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