Natively handle negative numbers in tokenizer instead of the neg() function.

2020-03-09 10:10:19 +08:00
parent c5b40783ef
commit 01d04f717b
3 changed files with 46 additions and 24 deletions
--- a/tests/unary_minus.rs
+++ b/tests/unary_minus.rs
@@ -5,8 +5,8 @@ fn test_unary_minus() -> Result<(), EvalAltResult> {
    let mut engine = Engine::new();

    assert_eq!(engine.eval::<i64>("let x = -5; x")?, -5);
-    assert_eq!(engine.eval::<i64>("fn n(x) { -x } n(5)")?, -5);
-    assert_eq!(engine.eval::<i64>("5 - -(-5)")?, 0);
+    assert_eq!(engine.eval::<i64>("fn neg(x) { -x } neg(5)")?, -5);
+    assert_eq!(engine.eval::<i64>("5 - -+++--+-5")?, 0);

    Ok(())
 }