cljrs-runtime 0.2.21

clojurust runtime: environment, builtins, tree-walking interpreter, and tiered evaluation
Documentation 
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use cljrs_reader::Parser;
use cljrs_runtime::env::env::Env;
use cljrs_runtime::env::error::EvalError;
use cljrs_value::Value;

fn form(src: &str) -> cljrs_reader::Form {
    Parser::new(src.to_owned(), "<gas-test>".to_owned())
        .parse_all()
        .expect("parse")
        .remove(0)
}

fn env() -> Env {
    Env::new(
        cljrs_runtime::Runtime::builder()
            .execution_mode(cljrs_runtime::ExecutionMode::TreeWalk)
            .eager_clojure_test(true)
            .build()
            .expect("runtime")
            .into_globals(),
        "user",
    )
}

#[test]
fn ordinary_eval_is_unmetered() {
    assert_eq!(
        cljrs_runtime::interp::eval::eval(&form("(+ 1 2)"), &mut env()).unwrap(),
        Value::Long(3)
    );
}

#[test]
fn zero_credits_exhaust_before_evaluation() {
    assert!(matches!(
        cljrs_runtime::interp::eval::eval_with_gas(&form("1"), &mut env(), 0),
        Err(EvalError::GasExhausted)
    ));
}

#[test]
fn recursive_work_exhausts_and_cannot_be_caught() {
    let source = "(try (loop* [x 0] (recur (inc x))) (catch :default e :caught))";
    assert!(matches!(
        cljrs_runtime::interp::eval::eval_with_gas(&form(source), &mut env(), 40),
        Err(EvalError::GasExhausted)
    ));
}