36 |
36 |
integer_re = re.compile('-?[0-9]+')
|
37 |
37 |
|
38 |
38 |
|
39 |
|
def join_path(sep, path):
|
40 |
|
iterable = ((str(n) if isinstance(n, (int, long)) else n) for n in path)
|
41 |
|
return sep.join(iterable)
|
|
39 |
def unpack(pathstr, sep='.'):
|
|
40 |
"""
|
|
41 |
>>> unpack('a.-2.x')
|
|
42 |
['a', -2, 'x']
|
|
43 |
"""
|
|
44 |
names = pathstr.split(sep)
|
|
45 |
parse = lambda x: int(x) if integer_re.match(x) else x
|
|
46 |
return [parse(x) for x in names]
|
42 |
47 |
|
43 |
48 |
|
44 |
|
def lookup_path(container, path, sep='.', createpath=False):
|
|
49 |
def lookup_path(container, path, createpath=False):
|
45 |
50 |
"""
|
46 |
51 |
return (['a','b'],
|
47 |
52 |
[container['a'], container['a']['b']],
|
48 |
|
'c') where path=sep.join(['a','b','c'])
|
|
53 |
'c') where path=['a','b','c']
|
49 |
54 |
|
50 |
55 |
"""
|
51 |
|
names = path.split(sep)
|
52 |
|
dirnames = names[:-1]
|
53 |
|
basename = names[-1]
|
54 |
|
if integer_re.match(basename):
|
55 |
|
basename = int(basename)
|
|
56 |
dirnames = path[:-1]
|
|
57 |
basename = path[-1]
|
56 |
58 |
|
57 |
59 |
node = container
|
58 |
60 |
name_path = []
|
59 |
61 |
node_path = [node]
|
60 |
62 |
for name in dirnames:
|
61 |
63 |
name_path.append(name)
|
62 |
|
|
63 |
|
if integer_re.match(name):
|
64 |
|
name = int(name)
|
65 |
|
|
66 |
64 |
try:
|
67 |
65 |
node = node[name]
|
68 |
66 |
except KeyError as e:
|
69 |
67 |
if not createpath:
|
70 |
|
m = "'{0}': path not found".format(join_path(sep, name_path))
|
|
68 |
m = "{0}: path not found".format(name_path)
|
71 |
69 |
raise KeyError(m)
|
72 |
70 |
node[name] = {}
|
73 |
71 |
node = node[name]
|
74 |
72 |
except IndexError as e:
|
75 |
73 |
if not createpath:
|
76 |
|
m = "'{0}': path not found: {1}".format(
|
77 |
|
join_path(sep, name_path), e)
|
|
74 |
m = "{0}: path not found: {1}".format(name_path, e)
|
78 |
75 |
raise KeyError(m)
|
79 |
76 |
size = name if name > 0 else -name
|
80 |
77 |
node += (dict() for _ in xrange(len(node), size))
|
81 |
78 |
node = node[name]
|
82 |
79 |
except TypeError as e:
|
83 |
|
m = "'{0}': cannot traverse path beyond this node: {1}"
|
84 |
|
m = m.format(join_path(sep, name_path), str(e))
|
|
80 |
m = "{0}: cannot traverse path beyond this node: {1}"
|
|
81 |
m = m.format(name_path, str(e))
|
85 |
82 |
raise ValueError(m)
|
86 |
83 |
node_path.append(node)
|
87 |
84 |
|
... | ... | |
97 |
94 |
yield [name] + names, [node] + nodes
|
98 |
95 |
|
99 |
96 |
|
100 |
|
def list_paths(container, sep='.'):
|
|
97 |
def list_paths(container):
|
101 |
98 |
"""
|
102 |
99 |
>>> sorted(list_paths({'a': {'b': {'c': 'd'}}}))
|
103 |
|
[('a.b.c', 'd')]
|
|
100 |
[(['a', 'b', 'c'], 'd')]
|
104 |
101 |
>>> sorted(list_paths({'a': {'b': {'c': 'd'}, 'e': 3}}))
|
105 |
|
[('a.b.c', 'd'), ('a.e', 3)]
|
|
102 |
[(['a', 'b', 'c'], 'd'), (['a', 'e'], 3)]
|
106 |
103 |
>>> sorted(list_paths({'a': {'b': {'c': 'd'}, 'e': {'f': 3}}}))
|
107 |
|
[('a.b.c', 'd'), ('a.e.f', 3)]
|
|
104 |
[(['a', 'b', 'c'], 'd'), (['a', 'e', 'f'], 3)]
|
108 |
105 |
>>> sorted(list_paths({'a': [{'b': 3}, 2]}))
|
109 |
|
[('a', [{'b': 3}, 2])]
|
|
106 |
[(['a'], [{'b': 3}, 2])]
|
110 |
107 |
>>> list_paths({})
|
111 |
108 |
[]
|
112 |
109 |
|
113 |
110 |
"""
|
114 |
|
return [(join_path(sep, name_path), node_path[-1])
|
|
111 |
return [(name_path, node_path[-1])
|
115 |
112 |
for name_path, node_path in walk_paths(container)]
|
116 |
113 |
|
117 |
114 |
|
118 |
|
def del_path(container, path, sep='.', collect=True):
|
|
115 |
def del_path(container, path, collect=True):
|
119 |
116 |
"""
|
120 |
|
del container['a']['b']['c'] where path=sep.join(['a','b','c'])
|
|
117 |
del container['a']['b']['c'] where path=['a','b','c']
|
121 |
118 |
|
122 |
|
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, 'a.b.c'); d
|
|
119 |
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, ['a', 'b', 'c']); d
|
123 |
120 |
{}
|
124 |
|
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, 'a.b.c', collect=False); d
|
|
121 |
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, ['a', 'b', 'c'],\
|
|
122 |
collect=False); d
|
125 |
123 |
{'a': {'b': {}}}
|
126 |
|
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, 'a.b.c.d')
|
|
124 |
>>> d = {'a': {'b': {'c': 'd'}}}; del_path(d, ['a', 'b', 'c', 'd'])
|
127 |
125 |
Traceback (most recent call last):
|
128 |
|
ValueError: 'a.b.c': cannot traverse path beyond this node:\
|
|
126 |
ValueError: ['a', 'b', 'c']: cannot traverse path beyond this node:\
|
129 |
127 |
'str' object does not support item deletion
|
130 |
128 |
"""
|
131 |
129 |
|
132 |
130 |
name_path, node_path, basename = \
|
133 |
|
lookup_path(container, path, sep=sep, createpath=False)
|
|
131 |
lookup_path(container, path, createpath=False)
|
134 |
132 |
|
135 |
133 |
lastnode = node_path.pop()
|
136 |
|
lastname = basename
|
137 |
134 |
try:
|
138 |
135 |
if basename in lastnode:
|
139 |
136 |
del lastnode[basename]
|
140 |
137 |
except (TypeError, KeyError) as e:
|
141 |
|
m = "'{0}': cannot traverse path beyond this node: {1}"
|
142 |
|
m = m.format(join_path(sep, name_path), str(e))
|
|
138 |
m = "{0}: cannot traverse path beyond this node: {1}"
|
|
139 |
m = m.format(name_path, str(e))
|
143 |
140 |
raise ValueError(m)
|
144 |
141 |
|
145 |
142 |
if collect:
|
... | ... | |
149 |
146 |
del lastnode[basename]
|
150 |
147 |
|
151 |
148 |
|
152 |
|
def get_path(container, path, sep='.'):
|
|
149 |
def get_path(container, path):
|
153 |
150 |
"""
|
154 |
|
return container['a']['b']['c'] where path=sep.join(['a','b','c'])
|
|
151 |
return container['a']['b']['c'] where path=['a','b','c']
|
155 |
152 |
|
156 |
|
>>> get_path({'a': {'b': {'c': 'd'}}}, 'a.b.c.d')
|
|
153 |
>>> get_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'c', 'd'])
|
157 |
154 |
Traceback (most recent call last):
|
158 |
|
ValueError: 'a.b.c.d': cannot traverse path beyond this node:\
|
|
155 |
ValueError: ['a', 'b', 'c', 'd']: cannot traverse path beyond this node:\
|
159 |
156 |
string indices must be integers, not str
|
160 |
|
>>> get_path({'a': {'b': {'c': 1}}}, 'a.b.c.d')
|
|
157 |
>>> get_path({'a': {'b': {'c': 1}}}, ['a', 'b', 'c', 'd'])
|
161 |
158 |
Traceback (most recent call last):
|
162 |
|
ValueError: 'a.b.c.d': cannot traverse path beyond this node:\
|
163 |
|
'int' object is unsubscriptable
|
164 |
|
>>> get_path({'a': {'b': {'c': 1}}}, 'a.b.c')
|
|
159 |
ValueError: ['a', 'b', 'c', 'd']: cannot traverse path beyond this node:\
|
|
160 |
'int' object has no attribute '__getitem__'
|
|
161 |
>>> get_path({'a': {'b': {'c': 1}}}, ['a', 'b', 'c'])
|
165 |
162 |
1
|
166 |
|
>>> get_path({'a': {'b': {'c': 1}}}, 'a.b')
|
|
163 |
>>> get_path({'a': {'b': {'c': 1}}}, ['a', 'b'])
|
167 |
164 |
{'c': 1}
|
168 |
|
>>> get_path({'a': [{'z': 1}]}, 'a.0')
|
|
165 |
>>> get_path({'a': [{'z': 1}]}, ['a', 'b'])
|
|
166 |
Traceback (most recent call last):
|
|
167 |
ValueError: ['a', 'b']: cannot traverse path beyond this node:\
|
|
168 |
list indices must be integers, not str
|
|
169 |
>>> get_path({'a': [{'z': 1}]}, ['a', 0])
|
169 |
170 |
{'z': 1}
|
170 |
|
>>> get_path({'a': [{'z': 1}]}, 'a.0.z')
|
|
171 |
>>> get_path({'a': [{'z': 1}]}, ['a', 1])
|
|
172 |
Traceback (most recent call last):
|
|
173 |
KeyError: "['a', 1]: path not found: list index out of range"
|
|
174 |
>>> get_path({'a': [{'z': 1}]}, ['a', 0, 'z'])
|
171 |
175 |
1
|
172 |
|
>>> get_path({'a': [{'z': 1}]}, 'a.-1.z')
|
|
176 |
>>> get_path({'a': [{'z': 1}]}, ['a', -1, 'z'])
|
173 |
177 |
1
|
174 |
178 |
|
175 |
179 |
"""
|
176 |
180 |
name_path, node_path, basename = \
|
177 |
|
lookup_path(container, path, sep=sep, createpath=False)
|
|
181 |
lookup_path(container, path, createpath=False)
|
178 |
182 |
name_path.append(basename)
|
179 |
183 |
node = node_path[-1]
|
180 |
184 |
|
181 |
185 |
try:
|
182 |
186 |
return node[basename]
|
183 |
187 |
except TypeError as e:
|
184 |
|
m = "'{0}': cannot traverse path beyond this node: {1}"
|
185 |
|
m = m.format(join_path(sep, name_path), str(e))
|
|
188 |
m = "{0}: cannot traverse path beyond this node: {1}"
|
|
189 |
m = m.format(name_path, str(e))
|
186 |
190 |
raise ValueError(m)
|
187 |
191 |
except KeyError as e:
|
188 |
|
m = "'{0}': path not found: {1}"
|
189 |
|
m = m.format(join_path(sep, name_path), str(e))
|
|
192 |
m = "{0}: path not found: {1}"
|
|
193 |
m = m.format(name_path, str(e))
|
|
194 |
raise KeyError(m)
|
|
195 |
except IndexError as e:
|
|
196 |
m = "{0}: path not found: {1}"
|
|
197 |
m = m.format(name_path, str(e))
|
190 |
198 |
raise KeyError(m)
|
191 |
199 |
|
192 |
200 |
|
193 |
|
def set_path(container, path, value, sep='.',
|
194 |
|
createpath=False, overwrite=True):
|
|
201 |
def set_path(container, path, value, createpath=False, overwrite=True):
|
195 |
202 |
"""
|
196 |
|
container['a']['b']['c'] = value where path=sep.join(['a','b','c'])
|
|
203 |
container['a']['b']['c'] = value where path=['a','b','c']
|
197 |
204 |
|
198 |
|
>>> set_path({'a': {'b': {'c': 'd'}}}, 'a.b.c.d', 1)
|
199 |
|
Traceback (most recent call last):
|
200 |
|
ValueError: 'a.b.c.d': cannot index non-object node with string
|
201 |
|
>>> set_path({'a': {'b': {'c': 'd'}}}, 'a.b.x.d', 1)
|
|
205 |
>>> set_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'c', 'd'], 1)
|
202 |
206 |
Traceback (most recent call last):
|
203 |
|
KeyError: "'a.b.x': path not found"
|
204 |
|
>>> set_path({'a': {'b': {'c': 'd'}}}, 'a.b.x.d', 1, createpath=True)
|
205 |
|
|
206 |
|
>>> set_path({'a': {'b': {'c': 'd'}}}, 'a.b.c', 1)
|
207 |
|
|
208 |
|
>>> set_path({'a': {'b': {'c': 'd'}}}, 'a.b.c', 1, overwrite=False)
|
|
207 |
ValueError: ['a', 'b', 'c', 'd']: cannot index, node is neither dict nor\
|
|
208 |
list
|
|
209 |
>>> set_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'x', 'd'], 1)
|
209 |
210 |
Traceback (most recent call last):
|
210 |
|
ValueError: will not overwrite path 'a.b.c'
|
211 |
|
>>> d = {'a': [{'z': 1}]}; set_path(d, 'a.-2.1', 2, createpath=False)
|
|
211 |
KeyError: "['a', 'b', 'x']: path not found"
|
|
212 |
>>> set_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'x', 'd'], 1,\
|
|
213 |
createpath=True)
|
|
214 |
|
|
215 |
>>> set_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'c'], 1)
|
|
216 |
|
|
217 |
>>> set_path({'a': {'b': {'c': 'd'}}}, ['a', 'b', 'c'], 1, overwrite=False)
|
212 |
218 |
Traceback (most recent call last):
|
213 |
|
KeyError: "'a.-2': path not found: list index out of range"
|
214 |
|
>>> d = {'a': [{'z': 1}]}; set_path(d, 'a.-2.1', 2, createpath=True)
|
|
219 |
ValueError: will not overwrite path ['a', 'b', 'c']
|
|
220 |
>>> d = {'a': [{'z': 1}]}; set_path(d, ['a', -2, 1], 2, createpath=False)
|
215 |
221 |
Traceback (most recent call last):
|
216 |
|
ValueError: 'a.-2.1': will not index object node with integer
|
217 |
|
>>> d = {'a': [{'z': 1}]}; set_path(d, 'a.-2.z', 2, createpath=True); \
|
218 |
|
d['a'][-2]['z']
|
|
222 |
KeyError: "['a', -2]: path not found: list index out of range"
|
|
223 |
>>> d = {'a': [{'z': 1}]}; set_path(d, ['a', -2, 1], 2, createpath=True); \
|
|
224 |
d['a'][-2][1]
|
219 |
225 |
2
|
220 |
226 |
|
221 |
227 |
"""
|
222 |
228 |
name_path, node_path, basename = \
|
223 |
|
lookup_path(container, path, sep=sep, createpath=createpath)
|
|
229 |
lookup_path(container, path, createpath=createpath)
|
224 |
230 |
name_path.append(basename)
|
225 |
231 |
node = node_path[-1]
|
226 |
232 |
|
227 |
233 |
if basename in node and not overwrite:
|
228 |
|
m = "will not overwrite path '{0}'".format(path)
|
|
234 |
m = "will not overwrite path {0}".format(path)
|
229 |
235 |
raise ValueError(m)
|
230 |
236 |
|
231 |
237 |
is_object_node = hasattr(node, 'keys')
|
232 |
|
is_string_name = isinstance(basename, basestring)
|
233 |
|
if not is_string_name and is_object_node:
|
234 |
|
m = "'{0}': will not index object node with integer"
|
235 |
|
m = m.format(join_path(sep, name_path))
|
|
238 |
is_list_node = isinstance(node, list)
|
|
239 |
if not is_object_node and not is_list_node:
|
|
240 |
m = "{0}: cannot index, node is neither dict nor list"
|
|
241 |
m = m.format(name_path)
|
236 |
242 |
raise ValueError(m)
|
237 |
|
if is_string_name and not is_object_node:
|
238 |
|
m = "'{0}': cannot index non-object node with string"
|
239 |
|
m = m.format(join_path(sep, name_path))
|
|
243 |
|
|
244 |
is_integer = isinstance(basename, (int, long))
|
|
245 |
if is_list_node and not is_integer:
|
|
246 |
m = "{0}: cannot index list node without an integer"
|
|
247 |
m = m.format(name_path)
|
240 |
248 |
raise ValueError(m)
|
241 |
249 |
try:
|
242 |
250 |
node[basename] = value
|
243 |
251 |
except TypeError as e:
|
244 |
|
m = "'{0}': cannot traverse path beyond this node: {1}"
|
245 |
|
m = m.format(join_path(sep, name_path), str(e))
|
|
252 |
m = "{0}: cannot traverse path beyond this node: {1}"
|
|
253 |
m = m.format(name_path, str(e))
|
246 |
254 |
raise ValueError(m)
|
247 |
255 |
|
248 |
256 |
|