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(Debug, Clone)]
pub struct RandomIntFn {}

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

impl QalamCallable for RandomIntFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let min = &arguments[0];
        let max = &arguments[1];
        if let (Some(min), Some(max)) = (min, max) {
            if let (Literal::Number(min), Literal::Number(max)) = (min, max) {
                if !is_int(**min) {
                    return Err(RuntimeError::init(
                        paren,
                        format!("'min' must be an integer!"),
                    ));
                }

                if !is_int(**max) {
                    return Err(RuntimeError::init(
                        paren,
                        format!("'max' must be an integer!"),
                    ));
                }
                let min = **min as i32;
                let max = **max as i32;
                if min > max {
                    return Err(RuntimeError::init(
                        paren,
                        format!("'max' must be greater than or equal to 'min'"),
                    ));
                }
                let mut rng = rand::thread_rng();
                let res: i32 = rng.gen_range(min..max);
                return Ok(Some(Literal::Number(OrderedFloat(res as f64))));
            } else {
                return Err(RuntimeError::init(
                    paren,
                    format!("All arguments must be numbers!"),
                ));
            }
        } else {
            return Err(RuntimeError::init(
                paren,
                format!("All arguments must be defined!"),
            ));
        }
    }

    fn arity(&self) -> usize {
        return 2;
    }

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

    fn to_string(&self) -> String {
        return String::from("<native amal random_int(min, max)>");
    }

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