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Thread: Namespace problems with py:if
Namespace problems with py:if
country flaguser name
United States		 2007-03-23 06:35:22 
Hi,

I'm new to genshi, and have problems with using namespaces
together
with py:if. Here's an example:

from genshi.template import MarkupTemplate
from genshi import *

tmpl = """<?xml
version="1.0"?>
<Test xmlns:py="http://genshi.e
dgewall.org/">
<Size py:if="size"
xmlns="test:test">size</Size>
<Item/>
</Test>"""

t = MarkupTemplate(tmpl)
s = t.generate(size=1)
print s.render()

This code produces the following output:

<Test>
<Size xmlns="test:test">size</Size>
<Item/>
</Test>

But if you set size=0 with generate, the output is now:

<Test>

<Item xmlns="test:test"/>
</Test>

Looks like a bug to me. I was expecting something like
this:

<Test>

<Item/>
</Test>

Tried with both '0.3.6' and '0.4dev-r525'

-- Dag


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Re: Namespace problems with py:if
country flaguser name
United States		 2007-03-28 01:22:36 

Karl Guertin wrote:
> The declaration is somewhat strange. It's setting the
default
> namespace of <Size> to "test:test". Not
sure if that was intended or
> xmlns:test="test" was intended. Wouldn't be
an issue in real use but
> attributes jumping to siblings is not good regardless.

Hi, sorry for the strange namespace declaration. I just
tried to make
the smallest possible cut down example of my original
template. An
extract from my orignal template looks like this:

...
<Meta>
    <Type
xmlns="syncml:metinf">${replace.type}</Type&
gt;
    <Version
xmlns="syncml:metinf">${replace.version}</Ve
rsion>
    <Size py:if="replace.size"
xmlns="syncml:metinf">${replace.size}</
Size>
</Meta>
<Item>
    <Target>
    ....
</Item>

In this code, xmlns="syncml:metinf" also jumps
down to Item

-- Dag


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Re: Namespace problems with py:if
country flaguser name
United States		 2007-03-28 02:05:43 
On Mar 26, 8:33 pm, "Shannon -jj Behrens"
<jji...gmail.com> wrote:
> Although I don't completely understand your problem, I
wouldn't say
> Genshi is not fit for production.  I'm using Genshi in
production.
>
> By the way, all of my templates look like:
>
> <html xmlns="http://www.w3.org/
1999/xhtml"
>       xmlns:py="http://genshi.edgew
all.org/"
>       xmlnsi=&qu
ot;http://www.w3.o
rg/2001/XInclude"
>       py:strip="">
>
> Stuff here.
>
> </html>
>
> That way all the namespaces get setup in a predictable
manner.
>
> Happy Hacking!
> -jj

This is interesting. I have tried to experiment a bit and
found out
that the following code produces correct output:

<?xml version="1.0"?>
<Test xmlns:py="http://genshi.edgew
all.org/"
xmlns:ns0="syncml:metinf">
<ns0:Size py:if="0">Size</ns0:Size>
<Item/>
</Test>"

The next example produces incorrect output. If the namespace
is
declared in the Size element, then the namespace jumps to
Item:

<?xml version="1.0"?>
<Test xmlns:py="http://genshi.edgew
all.org/" >
<ns0:Size py:if="0"
xmlns:ns0="syncml:metinf">Size</ns0:Size>

<Item/>
</Test>"

If you parse the first example into an elementtree and then
prints it
with tostring it will produce the same xml as the second
example, but
Genshi can only handle the first example. So this must be a
bug.

-- Dag


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Re: Namespace problems with py:if
country flaguser name
Germany		 2007-04-02 09:50:14 
Am 28.03.2007 um 09:05 schrieb dbrattli:
> This is interesting. I have tried to experiment a bit
and found out
> that the following code produces correct output:
>
> <?xml version="1.0"?>
> <Test xmlns:py="http://genshi.edgew
all.org/"
> xmlns:ns0="syncml:metinf">
> <ns0:Size
py:if="0">Size</ns0:Size>
> <Item/>
> </Test>"
>
> The next example produces incorrect output. If the
namespace is
> declared in the Size element, then the namespace jumps
to Item:
>
> <?xml version="1.0"?>
> <Test xmlns:py="http://genshi.edgew
all.org/" >
> <ns0:Size py:if="0"
xmlns:ns0="syncml:metinf">Size</ns0:Size>

> <Item/>
> </Test>"
>
> If you parse the first example into an elementtree and
then prints it
> with tostring it will produce the same xml as the
second example, but
> Genshi can only handle the first example. So this must
be a bug.

Definitely. The cause of the problem is that namespace
declarations  
become events that are separate from the start-tag event
they belong  
to. So when a conditional directive such as <py:if>
removes an  
element, the START_NS event remains in the stream whereas
the start- 
tag is gone, and will make the serializer add a bogus
namespace  
declaration.

Thanks for filing the ticket on this. I'm not yet sure how
to address  
the issue. Improving the namespace story has been on my list
for  
quite some time now, and while there have been a number of 

improvements in trunk, it's nowhere near perfect yet for
heavy use of  
mixed namespaces in templates.

Cheers,
Chris
--
Christopher Lenz
   cmlenz at gmx.de
   http://www.cmlenz.net/


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Re: Namespace problems with py:if
country flaguser name
Germany		 2007-04-02 10:59:28 
Am 02.04.2007 um 16:50 schrieb Christopher Lenz:
> Definitely. The cause of the problem is that namespace
declarations
> become events that are separate from the start-tag
event they belong
> to. So when a conditional directive such as
<py:if> removes an
> element, the START_NS event remains in the stream
whereas the start-
> tag is gone, and will make the serializer add a bogus
namespace
> declaration.

Oops, after actually looking into the issue, it's not all
that bad,  
and was simple to fix. It should be fixed now on trunk. I'd
love to  
hear whether the fix works for you!

Thanks,
Chris
--
Christopher Lenz
   cmlenz at gmx.de
   http://www.cmlenz.net/


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Re: Namespace problems with py:if
country flaguser name
United States		 2007-04-03 01:45:17 
On Apr 2, 5:59 pm, Christopher Lenz <cml...gmx.de> wrote:
> Oops, after actually looking into the issue, it's not
all that bad,  
> and was simple to fix. It should be fixed now on trunk.
I'd love to  
> hear whether the fix works for you!
>
> Thanks,
> Chris
> --
> Christopher Lenz
>    cmlenz at gmx.de
>    http://www.cmlenz.net/

Works like a charm with my original template! To check that
you had
done your work properly, I have also checked other
contructions like
<Elem py:replace="''"
xmlns="testns">, <Elem py:for="item in
[]"
xmlns="testns"> and <Elem
py:strip="True" xmlns="testns">. As
I
suspected, they all fail with the previous version, but I'm
happy to
say that they are now handled correctly in trunk (531).

Thanks a lot

-- Dag


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