diff options
Diffstat (limited to 'third_party/rust/serde/src/de/impls.rs')
| -rw-r--r-- | third_party/rust/serde/src/de/impls.rs | 3071 |
1 files changed, 3071 insertions, 0 deletions
diff --git a/third_party/rust/serde/src/de/impls.rs b/third_party/rust/serde/src/de/impls.rs new file mode 100644 index 0000000000..413c997afd --- /dev/null +++ b/third_party/rust/serde/src/de/impls.rs @@ -0,0 +1,3071 @@ +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) + } +} |