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Fix scientific number format for subnormal values

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Found while testing crates/model/src/numfmt.rs:204-211 (sci)

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
NetterSilver
2026-10-21 03:34:30 +00:00
co-authored by Claude Haiku 5.5
parent a31b990d32
commit 72a9e4456e
1 changed files with 12 additions and 1 deletions
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crates/model/src/numfmt.rs
+12 -1
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@@ -204,7 +204,12 @@ fn sci(toks: &[Tok], v: f64, sep: char, dec: char) -> Option<String> {
let (mut m, mut exp) = (0.0, 0i32);
if v != 0.0 {
exp = v.log10().floor() as i32;
m = v / 10f64.powi(exp);
m = if exp < -300 {
// 10^exp underflows for subnormals; scale in two steps.
v * 1e300 / 10f64.powi(exp + 300)
} else {
v / 10f64.powi(exp)
};
if !m.is_finite() {
m = 0.0;
exp = 0;
@@ -286,6 +291,12 @@ mod tests {
const RUB: &str = r#"_-* #\ ##0\ "₽"_-;\-* #\ ##0\ "₽"_-;_-* "-"??\ "₽"_-;_-@_-"#;
#[test]
fn scientific_subnormal() {
assert_eq!(format("0.00E+00", 5e-324, None), "4.94E-324");
assert_eq!(format("0.00E+00", f64::MIN_POSITIVE, None), "2.23E-308");
}
#[test]
fn russian_accounting_roubles() {
assert_eq!(format(RUB, 800_000.0, Some("ru-RU")), "800\u{a0}000 ₽");