1 files changed, 245 insertions, 0 deletions
diff --git a/vendor/syn/src/derive.rs b/vendor/syn/src/derive.rs
new file mode 100644
index 0000000..25fa4c9
--- /dev/null
+++ b/vendor/syn/src/derive.rs
@@ -0,0 +1,245 @@
+use super::*;
+use crate::punctuated::Punctuated;
+
+ast_struct! {
+    /// Data structure sent to a `proc_macro_derive` macro.
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "derive")))]
+    pub struct DeriveInput {
+        pub attrs: Vec<Attribute>,
+        pub vis: Visibility,
+        pub ident: Ident,
+        pub generics: Generics,
+        pub data: Data,
+    }
+}
+
+ast_enum! {
+    /// The storage of a struct, enum or union data structure.
+    ///
+    /// # Syntax tree enum
+    ///
+    /// This type is a [syntax tree enum].
+    ///
+    /// [syntax tree enum]: Expr#syntax-tree-enums
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "derive")))]
+    pub enum Data {
+        Struct(DataStruct),
+        Enum(DataEnum),
+        Union(DataUnion),
+    }
+}
+
+ast_struct! {
+    /// A struct input to a `proc_macro_derive` macro.
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "derive")))]
+    pub struct DataStruct {
+        pub struct_token: Token![struct],
+        pub fields: Fields,
+        pub semi_token: Option<Token![;]>,
+    }
+}
+
+ast_struct! {
+    /// An enum input to a `proc_macro_derive` macro.
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "derive")))]
+    pub struct DataEnum {
+        pub enum_token: Token![enum],
+        pub brace_token: token::Brace,
+        pub variants: Punctuated<Variant, Token![,]>,
+    }
+}
+
+ast_struct! {
+    /// An untagged union input to a `proc_macro_derive` macro.
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "derive")))]
+    pub struct DataUnion {
+        pub union_token: Token![union],
+        pub fields: FieldsNamed,
+    }
+}
+
+#[cfg(feature = "parsing")]
+pub(crate) mod parsing {
+    use super::*;
+    use crate::parse::{Parse, ParseStream, Result};
+
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+    impl Parse for DeriveInput {
+        fn parse(input: ParseStream) -> Result<Self> {
+            let attrs = input.call(Attribute::parse_outer)?;
+            let vis = input.parse::<Visibility>()?;
+
+            let lookahead = input.lookahead1();
+            if lookahead.peek(Token![struct]) {
+                let struct_token = input.parse::<Token![struct]>()?;
+                let ident = input.parse::<Ident>()?;
+                let generics = input.parse::<Generics>()?;
+                let (where_clause, fields, semi) = data_struct(input)?;
+                Ok(DeriveInput {
+                    attrs,
+                    vis,
+                    ident,
+                    generics: Generics {
+                        where_clause,
+                        ..generics
+                    },
+                    data: Data::Struct(DataStruct {
+                        struct_token,
+                        fields,
+                        semi_token: semi,
+                    }),
+                })
+            } else if lookahead.peek(Token![enum]) {
+                let enum_token = input.parse::<Token![enum]>()?;
+                let ident = input.parse::<Ident>()?;
+                let generics = input.parse::<Generics>()?;
+                let (where_clause, brace, variants) = data_enum(input)?;
+                Ok(DeriveInput {
+                    attrs,
+                    vis,
+                    ident,
+                    generics: Generics {
+                        where_clause,
+                        ..generics
+                    },
+                    data: Data::Enum(DataEnum {
+                        enum_token,
+                        brace_token: brace,
+                        variants,
+                    }),
+                })
+            } else if lookahead.peek(Token![union]) {
+                let union_token = input.parse::<Token![union]>()?;
+                let ident = input.parse::<Ident>()?;
+                let generics = input.parse::<Generics>()?;
+                let (where_clause, fields) = data_union(input)?;
+                Ok(DeriveInput {
+                    attrs,
+                    vis,
+                    ident,
+                    generics: Generics {
+                        where_clause,
+                        ..generics
+                    },
+                    data: Data::Union(DataUnion {
+                        union_token,
+                        fields,
+                    }),
+                })
+            } else {
+                Err(lookahead.error())
+            }
+        }
+    }
+
+    pub(crate) fn data_struct(
+        input: ParseStream,
+    ) -> Result<(Option<WhereClause>, Fields, Option<Token![;]>)> {
+        let mut lookahead = input.lookahead1();
+        let mut where_clause = None;
+        if lookahead.peek(Token![where]) {
+            where_clause = Some(input.parse()?);
+            lookahead = input.lookahead1();
+        }
+
+        if where_clause.is_none() && lookahead.peek(token::Paren) {
+            let fields = input.parse()?;
+
+            lookahead = input.lookahead1();
+            if lookahead.peek(Token![where]) {
+                where_clause = Some(input.parse()?);
+                lookahead = input.lookahead1();
+            }
+
+            if lookahead.peek(Token![;]) {
+                let semi = input.parse()?;
+                Ok((where_clause, Fields::Unnamed(fields), Some(semi)))
+            } else {
+                Err(lookahead.error())
+            }
+        } else if lookahead.peek(token::Brace) {
+            let fields = input.parse()?;
+            Ok((where_clause, Fields::Named(fields), None))
+        } else if lookahead.peek(Token![;]) {
+            let semi = input.parse()?;
+            Ok((where_clause, Fields::Unit, Some(semi)))
+        } else {
+            Err(lookahead.error())
+        }
+    }
+
+    pub(crate) fn data_enum(
+        input: ParseStream,
+    ) -> Result<(
+        Option<WhereClause>,
+        token::Brace,
+        Punctuated<Variant, Token![,]>,
+    )> {
+        let where_clause = input.parse()?;
+
+        let content;
+        let brace = braced!(content in input);
+        let variants = content.parse_terminated(Variant::parse, Token![,])?;
+
+        Ok((where_clause, brace, variants))
+    }
+
+    pub(crate) fn data_union(input: ParseStream) -> Result<(Option<WhereClause>, FieldsNamed)> {
+        let where_clause = input.parse()?;
+        let fields = input.parse()?;
+        Ok((where_clause, fields))
+    }
+}
+
+#[cfg(feature = "printing")]
+mod printing {
+    use super::*;
+    use crate::attr::FilterAttrs;
+    use crate::print::TokensOrDefault;
+    use proc_macro2::TokenStream;
+    use quote::ToTokens;
+
+    #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+    impl ToTokens for DeriveInput {
+        fn to_tokens(&self, tokens: &mut TokenStream) {
+            for attr in self.attrs.outer() {
+                attr.to_tokens(tokens);
+            }
+            self.vis.to_tokens(tokens);
+            match &self.data {
+                Data::Struct(d) => d.struct_token.to_tokens(tokens),
+                Data::Enum(d) => d.enum_token.to_tokens(tokens),
+                Data::Union(d) => d.union_token.to_tokens(tokens),
+            }
+            self.ident.to_tokens(tokens);
+            self.generics.to_tokens(tokens);
+            match &self.data {
+                Data::Struct(data) => match &data.fields {
+                    Fields::Named(fields) => {
+                        self.generics.where_clause.to_tokens(tokens);
+                        fields.to_tokens(tokens);
+                    }
+                    Fields::Unnamed(fields) => {
+                        fields.to_tokens(tokens);
+                        self.generics.where_clause.to_tokens(tokens);
+                        TokensOrDefault(&data.semi_token).to_tokens(tokens);
+                    }
+                    Fields::Unit => {
+                        self.generics.where_clause.to_tokens(tokens);
+                        TokensOrDefault(&data.semi_token).to_tokens(tokens);
+                    }
+                },
+                Data::Enum(data) => {
+                    self.generics.where_clause.to_tokens(tokens);
+                    data.brace_token.surround(tokens, |tokens| {
+                        data.variants.to_tokens(tokens);
+                    });
+                }
+                Data::Union(data) => {
+                    self.generics.where_clause.to_tokens(tokens);
+                    data.fields.to_tokens(tokens);
+                }
+            }
+        }
+    }
+}