ksl 0.1.30

KSL core library and interpreter
Documentation 
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//! # ksl::builtin::delete
//!
//! Built-in function `Delete`.

use crate::{Environment, eval::apply::eval_apply, value::Value};

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [object, key] = args {
        match (eval_apply(object, env.clone())?, eval_apply(key, env)?) {
            (Value::Object(type_name, mut dict), Value::Atom(k)) => {
                let _ = dict.remove(&k);

                Ok(Value::Object(type_name, dict))
            }
            (Value::Object(_, _), e) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::Delete]: ",
                    "Expected an atom as key to delete, but got: `{}`."
                ),
                e
            ))),
            (e, _) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::Delete]: ",
                    "Expected an object, but got: `{}`."
                ),
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Delete]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}