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Support negative index counting from end.

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This commit is contained in:
Stephen Chung
2021-04-10 15:00:03 +08:00
parent 716e9cf779
commit 40fda5139d
9 changed files with 273 additions and 83 deletions
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2
tests/arrays.rs
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@@ -12,6 +12,8 @@ fn test_arrays() -> Result<(), Box<EvalAltResult>> {
engine.eval::<char>(r#"let y = [1, [ 42, 88, "93" ], 3]; y[1][2][1]"#)?,
'3'
);
assert_eq!(engine.eval::<INT>("let y = [1, 2, 3]; y[0]")?, 1);
assert_eq!(engine.eval::<INT>("let y = [1, 2, 3]; y[-1]")?, 3);
assert!(engine.eval::<bool>("let y = [1, 2, 3]; 2 in y")?);
assert_eq!(engine.eval::<INT>("let y = [1, 2, 3]; y += 4; y[3]")?, 4);