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# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
DEF_MERGE_TYPE = "no_replace"
MERGE_TYPES = (
"replace",
DEF_MERGE_TYPE,
)
def _has_any(what, *keys):
for k in keys:
if k in what:
return True
return False
class Merger:
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 = "recurse_str" in opts
self._recurse_array = _has_any(opts, "recurse_array", "recurse_list")
self._allow_delete = "allow_delete" in opts
# Backwards compat require this to be on.
self._recurse_dict = True
def __str__(self):
s = (
"DictMerger: (method=%s,recurse_str=%s,"
"recurse_dict=%s,recurse_array=%s,allow_delete=%s)"
)
s = s % (
self._method,
self._recurse_str,
self._recurse_dict,
self._recurse_array,
self._allow_delete,
)
return s
def _do_dict_replace(self, value, merge_with, do_replace):
def merge_same_key(old_v, new_v):
if do_replace:
return new_v
if isinstance(new_v, (list, tuple)) and self._recurse_array:
return self._merger.merge(old_v, new_v)
if isinstance(new_v, str) 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)
# Otherwise leave it be...
return old_v
for k, v in merge_with.items():
if k in value:
if v is None and self._allow_delete:
value.pop(k)
else:
value[k] = merge_same_key(value[k], v)
else:
value[k] = v
return value
def _on_dict(self, value, merge_with):
if not isinstance(merge_with, (dict)):
return value
if self._method == "replace":
merged = self._do_dict_replace(dict(value), merge_with, True)
elif self._method == "no_replace":
merged = self._do_dict_replace(dict(value), merge_with, False)
else:
raise NotImplementedError("Unknown merge type %s" % (self._method))
return merged