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correctly handle multiple registrations of the same snipclass name

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svn: r15692
This commit is contained in:
Matthew Flatt 2009-08-09 13:48:09 +00:00
parent a090aa60a9
commit 3170f05da2
1 changed files with 9 additions and 5 deletions
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14
collects/mred/private/wxme/snip.ss
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@ -1238,11 +1238,15 @@
(def/public (add [snip-class% c])
(let ([name (send c get-classname)])
(hash-set! ht name c)
(let ([n (hash-count pos-ht)])
(hash-set! pos-ht c n)
(hash-set! rev-pos-ht n c))))
(let ([old (hash-ref ht name #f)])
(hash-set! ht name c)
(let ([n (if old
(hash-ref pos-ht old)
(hash-count pos-ht))])
(when old (hash-remove! pos-ht old))
(hash-set! pos-ht c n)
(hash-set! rev-pos-ht n c)))))
(def/public (number) (hash-count ht))
(def/public (nth [exact-nonnegative-integer? n]) (hash-ref rev-pos-ht n #f)))