Enum syntax::ast::NestedMetaItem

pub enum NestedMetaItem {
    MetaItem(MetaItem),
    Literal(Lit),
}

Possible values inside of compile-time attribute lists.

E.g., the '..' in #[name(..)].

Variants

MetaItem(MetaItem)

A full MetaItem, for recursive meta items.

Literal(Lit)

A literal.

E.g., "foo", 64, true.

Methods

impl NestedMetaItem

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

Returns the MetaItem if self is a NestedMetaItem::MetaItem.

pub fn literal(&self) -> Option<&Lit>

Returns the Lit if self is a NestedMetaItem::Literal.

pub fn check_name<T>(&self, name: T) -> bool where
    Path: PartialEq<T>, 

Returns true if this list item is a MetaItem with a name of name.

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

For a single-segment meta-item returns its name, otherwise returns None.

pub fn name_or_empty(&self) -> LocalInternedString

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

Gets the string value if self is a MetaItem and the MetaItem is a MetaItemKind::NameValue variant containing a string, otherwise None.

pub fn name_value_literal(&self) -> Option<(Name, &Lit)>

Returns a name and single literal value tuple of the MetaItem.

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

Gets a list of inner meta items from a list MetaItem type.

pub fn is_meta_item(&self) -> bool

Returns true if the variant is MetaItem.

pub fn is_literal(&self) -> bool

Returns true if the variant is Literal.

pub fn is_word(&self) -> bool

Returns true if self is a MetaItem and the meta item is a word.

pub fn is_value_str(&self) -> bool

Returns true if self is a MetaItem and the meta item is a ValueString.

pub fn is_meta_item_list(&self) -> bool

Returns true if self is a MetaItem and the meta item is a list.

impl NestedMetaItem

pub fn span(&self) -> Span

Trait Implementations

impl Clone for NestedMetaItem

fn clone(&self) -> NestedMetaItem

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NestedMetaItem

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

Formats the value using the given formatter.

impl Encodable for NestedMetaItem

fn encode<__S: Encoder>(&self, s: &mut __S) -> Result<(), __S::Error>

impl Decodable for NestedMetaItem

fn decode<__D: Decoder>(d: &mut __D) -> Result<NestedMetaItem, __D::Error>