ksl 0.1.30

KSL core library and interpreter
Documentation 
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//! # ksl::builtin::string_case
//!
//! Built-in function `Uppercase` and `Lowercase`.

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

pub(crate) fn builtin(args: &[Value], is_upper: bool, env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [val] = args {
        match eval_apply(val, env)? {
            Value::String(s) => Ok(Value::String(std::sync::Arc::from(if is_upper {
                s.to_uppercase()
            } else {
                s.to_lowercase()
            }))),
            e => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::{}]: ",
                    "Expected a string, but got: `{}`."
                ),
                if is_upper { "Uppercase" } else { "Lowercase" },
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::{}]: ",
                "Expected 1 parameter, but {} were passed."
            ),
            if is_upper { "Uppercase" } else { "Lowercase" },
            args.len()
        )))
    }
}