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 NumFn {}

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

impl QalamCallable for NumFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let arg = &arguments[0];
        if let Some(arg) = arg {
            if let Literal::String(arg) = arg {
                match arg.parse::<f64>() {
                    Ok(num) => return Ok(Some(Literal::Number(OrderedFloat(num)))),
                    Err(_e) => {
                        return Err(RuntimeError::init(
                            paren,
                            format!("Cannot convert \"{}\" to number.", arg),
                        ))
                    }
                }
            } else {
                return Err(RuntimeError::init(
                    paren,
                    format!("{} must be called with string type.", self.to_string()),
                ));
            }
        } else {
            return Err(RuntimeError::init(
                paren,
                format!("{} must be called with string type.", self.to_string()),
            ));
        }
    }

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

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

    fn to_string(&self) -> String {
        return String::from("<native amal str2num(arg)>");
    }

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