ksl 0.1.30

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

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 {
        let obj = eval_apply(object, env.clone())?;
        match (&obj, eval_apply(key, env)?) {
            (Value::Object(_, dict), Value::Atom(key_name)) => match dict.get(&key_name) {
                Some(val) => Ok(val.as_ref().clone()),
                None => Err(std::sync::Arc::from(format!(
                    concat!("Error[ksl::builtin::Get]: ", "Unknown key `{}` for `{}`."),
                    key_name, obj
                ))),
            },
            (Value::Object(_, _), e) => Err(std::sync::Arc::from(format!(
                concat!("Error[ksl::builtin::Get]: ", "Unexpected value: `{}`."),
                e
            ))),
            (e, _) => Err(std::sync::Arc::from(format!(
                concat!("Error[ksl::builtin::Get]: ", "Unexpected value: `{}`."),
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Get]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}