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import abc
from .serializing import SerializingObject
class TaskFilter(object):
"""
Abstract base class that defines interface of a TaskFilter.
"""
@abc.abstractmethod
def add_filter(self, arg):
"""
Processes an non-keyword filter.
"""
pass
@abc.abstractmethod
def add_filter_param(self, key, value):
"""
Processes a keyword filter.
"""
pass
@abc.abstractmethod
def clone(self):
"""
Returns a new deep copy of itself.
"""
pass
class TaskWarriorFilter(TaskFilter, SerializingObject):
"""
A set of parameters to filter the task list with.
"""
def __init__(self, backend, filter_params=None):
self.filter_params = filter_params or []
super(TaskFilter, self).__init__(backend)
def add_filter(self, filter_str):
self.filter_params.append(filter_str)
def add_filter_param(self, key, value):
key = key.replace('__', '.')
# Replace the value with empty string, since that is the
# convention in TW for empty values
attribute_key = key.split('.')[0]
# Since this is user input, we need to normalize before we serialize
value = self._normalize(attribute_key, value)
value = self._serialize(attribute_key, value)
# If we are filtering by uuid:, do not use uuid keyword
# due to TW-1452 bug
if key == 'uuid':
self.filter_params.insert(0, value)
else:
# Surround value with aphostrophes unless it's a empty string
value = "'%s'" % value if value else ''
# We enforce equality match by using 'is' (or 'none') modifier
# Without using this syntax, filter fails due to TW-1479
# which is, however, fixed in 2.4.5
if self.backend.version < self.backend.VERSION_2_4_5:
modifier = '.is' if value else '.none'
key = key + modifier if '.' not in key else key
self.filter_params.append("{0}:{1}".format(key, value))
def get_filter_params(self):
return [f for f in self.filter_params if f]
def clone(self):
c = self.__class__(self.backend)
c.filter_params = list(self.filter_params)
return c
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