Enum rustc_expand::mbe::TokenTree[−][src]

enum TokenTree {
    Token(Token),
    Delimited(DelimSpan, Lrc<Delimited>),
    Sequence(DelimSpan, Lrc<SequenceRepetition>),
    MetaVar(Span, Ident),
    MetaVarDecl(Span, Ident, Option<NonterminalKind>),
}
Expand description

Similar to tokenstream::TokenTree, except that $i, $i:ident, and $(...) are “first-class” token trees. Useful for parsing macros.

Variants

Token(Token)
Delimited(DelimSpan, Lrc<Delimited>)
Sequence(DelimSpan, Lrc<SequenceRepetition>)
Expand description

A kleene-style repetition sequence

MetaVar(Span, Ident)
Expand description

e.g., $var

MetaVarDecl(Span, Ident, Option<NonterminalKind>)
Expand description

e.g., $var:expr. This is only used in the left hand side of MBE macros.

Implementations

impl TokenTree[src]

fn len(&self) -> usize[src]

Return the number of tokens in the tree.

fn is_delimited(&self) -> bool[src]

Returns true if the given token tree is delimited.

fn is_token(&self, expected_kind: &TokenKind) -> bool[src]

Returns true if the given token tree is a token of the given kind.

fn get_tt(&self, index: usize) -> TokenTree[src]

Gets the index-th sub-token-tree. This only makes sense for delimited trees and sequences.

fn span(&self) -> Span[src]

Retrieves the TokenTree’s span.

fn token(kind: TokenKind, span: Span) -> TokenTree[src]

Trait Implementations

impl Clone for TokenTree[src]

fn clone(&self) -> TokenTree[src]

Returns a copy of the value. Read more

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Debug for TokenTree[src]

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

Formats the value using the given formatter. Read more

impl<__D: Decoder> Decodable<__D> for TokenTree[src]

fn decode(__decoder: &mut __D) -> Result<Self, <__D as Decoder>::Error>[src]

impl<__E: Encoder> Encodable<__E> for TokenTree[src]

fn encode(&self, __encoder: &mut __E) -> Result<(), <__E as Encoder>::Error>[src]

impl PartialEq<TokenTree> for TokenTree[src]

fn eq(&self, other: &TokenTree) -> bool[src]

This method tests for self and other values to be equal, and is used by ==. Read more

fn ne(&self, other: &TokenTree) -> bool[src]

This method tests for !=.

impl StructuralPartialEq for TokenTree[src]

Auto Trait Implementations

impl !RefUnwindSafe for TokenTree

impl !Send for TokenTree

impl !Sync for TokenTree

impl Unpin for TokenTree

impl !UnwindSafe for TokenTree

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized, [src]

pub fn type_id(&self) -> TypeId[src]

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T where
    T: ?Sized, [src]

pub fn borrow(&self) -> &T[src]

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T where
    T: ?Sized, [src]

pub fn borrow_mut(&mut self) -> &mut T[src]

Mutably borrows from an owned value. Read more

impl<T> From<T> for T[src]

pub fn from(t: T) -> T[src]

Performs the conversion.

impl<T, U> Into<U> for T where
    U: From<T>, [src]

pub fn into(self) -> U[src]

Performs the conversion.

impl<T> ToOwned for T where
    T: Clone, [src]

type Owned = T

The resulting type after obtaining ownership.

pub fn to_owned(&self) -> T[src]

Creates owned data from borrowed data, usually by cloning. Read more

pub fn clone_into(&self, target: &mut T)[src]

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T where
    U: Into<T>, [src]

type Error = Infallible

The type returned in the event of a conversion error.

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]

Performs the conversion.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, [src]

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

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]

Performs the conversion.