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 PopFn {}

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

impl QalamCallable for PopFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let arr = &arguments[0];
        if let Some(Literal::Array(arr)) = arr {
            let val = arr.0.as_ref().borrow_mut().elements.pop();
            if let Some(val) = val {
                return Ok(val);
            } else {
                return Ok(None);
            }
        } else {
            return Err(RuntimeError::init(
                paren,
                format!("'arr' must be an array!"),
            ));
        }
    }

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

    fn to_string(&self) -> String {
        return "<native amal pop(arr)>".to_string();
    }

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

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