There are situations where standard ASCII sorting does not suffice. This egg implements procedures for natural sorting as described on Coding Horror and the linked resources.
- number-re REparameter
Parameter holding an irregex-compatible regular expression used to find a number. Defaults to (+ num), a sequence of at least one numerical digit.
- natural-sort-preprocessor PROCparameter
Parameter holding a preprocessing procedure that adjusts an input string before comparing it to another string. Defaults to identity to leave its input unchanged.
- natural-string<? STRING1 STRING2procedure
- natural-string<=? STRING1 STRING2procedure
- natural-string=? STRING1 STRING2procedure
- natural-string<>? STRING1 STRING2procedure
- natural-string>? STRING1 STRING2procedure
- natural-string>=? STRING1 STRING2procedure
Predicates for comparing two strings according to natural sort order.
- natural-string-compare STRING1 STRING2procedure
Compares two strings according to natural sort order and returns -1 if STRING1 is smaller than STRING2, 0 if STRING1 is equal to STRING2 and 1 if STRING1 is greater than STRING2.
- natural-sort STRINGSprocedure
Convenience procedure for performing a natural sort on a list of strings. It is equivalent to (sort natural-string<? STRINGS).
(use natural-sort) (define (random-ipv4-address) (format "~a.~a.~a.~a" (random 256) (random 256) (random 256) (random 256))) (for-each print (natural-sort (list-tabulate 10 (lambda (_) (random-ipv4-address))))) ;; 22.214.171.124 ;; 126.96.36.199 ;; 188.8.131.52 ;; 184.108.40.206 ;; 220.127.116.11 ;; 18.104.22.168 ;; 22.214.171.124 ;; 126.96.36.199 ;; 250.72.30.164 ;; 250.132.51.35
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- Initial release