ksl 0.1.30

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

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 [module, sym] = args {
        match sym {
            Value::Symbol(func_sym) => match eval_apply(module, env)? {
                Value::Module(_, mod_env) => match mod_env.get(func_sym) {
                    Some(val) => Ok(val.as_ref().clone()),
                    None => Err(std::sync::Arc::from(format!(
                        concat!("Error[ksl::builtin::Use]: ", "Unknown symbol `{}`."),
                        func_sym
                    ))),
                },
                e => Err(std::sync::Arc::from(format!(
                    concat!("Error[ksl::builtin::Use]: ", "Unexpected value: `{}`."),
                    e
                ))),
            },
            _ => Err(std::sync::Arc::from(format!(
                concat!("Error[ksl::builtin::Use]: ", "Unexpected value: `{}`."),
                sym
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Use]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}