[Haskell-cafe] hxt pickling question

[Erik Hesselink]

There's showPickled [0] and unpickleDoc [1], maybe those help?

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,  <briand at 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
>
>
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