fix: Date.prototype.setYear 无参/NaN 不再越界 panic，按 spec 设为 NaN

2026-06-27 21:41:04 +08:00
parent 6a77742dad
commit 86e9d6d1b0
2 changed files with 46 additions and 1 deletions
@@ -734,6 +734,14 @@ pub fn date_get_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
 pub fn date_set_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
    let obj = unsafe { &mut *native_try!(date_this_mut(vm, args)) };
    let ms = get_timestamp(obj);
+    // A missing year argument coerces to NaN; per B.2.4.2 a NaN year sets the date value to
+    // NaN and returns NaN.
+    let arg = if args.len() > 1 { vm.reg(args[1]) } else { JsValue::undefined() };
+    let y_num = oxide_runtime_api::to_number(arg);
+    if y_num.is_nan() {
+        set_timestamp(obj, f64::NAN);
+        return NativeResult::Ok(JsValue::float(f64::NAN));
+    }
    if !ms.is_finite() {
        return NativeResult::Ok(JsValue::float(f64::NAN));
    }
@@ -741,7 +749,7 @@ pub fn date_set_year<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
        Some(d) => d,
        None => return NativeResult::Ok(JsValue::float(f64::NAN)),
    };
-    let y = oxide_runtime_api::to_number(vm.reg(args[1])).trunc() as i32;
+    let y = y_num.trunc() as i32;
    let full_year = if (0..=99).contains(&y) { y + 1900 } else { y };
    let nd = dt.with_year(full_year).unwrap_or(dt);
    let ts = nd.timestamp_millis() as f64;