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-rw-r--r--syn/src/item.rs3104
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diff --git a/syn/src/item.rs b/syn/src/item.rs
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+++ b/syn/src/item.rs
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+use super::*;
+use crate::derive::{Data, DataEnum, DataStruct, DataUnion, DeriveInput};
+use crate::punctuated::Punctuated;
+use proc_macro2::TokenStream;
+
+#[cfg(feature = "extra-traits")]
+use crate::tt::TokenStreamHelper;
+#[cfg(feature = "extra-traits")]
+use std::hash::{Hash, Hasher};
+#[cfg(feature = "parsing")]
+use std::mem;
+
+ast_enum_of_structs! {
+ /// Things that can appear directly inside of a module or scope.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+ //
+ // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+ // blocked on https://github.com/rust-lang/rust/issues/62833
+ pub enum Item #manual_extra_traits {
+ /// A constant item: `const MAX: u16 = 65535`.
+ Const(ItemConst),
+
+ /// An enum definition: `enum Foo<A, B> { A(A), B(B) }`.
+ Enum(ItemEnum),
+
+ /// An `extern crate` item: `extern crate serde`.
+ ExternCrate(ItemExternCrate),
+
+ /// A free-standing function: `fn process(n: usize) -> Result<()> { ...
+ /// }`.
+ Fn(ItemFn),
+
+ /// A block of foreign items: `extern "C" { ... }`.
+ ForeignMod(ItemForeignMod),
+
+ /// An impl block providing trait or associated items: `impl<A> Trait
+ /// for Data<A> { ... }`.
+ Impl(ItemImpl),
+
+ /// A macro invocation, which includes `macro_rules!` definitions.
+ Macro(ItemMacro),
+
+ /// A 2.0-style declarative macro introduced by the `macro` keyword.
+ Macro2(ItemMacro2),
+
+ /// A module or module declaration: `mod m` or `mod m { ... }`.
+ Mod(ItemMod),
+
+ /// A static item: `static BIKE: Shed = Shed(42)`.
+ Static(ItemStatic),
+
+ /// A struct definition: `struct Foo<A> { x: A }`.
+ Struct(ItemStruct),
+
+ /// A trait definition: `pub trait Iterator { ... }`.
+ Trait(ItemTrait),
+
+ /// A trait alias: `pub trait SharableIterator = Iterator + Sync`.
+ TraitAlias(ItemTraitAlias),
+
+ /// A type alias: `type Result<T> = std::result::Result<T, MyError>`.
+ Type(ItemType),
+
+ /// A union definition: `union Foo<A, B> { x: A, y: B }`.
+ Union(ItemUnion),
+
+ /// A use declaration: `use std::collections::HashMap`.
+ Use(ItemUse),
+
+ /// Tokens forming an item not interpreted by Syn.
+ Verbatim(TokenStream),
+
+ #[doc(hidden)]
+ __Nonexhaustive,
+ }
+}
+
+ast_struct! {
+ /// A constant item: `const MAX: u16 = 65535`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemConst {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub const_token: Token![const],
+ pub ident: Ident,
+ pub colon_token: Token![:],
+ pub ty: Box<Type>,
+ pub eq_token: Token![=],
+ pub expr: Box<Expr>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// An enum definition: `enum Foo<A, B> { A(A), B(B) }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemEnum {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub enum_token: Token![enum],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub brace_token: token::Brace,
+ pub variants: Punctuated<Variant, Token![,]>,
+ }
+}
+
+ast_struct! {
+ /// An `extern crate` item: `extern crate serde`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemExternCrate {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub extern_token: Token![extern],
+ pub crate_token: Token![crate],
+ pub ident: Ident,
+ pub rename: Option<(Token![as], Ident)>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A free-standing function: `fn process(n: usize) -> Result<()> { ...
+ /// }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemFn {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub sig: Signature,
+ pub block: Box<Block>,
+ }
+}
+
+ast_struct! {
+ /// A block of foreign items: `extern "C" { ... }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemForeignMod {
+ pub attrs: Vec<Attribute>,
+ pub abi: Abi,
+ pub brace_token: token::Brace,
+ pub items: Vec<ForeignItem>,
+ }
+}
+
+ast_struct! {
+ /// An impl block providing trait or associated items: `impl<A> Trait
+ /// for Data<A> { ... }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemImpl {
+ pub attrs: Vec<Attribute>,
+ pub defaultness: Option<Token![default]>,
+ pub unsafety: Option<Token![unsafe]>,
+ pub impl_token: Token![impl],
+ pub generics: Generics,
+ /// Trait this impl implements.
+ pub trait_: Option<(Option<Token![!]>, Path, Token![for])>,
+ /// The Self type of the impl.
+ pub self_ty: Box<Type>,
+ pub brace_token: token::Brace,
+ pub items: Vec<ImplItem>,
+ }
+}
+
+ast_struct! {
+ /// A macro invocation, which includes `macro_rules!` definitions.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemMacro {
+ pub attrs: Vec<Attribute>,
+ /// The `example` in `macro_rules! example { ... }`.
+ pub ident: Option<Ident>,
+ pub mac: Macro,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+ast_struct! {
+ /// A 2.0-style declarative macro introduced by the `macro` keyword.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemMacro2 #manual_extra_traits {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub macro_token: Token![macro],
+ pub ident: Ident,
+ pub rules: TokenStream,
+ }
+}
+
+ast_struct! {
+ /// A module or module declaration: `mod m` or `mod m { ... }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemMod {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub mod_token: Token![mod],
+ pub ident: Ident,
+ pub content: Option<(token::Brace, Vec<Item>)>,
+ pub semi: Option<Token![;]>,
+ }
+}
+
+ast_struct! {
+ /// A static item: `static BIKE: Shed = Shed(42)`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemStatic {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub static_token: Token![static],
+ pub mutability: Option<Token![mut]>,
+ pub ident: Ident,
+ pub colon_token: Token![:],
+ pub ty: Box<Type>,
+ pub eq_token: Token![=],
+ pub expr: Box<Expr>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A struct definition: `struct Foo<A> { x: A }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemStruct {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub struct_token: Token![struct],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub fields: Fields,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+ast_struct! {
+ /// A trait definition: `pub trait Iterator { ... }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemTrait {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub unsafety: Option<Token![unsafe]>,
+ pub auto_token: Option<Token![auto]>,
+ pub trait_token: Token![trait],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub colon_token: Option<Token![:]>,
+ pub supertraits: Punctuated<TypeParamBound, Token![+]>,
+ pub brace_token: token::Brace,
+ pub items: Vec<TraitItem>,
+ }
+}
+
+ast_struct! {
+ /// A trait alias: `pub trait SharableIterator = Iterator + Sync`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemTraitAlias {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub trait_token: Token![trait],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub eq_token: Token![=],
+ pub bounds: Punctuated<TypeParamBound, Token![+]>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A type alias: `type Result<T> = std::result::Result<T, MyError>`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemType {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub type_token: Token![type],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub eq_token: Token![=],
+ pub ty: Box<Type>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A union definition: `union Foo<A, B> { x: A, y: B }`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemUnion {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub union_token: Token![union],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub fields: FieldsNamed,
+ }
+}
+
+ast_struct! {
+ /// A use declaration: `use std::collections::HashMap`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ItemUse {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub use_token: Token![use],
+ pub leading_colon: Option<Token![::]>,
+ pub tree: UseTree,
+ pub semi_token: Token![;],
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Eq for Item {}
+
+#[cfg(feature = "extra-traits")]
+impl PartialEq for Item {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (Item::Const(this), Item::Const(other)) => this == other,
+ (Item::Enum(this), Item::Enum(other)) => this == other,
+ (Item::ExternCrate(this), Item::ExternCrate(other)) => this == other,
+ (Item::Fn(this), Item::Fn(other)) => this == other,
+ (Item::ForeignMod(this), Item::ForeignMod(other)) => this == other,
+ (Item::Impl(this), Item::Impl(other)) => this == other,
+ (Item::Macro(this), Item::Macro(other)) => this == other,
+ (Item::Macro2(this), Item::Macro2(other)) => this == other,
+ (Item::Mod(this), Item::Mod(other)) => this == other,
+ (Item::Static(this), Item::Static(other)) => this == other,
+ (Item::Struct(this), Item::Struct(other)) => this == other,
+ (Item::Trait(this), Item::Trait(other)) => this == other,
+ (Item::TraitAlias(this), Item::TraitAlias(other)) => this == other,
+ (Item::Type(this), Item::Type(other)) => this == other,
+ (Item::Union(this), Item::Union(other)) => this == other,
+ (Item::Use(this), Item::Use(other)) => this == other,
+ (Item::Verbatim(this), Item::Verbatim(other)) => {
+ TokenStreamHelper(this) == TokenStreamHelper(other)
+ }
+ _ => false,
+ }
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Hash for Item {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ match self {
+ Item::Const(item) => {
+ state.write_u8(0);
+ item.hash(state);
+ }
+ Item::Enum(item) => {
+ state.write_u8(1);
+ item.hash(state);
+ }
+ Item::ExternCrate(item) => {
+ state.write_u8(2);
+ item.hash(state);
+ }
+ Item::Fn(item) => {
+ state.write_u8(3);
+ item.hash(state);
+ }
+ Item::ForeignMod(item) => {
+ state.write_u8(4);
+ item.hash(state);
+ }
+ Item::Impl(item) => {
+ state.write_u8(5);
+ item.hash(state);
+ }
+ Item::Macro(item) => {
+ state.write_u8(6);
+ item.hash(state);
+ }
+ Item::Macro2(item) => {
+ state.write_u8(7);
+ item.hash(state);
+ }
+ Item::Mod(item) => {
+ state.write_u8(8);
+ item.hash(state);
+ }
+ Item::Static(item) => {
+ state.write_u8(9);
+ item.hash(state);
+ }
+ Item::Struct(item) => {
+ state.write_u8(10);
+ item.hash(state);
+ }
+ Item::Trait(item) => {
+ state.write_u8(11);
+ item.hash(state);
+ }
+ Item::TraitAlias(item) => {
+ state.write_u8(12);
+ item.hash(state);
+ }
+ Item::Type(item) => {
+ state.write_u8(13);
+ item.hash(state);
+ }
+ Item::Union(item) => {
+ state.write_u8(14);
+ item.hash(state);
+ }
+ Item::Use(item) => {
+ state.write_u8(15);
+ item.hash(state);
+ }
+ Item::Verbatim(item) => {
+ state.write_u8(16);
+ TokenStreamHelper(item).hash(state);
+ }
+ Item::__Nonexhaustive => unreachable!(),
+ }
+ }
+}
+
+impl Item {
+ #[cfg(feature = "parsing")]
+ pub(crate) fn replace_attrs(&mut self, new: Vec<Attribute>) -> Vec<Attribute> {
+ match self {
+ Item::ExternCrate(ItemExternCrate { attrs, .. })
+ | Item::Use(ItemUse { attrs, .. })
+ | Item::Static(ItemStatic { attrs, .. })
+ | Item::Const(ItemConst { attrs, .. })
+ | Item::Fn(ItemFn { attrs, .. })
+ | Item::Mod(ItemMod { attrs, .. })
+ | Item::ForeignMod(ItemForeignMod { attrs, .. })
+ | Item::Type(ItemType { attrs, .. })
+ | Item::Struct(ItemStruct { attrs, .. })
+ | Item::Enum(ItemEnum { attrs, .. })
+ | Item::Union(ItemUnion { attrs, .. })
+ | Item::Trait(ItemTrait { attrs, .. })
+ | Item::TraitAlias(ItemTraitAlias { attrs, .. })
+ | Item::Impl(ItemImpl { attrs, .. })
+ | Item::Macro(ItemMacro { attrs, .. })
+ | Item::Macro2(ItemMacro2 { attrs, .. }) => mem::replace(attrs, new),
+ Item::Verbatim(_) => Vec::new(),
+ Item::__Nonexhaustive => unreachable!(),
+ }
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Eq for ItemMacro2 {}
+
+#[cfg(feature = "extra-traits")]
+impl PartialEq for ItemMacro2 {
+ fn eq(&self, other: &Self) -> bool {
+ self.attrs == other.attrs
+ && self.vis == other.vis
+ && self.macro_token == other.macro_token
+ && self.ident == other.ident
+ && TokenStreamHelper(&self.rules) == TokenStreamHelper(&other.rules)
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Hash for ItemMacro2 {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ self.attrs.hash(state);
+ self.vis.hash(state);
+ self.macro_token.hash(state);
+ self.ident.hash(state);
+ TokenStreamHelper(&self.rules).hash(state);
+ }
+}
+
+impl From<DeriveInput> for Item {
+ fn from(input: DeriveInput) -> Item {
+ match input.data {
+ Data::Struct(data) => Item::Struct(ItemStruct {
+ attrs: input.attrs,
+ vis: input.vis,
+ struct_token: data.struct_token,
+ ident: input.ident,
+ generics: input.generics,
+ fields: data.fields,
+ semi_token: data.semi_token,
+ }),
+ Data::Enum(data) => Item::Enum(ItemEnum {
+ attrs: input.attrs,
+ vis: input.vis,
+ enum_token: data.enum_token,
+ ident: input.ident,
+ generics: input.generics,
+ brace_token: data.brace_token,
+ variants: data.variants,
+ }),
+ Data::Union(data) => Item::Union(ItemUnion {
+ attrs: input.attrs,
+ vis: input.vis,
+ union_token: data.union_token,
+ ident: input.ident,
+ generics: input.generics,
+ fields: data.fields,
+ }),
+ }
+ }
+}
+
+impl From<ItemStruct> for DeriveInput {
+ fn from(input: ItemStruct) -> DeriveInput {
+ DeriveInput {
+ attrs: input.attrs,
+ vis: input.vis,
+ ident: input.ident,
+ generics: input.generics,
+ data: Data::Struct(DataStruct {
+ struct_token: input.struct_token,
+ fields: input.fields,
+ semi_token: input.semi_token,
+ }),
+ }
+ }
+}
+
+impl From<ItemEnum> for DeriveInput {
+ fn from(input: ItemEnum) -> DeriveInput {
+ DeriveInput {
+ attrs: input.attrs,
+ vis: input.vis,
+ ident: input.ident,
+ generics: input.generics,
+ data: Data::Enum(DataEnum {
+ enum_token: input.enum_token,
+ brace_token: input.brace_token,
+ variants: input.variants,
+ }),
+ }
+ }
+}
+
+impl From<ItemUnion> for DeriveInput {
+ fn from(input: ItemUnion) -> DeriveInput {
+ DeriveInput {
+ attrs: input.attrs,
+ vis: input.vis,
+ ident: input.ident,
+ generics: input.generics,
+ data: Data::Union(DataUnion {
+ union_token: input.union_token,
+ fields: input.fields,
+ }),
+ }
+ }
+}
+
+ast_enum_of_structs! {
+ /// A suffix of an import tree in a `use` item: `Type as Renamed` or `*`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+ //
+ // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+ // blocked on https://github.com/rust-lang/rust/issues/62833
+ pub enum UseTree {
+ /// A path prefix of imports in a `use` item: `std::...`.
+ Path(UsePath),
+
+ /// An identifier imported by a `use` item: `HashMap`.
+ Name(UseName),
+
+ /// An renamed identifier imported by a `use` item: `HashMap as Map`.
+ Rename(UseRename),
+
+ /// A glob import in a `use` item: `*`.
+ Glob(UseGlob),
+
+ /// A braced group of imports in a `use` item: `{A, B, C}`.
+ Group(UseGroup),
+ }
+}
+
+ast_struct! {
+ /// A path prefix of imports in a `use` item: `std::...`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct UsePath {
+ pub ident: Ident,
+ pub colon2_token: Token![::],
+ pub tree: Box<UseTree>,
+ }
+}
+
+ast_struct! {
+ /// An identifier imported by a `use` item: `HashMap`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct UseName {
+ pub ident: Ident,
+ }
+}
+
+ast_struct! {
+ /// An renamed identifier imported by a `use` item: `HashMap as Map`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct UseRename {
+ pub ident: Ident,
+ pub as_token: Token![as],
+ pub rename: Ident,
+ }
+}
+
+ast_struct! {
+ /// A glob import in a `use` item: `*`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct UseGlob {
+ pub star_token: Token![*],
+ }
+}
+
+ast_struct! {
+ /// A braced group of imports in a `use` item: `{A, B, C}`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct UseGroup {
+ pub brace_token: token::Brace,
+ pub items: Punctuated<UseTree, Token![,]>,
+ }
+}
+
+ast_enum_of_structs! {
+ /// An item within an `extern` block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+ //
+ // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+ // blocked on https://github.com/rust-lang/rust/issues/62833
+ pub enum ForeignItem #manual_extra_traits {
+ /// A foreign function in an `extern` block.
+ Fn(ForeignItemFn),
+
+ /// A foreign static item in an `extern` block: `static ext: u8`.
+ Static(ForeignItemStatic),
+
+ /// A foreign type in an `extern` block: `type void`.
+ Type(ForeignItemType),
+
+ /// A macro invocation within an extern block.
+ Macro(ForeignItemMacro),
+
+ /// Tokens in an `extern` block not interpreted by Syn.
+ Verbatim(TokenStream),
+
+ #[doc(hidden)]
+ __Nonexhaustive,
+ }
+}
+
+ast_struct! {
+ /// A foreign function in an `extern` block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ForeignItemFn {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub sig: Signature,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A foreign static item in an `extern` block: `static ext: u8`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ForeignItemStatic {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub static_token: Token![static],
+ pub mutability: Option<Token![mut]>,
+ pub ident: Ident,
+ pub colon_token: Token![:],
+ pub ty: Box<Type>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A foreign type in an `extern` block: `type void`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ForeignItemType {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub type_token: Token![type],
+ pub ident: Ident,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A macro invocation within an extern block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ForeignItemMacro {
+ pub attrs: Vec<Attribute>,
+ pub mac: Macro,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Eq for ForeignItem {}
+
+#[cfg(feature = "extra-traits")]
+impl PartialEq for ForeignItem {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (ForeignItem::Fn(this), ForeignItem::Fn(other)) => this == other,
+ (ForeignItem::Static(this), ForeignItem::Static(other)) => this == other,
+ (ForeignItem::Type(this), ForeignItem::Type(other)) => this == other,
+ (ForeignItem::Macro(this), ForeignItem::Macro(other)) => this == other,
+ (ForeignItem::Verbatim(this), ForeignItem::Verbatim(other)) => {
+ TokenStreamHelper(this) == TokenStreamHelper(other)
+ }
+ _ => false,
+ }
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Hash for ForeignItem {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ match self {
+ ForeignItem::Fn(item) => {
+ state.write_u8(0);
+ item.hash(state);
+ }
+ ForeignItem::Static(item) => {
+ state.write_u8(1);
+ item.hash(state);
+ }
+ ForeignItem::Type(item) => {
+ state.write_u8(2);
+ item.hash(state);
+ }
+ ForeignItem::Macro(item) => {
+ state.write_u8(3);
+ item.hash(state);
+ }
+ ForeignItem::Verbatim(item) => {
+ state.write_u8(4);
+ TokenStreamHelper(item).hash(state);
+ }
+ ForeignItem::__Nonexhaustive => unreachable!(),
+ }
+ }
+}
+
+ast_enum_of_structs! {
+ /// An item declaration within the definition of a trait.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+ //
+ // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+ // blocked on https://github.com/rust-lang/rust/issues/62833
+ pub enum TraitItem #manual_extra_traits {
+ /// An associated constant within the definition of a trait.
+ Const(TraitItemConst),
+
+ /// A trait method within the definition of a trait.
+ Method(TraitItemMethod),
+
+ /// An associated type within the definition of a trait.
+ Type(TraitItemType),
+
+ /// A macro invocation within the definition of a trait.
+ Macro(TraitItemMacro),
+
+ /// Tokens within the definition of a trait not interpreted by Syn.
+ Verbatim(TokenStream),
+
+ #[doc(hidden)]
+ __Nonexhaustive,
+ }
+}
+
+ast_struct! {
+ /// An associated constant within the definition of a trait.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct TraitItemConst {
+ pub attrs: Vec<Attribute>,
+ pub const_token: Token![const],
+ pub ident: Ident,
+ pub colon_token: Token![:],
+ pub ty: Type,
+ pub default: Option<(Token![=], Expr)>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A trait method within the definition of a trait.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct TraitItemMethod {
+ pub attrs: Vec<Attribute>,
+ pub sig: Signature,
+ pub default: Option<Block>,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+ast_struct! {
+ /// An associated type within the definition of a trait.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct TraitItemType {
+ pub attrs: Vec<Attribute>,
+ pub type_token: Token![type],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub colon_token: Option<Token![:]>,
+ pub bounds: Punctuated<TypeParamBound, Token![+]>,
+ pub default: Option<(Token![=], Type)>,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A macro invocation within the definition of a trait.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct TraitItemMacro {
+ pub attrs: Vec<Attribute>,
+ pub mac: Macro,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Eq for TraitItem {}
+
+#[cfg(feature = "extra-traits")]
+impl PartialEq for TraitItem {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (TraitItem::Const(this), TraitItem::Const(other)) => this == other,
+ (TraitItem::Method(this), TraitItem::Method(other)) => this == other,
+ (TraitItem::Type(this), TraitItem::Type(other)) => this == other,
+ (TraitItem::Macro(this), TraitItem::Macro(other)) => this == other,
+ (TraitItem::Verbatim(this), TraitItem::Verbatim(other)) => {
+ TokenStreamHelper(this) == TokenStreamHelper(other)
+ }
+ _ => false,
+ }
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Hash for TraitItem {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ match self {
+ TraitItem::Const(item) => {
+ state.write_u8(0);
+ item.hash(state);
+ }
+ TraitItem::Method(item) => {
+ state.write_u8(1);
+ item.hash(state);
+ }
+ TraitItem::Type(item) => {
+ state.write_u8(2);
+ item.hash(state);
+ }
+ TraitItem::Macro(item) => {
+ state.write_u8(3);
+ item.hash(state);
+ }
+ TraitItem::Verbatim(item) => {
+ state.write_u8(4);
+ TokenStreamHelper(item).hash(state);
+ }
+ TraitItem::__Nonexhaustive => unreachable!(),
+ }
+ }
+}
+
+ast_enum_of_structs! {
+ /// An item within an impl block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: enum.Expr.html#syntax-tree-enums
+ //
+ // TODO: change syntax-tree-enum link to an intra rustdoc link, currently
+ // blocked on https://github.com/rust-lang/rust/issues/62833
+ pub enum ImplItem #manual_extra_traits {
+ /// An associated constant within an impl block.
+ Const(ImplItemConst),
+
+ /// A method within an impl block.
+ Method(ImplItemMethod),
+
+ /// An associated type within an impl block.
+ Type(ImplItemType),
+
+ /// A macro invocation within an impl block.
+ Macro(ImplItemMacro),
+
+ /// Tokens within an impl block not interpreted by Syn.
+ Verbatim(TokenStream),
+
+ #[doc(hidden)]
+ __Nonexhaustive,
+ }
+}
+
+ast_struct! {
+ /// An associated constant within an impl block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ImplItemConst {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub defaultness: Option<Token![default]>,
+ pub const_token: Token![const],
+ pub ident: Ident,
+ pub colon_token: Token![:],
+ pub ty: Type,
+ pub eq_token: Token![=],
+ pub expr: Expr,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A method within an impl block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ImplItemMethod {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub defaultness: Option<Token![default]>,
+ pub sig: Signature,
+ pub block: Block,
+ }
+}
+
+ast_struct! {
+ /// An associated type within an impl block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ImplItemType {
+ pub attrs: Vec<Attribute>,
+ pub vis: Visibility,
+ pub defaultness: Option<Token![default]>,
+ pub type_token: Token![type],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub eq_token: Token![=],
+ pub ty: Type,
+ pub semi_token: Token![;],
+ }
+}
+
+ast_struct! {
+ /// A macro invocation within an impl block.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct ImplItemMacro {
+ pub attrs: Vec<Attribute>,
+ pub mac: Macro,
+ pub semi_token: Option<Token![;]>,
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Eq for ImplItem {}
+
+#[cfg(feature = "extra-traits")]
+impl PartialEq for ImplItem {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (ImplItem::Const(this), ImplItem::Const(other)) => this == other,
+ (ImplItem::Method(this), ImplItem::Method(other)) => this == other,
+ (ImplItem::Type(this), ImplItem::Type(other)) => this == other,
+ (ImplItem::Macro(this), ImplItem::Macro(other)) => this == other,
+ (ImplItem::Verbatim(this), ImplItem::Verbatim(other)) => {
+ TokenStreamHelper(this) == TokenStreamHelper(other)
+ }
+ _ => false,
+ }
+ }
+}
+
+#[cfg(feature = "extra-traits")]
+impl Hash for ImplItem {
+ fn hash<H>(&self, state: &mut H)
+ where
+ H: Hasher,
+ {
+ match self {
+ ImplItem::Const(item) => {
+ state.write_u8(0);
+ item.hash(state);
+ }
+ ImplItem::Method(item) => {
+ state.write_u8(1);
+ item.hash(state);
+ }
+ ImplItem::Type(item) => {
+ state.write_u8(2);
+ item.hash(state);
+ }
+ ImplItem::Macro(item) => {
+ state.write_u8(3);
+ item.hash(state);
+ }
+ ImplItem::Verbatim(item) => {
+ state.write_u8(4);
+ TokenStreamHelper(item).hash(state);
+ }
+ ImplItem::__Nonexhaustive => unreachable!(),
+ }
+ }
+}
+
+ast_struct! {
+ /// A function signature in a trait or implementation: `unsafe fn
+ /// initialize(&self)`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct Signature {
+ pub constness: Option<Token![const]>,
+ pub asyncness: Option<Token![async]>,
+ pub unsafety: Option<Token![unsafe]>,
+ pub abi: Option<Abi>,
+ pub fn_token: Token![fn],
+ pub ident: Ident,
+ pub generics: Generics,
+ pub paren_token: token::Paren,
+ pub inputs: Punctuated<FnArg, Token![,]>,
+ pub variadic: Option<Variadic>,
+ pub output: ReturnType,
+ }
+}
+
+impl Signature {
+ /// A method's `self` receiver, such as `&self` or `self: Box<Self>`.
+ pub fn receiver(&self) -> Option<&FnArg> {
+ let arg = self.inputs.first()?;
+ match arg {
+ FnArg::Receiver(_) => Some(arg),
+ FnArg::Typed(PatType { pat, .. }) => {
+ if let Pat::Ident(PatIdent { ident, .. }) = &**pat {
+ if ident == "self" {
+ return Some(arg);
+ }
+ }
+ None
+ }
+ }
+ }
+}
+
+ast_enum_of_structs! {
+ /// An argument in a function signature: the `n: usize` in `fn f(n: usize)`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub enum FnArg {
+ /// The `self` argument of an associated method, whether taken by value
+ /// or by reference.
+ ///
+ /// Note that `self` receivers with a specified type, such as `self:
+ /// Box<Self>`, are parsed as a `FnArg::Typed`.
+ Receiver(Receiver),
+
+ /// A function argument accepted by pattern and type.
+ Typed(PatType),
+ }
+}
+
+ast_struct! {
+ /// The `self` argument of an associated method, whether taken by value
+ /// or by reference.
+ ///
+ /// Note that `self` receivers with a specified type, such as `self:
+ /// Box<Self>`, are parsed as a `FnArg::Typed`.
+ ///
+ /// *This type is available if Syn is built with the `"full"` feature.*
+ pub struct Receiver {
+ pub attrs: Vec<Attribute>,
+ pub reference: Option<(Token![&], Option<Lifetime>)>,
+ pub mutability: Option<Token![mut]>,
+ pub self_token: Token![self],
+ }
+}
+
+impl Receiver {
+ pub fn lifetime(&self) -> Option<&Lifetime> {
+ self.reference.as_ref()?.1.as_ref()
+ }
+}
+
+#[cfg(feature = "parsing")]
+pub mod parsing {
+ use super::*;
+
+ use crate::ext::IdentExt;
+ use crate::parse::discouraged::Speculative;
+ use crate::parse::{Parse, ParseStream, Result};
+ use crate::token::Brace;
+ use proc_macro2::{Delimiter, Group, Punct, Spacing, TokenTree};
+ use std::iter::{self, FromIterator};
+
+ crate::custom_keyword!(existential);
+
+ impl Parse for Item {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let mut attrs = input.call(Attribute::parse_outer)?;
+ let ahead = input.fork();
+ let vis: Visibility = ahead.parse()?;
+
+ let lookahead = ahead.lookahead1();
+ let mut item = if lookahead.peek(Token![extern]) {
+ ahead.parse::<Token![extern]>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(Token![crate]) {
+ input.parse().map(Item::ExternCrate)
+ } else if lookahead.peek(Token![fn]) {
+ input.parse().map(Item::Fn)
+ } else if lookahead.peek(token::Brace) {
+ input.parse().map(Item::ForeignMod)
+ } else if lookahead.peek(LitStr) {
+ ahead.parse::<LitStr>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(token::Brace) {
+ input.parse().map(Item::ForeignMod)
+ } else if lookahead.peek(Token![fn]) {
+ input.parse().map(Item::Fn)
+ } else {
+ Err(lookahead.error())
+ }
+ } else {
+ Err(lookahead.error())
+ }
+ } else if lookahead.peek(Token![use]) {
+ input.parse().map(Item::Use)
+ } else if lookahead.peek(Token![static]) {
+ input.parse().map(Item::Static)
+ } else if lookahead.peek(Token![const]) {
+ ahead.parse::<Token![const]>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
+ input.parse().map(Item::Const)
+ } else if lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![async])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(Item::Fn)
+ } else {
+ Err(lookahead.error())
+ }
+ } else if lookahead.peek(Token![unsafe]) {
+ ahead.parse::<Token![unsafe]>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(Token![trait])
+ || lookahead.peek(Token![auto]) && ahead.peek2(Token![trait])
+ {
+ input.parse().map(Item::Trait)
+ } else if lookahead.peek(Token![impl]) {
+ input.parse().map(Item::Impl)
+ } else if lookahead.peek(Token![async])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(Item::Fn)
+ } else {
+ Err(lookahead.error())
+ }
+ } else if lookahead.peek(Token![async]) || lookahead.peek(Token![fn]) {
+ input.parse().map(Item::Fn)
+ } else if lookahead.peek(Token![mod]) {
+ input.parse().map(Item::Mod)
+ } else if lookahead.peek(Token![type]) {
+ input.parse().map(Item::Type)
+ } else if lookahead.peek(existential) {
+ input.call(item_existential).map(Item::Verbatim)
+ } else if lookahead.peek(Token![struct]) {
+ input.parse().map(Item::Struct)
+ } else if lookahead.peek(Token![enum]) {
+ input.parse().map(Item::Enum)
+ } else if lookahead.peek(Token![union]) && ahead.peek2(Ident) {
+ input.parse().map(Item::Union)
+ } else if lookahead.peek(Token![trait]) {
+ input.call(parse_trait_or_trait_alias)
+ } else if lookahead.peek(Token![auto]) && ahead.peek2(Token![trait]) {
+ input.parse().map(Item::Trait)
+ } else if lookahead.peek(Token![impl])
+ || lookahead.peek(Token![default]) && !ahead.peek2(Token![!])
+ {
+ input.parse().map(Item::Impl)
+ } else if lookahead.peek(Token![macro]) {
+ input.parse().map(Item::Macro2)
+ } else if vis.is_inherited()
+ && (lookahead.peek(Ident)
+ || lookahead.peek(Token![self])
+ || lookahead.peek(Token![super])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![crate])
+ || lookahead.peek(Token![::]))
+ {
+ input.parse().map(Item::Macro)
+ } else {
+ Err(lookahead.error())
+ }?;
+
+ attrs.extend(item.replace_attrs(Vec::new()));
+ item.replace_attrs(attrs);
+ Ok(item)
+ }
+ }
+
+ impl Parse for ItemMacro {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let path = input.call(Path::parse_mod_style)?;
+ let bang_token: Token![!] = input.parse()?;
+ let ident: Option<Ident> = input.parse()?;
+ let (delimiter, tokens) = input.call(mac::parse_delimiter)?;
+ let semi_token: Option<Token![;]> = if !delimiter.is_brace() {
+ Some(input.parse()?)
+ } else {
+ None
+ };
+ Ok(ItemMacro {
+ attrs,
+ ident,
+ mac: Macro {
+ path,
+ bang_token,
+ delimiter,
+ tokens,
+ },
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for ItemMacro2 {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let macro_token: Token![macro] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let mut rules = TokenStream::new();
+
+ let mut lookahead = input.lookahead1();
+ if lookahead.peek(token::Paren) {
+ let paren_content;
+ let paren_token = parenthesized!(paren_content in input);
+ let args: TokenStream = paren_content.parse()?;
+ let mut args = Group::new(Delimiter::Parenthesis, args);
+ args.set_span(paren_token.span);
+ rules.extend(iter::once(TokenTree::Group(args)));
+ lookahead = input.lookahead1();
+ }
+
+ if lookahead.peek(token::Brace) {
+ let brace_content;
+ let brace_token = braced!(brace_content in input);
+ let body: TokenStream = brace_content.parse()?;
+ let mut body = Group::new(Delimiter::Brace, body);
+ body.set_span(brace_token.span);
+ rules.extend(iter::once(TokenTree::Group(body)));
+ } else {
+ return Err(lookahead.error());
+ }
+
+ Ok(ItemMacro2 {
+ attrs,
+ vis,
+ macro_token,
+ ident,
+ rules,
+ })
+ }
+ }
+
+ impl Parse for ItemExternCrate {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ItemExternCrate {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ extern_token: input.parse()?,
+ crate_token: input.parse()?,
+ ident: {
+ if input.peek(Token![self]) {
+ input.call(Ident::parse_any)?
+ } else {
+ input.parse()?
+ }
+ },
+ rename: {
+ if input.peek(Token![as]) {
+ let as_token: Token![as] = input.parse()?;
+ let rename: Ident = if input.peek(Token![_]) {
+ Ident::from(input.parse::<Token![_]>()?)
+ } else {
+ input.parse()?
+ };
+ Some((as_token, rename))
+ } else {
+ None
+ }
+ },
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ItemUse {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ItemUse {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ use_token: input.parse()?,
+ leading_colon: input.parse()?,
+ tree: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for UseTree {
+ fn parse(input: ParseStream) -> Result<UseTree> {
+ let lookahead = input.lookahead1();
+ if lookahead.peek(Ident)
+ || lookahead.peek(Token![self])
+ || lookahead.peek(Token![super])
+ || lookahead.peek(Token![crate])
+ || lookahead.peek(Token![extern])
+ {
+ let ident = input.call(Ident::parse_any)?;
+ if input.peek(Token![::]) {
+ Ok(UseTree::Path(UsePath {
+ ident,
+ colon2_token: input.parse()?,
+ tree: Box::new(input.parse()?),
+ }))
+ } else if input.peek(Token![as]) {
+ Ok(UseTree::Rename(UseRename {
+ ident,
+ as_token: input.parse()?,
+ rename: {
+ if input.peek(Ident) {
+ input.parse()?
+ } else if input.peek(Token![_]) {
+ Ident::from(input.parse::<Token![_]>()?)
+ } else {
+ return Err(input.error("expected identifier or underscore"));
+ }
+ },
+ }))
+ } else {
+ Ok(UseTree::Name(UseName { ident }))
+ }
+ } else if lookahead.peek(Token![*]) {
+ Ok(UseTree::Glob(UseGlob {
+ star_token: input.parse()?,
+ }))
+ } else if lookahead.peek(token::Brace) {
+ let content;
+ Ok(UseTree::Group(UseGroup {
+ brace_token: braced!(content in input),
+ items: content.parse_terminated(UseTree::parse)?,
+ }))
+ } else {
+ Err(lookahead.error())
+ }
+ }
+ }
+
+ impl Parse for ItemStatic {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ItemStatic {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ static_token: input.parse()?,
+ mutability: input.parse()?,
+ ident: input.parse()?,
+ colon_token: input.parse()?,
+ ty: input.parse()?,
+ eq_token: input.parse()?,
+ expr: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ItemConst {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ItemConst {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ const_token: input.parse()?,
+ ident: {
+ let lookahead = input.lookahead1();
+ if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
+ input.call(Ident::parse_any)?
+ } else {
+ return Err(lookahead.error());
+ }
+ },
+ colon_token: input.parse()?,
+ ty: input.parse()?,
+ eq_token: input.parse()?,
+ expr: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ItemFn {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let outer_attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let constness: Option<Token![const]> = input.parse()?;
+ let asyncness: Option<Token![async]> = input.parse()?;
+ let unsafety: Option<Token![unsafe]> = input.parse()?;
+ let abi: Option<Abi> = input.parse()?;
+ let fn_token: Token![fn] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+
+ let content;
+ let paren_token = parenthesized!(content in input);
+ let inputs = parse_fn_args(&content)?;
+ let variadic = inputs.last().as_ref().and_then(get_variadic);
+
+ fn get_variadic(input: &&FnArg) -> Option<Variadic> {
+ if let FnArg::Typed(PatType { ty, .. }) = input {
+ if let Type::Verbatim(tokens) = &**ty {
+ if let Ok(dots) = parse2(tokens.clone()) {
+ return Some(Variadic {
+ attrs: Vec::new(),
+ dots,
+ });
+ }
+ }
+ }
+ None
+ }
+
+ let output: ReturnType = input.parse()?;
+ let where_clause: Option<WhereClause> = input.parse()?;
+
+ let content;
+ let brace_token = braced!(content in input);
+ let inner_attrs = content.call(Attribute::parse_inner)?;
+ let stmts = content.call(Block::parse_within)?;
+
+ Ok(ItemFn {
+ attrs: private::attrs(outer_attrs, inner_attrs),
+ vis,
+ sig: Signature {
+ constness,
+ asyncness,
+ unsafety,
+ abi,
+ fn_token,
+ ident,
+ paren_token,
+ inputs,
+ output,
+ variadic,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ },
+ block: Box::new(Block { brace_token, stmts }),
+ })
+ }
+ }
+
+ impl Parse for FnArg {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+
+ let ahead = input.fork();
+ if let Ok(mut receiver) = ahead.parse::<Receiver>() {
+ if !ahead.peek(Token![:]) {
+ input.advance_to(&ahead);
+ receiver.attrs = attrs;
+ return Ok(FnArg::Receiver(receiver));
+ }
+ }
+
+ let mut typed = input.call(fn_arg_typed)?;
+ typed.attrs = attrs;
+ Ok(FnArg::Typed(typed))
+ }
+ }
+
+ impl Parse for Receiver {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(Receiver {
+ attrs: Vec::new(),
+ reference: {
+ if input.peek(Token![&]) {
+ Some((input.parse()?, input.parse()?))
+ } else {
+ None
+ }
+ },
+ mutability: input.parse()?,
+ self_token: input.parse()?,
+ })
+ }
+ }
+
+ fn parse_fn_args(input: ParseStream) -> Result<Punctuated<FnArg, Token![,]>> {
+ let mut args = Punctuated::new();
+ let mut has_receiver = false;
+ loop {
+ if input.is_empty() {
+ break;
+ }
+ let arg: FnArg = input.parse()?;
+ if let FnArg::Receiver(receiver) = &arg {
+ if has_receiver {
+ return Err(Error::new(
+ receiver.self_token.span,
+ "unexpected second method receiver",
+ ));
+ } else if !args.is_empty() {
+ return Err(Error::new(
+ receiver.self_token.span,
+ "unexpected method receiver",
+ ));
+ }
+ has_receiver = true;
+ }
+ args.push_value(arg);
+ if input.is_empty() {
+ break;
+ }
+ let comma: Token![,] = input.parse()?;
+ args.push_punct(comma);
+ }
+ Ok(args)
+ }
+
+ fn fn_arg_typed(input: ParseStream) -> Result<PatType> {
+ // Hack to parse pre-2018 syntax in
+ // test/ui/rfc-2565-param-attrs/param-attrs-pretty.rs
+ // because the rest of the test case is valuable.
+ if input.peek(Ident) && input.peek2(Token![<]) {
+ let span = input.fork().parse::<Ident>()?.span();
+ return Ok(PatType {
+ attrs: Vec::new(),
+ pat: Box::new(Pat::Wild(PatWild {
+ attrs: Vec::new(),
+ underscore_token: Token![_](span),
+ })),
+ colon_token: Token![:](span),
+ ty: input.parse()?,
+ });
+ }
+
+ Ok(PatType {
+ attrs: Vec::new(),
+ pat: input.parse()?,
+ colon_token: input.parse()?,
+ ty: Box::new(match input.parse::<Option<Token![...]>>()? {
+ Some(dot3) => {
+ let args = vec![
+ TokenTree::Punct(Punct::new('.', Spacing::Joint)),
+ TokenTree::Punct(Punct::new('.', Spacing::Joint)),
+ TokenTree::Punct(Punct::new('.', Spacing::Alone)),
+ ];
+ let tokens = TokenStream::from_iter(args.into_iter().zip(&dot3.spans).map(
+ |(mut arg, span)| {
+ arg.set_span(*span);
+ arg
+ },
+ ));
+ Type::Verbatim(tokens)
+ }
+ None => input.parse()?,
+ }),
+ })
+ }
+
+ impl Parse for ItemMod {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let outer_attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let mod_token: Token![mod] = input.parse()?;
+ let ident: Ident = input.parse()?;
+
+ let lookahead = input.lookahead1();
+ if lookahead.peek(Token![;]) {
+ Ok(ItemMod {
+ attrs: outer_attrs,
+ vis,
+ mod_token,
+ ident,
+ content: None,
+ semi: Some(input.parse()?),
+ })
+ } else if lookahead.peek(token::Brace) {
+ let content;
+ let brace_token = braced!(content in input);
+ let inner_attrs = content.call(Attribute::parse_inner)?;
+
+ let mut items = Vec::new();
+ while !content.is_empty() {
+ items.push(content.parse()?);
+ }
+
+ Ok(ItemMod {
+ attrs: private::attrs(outer_attrs, inner_attrs),
+ vis,
+ mod_token,
+ ident,
+ content: Some((brace_token, items)),
+ semi: None,
+ })
+ } else {
+ Err(lookahead.error())
+ }
+ }
+ }
+
+ impl Parse for ItemForeignMod {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let outer_attrs = input.call(Attribute::parse_outer)?;
+ let abi: Abi = input.parse()?;
+
+ let content;
+ let brace_token = braced!(content in input);
+ let inner_attrs = content.call(Attribute::parse_inner)?;
+ let mut items = Vec::new();
+ while !content.is_empty() {
+ items.push(content.parse()?);
+ }
+
+ Ok(ItemForeignMod {
+ attrs: private::attrs(outer_attrs, inner_attrs),
+ abi,
+ brace_token,
+ items,
+ })
+ }
+ }
+
+ impl Parse for ForeignItem {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let mut attrs = input.call(Attribute::parse_outer)?;
+ let ahead = input.fork();
+ let vis: Visibility = ahead.parse()?;
+
+ let lookahead = ahead.lookahead1();
+ let mut item = if lookahead.peek(Token![fn]) {
+ input.parse().map(ForeignItem::Fn)
+ } else if lookahead.peek(Token![static]) {
+ input.parse().map(ForeignItem::Static)
+ } else if lookahead.peek(Token![type]) {
+ input.parse().map(ForeignItem::Type)
+ } else if vis.is_inherited()
+ && (lookahead.peek(Ident)
+ || lookahead.peek(Token![self])
+ || lookahead.peek(Token![super])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![crate])
+ || lookahead.peek(Token![::]))
+ {
+ input.parse().map(ForeignItem::Macro)
+ } else {
+ Err(lookahead.error())
+ }?;
+
+ {
+ let item_attrs = match &mut item {
+ ForeignItem::Fn(item) => &mut item.attrs,
+ ForeignItem::Static(item) => &mut item.attrs,
+ ForeignItem::Type(item) => &mut item.attrs,
+ ForeignItem::Macro(item) => &mut item.attrs,
+ ForeignItem::Verbatim(_) | ForeignItem::__Nonexhaustive => unreachable!(),
+ };
+ attrs.extend(item_attrs.drain(..));
+ *item_attrs = attrs;
+ }
+
+ Ok(item)
+ }
+ }
+
+ impl Parse for ForeignItemFn {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let fn_token: Token![fn] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+
+ let content;
+ let paren_token = parenthesized!(content in input);
+ let mut inputs = Punctuated::new();
+ let mut variadic = None;
+ while !content.is_empty() {
+ let attrs = content.call(Attribute::parse_outer)?;
+
+ if let Some(dots) = content.parse()? {
+ variadic = Some(Variadic { attrs, dots });
+ break;
+ }
+
+ let mut arg = content.call(fn_arg_typed)?;
+ arg.attrs = attrs;
+ inputs.push_value(FnArg::Typed(arg));
+ if content.is_empty() {
+ break;
+ }
+
+ inputs.push_punct(content.parse()?);
+ }
+
+ let output: ReturnType = input.parse()?;
+ let where_clause: Option<WhereClause> = input.parse()?;
+ let semi_token: Token![;] = input.parse()?;
+
+ Ok(ForeignItemFn {
+ attrs,
+ vis,
+ sig: Signature {
+ constness: None,
+ asyncness: None,
+ unsafety: None,
+ abi: None,
+ fn_token,
+ ident,
+ paren_token,
+ inputs,
+ output,
+ variadic,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ },
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for ForeignItemStatic {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ForeignItemStatic {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ static_token: input.parse()?,
+ mutability: input.parse()?,
+ ident: input.parse()?,
+ colon_token: input.parse()?,
+ ty: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ForeignItemType {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ForeignItemType {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ type_token: input.parse()?,
+ ident: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ForeignItemMacro {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let mac: Macro = input.parse()?;
+ let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
+ None
+ } else {
+ Some(input.parse()?)
+ };
+ Ok(ForeignItemMacro {
+ attrs,
+ mac,
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for ItemType {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ItemType {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ type_token: input.parse()?,
+ ident: input.parse()?,
+ generics: {
+ let mut generics: Generics = input.parse()?;
+ generics.where_clause = input.parse()?;
+ generics
+ },
+ eq_token: input.parse()?,
+ ty: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ #[cfg(not(feature = "printing"))]
+ fn item_existential(input: ParseStream) -> Result<TokenStream> {
+ Err(input.error("existential type is not supported"))
+ }
+
+ #[cfg(feature = "printing")]
+ fn item_existential(input: ParseStream) -> Result<TokenStream> {
+ use crate::attr::FilterAttrs;
+ use quote::{ToTokens, TokenStreamExt};
+
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let existential_token: existential = input.parse()?;
+ let type_token: Token![type] = input.parse()?;
+ let ident: Ident = input.parse()?;
+
+ let mut generics: Generics = input.parse()?;
+ generics.where_clause = input.parse()?;
+
+ let colon_token: Token![:] = input.parse()?;
+
+ let mut bounds = Punctuated::new();
+ while !input.peek(Token![;]) {
+ if !bounds.is_empty() {
+ bounds.push_punct(input.parse::<Token![+]>()?);
+ }
+ bounds.push_value(input.parse::<TypeParamBound>()?);
+ }
+
+ let semi_token: Token![;] = input.parse()?;
+
+ let mut tokens = TokenStream::new();
+ tokens.append_all(attrs.outer());
+ vis.to_tokens(&mut tokens);
+ existential_token.to_tokens(&mut tokens);
+ type_token.to_tokens(&mut tokens);
+ ident.to_tokens(&mut tokens);
+ generics.to_tokens(&mut tokens);
+ generics.where_clause.to_tokens(&mut tokens);
+ if !bounds.is_empty() {
+ colon_token.to_tokens(&mut tokens);
+ bounds.to_tokens(&mut tokens);
+ }
+ semi_token.to_tokens(&mut tokens);
+ Ok(tokens)
+ }
+
+ impl Parse for ItemStruct {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis = input.parse::<Visibility>()?;
+ let struct_token = input.parse::<Token![struct]>()?;
+ let ident = input.parse::<Ident>()?;
+ let generics = input.parse::<Generics>()?;
+ let (where_clause, fields, semi_token) = derive::parsing::data_struct(input)?;
+ Ok(ItemStruct {
+ attrs,
+ vis,
+ struct_token,
+ ident,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ fields,
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for ItemEnum {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis = input.parse::<Visibility>()?;
+ let enum_token = input.parse::<Token![enum]>()?;
+ let ident = input.parse::<Ident>()?;
+ let generics = input.parse::<Generics>()?;
+ let (where_clause, brace_token, variants) = derive::parsing::data_enum(input)?;
+ Ok(ItemEnum {
+ attrs,
+ vis,
+ enum_token,
+ ident,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ brace_token,
+ variants,
+ })
+ }
+ }
+
+ impl Parse for ItemUnion {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis = input.parse::<Visibility>()?;
+ let union_token = input.parse::<Token![union]>()?;
+ let ident = input.parse::<Ident>()?;
+ let generics = input.parse::<Generics>()?;
+ let (where_clause, fields) = derive::parsing::data_union(input)?;
+ Ok(ItemUnion {
+ attrs,
+ vis,
+ union_token,
+ ident,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ fields,
+ })
+ }
+ }
+
+ fn parse_trait_or_trait_alias(input: ParseStream) -> Result<Item> {
+ let (attrs, vis, trait_token, ident, generics) = parse_start_of_trait_alias(input)?;
+ let lookahead = input.lookahead1();
+ if lookahead.peek(token::Brace)
+ || lookahead.peek(Token![:])
+ || lookahead.peek(Token![where])
+ {
+ let unsafety = None;
+ let auto_token = None;
+ parse_rest_of_trait(
+ input,
+ attrs,
+ vis,
+ unsafety,
+ auto_token,
+ trait_token,
+ ident,
+ generics,
+ )
+ .map(Item::Trait)
+ } else if lookahead.peek(Token![=]) {
+ parse_rest_of_trait_alias(input, attrs, vis, trait_token, ident, generics)
+ .map(Item::TraitAlias)
+ } else {
+ Err(lookahead.error())
+ }
+ }
+
+ impl Parse for ItemTrait {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let unsafety: Option<Token![unsafe]> = input.parse()?;
+ let auto_token: Option<Token![auto]> = input.parse()?;
+ let trait_token: Token![trait] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+ parse_rest_of_trait(
+ input,
+ attrs,
+ vis,
+ unsafety,
+ auto_token,
+ trait_token,
+ ident,
+ generics,
+ )
+ }
+ }
+
+ fn parse_rest_of_trait(
+ input: ParseStream,
+ attrs: Vec<Attribute>,
+ vis: Visibility,
+ unsafety: Option<Token![unsafe]>,
+ auto_token: Option<Token![auto]>,
+ trait_token: Token![trait],
+ ident: Ident,
+ mut generics: Generics,
+ ) -> Result<ItemTrait> {
+ let colon_token: Option<Token![:]> = input.parse()?;
+
+ let mut supertraits = Punctuated::new();
+ if colon_token.is_some() {
+ loop {
+ supertraits.push_value(input.parse()?);
+ if input.peek(Token![where]) || input.peek(token::Brace) {
+ break;
+ }
+ supertraits.push_punct(input.parse()?);
+ if input.peek(Token![where]) || input.peek(token::Brace) {
+ break;
+ }
+ }
+ }
+
+ generics.where_clause = input.parse()?;
+
+ let content;
+ let brace_token = braced!(content in input);
+ let mut items = Vec::new();
+ while !content.is_empty() {
+ items.push(content.parse()?);
+ }
+
+ Ok(ItemTrait {
+ attrs,
+ vis,
+ unsafety,
+ auto_token,
+ trait_token,
+ ident,
+ generics,
+ colon_token,
+ supertraits,
+ brace_token,
+ items,
+ })
+ }
+
+ impl Parse for ItemTraitAlias {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let (attrs, vis, trait_token, ident, generics) = parse_start_of_trait_alias(input)?;
+ parse_rest_of_trait_alias(input, attrs, vis, trait_token, ident, generics)
+ }
+ }
+
+ fn parse_start_of_trait_alias(
+ input: ParseStream,
+ ) -> Result<(Vec<Attribute>, Visibility, Token![trait], Ident, Generics)> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let trait_token: Token![trait] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+ Ok((attrs, vis, trait_token, ident, generics))
+ }
+
+ fn parse_rest_of_trait_alias(
+ input: ParseStream,
+ attrs: Vec<Attribute>,
+ vis: Visibility,
+ trait_token: Token![trait],
+ ident: Ident,
+ mut generics: Generics,
+ ) -> Result<ItemTraitAlias> {
+ let eq_token: Token![=] = input.parse()?;
+
+ let mut bounds = Punctuated::new();
+ loop {
+ if input.peek(Token![where]) || input.peek(Token![;]) {
+ break;
+ }
+ bounds.push_value(input.parse()?);
+ if input.peek(Token![where]) || input.peek(Token![;]) {
+ break;
+ }
+ bounds.push_punct(input.parse()?);
+ }
+
+ generics.where_clause = input.parse()?;
+ let semi_token: Token![;] = input.parse()?;
+
+ Ok(ItemTraitAlias {
+ attrs,
+ vis,
+ trait_token,
+ ident,
+ generics,
+ eq_token,
+ bounds,
+ semi_token,
+ })
+ }
+
+ impl Parse for TraitItem {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let mut attrs = input.call(Attribute::parse_outer)?;
+ let ahead = input.fork();
+
+ let lookahead = ahead.lookahead1();
+ let mut item = if lookahead.peek(Token![const]) {
+ ahead.parse::<Token![const]>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(Ident) {
+ input.parse().map(TraitItem::Const)
+ } else if lookahead.peek(Token![async])
+ || lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(TraitItem::Method)
+ } else {
+ Err(lookahead.error())
+ }
+ } else if lookahead.peek(Token![async])
+ || lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(TraitItem::Method)
+ } else if lookahead.peek(Token![type]) {
+ input.parse().map(TraitItem::Type)
+ } else if lookahead.peek(Ident)
+ || lookahead.peek(Token![self])
+ || lookahead.peek(Token![super])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![crate])
+ || lookahead.peek(Token![::])
+ {
+ input.parse().map(TraitItem::Macro)
+ } else {
+ Err(lookahead.error())
+ }?;
+
+ {
+ let item_attrs = match &mut item {
+ TraitItem::Const(item) => &mut item.attrs,
+ TraitItem::Method(item) => &mut item.attrs,
+ TraitItem::Type(item) => &mut item.attrs,
+ TraitItem::Macro(item) => &mut item.attrs,
+ TraitItem::Verbatim(_) | TraitItem::__Nonexhaustive => unreachable!(),
+ };
+ attrs.extend(item_attrs.drain(..));
+ *item_attrs = attrs;
+ }
+
+ Ok(item)
+ }
+ }
+
+ impl Parse for TraitItemConst {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(TraitItemConst {
+ attrs: input.call(Attribute::parse_outer)?,
+ const_token: input.parse()?,
+ ident: input.parse()?,
+ colon_token: input.parse()?,
+ ty: input.parse()?,
+ default: {
+ if input.peek(Token![=]) {
+ let eq_token: Token![=] = input.parse()?;
+ let default: Expr = input.parse()?;
+ Some((eq_token, default))
+ } else {
+ None
+ }
+ },
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for TraitItemMethod {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let outer_attrs = input.call(Attribute::parse_outer)?;
+ let constness: Option<Token![const]> = input.parse()?;
+ let asyncness: Option<Token![async]> = input.parse()?;
+ let unsafety: Option<Token![unsafe]> = input.parse()?;
+ let abi: Option<Abi> = input.parse()?;
+ let fn_token: Token![fn] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+
+ let content;
+ let paren_token = parenthesized!(content in input);
+ let inputs = parse_fn_args(&content)?;
+
+ let output: ReturnType = input.parse()?;
+ let where_clause: Option<WhereClause> = input.parse()?;
+
+ let lookahead = input.lookahead1();
+ let (brace_token, inner_attrs, stmts, semi_token) = if lookahead.peek(token::Brace) {
+ let content;
+ let brace_token = braced!(content in input);
+ let inner_attrs = content.call(Attribute::parse_inner)?;
+ let stmts = content.call(Block::parse_within)?;
+ (Some(brace_token), inner_attrs, stmts, None)
+ } else if lookahead.peek(Token![;]) {
+ let semi_token: Token![;] = input.parse()?;
+ (None, Vec::new(), Vec::new(), Some(semi_token))
+ } else {
+ return Err(lookahead.error());
+ };
+
+ Ok(TraitItemMethod {
+ attrs: private::attrs(outer_attrs, inner_attrs),
+ sig: Signature {
+ constness,
+ asyncness,
+ unsafety,
+ abi,
+ fn_token,
+ ident,
+ paren_token,
+ inputs,
+ output,
+ variadic: None,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ },
+ default: brace_token.map(|brace_token| Block { brace_token, stmts }),
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for TraitItemType {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let type_token: Token![type] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let mut generics: Generics = input.parse()?;
+ let colon_token: Option<Token![:]> = input.parse()?;
+
+ let mut bounds = Punctuated::new();
+ if colon_token.is_some() {
+ while !input.peek(Token![where]) && !input.peek(Token![=]) && !input.peek(Token![;])
+ {
+ if !bounds.is_empty() {
+ bounds.push_punct(input.parse()?);
+ }
+ bounds.push_value(input.parse()?);
+ }
+ }
+
+ generics.where_clause = input.parse()?;
+ let default = if input.peek(Token![=]) {
+ let eq_token: Token![=] = input.parse()?;
+ let default: Type = input.parse()?;
+ Some((eq_token, default))
+ } else {
+ None
+ };
+ let semi_token: Token![;] = input.parse()?;
+
+ Ok(TraitItemType {
+ attrs,
+ type_token,
+ ident,
+ generics,
+ colon_token,
+ bounds,
+ default,
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for TraitItemMacro {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let mac: Macro = input.parse()?;
+ let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
+ None
+ } else {
+ Some(input.parse()?)
+ };
+ Ok(TraitItemMacro {
+ attrs,
+ mac,
+ semi_token,
+ })
+ }
+ }
+
+ impl Parse for ItemImpl {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let outer_attrs = input.call(Attribute::parse_outer)?;
+ let defaultness: Option<Token![default]> = input.parse()?;
+ let unsafety: Option<Token![unsafe]> = input.parse()?;
+ let impl_token: Token![impl] = input.parse()?;
+
+ let has_generics = input.peek(Token![<])
+ && (input.peek2(Token![>])
+ || input.peek2(Token![#])
+ || (input.peek2(Ident) || input.peek2(Lifetime))
+ && (input.peek3(Token![:])
+ || input.peek3(Token![,])
+ || input.peek3(Token![>])));
+ let generics: Generics = if has_generics {
+ input.parse()?
+ } else {
+ Generics::default()
+ };
+
+ let trait_ = (|| -> Option<_> {
+ let ahead = input.fork();
+ let polarity: Option<Token![!]> = ahead.parse().ok()?;
+ let path: Path = ahead.parse().ok()?;
+ let for_token: Token![for] = ahead.parse().ok()?;
+ input.advance_to(&ahead);
+ Some((polarity, path, for_token))
+ })();
+ let self_ty: Type = input.parse()?;
+ let where_clause: Option<WhereClause> = input.parse()?;
+
+ let content;
+ let brace_token = braced!(content in input);
+ let inner_attrs = content.call(Attribute::parse_inner)?;
+
+ let mut items = Vec::new();
+ while !content.is_empty() {
+ items.push(content.parse()?);
+ }
+
+ Ok(ItemImpl {
+ attrs: private::attrs(outer_attrs, inner_attrs),
+ defaultness,
+ unsafety,
+ impl_token,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ trait_,
+ self_ty: Box::new(self_ty),
+ brace_token,
+ items,
+ })
+ }
+ }
+
+ impl Parse for ImplItem {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let mut attrs = input.call(Attribute::parse_outer)?;
+ let ahead = input.fork();
+ let vis: Visibility = ahead.parse()?;
+
+ let mut lookahead = ahead.lookahead1();
+ let defaultness = if lookahead.peek(Token![default]) && !ahead.peek2(Token![!]) {
+ let defaultness: Token![default] = ahead.parse()?;
+ lookahead = ahead.lookahead1();
+ Some(defaultness)
+ } else {
+ None
+ };
+
+ let mut item = if lookahead.peek(Token![const]) {
+ ahead.parse::<Token![const]>()?;
+ let lookahead = ahead.lookahead1();
+ if lookahead.peek(Ident) {
+ input.parse().map(ImplItem::Const)
+ } else if lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![async])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(ImplItem::Method)
+ } else {
+ Err(lookahead.error())
+ }
+ } else if lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![async])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![fn])
+ {
+ input.parse().map(ImplItem::Method)
+ } else if lookahead.peek(Token![type]) {
+ input.parse().map(ImplItem::Type)
+ } else if vis.is_inherited() && defaultness.is_none() && lookahead.peek(existential) {
+ input.call(item_existential).map(ImplItem::Verbatim)
+ } else if vis.is_inherited()
+ && defaultness.is_none()
+ && (lookahead.peek(Ident)
+ || lookahead.peek(Token![self])
+ || lookahead.peek(Token![super])
+ || lookahead.peek(Token![extern])
+ || lookahead.peek(Token![crate])
+ || lookahead.peek(Token![::]))
+ {
+ input.parse().map(ImplItem::Macro)
+ } else {
+ Err(lookahead.error())
+ }?;
+
+ {
+ let item_attrs = match &mut item {
+ ImplItem::Const(item) => &mut item.attrs,
+ ImplItem::Method(item) => &mut item.attrs,
+ ImplItem::Type(item) => &mut item.attrs,
+ ImplItem::Macro(item) => &mut item.attrs,
+ ImplItem::Verbatim(_) => return Ok(item),
+ ImplItem::__Nonexhaustive => unreachable!(),
+ };
+ attrs.extend(item_attrs.drain(..));
+ *item_attrs = attrs;
+ }
+
+ Ok(item)
+ }
+ }
+
+ impl Parse for ImplItemConst {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ImplItemConst {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ defaultness: input.parse()?,
+ const_token: input.parse()?,
+ ident: input.parse()?,
+ colon_token: input.parse()?,
+ ty: input.parse()?,
+ eq_token: input.parse()?,
+ expr: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ImplItemMethod {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let mut attrs = input.call(Attribute::parse_outer)?;
+ let vis: Visibility = input.parse()?;
+ let defaultness: Option<Token![default]> = input.parse()?;
+ let constness: Option<Token![const]> = input.parse()?;
+ let asyncness: Option<Token![async]> = input.parse()?;
+ let unsafety: Option<Token![unsafe]> = input.parse()?;
+ let abi: Option<Abi> = input.parse()?;
+ let fn_token: Token![fn] = input.parse()?;
+ let ident: Ident = input.parse()?;
+ let generics: Generics = input.parse()?;
+
+ let content;
+ let paren_token = parenthesized!(content in input);
+ let inputs = parse_fn_args(&content)?;
+
+ let output: ReturnType = input.parse()?;
+ let where_clause: Option<WhereClause> = input.parse()?;
+
+ let block = if let Some(semi) = input.parse::<Option<Token![;]>>()? {
+ // Accept methods without a body in an impl block because
+ // rustc's *parser* does not reject them (the compilation error
+ // is emitted later than parsing) and it can be useful for macro
+ // DSLs.
+ let mut punct = Punct::new(';', Spacing::Alone);
+ punct.set_span(semi.span);
+ let tokens = TokenStream::from_iter(vec![TokenTree::Punct(punct)]);
+ Block {
+ brace_token: Brace::default(),
+ stmts: vec![Stmt::Item(Item::Verbatim(tokens))],
+ }
+ } else {
+ let content;
+ let brace_token = braced!(content in input);
+ attrs.extend(content.call(Attribute::parse_inner)?);
+ Block {
+ brace_token,
+ stmts: content.call(Block::parse_within)?,
+ }
+ };
+
+ Ok(ImplItemMethod {
+ attrs,
+ vis,
+ defaultness,
+ sig: Signature {
+ constness,
+ asyncness,
+ unsafety,
+ abi,
+ fn_token,
+ ident,
+ paren_token,
+ inputs,
+ output,
+ variadic: None,
+ generics: Generics {
+ where_clause,
+ ..generics
+ },
+ },
+ block,
+ })
+ }
+ }
+
+ impl Parse for ImplItemType {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(ImplItemType {
+ attrs: input.call(Attribute::parse_outer)?,
+ vis: input.parse()?,
+ defaultness: input.parse()?,
+ type_token: input.parse()?,
+ ident: input.parse()?,
+ generics: {
+ let mut generics: Generics = input.parse()?;
+ generics.where_clause = input.parse()?;
+ generics
+ },
+ eq_token: input.parse()?,
+ ty: input.parse()?,
+ semi_token: input.parse()?,
+ })
+ }
+ }
+
+ impl Parse for ImplItemMacro {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let attrs = input.call(Attribute::parse_outer)?;
+ let mac: Macro = input.parse()?;
+ let semi_token: Option<Token![;]> = if mac.delimiter.is_brace() {
+ None
+ } else {
+ Some(input.parse()?)
+ };
+ Ok(ImplItemMacro {
+ attrs,
+ mac,
+ semi_token,
+ })
+ }
+ }
+
+ impl Visibility {
+ fn is_inherited(&self) -> bool {
+ match *self {
+ Visibility::Inherited => true,
+ _ => false,
+ }
+ }
+ }
+
+ impl MacroDelimiter {
+ fn is_brace(&self) -> bool {
+ match *self {
+ MacroDelimiter::Brace(_) => true,
+ MacroDelimiter::Paren(_) | MacroDelimiter::Bracket(_) => false,
+ }
+ }
+ }
+}
+
+#[cfg(feature = "printing")]
+mod printing {
+ use super::*;
+
+ use proc_macro2::TokenStream;
+ use quote::{ToTokens, TokenStreamExt};
+
+ use crate::attr::FilterAttrs;
+ use crate::print::TokensOrDefault;
+
+ impl ToTokens for ItemExternCrate {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.extern_token.to_tokens(tokens);
+ self.crate_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ if let Some((as_token, rename)) = &self.rename {
+ as_token.to_tokens(tokens);
+ rename.to_tokens(tokens);
+ }
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemUse {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.use_token.to_tokens(tokens);
+ self.leading_colon.to_tokens(tokens);
+ self.tree.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemStatic {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.static_token.to_tokens(tokens);
+ self.mutability.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.colon_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.expr.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemConst {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.const_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.colon_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.expr.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemFn {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.sig.to_tokens(tokens);
+ self.block.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(&self.block.stmts);
+ });
+ }
+ }
+
+ impl ToTokens for ItemMod {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.mod_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ if let Some((brace, items)) = &self.content {
+ brace.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(items);
+ });
+ } else {
+ TokensOrDefault(&self.semi).to_tokens(tokens);
+ }
+ }
+ }
+
+ impl ToTokens for ItemForeignMod {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.abi.to_tokens(tokens);
+ self.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(&self.items);
+ });
+ }
+ }
+
+ impl ToTokens for ItemType {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.type_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemEnum {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.enum_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.brace_token.surround(tokens, |tokens| {
+ self.variants.to_tokens(tokens);
+ });
+ }
+ }
+
+ impl ToTokens for ItemStruct {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.struct_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ match &self.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(&self.semi_token).to_tokens(tokens);
+ }
+ Fields::Unit => {
+ self.generics.where_clause.to_tokens(tokens);
+ TokensOrDefault(&self.semi_token).to_tokens(tokens);
+ }
+ }
+ }
+ }
+
+ impl ToTokens for ItemUnion {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.union_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.fields.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemTrait {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.unsafety.to_tokens(tokens);
+ self.auto_token.to_tokens(tokens);
+ self.trait_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ if !self.supertraits.is_empty() {
+ TokensOrDefault(&self.colon_token).to_tokens(tokens);
+ self.supertraits.to_tokens(tokens);
+ }
+ self.generics.where_clause.to_tokens(tokens);
+ self.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(&self.items);
+ });
+ }
+ }
+
+ impl ToTokens for ItemTraitAlias {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.trait_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.bounds.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemImpl {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.defaultness.to_tokens(tokens);
+ self.unsafety.to_tokens(tokens);
+ self.impl_token.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ if let Some((polarity, path, for_token)) = &self.trait_ {
+ polarity.to_tokens(tokens);
+ path.to_tokens(tokens);
+ for_token.to_tokens(tokens);
+ }
+ self.self_ty.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(&self.items);
+ });
+ }
+ }
+
+ impl ToTokens for ItemMacro {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.mac.path.to_tokens(tokens);
+ self.mac.bang_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ match &self.mac.delimiter {
+ MacroDelimiter::Paren(paren) => {
+ paren.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
+ }
+ MacroDelimiter::Brace(brace) => {
+ brace.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
+ }
+ MacroDelimiter::Bracket(bracket) => {
+ bracket.surround(tokens, |tokens| self.mac.tokens.to_tokens(tokens));
+ }
+ }
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ItemMacro2 {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.macro_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.rules.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for UsePath {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.ident.to_tokens(tokens);
+ self.colon2_token.to_tokens(tokens);
+ self.tree.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for UseName {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.ident.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for UseRename {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.ident.to_tokens(tokens);
+ self.as_token.to_tokens(tokens);
+ self.rename.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for UseGlob {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.star_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for UseGroup {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.brace_token.surround(tokens, |tokens| {
+ self.items.to_tokens(tokens);
+ });
+ }
+ }
+
+ impl ToTokens for TraitItemConst {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.const_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.colon_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ if let Some((eq_token, default)) = &self.default {
+ eq_token.to_tokens(tokens);
+ default.to_tokens(tokens);
+ }
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for TraitItemMethod {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.sig.to_tokens(tokens);
+ match &self.default {
+ Some(block) => {
+ block.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(&block.stmts);
+ });
+ }
+ None => {
+ TokensOrDefault(&self.semi_token).to_tokens(tokens);
+ }
+ }
+ }
+ }
+
+ impl ToTokens for TraitItemType {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.type_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ if !self.bounds.is_empty() {
+ TokensOrDefault(&self.colon_token).to_tokens(tokens);
+ self.bounds.to_tokens(tokens);
+ }
+ self.generics.where_clause.to_tokens(tokens);
+ if let Some((eq_token, default)) = &self.default {
+ eq_token.to_tokens(tokens);
+ default.to_tokens(tokens);
+ }
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for TraitItemMacro {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.mac.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ImplItemConst {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.defaultness.to_tokens(tokens);
+ self.const_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.colon_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.expr.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ImplItemMethod {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.defaultness.to_tokens(tokens);
+ self.sig.to_tokens(tokens);
+ if self.block.stmts.len() == 1 {
+ if let Stmt::Item(Item::Verbatim(verbatim)) = &self.block.stmts[0] {
+ if verbatim.to_string() == ";" {
+ verbatim.to_tokens(tokens);
+ return;
+ }
+ }
+ }
+ self.block.brace_token.surround(tokens, |tokens| {
+ tokens.append_all(self.attrs.inner());
+ tokens.append_all(&self.block.stmts);
+ });
+ }
+ }
+
+ impl ToTokens for ImplItemType {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.defaultness.to_tokens(tokens);
+ self.type_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ self.eq_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ImplItemMacro {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.mac.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ForeignItemFn {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.sig.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ForeignItemStatic {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.static_token.to_tokens(tokens);
+ self.mutability.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.colon_token.to_tokens(tokens);
+ self.ty.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ForeignItemType {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.vis.to_tokens(tokens);
+ self.type_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for ForeignItemMacro {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ self.mac.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ }
+ }
+
+ fn has_variadic(inputs: &Punctuated<FnArg, Token![,]>) -> bool {
+ let last = match inputs.last() {
+ Some(last) => last,
+ None => return false,
+ };
+
+ let pat = match last {
+ FnArg::Typed(pat) => pat,
+ FnArg::Receiver(_) => return false,
+ };
+
+ let tokens = match pat.ty.as_ref() {
+ Type::Verbatim(tokens) => tokens,
+ _ => return false,
+ };
+
+ tokens.to_string() == "..."
+ }
+
+ impl ToTokens for Signature {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.constness.to_tokens(tokens);
+ self.asyncness.to_tokens(tokens);
+ self.unsafety.to_tokens(tokens);
+ self.abi.to_tokens(tokens);
+ self.fn_token.to_tokens(tokens);
+ self.ident.to_tokens(tokens);
+ self.generics.to_tokens(tokens);
+ self.paren_token.surround(tokens, |tokens| {
+ self.inputs.to_tokens(tokens);
+ if self.variadic.is_some() && !has_variadic(&self.inputs) {
+ if !self.inputs.empty_or_trailing() {
+ <Token![,]>::default().to_tokens(tokens);
+ }
+ self.variadic.to_tokens(tokens);
+ }
+ });
+ self.output.to_tokens(tokens);
+ self.generics.where_clause.to_tokens(tokens);
+ }
+ }
+
+ impl ToTokens for Receiver {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ if let Some((ampersand, lifetime)) = &self.reference {
+ ampersand.to_tokens(tokens);
+ lifetime.to_tokens(tokens);
+ }
+ self.mutability.to_tokens(tokens);
+ self.self_token.to_tokens(tokens);
+ }
+ }
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-19 03:26:21 +0000