rustc_ast::ast

Enum LitKind

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pub enum LitKind {
    Str(Symbol, StrStyle),
    ByteStr(Lrc<[u8]>, StrStyle),
    CStr(Lrc<[u8]>, StrStyle),
    Byte(u8),
    Char(char),
    Int(Pu128, LitIntType),
    Float(Symbol, LitFloatType),
    Bool(bool),
    Err(ErrorGuaranteed),
}
Expand description

This type is used within both ast::MetaItemLit and hir::Lit.

Note that the entire literal (including the suffix) is considered when deciding the LitKind. This means that float literals like 1f32 are classified by this type as Float. This is different to token::LitKind which does not consider the suffix.

Variants§

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Str(Symbol, StrStyle)

A string literal ("foo"). The symbol is unescaped, and so may differ from the original token’s symbol.

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ByteStr(Lrc<[u8]>, StrStyle)

A byte string (b"foo"). Not stored as a symbol because it might be non-utf8, and symbols only allow utf8 strings.

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CStr(Lrc<[u8]>, StrStyle)

A C String (c"foo"). Guaranteed to only have \0 at the end.

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Byte(u8)

A byte char (b'f').

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Char(char)

A character literal ('a').

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Int(Pu128, LitIntType)

An integer literal (1).

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Float(Symbol, LitFloatType)

A float literal (1.0, 1f64 or 1E10f64). The pre-suffix part is stored as a symbol rather than f64 so that LitKind can impl Eq and Hash.

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Bool(bool)

A boolean literal (true, false).

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Err(ErrorGuaranteed)

Placeholder for a literal that wasn’t well-formed in some way.

Implementations§

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impl LitKind

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pub fn from_token_lit(lit: Lit) -> Result<LitKind, LitError>

Converts literal token into a semantic literal.

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impl LitKind

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

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pub fn is_str(&self) -> bool

Returns true if this literal is a string.

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pub fn is_bytestr(&self) -> bool

Returns true if this literal is byte literal string.

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pub fn is_numeric(&self) -> bool

Returns true if this is a numeric literal.

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pub fn is_unsuffixed(&self) -> bool

Returns true if this literal has no suffix. Note: this will return true for literals with prefixes such as raw strings and byte strings.

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pub fn is_suffixed(&self) -> bool

Returns true if this literal has a suffix.

Trait Implementations§

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impl Clone for LitKind

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fn clone(&self) -> LitKind

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 LitKind

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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: SpanDecoder> Decodable<__D> for LitKind

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

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impl Display for LitKind

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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<__E: SpanEncoder> Encodable<__E> for LitKind

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

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impl Hash for LitKind

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<__CTX> HashStable<__CTX> for LitKind
where __CTX: HashStableContext,

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

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impl PartialEq for LitKind

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

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for LitKind

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impl StructuralPartialEq for LitKind

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where 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 T
where 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 T
where 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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where 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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where 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 T
where 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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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: 24 bytes

Size for each variant:

  • Str: 7 bytes
  • ByteStr: 23 bytes
  • CStr: 23 bytes
  • Byte: 1 byte
  • Char: 7 bytes
  • Int: 23 bytes
  • Float: 7 bytes
  • Bool: 1 byte
  • Err: 0 bytes