ksl 0.1.30

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

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 [sec] = args {
        match eval_apply(sec, env)? {
            Value::Number(n) if n >= 0.0 => {
                std::thread::sleep(std::time::Duration::from_secs_f64(n));
                Ok(Value::Unit)
            }
            Value::Number(_) => Err(std::sync::Arc::from(concat!(
                "Error[ksl::builtin::Sleep]: ",
                "Sleep time must be a non-negative number."
            ))),
            e => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::Sleep]: ",
                    "Expect a non-negative number, but got: `{}`."
                ),
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Sleep]: ",
                "Expected 1 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}