cheetah templating: place holders needed in a template

[ajay.padala]

Hi

I would like to be able to get the inputs that are needed into a
template file programmatically.

For example if we had a template:

=====================
$name has $num marbles in his hand.
=====================

I want to be able to initialise this template and call a method on it
to get the list ['name', 'num']

Is there anything in cheetah which does this?

At present, I am sending a "fake" dictionary into the searchList to do
this. This is coded as.

fake = Generic()
t = Template(file=absFileName, searchList=[fake])
print fake.calledAtts

=========================================

class Generic(object):
""" Generic object can pretend to be a dictionary or a list and
doesn't throw
any errors whatever you call it for """

# def __new__(cls, *args, **kwargs):
# if '_inst' not in vars(cls):
# cls._inst = object.__new__(cls, *args, **kwargs)
# return cls._inst

calledAtts = sets.Set()

def __init__(self, *args, **kwargs):
pass

def __call__(self, *args, **kwargs):
return self

def __repr__(self):
return "Generic"

def __nonzero__(self):
return True

def __getattr__(self, name):
return self

__delattr__ = __getattr__

def __setattr__(self, name, value):
return self

def __len__(self):
return 1

def __iter__(self):
return iter(("Generic",))

def __getitem__(self, i):
if isinstance(i,types.StringType):
self.calledAtts.add(str(i))
return self

def __setitem__(self, i, v):
return self

def __contains__(self, itemName):
print "contains " + itemName
return True

def has_key(self, *args, **kwargs):
# print "has key called"
return True

__delitem__ = __getitem__

========================================

This just logs each access to the dictionary and stores the key under
self.calledAtts

But obviously this won't work if I have #if statements etc. I am hoping
cheetah already has this feature somewhere which is much more robust
but I can't find it.

Ajay