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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/>.
DEF_MERGE_TYPE = 'replace'
MERGE_TYPES = ('append', 'prepend', DEF_MERGE_TYPE, 'no_replace')
def _has_any(what, *keys):
for k in keys:
if k in what:
return True
return False
class Merger(object):
def __init__(self, merger, opts):
self._merger = merger
# Affects merging behavior...
self._method = DEF_MERGE_TYPE
for m in MERGE_TYPES:
if m in opts:
self._method = m
break
# Affect how recursive merging is done on other primitives
self._recurse_str = _has_any(opts, 'recurse_str')
self._recurse_dict = _has_any(opts, 'recurse_dict')
self._recurse_array = _has_any(opts, 'recurse_array', 'recurse_list')
def __str__(self):
return ('ListMerger: (method=%s,recurse_str=%s,'
'recurse_dict=%s,recurse_array=%s)') % (self._method,
self._recurse_str,
self._recurse_dict,
self._recurse_array)
def _on_tuple(self, value, merge_with):
return tuple(self._on_list(list(value), merge_with))
def _on_list(self, value, merge_with):
if (self._method == 'replace' and
not isinstance(merge_with, (tuple, list))):
return merge_with
# Ok we now know that what we are merging with is a list or tuple.
merged_list = []
if self._method == 'prepend':
merged_list.extend(merge_with)
merged_list.extend(value)
return merged_list
elif self._method == 'append':
merged_list.extend(value)
merged_list.extend(merge_with)
return merged_list
def merge_same_index(old_v, new_v):
if self._method == 'no_replace':
# Leave it be...
return old_v
if isinstance(new_v, (list, tuple)) and self._recurse_array:
return self._merger.merge(old_v, new_v)
if isinstance(new_v, (str, basestring)) and self._recurse_str:
return self._merger.merge(old_v, new_v)
if isinstance(new_v, (dict)) and self._recurse_dict:
return self._merger.merge(old_v, new_v)
return new_v
# Ok now we are replacing same indexes
merged_list.extend(value)
common_len = min(len(merged_list), len(merge_with))
for i in xrange(0, common_len):
merged_list[i] = merge_same_index(merged_list[i], merge_with[i])
return merged_list
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