4785e86907
* Added `version<=?' and `alpha-version?' * updated checker for new file location, update code svn: r10224
40 lines
1.3 KiB
Scheme
40 lines
1.3 KiB
Scheme
#lang scheme/base
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(provide valid-version? version->list version<? version<=? alpha-version?)
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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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;; 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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;; the following functions assume valid version string inputs
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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) ((list-ref l 2) . >= . 900))))
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