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-rw-r--r--vendor/syn/src/ty.rs1189
1 files changed, 1189 insertions, 0 deletions
diff --git a/vendor/syn/src/ty.rs b/vendor/syn/src/ty.rs
new file mode 100644
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--- /dev/null
+++ b/vendor/syn/src/ty.rs
@@ -0,0 +1,1189 @@
+use super::*;
+use crate::punctuated::Punctuated;
+use proc_macro2::TokenStream;
+
+ast_enum_of_structs! {
+ /// The possible types that a Rust value could have.
+ ///
+ /// # Syntax tree enum
+ ///
+ /// This type is a [syntax tree enum].
+ ///
+ /// [syntax tree enum]: Expr#syntax-tree-enums
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ #[non_exhaustive]
+ pub enum Type {
+ /// A fixed size array type: `[T; n]`.
+ Array(TypeArray),
+
+ /// A bare function type: `fn(usize) -> bool`.
+ BareFn(TypeBareFn),
+
+ /// A type contained within invisible delimiters.
+ Group(TypeGroup),
+
+ /// An `impl Bound1 + Bound2 + Bound3` type where `Bound` is a trait or
+ /// a lifetime.
+ ImplTrait(TypeImplTrait),
+
+ /// Indication that a type should be inferred by the compiler: `_`.
+ Infer(TypeInfer),
+
+ /// A macro in the type position.
+ Macro(TypeMacro),
+
+ /// The never type: `!`.
+ Never(TypeNever),
+
+ /// A parenthesized type equivalent to the inner type.
+ Paren(TypeParen),
+
+ /// A path like `std::slice::Iter`, optionally qualified with a
+ /// self-type as in `<Vec<T> as SomeTrait>::Associated`.
+ Path(TypePath),
+
+ /// A raw pointer type: `*const T` or `*mut T`.
+ Ptr(TypePtr),
+
+ /// A reference type: `&'a T` or `&'a mut T`.
+ Reference(TypeReference),
+
+ /// A dynamically sized slice type: `[T]`.
+ Slice(TypeSlice),
+
+ /// A trait object type `dyn Bound1 + Bound2 + Bound3` where `Bound` is a
+ /// trait or a lifetime.
+ TraitObject(TypeTraitObject),
+
+ /// A tuple type: `(A, B, C, String)`.
+ Tuple(TypeTuple),
+
+ /// Tokens in type position not interpreted by Syn.
+ Verbatim(TokenStream),
+
+ // For testing exhaustiveness in downstream code, use the following idiom:
+ //
+ // match ty {
+ // #![cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
+ //
+ // Type::Array(ty) => {...}
+ // Type::BareFn(ty) => {...}
+ // ...
+ // Type::Verbatim(ty) => {...}
+ //
+ // _ => { /* 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 fixed size array type: `[T; n]`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeArray {
+ pub bracket_token: token::Bracket,
+ pub elem: Box<Type>,
+ pub semi_token: Token![;],
+ pub len: Expr,
+ }
+}
+
+ast_struct! {
+ /// A bare function type: `fn(usize) -> bool`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeBareFn {
+ pub lifetimes: Option<BoundLifetimes>,
+ pub unsafety: Option<Token![unsafe]>,
+ pub abi: Option<Abi>,
+ pub fn_token: Token![fn],
+ pub paren_token: token::Paren,
+ pub inputs: Punctuated<BareFnArg, Token![,]>,
+ pub variadic: Option<BareVariadic>,
+ pub output: ReturnType,
+ }
+}
+
+ast_struct! {
+ /// A type contained within invisible delimiters.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeGroup {
+ pub group_token: token::Group,
+ pub elem: Box<Type>,
+ }
+}
+
+ast_struct! {
+ /// An `impl Bound1 + Bound2 + Bound3` type where `Bound` is a trait or
+ /// a lifetime.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeImplTrait {
+ pub impl_token: Token![impl],
+ pub bounds: Punctuated<TypeParamBound, Token![+]>,
+ }
+}
+
+ast_struct! {
+ /// Indication that a type should be inferred by the compiler: `_`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeInfer {
+ pub underscore_token: Token![_],
+ }
+}
+
+ast_struct! {
+ /// A macro in the type position.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeMacro {
+ pub mac: Macro,
+ }
+}
+
+ast_struct! {
+ /// The never type: `!`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeNever {
+ pub bang_token: Token![!],
+ }
+}
+
+ast_struct! {
+ /// A parenthesized type equivalent to the inner type.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeParen {
+ pub paren_token: token::Paren,
+ pub elem: Box<Type>,
+ }
+}
+
+ast_struct! {
+ /// A path like `std::slice::Iter`, optionally qualified with a
+ /// self-type as in `<Vec<T> as SomeTrait>::Associated`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypePath {
+ pub qself: Option<QSelf>,
+ pub path: Path,
+ }
+}
+
+ast_struct! {
+ /// A raw pointer type: `*const T` or `*mut T`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypePtr {
+ pub star_token: Token![*],
+ pub const_token: Option<Token![const]>,
+ pub mutability: Option<Token![mut]>,
+ pub elem: Box<Type>,
+ }
+}
+
+ast_struct! {
+ /// A reference type: `&'a T` or `&'a mut T`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeReference {
+ pub and_token: Token![&],
+ pub lifetime: Option<Lifetime>,
+ pub mutability: Option<Token![mut]>,
+ pub elem: Box<Type>,
+ }
+}
+
+ast_struct! {
+ /// A dynamically sized slice type: `[T]`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeSlice {
+ pub bracket_token: token::Bracket,
+ pub elem: Box<Type>,
+ }
+}
+
+ast_struct! {
+ /// A trait object type `dyn Bound1 + Bound2 + Bound3` where `Bound` is a
+ /// trait or a lifetime.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeTraitObject {
+ pub dyn_token: Option<Token![dyn]>,
+ pub bounds: Punctuated<TypeParamBound, Token![+]>,
+ }
+}
+
+ast_struct! {
+ /// A tuple type: `(A, B, C, String)`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct TypeTuple {
+ pub paren_token: token::Paren,
+ pub elems: Punctuated<Type, Token![,]>,
+ }
+}
+
+ast_struct! {
+ /// The binary interface of a function: `extern "C"`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct Abi {
+ pub extern_token: Token![extern],
+ pub name: Option<LitStr>,
+ }
+}
+
+ast_struct! {
+ /// An argument in a function type: the `usize` in `fn(usize) -> bool`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct BareFnArg {
+ pub attrs: Vec<Attribute>,
+ pub name: Option<(Ident, Token![:])>,
+ pub ty: Type,
+ }
+}
+
+ast_struct! {
+ /// The variadic argument of a function pointer like `fn(usize, ...)`.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub struct BareVariadic {
+ pub attrs: Vec<Attribute>,
+ pub name: Option<(Ident, Token![:])>,
+ pub dots: Token![...],
+ pub comma: Option<Token![,]>,
+ }
+}
+
+ast_enum! {
+ /// Return type of a function signature.
+ #[cfg_attr(doc_cfg, doc(cfg(any(feature = "full", feature = "derive"))))]
+ pub enum ReturnType {
+ /// Return type is not specified.
+ ///
+ /// Functions default to `()` and closures default to type inference.
+ Default,
+ /// A particular type is returned.
+ Type(Token![->], Box<Type>),
+ }
+}
+
+#[cfg(feature = "parsing")]
+pub(crate) mod parsing {
+ use super::*;
+ use crate::ext::IdentExt as _;
+ use crate::parse::{Parse, ParseStream, Result};
+ use crate::path;
+ use proc_macro2::Span;
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for Type {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_plus = true;
+ let allow_group_generic = true;
+ ambig_ty(input, allow_plus, allow_group_generic)
+ }
+ }
+
+ impl Type {
+ /// In some positions, types may not contain the `+` character, to
+ /// disambiguate them. For example in the expression `1 as T`, T may not
+ /// contain a `+` character.
+ ///
+ /// This parser does not allow a `+`, while the default parser does.
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ pub fn without_plus(input: ParseStream) -> Result<Self> {
+ let allow_plus = false;
+ let allow_group_generic = true;
+ ambig_ty(input, allow_plus, allow_group_generic)
+ }
+ }
+
+ pub(crate) fn ambig_ty(
+ input: ParseStream,
+ allow_plus: bool,
+ allow_group_generic: bool,
+ ) -> Result<Type> {
+ let begin = input.fork();
+
+ if input.peek(token::Group) {
+ let mut group: TypeGroup = input.parse()?;
+ if input.peek(Token![::]) && input.peek3(Ident::peek_any) {
+ if let Type::Path(mut ty) = *group.elem {
+ Path::parse_rest(input, &mut ty.path, false)?;
+ return Ok(Type::Path(ty));
+ } else {
+ return Ok(Type::Path(TypePath {
+ qself: Some(QSelf {
+ lt_token: Token![<](group.group_token.span),
+ position: 0,
+ as_token: None,
+ gt_token: Token![>](group.group_token.span),
+ ty: group.elem,
+ }),
+ path: Path::parse_helper(input, false)?,
+ }));
+ }
+ } else if input.peek(Token![<]) && allow_group_generic
+ || input.peek(Token![::]) && input.peek3(Token![<])
+ {
+ if let Type::Path(mut ty) = *group.elem {
+ let arguments = &mut ty.path.segments.last_mut().unwrap().arguments;
+ if arguments.is_none() {
+ *arguments = PathArguments::AngleBracketed(input.parse()?);
+ Path::parse_rest(input, &mut ty.path, false)?;
+ return Ok(Type::Path(ty));
+ } else {
+ group.elem = Box::new(Type::Path(ty));
+ }
+ }
+ }
+ return Ok(Type::Group(group));
+ }
+
+ let mut lifetimes = None::<BoundLifetimes>;
+ let mut lookahead = input.lookahead1();
+ if lookahead.peek(Token![for]) {
+ lifetimes = input.parse()?;
+ lookahead = input.lookahead1();
+ if !lookahead.peek(Ident)
+ && !lookahead.peek(Token![fn])
+ && !lookahead.peek(Token![unsafe])
+ && !lookahead.peek(Token![extern])
+ && !lookahead.peek(Token![super])
+ && !lookahead.peek(Token![self])
+ && !lookahead.peek(Token![Self])
+ && !lookahead.peek(Token![crate])
+ || input.peek(Token![dyn])
+ {
+ return Err(lookahead.error());
+ }
+ }
+
+ if lookahead.peek(token::Paren) {
+ let content;
+ let paren_token = parenthesized!(content in input);
+ if content.is_empty() {
+ return Ok(Type::Tuple(TypeTuple {
+ paren_token,
+ elems: Punctuated::new(),
+ }));
+ }
+ if content.peek(Lifetime) {
+ return Ok(Type::Paren(TypeParen {
+ paren_token,
+ elem: Box::new(Type::TraitObject(content.parse()?)),
+ }));
+ }
+ if content.peek(Token![?]) {
+ return Ok(Type::TraitObject(TypeTraitObject {
+ dyn_token: None,
+ bounds: {
+ let mut bounds = Punctuated::new();
+ bounds.push_value(TypeParamBound::Trait(TraitBound {
+ paren_token: Some(paren_token),
+ ..content.parse()?
+ }));
+ while let Some(plus) = input.parse()? {
+ bounds.push_punct(plus);
+ bounds.push_value(input.parse()?);
+ }
+ bounds
+ },
+ }));
+ }
+ let mut first: Type = content.parse()?;
+ if content.peek(Token![,]) {
+ return Ok(Type::Tuple(TypeTuple {
+ paren_token,
+ elems: {
+ let mut elems = Punctuated::new();
+ elems.push_value(first);
+ elems.push_punct(content.parse()?);
+ while !content.is_empty() {
+ elems.push_value(content.parse()?);
+ if content.is_empty() {
+ break;
+ }
+ elems.push_punct(content.parse()?);
+ }
+ elems
+ },
+ }));
+ }
+ if allow_plus && input.peek(Token![+]) {
+ loop {
+ let first = match first {
+ Type::Path(TypePath { qself: None, path }) => {
+ TypeParamBound::Trait(TraitBound {
+ paren_token: Some(paren_token),
+ modifier: TraitBoundModifier::None,
+ lifetimes: None,
+ path,
+ })
+ }
+ Type::TraitObject(TypeTraitObject {
+ dyn_token: None,
+ bounds,
+ }) => {
+ if bounds.len() > 1 || bounds.trailing_punct() {
+ first = Type::TraitObject(TypeTraitObject {
+ dyn_token: None,
+ bounds,
+ });
+ break;
+ }
+ match bounds.into_iter().next().unwrap() {
+ TypeParamBound::Trait(trait_bound) => {
+ TypeParamBound::Trait(TraitBound {
+ paren_token: Some(paren_token),
+ ..trait_bound
+ })
+ }
+ other @ (TypeParamBound::Lifetime(_)
+ | TypeParamBound::Verbatim(_)) => other,
+ }
+ }
+ _ => break,
+ };
+ return Ok(Type::TraitObject(TypeTraitObject {
+ dyn_token: None,
+ bounds: {
+ let mut bounds = Punctuated::new();
+ bounds.push_value(first);
+ while let Some(plus) = input.parse()? {
+ bounds.push_punct(plus);
+ bounds.push_value(input.parse()?);
+ }
+ bounds
+ },
+ }));
+ }
+ }
+ Ok(Type::Paren(TypeParen {
+ paren_token,
+ elem: Box::new(first),
+ }))
+ } else if lookahead.peek(Token![fn])
+ || lookahead.peek(Token![unsafe])
+ || lookahead.peek(Token![extern])
+ {
+ let mut bare_fn: TypeBareFn = input.parse()?;
+ bare_fn.lifetimes = lifetimes;
+ Ok(Type::BareFn(bare_fn))
+ } else if lookahead.peek(Ident)
+ || input.peek(Token![super])
+ || input.peek(Token![self])
+ || input.peek(Token![Self])
+ || input.peek(Token![crate])
+ || lookahead.peek(Token![::])
+ || lookahead.peek(Token![<])
+ {
+ let ty: TypePath = input.parse()?;
+ if ty.qself.is_some() {
+ return Ok(Type::Path(ty));
+ }
+
+ if input.peek(Token![!]) && !input.peek(Token![!=]) && ty.path.is_mod_style() {
+ let bang_token: Token![!] = input.parse()?;
+ let (delimiter, tokens) = mac::parse_delimiter(input)?;
+ return Ok(Type::Macro(TypeMacro {
+ mac: Macro {
+ path: ty.path,
+ bang_token,
+ delimiter,
+ tokens,
+ },
+ }));
+ }
+
+ if lifetimes.is_some() || allow_plus && input.peek(Token![+]) {
+ let mut bounds = Punctuated::new();
+ bounds.push_value(TypeParamBound::Trait(TraitBound {
+ paren_token: None,
+ modifier: TraitBoundModifier::None,
+ lifetimes,
+ path: ty.path,
+ }));
+ if allow_plus {
+ while input.peek(Token![+]) {
+ bounds.push_punct(input.parse()?);
+ if !(input.peek(Ident::peek_any)
+ || input.peek(Token![::])
+ || input.peek(Token![?])
+ || input.peek(Lifetime)
+ || input.peek(token::Paren))
+ {
+ break;
+ }
+ bounds.push_value(input.parse()?);
+ }
+ }
+ return Ok(Type::TraitObject(TypeTraitObject {
+ dyn_token: None,
+ bounds,
+ }));
+ }
+
+ Ok(Type::Path(ty))
+ } else if lookahead.peek(Token![dyn]) {
+ let dyn_token: Token![dyn] = input.parse()?;
+ let dyn_span = dyn_token.span;
+ let star_token: Option<Token![*]> = input.parse()?;
+ let bounds = TypeTraitObject::parse_bounds(dyn_span, input, allow_plus)?;
+ return Ok(if star_token.is_some() {
+ Type::Verbatim(verbatim::between(&begin, input))
+ } else {
+ Type::TraitObject(TypeTraitObject {
+ dyn_token: Some(dyn_token),
+ bounds,
+ })
+ });
+ } else if lookahead.peek(token::Bracket) {
+ let content;
+ let bracket_token = bracketed!(content in input);
+ let elem: Type = content.parse()?;
+ if content.peek(Token![;]) {
+ Ok(Type::Array(TypeArray {
+ bracket_token,
+ elem: Box::new(elem),
+ semi_token: content.parse()?,
+ len: content.parse()?,
+ }))
+ } else {
+ Ok(Type::Slice(TypeSlice {
+ bracket_token,
+ elem: Box::new(elem),
+ }))
+ }
+ } else if lookahead.peek(Token![*]) {
+ input.parse().map(Type::Ptr)
+ } else if lookahead.peek(Token![&]) {
+ input.parse().map(Type::Reference)
+ } else if lookahead.peek(Token![!]) && !input.peek(Token![=]) {
+ input.parse().map(Type::Never)
+ } else if lookahead.peek(Token![impl]) {
+ TypeImplTrait::parse(input, allow_plus).map(Type::ImplTrait)
+ } else if lookahead.peek(Token![_]) {
+ input.parse().map(Type::Infer)
+ } else if lookahead.peek(Lifetime) {
+ input.parse().map(Type::TraitObject)
+ } else {
+ Err(lookahead.error())
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeSlice {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let content;
+ Ok(TypeSlice {
+ bracket_token: bracketed!(content in input),
+ elem: content.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeArray {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let content;
+ Ok(TypeArray {
+ bracket_token: bracketed!(content in input),
+ elem: content.parse()?,
+ semi_token: content.parse()?,
+ len: content.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypePtr {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let star_token: Token![*] = input.parse()?;
+
+ let lookahead = input.lookahead1();
+ let (const_token, mutability) = if lookahead.peek(Token![const]) {
+ (Some(input.parse()?), None)
+ } else if lookahead.peek(Token![mut]) {
+ (None, Some(input.parse()?))
+ } else {
+ return Err(lookahead.error());
+ };
+
+ Ok(TypePtr {
+ star_token,
+ const_token,
+ mutability,
+ elem: Box::new(input.call(Type::without_plus)?),
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeReference {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(TypeReference {
+ and_token: input.parse()?,
+ lifetime: input.parse()?,
+ mutability: input.parse()?,
+ // & binds tighter than +, so we don't allow + here.
+ elem: Box::new(input.call(Type::without_plus)?),
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeBareFn {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let args;
+ let mut variadic = None;
+
+ Ok(TypeBareFn {
+ lifetimes: input.parse()?,
+ unsafety: input.parse()?,
+ abi: input.parse()?,
+ fn_token: input.parse()?,
+ paren_token: parenthesized!(args in input),
+ inputs: {
+ let mut inputs = Punctuated::new();
+
+ while !args.is_empty() {
+ let attrs = args.call(Attribute::parse_outer)?;
+
+ if inputs.empty_or_trailing()
+ && (args.peek(Token![...])
+ || args.peek(Ident)
+ && args.peek2(Token![:])
+ && args.peek3(Token![...]))
+ {
+ variadic = Some(parse_bare_variadic(&args, attrs)?);
+ break;
+ }
+
+ let allow_self = inputs.is_empty();
+ let arg = parse_bare_fn_arg(&args, allow_self)?;
+ inputs.push_value(BareFnArg { attrs, ..arg });
+ if args.is_empty() {
+ break;
+ }
+
+ let comma = args.parse()?;
+ inputs.push_punct(comma);
+ }
+
+ inputs
+ },
+ variadic,
+ output: input.call(ReturnType::without_plus)?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeNever {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(TypeNever {
+ bang_token: input.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeInfer {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(TypeInfer {
+ underscore_token: input.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeTuple {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let content;
+ let paren_token = parenthesized!(content in input);
+
+ if content.is_empty() {
+ return Ok(TypeTuple {
+ paren_token,
+ elems: Punctuated::new(),
+ });
+ }
+
+ let first: Type = content.parse()?;
+ Ok(TypeTuple {
+ paren_token,
+ elems: {
+ let mut elems = Punctuated::new();
+ elems.push_value(first);
+ elems.push_punct(content.parse()?);
+ while !content.is_empty() {
+ elems.push_value(content.parse()?);
+ if content.is_empty() {
+ break;
+ }
+ elems.push_punct(content.parse()?);
+ }
+ elems
+ },
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeMacro {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(TypeMacro {
+ mac: input.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypePath {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let expr_style = false;
+ let (qself, path) = path::parsing::qpath(input, expr_style)?;
+ Ok(TypePath { qself, path })
+ }
+ }
+
+ impl ReturnType {
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ pub fn without_plus(input: ParseStream) -> Result<Self> {
+ let allow_plus = false;
+ Self::parse(input, allow_plus)
+ }
+
+ pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
+ if input.peek(Token![->]) {
+ let arrow = input.parse()?;
+ let allow_group_generic = true;
+ let ty = ambig_ty(input, allow_plus, allow_group_generic)?;
+ Ok(ReturnType::Type(arrow, Box::new(ty)))
+ } else {
+ Ok(ReturnType::Default)
+ }
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for ReturnType {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_plus = true;
+ Self::parse(input, allow_plus)
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeTraitObject {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_plus = true;
+ Self::parse(input, allow_plus)
+ }
+ }
+
+ impl TypeTraitObject {
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ pub fn without_plus(input: ParseStream) -> Result<Self> {
+ let allow_plus = false;
+ Self::parse(input, allow_plus)
+ }
+
+ // Only allow multiple trait references if allow_plus is true.
+ pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
+ let dyn_token: Option<Token![dyn]> = input.parse()?;
+ let dyn_span = match &dyn_token {
+ Some(token) => token.span,
+ None => input.span(),
+ };
+ let bounds = Self::parse_bounds(dyn_span, input, allow_plus)?;
+ Ok(TypeTraitObject { dyn_token, bounds })
+ }
+
+ fn parse_bounds(
+ dyn_span: Span,
+ input: ParseStream,
+ allow_plus: bool,
+ ) -> Result<Punctuated<TypeParamBound, Token![+]>> {
+ let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
+ let mut last_lifetime_span = None;
+ let mut at_least_one_trait = false;
+ for bound in &bounds {
+ match bound {
+ TypeParamBound::Trait(_) | TypeParamBound::Verbatim(_) => {
+ at_least_one_trait = true;
+ break;
+ }
+ TypeParamBound::Lifetime(lifetime) => {
+ last_lifetime_span = Some(lifetime.ident.span());
+ }
+ }
+ }
+ // Just lifetimes like `'a + 'b` is not a TraitObject.
+ if !at_least_one_trait {
+ let msg = "at least one trait is required for an object type";
+ return Err(error::new2(dyn_span, last_lifetime_span.unwrap(), msg));
+ }
+ Ok(bounds)
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeImplTrait {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_plus = true;
+ Self::parse(input, allow_plus)
+ }
+ }
+
+ impl TypeImplTrait {
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ pub fn without_plus(input: ParseStream) -> Result<Self> {
+ let allow_plus = false;
+ Self::parse(input, allow_plus)
+ }
+
+ pub(crate) fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
+ let impl_token: Token![impl] = input.parse()?;
+ let bounds = TypeParamBound::parse_multiple(input, allow_plus)?;
+ let mut last_lifetime_span = None;
+ let mut at_least_one_trait = false;
+ for bound in &bounds {
+ match bound {
+ TypeParamBound::Trait(_) | TypeParamBound::Verbatim(_) => {
+ at_least_one_trait = true;
+ break;
+ }
+ TypeParamBound::Lifetime(lifetime) => {
+ last_lifetime_span = Some(lifetime.ident.span());
+ }
+ }
+ }
+ if !at_least_one_trait {
+ let msg = "at least one trait must be specified";
+ return Err(error::new2(
+ impl_token.span,
+ last_lifetime_span.unwrap(),
+ msg,
+ ));
+ }
+ Ok(TypeImplTrait { impl_token, bounds })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeGroup {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let group = crate::group::parse_group(input)?;
+ Ok(TypeGroup {
+ group_token: group.token,
+ elem: group.content.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for TypeParen {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_plus = false;
+ Self::parse(input, allow_plus)
+ }
+ }
+
+ impl TypeParen {
+ fn parse(input: ParseStream, allow_plus: bool) -> Result<Self> {
+ let content;
+ Ok(TypeParen {
+ paren_token: parenthesized!(content in input),
+ elem: Box::new({
+ let allow_group_generic = true;
+ ambig_ty(&content, allow_plus, allow_group_generic)?
+ }),
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for BareFnArg {
+ fn parse(input: ParseStream) -> Result<Self> {
+ let allow_self = false;
+ parse_bare_fn_arg(input, allow_self)
+ }
+ }
+
+ fn parse_bare_fn_arg(input: ParseStream, allow_self: bool) -> Result<BareFnArg> {
+ let attrs = input.call(Attribute::parse_outer)?;
+
+ let begin = input.fork();
+
+ let has_mut_self = allow_self && input.peek(Token![mut]) && input.peek2(Token![self]);
+ if has_mut_self {
+ input.parse::<Token![mut]>()?;
+ }
+
+ let mut has_self = false;
+ let mut name = if (input.peek(Ident) || input.peek(Token![_]) || {
+ has_self = allow_self && input.peek(Token![self]);
+ has_self
+ }) && input.peek2(Token![:])
+ && !input.peek2(Token![::])
+ {
+ let name = input.call(Ident::parse_any)?;
+ let colon: Token![:] = input.parse()?;
+ Some((name, colon))
+ } else {
+ has_self = false;
+ None
+ };
+
+ let ty = if allow_self && !has_self && input.peek(Token![mut]) && input.peek2(Token![self])
+ {
+ input.parse::<Token![mut]>()?;
+ input.parse::<Token![self]>()?;
+ None
+ } else if has_mut_self && name.is_none() {
+ input.parse::<Token![self]>()?;
+ None
+ } else {
+ Some(input.parse()?)
+ };
+
+ let ty = match ty {
+ Some(ty) if !has_mut_self => ty,
+ _ => {
+ name = None;
+ Type::Verbatim(verbatim::between(&begin, input))
+ }
+ };
+
+ Ok(BareFnArg { attrs, name, ty })
+ }
+
+ fn parse_bare_variadic(input: ParseStream, attrs: Vec<Attribute>) -> Result<BareVariadic> {
+ Ok(BareVariadic {
+ attrs,
+ name: if input.peek(Ident) || input.peek(Token![_]) {
+ let name = input.call(Ident::parse_any)?;
+ let colon: Token![:] = input.parse()?;
+ Some((name, colon))
+ } else {
+ None
+ },
+ dots: input.parse()?,
+ comma: input.parse()?,
+ })
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for Abi {
+ fn parse(input: ParseStream) -> Result<Self> {
+ Ok(Abi {
+ extern_token: input.parse()?,
+ name: input.parse()?,
+ })
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "parsing")))]
+ impl Parse for Option<Abi> {
+ fn parse(input: ParseStream) -> Result<Self> {
+ if input.peek(Token![extern]) {
+ input.parse().map(Some)
+ } else {
+ Ok(None)
+ }
+ }
+ }
+}
+
+#[cfg(feature = "printing")]
+mod printing {
+ use super::*;
+ use crate::attr::FilterAttrs;
+ use crate::print::TokensOrDefault;
+ use proc_macro2::TokenStream;
+ use quote::{ToTokens, TokenStreamExt};
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeSlice {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.bracket_token.surround(tokens, |tokens| {
+ self.elem.to_tokens(tokens);
+ });
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeArray {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.bracket_token.surround(tokens, |tokens| {
+ self.elem.to_tokens(tokens);
+ self.semi_token.to_tokens(tokens);
+ self.len.to_tokens(tokens);
+ });
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypePtr {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.star_token.to_tokens(tokens);
+ match &self.mutability {
+ Some(tok) => tok.to_tokens(tokens),
+ None => {
+ TokensOrDefault(&self.const_token).to_tokens(tokens);
+ }
+ }
+ self.elem.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeReference {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.and_token.to_tokens(tokens);
+ self.lifetime.to_tokens(tokens);
+ self.mutability.to_tokens(tokens);
+ self.elem.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeBareFn {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.lifetimes.to_tokens(tokens);
+ self.unsafety.to_tokens(tokens);
+ self.abi.to_tokens(tokens);
+ self.fn_token.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() {
+ let span = variadic.dots.spans[0];
+ Token![,](span).to_tokens(tokens);
+ }
+ variadic.to_tokens(tokens);
+ }
+ });
+ self.output.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeNever {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.bang_token.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeTuple {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.paren_token.surround(tokens, |tokens| {
+ self.elems.to_tokens(tokens);
+ // If we only have one argument, we need a trailing comma to
+ // distinguish TypeTuple from TypeParen.
+ if self.elems.len() == 1 && !self.elems.trailing_punct() {
+ <Token![,]>::default().to_tokens(tokens);
+ }
+ });
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypePath {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ path::printing::print_path(tokens, &self.qself, &self.path);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeTraitObject {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.dyn_token.to_tokens(tokens);
+ self.bounds.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeImplTrait {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.impl_token.to_tokens(tokens);
+ self.bounds.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeGroup {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.group_token.surround(tokens, |tokens| {
+ self.elem.to_tokens(tokens);
+ });
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeParen {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.paren_token.surround(tokens, |tokens| {
+ self.elem.to_tokens(tokens);
+ });
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeInfer {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.underscore_token.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for TypeMacro {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.mac.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for ReturnType {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ match self {
+ ReturnType::Default => {}
+ ReturnType::Type(arrow, ty) => {
+ arrow.to_tokens(tokens);
+ ty.to_tokens(tokens);
+ }
+ }
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for BareFnArg {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ if let Some((name, colon)) = &self.name {
+ name.to_tokens(tokens);
+ colon.to_tokens(tokens);
+ }
+ self.ty.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for BareVariadic {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ tokens.append_all(self.attrs.outer());
+ if let Some((name, colon)) = &self.name {
+ name.to_tokens(tokens);
+ colon.to_tokens(tokens);
+ }
+ self.dots.to_tokens(tokens);
+ self.comma.to_tokens(tokens);
+ }
+ }
+
+ #[cfg_attr(doc_cfg, doc(cfg(feature = "printing")))]
+ impl ToTokens for Abi {
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ self.extern_token.to_tokens(tokens);
+ self.name.to_tokens(tokens);
+ }
+ }
+}
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