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use crate::attr::Attribute;
use crate::data::{Fields, FieldsNamed, Variant};
use crate::derive::{Data, DataEnum, DataStruct, DataUnion, DeriveInput};
use crate::expr::Expr;
use crate::generics::{Generics, TypeParamBound};
use crate::ident::Ident;
use crate::lifetime::Lifetime;
use crate::mac::Macro;
use crate::pat::{Pat, PatType};
use crate::path::Path;
use crate::punctuated::Punctuated;
use crate::restriction::Visibility;
use crate::stmt::Block;
use crate::token;
use crate::ty::{Abi, ReturnType, Type};
use proc_macro2::TokenStream;
#[cfg(feature = "parsing")]
use std::mem;
ast_enum_of_structs! {
/// Things that can appear directly inside of a module or scope.
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: crate::expr::Expr#syntax-tree-enums
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum Item {
/// 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 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),
// For testing exhaustiveness in downstream code, use the following idiom:
//
// match item {
// #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
//
// Item::Const(item) => {...}
// Item::Enum(item) => {...}
// ...
// Item::Verbatim(item) => {...}
//
// _ => { /* some sane fallback */ }
// }
//
// This way we fail your tests but don't break your library when adding
// a variant. You will be notified by a test failure when a variant is
// added, so that you can add code to handle it, but your library will
// continue to compile and work for downstream users in the interim.
}
}
ast_struct! {
/// A constant item: `const MAX: u16 = 65535`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ItemConst {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub const_token: Token![const],
pub ident: Ident,
pub generics: Generics,
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) }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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<()> { ... }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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" { ... }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ItemForeignMod {
pub attrs: Vec<Attribute>,
pub unsafety: Option<Token![unsafe]>,
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> { ... }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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 module or module declaration: `mod m` or `mod m { ... }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ItemMod {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub unsafety: Option<Token![unsafe]>,
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)`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ItemStatic {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub static_token: Token![static],
pub mutability: StaticMutability,
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 }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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 { ... }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ItemTrait {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub unsafety: Option<Token![unsafe]>,
pub auto_token: Option<Token![auto]>,
pub restriction: Option<ImplRestriction>,
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`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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>`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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 }`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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![;],
}
}
impl Item {
#[cfg(feature = "parsing")]
pub(crate) fn replace_attrs(&mut self, new: Vec<Attribute>) -> Vec<Attribute> {
match self {
Item::Const(ItemConst { attrs, .. })
| Item::Enum(ItemEnum { attrs, .. })
| Item::ExternCrate(ItemExternCrate { attrs, .. })
| Item::Fn(ItemFn { attrs, .. })
| Item::ForeignMod(ItemForeignMod { attrs, .. })
| Item::Impl(ItemImpl { attrs, .. })
| Item::Macro(ItemMacro { attrs, .. })
| Item::Mod(ItemMod { attrs, .. })
| Item::Static(ItemStatic { attrs, .. })
| Item::Struct(ItemStruct { attrs, .. })
| Item::Trait(ItemTrait { attrs, .. })
| Item::TraitAlias(ItemTraitAlias { attrs, .. })
| Item::Type(ItemType { attrs, .. })
| Item::Union(ItemUnion { attrs, .. })
| Item::Use(ItemUse { attrs, .. }) => mem::replace(attrs, new),
Item::Verbatim(_) => Vec::new(),
}
}
}
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 `*`.
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: crate::expr::Expr#syntax-tree-enums
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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::...`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct UsePath {
pub ident: Ident,
pub colon2_token: Token![::],
pub tree: Box<UseTree>,
}
}
ast_struct! {
/// An identifier imported by a `use` item: `HashMap`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct UseName {
pub ident: Ident,
}
}
ast_struct! {
/// An renamed identifier imported by a `use` item: `HashMap as Map`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct UseRename {
pub ident: Ident,
pub as_token: Token![as],
pub rename: Ident,
}
}
ast_struct! {
/// A glob import in a `use` item: `*`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct UseGlob {
pub star_token: Token![*],
}
}
ast_struct! {
/// A braced group of imports in a `use` item: `{A, B, C}`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct UseGroup {
pub brace_token: token::Brace,
pub items: Punctuated<UseTree, Token![,]>,
}
}
ast_enum_of_structs! {
/// An item within an `extern` block.
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: crate::expr::Expr#syntax-tree-enums
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum ForeignItem {
/// 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),
// For testing exhaustiveness in downstream code, use the following idiom:
//
// match item {
// #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
//
// ForeignItem::Fn(item) => {...}
// ForeignItem::Static(item) => {...}
// ...
// ForeignItem::Verbatim(item) => {...}
//
// _ => { /* some sane fallback */ }
// }
//
// This way we fail your tests but don't break your library when adding
// a variant. You will be notified by a test failure when a variant is
// added, so that you can add code to handle it, but your library will
// continue to compile and work for downstream users in the interim.
}
}
ast_struct! {
/// A foreign function in an `extern` block.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ForeignItemStatic {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub static_token: Token![static],
pub mutability: StaticMutability,
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`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ForeignItemType {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub type_token: Token![type],
pub ident: Ident,
pub generics: Generics,
pub semi_token: Token![;],
}
}
ast_struct! {
/// A macro invocation within an extern block.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ForeignItemMacro {
pub attrs: Vec<Attribute>,
pub mac: Macro,
pub semi_token: Option<Token![;]>,
}
}
ast_enum_of_structs! {
/// An item declaration within the definition of a trait.
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: crate::expr::Expr#syntax-tree-enums
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum TraitItem {
/// An associated constant within the definition of a trait.
Const(TraitItemConst),
/// An associated function within the definition of a trait.
Fn(TraitItemFn),
/// 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),
// For testing exhaustiveness in downstream code, use the following idiom:
//
// match item {
// #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
//
// TraitItem::Const(item) => {...}
// TraitItem::Fn(item) => {...}
// ...
// TraitItem::Verbatim(item) => {...}
//
// _ => { /* some sane fallback */ }
// }
//
// This way we fail your tests but don't break your library when adding
// a variant. You will be notified by a test failure when a variant is
// added, so that you can add code to handle it, but your library will
// continue to compile and work for downstream users in the interim.
}
}
ast_struct! {
/// An associated constant within the definition of a trait.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct TraitItemConst {
pub attrs: Vec<Attribute>,
pub const_token: Token![const],
pub ident: Ident,
pub generics: Generics,
pub colon_token: Token![:],
pub ty: Type,
pub default: Option<(Token![=], Expr)>,
pub semi_token: Token![;],
}
}
ast_struct! {
/// An associated function within the definition of a trait.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct TraitItemFn {
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.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct TraitItemMacro {
pub attrs: Vec<Attribute>,
pub mac: Macro,
pub semi_token: Option<Token![;]>,
}
}
ast_enum_of_structs! {
/// An item within an impl block.
///
/// # Syntax tree enum
///
/// This type is a [syntax tree enum].
///
/// [syntax tree enum]: crate::expr::Expr#syntax-tree-enums
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum ImplItem {
/// An associated constant within an impl block.
Const(ImplItemConst),
/// An associated function within an impl block.
Fn(ImplItemFn),
/// 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),
// For testing exhaustiveness in downstream code, use the following idiom:
//
// match item {
// #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
//
// ImplItem::Const(item) => {...}
// ImplItem::Fn(item) => {...}
// ...
// ImplItem::Verbatim(item) => {...}
//
// _ => { /* some sane fallback */ }
// }
//
// This way we fail your tests but don't break your library when adding
// a variant. You will be notified by a test failure when a variant is
// added, so that you can add code to handle it, but your library will
// continue to compile and work for downstream users in the interim.
}
}
ast_struct! {
/// An associated constant within an impl block.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ImplItemConst {
pub attrs: Vec<Attribute>,
pub vis: Visibility,
pub defaultness: Option<Token![default]>,
pub const_token: Token![const],
pub ident: Ident,
pub generics: Generics,
pub colon_token: Token![:],
pub ty: Type,
pub eq_token: Token![=],
pub expr: Expr,
pub semi_token: Token![;],
}
}
ast_struct! {
/// An associated function within an impl block.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ImplItemFn {
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.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct ImplItemMacro {
pub attrs: Vec<Attribute>,
pub mac: Macro,
pub semi_token: Option<Token![;]>,
}
}
ast_struct! {
/// A function signature in a trait or implementation: `unsafe fn
/// initialize(&self)`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
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<&Receiver> {
let arg = self.inputs.first()?;
match arg {
FnArg::Receiver(receiver) => Some(receiver),
FnArg::Typed(_) => None,
}
}
}
ast_enum_of_structs! {
/// An argument in a function signature: the `n: usize` in `fn f(n: usize)`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub enum FnArg {
/// The `self` argument of an associated method.
Receiver(Receiver),
/// A function argument accepted by pattern and type.
Typed(PatType),
}
}
ast_struct! {
/// The `self` argument of an associated method.
///
/// If `colon_token` is present, the receiver is written with an explicit
/// type such as `self: Box<Self>`. If `colon_token` is absent, the receiver
/// is written in shorthand such as `self` or `&self` or `&mut self`. In the
/// shorthand case, the type in `ty` is reconstructed as one of `Self`,
/// `&Self`, or `&mut Self`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct Receiver {
pub attrs: Vec<Attribute>,
pub reference: Option<(Token![&], Option<Lifetime>)>,
pub mutability: Option<Token![mut]>,
pub self_token: Token![self],
pub colon_token: Option<Token![:]>,
pub ty: Box<Type>,
}
}
impl Receiver {
pub fn lifetime(&self) -> Option<&Lifetime> {
self.reference.as_ref()?.1.as_ref()
}
}
ast_struct! {
/// The variadic argument of a foreign function.
///
/// ```rust
/// # struct c_char;
/// # struct c_int;
/// #
/// extern "C" {
/// fn printf(format: *const c_char, ...) -> c_int;
/// // ^^^
/// }
/// ```
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
pub struct Variadic {
pub attrs: Vec<Attribute>,
pub pat: Option<(Box<Pat>, Token![:])>,
pub dots: Token![...],
pub comma: Option<Token![,]>,
}
}
ast_enum! {
/// The mutability of an `Item::Static` or `ForeignItem::Static`.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum StaticMutability {
Mut(Token![mut]),
None,
}
}
ast_enum! {
/// Unused, but reserved for RFC 3323 restrictions.
#[cfg_attr(docsrs, doc(cfg(feature = "full")))]
#[non_exhaustive]
pub enum ImplRestriction {}
//
// pub struct ImplRestriction {
// pub impl_token: Token![impl],
// pub paren_token: token::Paren,
// pub in_token: Option<Token![in]>,
// pub path: Box<Path>,
// }
}
#[cfg(feature = "parsing")]
pub(crate) mod parsing {
use crate::attr::{self, Attribute};
use crate::derive;
use crate::error::{Error, Result};
use crate::expr::Expr;
use crate::ext::IdentExt as _;
use crate::generics::{Generics, TypeParamBound};
use crate::ident::Ident;
use crate::item::{
FnArg, ForeignItem, ForeignItemFn, ForeignItemMacro, ForeignItemStatic, ForeignItemType,
ImplItem, ImplItemConst, ImplItemFn, ImplItemMacro, ImplItemType, Item, ItemConst,
ItemEnum, ItemExternCrate, ItemFn, ItemForeignMod, ItemImpl, ItemMacro, ItemMod,
ItemStatic, ItemStruct, ItemTrait, ItemTraitAlias, ItemType, ItemUnion, ItemUse, Receiver,
Signature, StaticMutability, TraitItem, TraitItemConst, TraitItemFn, TraitItemMacro,
TraitItemType, UseGlob, UseGroup, UseName, UsePath, UseRename, UseTree, Variadic,
};
use crate::lifetime::Lifetime;
use crate::lit::LitStr;
use crate::mac::{self, Macro};
use crate::parse::discouraged::Speculative as _;
use crate::parse::{Parse, ParseBuffer, ParseStream};
use crate::pat::{Pat, PatType, PatWild};
use crate::path::Path;
use crate::punctuated::Punctuated;
use crate::restriction::Visibility;
use crate::stmt::Block;
use crate::token;
use crate::ty::{Abi, ReturnType, Type, TypePath, TypeReference};
use crate::verbatim;
use proc_macro2::TokenStream;
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for Item {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
let attrs = input.call(Attribute::parse_outer)?;
parse_rest_of_item(begin, attrs, input)
}
}
pub(crate) fn parse_rest_of_item(
begin: ParseBuffer,
mut attrs: Vec<Attribute>,
input: ParseStream,
) -> Result<Item> {
let ahead = input.fork();
let vis: Visibility = ahead.parse()?;
let lookahead = ahead.lookahead1();
let mut item = if lookahead.peek(Token![fn]) || peek_signature(&ahead) {
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
if input.peek(Token![;]) {
input.parse::<Token![;]>()?;
Ok(Item::Verbatim(verbatim::between(&begin, input)))
} else {
parse_rest_of_fn(input, Vec::new(), vis, sig).map(Item::Fn)
}
} else 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::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 {
Err(lookahead.error())
}
} else {
Err(lookahead.error())
}
} else if lookahead.peek(Token![use]) {
let allow_crate_root_in_path = true;
match parse_item_use(input, allow_crate_root_in_path)? {
Some(item_use) => Ok(Item::Use(item_use)),
None => Ok(Item::Verbatim(verbatim::between(&begin, input))),
}
} else if lookahead.peek(Token![static]) {
let vis = input.parse()?;
let static_token = input.parse()?;
let mutability = input.parse()?;
let ident = input.parse()?;
if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Expr>()?;
input.parse::<Token![;]>()?;
Ok(Item::Verbatim(verbatim::between(&begin, input)))
} else {
let colon_token = input.parse()?;
let ty = input.parse()?;
if input.peek(Token![;]) {
input.parse::<Token![;]>()?;
Ok(Item::Verbatim(verbatim::between(&begin, input)))
} else {
Ok(Item::Static(ItemStatic {
attrs: Vec::new(),
vis,
static_token,
mutability,
ident,
colon_token,
ty,
eq_token: input.parse()?,
expr: input.parse()?,
semi_token: input.parse()?,
}))
}
}
} else if lookahead.peek(Token![const]) {
let vis = input.parse()?;
let const_token: Token![const] = input.parse()?;
let lookahead = input.lookahead1();
let ident = if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
};
let mut generics: Generics = input.parse()?;
let colon_token = input.parse()?;
let ty = input.parse()?;
let value = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {
let expr: Expr = input.parse()?;
Some((eq_token, expr))
} else {
None
};
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
match value {
Some((eq_token, expr))
if generics.lt_token.is_none() && generics.where_clause.is_none() =>
{
Ok(Item::Const(ItemConst {
attrs: Vec::new(),
vis,
const_token,
ident,
generics,
colon_token,
ty,
eq_token,
expr: Box::new(expr),
semi_token,
}))
}
_ => Ok(Item::Verbatim(verbatim::between(&begin, input))),
}
} 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]) {
let allow_verbatim_impl = true;
if let Some(item) = parse_impl(input, allow_verbatim_impl)? {
Ok(Item::Impl(item))
} else {
Ok(Item::Verbatim(verbatim::between(&begin, input)))
}
} else if lookahead.peek(Token![extern]) {
input.parse().map(Item::ForeignMod)
} else if lookahead.peek(Token![mod]) {
input.parse().map(Item::Mod)
} else {
Err(lookahead.error())
}
} else if lookahead.peek(Token![mod]) {
input.parse().map(Item::Mod)
} else if lookahead.peek(Token![type]) {
parse_item_type(begin, input)
} 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![!])
{
let allow_verbatim_impl = true;
if let Some(item) = parse_impl(input, allow_verbatim_impl)? {
Ok(Item::Impl(item))
} else {
Ok(Item::Verbatim(verbatim::between(&begin, input)))
}
} else if lookahead.peek(Token![macro]) {
input.advance_to(&ahead);
parse_macro2(begin, vis, input)
} else if vis.is_inherited()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| 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)
}
struct FlexibleItemType {
vis: Visibility,
defaultness: Option<Token![default]>,
type_token: Token![type],
ident: Ident,
generics: Generics,
colon_token: Option<Token![:]>,
bounds: Punctuated<TypeParamBound, Token![+]>,
ty: Option<(Token![=], Type)>,
semi_token: Token![;],
}
enum TypeDefaultness {
Optional,
Disallowed,
}
enum WhereClauseLocation {
// type Ty<T> where T: 'static = T;
BeforeEq,
// type Ty<T> = T where T: 'static;
AfterEq,
// TODO: goes away once the migration period on rust-lang/rust#89122 is over
Both,
}
impl FlexibleItemType {
fn parse(
input: ParseStream,
allow_defaultness: TypeDefaultness,
where_clause_location: WhereClauseLocation,
) -> Result<Self> {
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = match allow_defaultness {
TypeDefaultness::Optional => input.parse()?,
TypeDefaultness::Disallowed => None,
};
let type_token: Token![type] = input.parse()?;
let ident: Ident = input.parse()?;
let mut generics: Generics = input.parse()?;
let (colon_token, bounds) = Self::parse_optional_bounds(input)?;
match where_clause_location {
WhereClauseLocation::BeforeEq | WhereClauseLocation::Both => {
generics.where_clause = input.parse()?;
}
WhereClauseLocation::AfterEq => {}
}
let ty = Self::parse_optional_definition(input)?;
match where_clause_location {
WhereClauseLocation::AfterEq | WhereClauseLocation::Both
if generics.where_clause.is_none() =>
{
generics.where_clause = input.parse()?;
}
_ => {}
}
let semi_token: Token![;] = input.parse()?;
Ok(FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds,
ty,
semi_token,
})
}
fn parse_optional_bounds(
input: ParseStream,
) -> Result<(Option<Token![:]>, Punctuated<TypeParamBound, Token![+]>)> {
let colon_token: Option<Token![:]> = input.parse()?;
let mut bounds = Punctuated::new();
if colon_token.is_some() {
loop {
if input.peek(Token![where]) || input.peek(Token![=]) || input.peek(Token![;]) {
break;
}
bounds.push_value(input.parse::<TypeParamBound>()?);
if input.peek(Token![where]) || input.peek(Token![=]) || input.peek(Token![;]) {
break;
}
bounds.push_punct(input.parse::<Token![+]>()?);
}
}
Ok((colon_token, bounds))
}
fn parse_optional_definition(input: ParseStream) -> Result<Option<(Token![=], Type)>> {
let eq_token: Option<Token![=]> = input.parse()?;
if let Some(eq_token) = eq_token {
let definition: Type = input.parse()?;
Ok(Some((eq_token, definition)))
} else {
Ok(None)
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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> = if input.peek(Token![try]) {
input.call(Ident::parse_any).map(Some)
} else {
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,
})
}
}
fn parse_macro2(begin: ParseBuffer, _vis: Visibility, input: ParseStream) -> Result<Item> {
input.parse::<Token![macro]>()?;
input.parse::<Ident>()?;
let mut lookahead = input.lookahead1();
if lookahead.peek(token::Paren) {
let paren_content;
parenthesized!(paren_content in input);
paren_content.parse::<TokenStream>()?;
lookahead = input.lookahead1();
}
if lookahead.peek(token::Brace) {
let brace_content;
braced!(brace_content in input);
brace_content.parse::<TokenStream>()?;
} else {
return Err(lookahead.error());
}
Ok(Item::Verbatim(verbatim::between(&begin, input)))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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()?,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemUse {
fn parse(input: ParseStream) -> Result<Self> {
let allow_crate_root_in_path = false;
parse_item_use(input, allow_crate_root_in_path).map(Option::unwrap)
}
}
fn parse_item_use(
input: ParseStream,
allow_crate_root_in_path: bool,
) -> Result<Option<ItemUse>> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let use_token: Token![use] = input.parse()?;
let leading_colon: Option<Token![::]> = input.parse()?;
let tree = parse_use_tree(input, allow_crate_root_in_path && leading_colon.is_none())?;
let semi_token: Token![;] = input.parse()?;
let tree = match tree {
Some(tree) => tree,
None => return Ok(None),
};
Ok(Some(ItemUse {
attrs,
vis,
use_token,
leading_colon,
tree,
semi_token,
}))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for UseTree {
fn parse(input: ParseStream) -> Result<UseTree> {
let allow_crate_root_in_path = false;
parse_use_tree(input, allow_crate_root_in_path).map(Option::unwrap)
}
}
fn parse_use_tree(
input: ParseStream,
allow_crate_root_in_path: bool,
) -> Result<Option<UseTree>> {
let lookahead = input.lookahead1();
if lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
|| lookahead.peek(Token![try])
{
let ident = input.call(Ident::parse_any)?;
if input.peek(Token![::]) {
Ok(Some(UseTree::Path(UsePath {
ident,
colon2_token: input.parse()?,
tree: Box::new(input.parse()?),
})))
} else if input.peek(Token![as]) {
Ok(Some(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(Some(UseTree::Name(UseName { ident })))
}
} else if lookahead.peek(Token![*]) {
Ok(Some(UseTree::Glob(UseGlob {
star_token: input.parse()?,
})))
} else if lookahead.peek(token::Brace) {
let content;
let brace_token = braced!(content in input);
let mut items = Punctuated::new();
let mut has_any_crate_root_in_path = false;
loop {
if content.is_empty() {
break;
}
let this_tree_starts_with_crate_root =
allow_crate_root_in_path && content.parse::<Option<Token![::]>>()?.is_some();
has_any_crate_root_in_path |= this_tree_starts_with_crate_root;
match parse_use_tree(
&content,
allow_crate_root_in_path && !this_tree_starts_with_crate_root,
)? {
Some(tree) => items.push_value(tree),
None => has_any_crate_root_in_path = true,
}
if content.is_empty() {
break;
}
let comma: Token![,] = content.parse()?;
items.push_punct(comma);
}
if has_any_crate_root_in_path {
Ok(None)
} else {
Ok(Some(UseTree::Group(UseGroup { brace_token, items })))
}
} else {
Err(lookahead.error())
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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()?,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemConst {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let const_token: Token![const] = input.parse()?;
let lookahead = input.lookahead1();
let ident = if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
};
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let expr: Expr = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ItemConst {
attrs,
vis,
const_token,
ident,
generics: Generics::default(),
colon_token,
ty: Box::new(ty),
eq_token,
expr: Box::new(expr),
semi_token,
})
}
}
fn peek_signature(input: ParseStream) -> bool {
let fork = input.fork();
fork.parse::<Option<Token![const]>>().is_ok()
&& fork.parse::<Option<Token![async]>>().is_ok()
&& fork.parse::<Option<Token![unsafe]>>().is_ok()
&& fork.parse::<Option<Abi>>().is_ok()
&& fork.peek(Token![fn])
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for Signature {
fn parse(input: ParseStream) -> Result<Self> {
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 mut generics: Generics = input.parse()?;
let content;
let paren_token = parenthesized!(content in input);
let (inputs, variadic) = parse_fn_args(&content)?;
let output: ReturnType = input.parse()?;
generics.where_clause = input.parse()?;
Ok(Signature {
constness,
asyncness,
unsafety,
abi,
fn_token,
ident,
generics,
paren_token,
inputs,
variadic,
output,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemFn {
fn parse(input: ParseStream) -> Result<Self> {
let outer_attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
parse_rest_of_fn(input, outer_attrs, vis, sig)
}
}
fn parse_rest_of_fn(
input: ParseStream,
mut attrs: Vec<Attribute>,
vis: Visibility,
sig: Signature,
) -> Result<ItemFn> {
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
Ok(ItemFn {
attrs,
vis,
sig,
block: Box::new(Block { brace_token, stmts }),
})
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for FnArg {
fn parse(input: ParseStream) -> Result<Self> {
let allow_variadic = false;
let attrs = input.call(Attribute::parse_outer)?;
match parse_fn_arg_or_variadic(input, attrs, allow_variadic)? {
FnArgOrVariadic::FnArg(arg) => Ok(arg),
FnArgOrVariadic::Variadic(_) => unreachable!(),
}
}
}
enum FnArgOrVariadic {
FnArg(FnArg),
Variadic(Variadic),
}
fn parse_fn_arg_or_variadic(
input: ParseStream,
attrs: Vec<Attribute>,
allow_variadic: bool,
) -> Result<FnArgOrVariadic> {
let ahead = input.fork();
if let Ok(mut receiver) = ahead.parse::<Receiver>() {
input.advance_to(&ahead);
receiver.attrs = attrs;
return Ok(FnArgOrVariadic::FnArg(FnArg::Receiver(receiver)));
}
// 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(FnArgOrVariadic::FnArg(FnArg::Typed(PatType {
attrs,
pat: Box::new(Pat::Wild(PatWild {
attrs: Vec::new(),
underscore_token: Token,
})),
colon_token: Token,
ty: input.parse()?,
})));
}
let pat = Box::new(Pat::parse_single(input)?);
let colon_token: Token![:] = input.parse()?;
if allow_variadic {
if let Some(dots) = input.parse::<Option<Token![...]>>()? {
return Ok(FnArgOrVariadic::Variadic(Variadic {
attrs,
pat: Some((pat, colon_token)),
dots,
comma: None,
}));
}
}
Ok(FnArgOrVariadic::FnArg(FnArg::Typed(PatType {
attrs,
pat,
colon_token,
ty: input.parse()?,
})))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for Receiver {
fn parse(input: ParseStream) -> Result<Self> {
let reference = if input.peek(Token![&]) {
let ampersand: Token![&] = input.parse()?;
let lifetime: Option<Lifetime> = input.parse()?;
Some((ampersand, lifetime))
} else {
None
};
let mutability: Option<Token![mut]> = input.parse()?;
let self_token: Token![self] = input.parse()?;
let colon_token: Option<Token![:]> = if reference.is_some() {
None
} else {
input.parse()?
};
let ty: Type = if colon_token.is_some() {
input.parse()?
} else {
let mut ty = Type::Path(TypePath {
qself: None,
path: Path::from(Ident::new("Self", self_token.span)),
});
if let Some((ampersand, lifetime)) = reference.as_ref() {
ty = Type::Reference(TypeReference {
and_token: Token,
lifetime: lifetime.clone(),
mutability: mutability.as_ref().map(|m| Token),
elem: Box::new(ty),
});
}
ty
};
Ok(Receiver {
attrs: Vec::new(),
reference,
mutability,
self_token,
colon_token,
ty: Box::new(ty),
})
}
}
fn parse_fn_args(
input: ParseStream,
) -> Result<(Punctuated<FnArg, Token![,]>, Option<Variadic>)> {
let mut args = Punctuated::new();
let mut variadic = None;
let mut has_receiver = false;
while !input.is_empty() {
let attrs = input.call(Attribute::parse_outer)?;
if let Some(dots) = input.parse::<Option<Token![...]>>()? {
variadic = Some(Variadic {
attrs,
pat: None,
dots,
comma: if input.is_empty() {
None
} else {
Some(input.parse()?)
},
});
break;
}
let allow_variadic = true;
let arg = match parse_fn_arg_or_variadic(input, attrs, allow_variadic)? {
FnArgOrVariadic::FnArg(arg) => arg,
FnArgOrVariadic::Variadic(arg) => {
variadic = Some(Variadic {
comma: if input.is_empty() {
None
} else {
Some(input.parse()?)
},
..arg
});
break;
}
};
match &arg {
FnArg::Receiver(receiver) if has_receiver => {
return Err(Error::new(
receiver.self_token.span,
"unexpected second method receiver",
));
}
FnArg::Receiver(receiver) if !args.is_empty() => {
return Err(Error::new(
receiver.self_token.span,
"unexpected method receiver",
));
}
FnArg::Receiver(_) => has_receiver = true,
FnArg::Typed(_) => {}
}
args.push_value(arg);
if input.is_empty() {
break;
}
let comma: Token![,] = input.parse()?;
args.push_punct(comma);
}
Ok((args, variadic))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemMod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let unsafety: Option<Token![unsafe]> = input.parse()?;
let mod_token: Token![mod] = input.parse()?;
let ident: Ident = if input.peek(Token![try]) {
input.call(Ident::parse_any)
} else {
input.parse()
}?;
let lookahead = input.lookahead1();
if lookahead.peek(Token![;]) {
Ok(ItemMod {
attrs,
vis,
unsafety,
mod_token,
ident,
content: None,
semi: Some(input.parse()?),
})
} else if lookahead.peek(token::Brace) {
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemMod {
attrs,
vis,
unsafety,
mod_token,
ident,
content: Some((brace_token, items)),
semi: None,
})
} else {
Err(lookahead.error())
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemForeignMod {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let unsafety: Option<Token![unsafe]> = input.parse()?;
let abi: Abi = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemForeignMod {
attrs,
unsafety,
abi,
brace_token,
items,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
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]) || peek_signature(&ahead) {
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
if input.peek(token::Brace) {
let content;
braced!(content in input);
content.call(Attribute::parse_inner)?;
content.call(Block::parse_within)?;
Ok(ForeignItem::Verbatim(verbatim::between(&begin, input)))
} else {
Ok(ForeignItem::Fn(ForeignItemFn {
attrs: Vec::new(),
vis,
sig,
semi_token: input.parse()?,
}))
}
} else if lookahead.peek(Token![static]) {
let vis = input.parse()?;
let static_token = input.parse()?;
let mutability = input.parse()?;
let ident = input.parse()?;
let colon_token = input.parse()?;
let ty = input.parse()?;
if input.peek(Token![=]) {
input.parse::<Token![=]>()?;
input.parse::<Expr>()?;
input.parse::<Token![;]>()?;
Ok(ForeignItem::Verbatim(verbatim::between(&begin, input)))
} else {
Ok(ForeignItem::Static(ForeignItemStatic {
attrs: Vec::new(),
vis,
static_token,
mutability,
ident,
colon_token,
ty,
semi_token: input.parse()?,
}))
}
} else if lookahead.peek(Token![type]) {
parse_foreign_item_type(begin, input)
} else if vis.is_inherited()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| 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(_) => return Ok(item),
};
attrs.append(item_attrs);
*item_attrs = attrs;
Ok(item)
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ForeignItemFn {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let sig: Signature = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ForeignItemFn {
attrs,
vis,
sig,
semi_token,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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()?,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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()?,
generics: {
let mut generics: Generics = input.parse()?;
generics.where_clause = input.parse()?;
generics
},
semi_token: input.parse()?,
})
}
}
fn parse_foreign_item_type(begin: ParseBuffer, input: ParseStream) -> Result<ForeignItem> {
let FlexibleItemType {
vis,
defaultness: _,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(
input,
TypeDefaultness::Disallowed,
WhereClauseLocation::Both,
)?;
if colon_token.is_some() || ty.is_some() {
Ok(ForeignItem::Verbatim(verbatim::between(&begin, input)))
} else {
Ok(ForeignItem::Type(ForeignItemType {
attrs: Vec::new(),
vis,
type_token,
ident,
generics,
semi_token,
}))
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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()?,
})
}
}
fn parse_item_type(begin: ParseBuffer, input: ParseStream) -> Result<Item> {
let FlexibleItemType {
vis,
defaultness: _,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(
input,
TypeDefaultness::Disallowed,
WhereClauseLocation::BeforeEq,
)?;
let (eq_token, ty) = match ty {
Some(ty) if colon_token.is_none() => ty,
_ => return Ok(Item::Verbatim(verbatim::between(&begin, input))),
};
Ok(Item::Type(ItemType {
attrs: Vec::new(),
vis,
type_token,
ident,
generics,
eq_token,
ty: Box::new(ty),
semi_token,
}))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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())
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemTrait {
fn parse(input: ParseStream) -> Result<Self> {
let outer_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,
outer_attrs,
vis,
unsafety,
auto_token,
trait_token,
ident,
generics,
)
}
}
fn parse_rest_of_trait(
input: ParseStream,
mut 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 {
if input.peek(Token![where]) || input.peek(token::Brace) {
break;
}
supertraits.push_value(input.parse()?);
if input.peek(Token![where]) || input.peek(token::Brace) {
break;
}
supertraits.push_punct(input.parse()?);
}
}
generics.where_clause = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
Ok(ItemTrait {
attrs,
vis,
unsafety,
auto_token,
restriction: None,
trait_token,
ident,
generics,
colon_token,
supertraits,
brace_token,
items,
})
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
})
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for TraitItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let ahead = input.fork();
let lookahead = ahead.lookahead1();
let mut item = if lookahead.peek(Token![fn]) || peek_signature(&ahead) {
input.parse().map(TraitItem::Fn)
} else if lookahead.peek(Token![const]) {
let const_token: Token![const] = ahead.parse()?;
let lookahead = ahead.lookahead1();
if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.advance_to(&ahead);
let ident = input.call(Ident::parse_any)?;
let mut generics: Generics = input.parse()?;
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
let default = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {
let expr: Expr = input.parse()?;
Some((eq_token, expr))
} else {
None
};
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
if generics.lt_token.is_none() && generics.where_clause.is_none() {
Ok(TraitItem::Const(TraitItemConst {
attrs: Vec::new(),
const_token,
ident,
generics,
colon_token,
ty,
default,
semi_token,
}))
} else {
return Ok(TraitItem::Verbatim(verbatim::between(&begin, input)));
}
} else if lookahead.peek(Token![async])
|| lookahead.peek(Token![unsafe])
|| lookahead.peek(Token![extern])
|| lookahead.peek(Token![fn])
{
input.parse().map(TraitItem::Fn)
} else {
Err(lookahead.error())
}
} else if lookahead.peek(Token![type]) {
parse_trait_item_type(begin.fork(), input)
} else if vis.is_inherited()
&& defaultness.is_none()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| lookahead.peek(Token![crate])
|| lookahead.peek(Token![::]))
{
input.parse().map(TraitItem::Macro)
} else {
Err(lookahead.error())
}?;
match (vis, defaultness) {
(Visibility::Inherited, None) => {}
_ => return Ok(TraitItem::Verbatim(verbatim::between(&begin, input))),
}
let item_attrs = match &mut item {
TraitItem::Const(item) => &mut item.attrs,
TraitItem::Fn(item) => &mut item.attrs,
TraitItem::Type(item) => &mut item.attrs,
TraitItem::Macro(item) => &mut item.attrs,
TraitItem::Verbatim(_) => unreachable!(),
};
attrs.append(item_attrs);
*item_attrs = attrs;
Ok(item)
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemConst {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let const_token: Token![const] = input.parse()?;
let lookahead = input.lookahead1();
let ident = if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
};
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
let default = if input.peek(Token![=]) {
let eq_token: Token![=] = input.parse()?;
let default: Expr = input.parse()?;
Some((eq_token, default))
} else {
None
};
let semi_token: Token![;] = input.parse()?;
Ok(TraitItemConst {
attrs,
const_token,
ident,
generics: Generics::default(),
colon_token,
ty,
default,
semi_token,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for TraitItemFn {
fn parse(input: ParseStream) -> Result<Self> {
let mut attrs = input.call(Attribute::parse_outer)?;
let sig: Signature = input.parse()?;
let lookahead = input.lookahead1();
let (brace_token, stmts, semi_token) = if lookahead.peek(token::Brace) {
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let stmts = content.call(Block::parse_within)?;
(Some(brace_token), stmts, None)
} else if lookahead.peek(Token![;]) {
let semi_token: Token![;] = input.parse()?;
(None, Vec::new(), Some(semi_token))
} else {
return Err(lookahead.error());
};
Ok(TraitItemFn {
attrs,
sig,
default: brace_token.map(|brace_token| Block { brace_token, stmts }),
semi_token,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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, bounds) = FlexibleItemType::parse_optional_bounds(input)?;
let default = FlexibleItemType::parse_optional_definition(input)?;
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(TraitItemType {
attrs,
type_token,
ident,
generics,
colon_token,
bounds,
default,
semi_token,
})
}
}
fn parse_trait_item_type(begin: ParseBuffer, input: ParseStream) -> Result<TraitItem> {
let FlexibleItemType {
vis,
defaultness: _,
type_token,
ident,
generics,
colon_token,
bounds,
ty,
semi_token,
} = FlexibleItemType::parse(
input,
TypeDefaultness::Disallowed,
WhereClauseLocation::AfterEq,
)?;
if vis.is_some() {
Ok(TraitItem::Verbatim(verbatim::between(&begin, input)))
} else {
Ok(TraitItem::Type(TraitItemType {
attrs: Vec::new(),
type_token,
ident,
generics,
colon_token,
bounds,
default: ty,
semi_token,
}))
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ItemImpl {
fn parse(input: ParseStream) -> Result<Self> {
let allow_verbatim_impl = false;
parse_impl(input, allow_verbatim_impl).map(Option::unwrap)
}
}
fn parse_impl(input: ParseStream, allow_verbatim_impl: bool) -> Result<Option<ItemImpl>> {
let mut attrs = input.call(Attribute::parse_outer)?;
let has_visibility = allow_verbatim_impl && input.parse::<Visibility>()?.is_some();
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![>])
|| input.peek3(Token![=]))
|| input.peek2(Token![const]));
let mut generics: Generics = if has_generics {
input.parse()?
} else {
Generics::default()
};
let is_const_impl = allow_verbatim_impl
&& (input.peek(Token![const]) || input.peek(Token![?]) && input.peek2(Token![const]));
if is_const_impl {
input.parse::<Option<Token![?]>>()?;
input.parse::<Token![const]>()?;
}
let begin = input.fork();
let polarity = if input.peek(Token![!]) && !input.peek2(token::Brace) {
Some(input.parse::<Token![!]>()?)
} else {
None
};
#[cfg(not(feature = "printing"))]
let first_ty_span = input.span();
let mut first_ty: Type = input.parse()?;
let self_ty: Type;
let trait_;
let is_impl_for = input.peek(Token![for]);
if is_impl_for {
let for_token: Token![for] = input.parse()?;
let mut first_ty_ref = &first_ty;
while let Type::Group(ty) = first_ty_ref {
first_ty_ref = &ty.elem;
}
if let Type::Path(TypePath { qself: None, .. }) = first_ty_ref {
while let Type::Group(ty) = first_ty {
first_ty = *ty.elem;
}
if let Type::Path(TypePath { qself: None, path }) = first_ty {
trait_ = Some((polarity, path, for_token));
} else {
unreachable!();
}
} else if !allow_verbatim_impl {
#[cfg(feature = "printing")]
return Err(Error::new_spanned(first_ty_ref, "expected trait path"));
#[cfg(not(feature = "printing"))]
return Err(Error::new(first_ty_span, "expected trait path"));
} else {
trait_ = None;
}
self_ty = input.parse()?;
} else {
trait_ = None;
self_ty = if polarity.is_none() {
first_ty
} else {
Type::Verbatim(verbatim::between(&begin, input))
};
}
generics.where_clause = input.parse()?;
let content;
let brace_token = braced!(content in input);
attr::parsing::parse_inner(&content, &mut attrs)?;
let mut items = Vec::new();
while !content.is_empty() {
items.push(content.parse()?);
}
if has_visibility || is_const_impl || is_impl_for && trait_.is_none() {
Ok(None)
} else {
Ok(Some(ItemImpl {
attrs,
defaultness,
unsafety,
impl_token,
generics,
trait_,
self_ty: Box::new(self_ty),
brace_token,
items,
}))
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ImplItem {
fn parse(input: ParseStream) -> Result<Self> {
let begin = input.fork();
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![fn]) || peek_signature(&ahead) {
let allow_omitted_body = true;
if let Some(item) = parse_impl_item_fn(input, allow_omitted_body)? {
Ok(ImplItem::Fn(item))
} else {
Ok(ImplItem::Verbatim(verbatim::between(&begin, input)))
}
} else if lookahead.peek(Token![const]) {
input.advance_to(&ahead);
let const_token: Token![const] = input.parse()?;
let lookahead = input.lookahead1();
let ident = if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
};
let mut generics: Generics = input.parse()?;
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
let value = if let Some(eq_token) = input.parse::<Option<Token![=]>>()? {
let expr: Expr = input.parse()?;
Some((eq_token, expr))
} else {
None
};
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
return match value {
Some((eq_token, expr))
if generics.lt_token.is_none() && generics.where_clause.is_none() =>
{
Ok(ImplItem::Const(ImplItemConst {
attrs,
vis,
defaultness,
const_token,
ident,
generics,
colon_token,
ty,
eq_token,
expr,
semi_token,
}))
}
_ => Ok(ImplItem::Verbatim(verbatim::between(&begin, input))),
};
} else if lookahead.peek(Token![type]) {
parse_impl_item_type(begin, input)
} else if vis.is_inherited()
&& defaultness.is_none()
&& (lookahead.peek(Ident)
|| lookahead.peek(Token![self])
|| lookahead.peek(Token![super])
|| 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::Fn(item) => &mut item.attrs,
ImplItem::Type(item) => &mut item.attrs,
ImplItem::Macro(item) => &mut item.attrs,
ImplItem::Verbatim(_) => return Ok(item),
};
attrs.append(item_attrs);
*item_attrs = attrs;
}
Ok(item)
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemConst {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let const_token: Token![const] = input.parse()?;
let lookahead = input.lookahead1();
let ident = if lookahead.peek(Ident) || lookahead.peek(Token![_]) {
input.call(Ident::parse_any)?
} else {
return Err(lookahead.error());
};
let colon_token: Token![:] = input.parse()?;
let ty: Type = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let expr: Expr = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ImplItemConst {
attrs,
vis,
defaultness,
const_token,
ident,
generics: Generics::default(),
colon_token,
ty,
eq_token,
expr,
semi_token,
})
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemFn {
fn parse(input: ParseStream) -> Result<Self> {
let allow_omitted_body = false;
parse_impl_item_fn(input, allow_omitted_body).map(Option::unwrap)
}
}
fn parse_impl_item_fn(
input: ParseStream,
allow_omitted_body: bool,
) -> Result<Option<ImplItemFn>> {
let mut attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let sig: Signature = input.parse()?;
// Accept functions 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.
if allow_omitted_body && input.parse::<Option<Token![;]>>()?.is_some() {
return Ok(None);
}
let content;
let brace_token = braced!(content in input);
attrs.extend(content.call(Attribute::parse_inner)?);
let block = Block {
brace_token,
stmts: content.call(Block::parse_within)?,
};
Ok(Some(ImplItemFn {
attrs,
vis,
defaultness,
sig,
block,
}))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for ImplItemType {
fn parse(input: ParseStream) -> Result<Self> {
let attrs = input.call(Attribute::parse_outer)?;
let vis: Visibility = input.parse()?;
let defaultness: Option<Token![default]> = input.parse()?;
let type_token: Token![type] = input.parse()?;
let ident: Ident = input.parse()?;
let mut generics: Generics = input.parse()?;
let eq_token: Token![=] = input.parse()?;
let ty: Type = input.parse()?;
generics.where_clause = input.parse()?;
let semi_token: Token![;] = input.parse()?;
Ok(ImplItemType {
attrs,
vis,
defaultness,
type_token,
ident,
generics,
eq_token,
ty,
semi_token,
})
}
}
fn parse_impl_item_type(begin: ParseBuffer, input: ParseStream) -> Result<ImplItem> {
let FlexibleItemType {
vis,
defaultness,
type_token,
ident,
generics,
colon_token,
bounds: _,
ty,
semi_token,
} = FlexibleItemType::parse(
input,
TypeDefaultness::Optional,
WhereClauseLocation::AfterEq,
)?;
let (eq_token, ty) = match ty {
Some(ty) if colon_token.is_none() => ty,
_ => return Ok(ImplItem::Verbatim(verbatim::between(&begin, input))),
};
Ok(ImplItem::Type(ImplItemType {
attrs: Vec::new(),
vis,
defaultness,
type_token,
ident,
generics,
eq_token,
ty,
semi_token,
}))
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
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,
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "parsing")))]
impl Parse for StaticMutability {
fn parse(input: ParseStream) -> Result<Self> {
let mut_token: Option<Token![mut]> = input.parse()?;
Ok(mut_token.map_or(StaticMutability::None, StaticMutability::Mut))
}
}
}
#[cfg(feature = "printing")]
mod printing {
use crate::attr::FilterAttrs;
use crate::data::Fields;
use crate::item::{
ForeignItemFn, ForeignItemMacro, ForeignItemStatic, ForeignItemType, ImplItemConst,
ImplItemFn, ImplItemMacro, ImplItemType, ItemConst, ItemEnum, ItemExternCrate, ItemFn,
ItemForeignMod, ItemImpl, ItemMacro, ItemMod, ItemStatic, ItemStruct, ItemTrait,
ItemTraitAlias, ItemType, ItemUnion, ItemUse, Receiver, Signature, StaticMutability,
TraitItemConst, TraitItemFn, TraitItemMacro, TraitItemType, UseGlob, UseGroup, UseName,
UsePath, UseRename, Variadic,
};
use crate::mac::MacroDelimiter;
use crate::print::TokensOrDefault;
use crate::ty::Type;
use proc_macro2::TokenStream;
use quote::{ToTokens, TokenStreamExt};
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for ItemMod {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.vis.to_tokens(tokens);
self.unsafety.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);
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for ItemForeignMod {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
self.unsafety.to_tokens(tokens);
self.abi.to_tokens(tokens);
self.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.items);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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.attrs.inner());
tokens.append_all(&self.items);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for UseName {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.ident.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for UseGlob {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.star_token.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for UseGroup {
fn to_tokens(&self, tokens: &mut TokenStream) {
self.brace_token.surround(tokens, |tokens| {
self.items.to_tokens(tokens);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for TraitItemFn {
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);
}
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
if let Some((eq_token, default)) = &self.default {
eq_token.to_tokens(tokens);
default.to_tokens(tokens);
}
self.generics.where_clause.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for ImplItemFn {
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);
self.block.brace_token.surround(tokens, |tokens| {
tokens.append_all(self.attrs.inner());
tokens.append_all(&self.block.stmts);
});
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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.eq_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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.generics.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
self.semi_token.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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 let Some(variadic) = &self.variadic {
if !self.inputs.empty_or_trailing() {
<Token![,]>::default().to_tokens(tokens);
}
variadic.to_tokens(tokens);
}
});
self.output.to_tokens(tokens);
self.generics.where_clause.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
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);
if let Some(colon_token) = &self.colon_token {
colon_token.to_tokens(tokens);
self.ty.to_tokens(tokens);
} else {
let consistent = match (&self.reference, &self.mutability, &*self.ty) {
(Some(_), mutability, Type::Reference(ty)) => {
mutability.is_some() == ty.mutability.is_some()
&& match &*ty.elem {
Type::Path(ty) => ty.qself.is_none() && ty.path.is_ident("Self"),
_ => false,
}
}
(None, _, Type::Path(ty)) => ty.qself.is_none() && ty.path.is_ident("Self"),
_ => false,
};
if !consistent {
<Token![:]>::default().to_tokens(tokens);
self.ty.to_tokens(tokens);
}
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for Variadic {
fn to_tokens(&self, tokens: &mut TokenStream) {
tokens.append_all(self.attrs.outer());
if let Some((pat, colon)) = &self.pat {
pat.to_tokens(tokens);
colon.to_tokens(tokens);
}
self.dots.to_tokens(tokens);
self.comma.to_tokens(tokens);
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "printing")))]
impl ToTokens for StaticMutability {
fn to_tokens(&self, tokens: &mut TokenStream) {
match self {
StaticMutability::None => {}
StaticMutability::Mut(mut_token) => mut_token.to_tokens(tokens),
}
}
}
}