Current File : //opt/alt/python35/lib/python3.5/site-packages/cerberus/utils.py
from __future__ import absolute_import
from collections import Mapping, Sequence
from cerberus.platform import _int_types, _str_type
def compare_paths_lt(x, y):
for i in range(min(len(x), len(y))):
if isinstance(x[i], type(y[i])):
if x[i] != y[i]:
return x[i] < y[i]
elif isinstance(x[i], _int_types):
return True
elif isinstance(y[i], _int_types):
return False
return len(x) < len(y)
def drop_item_from_tuple(t, i):
return t[:i] + t[i + 1:]
def get_Validator_class():
global Validator
if 'Validator' not in globals():
from cerberus.validator import Validator
return Validator
def mapping_hash(schema):
return hash(mapping_to_frozenset(schema))
def mapping_to_frozenset(mapping):
""" Be aware that this treats any sequence type with the equal members as
equal. As it is used to identify equality of schemas, this can be
considered okay as definitions are semantically equal regardless the
container type. """
mapping = mapping.copy()
for key, value in mapping.items():
if isinstance(value, Mapping):
mapping[key] = mapping_to_frozenset(value)
elif isinstance(value, Sequence):
value = list(value)
for i, item in enumerate(value):
if isinstance(item, Mapping):
value[i] = mapping_to_frozenset(item)
mapping[key] = tuple(value)
return frozenset(mapping.items())
def isclass(obj):
try:
issubclass(obj, object)
except TypeError:
return False
else:
return True
def quote_string(value):
if isinstance(value, _str_type):
return '"%s"' % value
else:
return value
def validator_factory(name, mixin=None, class_dict={}):
""" Dynamically create a :class:`~cerberus.Validator` subclass.
Docstrings of mixin-classes will be added to the resulting
class' one if ``__doc__`` is not in :obj:`class_dict`.
:param name: The name of the new class.
:type name: :class:`str`
:param mixin: Class(es) with mixin-methods.
:type mixin: :class:`tuple` of or a single :term:`class`
:param class_dict: Attributes for the new class.
:type class_dict: :class:`dict`
:return: The created class.
"""
Validator = get_Validator_class()
if mixin is None:
bases = (Validator,)
elif isinstance(mixin, tuple):
bases = (Validator,) + mixin
else:
bases = (Validator, mixin)
docstrings = [x.__doc__ for x in bases if x.__doc__]
if len(docstrings) > 1 and '__doc__' not in class_dict:
class_dict.update({'__doc__': '\n'.join(docstrings)})
return type(name, bases, class_dict)
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