pub enum TokenKind {
Show 37 variants Eq, Lt, Le, EqEq, Ne, Ge, Gt, AndAnd, OrOr, Not, Tilde, BinOp(BinOpToken), BinOpEq(BinOpToken), At, Dot, DotDot, DotDotDot, DotDotEq, Comma, Semi, Colon, ModSep, RArrow, LArrow, FatArrow, Pound, Dollar, Question, SingleQuote, OpenDelim(Delimiter), CloseDelim(Delimiter), Literal(Lit), Ident(Symbol, bool), Lifetime(Symbol), Interpolated(Lrc<Nonterminal>), DocComment(CommentKind, AttrStyle, Symbol), Eof,
}

Variants§

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Eq

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Lt

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Le

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EqEq

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Ne

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Ge

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Gt

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AndAnd

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OrOr

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Not

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Tilde

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BinOp(BinOpToken)

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BinOpEq(BinOpToken)

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At

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Dot

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DotDot

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DotDotDot

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DotDotEq

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Comma

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Semi

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Colon

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ModSep

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RArrow

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LArrow

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FatArrow

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Pound

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Dollar

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Question

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SingleQuote

Used by proc macros for representing lifetimes, not generated by lexer right now.

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OpenDelim(Delimiter)

An opening delimiter (e.g., {).

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CloseDelim(Delimiter)

A closing delimiter (e.g., }).

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Literal(Lit)

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Ident(Symbol, bool)

Identifier token. Do not forget about NtIdent when you want to match on identifiers. It’s recommended to use Token::(ident,uninterpolate,uninterpolated_span) to treat regular and interpolated identifiers in the same way.

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Lifetime(Symbol)

Lifetime identifier token. Do not forget about NtLifetime when you want to match on lifetime identifiers. It’s recommended to use Token::(lifetime,uninterpolate,uninterpolated_span) to treat regular and interpolated lifetime identifiers in the same way.

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Interpolated(Lrc<Nonterminal>)

An embedded AST node, as produced by a macro. This only exists for historical reasons. We’d like to get rid of it, for multiple reasons.

  • It’s conceptually very strange. Saying a token can contain an AST node is like saying, in natural language, that a word can contain a sentence.
  • It requires special handling in a bunch of places in the parser.
  • It prevents Token from implementing Copy. It adds complexity and likely slows things down. Please don’t add new occurrences of this token kind!
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DocComment(CommentKind, AttrStyle, Symbol)

A doc comment token. Symbol is the doc comment’s data excluding its “quotes” (///, /**, etc) similarly to symbols in string literal tokens.

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Eof

Implementations§

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impl TokenKind

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pub fn lit(kind: LitKind, symbol: Symbol, suffix: Option<Symbol>) -> TokenKind

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pub fn break_two_token_op(&self) -> Option<(TokenKind, TokenKind)>

An approximation to proc-macro-style single-character operators used by rustc parser. If the operator token can be broken into two tokens, the first of which is single-character, then this function performs that operation, otherwise it returns None.

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pub fn similar_tokens(&self) -> Option<Vec<TokenKind>>

Returns tokens that are likely to be typed accidentally instead of the current token. Enables better error recovery when the wrong token is found.

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pub fn should_end_const_arg(&self) -> bool

Trait Implementations§

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impl Clone for TokenKind

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fn clone(&self) -> Self

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 TokenKind

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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 TokenKind

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

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

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

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impl<__CTX> HashStable<__CTX> for TokenKindwhere __CTX: HashStableContext,

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fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

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impl PartialEq<TokenKind> for Token

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fn eq(&self, rhs: &TokenKind) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialEq<TokenKind> for TokenKind

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

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl StructuralPartialEq for TokenKind

Auto Trait Implementations§

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: 16 bytes

Size for each variant:

  • Eq: 0 bytes
  • Lt: 0 bytes
  • Le: 0 bytes
  • EqEq: 0 bytes
  • Ne: 0 bytes
  • Ge: 0 bytes
  • Gt: 0 bytes
  • AndAnd: 0 bytes
  • OrOr: 0 bytes
  • Not: 0 bytes
  • Tilde: 0 bytes
  • BinOp: 1 byte
  • BinOpEq: 1 byte
  • At: 0 bytes
  • Dot: 0 bytes
  • DotDot: 0 bytes
  • DotDotDot: 0 bytes
  • DotDotEq: 0 bytes
  • Comma: 0 bytes
  • Semi: 0 bytes
  • Colon: 0 bytes
  • ModSep: 0 bytes
  • RArrow: 0 bytes
  • LArrow: 0 bytes
  • FatArrow: 0 bytes
  • Pound: 0 bytes
  • Dollar: 0 bytes
  • Question: 0 bytes
  • SingleQuote: 0 bytes
  • OpenDelim: 1 byte
  • CloseDelim: 1 byte
  • Literal: 15 bytes
  • Ident: 7 bytes
  • Lifetime: 7 bytes
  • Interpolated: 15 bytes
  • DocComment: 7 bytes
  • Eof: 0 bytes