pub struct MetaItem {
pub path: Path,
pub kind: MetaItemKind,
pub span: Span,
}
Expand description
A semantic representation of a meta item. A meta item is a slightly restricted form of an attribute – it can only contain expressions in certain leaf positions, rather than arbitrary token streams – that is used for most built-in attributes.
E.g., #[test]
, #[derive(..)]
, #[rustfmt::skip]
or #[feature = "foo"]
.
Fields§
§path: Path
§kind: MetaItemKind
§span: Span
Implementations§
source§impl MetaItem
impl MetaItem
sourcepub fn ident(&self) -> Option<Ident>
pub fn ident(&self) -> Option<Ident>
For a single-segment meta item, returns its name; otherwise, returns None
.
pub fn name_or_empty(&self) -> Symbol
sourcepub fn name_value_literal(&self) -> Option<&MetaItemLit>
pub fn name_value_literal(&self) -> Option<&MetaItemLit>
Example:
#[attribute(name = "value")]
^^^^^^^^^^^^^^
pub fn value_str(&self) -> Option<Symbol>
pub fn meta_item_list(&self) -> Option<&[NestedMetaItem]>
pub fn is_word(&self) -> bool
pub fn has_name(&self, name: Symbol) -> bool
sourcepub fn name_value_literal_span(&self) -> Option<Span>
pub fn name_value_literal_span(&self) -> Option<Span>
This is used in case you want the value span instead of the whole attribute. Example:
#[doc(alias = "foo")]
In here, it’ll return a span for "foo"
.
Trait Implementations§
source§impl<__CTX> HashStable<__CTX> for MetaItemwhere
__CTX: HashStableContext,
impl<__CTX> HashStable<__CTX> for MetaItemwhere
__CTX: HashStableContext,
fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)
Auto Trait Implementations§
impl !RefUnwindSafe for MetaItem
impl !Send for MetaItem
impl !Sync for MetaItem
impl Unpin for MetaItem
impl !UnwindSafe for MetaItem
Blanket Implementations§
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: 72 bytes