}`", c), - Str(s) => write!(formatter, "string {:?}", s), - Bytes(_) => write!(formatter, "byte array"), - Unit => write!(formatter, "unit value"), - Option => write!(formatter, "Option value"), - NewtypeStruct => write!(formatter, "newtype struct"), - Seq => write!(formatter, "sequence"), - Map => write!(formatter, "map"), - Enum => write!(formatter, "enum"), - UnitVariant => write!(formatter, "unit variant"), - NewtypeVariant => write!(formatter, "newtype variant"), - TupleVariant => write!(formatter, "tuple variant"), - StructVariant => write!(formatter, "struct variant"), - Other(other) => formatter.write_str(other), - } - } -} - -/// `Expected` represents an explanation of what data a `Visitor` was expecting -/// to receive. -/// -/// This is used as an argument to the `invalid_type`, `invalid_value`, and -/// `invalid_length` methods of the `Error` trait to build error messages. The -/// message should be a noun or noun phrase that completes the sentence "This -/// Visitor expects to receive ...", for example the message could be "an -/// integer between 0 and 64". The message should not be capitalized and should -/// not end with a period. -/// -/// Within the context of a `Visitor` implementation, the `Visitor` itself -/// (`&self`) is an implementation of this trait. -/// -/// ```edition2021 -/// # use serde::de::{self, Unexpected, Visitor}; -/// # use std::fmt; -/// # -/// # struct Example; -/// # -/// # impl<'de> Visitor<'de> for Example { -/// # type Value = (); -/// # -/// # fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// # write!(formatter, "definitely not a boolean") -/// # } -/// # -/// fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> -/// where -/// E: de::Error, -/// { -/// Err(de::Error::invalid_type(Unexpected::Bool(v), &self)) -/// } -/// # } -/// ``` -/// -/// Outside of a `Visitor`, `&"..."` can be used. -/// -/// ```edition2021 -/// # use serde::de::{self, Unexpected}; -/// # -/// # fn example<E>() -> Result<(), E> -/// # where -/// # E: de::Error, -/// # { -/// # let v = true; -/// return Err(de::Error::invalid_type( -/// Unexpected::Bool(v), -/// &"a negative integer", -/// )); -/// # } -/// ``` -pub trait Expected { - /// Format an explanation of what data was being expected. Same signature as - /// the `Display` and `Debug` traits. - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result; -} - -impl<'de, T> Expected for T -where - T: Visitor<'de>, -{ - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - self.expecting(formatter) - } -} - -impl<'a> Expected for &'a str { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(self) - } -} - -impl<'a> Display for Expected + 'a { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - Expected::fmt(self, formatter) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A **data structure** that can be deserialized from any data format supported -/// by Serde. -/// -/// Serde provides `Deserialize` implementations for many Rust primitive and -/// standard library types. The complete list is [here][crate::de]. All of these -/// can be deserialized using Serde out of the box. -/// -/// Additionally, Serde provides a procedural macro called `serde_derive` to -/// automatically generate `Deserialize` implementations for structs and enums -/// in your program. See the [derive section of the manual][derive] for how to -/// use this. -/// -/// In rare cases it may be necessary to implement `Deserialize` manually for -/// some type in your program. See the [Implementing -/// `Deserialize`][impl-deserialize] section of the manual for more about this. -/// -/// Third-party crates may provide `Deserialize` implementations for types that -/// they expose. For example the `linked-hash-map` crate provides a -/// `LinkedHashMap<K, V>` type that is deserializable by Serde because the crate -/// provides an implementation of `Deserialize` for it. -/// -/// [derive]: https://serde.rs/derive.html -/// [impl-deserialize]: https://serde.rs/impl-deserialize.html -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by `Self` when deserialized. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -pub trait Deserialize<'de>: Sized { - /// Deserialize this value from the given Serde deserializer. - /// - /// See the [Implementing `Deserialize`][impl-deserialize] section of the - /// manual for more information about how to implement this method. - /// - /// [impl-deserialize]: https://serde.rs/impl-deserialize.html - fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>; - - /// Deserializes a value into `self` from the given Deserializer. - /// - /// The purpose of this method is to allow the deserializer to reuse - /// resources and avoid copies. As such, if this method returns an error, - /// `self` will be in an indeterminate state where some parts of the struct - /// have been overwritten. Although whatever state that is will be - /// memory-safe. - /// - /// This is generally useful when repeatedly deserializing values that - /// are processed one at a time, where the value of `self` doesn't matter - /// when the next deserialization occurs. - /// - /// If you manually implement this, your recursive deserializations should - /// use `deserialize_in_place`. - /// - /// This method is stable and an official public API, but hidden from the - /// documentation because it is almost never what newbies are looking for. - /// Showing it in rustdoc would cause it to be featured more prominently - /// than it deserves. - #[doc(hidden)] - fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error> - where - D: Deserializer<'de>, - { - // Default implementation just delegates to `deserialize` impl. - *place = tri!(Deserialize::deserialize(deserializer)); - Ok(()) - } -} - -/// A data structure that can be deserialized without borrowing any data from -/// the deserializer. -/// -/// This is primarily useful for trait bounds on functions. For example a -/// `from_str` function may be able to deserialize a data structure that borrows -/// from the input string, but a `from_reader` function may only deserialize -/// owned data. -/// -/// ```edition2021 -/// # use serde::de::{Deserialize, DeserializeOwned}; -/// # use std::io::{Read, Result}; -/// # -/// # trait Ignore { -/// fn from_str<'a, T>(s: &'a str) -> Result<T> -/// where -/// T: Deserialize<'a>; -/// -/// fn from_reader<R, T>(rdr: R) -> Result<T> -/// where -/// R: Read, -/// T: DeserializeOwned; -/// # } -/// ``` -/// -/// # Lifetime -/// -/// The relationship between `Deserialize` and `DeserializeOwned` in trait -/// bounds is explained in more detail on the page [Understanding deserializer -/// lifetimes]. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -pub trait DeserializeOwned: for<'de> Deserialize<'de> {} -impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {} - -/// `DeserializeSeed` is the stateful form of the `Deserialize` trait. If you -/// ever find yourself looking for a way to pass data into a `Deserialize` impl, -/// this trait is the way to do it. -/// -/// As one example of stateful deserialization consider deserializing a JSON -/// array into an existing buffer. Using the `Deserialize` trait we could -/// deserialize a JSON array into a `Vec<T>` but it would be a freshly allocated -/// `Vec<T>`; there is no way for `Deserialize` to reuse a previously allocated -/// buffer. Using `DeserializeSeed` instead makes this possible as in the -/// example code below. -/// -/// The canonical API for stateless deserialization looks like this: -/// -/// ```edition2021 -/// # use serde::Deserialize; -/// # -/// # enum Error {} -/// # -/// fn func<'de, T: Deserialize<'de>>() -> Result<T, Error> -/// # { -/// # unimplemented!() -/// # } -/// ``` -/// -/// Adjusting an API like this to support stateful deserialization is a matter -/// of accepting a seed as input: -/// -/// ```edition2021 -/// # use serde::de::DeserializeSeed; -/// # -/// # enum Error {} -/// # -/// fn func_seed<'de, T: DeserializeSeed<'de>>(seed: T) -> Result<T::Value, Error> -/// # { -/// # let _ = seed; -/// # unimplemented!() -/// # } -/// ``` -/// -/// In practice the majority of deserialization is stateless. An API expecting a -/// seed can be appeased by passing `std::marker::PhantomData` as a seed in the -/// case of stateless deserialization. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by `Self::Value` when deserialized. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example -/// -/// Suppose we have JSON that looks like `[[1, 2], [3, 4, 5], [6]]` and we need -/// to deserialize it into a flat representation like `vec![1, 2, 3, 4, 5, 6]`. -/// Allocating a brand new `Vec<T>` for each subarray would be slow. Instead we -/// would like to allocate a single `Vec<T>` and then deserialize each subarray -/// into it. This requires stateful deserialization using the `DeserializeSeed` -/// trait. -/// -/// ```edition2021 -/// use serde::de::{Deserialize, DeserializeSeed, Deserializer, SeqAccess, Visitor}; -/// use std::fmt; -/// use std::marker::PhantomData; -/// -/// // A DeserializeSeed implementation that uses stateful deserialization to -/// // append array elements onto the end of an existing vector. The preexisting -/// // state ("seed") in this case is the Vec<T>. The `deserialize` method of -/// // `ExtendVec` will be traversing the inner arrays of the JSON input and -/// // appending each integer into the existing Vec. -/// struct ExtendVec<'a, T: 'a>(&'a mut Vec<T>); -/// -/// impl<'de, 'a, T> DeserializeSeed<'de> for ExtendVec<'a, T> -/// where -/// T: Deserialize<'de>, -/// { -/// // The return type of the `deserialize` method. This implementation -/// // appends onto an existing vector but does not create any new data -/// // structure, so the return type is (). -/// type Value = (); -/// -/// fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> -/// where -/// D: Deserializer<'de>, -/// { -/// // Visitor implementation that will walk an inner array of the JSON -/// // input. -/// struct ExtendVecVisitor<'a, T: 'a>(&'a mut Vec<T>); -/// -/// impl<'de, 'a, T> Visitor<'de> for ExtendVecVisitor<'a, T> -/// where -/// T: Deserialize<'de>, -/// { -/// type Value = (); -/// -/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// write!(formatter, "an array of integers") -/// } -/// -/// fn visit_seq<A>(self, mut seq: A) -> Result<(), A::Error> -/// where -/// A: SeqAccess<'de>, -/// { -/// // Decrease the number of reallocations if there are many elements -/// if let Some(size_hint) = seq.size_hint() { -/// self.0.reserve(size_hint); -/// } -/// -/// // Visit each element in the inner array and push it onto -/// // the existing vector. -/// while let Some(elem) = seq.next_element()? { -/// self.0.push(elem); -/// } -/// Ok(()) -/// } -/// } -/// -/// deserializer.deserialize_seq(ExtendVecVisitor(self.0)) -/// } -/// } -/// -/// // Visitor implementation that will walk the outer array of the JSON input. -/// struct FlattenedVecVisitor<T>(PhantomData<T>); -/// -/// impl<'de, T> Visitor<'de> for FlattenedVecVisitor<T> -/// where -/// T: Deserialize<'de>, -/// { -/// // This Visitor constructs a single Vec<T> to hold the flattened -/// // contents of the inner arrays. -/// type Value = Vec<T>; -/// -/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// write!(formatter, "an array of arrays") -/// } -/// -/// fn visit_seq<A>(self, mut seq: A) -> Result<Vec<T>, A::Error> -/// where -/// A: SeqAccess<'de>, -/// { -/// // Create a single Vec to hold the flattened contents. -/// let mut vec = Vec::new(); -/// -/// // Each iteration through this loop is one inner array. -/// while let Some(()) = seq.next_element_seed(ExtendVec(&mut vec))? { -/// // Nothing to do; inner array has been appended into `vec`. -/// } -/// -/// // Return the finished vec. -/// Ok(vec) -/// } -/// } -/// -/// # fn example<'de, D>(deserializer: D) -> Result<(), D::Error> -/// # where -/// # D: Deserializer<'de>, -/// # { -/// let visitor = FlattenedVecVisitor(PhantomData); -/// let flattened: Vec<u64> = deserializer.deserialize_seq(visitor)?; -/// # Ok(()) -/// # } -/// ``` -pub trait DeserializeSeed<'de>: Sized { - /// The type produced by using this seed. - type Value; - - /// Equivalent to the more common `Deserialize::deserialize` method, except - /// with some initial piece of data (the seed) passed in. - fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>; -} - -impl<'de, T> DeserializeSeed<'de> for PhantomData<T> -where - T: Deserialize<'de>, -{ - type Value = T; - - #[inline] - fn deserialize<D>(self, deserializer: D) -> Result<T, D::Error> - where - D: Deserializer<'de>, - { - T::deserialize(deserializer) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A **data format** that can deserialize any data structure supported by -/// Serde. -/// -/// The role of this trait is to define the deserialization half of the [Serde -/// data model], which is a way to categorize every Rust data type into one of -/// 29 possible types. Each method of the `Deserializer` trait corresponds to one -/// of the types of the data model. -/// -/// Implementations of `Deserialize` map themselves into this data model by -/// passing to the `Deserializer` a `Visitor` implementation that can receive -/// these various types. -/// -/// The types that make up the Serde data model are: -/// -/// - **14 primitive types** -/// - bool -/// - i8, i16, i32, i64, i128 -/// - u8, u16, u32, u64, u128 -/// - f32, f64 -/// - char -/// - **string** -/// - UTF-8 bytes with a length and no null terminator. -/// - When serializing, all strings are handled equally. When deserializing, -/// there are three flavors of strings: transient, owned, and borrowed. -/// - **byte array** - \[u8\] -/// - Similar to strings, during deserialization byte arrays can be -/// transient, owned, or borrowed. -/// - **option** -/// - Either none or some value. -/// - **unit** -/// - The type of `()` in Rust. It represents an anonymous value containing -/// no data. -/// - **unit_struct** -/// - For example `struct Unit` or `PhantomData<T>`. It represents a named -/// value containing no data. -/// - **unit_variant** -/// - For example the `E::A` and `E::B` in `enum E { A, B }`. -/// - **newtype_struct** -/// - For example `struct Millimeters(u8)`. -/// - **newtype_variant** -/// - For example the `E::N` in `enum E { N(u8) }`. -/// - **seq** -/// - A variably sized heterogeneous sequence of values, for example `Vec<T>` -/// or `HashSet<T>`. When serializing, the length may or may not be known -/// before iterating through all the data. When deserializing, the length -/// is determined by looking at the serialized data. -/// - **tuple** -/// - A statically sized heterogeneous sequence of values for which the -/// length will be known at deserialization time without looking at the -/// serialized data, for example `(u8,)` or `(String, u64, Vec<T>)` or -/// `[u64; 10]`. -/// - **tuple_struct** -/// - A named tuple, for example `struct Rgb(u8, u8, u8)`. -/// - **tuple_variant** -/// - For example the `E::T` in `enum E { T(u8, u8) }`. -/// - **map** -/// - A heterogeneous key-value pairing, for example `BTreeMap<K, V>`. -/// - **struct** -/// - A heterogeneous key-value pairing in which the keys are strings and -/// will be known at deserialization time without looking at the serialized -/// data, for example `struct S { r: u8, g: u8, b: u8 }`. -/// - **struct_variant** -/// - For example the `E::S` in `enum E { S { r: u8, g: u8, b: u8 } }`. -/// -/// The `Deserializer` trait supports two entry point styles which enables -/// different kinds of deserialization. -/// -/// 1. The `deserialize_any` method. Self-describing data formats like JSON are -/// able to look at the serialized data and tell what it represents. For -/// example the JSON deserializer may see an opening curly brace (`{`) and -/// know that it is seeing a map. If the data format supports -/// `Deserializer::deserialize_any`, it will drive the Visitor using whatever -/// type it sees in the input. JSON uses this approach when deserializing -/// `serde_json::Value` which is an enum that can represent any JSON -/// document. Without knowing what is in a JSON document, we can deserialize -/// it to `serde_json::Value` by going through -/// `Deserializer::deserialize_any`. -/// -/// 2. The various `deserialize_*` methods. Non-self-describing formats like -/// Postcard need to be told what is in the input in order to deserialize it. -/// The `deserialize_*` methods are hints to the deserializer for how to -/// interpret the next piece of input. Non-self-describing formats are not -/// able to deserialize something like `serde_json::Value` which relies on -/// `Deserializer::deserialize_any`. -/// -/// When implementing `Deserialize`, you should avoid relying on -/// `Deserializer::deserialize_any` unless you need to be told by the -/// Deserializer what type is in the input. Know that relying on -/// `Deserializer::deserialize_any` means your data type will be able to -/// deserialize from self-describing formats only, ruling out Postcard and many -/// others. -/// -/// [Serde data model]: https://serde.rs/data-model.html -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed from the input when deserializing. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example implementation -/// -/// The [example data format] presented on the website contains example code for -/// a basic JSON `Deserializer`. -/// -/// [example data format]: https://serde.rs/data-format.html -pub trait Deserializer<'de>: Sized { - /// The error type that can be returned if some error occurs during - /// deserialization. - type Error: Error; - - /// Require the `Deserializer` to figure out how to drive the visitor based - /// on what data type is in the input. - /// - /// When implementing `Deserialize`, you should avoid relying on - /// `Deserializer::deserialize_any` unless you need to be told by the - /// Deserializer what type is in the input. Know that relying on - /// `Deserializer::deserialize_any` means your data type will be able to - /// deserialize from self-describing formats only, ruling out Postcard and - /// many others. - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `bool` value. - fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `i8` value. - fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `i16` value. - fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `i32` value. - fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `i64` value. - fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `i128` value. - /// - /// The default behavior unconditionally returns an error. - fn deserialize_i128<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - let _ = visitor; - Err(Error::custom("i128 is not supported")) - } - - /// Hint that the `Deserialize` type is expecting a `u8` value. - fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `u16` value. - fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `u32` value. - fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `u64` value. - fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an `u128` value. - /// - /// The default behavior unconditionally returns an error. - fn deserialize_u128<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - let _ = visitor; - Err(Error::custom("u128 is not supported")) - } - - /// Hint that the `Deserialize` type is expecting a `f32` value. - fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `f64` value. - fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a `char` value. - fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a string value and does - /// not benefit from taking ownership of buffered data owned by the - /// `Deserializer`. - /// - /// If the `Visitor` would benefit from taking ownership of `String` data, - /// indicate this to the `Deserializer` by using `deserialize_string` - /// instead. - fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a string value and would - /// benefit from taking ownership of buffered data owned by the - /// `Deserializer`. - /// - /// If the `Visitor` would not benefit from taking ownership of `String` - /// data, indicate that to the `Deserializer` by using `deserialize_str` - /// instead. - fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a byte array and does not - /// benefit from taking ownership of buffered data owned by the - /// `Deserializer`. - /// - /// If the `Visitor` would benefit from taking ownership of `Vec<u8>` data, - /// indicate this to the `Deserializer` by using `deserialize_byte_buf` - /// instead. - fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a byte array and would - /// benefit from taking ownership of buffered data owned by the - /// `Deserializer`. - /// - /// If the `Visitor` would not benefit from taking ownership of `Vec<u8>` - /// data, indicate that to the `Deserializer` by using `deserialize_bytes` - /// instead. - fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an optional value. - /// - /// This allows deserializers that encode an optional value as a nullable - /// value to convert the null value into `None` and a regular value into - /// `Some(value)`. - fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a unit value. - fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a unit struct with a - /// particular name. - fn deserialize_unit_struct<V>( - self, - name: &'static str, - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a newtype struct with a - /// particular name. - fn deserialize_newtype_struct<V>( - self, - name: &'static str, - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a sequence of values. - fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> - 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<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a tuple struct with a - /// particular name and number of fields. - fn deserialize_tuple_struct<V>( - self, - name: &'static str, - len: usize, - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a map of key-value pairs. - fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting a struct with a particular - /// name and fields. - fn deserialize_struct<V>( - self, - name: &'static str, - fields: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting an enum value with a - /// particular name and possible variants. - fn deserialize_enum<V>( - self, - name: &'static str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type is expecting the name of a struct - /// field or the discriminant of an enum variant. - fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Hint that the `Deserialize` type needs to deserialize a value whose type - /// doesn't matter because it is ignored. - /// - /// Deserializers for non-self-describing formats may not support this mode. - fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Determine whether `Deserialize` implementations should expect to - /// deserialize their human-readable form. - /// - /// Some types have a human-readable form that may be somewhat expensive to - /// construct, as well as a binary form that is compact and efficient. - /// Generally text-based formats like JSON and YAML will prefer to use the - /// human-readable one and binary formats like Postcard will prefer the - /// compact one. - /// - /// ```edition2021 - /// # use std::ops::Add; - /// # use std::str::FromStr; - /// # - /// # struct Timestamp; - /// # - /// # impl Timestamp { - /// # const EPOCH: Timestamp = Timestamp; - /// # } - /// # - /// # impl FromStr for Timestamp { - /// # type Err = String; - /// # fn from_str(_: &str) -> Result<Self, Self::Err> { - /// # unimplemented!() - /// # } - /// # } - /// # - /// # struct Duration; - /// # - /// # impl Duration { - /// # fn seconds(_: u64) -> Self { unimplemented!() } - /// # } - /// # - /// # impl Add<Duration> for Timestamp { - /// # type Output = Timestamp; - /// # fn add(self, _: Duration) -> Self::Output { - /// # unimplemented!() - /// # } - /// # } - /// # - /// use serde::de::{self, Deserialize, Deserializer}; - /// - /// impl<'de> Deserialize<'de> for Timestamp { - /// fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> - /// where - /// D: Deserializer<'de>, - /// { - /// if deserializer.is_human_readable() { - /// // Deserialize from a human-readable string like "2015-05-15T17:01:00Z". - /// let s = String::deserialize(deserializer)?; - /// Timestamp::from_str(&s).map_err(de::Error::custom) - /// } else { - /// // Deserialize from a compact binary representation, seconds since - /// // the Unix epoch. - /// let n = u64::deserialize(deserializer)?; - /// Ok(Timestamp::EPOCH + Duration::seconds(n)) - /// } - /// } - /// } - /// ``` - /// - /// The default implementation of this method returns `true`. Data formats - /// may override this to `false` to request a compact form for types that - /// support one. Note that modifying this method to change a format from - /// human-readable to compact or vice versa should be regarded as a breaking - /// change, as a value serialized in human-readable mode is not required to - /// deserialize from the same data in compact mode. - #[inline] - fn is_human_readable(&self) -> bool { - true - } - - // Not public API. - #[cfg(all(not(no_serde_derive), any(feature = "std", feature = "alloc")))] - #[doc(hidden)] - fn __deserialize_content<V>( - self, - _: crate::actually_private::T, - visitor: V, - ) -> Result<crate::__private::de::Content<'de>, Self::Error> - where - V: Visitor<'de, Value = crate::__private::de::Content<'de>>, - { - self.deserialize_any(visitor) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// This trait represents a visitor that walks through a deserializer. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the requirement for lifetime of data -/// that may be borrowed by `Self::Value`. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example -/// -/// ```edition2021 -/// # use serde::de::{self, Unexpected, Visitor}; -/// # use std::fmt; -/// # -/// /// A visitor that deserializes a long string - a string containing at least -/// /// some minimum number of bytes. -/// struct LongString { -/// min: usize, -/// } -/// -/// impl<'de> Visitor<'de> for LongString { -/// type Value = String; -/// -/// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { -/// write!(formatter, "a string containing at least {} bytes", self.min) -/// } -/// -/// fn visit_str<E>(self, s: &str) -> Result<Self::Value, E> -/// where -/// E: de::Error, -/// { -/// if s.len() >= self.min { -/// Ok(s.to_owned()) -/// } else { -/// Err(de::Error::invalid_value(Unexpected::Str(s), &self)) -/// } -/// } -/// } -/// ``` -pub trait Visitor<'de>: Sized { - /// The value produced by this visitor. - type Value; - - /// Format a message stating what data this Visitor expects to receive. - /// - /// This is used in error messages. The message should complete the sentence - /// "This Visitor expects to receive ...", for example the message could be - /// "an integer between 0 and 64". The message should not be capitalized and - /// should not end with a period. - /// - /// ```edition2021 - /// # use std::fmt; - /// # - /// # struct S { - /// # max: usize, - /// # } - /// # - /// # impl<'de> serde::de::Visitor<'de> for S { - /// # type Value = (); - /// # - /// fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - /// write!(formatter, "an integer between 0 and {}", self.max) - /// } - /// # } - /// ``` - fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result; - - /// The input contains a boolean. - /// - /// The default implementation fails with a type error. - fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Bool(v), &self)) - } - - /// The input contains an `i8`. - /// - /// The default implementation forwards to [`visit_i64`]. - /// - /// [`visit_i64`]: #method.visit_i64 - fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_i64(v as i64) - } - - /// The input contains an `i16`. - /// - /// The default implementation forwards to [`visit_i64`]. - /// - /// [`visit_i64`]: #method.visit_i64 - fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_i64(v as i64) - } - - /// The input contains an `i32`. - /// - /// The default implementation forwards to [`visit_i64`]. - /// - /// [`visit_i64`]: #method.visit_i64 - fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_i64(v as i64) - } - - /// The input contains an `i64`. - /// - /// The default implementation fails with a type error. - fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Signed(v), &self)) - } - - /// The input contains a `i128`. - /// - /// The default implementation fails with a type error. - fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E> - where - E: Error, - { - let mut buf = [0u8; 58]; - let mut writer = format::Buf::new(&mut buf); - fmt::Write::write_fmt(&mut writer, format_args!("integer `{}` as i128", v)).unwrap(); - Err(Error::invalid_type( - Unexpected::Other(writer.as_str()), - &self, - )) - } - - /// The input contains a `u8`. - /// - /// The default implementation forwards to [`visit_u64`]. - /// - /// [`visit_u64`]: #method.visit_u64 - fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_u64(v as u64) - } - - /// The input contains a `u16`. - /// - /// The default implementation forwards to [`visit_u64`]. - /// - /// [`visit_u64`]: #method.visit_u64 - fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_u64(v as u64) - } - - /// The input contains a `u32`. - /// - /// The default implementation forwards to [`visit_u64`]. - /// - /// [`visit_u64`]: #method.visit_u64 - fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_u64(v as u64) - } - - /// The input contains a `u64`. - /// - /// The default implementation fails with a type error. - fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Unsigned(v), &self)) - } - - /// The input contains a `u128`. - /// - /// The default implementation fails with a type error. - fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E> - where - E: Error, - { - let mut buf = [0u8; 57]; - let mut writer = format::Buf::new(&mut buf); - fmt::Write::write_fmt(&mut writer, format_args!("integer `{}` as u128", v)).unwrap(); - Err(Error::invalid_type( - Unexpected::Other(writer.as_str()), - &self, - )) - } - - /// The input contains an `f32`. - /// - /// The default implementation forwards to [`visit_f64`]. - /// - /// [`visit_f64`]: #method.visit_f64 - fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_f64(v as f64) - } - - /// The input contains an `f64`. - /// - /// The default implementation fails with a type error. - fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Float(v), &self)) - } - - /// The input contains a `char`. - /// - /// The default implementation forwards to [`visit_str`] as a one-character - /// string. - /// - /// [`visit_str`]: #method.visit_str - #[inline] - fn visit_char<E>(self, v: char) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_str(v.encode_utf8(&mut [0u8; 4])) - } - - /// The input contains a string. The lifetime of the string is ephemeral and - /// it may be destroyed after this method returns. - /// - /// This method allows the `Deserializer` to avoid a copy by retaining - /// ownership of any buffered data. `Deserialize` implementations that do - /// not benefit from taking ownership of `String` data should indicate that - /// to the deserializer by using `Deserializer::deserialize_str` rather than - /// `Deserializer::deserialize_string`. - /// - /// It is never correct to implement `visit_string` without implementing - /// `visit_str`. Implement neither, both, or just `visit_str`. - fn visit_str<E>(self, v: &str) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Str(v), &self)) - } - - /// The input contains a string that lives at least as long as the - /// `Deserializer`. - /// - /// This enables zero-copy deserialization of strings in some formats. For - /// example JSON input containing the JSON string `"borrowed"` can be - /// deserialized with zero copying into a `&'a str` as long as the input - /// data outlives `'a`. - /// - /// The default implementation forwards to `visit_str`. - #[inline] - fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_str(v) - } - - /// The input contains a string and ownership of the string is being given - /// to the `Visitor`. - /// - /// This method allows the `Visitor` to avoid a copy by taking ownership of - /// a string created by the `Deserializer`. `Deserialize` implementations - /// that benefit from taking ownership of `String` data should indicate that - /// to the deserializer by using `Deserializer::deserialize_string` rather - /// than `Deserializer::deserialize_str`, although not every deserializer - /// will honor such a request. - /// - /// It is never correct to implement `visit_string` without implementing - /// `visit_str`. Implement neither, both, or just `visit_str`. - /// - /// The default implementation forwards to `visit_str` and then drops the - /// `String`. - #[inline] - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - fn visit_string<E>(self, v: String) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_str(&v) - } - - /// The input contains a byte array. The lifetime of the byte array is - /// ephemeral and it may be destroyed after this method returns. - /// - /// This method allows the `Deserializer` to avoid a copy by retaining - /// ownership of any buffered data. `Deserialize` implementations that do - /// not benefit from taking ownership of `Vec<u8>` data should indicate that - /// to the deserializer by using `Deserializer::deserialize_bytes` rather - /// than `Deserializer::deserialize_byte_buf`. - /// - /// It is never correct to implement `visit_byte_buf` without implementing - /// `visit_bytes`. Implement neither, both, or just `visit_bytes`. - fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Bytes(v), &self)) - } - - /// The input contains a byte array that lives at least as long as the - /// `Deserializer`. - /// - /// This enables zero-copy deserialization of bytes in some formats. For - /// example Postcard data containing bytes can be deserialized with zero - /// copying into a `&'a [u8]` as long as the input data outlives `'a`. - /// - /// The default implementation forwards to `visit_bytes`. - #[inline] - fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_bytes(v) - } - - /// The input contains a byte array and ownership of the byte array is being - /// given to the `Visitor`. - /// - /// This method allows the `Visitor` to avoid a copy by taking ownership of - /// a byte buffer created by the `Deserializer`. `Deserialize` - /// implementations that benefit from taking ownership of `Vec<u8>` data - /// should indicate that to the deserializer by using - /// `Deserializer::deserialize_byte_buf` rather than - /// `Deserializer::deserialize_bytes`, although not every deserializer will - /// honor such a request. - /// - /// It is never correct to implement `visit_byte_buf` without implementing - /// `visit_bytes`. Implement neither, both, or just `visit_bytes`. - /// - /// The default implementation forwards to `visit_bytes` and then drops the - /// `Vec<u8>`. - #[cfg(any(feature = "std", feature = "alloc"))] - #[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] - fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E> - where - E: Error, - { - self.visit_bytes(&v) - } - - /// The input contains an optional that is absent. - /// - /// The default implementation fails with a type error. - fn visit_none<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Option, &self)) - } - - /// The input contains an optional that is present. - /// - /// The default implementation fails with a type error. - fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - let _ = deserializer; - Err(Error::invalid_type(Unexpected::Option, &self)) - } - - /// The input contains a unit `()`. - /// - /// The default implementation fails with a type error. - fn visit_unit<E>(self) -> Result<Self::Value, E> - where - E: Error, - { - Err(Error::invalid_type(Unexpected::Unit, &self)) - } - - /// The input contains a newtype struct. - /// - /// The content of the newtype struct may be read from the given - /// `Deserializer`. - /// - /// The default implementation fails with a type error. - fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - let _ = deserializer; - Err(Error::invalid_type(Unexpected::NewtypeStruct, &self)) - } - - /// The input contains a sequence of elements. - /// - /// The default implementation fails with a type error. - fn visit_seq<A>(self, seq: A) -> Result<Self::Value, A::Error> - where - A: SeqAccess<'de>, - { - let _ = seq; - Err(Error::invalid_type(Unexpected::Seq, &self)) - } - - /// The input contains a key-value map. - /// - /// The default implementation fails with a type error. - fn visit_map<A>(self, map: A) -> Result<Self::Value, A::Error> - where - A: MapAccess<'de>, - { - let _ = map; - Err(Error::invalid_type(Unexpected::Map, &self)) - } - - /// The input contains an enum. - /// - /// The default implementation fails with a type error. - fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error> - where - A: EnumAccess<'de>, - { - let _ = data; - Err(Error::invalid_type(Unexpected::Enum, &self)) - } - - // Used when deserializing a flattened Option field. Not public API. - #[doc(hidden)] - fn __private_visit_untagged_option<D>(self, _: D) -> Result<Self::Value, ()> - where - D: Deserializer<'de>, - { - Err(()) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// Provides a `Visitor` access to each element of a sequence in the input. -/// -/// This is a trait that a `Deserializer` passes to a `Visitor` implementation, -/// which deserializes each item in a sequence. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by deserialized sequence elements. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example implementation -/// -/// The [example data format] presented on the website demonstrates an -/// implementation of `SeqAccess` for a basic JSON data format. -/// -/// [example data format]: https://serde.rs/data-format.html -pub trait SeqAccess<'de> { - /// The error type that can be returned if some error occurs during - /// deserialization. - type Error: Error; - - /// This returns `Ok(Some(value))` for the next value in the sequence, or - /// `Ok(None)` if there are no more remaining items. - /// - /// `Deserialize` implementations should typically use - /// `SeqAccess::next_element` instead. - fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> - 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. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `SeqAccess` implementations should not override the default behavior. - #[inline] - fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error> - where - T: Deserialize<'de>, - { - self.next_element_seed(PhantomData) - } - - /// Returns the number of elements remaining in the sequence, if known. - #[inline] - fn size_hint(&self) -> Option<usize> { - None - } -} - -impl<'de, 'a, A: ?Sized> SeqAccess<'de> for &'a mut A -where - A: SeqAccess<'de>, -{ - type Error = A::Error; - - #[inline] - fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> - where - T: DeserializeSeed<'de>, - { - (**self).next_element_seed(seed) - } - - #[inline] - fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error> - where - T: Deserialize<'de>, - { - (**self).next_element() - } - - #[inline] - fn size_hint(&self) -> Option<usize> { - (**self).size_hint() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// Provides a `Visitor` access to each entry of a map in the input. -/// -/// This is a trait that a `Deserializer` passes to a `Visitor` implementation. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by deserialized map entries. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example implementation -/// -/// The [example data format] presented on the website demonstrates an -/// implementation of `MapAccess` for a basic JSON data format. -/// -/// [example data format]: https://serde.rs/data-format.html -pub trait MapAccess<'de> { - /// The error type that can be returned if some error occurs during - /// deserialization. - type Error: Error; - - /// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)` - /// if there are no more remaining entries. - /// - /// `Deserialize` implementations should typically use - /// `MapAccess::next_key` or `MapAccess::next_entry` instead. - fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error> - where - K: DeserializeSeed<'de>; - - /// This returns a `Ok(value)` for the next value in the map. - /// - /// `Deserialize` implementations should typically use - /// `MapAccess::next_value` instead. - /// - /// # Panics - /// - /// Calling `next_value_seed` before `next_key_seed` is incorrect and is - /// allowed to panic or return bogus results. - fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error> - where - 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. - /// - /// `MapAccess` implementations should override the default behavior if a - /// more efficient implementation is possible. - /// - /// `Deserialize` implementations should typically use - /// `MapAccess::next_entry` instead. - #[inline] - fn next_entry_seed<K, V>( - &mut self, - kseed: K, - vseed: V, - ) -> Result<Option<(K::Value, V::Value)>, Self::Error> - where - K: DeserializeSeed<'de>, - V: DeserializeSeed<'de>, - { - match tri!(self.next_key_seed(kseed)) { - Some(key) => { - let value = tri!(self.next_value_seed(vseed)); - Ok(Some((key, value))) - } - None => Ok(None), - } - } - - /// This returns `Ok(Some(key))` for the next key in the map, or `Ok(None)` - /// if there are no more remaining entries. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `MapAccess` implementations should not override the default behavior. - #[inline] - fn next_key<K>(&mut self) -> Result<Option<K>, Self::Error> - where - K: Deserialize<'de>, - { - self.next_key_seed(PhantomData) - } - - /// This returns a `Ok(value)` for the next value in the map. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `MapAccess` implementations should not override the default behavior. - /// - /// # Panics - /// - /// Calling `next_value` before `next_key` is incorrect and is allowed to - /// panic or return bogus results. - #[inline] - fn next_value<V>(&mut self) -> Result<V, Self::Error> - where - V: Deserialize<'de>, - { - self.next_value_seed(PhantomData) - } - - /// 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. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `MapAccess` implementations should not override the default behavior. - #[inline] - fn next_entry<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error> - where - K: Deserialize<'de>, - V: Deserialize<'de>, - { - self.next_entry_seed(PhantomData, PhantomData) - } - - /// Returns the number of entries remaining in the map, if known. - #[inline] - fn size_hint(&self) -> Option<usize> { - None - } -} - -impl<'de, 'a, A: ?Sized> MapAccess<'de> for &'a mut A -where - A: MapAccess<'de>, -{ - type Error = A::Error; - - #[inline] - fn next_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Self::Error> - where - K: DeserializeSeed<'de>, - { - (**self).next_key_seed(seed) - } - - #[inline] - fn next_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Self::Error> - where - V: DeserializeSeed<'de>, - { - (**self).next_value_seed(seed) - } - - #[inline] - fn next_entry_seed<K, V>( - &mut self, - kseed: K, - vseed: V, - ) -> Result<Option<(K::Value, V::Value)>, Self::Error> - where - K: DeserializeSeed<'de>, - V: DeserializeSeed<'de>, - { - (**self).next_entry_seed(kseed, vseed) - } - - #[inline] - fn next_entry<K, V>(&mut self) -> Result<Option<(K, V)>, Self::Error> - where - K: Deserialize<'de>, - V: Deserialize<'de>, - { - (**self).next_entry() - } - - #[inline] - fn next_key<K>(&mut self) -> Result<Option<K>, Self::Error> - where - K: Deserialize<'de>, - { - (**self).next_key() - } - - #[inline] - fn next_value<V>(&mut self) -> Result<V, Self::Error> - where - V: Deserialize<'de>, - { - (**self).next_value() - } - - #[inline] - fn size_hint(&self) -> Option<usize> { - (**self).size_hint() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// Provides a `Visitor` access to the data of an enum in the input. -/// -/// `EnumAccess` is created by the `Deserializer` and passed to the -/// `Visitor` in order to identify which variant of an enum to deserialize. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by the deserialized enum variant. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example implementation -/// -/// The [example data format] presented on the website demonstrates an -/// implementation of `EnumAccess` for a basic JSON data format. -/// -/// [example data format]: https://serde.rs/data-format.html -pub trait EnumAccess<'de>: Sized { - /// The error type that can be returned if some error occurs during - /// deserialization. - type Error: Error; - /// The `Visitor` that will be used to deserialize the content of the enum - /// variant. - type Variant: VariantAccess<'de, Error = Self::Error>; - - /// `variant` is called to identify which variant to deserialize. - /// - /// `Deserialize` implementations should typically use `EnumAccess::variant` - /// instead. - fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error> - where - V: DeserializeSeed<'de>; - - /// `variant` is called to identify which variant to deserialize. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `EnumAccess` implementations should not override the default behavior. - #[inline] - fn variant<V>(self) -> Result<(V, Self::Variant), Self::Error> - where - V: Deserialize<'de>, - { - self.variant_seed(PhantomData) - } -} - -/// `VariantAccess` is a visitor that is created by the `Deserializer` and -/// passed to the `Deserialize` to deserialize the content of a particular enum -/// variant. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed by the deserialized enum variant. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example implementation -/// -/// The [example data format] presented on the website demonstrates an -/// implementation of `VariantAccess` for a basic JSON data format. -/// -/// [example data format]: https://serde.rs/data-format.html -pub trait VariantAccess<'de>: Sized { - /// The error type that can be returned if some error occurs during - /// deserialization. Must match the error type of our `EnumAccess`. - type Error: Error; - - /// Called when deserializing a variant with no values. - /// - /// If the data contains a different type of variant, the following - /// `invalid_type` error should be constructed: - /// - /// ```edition2021 - /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; - /// # - /// # struct X; - /// # - /// # impl<'de> VariantAccess<'de> for X { - /// # type Error = value::Error; - /// # - /// fn unit_variant(self) -> Result<(), Self::Error> { - /// // What the data actually contained; suppose it is a tuple variant. - /// let unexp = Unexpected::TupleVariant; - /// Err(de::Error::invalid_type(unexp, &"unit variant")) - /// } - /// # - /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> - /// # where - /// # T: DeserializeSeed<'de>, - /// # { unimplemented!() } - /// # - /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # - /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # } - /// ``` - fn unit_variant(self) -> Result<(), Self::Error>; - - /// Called when deserializing a variant with a single value. - /// - /// `Deserialize` implementations should typically use - /// `VariantAccess::newtype_variant` instead. - /// - /// If the data contains a different type of variant, the following - /// `invalid_type` error should be constructed: - /// - /// ```edition2021 - /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; - /// # - /// # struct X; - /// # - /// # impl<'de> VariantAccess<'de> for X { - /// # type Error = value::Error; - /// # - /// # fn unit_variant(self) -> Result<(), Self::Error> { - /// # unimplemented!() - /// # } - /// # - /// fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error> - /// where - /// T: DeserializeSeed<'de>, - /// { - /// // What the data actually contained; suppose it is a unit variant. - /// let unexp = Unexpected::UnitVariant; - /// Err(de::Error::invalid_type(unexp, &"newtype variant")) - /// } - /// # - /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # - /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # } - /// ``` - fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, Self::Error> - where - T: DeserializeSeed<'de>; - - /// Called when deserializing a variant with a single value. - /// - /// This method exists as a convenience for `Deserialize` implementations. - /// `VariantAccess` implementations should not override the default - /// behavior. - #[inline] - fn newtype_variant<T>(self) -> Result<T, Self::Error> - where - T: Deserialize<'de>, - { - self.newtype_variant_seed(PhantomData) - } - - /// Called when deserializing a tuple-like variant. - /// - /// The `len` is the number of fields expected in the tuple variant. - /// - /// If the data contains a different type of variant, the following - /// `invalid_type` error should be constructed: - /// - /// ```edition2021 - /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; - /// # - /// # struct X; - /// # - /// # impl<'de> VariantAccess<'de> for X { - /// # type Error = value::Error; - /// # - /// # fn unit_variant(self) -> Result<(), Self::Error> { - /// # unimplemented!() - /// # } - /// # - /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> - /// # where - /// # T: DeserializeSeed<'de>, - /// # { unimplemented!() } - /// # - /// fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error> - /// where - /// V: Visitor<'de>, - /// { - /// // What the data actually contained; suppose it is a unit variant. - /// let unexp = Unexpected::UnitVariant; - /// Err(de::Error::invalid_type(unexp, &"tuple variant")) - /// } - /// # - /// # fn struct_variant<V>(self, _: &[&str], _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # } - /// ``` - fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; - - /// Called when deserializing a struct-like variant. - /// - /// The `fields` are the names of the fields of the struct variant. - /// - /// If the data contains a different type of variant, the following - /// `invalid_type` error should be constructed: - /// - /// ```edition2021 - /// # use serde::de::{self, value, DeserializeSeed, Visitor, VariantAccess, Unexpected}; - /// # - /// # struct X; - /// # - /// # impl<'de> VariantAccess<'de> for X { - /// # type Error = value::Error; - /// # - /// # fn unit_variant(self) -> Result<(), Self::Error> { - /// # unimplemented!() - /// # } - /// # - /// # fn newtype_variant_seed<T>(self, _: T) -> Result<T::Value, Self::Error> - /// # where - /// # T: DeserializeSeed<'de>, - /// # { unimplemented!() } - /// # - /// # fn tuple_variant<V>(self, _: usize, _: V) -> Result<V::Value, Self::Error> - /// # where - /// # V: Visitor<'de>, - /// # { unimplemented!() } - /// # - /// fn struct_variant<V>( - /// self, - /// _fields: &'static [&'static str], - /// _visitor: V, - /// ) -> Result<V::Value, Self::Error> - /// where - /// V: Visitor<'de>, - /// { - /// // What the data actually contained; suppose it is a unit variant. - /// let unexp = Unexpected::UnitVariant; - /// Err(de::Error::invalid_type(unexp, &"struct variant")) - /// } - /// # } - /// ``` - fn struct_variant<V>( - self, - fields: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>; -} - -//////////////////////////////////////////////////////////////////////////////// - -/// Converts an existing value into a `Deserializer` from which other values can -/// be deserialized. -/// -/// # Lifetime -/// -/// The `'de` lifetime of this trait is the lifetime of data that may be -/// borrowed from the resulting `Deserializer`. See the page [Understanding -/// deserializer lifetimes] for a more detailed explanation of these lifetimes. -/// -/// [Understanding deserializer lifetimes]: https://serde.rs/lifetimes.html -/// -/// # Example -/// -/// ```edition2021 -/// use serde::de::{value, Deserialize, IntoDeserializer}; -/// use serde_derive::Deserialize; -/// use std::str::FromStr; -/// -/// #[derive(Deserialize)] -/// enum Setting { -/// On, -/// Off, -/// } -/// -/// impl FromStr for Setting { -/// type Err = value::Error; -/// -/// fn from_str(s: &str) -> Result<Self, Self::Err> { -/// Self::deserialize(s.into_deserializer()) -/// } -/// } -/// ``` -pub trait IntoDeserializer<'de, E: Error = value::Error> { - /// The type of the deserializer being converted into. - type Deserializer: Deserializer<'de, Error = E>; - - /// Convert this value into a deserializer. - fn into_deserializer(self) -> Self::Deserializer; -} - -//////////////////////////////////////////////////////////////////////////////// - -/// Used in error messages. -/// -/// - expected `a` -/// - expected `a` or `b` -/// - expected one of `a`, `b`, `c` -/// -/// The slice of names must not be empty. -struct OneOf { - names: &'static [&'static str], -} - -impl Display for OneOf { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - match self.names.len() { - 0 => panic!(), // special case elsewhere - 1 => write!(formatter, "`{}`", self.names[0]), - 2 => write!(formatter, "`{}` or `{}`", self.names[0], self.names[1]), - _ => { - tri!(write!(formatter, "one of ")); - for (i, alt) in self.names.iter().enumerate() { - if i > 0 { - tri!(write!(formatter, ", ")); - } - tri!(write!(formatter, "`{}`", alt)); - } - Ok(()) - } - } - } -} diff --git a/vendor/serde/src/de/seed.rs b/vendor/serde/src/de/seed.rs deleted file mode 100644 index 52fb89d..0000000 --- a/vendor/serde/src/de/seed.rs +++ /dev/null @@ -1,19 +0,0 @@ -use crate::de::{Deserialize, DeserializeSeed, Deserializer}; - -/// A DeserializeSeed helper for implementing deserialize_in_place Visitors. -/// -/// Wraps a mutable reference and calls deserialize_in_place on it. -pub struct InPlaceSeed<'a, T: 'a>(pub &'a mut T); - -impl<'a, 'de, T> DeserializeSeed<'de> for InPlaceSeed<'a, T> -where - T: Deserialize<'de>, -{ - type Value = (); - fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - T::deserialize_in_place(deserializer, self.0) - } -} diff --git a/vendor/serde/src/de/size_hint.rs b/vendor/serde/src/de/size_hint.rs deleted file mode 100644 index 4a4fe25..0000000 --- a/vendor/serde/src/de/size_hint.rs +++ /dev/null @@ -1,29 +0,0 @@ -use crate::lib::*; - -pub fn from_bounds<I>(iter: &I) -> Option<usize> -where - I: Iterator, -{ - helper(iter.size_hint()) -} - -#[cfg(any(feature = "std", feature = "alloc"))] -pub fn cautious<Element>(hint: Option<usize>) -> usize { - const MAX_PREALLOC_BYTES: usize = 1024 * 1024; - - if mem::size_of::<Element>() == 0 { - 0 - } else { - cmp::min( - hint.unwrap_or(0), - MAX_PREALLOC_BYTES / mem::size_of::<Element>(), - ) - } -} - -fn helper(bounds: (usize, Option<usize>)) -> Option<usize> { - match bounds { - (lower, Some(upper)) if lower == upper => Some(upper), - _ => None, - } -} diff --git a/vendor/serde/src/de/value.rs b/vendor/serde/src/de/value.rs deleted file mode 100644 index b229eba..0000000 --- a/vendor/serde/src/de/value.rs +++ /dev/null @@ -1,1720 +0,0 @@ -//! Building blocks for deserializing basic values using the `IntoDeserializer` -//! trait. -//! -//! ```edition2021 -//! use serde::de::{value, Deserialize, IntoDeserializer}; -//! use serde_derive::Deserialize; -//! use std::str::FromStr; -//! -//! #[derive(Deserialize)] -//! enum Setting { -//! On, -//! Off, -//! } -//! -//! impl FromStr for Setting { -//! type Err = value::Error; -//! -//! fn from_str(s: &str) -> Result<Self, Self::Err> { -//! Self::deserialize(s.into_deserializer()) -//! } -//! } -//! ``` - -use crate::lib::*; - -use self::private::{First, Second}; -use crate::de::{self, size_hint, Deserializer, Expected, IntoDeserializer, SeqAccess, Visitor}; -use crate::ser; - -//////////////////////////////////////////////////////////////////////////////// - -// For structs that contain a PhantomData. We do not want the trait -// bound `E: Clone` inferred by derive(Clone). -macro_rules! impl_copy_clone { - ($ty:ident $(<$lifetime:tt>)*) => { - impl<$($lifetime,)* E> Copy for $ty<$($lifetime,)* E> {} - - impl<$($lifetime,)* E> Clone for $ty<$($lifetime,)* E> { - fn clone(&self) -> Self { - *self - } - } - }; -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A minimal representation of all possible errors that can occur using the -/// `IntoDeserializer` trait. -#[derive(Clone, PartialEq)] -pub struct Error { - err: ErrorImpl, -} - -#[cfg(any(feature = "std", feature = "alloc"))] -type ErrorImpl = Box<str>; -#[cfg(not(any(feature = "std", feature = "alloc")))] -type ErrorImpl = (); - -impl de::Error for Error { - #[cfg(any(feature = "std", feature = "alloc"))] - #[cold] - fn custom<T>(msg: T) -> Self - where - T: Display, - { - Error { - err: msg.to_string().into_boxed_str(), - } - } - - #[cfg(not(any(feature = "std", feature = "alloc")))] - #[cold] - fn custom<T>(msg: T) -> Self - where - T: Display, - { - let _ = msg; - Error { err: () } - } -} - -impl ser::Error for Error { - #[cold] - fn custom<T>(msg: T) -> Self - where - T: Display, - { - de::Error::custom(msg) - } -} - -impl Display for Error { - #[cfg(any(feature = "std", feature = "alloc"))] - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str(&self.err) - } - - #[cfg(not(any(feature = "std", feature = "alloc")))] - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.write_str("Serde deserialization error") - } -} - -impl Debug for Error { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - let mut debug = formatter.debug_tuple("Error"); - #[cfg(any(feature = "std", feature = "alloc"))] - debug.field(&self.err); - debug.finish() - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl error::Error for Error { - fn description(&self) -> &str { - &self.err - } -} - -//////////////////////////////////////////////////////////////////////////////// - -impl<'de, E> IntoDeserializer<'de, E> for () -where - E: de::Error, -{ - type Deserializer = UnitDeserializer<E>; - - fn into_deserializer(self) -> UnitDeserializer<E> { - UnitDeserializer::new() - } -} - -/// A deserializer holding a `()`. -pub struct UnitDeserializer<E> { - marker: PhantomData<E>, -} - -impl_copy_clone!(UnitDeserializer); - -impl<E> UnitDeserializer<E> { - #[allow(missing_docs)] - pub fn new() -> Self { - UnitDeserializer { - marker: PhantomData, - } - } -} - -impl<'de, E> de::Deserializer<'de> for UnitDeserializer<E> -where - E: de::Error, -{ - type Error = E; - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf unit unit_struct newtype_struct seq tuple tuple_struct - map struct enum identifier ignored_any - } - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_unit() - } - - fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_none() - } -} - -impl<E> Debug for UnitDeserializer<E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter.debug_struct("UnitDeserializer").finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer that cannot be instantiated. -#[cfg(feature = "unstable")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "unstable")))] -pub struct NeverDeserializer<E> { - never: !, - marker: PhantomData<E>, -} - -#[cfg(feature = "unstable")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "unstable")))] -impl<'de, E> IntoDeserializer<'de, E> for ! -where - E: de::Error, -{ - type Deserializer = NeverDeserializer<E>; - - fn into_deserializer(self) -> Self::Deserializer { - self - } -} - -#[cfg(feature = "unstable")] -impl<'de, E> de::Deserializer<'de> for NeverDeserializer<E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - self.never - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -//////////////////////////////////////////////////////////////////////////////// - -macro_rules! primitive_deserializer { - ($ty:ty, $doc:tt, $name:ident, $method:ident $($cast:tt)*) => { - #[doc = "A deserializer holding"] - #[doc = $doc] - pub struct $name<E> { - value: $ty, - marker: PhantomData<E> - } - - impl_copy_clone!($name); - - impl<'de, E> IntoDeserializer<'de, E> for $ty - where - E: de::Error, - { - type Deserializer = $name<E>; - - fn into_deserializer(self) -> $name<E> { - $name::new(self) - } - } - - impl<E> $name<E> { - #[allow(missing_docs)] - pub fn new(value: $ty) -> Self { - $name { - value, - marker: PhantomData, - } - } - } - - impl<'de, E> de::Deserializer<'de> for $name<E> - where - E: de::Error, - { - type Error = E; - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str - string bytes byte_buf option unit unit_struct newtype_struct seq - tuple tuple_struct map struct enum identifier ignored_any - } - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.$method(self.value $($cast)*) - } - } - - impl<E> Debug for $name<E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct(stringify!($name)) - .field("value", &self.value) - .finish() - } - } - } -} - -primitive_deserializer!(bool, "a `bool`.", BoolDeserializer, visit_bool); -primitive_deserializer!(i8, "an `i8`.", I8Deserializer, visit_i8); -primitive_deserializer!(i16, "an `i16`.", I16Deserializer, visit_i16); -primitive_deserializer!(i32, "an `i32`.", I32Deserializer, visit_i32); -primitive_deserializer!(i64, "an `i64`.", I64Deserializer, visit_i64); -primitive_deserializer!(i128, "an `i128`.", I128Deserializer, visit_i128); -primitive_deserializer!(isize, "an `isize`.", IsizeDeserializer, visit_i64 as i64); -primitive_deserializer!(u8, "a `u8`.", U8Deserializer, visit_u8); -primitive_deserializer!(u16, "a `u16`.", U16Deserializer, visit_u16); -primitive_deserializer!(u64, "a `u64`.", U64Deserializer, visit_u64); -primitive_deserializer!(u128, "a `u128`.", U128Deserializer, visit_u128); -primitive_deserializer!(usize, "a `usize`.", UsizeDeserializer, visit_u64 as u64); -primitive_deserializer!(f32, "an `f32`.", F32Deserializer, visit_f32); -primitive_deserializer!(f64, "an `f64`.", F64Deserializer, visit_f64); -primitive_deserializer!(char, "a `char`.", CharDeserializer, visit_char); - -/// A deserializer holding a `u32`. -pub struct U32Deserializer<E> { - value: u32, - marker: PhantomData<E>, -} - -impl_copy_clone!(U32Deserializer); - -impl<'de, E> IntoDeserializer<'de, E> for u32 -where - E: de::Error, -{ - type Deserializer = U32Deserializer<E>; - - fn into_deserializer(self) -> U32Deserializer<E> { - U32Deserializer::new(self) - } -} - -impl<E> U32Deserializer<E> { - #[allow(missing_docs)] - pub fn new(value: u32) -> Self { - U32Deserializer { - value, - marker: PhantomData, - } - } -} - -impl<'de, E> de::Deserializer<'de> for U32Deserializer<E> -where - E: de::Error, -{ - type Error = E; - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_u32(self.value) - } - - fn deserialize_enum<V>( - self, - name: &str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = name; - let _ = variants; - visitor.visit_enum(self) - } -} - -impl<'de, E> de::EnumAccess<'de> for U32Deserializer<E> -where - E: de::Error, -{ - type Error = E; - type Variant = private::UnitOnly<E>; - - fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - seed.deserialize(self).map(private::unit_only) - } -} - -impl<E> Debug for U32Deserializer<E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("U32Deserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `&str`. -pub struct StrDeserializer<'a, E> { - value: &'a str, - marker: PhantomData<E>, -} - -impl_copy_clone!(StrDeserializer<'de>); - -impl<'de, 'a, E> IntoDeserializer<'de, E> for &'a str -where - E: de::Error, -{ - type Deserializer = StrDeserializer<'a, E>; - - fn into_deserializer(self) -> StrDeserializer<'a, E> { - StrDeserializer::new(self) - } -} - -impl<'a, E> StrDeserializer<'a, E> { - #[allow(missing_docs)] - pub fn new(value: &'a str) -> Self { - StrDeserializer { - value, - marker: PhantomData, - } - } -} - -impl<'de, 'a, E> de::Deserializer<'de> for StrDeserializer<'a, E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_str(self.value) - } - - fn deserialize_enum<V>( - self, - name: &str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = name; - let _ = variants; - visitor.visit_enum(self) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } -} - -impl<'de, 'a, E> de::EnumAccess<'de> for StrDeserializer<'a, E> -where - E: de::Error, -{ - type Error = E; - type Variant = private::UnitOnly<E>; - - fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - seed.deserialize(self).map(private::unit_only) - } -} - -impl<'a, E> Debug for StrDeserializer<'a, E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("StrDeserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `&str` with a lifetime tied to another -/// deserializer. -pub struct BorrowedStrDeserializer<'de, E> { - value: &'de str, - marker: PhantomData<E>, -} - -impl_copy_clone!(BorrowedStrDeserializer<'de>); - -impl<'de, E> BorrowedStrDeserializer<'de, E> { - /// Create a new borrowed deserializer from the given string. - pub fn new(value: &'de str) -> BorrowedStrDeserializer<'de, E> { - BorrowedStrDeserializer { - value, - marker: PhantomData, - } - } -} - -impl<'de, E> de::Deserializer<'de> for BorrowedStrDeserializer<'de, E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_borrowed_str(self.value) - } - - fn deserialize_enum<V>( - self, - name: &str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = name; - let _ = variants; - visitor.visit_enum(self) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } -} - -impl<'de, E> de::EnumAccess<'de> for BorrowedStrDeserializer<'de, E> -where - E: de::Error, -{ - type Error = E; - type Variant = private::UnitOnly<E>; - - fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - seed.deserialize(self).map(private::unit_only) - } -} - -impl<'de, E> Debug for BorrowedStrDeserializer<'de, E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("BorrowedStrDeserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `String`. -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -pub struct StringDeserializer<E> { - value: String, - marker: PhantomData<E>, -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<E> Clone for StringDeserializer<E> { - fn clone(&self) -> Self { - StringDeserializer { - value: self.value.clone(), - marker: PhantomData, - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, E> IntoDeserializer<'de, E> for String -where - E: de::Error, -{ - type Deserializer = StringDeserializer<E>; - - fn into_deserializer(self) -> StringDeserializer<E> { - StringDeserializer::new(self) - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<E> StringDeserializer<E> { - #[allow(missing_docs)] - pub fn new(value: String) -> Self { - StringDeserializer { - value, - marker: PhantomData, - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'de, E> de::Deserializer<'de> for StringDeserializer<E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_string(self.value) - } - - fn deserialize_enum<V>( - self, - name: &str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = name; - let _ = variants; - visitor.visit_enum(self) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'de, E> de::EnumAccess<'de> for StringDeserializer<E> -where - E: de::Error, -{ - type Error = E; - type Variant = private::UnitOnly<E>; - - fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - seed.deserialize(self).map(private::unit_only) - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<E> Debug for StringDeserializer<E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("StringDeserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `Cow<str>`. -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -pub struct CowStrDeserializer<'a, E> { - value: Cow<'a, str>, - marker: PhantomData<E>, -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'a, E> Clone for CowStrDeserializer<'a, E> { - fn clone(&self) -> Self { - CowStrDeserializer { - value: self.value.clone(), - marker: PhantomData, - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str> -where - E: de::Error, -{ - type Deserializer = CowStrDeserializer<'a, E>; - - fn into_deserializer(self) -> CowStrDeserializer<'a, E> { - CowStrDeserializer::new(self) - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'a, E> CowStrDeserializer<'a, E> { - #[allow(missing_docs)] - pub fn new(value: Cow<'a, str>) -> Self { - CowStrDeserializer { - value, - marker: PhantomData, - } - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'de, 'a, E> de::Deserializer<'de> for CowStrDeserializer<'a, E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - match self.value { - Cow::Borrowed(string) => visitor.visit_str(string), - Cow::Owned(string) => visitor.visit_string(string), - } - } - - fn deserialize_enum<V>( - self, - name: &str, - variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = name; - let _ = variants; - visitor.visit_enum(self) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'de, 'a, E> de::EnumAccess<'de> for CowStrDeserializer<'a, E> -where - E: de::Error, -{ - type Error = E; - type Variant = private::UnitOnly<E>; - - fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - seed.deserialize(self).map(private::unit_only) - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -impl<'a, E> Debug for CowStrDeserializer<'a, E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("CowStrDeserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `&[u8]`. Always calls [`Visitor::visit_bytes`]. -pub struct BytesDeserializer<'a, E> { - value: &'a [u8], - marker: PhantomData<E>, -} - -impl<'a, E> BytesDeserializer<'a, E> { - /// Create a new deserializer from the given bytes. - pub fn new(value: &'a [u8]) -> Self { - BytesDeserializer { - value, - marker: PhantomData, - } - } -} - -impl_copy_clone!(BytesDeserializer<'a>); - -impl<'de, 'a, E> IntoDeserializer<'de, E> for &'a [u8] -where - E: de::Error, -{ - type Deserializer = BytesDeserializer<'a, E>; - - fn into_deserializer(self) -> BytesDeserializer<'a, E> { - BytesDeserializer::new(self) - } -} - -impl<'de, 'a, E> Deserializer<'de> for BytesDeserializer<'a, E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - visitor.visit_bytes(self.value) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -impl<'a, E> Debug for BytesDeserializer<'a, E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("BytesDeserializer") - .field("value", &self.value) - .finish() - } -} - -/// A deserializer holding a `&[u8]` with a lifetime tied to another -/// deserializer. Always calls [`Visitor::visit_borrowed_bytes`]. -pub struct BorrowedBytesDeserializer<'de, E> { - value: &'de [u8], - marker: PhantomData<E>, -} - -impl<'de, E> BorrowedBytesDeserializer<'de, E> { - /// Create a new borrowed deserializer from the given borrowed bytes. - pub fn new(value: &'de [u8]) -> Self { - BorrowedBytesDeserializer { - value, - marker: PhantomData, - } - } -} - -impl_copy_clone!(BorrowedBytesDeserializer<'de>); - -impl<'de, E> Deserializer<'de> for BorrowedBytesDeserializer<'de, E> -where - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - visitor.visit_borrowed_bytes(self.value) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -impl<'de, E> Debug for BorrowedBytesDeserializer<'de, E> { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("BorrowedBytesDeserializer") - .field("value", &self.value) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer that iterates over a sequence. -#[derive(Clone)] -pub struct SeqDeserializer<I, E> { - iter: iter::Fuse<I>, - count: usize, - marker: PhantomData<E>, -} - -impl<I, E> SeqDeserializer<I, E> -where - I: Iterator, -{ - /// Construct a new `SeqDeserializer<I, E>`. - pub fn new(iter: I) -> Self { - SeqDeserializer { - iter: iter.fuse(), - count: 0, - marker: PhantomData, - } - } -} - -impl<I, E> SeqDeserializer<I, E> -where - I: Iterator, - E: de::Error, -{ - /// Check for remaining elements after passing a `SeqDeserializer` to - /// `Visitor::visit_seq`. - pub fn end(self) -> Result<(), E> { - let remaining = self.iter.count(); - if remaining == 0 { - Ok(()) - } else { - // First argument is the number of elements in the data, second - // argument is the number of elements expected by the Deserialize. - Err(de::Error::invalid_length( - self.count + remaining, - &ExpectedInSeq(self.count), - )) - } - } -} - -impl<'de, I, T, E> de::Deserializer<'de> for SeqDeserializer<I, E> -where - I: Iterator<Item = T>, - T: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let v = tri!(visitor.visit_seq(&mut self)); - tri!(self.end()); - Ok(v) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -impl<'de, I, T, E> de::SeqAccess<'de> for SeqDeserializer<I, E> -where - I: Iterator<Item = T>, - T: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn next_element_seed<V>(&mut self, seed: V) -> Result<Option<V::Value>, Self::Error> - where - V: de::DeserializeSeed<'de>, - { - match self.iter.next() { - Some(value) => { - self.count += 1; - seed.deserialize(value.into_deserializer()).map(Some) - } - None => Ok(None), - } - } - - fn size_hint(&self) -> Option<usize> { - size_hint::from_bounds(&self.iter) - } -} - -struct ExpectedInSeq(usize); - -impl Expected for ExpectedInSeq { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - if self.0 == 1 { - write!(formatter, "1 element in sequence") - } else { - write!(formatter, "{} elements in sequence", self.0) - } - } -} - -impl<I, E> Debug for SeqDeserializer<I, E> -where - I: Debug, -{ - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("SeqDeserializer") - .field("iter", &self.iter) - .field("count", &self.count) - .finish() - } -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, T, E> IntoDeserializer<'de, E> for Vec<T> -where - T: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; - - fn into_deserializer(self) -> Self::Deserializer { - SeqDeserializer::new(self.into_iter()) - } -} - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, T, E> IntoDeserializer<'de, E> for BTreeSet<T> -where - T: IntoDeserializer<'de, E> + Eq + Ord, - E: de::Error, -{ - type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; - - fn into_deserializer(self) -> Self::Deserializer { - SeqDeserializer::new(self.into_iter()) - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de, T, S, E> IntoDeserializer<'de, E> for HashSet<T, S> -where - T: IntoDeserializer<'de, E> + Eq + Hash, - S: BuildHasher, - E: de::Error, -{ - type Deserializer = SeqDeserializer<<Self as IntoIterator>::IntoIter, E>; - - fn into_deserializer(self) -> Self::Deserializer { - SeqDeserializer::new(self.into_iter()) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `SeqAccess`. -#[derive(Clone, Debug)] -pub struct SeqAccessDeserializer<A> { - seq: A, -} - -impl<A> SeqAccessDeserializer<A> { - /// Construct a new `SeqAccessDeserializer<A>`. - pub fn new(seq: A) -> Self { - SeqAccessDeserializer { seq } - } -} - -impl<'de, A> de::Deserializer<'de> for SeqAccessDeserializer<A> -where - A: de::SeqAccess<'de>, -{ - type Error = A::Error; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_seq(self.seq) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer that iterates over a map. -pub struct MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, -{ - iter: iter::Fuse<I>, - value: Option<Second<I::Item>>, - count: usize, - lifetime: PhantomData<&'de ()>, - error: PhantomData<E>, -} - -impl<'de, I, E> MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, -{ - /// Construct a new `MapDeserializer<I, E>`. - pub fn new(iter: I) -> Self { - MapDeserializer { - iter: iter.fuse(), - value: None, - count: 0, - lifetime: PhantomData, - error: PhantomData, - } - } -} - -impl<'de, I, E> MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, - E: de::Error, -{ - /// Check for remaining elements after passing a `MapDeserializer` to - /// `Visitor::visit_map`. - pub fn end(self) -> Result<(), E> { - let remaining = self.iter.count(); - if remaining == 0 { - Ok(()) - } else { - // First argument is the number of elements in the data, second - // argument is the number of elements expected by the Deserialize. - Err(de::Error::invalid_length( - self.count + remaining, - &ExpectedInMap(self.count), - )) - } - } -} - -impl<'de, I, E> MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, -{ - fn next_pair(&mut self) -> Option<(First<I::Item>, Second<I::Item>)> { - match self.iter.next() { - Some(kv) => { - self.count += 1; - Some(private::Pair::split(kv)) - } - None => None, - } - } -} - -impl<'de, I, E> de::Deserializer<'de> for MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, - First<I::Item>: IntoDeserializer<'de, E>, - Second<I::Item>: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let value = tri!(visitor.visit_map(&mut self)); - tri!(self.end()); - Ok(value) - } - - fn deserialize_seq<V>(mut self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let value = tri!(visitor.visit_seq(&mut self)); - tri!(self.end()); - Ok(value) - } - - fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let _ = len; - self.deserialize_seq(visitor) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct tuple_struct map - struct enum identifier ignored_any - } -} - -impl<'de, I, E> de::MapAccess<'de> for MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, - First<I::Item>: IntoDeserializer<'de, E>, - Second<I::Item>: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> - where - T: de::DeserializeSeed<'de>, - { - match self.next_pair() { - Some((key, value)) => { - self.value = Some(value); - seed.deserialize(key.into_deserializer()).map(Some) - } - None => Ok(None), - } - } - - fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error> - where - T: de::DeserializeSeed<'de>, - { - let value = self.value.take(); - // Panic because this indicates a bug in the program rather than an - // expected failure. - let value = value.expect("MapAccess::next_value called before next_key"); - seed.deserialize(value.into_deserializer()) - } - - fn next_entry_seed<TK, TV>( - &mut self, - kseed: TK, - vseed: TV, - ) -> Result<Option<(TK::Value, TV::Value)>, Self::Error> - where - TK: de::DeserializeSeed<'de>, - TV: de::DeserializeSeed<'de>, - { - match self.next_pair() { - Some((key, value)) => { - let key = tri!(kseed.deserialize(key.into_deserializer())); - let value = tri!(vseed.deserialize(value.into_deserializer())); - Ok(Some((key, value))) - } - None => Ok(None), - } - } - - fn size_hint(&self) -> Option<usize> { - size_hint::from_bounds(&self.iter) - } -} - -impl<'de, I, E> de::SeqAccess<'de> for MapDeserializer<'de, I, E> -where - I: Iterator, - I::Item: private::Pair, - First<I::Item>: IntoDeserializer<'de, E>, - Second<I::Item>: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> - where - T: de::DeserializeSeed<'de>, - { - match self.next_pair() { - Some((k, v)) => { - let de = PairDeserializer(k, v, PhantomData); - seed.deserialize(de).map(Some) - } - None => Ok(None), - } - } - - fn size_hint(&self) -> Option<usize> { - size_hint::from_bounds(&self.iter) - } -} - -// Cannot #[derive(Clone)] because of the bound `Second<I::Item>: Clone`. -impl<'de, I, E> Clone for MapDeserializer<'de, I, E> -where - I: Iterator + Clone, - I::Item: private::Pair, - Second<I::Item>: Clone, -{ - fn clone(&self) -> Self { - MapDeserializer { - iter: self.iter.clone(), - value: self.value.clone(), - count: self.count, - lifetime: self.lifetime, - error: self.error, - } - } -} - -impl<'de, I, E> Debug for MapDeserializer<'de, I, E> -where - I: Iterator + Debug, - I::Item: private::Pair, - Second<I::Item>: Debug, -{ - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - formatter - .debug_struct("MapDeserializer") - .field("iter", &self.iter) - .field("value", &self.value) - .field("count", &self.count) - .finish() - } -} - -// Used in the `impl SeqAccess for MapDeserializer` to visit the map as a -// sequence of pairs. -struct PairDeserializer<A, B, E>(A, B, PhantomData<E>); - -impl<'de, A, B, E> de::Deserializer<'de> for PairDeserializer<A, B, E> -where - A: IntoDeserializer<'de, E>, - B: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct tuple_struct map - struct enum identifier ignored_any - } - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - self.deserialize_seq(visitor) - } - - fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - let mut pair_visitor = PairVisitor(Some(self.0), Some(self.1), PhantomData); - let pair = tri!(visitor.visit_seq(&mut pair_visitor)); - if pair_visitor.1.is_none() { - Ok(pair) - } else { - let remaining = pair_visitor.size_hint().unwrap(); - // First argument is the number of elements in the data, second - // argument is the number of elements expected by the Deserialize. - Err(de::Error::invalid_length(2, &ExpectedInSeq(2 - remaining))) - } - } - - fn deserialize_tuple<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - if len == 2 { - self.deserialize_seq(visitor) - } else { - // First argument is the number of elements in the data, second - // argument is the number of elements expected by the Deserialize. - Err(de::Error::invalid_length(2, &ExpectedInSeq(len))) - } - } -} - -struct PairVisitor<A, B, E>(Option<A>, Option<B>, PhantomData<E>); - -impl<'de, A, B, E> de::SeqAccess<'de> for PairVisitor<A, B, E> -where - A: IntoDeserializer<'de, E>, - B: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Error = E; - - fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error> - where - T: de::DeserializeSeed<'de>, - { - if let Some(k) = self.0.take() { - seed.deserialize(k.into_deserializer()).map(Some) - } else if let Some(v) = self.1.take() { - seed.deserialize(v.into_deserializer()).map(Some) - } else { - Ok(None) - } - } - - fn size_hint(&self) -> Option<usize> { - if self.0.is_some() { - Some(2) - } else if self.1.is_some() { - Some(1) - } else { - Some(0) - } - } -} - -struct ExpectedInMap(usize); - -impl Expected for ExpectedInMap { - fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { - if self.0 == 1 { - write!(formatter, "1 element in map") - } else { - write!(formatter, "{} elements in map", self.0) - } - } -} - -//////////////////////////////////////////////////////////////////////////////// - -#[cfg(any(feature = "std", feature = "alloc"))] -#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "alloc"))))] -impl<'de, K, V, E> IntoDeserializer<'de, E> for BTreeMap<K, V> -where - K: IntoDeserializer<'de, E> + Eq + Ord, - V: IntoDeserializer<'de, E>, - E: de::Error, -{ - type Deserializer = MapDeserializer<'de, <Self as IntoIterator>::IntoIter, E>; - - fn into_deserializer(self) -> Self::Deserializer { - MapDeserializer::new(self.into_iter()) - } -} - -#[cfg(feature = "std")] -#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))] -impl<'de, K, V, S, E> IntoDeserializer<'de, E> for HashMap<K, V, S> -where - K: IntoDeserializer<'de, E> + Eq + Hash, - V: IntoDeserializer<'de, E>, - S: BuildHasher, - E: de::Error, -{ - type Deserializer = MapDeserializer<'de, <Self as IntoIterator>::IntoIter, E>; - - fn into_deserializer(self) -> Self::Deserializer { - MapDeserializer::new(self.into_iter()) - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding a `MapAccess`. -#[derive(Clone, Debug)] -pub struct MapAccessDeserializer<A> { - map: A, -} - -impl<A> MapAccessDeserializer<A> { - /// Construct a new `MapAccessDeserializer<A>`. - pub fn new(map: A) -> Self { - MapAccessDeserializer { map } - } -} - -impl<'de, A> de::Deserializer<'de> for MapAccessDeserializer<A> -where - A: de::MapAccess<'de>, -{ - type Error = A::Error; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_map(self.map) - } - - fn deserialize_enum<V>( - self, - _name: &str, - _variants: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_enum(self) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct identifier ignored_any - } -} - -impl<'de, A> de::EnumAccess<'de> for MapAccessDeserializer<A> -where - A: de::MapAccess<'de>, -{ - type Error = A::Error; - type Variant = private::MapAsEnum<A>; - - fn variant_seed<T>(mut self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error> - where - T: de::DeserializeSeed<'de>, - { - match tri!(self.map.next_key_seed(seed)) { - Some(key) => Ok((key, private::map_as_enum(self.map))), - None => Err(de::Error::invalid_type(de::Unexpected::Map, &"enum")), - } - } -} - -//////////////////////////////////////////////////////////////////////////////// - -/// A deserializer holding an `EnumAccess`. -#[derive(Clone, Debug)] -pub struct EnumAccessDeserializer<A> { - access: A, -} - -impl<A> EnumAccessDeserializer<A> { - /// Construct a new `EnumAccessDeserializer<A>`. - pub fn new(access: A) -> Self { - EnumAccessDeserializer { access } - } -} - -impl<'de, A> de::Deserializer<'de> for EnumAccessDeserializer<A> -where - A: de::EnumAccess<'de>, -{ - type Error = A::Error; - - fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - visitor.visit_enum(self.access) - } - - forward_to_deserialize_any! { - bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string - bytes byte_buf option unit unit_struct newtype_struct seq tuple - tuple_struct map struct enum identifier ignored_any - } -} - -//////////////////////////////////////////////////////////////////////////////// - -mod private { - use crate::lib::*; - - use crate::de::{ - self, DeserializeSeed, Deserializer, MapAccess, Unexpected, VariantAccess, Visitor, - }; - - pub struct UnitOnly<E> { - marker: PhantomData<E>, - } - - pub fn unit_only<T, E>(t: T) -> (T, UnitOnly<E>) { - ( - t, - UnitOnly { - marker: PhantomData, - }, - ) - } - - impl<'de, E> de::VariantAccess<'de> for UnitOnly<E> - where - E: de::Error, - { - type Error = E; - - fn unit_variant(self) -> Result<(), Self::Error> { - Ok(()) - } - - fn newtype_variant_seed<T>(self, _seed: T) -> Result<T::Value, Self::Error> - where - T: de::DeserializeSeed<'de>, - { - Err(de::Error::invalid_type( - Unexpected::UnitVariant, - &"newtype variant", - )) - } - - fn tuple_variant<V>(self, _len: usize, _visitor: V) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - Err(de::Error::invalid_type( - Unexpected::UnitVariant, - &"tuple variant", - )) - } - - fn struct_variant<V>( - self, - _fields: &'static [&'static str], - _visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: de::Visitor<'de>, - { - Err(de::Error::invalid_type( - Unexpected::UnitVariant, - &"struct variant", - )) - } - } - - pub struct MapAsEnum<A> { - map: A, - } - - pub fn map_as_enum<A>(map: A) -> MapAsEnum<A> { - MapAsEnum { map } - } - - impl<'de, A> VariantAccess<'de> for MapAsEnum<A> - where - A: MapAccess<'de>, - { - type Error = A::Error; - - fn unit_variant(mut self) -> Result<(), Self::Error> { - self.map.next_value() - } - - fn newtype_variant_seed<T>(mut self, seed: T) -> Result<T::Value, Self::Error> - where - T: DeserializeSeed<'de>, - { - self.map.next_value_seed(seed) - } - - fn tuple_variant<V>(mut self, len: usize, visitor: V) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - self.map.next_value_seed(SeedTupleVariant { len, visitor }) - } - - fn struct_variant<V>( - mut self, - _fields: &'static [&'static str], - visitor: V, - ) -> Result<V::Value, Self::Error> - where - V: Visitor<'de>, - { - self.map.next_value_seed(SeedStructVariant { visitor }) - } - } - - struct SeedTupleVariant<V> { - len: usize, - visitor: V, - } - - impl<'de, V> DeserializeSeed<'de> for SeedTupleVariant<V> - where - V: Visitor<'de>, - { - type Value = V::Value; - - fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_tuple(self.len, self.visitor) - } - } - - struct SeedStructVariant<V> { - visitor: V, - } - - impl<'de, V> DeserializeSeed<'de> for SeedStructVariant<V> - where - V: Visitor<'de>, - { - type Value = V::Value; - - fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error> - where - D: Deserializer<'de>, - { - deserializer.deserialize_map(self.visitor) - } - } - - /// Avoid having to restate the generic types on `MapDeserializer`. The - /// `Iterator::Item` contains enough information to figure out K and V. - pub trait Pair { - type First; - type Second; - fn split(self) -> (Self::First, Self::Second); - } - - impl<A, B> Pair for (A, B) { - type First = A; - type Second = B; - fn split(self) -> (A, B) { - self - } - } - - pub type First<T> = <T as Pair>::First; - pub type Second<T> = <T as Pair>::Second; -} |