ksl 0.1.30

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

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

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [val, delimiter] = args {
        match (eval_apply(val, env.clone())?, eval_apply(delimiter, env)?) {
            (Value::String(s), Value::String(d)) => {
                let pat = try_regex_cache(&d)?;

                Ok(Value::List(
                    pat.split(&s)
                        .filter(|sub| !sub.is_empty())
                        .map(|sub| Value::String(std::sync::Arc::from(sub)))
                        .collect::<std::sync::Arc<[Value]>>(),
                ))
            }
            (Value::String(_), e) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::SplitBy]: ",
                    "Expected a string as delimiter, but got: `{}`."
                ),
                e
            ))),
            (e, _) => Err(std::sync::Arc::from(format!(
                concat!(
                    "Error[ksl::builtin::SplitBy]: ",
                    "Expected a string, but got: `{}`."
                ),
                e
            ))),
        }
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::SplitBy]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}