help with recursive whitespace filter in

[rustom]

On May 10, 9:49 pm, Steve Howell <showel... at yahoo.com> wrote:
> On May 10, 9:10 am, Rustom Mody <rustompm... at gmail.com> wrote:
>
>
>
> > I am trying to write a recursive filter to remove whitespace-only
> > nodes for minidom.
> > The code is below.
>
> > Strangely it deletes some whitespace nodes and leaves some.
> > If I keep calling it -- like so: fws(fws(fws(doc)))  then at some
> > stage all the ws nodes disappear
>
> > Does anybody have a clue?
>
> > from xml.dom.minidom import parse
>
> > #The input to fws is the output of parse("something.xml")
>
> > def fws(ele):
> >     """ filter white space (recursive)"""
>
> >    for c in ele.childNodes:
> >         if isWsNode(c):
> >             ele.removeChild(c)
> >             #c.unlink() Makes no diff whether this is there or not
> >         elif c.nodeType == ele.ELEMENT_NODE:
> >             fws(c)
>
> > def isWsNode(ele):
> >     return (ele.nodeType == ele.TEXT_NODE and not ele.data.strip())
>
> I would avoid doing things like delete/remove in a loop.  Instead
> build a list of things to delete.

Yeah I know. I would write the whole damn thing functionally if I knew
how.  But cant figure out the API.
I actually started out to write a (haskell-style) copy out the whole
tree minus the unwanted nodes but could not figure it out