Help needed with Data.Version

Krasimir Angelov kr.angelov at gmail.com
Wed Mar 23 10:19:22 EST 2005


What I need is to have simple function of type (String -> Version).
How I can do that with the current implementataion?


On Wed, 23 Mar 2005 15:16:09 +0000, Ross Paterson <ross at soi.city.ac.uk> wrote:
> On Wed, Mar 23, 2005 at 02:55:47PM +0000, Krasimir Angelov wrote:
> > I have found a bug in Data.Version. The expression:
> >
> > readP_to_S parseVersion "1.0"
> >
> > produces:
> >
> > [(Version {versionBranch = [1], versionTags = []},".0"),(Version
> > {versionBranch= [1,0], versionTags = []},"")]
> >
> > With other words the parser is ambiguous.
> 
> It's no more ambiguous than
> 
> readP_to_S (many1 (satisfy isDigit)) "1234"
> [("1","234"),("12","34"),("123","4"),("1234","")]
> 
> It just needs to be used in context.
>


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