74 lines
2.7 KiB
Racket
74 lines
2.7 KiB
Racket
#lang scheme/base
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(provide valid-version? version->list version<? version<=? alpha-version?
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version->integer)
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(define rx:version
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;; (this restricts the last component to be below 999 too, which is
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;; not really proper according to the spec in schvers.h)
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(pregexp (string-append "^(0|[1-9][0-9]*)[.]"
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"(0|(0|[1-9][0-9]{0,1})([.](0|[1-9][0-9]{0,2})){0,2}"
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"(?<![.]0))$")))
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(define (valid-version? s)
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(and (string? s) (regexp-match? rx:version s)))
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;; the following functions assume valid version string inputs
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;; returns a list of 4 integers (see src/mzscheme/src/schvers.h)
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(define (version->list str)
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(let ([ver (map string->number (regexp-split #rx"[.]" str))])
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(case (length ver)
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[(2) (append ver '(0 0))]
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[(3) (append ver '(0))]
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[(4) ver]
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[else (error 'version->list "bad version: ~e" str)])))
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(define (version<? a b)
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(let loop ([a (version->list a)]
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[b (version->list b)])
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(cond [(null? a) #f]
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[(< (car a) (car b)) #t]
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[(> (car a) (car b)) #f]
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[else (loop (cdr a) (cdr b))])))
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(define (version<=? a b)
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(or (equal? a b) (version<? a b)))
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(define (alpha-version? v)
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(let ([l (version->list v)])
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(or ((list-ref l 1) . >= . 90)
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((list-ref l 2) . >= . 900)
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((list-ref l 3) . >= . 900))))
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;; returns an integer representing the version (XXYYZZZWWW) or #f if invalid
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;; works for pre v4 versions too
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(define (version->integer ver)
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(define m
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(regexp-match-positions #rx"^(?:0|[1-9][0-9]*)" ver)) ; takes all digits
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;; translate old versions to new-style versions
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(define n (and m (string->number (substring ver 0 (cdar m)))))
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(define v
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(cond [(not n) #f]
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;; new versions
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[(< n 49) ver]
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;; old versions (earliest useful is 49, changed at 3.99)
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[(<= 49 n 379)
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(let*-values
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([(q r) (quotient/remainder n 100)]
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[(sfx) (substring ver (cdar m))]
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[(sfx) (cond [(equal? sfx "") ""]
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;; NNNpN -> N.NN.N
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[(regexp-match? #rx"^p[0-9]" sfx)
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(string-append "." (substring sfx 1))]
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;; NNN.N -> N.NN.0.N (not a release version)
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[(regexp-match? #rx"^[.]" sfx)
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(string-append ".0" sfx)]
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[else #f])])
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(and sfx (format "~a.~a~a" q r sfx)))]
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;; bad strings
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[else #f]))
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(and v (valid-version? v)
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(foldl (lambda (ver mul acc) (+ ver (* mul acc))) 0
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(version->list v) '(0 100 1000 1000))))
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