ksl 0.1.30

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

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

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [sym_expr, path_expr] = args {
        // resolve path
        let path_val = eval_apply(path_expr, env.clone())?;

        match (sym_expr, path_val) {
            (Value::Symbol(plugin_sym), Value::String(path_str)) => {
                if let Some((lib_name, func_name)) = path_str.split_once('/') {
                    if is_invalid_symbol(plugin_sym) {
                        return Err(std::sync::Arc::from(format!(
                            concat!(
                                "Error[ksl::builtin::Plugin]: ",
                                "Rebinding of symbol `{}` is not permitted."
                            ),
                            plugin_sym
                        )));
                    }
                    let _ = env.store.write().insert(
                        plugin_sym.clone(),
                        std::sync::Arc::new(Value::Plugin(
                            std::sync::Arc::from(lib_name),
                            std::sync::Arc::from(func_name),
                        )),
                    );
                    Ok(Value::Unit)
                } else {
                    Err(std::sync::Arc::from(format!(
                        concat!(
                            "Error[ksl::builtin::Plugin]: ",
                            "Expected format is `library_name/function_name`, ",
                            "but got `{}`."
                        ),
                        path_str
                    )))
                }
            }
            (Value::Symbol(_), e) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::Plugin]: ",
                    "Expected a String for plugin path, ",
                    "but got `{}`."
                ),
                e
            ))),
            (e, _) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::Plugin]: ",
                    "Expected a Symbol for function name, ",
                    "but got `{}`."
                ),
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Plugin]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}