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Fix category synonym matching: deduplicate aliases, remove broken fast-path

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Three issues in categoryAliasList/categoryMatcher:

1. categoryAliasList appended raw synonyms without deduplication—the
   addAlias helper already handles lowering and dedup, so route synonyms
   through it instead of direct append.

2. categoryMatcher.matches had a fast-path that returned false when the
   input contained no separators (-_ space), skipping the normalization
   step entirely. This caused legitimate matches like "frozen foods" vs
   "frozen" to fail when the input was a simple word that needed plural
   stripping to match.

3. normalizeCategory unconditionally replaced underscores/hyphens and
   re-joined fields even for inputs without separators. Gate the
   separator logic behind a ContainsAny check, and use direct slice
   indexing instead of TrimSuffix for the plural stripping.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Taylor Eernisse
2026-02-23 01:31:50 -05:00
parent 11a90d2fd1
commit 28479071ae
1 changed files with 10 additions and 12 deletions
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16
internal/filter/category_synonyms.go
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@@ -60,7 +60,9 @@ func categoryAliasList(wanted string) []string {
addAlias(group)
if synonyms, ok := categorySynonyms[group]; ok {
out = append(out, synonyms...)
for _, s := range synonyms {
addAlias(s)
}
}
return out
}
@@ -92,12 +94,6 @@ func (m categoryMatcher) matches(category string) bool {
}
}
// Fast path: if no separators are present and direct aliases didn't match,
// normalization would only add overhead for common categories like "grocery".
if !strings.ContainsAny(trimmed, "-_ ") {
return false
}
norm := normalizeCategory(trimmed)
_, ok := m.normalized[norm]
return ok
@@ -108,14 +104,16 @@ func normalizeCategory(raw string) string {
if s == "" {
return ""
}
if strings.ContainsAny(s, "_-") {
s = strings.ReplaceAll(s, "_", " ")
s = strings.ReplaceAll(s, "-", " ")
s = strings.Join(strings.Fields(s), " ")
}
switch {
case len(s) > 4 && strings.HasSuffix(s, "ies"):
s = strings.TrimSuffix(s, "ies") + "y"
s = s[:len(s)-3] + "y"
case len(s) > 3 && strings.HasSuffix(s, "s") && !strings.HasSuffix(s, "ss"):
s = strings.TrimSuffix(s, "s")
s = s[:len(s)-1]
}
return s
}