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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)
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:
# Merge instead
for m_v in merge_with:
m_am = 0
for (i, o_v) in enumerate(new_value):
if m_v == o_v:
new_value[i] = self._merger.merge(o_v, m_v)
m_am += 1
if m_am == 0:
new_value.append(m_v)
else:
if not self._discard_non:
new_value.append(merge_with)
return new_value
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