Enum rustc_ast::ast::LitKind

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pub enum LitKind {
    Str(Symbol, StrStyle),
    ByteStr(Lrc<[u8]>, StrStyle),
    CStr(Lrc<[u8]>, StrStyle),
    Byte(u8),
    Char(char),
    Int(u128, LitIntType),
    Float(Symbol, LitFloatType),
    Bool(bool),
    Err,
}
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(u128, 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

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: Decoder> 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: Encoder> 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 LitKindwhere __CTX: HashStableContext,

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

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impl PartialEq<LitKind> for LitKind

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

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impl StructuralEq for LitKind

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impl StructuralPartialEq for LitKind

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> ToString for Twhere 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 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: 32 bytes

Size for each variant:

  • Str: 7 bytes
  • ByteStr: 23 bytes
  • CStr: 23 bytes
  • Byte: 1 byte
  • Char: 7 bytes
  • Int: 31 bytes
  • Float: 7 bytes
  • Bool: 1 byte
  • Err: 0 bytes