Struct NativeFunction

pub struct NativeFunction {
    pub name: Token,
    /* private fields */
}

Represents a native function. This is a special type of function that is used to implement built-in functions. These functions are external to the language and are implemented in Rust. They are used to provide access to the host environment.

Native functions are defined in the NativeFunction::get_globals method and used during the initialization of the Interpreter. These functions will be available to the user in the global scope.

Current native functions:

• clock() - Returns the current time in milliseconds.
• input() - Reads a line of string from the standard input.

Fields

name: Token

Implementations

impl NativeFunction

pub fn get_globals() -> Vec<NativeFunction>

Returns a list of native functions with their implementations.

Trait Implementations

impl Callable for NativeFunction

fn call( &self, interpreter: &mut Interpreter<'_>, arguments: Vec<Object>, ) -> Result<Object, RuntimeError>

Calls the native function and returns its return value.

fn arity(&self) -> usize

Returns the arity of the object.

impl Clone for NativeFunction

fn clone(&self) -> NativeFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NativeFunction

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

Formats the value using the given formatter.

impl Display for NativeFunction

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

Formats the value using the given formatter.

impl From<NativeFunction> for Object

fn from(value: NativeFunction) -> Self

Converts to this type from the input type.

impl PartialEq for NativeFunction

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

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

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

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