Hi,
I'm currently implementing a tool for auto-generating webforms from a
desription file. The output should become a php-script, an asp-script,
zope-formulator or such. Each if it may (or may not) have javascript
additions. The output format should be defined ar runtime (php,
php+javascrip, asp, asp+javascript, etc.).
Currently I have a fixed class hierarchy:
generic : implements generic html widgets (input, radiobuttons)
php : "mixin" for adding php-specifi code to the widget,
eg. getting values from HTTP_POST_VARS/_POST
javascript : adds javascript scripts, eg. error checking
Obviously this does not scale as soon as I add more mid-layers (asp,
psp, etc.).
For me this sounds like I could benefit from using metaclasses here.
Before I start implementing such a beast, I want to be shure, there will
be a benefit.
Any suggestions?
--
Schönen Gruß - Regards
Hartmut Goebel
| Hartmut Goebel | IT-Security -- effizient |
| h.******@goebel-consult.de | www.goebel-consult.de | 1  1338 
Hartmut Goebel <h.******@goebe l-consult.de> wrote in message news:<41******* *************** @newsread2.arco r-online.net>... Hi,
I'm currently implementing a tool for auto-generating webforms from a
desription file. The output should become a php-script, an asp-script,
zope-formulator or such. Each if it may (or may not) have javascript
additions. The output format should be defined ar runtime (php,
php+javascrip, asp, asp+javascript, etc.).
Currently I have a fixed class hierarchy:
generic : implements generic html widgets (input, radiobuttons)
php : "mixin" for adding php-specifi code to the widget,
eg. getting values from HTTP_POST_VARS/_POST
javascript : adds javascript scripts, eg. error checking
Obviously this does not scale as soon as I add more mid-layers (asp,
psp, etc.).
For me this sounds like I could benefit from using metaclasses here.
Before I start implementing such a beast, I want to be shure, there will
be a benefit.
Any suggestions?
Metaclasses are essentially syntactic sugar. You can do more or less
everything without them. For instance you can use a poor man function
to
format your classes as you wish. Then, you have to apply the function
to the every subclass by hand. If you use a metaclass, subclasses are
automatically reformatted, instead. So, using a function means
a bit more typing but greater expliciteness. Metaclasses are okay
if you want to hide to your users the fact that something magic is
going on.
Michele Simionato This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Stephan Diehl |
last post by:
I have a question about metaclasses:
How would be the best way to "merge" different metaclasses?
Or, more precisely, what is the best way to merge metaclass functionality?
The idea is basicly the following:
One has several (metaclass) modules that implements an interesting feature.
Lets say, I have a metaclass L, that adds logging capabilities to all method
calls and another one, called P, that creates properties on the fly.
|
by: Mike C. Fletcher |
last post by:
Slides from my PyGTA presentation on Tuesday, focusing mostly on
why/where you would want to use meta-classes, are available in PDF format:
http://members.rogers.com/mcfletch/programming/metaclasses.pdf
BTW, for those not on Python-list, be sure to check out David &
Michele's newest developerworks article on the topic:
http://www.ibm.com/developerworks/library/l-pymeta.html...
|
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last post by:
Im trying to use AOP techniques on python but, even if I understand
the idea behind metaclasses, I cant find a way to use AOP in a dynamic
way.
What im trying to do is to weave an aspect to a class at runtime, but
i don't want to include any special code or definition in the class
itself. Also, i want to do
it just for some particular classes. Is there any way to do this?
I know its possible to apply an aspect to all the classes by
|
by: Michael Sparks |
last post by:
Anyway...
At Europython Guido discussed with everyone the outstanding issue with
decorators and there was a clear majority in favour of having them, which
was good. From where I was sitting it looked like about 20:20 split on the
following syntaxes:
1 def func(arg1, arg2, arg3) :
function...
2 def func(arg1, arg2, arg3):
function...
|
by: Jean-François Doyon |
last post by:
Hello,
I'm using MetaClasses to create classes.
How do I make these new classes "globally" available?
I probably just have to assign them to something magic, but I can't seem to
figure out which one.
if I do:
| | |
by: Paul Morrow |
last post by:
....that they warrant an entirely new syntax? It seems that they are
very similar in a very significant way --- they alter the default
behavior of something. IMO, it's not a stretch to say that they
'parallel' metaclasses; that they are to functions/methods what
metaclasses are to classes. So why don't they share a similar syntax?
class Foo:
""" This is the docstring for class Foo. """
__metaclass__ = M
# body of class goes here
|
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last post by:
Hello,
I've been experimenting with metaclasses a bit (even though I am quite
a newbie to python) and stumpled over the following problem in my code:
class Meta(type):
def __init__(cls, name, bases, dct):
for attr, value in dct.items():
if callable(value):
dct = wrapper(value)
|
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last post by:
Hi!
I've just posted a question about metaclasses in ZOPE on the ZOPE
list, and one of the replies said that metaclasses (at least
"painless" metaclasses) cannot be used without new-style classes (or
rather, that they don't work where you cannot explicitly use new-style
classes). I haven't so far been able to find _anything_ on the subject
- what is true here?
TIA,
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Forman's book is out of print.
Is there a good substitute?
Thanks,
Alan Isaac
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