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 ReplaceFn {}

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

impl QalamCallable for ReplaceFn {
    fn call(
        &mut self,
        _interpreter: &mut Interpreter,
        arguments: Vec<Option<Literal>>,
        paren: &Token,
    ) -> Result<Option<Literal>, RuntimeError> {
        let arg = &arguments[0];
        let old_substr = &arguments[1];
        let new_substr = &arguments[2];

        if let (Some(arg), Some(old_substr), Some(new_substr)) = (arg, old_substr, new_substr) {
            if let (
                Literal::String(arg),
                Literal::String(old_substr),
                Literal::String(new_substr),
            ) = (arg, old_substr, new_substr)
            {
                let res = arg.replace(old_substr, &new_substr);
                return Ok(Some(Literal::String(res)));
            } else {
                return Err(RuntimeError::init(
                    paren,
                    format!("All arguments must be strings!"),
                ));
            }
        } else {
            return Err(RuntimeError::init(
                paren,
                format!("All arguments must be defined!"),
            ));
        }
    }

    fn arity(&self) -> usize {
        return 3;
    }

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

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

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