rhai/tests/bit_fields.rs

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use rhai::{Engine, EvalAltResult, INT};
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#[test]
fn test_left_shift() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(engine.eval::<INT>("4 << 2")?, 16);
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Ok(())
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}
#[test]
fn test_right_shift() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert_eq!(engine.eval::<INT>("9 >> 1")?, 4);
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Ok(())
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}
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#[cfg(not(feature = "no_index"))]
#[test]
fn test_bit_fields() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
assert!(!engine.eval::<bool>("let x = 10; x[0]")?);
assert!(engine.eval::<bool>("let x = 10; x[1]")?);
assert!(!engine.eval::<bool>("let x = 10; x[-1]")?);
assert_eq!(
engine.eval::<INT>("let x = 10; x[0] = true; x[1] = false; x")?,
9
);
assert_eq!(engine.eval::<INT>("let x = 10; get_bits(x, 1, 3)")?, 5);
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assert_eq!(engine.eval::<INT>("let x = 10; x[1..=3]")?, 5);
assert!(engine.eval::<INT>("let x = 10; x[1..99]").is_err());
assert!(engine.eval::<INT>("let x = 10; x[-1..3]").is_err());
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assert_eq!(
engine.eval::<INT>("let x = 10; set_bits(x, 1, 3, 7); x")?,
14
);
#[cfg(target_pointer_width = "64")]
{
assert_eq!(engine.eval::<INT>("let x = 255; get_bits(x, -60, 2)")?, 3);
assert_eq!(
engine.eval::<INT>("let x = 0; set_bits(x, -64, 1, 15); x")?,
1
);
assert_eq!(
engine.eval::<INT>("let x = 0; set_bits(x, -60, 2, 15); x")?,
0b00110000
);
}
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assert_eq!(engine.eval::<INT>("let x = 10; x[1..4] = 7; x")?, 14);
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assert_eq!(
engine.eval::<INT>(
"
let x = 0b001101101010001;
let count = 0;
for b in bits(x, 2, 10) {
if b { count += 1; }
}
count
"
)?,
5
);
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assert_eq!(
engine.eval::<INT>(
"
let x = 0b001101101010001;
let count = 0;
for b in bits(x, 2..=11) {
if b { count += 1; }
}
count
"
)?,
5
);
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Ok(())
}