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73 lines
2.1 KiB
73 lines
2.1 KiB
# -*- 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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