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- # -*- coding: utf-8 -*-
- """
- flask._compat
- ~~~~~~~~~~~~~
- Some py2/py3 compatibility support based on a stripped down
- version of six so we don't have to depend on a specific version
- of it.
- :copyright: (c) 2013 by Armin Ronacher.
- :license: BSD, see LICENSE for more details.
- """
- import sys
- PY2 = sys.version_info[0] == 2
- _identity = lambda x: x
- if not PY2:
- text_type = str
- string_types = (str,)
- integer_types = (int, )
- iterkeys = lambda d: iter(d.keys())
- itervalues = lambda d: iter(d.values())
- iteritems = lambda d: iter(d.items())
- from io import StringIO
- def reraise(tp, value, tb=None):
- if value.__traceback__ is not tb:
- raise value.with_traceback(tb)
- raise value
- implements_to_string = _identity
- else:
- text_type = unicode
- string_types = (str, unicode)
- integer_types = (int, long)
- iterkeys = lambda d: d.iterkeys()
- itervalues = lambda d: d.itervalues()
- iteritems = lambda d: d.iteritems()
- from cStringIO import StringIO
- exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')
- def implements_to_string(cls):
- cls.__unicode__ = cls.__str__
- cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
- return cls
- def with_metaclass(meta, *bases):
- # This requires a bit of explanation: the basic idea is to make a
- # dummy metaclass for one level of class instantiation that replaces
- # itself with the actual metaclass. Because of internal type checks
- # we also need to make sure that we downgrade the custom metaclass
- # for one level to something closer to type (that's why __call__ and
- # __init__ comes back from type etc.).
- #
- # This has the advantage over six.with_metaclass in that it does not
- # introduce dummy classes into the final MRO.
- class metaclass(meta):
- __call__ = type.__call__
- __init__ = type.__init__
- def __new__(cls, name, this_bases, d):
- if this_bases is None:
- return type.__new__(cls, name, (), d)
- return meta(name, bases, d)
- return metaclass('temporary_class', None, {})
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