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extern crate meval;

fn trim_parenthesis(arg: &str) -> &str { arg.trim_start_matches('(').trim_end_matches(')') }

pub fn maybe_trim_parenthesis(arg: &str) -> &str {
    if arg.starts_with('(') && arg.ends_with(')') {
        trim_parenthesis(arg)
    } else {
        arg
    }
}

pub fn eval_f64(expr: &str) -> Result<f64, meval::Error> { meval::eval_str(expr) }