Struct rustc_ast::ast::Attribute

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pub struct Attribute {
    pub kind: AttrKind,
    pub id: AttrId,
    pub style: AttrStyle,
    pub span: Span,
}
Expand description

A syntax-level representation of an attribute.

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§kind: AttrKind§id: AttrId§style: AttrStyle

Denotes if the attribute decorates the following construct (outer) or the construct this attribute is contained within (inner).

§span: Span

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impl Attribute

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pub fn get_normal_item(&self) -> &AttrItem

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pub fn unwrap_normal_item(self) -> AttrItem

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pub fn is_doc_comment(&self) -> bool

Returns true if it is a sugared doc comment (/// or //! for example). So #[doc = "doc"] (which is a doc comment) and #[doc(...)] (which is not a doc comment) will return false.

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pub fn ident(&self) -> Option<Ident>

For a single-segment attribute, returns its name; otherwise, returns None.

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pub fn name_or_empty(&self) -> Symbol

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pub fn has_name(&self, name: Symbol) -> bool

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pub fn path_matches(&self, name: &[Symbol]) -> bool

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pub fn is_word(&self) -> bool

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pub fn meta_item_list(&self) -> Option<ThinVec<NestedMetaItem>>

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pub fn value_str(&self) -> Option<Symbol>

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pub fn doc_str_and_comment_kind(&self) -> Option<(Symbol, CommentKind)>

Returns the documentation and its kind if this is a doc comment or a sugared doc comment.

  • ///doc returns Some(("doc", CommentKind::Line)).
  • /** doc */ returns Some(("doc", CommentKind::Block)).
  • #[doc = "doc"] returns Some(("doc", CommentKind::Line)).
  • #[doc(...)] returns None.
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pub fn doc_str(&self) -> Option<Symbol>

Returns the documentation if this is a doc comment or a sugared doc comment.

  • ///doc returns Some("doc").
  • #[doc = "doc"] returns Some("doc").
  • #[doc(...)] returns None.
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pub fn is_proc_macro_attr(&self) -> bool

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pub fn meta(&self) -> Option<MetaItem>

Extracts the MetaItem from inside this Attribute.

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pub fn meta_kind(&self) -> Option<MetaItemKind>

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pub fn tokens(&self) -> TokenStream

Trait Implementations§

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impl Clone for Attribute

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fn clone(&self) -> Attribute

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Attribute

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<__D: Decoder> Decodable<__D> for Attribute

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fn decode(__decoder: &mut __D) -> Self

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impl<__E: Encoder> Encodable<__E> for Attribute

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fn encode(&self, __encoder: &mut __E)

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impl HasAttrs for Attribute

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const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

This is true if this HasAttrs might support ‘custom’ (proc-macro) inner attributes. Attributes like #![cfg] and #![cfg_attr] are not considered ‘custom’ attributes. Read more
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fn attrs(&self) -> &[Attribute]

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fn visit_attrs(&mut self, _f: impl FnOnce(&mut AttrVec))

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impl HasTokens for Attribute

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impl<AstCtx: HashStableContext> HashStable<AstCtx> for Attribute

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fn hash_stable(&self, hcx: &mut AstCtx, hasher: &mut StableHasher)

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Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes