qalam 0.3.1

Interpreter for the Qalam programming language. Qalam is a dead-simple, Urdu inspired, interpreted programming langauge.
Documentation 
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use crate::native::*;

#[derive(Clone, Debug)]
pub struct ClockFn {}

impl ClockFn {
    pub fn init() -> Self {
        return Self {};
    }
}

impl QalamCallable for ClockFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        _arguments: Vec<Option<Literal>>,
        _paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let start = std::time::SystemTime::now();
        let since_epoch = start
            .duration_since(std::time::UNIX_EPOCH)
            .expect("Time went backwards.");
        let millis = since_epoch.as_millis() as f64;
        return Ok(Some(Literal::Number(OrderedFloat(millis / 1000.0))));
    }

    fn arity(&self) -> usize {
        return 0;
    }

    fn to_string(&self) -> String {
        return String::from("<native amal clock>");
    }

    fn clone_box(&self) -> Box<dyn QalamCallable> {
        return Box::new(self.clone());
    }

    fn as_any(&self) -> &dyn std::any::Any {
        self
    }
}