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# -*- coding: utf-8 -*-
# Copyright (c) 2010 Mark Sandstrom
# Copyright (c) 2011 Raphaël Barrois
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#: String for splitting an attribute name into a
#: (subfactory_name, subfactory_field) tuple.
ATTR_SPLITTER = '__'
def extract_dict(prefix, kwargs, pop=True, exclude=()):
"""Extracts all values beginning with a given prefix from a dict.
Can either 'pop' or 'get' them;
Args:
prefix (str): the prefix to use for lookups
kwargs (dict): the dict from which values should be extracted
pop (bool): whether to use pop (True) or get (False)
exclude (iterable): list of prefixed keys that shouldn't be extracted
Returns:
A new dict, containing values from kwargs and beginning with
prefix + ATTR_SPLITTER. That full prefix is removed from the keys
of the returned dict.
"""
prefix = prefix + ATTR_SPLITTER
extracted = {}
for key in kwargs.keys():
if key in exclude:
continue
if key.startswith(prefix):
new_key = key[len(prefix):]
if pop:
value = kwargs.pop(key)
else:
value = kwargs[key]
extracted[new_key] = value
return extracted
def declength_compare(a, b):
"""Compare objects, choosing longest first."""
if len(a) > len(b):
return -1
elif len(a) < len(b):
return 1
else:
return cmp(a, b)
def multi_extract_dict(prefixes, kwargs, pop=True, exclude=()):
"""Extracts all values from a given list of prefixes.
Arguments have the same meaning as for extract_dict.
Returns:
dict(str => dict): a dict mapping each prefix to the dict of extracted
key/value.
"""
results = {}
exclude = list(exclude)
for prefix in sorted(prefixes, cmp=declength_compare):
extracted = extract_dict(prefix, kwargs, pop=pop, exclude=exclude)
results[prefix] = extracted
exclude.extend(
['%s%s%s' % (prefix, ATTR_SPLITTER, key) for key in extracted])
return results
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