build test

venv/lib/python3.7/site-packages/flask/_compat.py

@@ -0,0 +1,145 @@
+# -*- 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: 2010 Pallets
+    :license: BSD-3-Clause
+"""
+import sys
+
+PY2 = sys.version_info[0] == 2
+_identity = lambda x: x
+
+try:  # Python 2
+    text_type = unicode
+    string_types = (str, unicode)
+    integer_types = (int, long)
+except NameError:  # Python 3
+    text_type = str
+    string_types = (str,)
+    integer_types = (int,)
+
+if not PY2:
+    iterkeys = lambda d: iter(d.keys())
+    itervalues = lambda d: iter(d.values())
+    iteritems = lambda d: iter(d.items())
+
+    from inspect import getfullargspec as getargspec
+    from io import StringIO
+    import collections.abc as collections_abc
+
+    def reraise(tp, value, tb=None):
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+
+    implements_to_string = _identity
+
+else:
+    iterkeys = lambda d: d.iterkeys()
+    itervalues = lambda d: d.itervalues()
+    iteritems = lambda d: d.iteritems()
+
+    from inspect import getargspec
+    from cStringIO import StringIO
+    import collections as collections_abc
+
+    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):
+    """Create a base class with a metaclass."""
+    # 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.
+    class metaclass(type):
+        def __new__(metacls, name, this_bases, d):
+            return meta(name, bases, d)
+
+    return type.__new__(metaclass, "temporary_class", (), {})
+
+
+# Certain versions of pypy have a bug where clearing the exception stack
+# breaks the __exit__ function in a very peculiar way.  The second level of
+# exception blocks is necessary because pypy seems to forget to check if an
+# exception happened until the next bytecode instruction?
+#
+# Relevant PyPy bugfix commit:
+# https://bitbucket.org/pypy/pypy/commits/77ecf91c635a287e88e60d8ddb0f4e9df4003301
+# According to ronan on #pypy IRC, it is released in PyPy2 2.3 and later
+# versions.
+#
+# Ubuntu 14.04 has PyPy 2.2.1, which does exhibit this bug.
+BROKEN_PYPY_CTXMGR_EXIT = False
+if hasattr(sys, "pypy_version_info"):
+
+    class _Mgr(object):
+        def __enter__(self):
+            return self
+
+        def __exit__(self, *args):
+            if hasattr(sys, "exc_clear"):
+                # Python 3 (PyPy3) doesn't have exc_clear
+                sys.exc_clear()
+
+    try:
+        try:
+            with _Mgr():
+                raise AssertionError()
+        except:  # noqa: B001
+            # We intentionally use a bare except here. See the comment above
+            # regarding a pypy bug as to why.
+            raise
+    except TypeError:
+        BROKEN_PYPY_CTXMGR_EXIT = True
+    except AssertionError:
+        pass
+
+
+try:
+    from os import fspath
+except ImportError:
+    # Backwards compatibility as proposed in PEP 0519:
+    # https://www.python.org/dev/peps/pep-0519/#backwards-compatibility
+    def fspath(path):
+        return path.__fspath__() if hasattr(path, "__fspath__") else path
+
+
+class _DeprecatedBool(object):
+    def __init__(self, name, version, value):
+        self.message = "'{}' is deprecated and will be removed in version {}.".format(
+            name, version
+        )
+        self.value = value
+
+    def _warn(self):
+        import warnings
+
+        warnings.warn(self.message, DeprecationWarning, stacklevel=2)
+
+    def __eq__(self, other):
+        self._warn()
+        return other == self.value
+
+    def __ne__(self, other):
+        self._warn()
+        return other != self.value
+
+    def __bool__(self):
+        self._warn()
+        return self.value
+
+    __nonzero__ = __bool__
+
+
+json_available = _DeprecatedBool("flask.json_available", "2.0.0", True)