97 lines
2.7 KiB
Python
97 lines
2.7 KiB
Python
# -*- 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) 2015 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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"""Create a base class with a metaclass."""
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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.
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class metaclass(type):
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def __new__(cls, name, this_bases, d):
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return meta(name, bases, d)
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return type.__new__(metaclass, 'temporary_class', (), {})
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# Certain versions of pypy have a bug where clearing the exception stack
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# breaks the __exit__ function in a very peculiar way. The second level of
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# exception blocks is necessary because pypy seems to forget to check if an
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# exception happened until the next bytecode instruction?
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#
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# Relevant PyPy bugfix commit:
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# https://bitbucket.org/pypy/pypy/commits/77ecf91c635a287e88e60d8ddb0f4e9df4003301
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# According to ronan on #pypy IRC, it is released in PyPy2 2.3 and later
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# versions.
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#
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# Ubuntu 14.04 has PyPy 2.2.1, which does exhibit this bug.
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BROKEN_PYPY_CTXMGR_EXIT = False
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if hasattr(sys, 'pypy_version_info'):
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class _Mgr(object):
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def __enter__(self):
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return self
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def __exit__(self, *args):
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if hasattr(sys, 'exc_clear'):
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# Python 3 (PyPy3) doesn't have exc_clear
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sys.exc_clear()
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try:
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try:
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with _Mgr():
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raise AssertionError()
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except:
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raise
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except TypeError:
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BROKEN_PYPY_CTXMGR_EXIT = True
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except AssertionError:
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pass
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