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fix: Prevent camelCase-to-colname to duplicate underscores (#1287) #1652

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fix: Prevent camelCase-to-colname to duplicate underscores (#1287) #1652

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9 changes: 6 additions & 3 deletions src/utils/quoting.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -85,15 +85,18 @@
"Transform input STRING into a suitable column name.
lahmanID lahman_id
playerID player_id
birthYear birth_year"
birthYear birth_year
Reference_ID reference_id"
(coerce
(loop
:for first := t :then nil
:for char :across string
:for previous-upper-p := nil :then char-upper-p
:for previous-underscore := nil :then underscore
:for underscore := (char= char #\_)
:for char-upper-p := (and (alpha-char-p char)
(eq char (char-upcase char)))
:for new-word := (and (not first) char-upper-p (not previous-upper-p))
:when (and new-word (not (char= char #\_))) :collect #\_
:for new-word := (and (not first) char-upper-p (not previous-upper-p) (not previous-underscore))
:when new-word :collect #\_
:collect (char-downcase char))
'string))