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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class Merger(object):
def __init__(self, merger, opts):
self._merger = merger
self._discard_non = 'discard_non_list' in opts
self._extend = 'extend' in opts
def _on_tuple(self, value, merge_with):
return self._on_list(list(value), merge_with)
# On encountering a list or tuple type this action will be applied
# a new list will be returned, if the value to merge with is itself
# a list and we have been told to 'extend', then the value here will
# be extended with the other list. If in 'extend' mode then we will
# attempt to merge instead, which means that values from the list
# to merge with will replace values in te original list (they will
# also be merged recursively).
#
# If the value to merge with is not a list, and we are set to discared
# then no modifications will take place, otherwise we will just append
# the value to merge with onto the end of our own list.
def _on_list(self, value, merge_with):
new_value = list(value)
if isinstance(merge_with, (tuple, list)):
if self._extend:
new_value.extend(merge_with)
else:
return new_value
else:
if not self._discard_non:
new_value.append(merge_with)
return new_value
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