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 CeilFn {}

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

impl QalamCallable for CeilFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let num = &arguments[0];
        if let Some(Literal::Number(num)) = num {
            return Ok(Some(Literal::Number(OrderedFloat(num.ceil()))));
        } else {
            return Err(RuntimeError::init(
                paren,
                format!("'num' must be a number!"),
            ));
        }
    }

    fn arity(&self) -> usize {
        return 1;
    }

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

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

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