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#!/usr/bin/env python
#
# Copyright (C) 2019 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import argparse
import collections
import json
import sys
def follow_path(obj, path):
cur = obj
last_key = None
for key in path.split('.'):
if last_key:
if last_key not in cur:
return None,None
cur = cur[last_key]
last_key = key
if last_key not in cur:
return None,None
return cur, last_key
def ensure_path(obj, path):
cur = obj
last_key = None
for key in path.split('.'):
if last_key:
if last_key not in cur:
cur[last_key] = dict()
cur = cur[last_key]
last_key = key
return cur, last_key
class SetValue(str):
def apply(self, obj, val):
cur, key = ensure_path(obj, self)
cur[key] = val
class Replace(str):
def apply(self, obj, val):
cur, key = follow_path(obj, self)
if cur:
cur[key] = val
class Remove(str):
def apply(self, obj):
cur, key = follow_path(obj, self)
if cur:
del cur[key]
class AppendList(str):
def apply(self, obj, *args):
cur, key = ensure_path(obj, self)
if key not in cur:
cur[key] = list()
if not isinstance(cur[key], list):
raise ValueError(self + " should be a array.")
cur[key].extend(args)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-o', '--out',
help='write result to a file. If omitted, print to stdout',
metavar='output',
action='store')
parser.add_argument('input', nargs='?', help='JSON file')
parser.add_argument("-v", "--value", type=SetValue,
help='set value of the key specified by path. If path doesn\'t exist, creates new one.',
metavar=('path', 'value'),
nargs=2, dest='patch', default=[], action='append')
parser.add_argument("-s", "--replace", type=Replace,
help='replace value of the key specified by path. If path doesn\'t exist, no op.',
metavar=('path', 'value'),
nargs=2, dest='patch', action='append')
parser.add_argument("-r", "--remove", type=Remove,
help='remove the key specified by path. If path doesn\'t exist, no op.',
metavar='path',
nargs=1, dest='patch', action='append')
parser.add_argument("-a", "--append_list", type=AppendList,
help='append values to the list specified by path. If path doesn\'t exist, creates new list for it.',
metavar=('path', 'value'),
nargs='+', dest='patch', default=[], action='append')
args = parser.parse_args()
if args.input:
with open(args.input) as f:
obj = json.load(f, object_pairs_hook=collections.OrderedDict)
else:
obj = json.load(sys.stdin, object_pairs_hook=collections.OrderedDict)
for p in args.patch:
p[0].apply(obj, *p[1:])
if args.out:
with open(args.out, "w") as f:
json.dump(obj, f, indent=2)
else:
print(json.dumps(obj, indent=2))
if __name__ == '__main__':
main()
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