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Re: remove XML tags using Text.Regex.Posix (Magnus Therning) ---------------------------------------------------------------------- Message: 1 Date: Tue, 29 Sep 2009 10:30:44 +0100 From: Magnus Therning <mag...@therning.org> Subject: Re: [Haskell-beginners] Distributing executables To: Lyndon Maydwell <maydw...@gmail.com> Cc: beginners@haskell.org Message-ID: <e040b520909290230w76977dedj3de0c8b3781a6...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 On Tue, Sep 29, 2009 at 10:19 AM, Lyndon Maydwell <maydw...@gmail.com> wrote: > No love for OS X? No, not from me personally ;-) Seriously, I simply don't know anything about OSX. I've never owned a McComputer. Though I suspect OSX isn't quite as broken as Windows in relation to installers. /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnusï¼ therningï¼org Jabber: magnusï¼ therningï¼org http://therning.org/magnus identi.ca|twitter: magthe ------------------------------ Message: 2 Date: Tue, 29 Sep 2009 10:32:52 +0100 From: Magnus Therning <mag...@therning.org> Subject: Re: [Haskell-beginners] Distributing executables To: Alp Mestan <a...@mestan.fr> Cc: beginners@haskell.org Message-ID: <e040b520909290232u2d841050qe0a712518eece...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 On Tue, Sep 29, 2009 at 10:29 AM, Alp Mestan <a...@mestan.fr> wrote: > On Tue, Sep 29, 2009 at 11:19 AM, Lyndon Maydwell <maydw...@gmail.com> > wrote: >> >> No love for OS X? > > No knowledge of OS X binary/library interactions, actually :-) > > Magnus : I agree about Linux. At least, a cabal package is enough, since > there are a lot of cabal-to-<insert distro package format here> tools > around. For Windows, which tool do you know that'd make it for Haskell apps > ? I don't know of any Haskell-specific ones, but I'd be surprised if you can't make NSIS or WiX create an installer for a Haskell binary. /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnusï¼ therningï¼org Jabber: magnusï¼ therningï¼org http://therning.org/magnus identi.ca|twitter: magthe ------------------------------ Message: 3 Date: Tue, 29 Sep 2009 17:35:28 +0800 From: Lyndon Maydwell <maydw...@gmail.com> Subject: Re: [Haskell-beginners] Distributing executables To: Magnus Therning <mag...@therning.org> Cc: beginners@haskell.org Message-ID: <da8fea9e0909290235g3c726338v1a250a4f2ade9...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8 I was thinking more along the lines of how reasonable it would be to ask a non-technical user to build a program you wish to distribute from source. On linux / bsd /etc it would probably be unsurprising, but it may be asking too much of windows and mac users. On Tue, Sep 29, 2009 at 5:30 PM, Magnus Therning <mag...@therning.org> wrote: > On Tue, Sep 29, 2009 at 10:19 AM, Lyndon Maydwell <maydw...@gmail.com> wrote: >> No love for OS X? > > No, not from me personally ;-) > > Seriously, I simply don't know anything about OSX.  I've never owned a > McComputer.  Though I suspect OSX isn't quite as broken as Windows in > relation to installers. > > /M > > -- > Magnus Therning             (OpenPGP: 0xAB4DFBA4) > magnusï¼ therningï¼org      Jabber: magnusï¼ therningï¼org > http://therning.org/magnus     identi.ca|twitter: magthe > ------------------------------ Message: 4 Date: Tue, 29 Sep 2009 18:02:40 +0100 From: Colin Paul Adams <co...@colina.demon.co.uk> Subject: [Haskell-beginners] Can you identify this recursion pattern please? To: beginners@haskell.org Message-ID: <m34oql7kgf....@colina.demon.co.uk> Content-Type: text/plain; charset=us-ascii This looks like some kind of unfold to me. Can you help? I have the following code that works for the first two levels: -- get the list of all (recursive) child gallery names -- first, just the immediate children childNames <- childGalleries db (name gallery) -- now let's try the next level grandchildren <- mapM (childGalleries db) childNames mapM putStrLn (childNames ++ concat grandchildren) The database query childGalleries gives me a list of all the immediate children. So what I want is recursively, the names of all the descendants, as well as the original name, concatenated to a flat list. I'm struggling to identify the higher-order recursion function I need. -- Colin Adams Preston Lancashire ------------------------------ Message: 5 Date: Tue, 29 Sep 2009 19:51:23 +0100 From: Colin Paul Adams <co...@colina.demon.co.uk> Subject: Re: [Haskell-beginners] Can you identify this recursion pattern please? To: beginners@haskell.org Message-ID: <m3zl8d60us....@colina.demon.co.uk> Content-Type: text/plain; charset=us-ascii >>>>> "Colin" == Colin Paul Adams <co...@colina.demon.co.uk> writes: Colin> The database query childGalleries gives me a list of all Colin> the immediate children. So what I want is recursively, the Colin> names of all the descendants, as well as the original name, Colin> concatenated to a flat list. I'm struggling to identify the Colin> higher-order recursion function I need. I worked out that Data.Tree.unfoldM_BF was what I needed. -- Colin Adams Preston Lancashire ------------------------------ Message: 6 Date: Tue, 29 Sep 2009 12:25:07 -0700 From: Robert Ziemba <rzie...@gmail.com> Subject: [Haskell-beginners] remove XML tags using Text.Regex.Posix To: beginners@haskell.org Message-ID: <65135790909291225ge73308emb0891250638c5...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" I have been working with the regular expression package (Text.Regex.Posix). My hope was to find a simple way to remove a pair of XML tags from a short string. I have something like this "<tag>Data</tag>" and would like to extract 'Data'. There is only one tag pair, no nesting, and I know exactly what the tag is. My first attempt was this: "<tag>123</tag>" =~ "[^<tag>].+[^</tag>]"::String result: "123" Upon further experimenting I realized that it only works with more than 2 digits in 'Data'. I occured to me that my thinking on how this regular expression works was not correct - but I don't understand why it works at all for 3 or more digits. Can anyone help me understand this result and perhaps suggest another strategy? Thank you. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.haskell.org/pipermail/beginners/attachments/20090929/77d2a447/attachment-0001.html ------------------------------ Message: 7 Date: Tue, 29 Sep 2009 20:33:51 +0100 From: Colin Paul Adams <co...@colina.demon.co.uk> Subject: Re: [Haskell-beginners] remove XML tags using Text.Regex.Posix To: Robert Ziemba <rzie...@gmail.com> Cc: beginners@haskell.org Message-ID: <m3vdj15yw0....@colina.demon.co.uk> Content-Type: text/plain; charset=us-ascii >>>>> "Robert" == Robert Ziemba <rzie...@gmail.com> writes: Robert> Can anyone help me understand this result and perhaps Robert> suggest another strategy? I can manage the latter - use an XML parser to extract the text. -- Colin Adams Preston Lancashire ------------------------------ Message: 8 Date: Tue, 29 Sep 2009 16:29:52 -0400 From: Patrick LeBoutillier <patrick.leboutill...@gmail.com> Subject: Re: [Haskell-beginners] remove XML tags using Text.Regex.Posix To: Robert Ziemba <rzie...@gmail.com> Cc: beginners@haskell.org Message-ID: <b217a64f0909291329x8020420jb41afe651c0c6...@mail.gmail.com> Content-Type: text/plain; charset="iso-8859-1" Robert, On Tue, Sep 29, 2009 at 3:25 PM, Robert Ziemba <rzie...@gmail.com> wrote: > I have been working with the regular expression package (Text.Regex.Posix). > My hope was to find a simple way to remove a pair of XML tags from a short > string. > > I have something like this "<tag>Data</tag>" and would like to extract > 'Data'. There is only one tag pair, no nesting, and I know exactly what the > tag is. > > My first attempt was this: > > "<tag>123</tag>" =~ "[^<tag>].+[^</tag>]"::String > > result: "123" > > Upon further experimenting I realized that it only works with more than 2 > digits in 'Data'. I occured to me that my thinking on how this regular > expression works was not correct - but I don't understand why it works at > all for 3 or more digits. > > Can anyone help me understand this result and perhaps suggest another > strategy? Thank you. > The regex you are using here can be described as such: "Match a character not in the set '<,t,a,g,>', followed by 1 or more of anything, followed by a character not in the set '<,/,t,a,g,>'." Effectively, it will not match if your data has less than 3 characters and is probably not the correct regex for this job, i.e. it would also match "x123x". What you need is regex capturing, but I don't know if that is available in that regex library (I'm not an expert Haskeller). If you really need a regex to locate the tag, you could use a function like this to extract it: getTagData tag s = let match = s =~ ("<" ++ tag ++ ">.*</" ++ tag ++ ">")::String dropTag = drop (length tag + 2) s getData = take (length match - (2 * length tag + 5)) dropTag in if length match > 0 then Just getData else Nothing *Main> getTagData "tag" "<tag>123</tag>" Just "123" Patrick > _______________________________________________ > Beginners mailing list > Beginners@haskell.org > http://www.haskell.org/mailman/listinfo/beginners > > -- ===================== Patrick LeBoutillier Rosemère, Québec, Canada -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.haskell.org/pipermail/beginners/attachments/20090929/46415b74/attachment-0001.html ------------------------------ Message: 9 Date: Wed, 30 Sep 2009 06:58:35 +0100 From: Magnus Therning <mag...@therning.org> Subject: Re: [Haskell-beginners] remove XML tags using Text.Regex.Posix To: beginners@haskell.org Message-ID: <20090930055835.gb3...@tatooine> Content-Type: text/plain; charset="utf-8" On Tue, Sep 29, 2009 at 12:25:07PM -0700, Robert Ziemba wrote: > I have been working with the regular expression package (Text.Regex.Posix). > My hope was to find a simple way to remove a pair of XML tags from a short > string. > > I have something like this "<tag>Data</tag>" and would like to extract > 'Data'. There is only one tag pair, no nesting, and I know exactly what the > tag is. > > My first attempt was this: > > "<tag>123</tag>" =~ "[^<tag>].+[^</tag>]"::String > > result: "123" > > Upon further experimenting I realized that it only works with more than 2 > digits in 'Data'. I occured to me that my thinking on how this regular > expression works was not correct - but I don't understand why it works at > all for 3 or more digits. > > Can anyone help me understand this result and perhaps suggest another > strategy? Thank you. Personally I would have used tagsoup for this sort of thing. Keep in mind the eternal words Some people, when confronted with a problem, think 'I know, I'll use regular expressions.' Now they have two problems. -- Jamie Zawinski As you so nicely demonstrated yourself ;-) /M -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnusï¼ therningï¼org Jabber: magnusï¼ therningï¼org http://therning.org/magnus identi.ca|twitter: magthe -------------- next part -------------- A non-text attachment was scrubbed... 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