Release 1.0.15

Support deserializing internally tagged enum from seq

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "1.0.14" # remember to update html_root_url
+version = "1.0.15" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"

serde/src/lib.rs

@@ -79,7 +79,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 // Serde types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/serde/1.0.14")]
+#![doc(html_root_url = "https://docs.rs/serde/1.0.15")]
 
 // Support using Serde without the standard library!
 #![cfg_attr(not(feature = "std"), no_std)]

serde/src/private/de.rs

@@ -834,26 +834,43 @@ mod content {
         type Value = TaggedContent<'de, T>;
 
         fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-            fmt.write_str("any value")
+            fmt.write_str("internally tagged enum")
         }
 
-        fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
+        fn visit_seq<S>(self, mut seq: S) -> Result<Self::Value, S::Error>
         where
-            V: MapAccess<'de>,
+            S: SeqAccess<'de>,
+        {
+            let tag = match try!(seq.next_element()) {
+                Some(tag) => tag,
+                None => {
+                    return Err(de::Error::missing_field(self.tag_name));
+                }
+            };
+            let rest = de::value::SeqAccessDeserializer::new(seq);
+            Ok(TaggedContent {
+                tag: tag,
+                content: try!(Content::deserialize(rest)),
+            })
+        }
+
+        fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
+        where
+            M: MapAccess<'de>,
         {
             let mut tag = None;
-            let mut vec = Vec::with_capacity(size_hint::cautious(visitor.size_hint()));
+            let mut vec = Vec::with_capacity(size_hint::cautious(map.size_hint()));
             while let Some(k) =
-                try!(visitor.next_key_seed(TagOrContentVisitor::new(self.tag_name))) {
+                try!(map.next_key_seed(TagOrContentVisitor::new(self.tag_name))) {
                 match k {
                     TagOrContent::Tag => {
                         if tag.is_some() {
                             return Err(de::Error::duplicate_field(self.tag_name));
                         }
-                        tag = Some(try!(visitor.next_value()));
+                        tag = Some(try!(map.next_value()));
                     }
                     TagOrContent::Content(k) => {
-                        let v = try!(visitor.next_value());
+                        let v = try!(map.next_value());
                         vec.push((k, v));
                     }
                 }
@@ -1802,9 +1819,16 @@ mod content {
             write!(formatter, "unit variant {}::{}", self.type_name, self.variant_name)
         }
 
-        fn visit_map<V>(self, _: V) -> Result<(), V::Error>
+        fn visit_seq<S>(self, _: S) -> Result<(), S::Error>
         where
-            V: MapAccess<'de>,
+            S: SeqAccess<'de>,
+        {
+            Ok(())
+        }
+
+        fn visit_map<M>(self, _: M) -> Result<(), M::Error>
+        where
+            M: MapAccess<'de>,
         {
             Ok(())
         }

serde_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive"
-version = "1.0.14" # remember to update html_root_url
+version = "1.0.15" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros 1.1 implementation of #[derive(Serialize, Deserialize)]"

serde_derive/src/de.rs

@@ -222,7 +222,7 @@ fn deserialize_body(cont: &Container, params: &Parameters) -> Fragment {
                 if fields.iter().any(|field| field.ident.is_none()) {
                     panic!("struct has unnamed fields");
                 }
-                deserialize_struct(None, params, fields, &cont.attrs, None)
+                deserialize_struct(None, params, fields, &cont.attrs, None, Untagged::No)
             }
             Body::Struct(Style::Tuple, ref fields) |
             Body::Struct(Style::Newtype, ref fields) => {
@@ -488,15 +488,20 @@ fn deserialize_newtype_struct(type_path: &Tokens, params: &Parameters, field: &F
     }
 }
 
+enum Untagged {
+    Yes,
+    No,
+}
+
 fn deserialize_struct(
     variant_ident: Option<&syn::Ident>,
     params: &Parameters,
     fields: &[Field],
     cattrs: &attr::Container,
     deserializer: Option<Tokens>,
+    untagged: Untagged,
 ) -> Fragment {
     let is_enum = variant_ident.is_some();
-    let is_untagged = deserializer.is_some();
 
     let this = &params.this;
     let (de_impl_generics, de_ty_generics, ty_generics, where_clause) = split_with_de_lifetime(params,);
@@ -559,18 +564,19 @@ fn deserialize_struct(
         quote!(mut __seq)
     };
 
-    let visit_seq = if is_untagged {
-        // untagged struct variants do not get a visit_seq method
-        None
-    } else {
-        Some(quote! {
-            #[inline]
-            fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::export::Result<Self::Value, __A::Error>
-                where __A: _serde::de::SeqAccess<#delife>
-            {
-                #visit_seq
-            }
-        })
+    // untagged struct variants do not get a visit_seq method
+    let visit_seq = match untagged {
+        Untagged::Yes => None,
+        Untagged::No => {
+            Some(quote! {
+                #[inline]
+                fn visit_seq<__A>(self, #visitor_var: __A) -> _serde::export::Result<Self::Value, __A::Error>
+                    where __A: _serde::de::SeqAccess<#delife>
+                {
+                    #visit_seq
+                }
+            })
+        }
     };
 
     quote_block! {
@@ -1148,7 +1154,7 @@ fn deserialize_externally_tagged_variant(
             deserialize_tuple(Some(variant_ident), params, &variant.fields, cattrs, None)
         }
         Style::Struct => {
-            deserialize_struct(Some(variant_ident), params, &variant.fields, cattrs, None)
+            deserialize_struct(Some(variant_ident), params, &variant.fields, cattrs, None, Untagged::No)
         }
     }
 }
@@ -1175,8 +1181,23 @@ fn deserialize_internally_tagged_variant(
                 _serde::export::Ok(#this::#variant_ident)
             }
         }
-        Style::Newtype | Style::Struct => {
-            deserialize_untagged_variant(params, variant, cattrs, deserializer)
+        Style::Newtype => {
+            deserialize_untagged_newtype_variant(
+                variant_ident,
+                params,
+                &variant.fields[0],
+                deserializer,
+            )
+        }
+        Style::Struct => {
+            deserialize_struct(
+                Some(variant_ident),
+                params,
+                &variant.fields,
+                cattrs,
+                Some(deserializer),
+                Untagged::No,
+            )
         }
         Style::Tuple => unreachable!("checked in serde_derive_internals"),
     }
@@ -1238,6 +1259,7 @@ fn deserialize_untagged_variant(
                 &variant.fields,
                 cattrs,
                 Some(deserializer),
+                Untagged::Yes,
             )
         }
     }

serde_derive/src/lib.rs

@@ -16,7 +16,7 @@
 //!
 //! [https://serde.rs/derive.html]: https://serde.rs/derive.html
 
-#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.14")]
+#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.15")]
 
 #![cfg_attr(feature = "cargo-clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "cargo-clippy", allow(used_underscore_binding))]

serde_test/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_test"
-version = "1.0.14" # remember to update html_root_url
+version = "1.0.15" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Token De/Serializer for testing De/Serialize implementations"

serde_test/src/lib.rs

@@ -155,7 +155,7 @@
 //! # }
 //! ```
 
-#![doc(html_root_url = "https://docs.rs/serde_test/1.0.14")]
+#![doc(html_root_url = "https://docs.rs/serde_test/1.0.15")]
 
 #[macro_use]
 extern crate serde;

test_suite/tests/test_macros.rs

@@ -591,11 +591,10 @@ fn test_internally_tagged_enum() {
     #[serde(tag = "type")]
     enum InternallyTagged {
         A { a: u8 },
-        B { b: u8 },
-        C,
-        D(BTreeMap<String, String>),
-        E(Newtype),
-        F(Struct),
+        B,
+        C(BTreeMap<String, String>),
+        D(Newtype),
+        E(Struct),
     }
 
     assert_tokens(
@@ -613,35 +612,62 @@ fn test_internally_tagged_enum() {
         ],
     );
 
-    assert_tokens(
-        &InternallyTagged::B { b: 2 },
+    assert_de_tokens(
+        &InternallyTagged::A { a: 1 },
         &[
-            Token::Struct { name: "InternallyTagged", len: 2 },
-
-            Token::Str("type"),
-            Token::Str("B"),
-
-            Token::Str("b"),
-            Token::U8(2),
-
-            Token::StructEnd,
+            Token::Seq { len: Some(2) },
+            Token::Str("A"),
+            Token::U8(1),
+            Token::SeqEnd,
         ],
     );
 
     assert_tokens(
-        &InternallyTagged::C,
+        &InternallyTagged::B,
         &[
             Token::Struct { name: "InternallyTagged", len: 1 },
 
             Token::Str("type"),
-            Token::Str("C"),
+            Token::Str("B"),
 
             Token::StructEnd,
         ],
     );
 
+    assert_de_tokens(
+        &InternallyTagged::B,
+        &[
+            Token::Seq { len: Some(1) },
+            Token::Str("B"),
+            Token::SeqEnd,
+        ],
+    );
+
     assert_tokens(
-        &InternallyTagged::D(BTreeMap::new()),
+        &InternallyTagged::C(BTreeMap::new()),
+        &[
+            Token::Map { len: Some(1) },
+
+            Token::Str("type"),
+            Token::Str("C"),
+
+            Token::MapEnd,
+        ],
+    );
+
+    assert_de_tokens_error::<InternallyTagged>(
+        &[
+            Token::Seq { len: Some(2) },
+            Token::Str("C"),
+            Token::Map { len: Some(0) },
+            Token::MapEnd,
+            Token::SeqEnd,
+        ],
+        "invalid type: sequence, expected a map",
+    );
+
+    assert_tokens(
+        &InternallyTagged::D(Newtype(BTreeMap::new())),
         &[
             Token::Map { len: Some(1) },
 
@@ -653,24 +679,12 @@ fn test_internally_tagged_enum() {
     );
 
     assert_tokens(
-        &InternallyTagged::E(Newtype(BTreeMap::new())),
-        &[
-            Token::Map { len: Some(1) },
-
-            Token::Str("type"),
-            Token::Str("E"),
-
-            Token::MapEnd,
-        ],
-    );
-
-    assert_tokens(
-        &InternallyTagged::F(Struct { f: 6 }),
+        &InternallyTagged::E(Struct { f: 6 }),
         &[
             Token::Struct { name: "Struct", len: 2 },
 
             Token::Str("type"),
-            Token::Str("F"),
+            Token::Str("E"),
 
             Token::Str("f"),
             Token::U8(6),
@@ -679,6 +693,16 @@ fn test_internally_tagged_enum() {
         ],
     );
 
+    assert_de_tokens(
+        &InternallyTagged::E(Struct { f: 6 }),
+        &[
+            Token::Seq { len: Some(2) },
+            Token::Str("E"),
+            Token::U8(6),
+            Token::SeqEnd,
+        ],
+    );
+
     assert_de_tokens_error::<InternallyTagged>(
         &[Token::Map { len: Some(0) }, Token::MapEnd],
         "missing field `type`",
@@ -693,7 +717,7 @@ fn test_internally_tagged_enum() {
 
             Token::MapEnd,
         ],
-        "unknown variant `Z`, expected one of `A`, `B`, `C`, `D`, `E`, `F`",
+        "unknown variant `Z`, expected one of `A`, `B`, `C`, `D`, `E`",
     );
 }