On Thu, 24 Jan 2013 17:05:15 +0100 Erik Hesselink <hessel...@gmail.com> wrote:
> There's showPickled [0] and unpickleDoc [1], maybe those help? > Thank you , they help a lot :-) I was stuck looking in Text.XML.HXT.Arrow.Pickle for the answer and got lost trying to decipher IOStateArrow s a XmlTree and runX. It's odd that there does not seem to be a way to use the example so that a tree can be written directly to a file. xpickleDocument :: PU a -> SysConfigList -> String -> IOStateArrow s a XmlTreeSource store an arbitray value in a persistent XML document Except there doesn't seem to be a way to pass that value into xpickleDocument without reading a document first using xunpickleDocument. Thanks again. Brian > Erik > > [0] > http://hackage.haskell.org/packages/archive/hxt/latest/doc/html/Text-XML-HXT-Arrow-Pickle-Xml.html#v:showPickled > [1] > http://hackage.haskell.org/packages/archive/hxt/latest/doc/html/Text-XML-HXT-Arrow-Pickle-Xml.html#v:unpickleDoc > > On Thu, Jan 24, 2013 at 4:40 PM, <bri...@aracnet.com> wrote: > > Hi, > > > > Trying to understand how to write a document using a pickler but I can't > > make sense of the types. > > > > From the example: > > > > runX ( xunpickleDocument xpSeason > > [ withValidate no > > , withTrace 1 > > , withRemoveWS yes > > , withPreserveComment no > > ] "simple2.xml" > > >>> > > processSeason > > >>> > > xpickleDocument xpSeason > > [ withIndent yes > > ] "new-simple2.xml" > > ) > > > > So all I want to do is pickle a value directly instead of reading the value > > from a document. I expected to do something like: > > > > runX (someHXTPicklingFunction myValue > > >>> > > xpickleDocument ...) > > > > > > but I can't seem to figure out what someHXTPicklingFunction should be, it's > > certainly nothing obvious like pickleDoc, because that generates the wrong > > value. > > > > Seems like I probably have a much more fundamental problem in that I really > > don't understand how the arrow part of this little example really works, > > but I was kind of hoping that doing something "simple" like this might shed > > some light on that. And then was immediately stuck in type hell. > > > > > > Thanks, > > > > Brian > > > > > > _______________________________________________ > > Haskell-Cafe mailing list > > Haskell-Cafe@haskell.org > > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
