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-rw-r--r--skate/map.go15
1 files changed, 3 insertions, 12 deletions
diff --git a/skate/map.go b/skate/map.go
index 17d9ed2..a6dc5f3 100644
--- a/skate/map.go
+++ b/skate/map.go
@@ -289,22 +289,13 @@ func MapperOpenLibraryReleaseNormalizedISBN(p []byte) (fields [][]byte, err erro
}
// There can be 10 and 13 variants in the data, we always want 13.
for _, isbn := range doc.ExtIDs.ISBN {
- if len(isbn) == 13 {
- isbn13 = isbn
+ parsed := ParseIsbn(isbn)
+ if len(parsed) > 0 {
+ isbn13 = parsed[0]
break
}
}
if isbn13 == "" {
- // This is rarer, more expensive.
- for _, isbn := range doc.ExtIDs.ISBN {
- parsed := ParseIsbn(isbn)
- if len(parsed) > 0 {
- isbn13 = parsed[0]
- break
- }
- }
- }
- if isbn13 == "" {
return nil, nil
} else {
key = []byte(isbn13)