Struct FloatLit

pub struct FloatLit<B: Buffer> { /* private fields */ }

A floating point literal, e.g. 3.14, 8., 135e12, 27f32 or 1.956e2f64.

This kind of literal has several forms, but generally consists of a main number part, an optional exponent and an optional type suffix. See the reference for more information.

A leading minus sign - is not part of the literal grammar! -3.14 are two tokens in the Rust grammar.

Implementations

impl<B: Buffer> FloatLit<B>

pub fn parse(s: B) -> Result<Self, ParseError>

Parses the input as a floating point literal. Returns an error if the input is invalid or represents a different kind of literal.

pub fn number_part(&self) -> &str

Returns the whole number part (including integer part, fractional part and exponent), but without the type suffix. If you want an actual floating point value, you need to parse this string, e.g. with f32::from_str or an external crate.

pub fn integer_part(&self) -> &str

Returns the non-empty integer part of this literal.

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

Returns the optional fractional part of this literal. Does not include the period. If a period exists in the input, Some is returned, None otherwise. Note that Some("") might be returned, e.g. for 3..

pub fn exponent_part(&self) -> &str

Optional exponent part. Might be empty if there was no exponent part in the input. Includes the e or E at the beginning.

pub fn type_suffix(&self) -> Option<FloatType>

The optional type suffix.

impl FloatLit<&str>

pub fn to_owned(&self) -> FloatLit<String>

Makes a copy of the underlying buffer and returns the owned version of Self.

Trait Implementations

impl<B: Clone + Buffer> Clone for FloatLit<B>

fn clone(&self) -> FloatLit<B>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<B: Debug + Buffer> Debug for FloatLit<B>

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

Formats the value using the given formatter.

impl<B: Buffer> Display for FloatLit<B>

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

Formats the value using the given formatter.

impl<B: Buffer> From<FloatLit<B>> for Literal<B>

fn from(src: FloatLit<B>) -> Self

Converts to this type from the input type.

impl<B: PartialEq + Buffer> PartialEq for FloatLit<B>

fn eq(&self, other: &FloatLit<B>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl TryFrom<&Literal> for FloatLit<String>

type Error = InvalidToken

The type returned in the event of a conversion error.

fn try_from(src: &Literal) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<&TokenTree> for FloatLit<String>

type Error = InvalidToken

The type returned in the event of a conversion error.

fn try_from(tt: &TokenTree) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<Literal> for FloatLit<String>

type Error = InvalidToken

The type returned in the event of a conversion error.

fn try_from(src: Literal) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<TokenTree> for FloatLit<String>

type Error = InvalidToken

The type returned in the event of a conversion error.

fn try_from(tt: TokenTree) -> Result<Self, Self::Error>

Performs the conversion.

impl<B: Copy + Buffer> Copy for FloatLit<B>

impl<B: Eq + Buffer> Eq for FloatLit<B>

impl<B: Buffer> StructuralPartialEq for FloatLit<B>