On Monday 19 January 2004 11:23, Graham Fawcett wrote:
> A quick comment on the 'node tree' idea...
>
> Oscar Rambla wrote:
> >>Well, if we can maintain the tree structure, and if you have access to
> >>each node's name, attributes and children, then you should be able to
> >>transform the tree. If I needed to do a lot of this kind of thing, I
> >>would probably use another tool, but perhaps there are some simple,
> >>common cases that we should facilitate. Some use-cases would be helpful.
> >>I would hesitate to do /too/ much of this, or we will begin to
> >>reinvent existing XML technologies.
> >
> > I didn't pretend you to do it , in any way. Maintain the tree structure
> > would be enough for me. If I needed to do a lot of things I could
> > translate it to a well-proven XML tool. Sorry but I don't see the way to
> > maintain it with the current version.
>

Sorry again! I should have play a bit with your code before thinking.
I had just realized of it. It's wonderful!

> Here's a quick example. You can tell from the code that I did not design
> it for easy tree manipulations -- but it is possible!
>
>
>      # given a list of four LI elements,
>      # insert a new element at the second position, and
>      # remove the "dummy" elements
>
>      from nevow import *
>
>      mylist = ul[
>                  li['first point'],
>                  li['last point'],
>                  li(id='dummy1')['dummy point 1'],
>                  li(id='dummy2')['dummy point 2'],
>      ]
>
>      mylist.content.lst.insert(1, li['inserted point'])
>
>      for item in mylist.content.lst[:]:
>          if item.attribs.get('id', '').startswith('dummy'):
>              mylist.content.lst.remove(item)
>
>      print mylist
>
>
> which prints (without the newlines):
>
>      

>      
first point
>      
inserted point
>      
last point
>      
>
> With a little work we could clean this up, and it could look like:
>
>
>      mylist.children.insert(1, li['inserted point'])
>
>      for item in mylist.children[:]:
>          if item.attribs.get('id', '').startswith('dummy'):
>              mylist.children.remove(item)
>
>
> which is a bit more DOM-like.
>

With the clean up even better. Need hands?

> * * * * * *
>
> By the way, there is a tiny error in my nevow.py file. I assume that
> those of you who tried it found the bug and fixed it yourselves. If you
> get an error like:
>
>        File "", line 1
>          = Tag("")
>          ^
>      SyntaxError: invalid syntax
>
> add the following lines:
>
>      for tagname in tagnames.split(' '):
> +       if tagname:
> ....        cmd = '%s = Tag("%s")' % (tagname, tagname)
> ....        exec cmd
>
> or strip out the extra space at the end of the 'tagnames' variable.

Checked.

Thank you.

Oscar Rambla
CODI
tecnic@codidoc.com