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Merged
merged 2 commits into from
Jan 27, 2024
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Improve handling of numbers in IntoDiagnosticArg #120398

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304361a
Improve handling of numbers in IntoDiagnosticArg
Urgau Jan 26, 2024
93ff4a4
Fix typo
Urgau Jan 26, 2024
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47 changes: 22 additions & 25 deletions compiler/rustc_errors/src/diagnostic_impls.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -58,16 +58,29 @@ macro_rules! into_diagnostic_arg_using_display {
}
}

macro_rules! into_diagnostic_arg_for_number {
($( $ty:ty ),+ $(,)?) => {
$(
impl IntoDiagnosticArg for $ty {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
// HACK: `FluentNumber` the underline backing struct represent
// numbers using a f64 which can represent all the i128 numbers
// So in order to be able to use fluent selectors and still
// have all the numbers representable we only convert numbers
// below a certain threshold.
if let Ok(n) = TryInto::<i128>::try_into(self) && n >= -100 && n <= 100 {
DiagnosticArgValue::Number(n)
} else {
self.to_string().into_diagnostic_arg()
}
Comment on lines +71 to +75
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Hm, this seems quite confusing. If someone is matching on different numbers, say 0, 1, 100, and 1000, then the latter one will be different, which is pretty inconsistent.

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I think it's a necessary compromise given the usage of f64 in FluentNumber. In reality, you're probably using one of the CLDR numerical selectors, rather than the number directly.

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I agree. I thought of using a more complicated system which would take into account f64 maximum representable base-10 number but I think it's overkill.

The reason I wanted to match on the numbers was to change the sentence in the 1 case, and it will be the case of many other peoples and I think that in many languages phrases with numbers generally only care about 0, 1, >1. So to be safe I choose 100 as a low but consistent and predictable number.

}
}
)+
}
}

into_diagnostic_arg_using_display!(
ast::ParamKindOrd,
i8,
u8,
i16,
u16,
u32,
i64,
i128,
u128,
std::io::Error,
Box<dyn std::error::Error>,
std::num::NonZeroU32,
Expand All @@ -82,17 +95,7 @@ into_diagnostic_arg_using_display!(
ExitStatus,
);

impl IntoDiagnosticArg for i32 {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
DiagnosticArgValue::Number(self.into())
}
}

impl IntoDiagnosticArg for u64 {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
DiagnosticArgValue::Number(self.into())
}
}
into_diagnostic_arg_for_number!(i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize, usize);

impl IntoDiagnosticArg for bool {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
Expand Down Expand Up @@ -154,12 +157,6 @@ impl IntoDiagnosticArg for PathBuf {
}
}

impl IntoDiagnosticArg for usize {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
DiagnosticArgValue::Number(self as i128)
}
}

impl IntoDiagnosticArg for PanicStrategy {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
DiagnosticArgValue::Str(Cow::Owned(self.desc().to_string()))
Expand Down