add f16 and f128 support

serde/src/de/ignored_any.rs

@@ -153,6 +153,13 @@ impl<'de> Visitor<'de> for IgnoredAny {
         Ok(IgnoredAny)
     }
 
+    #[inline]
+    #[cfg(feature = "unstable")]
+    fn visit_f128<E>(self, x: f128) -> Result<Self::Value, E> {
+        let _ = x;
+        Ok(IgnoredAny)
+    }
+
     #[inline]
     fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
     where

serde/src/de/impls.rs

@@ -448,6 +448,15 @@ impl_deserialize_num! {
     uint_to_self!(u32:visit_u32 u64:visit_u64);
 }
 
+#[cfg(feature = "unstable")]
+impl_deserialize_num! {
+    f16, deserialize_f16
+    num_self!(f16:visit_f16);
+    num_as_copysign_self!(f32:visit_f32 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! {
     f32, deserialize_f32
     num_self!(f32:visit_f32);
@@ -517,6 +526,17 @@ macro_rules! num_128 {
     };
 }
 
+#[cfg(feature = "unstable")]
+impl_deserialize_num! {
+    f128, deserialize_f128
+    num_self!(f128:visit_f128);
+    num_as_copysign_self!(f32:visit_f32 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);
+    num_128!(u128:visit_u128);
+    num_128!(i128:visit_i128);
+}
+
 impl_deserialize_num! {
     i128, NonZeroI128, deserialize_i128
     num_self!(i128:visit_i128);

serde/src/de/mod.rs

@@ -996,6 +996,18 @@ pub trait Deserializer<'de>: Sized {
         Err(Error::custom("u128 is not supported"))
     }
 
+    /// Hint that the `Deserialize` type is expecting a `f16` value.
+    ///
+    /// The default behavior unconditionally returns an error.
+    #[cfg(feature = "unstable")]
+    fn deserialize_f16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        let _ = visitor;
+        Err(Error::custom("f16 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
@@ -1006,6 +1018,18 @@ pub trait Deserializer<'de>: Sized {
     where
         V: Visitor<'de>;
 
+    /// Hint that the `Deserialize` type is expecting a `f128` value.
+    ///
+    /// The default behavior unconditionally returns an error.
+    #[cfg(feature = "unstable")]
+    fn deserialize_f128<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: Visitor<'de>,
+    {
+        let _ = visitor;
+        Err(Error::custom("f128 is not supported"))
+    }
+
     /// Hint that the `Deserialize` type is expecting a `char` value.
     fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
     where
@@ -1439,6 +1463,19 @@ pub trait Visitor<'de>: Sized {
         ))
     }
 
+    /// The input contains a `f16`.
+    ///
+    /// The default implementation forwards to [`visit_f64`].
+    ///
+    /// [`visit_f64`]: #method.visit_f64
+    #[cfg(feature = "unstable")]
+    fn visit_f16<E>(self, v: f16) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        self.visit_f64(v as f64)
+    }
+
     /// The input contains an `f32`.
     ///
     /// The default implementation forwards to [`visit_f64`].
@@ -1461,6 +1498,28 @@ pub trait Visitor<'de>: Sized {
         Err(Error::invalid_type(Unexpected::Float(v), &self))
     }
 
+    /// The input contains a `f128`.
+    ///
+    /// The default implementation fails with a type error.
+    #[cfg(feature = "unstable")]
+    fn visit_f128<E>(self, v: f128) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        let mut buf = [0u8; 64];
+        let mut writer = crate::format::Buf::new(&mut buf);
+        fmt::Write::write_fmt(
+            &mut writer,
+            format_args!("float `{:x}` as f128", v.to_bits()),
+        )
+        .unwrap();
+
+        Err(Error::invalid_type(
+            Unexpected::Other(writer.as_str()),
+            &self,
+        ))
+    }
+
     /// The input contains a `char`.
     ///
     /// The default implementation forwards to [`visit_str`] as a one-character

serde/src/de/value.rs

@@ -160,6 +160,11 @@ where
         map struct enum identifier ignored_any
     }
 
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
+
     fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
     where
         V: de::Visitor<'de>,
@@ -230,7 +235,7 @@ where
     }
 
     forward_to_deserialize_any! {
-        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
+        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f16 f32 f64 f128 char str string
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct enum identifier ignored_any
     }
@@ -294,6 +299,11 @@ macro_rules! primitive_deserializer {
                 tuple tuple_struct map struct enum identifier ignored_any
             }
 
+            #[cfg(feature = "unstable")]
+            forward_to_deserialize_any! {
+                f16 f128
+            }
+
             fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
             where
                 V: de::Visitor<'de>,
@@ -336,8 +346,12 @@ 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);
+#[cfg(feature = "unstable")]
+primitive_deserializer!(f16, "an `f16`.", F16Deserializer, visit_f16);
 primitive_deserializer!(f32, "an `f32`.", F32Deserializer, visit_f32);
 primitive_deserializer!(f64, "an `f64`.", F64Deserializer, visit_f64);
+#[cfg(feature = "unstable")]
+primitive_deserializer!(f128, "an `f128`.", F128Deserializer, visit_f128);
 primitive_deserializer!(char, "a `char`.", CharDeserializer, visit_char);
 
 /// A deserializer holding a `u32`.
@@ -381,6 +395,11 @@ where
         tuple_struct map struct identifier ignored_any
     }
 
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
+
     fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
     where
         V: de::Visitor<'de>,
@@ -501,6 +520,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, 'a, E> IntoDeserializer<'de, E> for StrDeserializer<'a, E>
@@ -591,6 +615,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, E> IntoDeserializer<'de, E> for BorrowedStrDeserializer<'de, E>
@@ -705,6 +734,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 #[cfg(any(feature = "std", feature = "alloc"))]
@@ -825,6 +859,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 #[cfg(any(feature = "std", feature = "alloc"))]
@@ -914,6 +953,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct enum identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, 'a, E> IntoDeserializer<'de, E> for BytesDeserializer<'a, E>
@@ -973,6 +1017,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct enum identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, E> IntoDeserializer<'de, E> for BorrowedBytesDeserializer<'de, E>
@@ -1063,6 +1112,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct enum identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, I, T, E> IntoDeserializer<'de, E> for SeqDeserializer<I, E>
@@ -1207,6 +1261,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct enum identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, A> IntoDeserializer<'de, A::Error> for SeqAccessDeserializer<A>
@@ -1332,6 +1391,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct tuple_struct map
         struct enum identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, I, E> IntoDeserializer<'de, E> for MapDeserializer<'de, I, E>
@@ -1487,6 +1551,11 @@ where
         struct enum identifier ignored_any
     }
 
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
+
     fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
     where
         V: de::Visitor<'de>,
@@ -1648,6 +1717,11 @@ where
         bytes byte_buf option unit unit_struct newtype_struct seq tuple
         tuple_struct map struct identifier ignored_any
     }
+
+    #[cfg(feature = "unstable")]
+    forward_to_deserialize_any! {
+        f16 f128
+    }
 }
 
 impl<'de, A> IntoDeserializer<'de, A::Error> for MapAccessDeserializer<A>

serde/src/lib.rs

@@ -105,8 +105,13 @@
 // discussion of these features please refer to this issue:
 //
 //    https://github.com/serde-rs/serde/issues/812
-#![cfg_attr(feature = "unstable", feature(never_type))]
-#![allow(unknown_lints, bare_trait_objects, deprecated, mismatched_lifetime_syntaxes)]
+#![cfg_attr(feature = "unstable", feature(never_type, f16, f128))]
+#![allow(
+    unknown_lints,
+    bare_trait_objects,
+    deprecated,
+    mismatched_lifetime_syntaxes
+)]
 // Ignored clippy and clippy_pedantic lints
 #![allow(
     // clippy bug: https://github.com/rust-lang/rust-clippy/issues/5704
@@ -304,12 +309,12 @@ macro_rules! tri {
 #[macro_use]
 mod macros;
 
-#[macro_use]
-mod integer128;
-
 pub mod de;
 pub mod ser;
 
+#[macro_use]
+mod integer128;
+
 mod format;
 
 #[doc(inline)]

serde/src/macros.rs

@@ -109,6 +109,8 @@
 /// [`Deserializer::deserialize_any`]: crate::Deserializer::deserialize_any
 #[macro_export(local_inner_macros)]
 macro_rules! forward_to_deserialize_any {
+    // there should be just a special case called all that implements all of this,
+    // this is a pain to update
     (<$visitor:ident: Visitor<$lifetime:tt>> $($func:ident)*) => {
         $(forward_to_deserialize_any_helper!{$func<$lifetime, $visitor>})*
     };
@@ -171,12 +173,18 @@ macro_rules! forward_to_deserialize_any_helper {
     (u128<$l:tt, $v:ident>) => {
         forward_to_deserialize_any_method!{deserialize_u128<$l, $v>()}
     };
+    (f16<$l:tt, $v:ident>) => {
+        forward_to_deserialize_any_method!{deserialize_f16<$l, $v>()}
+    };
     (f32<$l:tt, $v:ident>) => {
         forward_to_deserialize_any_method!{deserialize_f32<$l, $v>()}
     };
     (f64<$l:tt, $v:ident>) => {
         forward_to_deserialize_any_method!{deserialize_f64<$l, $v>()}
     };
+    (f128<$l:tt, $v:ident>) => {
+        forward_to_deserialize_any_method!{deserialize_f128<$l, $v>()}
+    };
     (char<$l:tt, $v:ident>) => {
         forward_to_deserialize_any_method!{deserialize_char<$l, $v>()}
     };