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# -*- coding: utf-8 -*- # # python-json-pointer - An implementation of the JSON Pointer syntax # https://github.com/stefankoegl/python-json-pointer # # 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. # """ Identify specific nodes in a JSON document (RFC 6901) """ from __future__ import unicode_literals # Will be parsed by setup.py to determine package metadata __author__ = 'Stefan Kögl <stefan@skoegl.net>' __version__ = '2.0' __website__ = 'https://github.com/stefankoegl/python-json-pointer' __license__ = 'Modified BSD License' try: from itertools import izip str = unicode except ImportError: # Python 3 izip = zip try: from collections.abc import Mapping, Sequence except ImportError: # Python 3 from collections import Mapping, Sequence from itertools import tee import re import copy _nothing = object() def set_pointer(doc, pointer, value, inplace=True): """Resolves pointer against doc and sets the value of the target within doc. With inplace set to true, doc is modified as long as pointer is not the root. >>> obj = {'foo': {'anArray': [ {'prop': 44}], 'another prop': {'baz': 'A string' }}} >>> set_pointer(obj, '/foo/anArray/0/prop', 55) == \ {'foo': {'another prop': {'baz': 'A string'}, 'anArray': [{'prop': 55}]}} True >>> set_pointer(obj, '/foo/yet another prop', 'added prop') == \ {'foo': {'another prop': {'baz': 'A string'}, 'yet another prop': 'added prop', 'anArray': [{'prop': 55}]}} True >>> obj = {'foo': {}} >>> set_pointer(obj, '/foo/a%20b', 'x') == \ {'foo': {'a%20b': 'x' }} True """ pointer = JsonPointer(pointer) return pointer.set(doc, value, inplace) def resolve_pointer(doc, pointer, default=_nothing): """ Resolves pointer against doc and returns the referenced object >>> obj = {'foo': {'anArray': [ {'prop': 44}], 'another prop': {'baz': 'A string' }}, 'a%20b': 1, 'c d': 2} >>> resolve_pointer(obj, '') == obj True >>> resolve_pointer(obj, '/foo') == obj['foo'] True >>> resolve_pointer(obj, '/foo/another prop') == obj['foo']['another prop'] True >>> resolve_pointer(obj, '/foo/another prop/baz') == obj['foo']['another prop']['baz'] True >>> resolve_pointer(obj, '/foo/anArray/0') == obj['foo']['anArray'][0] True >>> resolve_pointer(obj, '/some/path', None) == None True >>> resolve_pointer(obj, '/a b', None) == None True >>> resolve_pointer(obj, '/a%20b') == 1 True >>> resolve_pointer(obj, '/c d') == 2 True >>> resolve_pointer(obj, '/c%20d', None) == None True """ pointer = JsonPointer(pointer) return pointer.resolve(doc, default) def pairwise(iterable): """ Transforms a list to a list of tuples of adjacent items s -> (s0,s1), (s1,s2), (s2, s3), ... >>> list(pairwise([])) [] >>> list(pairwise([1])) [] >>> list(pairwise([1, 2, 3, 4])) [(1, 2), (2, 3), (3, 4)] """ a, b = tee(iterable) for _ in b: break return izip(a, b) class JsonPointerException(Exception): pass class EndOfList(object): """Result of accessing element "-" of a list""" def __init__(self, list_): self.list_ = list_ def __repr__(self): return '{cls}({lst})'.format(cls=self.__class__.__name__, lst=repr(self.list_)) class JsonPointer(object): """A JSON Pointer that can reference parts of an JSON document""" # Array indices must not contain: # leading zeros, signs, spaces, decimals, etc _RE_ARRAY_INDEX = re.compile('0|[1-9][0-9]*$') _RE_INVALID_ESCAPE = re.compile('(~[^01]|~$)') def __init__(self, pointer): # validate escapes invalid_escape = self._RE_INVALID_ESCAPE.search(pointer) if invalid_escape: raise JsonPointerException('Found invalid escape {}'.format( invalid_escape.group())) parts = pointer.split('/') if parts.pop(0) != '': raise JsonPointerException('location must starts with /') parts = [unescape(part) for part in parts] self.parts = parts def to_last(self, doc): """Resolves ptr until the last step, returns (sub-doc, last-step)""" if not self.parts: return doc, None for part in self.parts[:-1]: doc = self.walk(doc, part) return doc, self.get_part(doc, self.parts[-1]) def resolve(self, doc, default=_nothing): """Resolves the pointer against doc and returns the referenced object""" for part in self.parts: try: doc = self.walk(doc, part) except JsonPointerException: if default is _nothing: raise else: return default return doc get = resolve def set(self, doc, value, inplace=True): """Resolve the pointer against the doc and replace the target with value.""" if len(self.parts) == 0: if inplace: raise JsonPointerException('cannot set root in place') return value if not inplace: doc = copy.deepcopy(doc) (parent, part) = self.to_last(doc) parent[part] = value return doc def get_part(self, doc, part): """Returns the next step in the correct type""" if isinstance(doc, Mapping): return part elif isinstance(doc, Sequence): if part == '-': return part if not self._RE_ARRAY_INDEX.match(str(part)): raise JsonPointerException("'%s' is not a valid sequence index" % part) return int(part) elif hasattr(doc, '__getitem__'): # Allow indexing via ducktyping # if the target has defined __getitem__ return part else: raise JsonPointerException("Document '%s' does not support indexing, " "must be mapping/sequence or support __getitem__" % type(doc)) def walk(self, doc, part): """ Walks one step in doc and returns the referenced part """ part = self.get_part(doc, part) assert hasattr(doc, '__getitem__'), "invalid document type %s" % (type(doc),) if isinstance(doc, Sequence): if part == '-': return EndOfList(doc) try: return doc[part] except IndexError: raise JsonPointerException("index '%s' is out of bounds" % (part, )) # Else the object is a mapping or supports __getitem__(so assume custom indexing) try: return doc[part] except KeyError: raise JsonPointerException("member '%s' not found in %s" % (part, doc)) def contains(self, ptr): """ Returns True if self contains the given ptr """ return self.parts[:len(ptr.parts)] == ptr.parts def __contains__(self, item): """ Returns True if self contains the given ptr """ return self.contains(item) @property def path(self): """Returns the string representation of the pointer >>> ptr = JsonPointer('/~0/0/~1').path == '/~0/0/~1' """ parts = [escape(part) for part in self.parts] return ''.join('/' + part for part in parts) def __eq__(self, other): """Compares a pointer to another object Pointers can be compared by comparing their strings (or splitted strings), because no two different parts can point to the same structure in an object (eg no different number representations) """ if not isinstance(other, JsonPointer): return False return self.parts == other.parts def __hash__(self): return hash(tuple(self.parts)) @classmethod def from_parts(cls, parts): """Constructs a JsonPointer from a list of (unescaped) paths >>> JsonPointer.from_parts(['a', '~', '/', 0]).path == '/a/~0/~1/0' True """ parts = [escape(str(part)) for part in parts] ptr = cls(''.join('/' + part for part in parts)) return ptr def escape(s): return s.replace('~', '~0').replace('/', '~1') def unescape(s): return s.replace('~1', '/').replace('~0', '~')