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*.pyc | ||
build |
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Stefan Kögl <stefan@skoegl.net> |
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Copyright (c) 2011 Stefan Kögl <stefan@skoegl.net> | ||
All rights reserved. | ||
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Redistribution and use in source and binary forms, with or without | ||
modification, are permitted provided that the following conditions | ||
are met: | ||
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1. Redistributions of source code must retain the above copyright | ||
notice, this list of conditions and the following disclaimer. | ||
2. Redistributions in binary form must reproduce the above copyright | ||
notice, this list of conditions and the following disclaimer in the | ||
documentation and/or other materials provided with the distribution. | ||
3. The name of the author may not be used to endorse or promote products | ||
derived from this software without specific prior written permission. | ||
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
|
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python-json-patch: Applying JSON Patches | ||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
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Library to apply JSON Patches according to | ||
http://tools.ietf.org/html/draft-pbryan-json-patch-01 | ||
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See Sourcecode for Examples | ||
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Website: https://github.com/stefankoegl/python-json-patch | ||
Repository: https://github.com/stefankoegl/python-json-patch.git |
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# -*- coding: utf-8 -*- | ||
# | ||
# python-json-patch - An implementation of the JSON Patch format | ||
# https://github.com/stefankoegl/python-json-patch | ||
# | ||
# Copyright (c) 2011 Stefan Kögl <stefan@skoegl.net> | ||
# All rights reserved. | ||
# | ||
# Redistribution and use in source and binary forms, with or without | ||
# modification, are permitted provided that the following conditions | ||
# are met: | ||
# | ||
# 1. Redistributions of source code must retain the above copyright | ||
# notice, this list of conditions and the following disclaimer. | ||
# 2. Redistributions in binary form must reproduce the above copyright | ||
# notice, this list of conditions and the following disclaimer in the | ||
# documentation and/or other materials provided with the distribution. | ||
# 3. The name of the author may not be used to endorse or promote products | ||
# derived from this software without specific prior written permission. | ||
# | ||
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
# | ||
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"""Apply JSON-Patches according to http://tools.ietf.org/html/draft-pbryan-json-patch-01""" | ||
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# Will be parsed by setup.py to determine package metadata | ||
__author__ = 'Stefan Kögl <stefan@skoegl.net>' | ||
__version__ = '0.1' | ||
__website__ = 'https://github.com/stefankoegl/python-json-patch' | ||
__license__ = 'Modified BSD License' | ||
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import copy | ||
import json | ||
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class JsonPatchException(Exception): | ||
pass | ||
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class JsonPatch(object): | ||
""" A JSON Patch is a list of Patch Operations """ | ||
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def __init__(self, patch): | ||
self.patch = patch | ||
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self.OPERATIONS = { | ||
'remove': RemoveOperation, | ||
'add': AddOperation, | ||
'replace': ReplaceOperation, | ||
} | ||
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@classmethod | ||
def from_string(cls, patch_str): | ||
patch = json.loads(patch_str) | ||
return cls(patch) | ||
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def apply(self, obj): | ||
""" Applies the patch to a copy of the given object """ | ||
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obj = copy.deepcopy(obj) | ||
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for operation in self.patch: | ||
op = self._get_operation(operation) | ||
op.apply(obj) | ||
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return obj | ||
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def _get_operation(self, operation): | ||
for action, op_cls in self.OPERATIONS.items(): | ||
if action in operation: | ||
location = operation[action] | ||
op = op_cls(location, operation) | ||
return op | ||
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raise JsonPatchException("invalid operation '%s'" % operation) | ||
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class PatchOperation(object): | ||
""" A single operation inside a JSON Patch """ | ||
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def __init__(self, location, operation): | ||
self.location = location | ||
self.operation = operation | ||
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def locate(self, obj, location, last_must_exist=True): | ||
""" Walks through the object according to location | ||
Returns the last step as (sub-object, last location-step) """ | ||
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parts = location.split('/') | ||
if parts.pop(0) != '': | ||
raise JsonPatchException('location must starts with /') | ||
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for part in parts[:-1]: | ||
obj, loc_part = self._step(obj, part) | ||
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_, last_loc = self._step(obj, parts[-1], must_exist=last_must_exist) | ||
return obj, last_loc | ||
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def _step(self, obj, loc_part, must_exist=True): | ||
""" Goes one step in a locate() call """ | ||
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# Its not clear if a location "1" should be considered as 1 or "1" | ||
# We prefer the integer-variant if possible | ||
part_variants = self._try_parse(loc_part) + [loc_part] | ||
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for variant in part_variants: | ||
try: | ||
return obj[variant], variant | ||
except: | ||
continue | ||
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if must_exist: | ||
raise JsonPatchException('key %s not found' % loc_part) | ||
else: | ||
return obj, part_variants[0] | ||
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@staticmethod | ||
def _try_parse(val, cls=int): | ||
try: | ||
return [cls(val)] | ||
except: | ||
return [] | ||
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class RemoveOperation(PatchOperation): | ||
""" Removes an object property or an array element | ||
>>> obj = { 'baz': 'qux', 'foo': 'bar' } | ||
>>> patch = JsonPatch( [ { 'remove': '/baz' } ] ) | ||
>>> patch.apply(obj) | ||
{'foo': 'bar'} | ||
>>> obj = { 'foo': [ 'bar', 'qux', 'baz' ] } | ||
>>> patch = JsonPatch( [ { "remove": "/foo/1" } ] ) | ||
>>> patch.apply(obj) | ||
{'foo': ['bar', 'baz']} | ||
""" | ||
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def apply(self, obj): | ||
subobj, part = self.locate(obj, self.location) | ||
del subobj[part] | ||
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class AddOperation(PatchOperation): | ||
""" Adds an object property or an array element | ||
>>> obj = { "foo": "bar" } | ||
>>> patch = JsonPatch([ { "add": "/baz", "value": "qux" } ]) | ||
>>> patch.apply(obj) | ||
{'foo': 'bar', 'baz': 'qux'} | ||
>>> obj = { "foo": [ "bar", "baz" ] } | ||
>>> patch = JsonPatch([ { "add": "/foo/1", "value": "qux" } ]) | ||
>>> patch.apply(obj) | ||
{'foo': ['bar', 'qux', 'baz']} | ||
""" | ||
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def apply(self, obj): | ||
value = self.operation["value"] | ||
subobj, part = self.locate(obj, self.location, last_must_exist=False) | ||
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if isinstance(subobj, list): | ||
if part > len(subobj) or part < 0: | ||
raise JsonPatchException("can't insert outside of list") | ||
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subobj.insert(part, value) | ||
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elif isinstance(subobj, dict): | ||
if part in subobj: | ||
raise JsonPatchException("object '%s' already exists" % part) | ||
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subobj[part] = value | ||
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else: | ||
raise JsonPatchException("can't add to type '%s'" % subobj.__class__.__name__) | ||
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class ReplaceOperation(PatchOperation): | ||
""" Replaces a value | ||
>>> obj = { "baz": "qux", "foo": "bar" } | ||
>>> patch = JsonPatch([ { "replace": "/baz", "value": "boo" } ]) | ||
>>> patch.apply(obj) | ||
{'foo': 'bar', 'baz': 'boo'} | ||
""" | ||
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def apply(self, obj): | ||
location = self. operation["replace"] | ||
value = self.operation["value"] | ||
subobj, part = self.locate(obj, self.location) | ||
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if isinstance(subobj, list): | ||
if part > len(subobj) or part < 0: | ||
raise JsonPatchException("can't replace outside of list") | ||
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elif isinstance(subobj, dict): | ||
if not part in subobj: | ||
raise JsonPatchException("can't replace non-existant object '%s'" % part) | ||
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else: | ||
raise JsonPatchException("can't replace in type '%s'" % subobj.__class__.__name__) | ||
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subobj[part] = value |
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#!/usr/bin/env python | ||
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from distutils.core import setup | ||
import re | ||
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src = open('jsonpatch.py').read() | ||
metadata = dict(re.findall("__([a-z]+)__ = '([^']+)'", src)) | ||
docstrings = re.findall('"""(.*)"""', src) | ||
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PACKAGE = 'jsonpatch' | ||
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MODULES = ( | ||
'jsonpatch', | ||
) | ||
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AUTHOR_EMAIL = metadata['author'] | ||
VERSION = metadata['version'] | ||
WEBSITE = metadata['website'] | ||
LICENSE = metadata['license'] | ||
DESCRIPTION = docstrings[0] | ||
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# Extract name and e-mail ("Firstname Lastname <mail@example.org>") | ||
AUTHOR, EMAIL = re.match(r'(.*) <(.*)>', AUTHOR_EMAIL).groups() | ||
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setup(name=PACKAGE, | ||
version=VERSION, | ||
description=DESCRIPTION, | ||
author=AUTHOR, | ||
author_email=EMAIL, | ||
license=LICENSE, | ||
url=WEBSITE, | ||
py_modules=MODULES, | ||
) |