Enum rustc_expand::mbe::TokenTree

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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>)`

A kleene-style repetition sequence

`MetaVar(Span, Ident)`

e.g., $var

`MetaVarDecl(Span, Ident, Option<NonterminalKind>)`

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

Implementations

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impl TokenTree

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fn len(&self) -> usize

Return the number of tokens in the tree.

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fn is_delimited(&self) -> bool

Returns true if the given token tree is delimited.

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

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

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

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

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fn span(&self) -> Span

Retrieves the TokenTree’s span.

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

Trait Implementations

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impl Clone for TokenTree

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fn clone(&self) -> TokenTree

Returns a copy of the value. Read more

1.0.0 · source

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

Performs copy-assignment from source. Read more

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impl Debug for TokenTree

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

Formats the value using the given formatter. Read more

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

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

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

This method tests for !=.

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impl StructuralPartialEq for TokenTree

Auto Trait Implementations

impl !RefUnwindSafe for TokenTree

impl !UnwindSafe for TokenTree

Blanket Implementations

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

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pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

pub 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

const: unstable · source

pub fn from(t: T) -> T

Performs the conversion.

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

const: unstable · source

pub fn into(self) -> U

Performs the conversion.

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impl<T> ToOwned for T where
T: Clone,

type Owned = T

The resulting type after obtaining ownership.

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pub fn to_owned(&self) -> T

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

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

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

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

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impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

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

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

pub fn try_into(self) -> Result<U, >::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

Size for each variant:

Token: 31 bytes
Delimited: 31 bytes
Sequence: 31 bytes
MetaVar: 23 bytes
MetaVarDecl: 23 bytes

Enum rustc_expand::mbe::TokenTree

Variants

Token(Token)

Delimited(DelimSpan, Lrc<Delimited>)

Sequence(DelimSpan, Lrc<SequenceRepetition>)

MetaVar(Span, Ident)

MetaVarDecl(Span, Ident, Option<NonterminalKind>)

Implementations

impl TokenTree

fn len(&self) -> usize

fn is_delimited(&self) -> bool

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

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

fn span(&self) -> Span

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

Trait Implementations

impl Clone for TokenTree

fn clone(&self) -> TokenTree

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

impl Debug for TokenTree

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

impl<__D: Decoder> Decodable<__D> for TokenTree

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

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

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

impl PartialEq<TokenTree> for TokenTree

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

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

impl StructuralPartialEq for TokenTree

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,

pub fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

pub fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

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

impl<T> From<T> for T

pub fn from(t: T) -> T

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

pub fn into(self) -> U

impl<T> ToOwned for T where T: Clone,

type Owned = T

pub fn to_owned(&self) -> T

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

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

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

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

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

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

Layout

`Token(Token)`

`Delimited(DelimSpan, Lrc<Delimited>)`

`Sequence(DelimSpan, Lrc<SequenceRepetition>)`

`MetaVar(Span, Ident)`

`MetaVarDecl(Span, Ident, Option<NonterminalKind>)`

impl<D: Decoder> Decodable<D> for TokenTree

fn decode(decoder: &mut D) -> Self

impl<E: Encoder> Encodable<E> for TokenTree

fn encode(&self, encoder: &mut E) -> Result<(), <__E as Encoder>::Error>

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

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

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

impl<T> ToOwned for T where
T: Clone,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,