ksl 0.1.30

KSL core library and interpreter
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

//! # ksl::builtin::eq
//!
//! Built-in function `Eq`.

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

pub(crate) fn builtin(args: &[Value], env: Environment) -> Result<Value, std::sync::Arc<str>> {
    if let [v1, v2] = args {
        Ok(if eval_apply(v1, env.clone())? == eval_apply(v2, env)? {
            TRUE_SYMBOL.clone()
        } else {
            FALSE_SYMBOL.clone()
        })
    } else {
        Err(std::sync::Arc::from(format!(
            concat!(
                "Error[ksl::builtin::Eq]: ",
                "Expected 2 parameters, but {} were passed."
            ),
            args.len()
        )))
    }
}