Enum rustc_ast::ast::LitKind

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

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

Str(Symbol, StrStyle)

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

ByteStr(Lrc<[u8]>)

A byte string (b"foo").

Byte(u8)

A byte char (b'f').

Char(char)

A character literal ('a').

Int(u128, LitIntType)

An integer literal (1).

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.

Bool(bool)

A boolean literal (true, false).

Err

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

Implementations

impl LitKind

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

Converts literal token into a semantic literal.

pub fn to_token_lit(&self) -> Lit

Attempts to recover a token from semantic literal. This function is used when the original token doesn’t exist (e.g. the literal is created by an AST-based macro) or unavailable (e.g. from HIR pretty-printing).

impl LitKind

pub fn is_str(&self) -> bool

Returns true if this literal is a string.

pub fn is_bytestr(&self) -> bool

Returns true if this literal is byte literal string.

pub fn is_numeric(&self) -> bool

Returns true if this is a numeric literal.

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.

pub fn is_suffixed(&self) -> bool

Returns true if this literal has a suffix.

Trait Implementations

impl Clone for LitKind

fn clone(&self) -> LitKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LitKind

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

Formats the value using the given formatter.

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

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

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

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

impl Hash for LitKind

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

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

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

impl PartialEq<LitKind> for LitKind

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

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

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.

impl Eq for LitKind

impl StructuralEq for LitKind

impl StructuralPartialEq for LitKind

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