Struct LitFloat

pub struct LitFloat { /* private fields */ }

A string of ascii digits followed by a ., and then another string of ascii digits.

Implementations

impl LitFloat

pub const fn value(&self) -> f64

Returns the value of this literal.

Examples found in repository

examples/lox/interpreter.rs (line 591)

    fn evaluate(&self) -> Value {
        match self {
            Literal::False(_) => Value::Bool(false),
            Literal::Float(value) => Value::Number(value.value()),
            #[allow(clippy::cast_precision_loss)]
            Literal::Int(value) => Value::Number(value.value() as f64),
            Literal::Nil(_) => Value::Nil,
            Literal::String(string) => Value::String(string.string().clone()),
            Literal::True(_) => Value::Bool(true),
        }
    }

examples/calc.rs (line 84)

fn primary(input: ParseStream) -> Result<Expr> {
    let lookahead = input.lookahead();
    if lookahead.peek(token::LitFloat) {
        Ok(Expr::Num(input.parse::<token::LitFloat>()?.value()))
    } else if lookahead.peek(token::LitInt) {
        Ok(Expr::Num(input.parse::<token::LitInt>()?.value() as f64))
    } else if lookahead.peek(token::LeftParen) {
        let group: Group<Parentheses> = input.parse()?;
        parse(group.into_token_stream())
    } else {
        Err(lookahead.error())
    }
}

pub const fn new(value: f64, span: Span) -> LitFloat

Constructs a new LitFloat with the given value and span.

Trait Implementations

impl Clone for LitFloat

fn clone(&self) -> LitFloat

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LitFloat

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

Formats the value using the given formatter.

impl Parse for LitFloat

fn parse(input: ParseStream<'_>) -> Result<Self>

Parses the input into this type.

impl PartialEq for LitFloat

fn eq(&self, other: &Self) -> 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 PartialOrd for LitFloat

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl ToTokens for LitFloat

fn to_tokens(&self, tokens: &mut TokenStream)

Append self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream.

impl ToTokens for LitFloat

Available on crate feature proc-macro2 only.

fn to_tokens(&self, tokens: &mut TokenStream2)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream2

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream2

Convert self directly into a TokenStream object.

impl Token for LitFloat

fn span(&self) -> &Span

Returns the span covered by this token.