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Pool collators in LS #1582

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Pool collators in LS #1582

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Pool collators in LS
jakebailey Aug 14, 2025
9bd5e97
fmt
jakebailey Aug 14, 2025
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25 changes: 24 additions & 1 deletion internal/ls/completions.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ import (
"github.com/microsoft/typescript-go/internal/scanner"
"github.com/microsoft/typescript-go/internal/stringutil"
"golang.org/x/text/collate"
"golang.org/x/text/language"
)

func (l *LanguageService) ProvideCompletion(
Expand Down Expand Up @@ -2980,6 +2981,25 @@ func getCompletionsSymbolKind(kind ScriptElementKind) lsproto.CompletionItemKind
}
}

var collatorCache collections.SyncMap[language.Tag, *sync.Pool]

func getCollator(tag language.Tag) *collate.Collator {
pool, ok := collatorCache.Load(tag)
if !ok {
pool, _ = collatorCache.LoadOrStore(tag, &sync.Pool{
New: func() any {
return collate.New(tag)
},
})
}
return pool.Get().(*collate.Collator)
}

func putCollator(tag language.Tag, collator *collate.Collator) {
pool, _ := collatorCache.Load(tag)
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Copilot AI Aug 14, 2025

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The putCollator function assumes the pool exists in the cache, but there's no guarantee. If the pool was somehow evicted or never created, this will panic. Add a nil check or use LoadOrStore pattern similar to getCollator.

Suggested change
pool, _ := collatorCache.Load(tag)
pool, _ := collatorCache.LoadOrStore(tag, &sync.Pool{
New: func() any {
return collate.New(tag)
},
})

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Suggested code is wrong because it'll just waste loads and loads of allocs. If I wanted to solve this, I'd just return a done func from get.

pool.Put(collator)
}

// Editors will use the `sortText` and then fall back to `name` for sorting, but leave ties in response order.
// So, it's important that we sort those ties in the order we want them displayed if it matters. We don't
// strictly need to sort by name or SortText here since clients are going to do it anyway, but we have to
Expand All @@ -2989,7 +3009,10 @@ func getCompletionsSymbolKind(kind ScriptElementKind) lsproto.CompletionItemKind
// this made tests really weird, since most fourslash tests don't use the server.
func getCompareCompletionEntries(ctx context.Context) func(entryInSlice *lsproto.CompletionItem, entryToInsert *lsproto.CompletionItem) int {
return func(entryInSlice *lsproto.CompletionItem, entryToInsert *lsproto.CompletionItem) int {
compareStrings := collate.New(core.GetLocale(ctx)).CompareString
locale := core.GetLocale(ctx)
collator := getCollator(locale)
defer putCollator(locale, collator)
compareStrings := collator.CompareString
result := compareStrings(*entryInSlice.SortText, *entryToInsert.SortText)
if result == stringutil.ComparisonEqual {
result = compareStrings(entryInSlice.Label, entryToInsert.Label)
Expand Down
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