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The only official docs, which I’m sure you found are here.
Other good places to look are, the user group, the developer group, the source code, and the source code history,
As far as compile_filter
goes. The source (with a docstring) says.
def compile_filter(self, token):
"Convenient wrapper for FilterExpression"
return FilterExpression(token, self)
And FilterExpression is documented here as:
Parses a variable token and its
optional filters (all as a single
string), and return a list of tuples
of the filter name and arguments.
Sample:
>>> token = 'variable|default:"Default value"|date:"Y-m-d"'
>>> p = Parser('')
>>> fe = FilterExpression(token, p)
>>> len(fe.filters)
2
>>> fe.var
'variable'
Source:stackexchange.com