ksl 0.1.30

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

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

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    // ToString
    if let [value] = args {
        Ok(match eval_apply(value, env)? {
            s @ Value::String(_) => s,
            v => Value::String(std::sync::Arc::from(v.to_string())),
        })
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::ToString]: ",
                "Expected 1 parameter, but {} were passed."
            ),
            args.len()
        )))
    }
}