1 files changed, 270 insertions, 0 deletions
diff --git a/vicn/core/sa_compat.py b/vicn/core/sa_compat.py
new file mode 100644
index 00000000..34211455
--- /dev/null
+++ b/vicn/core/sa_compat.py
@@ -0,0 +1,270 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# This module originates from SQLAlchemy
+#
+# util/compat.py
+# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+#
+
+"""Handle Python version/platform incompatibilities."""
+
+import sys
+
+try:
+    import threading
+except ImportError:
+    import dummy_threading as threading
+
+py36 = sys.version_info >= (3, 6)
+py33 = sys.version_info >= (3, 3)
+py32 = sys.version_info >= (3, 2)
+py3k = sys.version_info >= (3, 0)
+py2k = sys.version_info < (3, 0)
+py265 = sys.version_info >= (2, 6, 5)
+jython = sys.platform.startswith('java')
+pypy = hasattr(sys, 'pypy_version_info')
+win32 = sys.platform.startswith('win')
+cpython = not pypy and not jython  # TODO: something better for this ?
+
+import collections
+next = next
+
+if py3k:
+    import pickle
+else:
+    try:
+        import cPickle as pickle
+    except ImportError:
+        import pickle
+
+# work around http://bugs.python.org/issue2646
+if py265:
+    safe_kwarg = lambda arg: arg
+else:
+    safe_kwarg = str
+
+ArgSpec = collections.namedtuple("ArgSpec",
+                                 ["args", "varargs", "keywords", "defaults"])
+
+if py3k:
+    import builtins
+
+    from inspect import getfullargspec as inspect_getfullargspec
+    from urllib.parse import (quote_plus, unquote_plus,
+                              parse_qsl, quote, unquote)
+    import configparser
+    from io import StringIO
+
+    from io import BytesIO as byte_buffer
+
+    def inspect_getargspec(func):
+        return ArgSpec(
+            *inspect_getfullargspec(func)[0:4]
+        )
+
+    string_types = str,
+    binary_types = bytes,
+    binary_type = bytes
+    text_type = str
+    int_types = int,
+    iterbytes = iter
+
+    def u(s):
+        return s
+
+    def ue(s):
+        return s
+
+    def b(s):
+        return s.encode("latin-1")
+
+    if py32:
+        callable = callable
+    else:
+        def callable(fn):
+            return hasattr(fn, '__call__')
+
+    def cmp(a, b):
+        return (a > b) - (a < b)
+
+    from functools import reduce
+
+    print_ = getattr(builtins, "print")
+
+    import_ = getattr(builtins, '__import__')
+
+    import itertools
+    itertools_filterfalse = itertools.filterfalse
+    itertools_filter = filter
+    itertools_imap = map
+    from itertools import zip_longest
+
+    import base64
+
+    def b64encode(x):
+        return base64.b64encode(x).decode('ascii')
+
+    def b64decode(x):
+        return base64.b64decode(x.encode('ascii'))
+
+else:
+    from inspect import getargspec as inspect_getfullargspec
+    inspect_getargspec = inspect_getfullargspec
+    from urllib import quote_plus, unquote_plus, quote, unquote
+    from urlparse import parse_qsl
+    import ConfigParser as configparser
+    from StringIO import StringIO
+    from cStringIO import StringIO as byte_buffer
+
+    string_types = basestring,
+    binary_types = bytes,
+    binary_type = str
+    text_type = unicode
+    int_types = int, long
+
+    def iterbytes(buf):
+        return (ord(byte) for byte in buf)
+
+    def u(s):
+        # this differs from what six does, which doesn't support non-ASCII
+        # strings - we only use u() with
+        # literal source strings, and all our source files with non-ascii
+        # in them (all are tests) are utf-8 encoded.
+        return unicode(s, "utf-8")
+
+    def ue(s):
+        return unicode(s, "unicode_escape")
+
+    def b(s):
+        return s
+
+    def import_(*args):
+        if len(args) == 4:
+            args = args[0:3] + ([str(arg) for arg in args[3]],)
+        return __import__(*args)
+
+    callable = callable
+    cmp = cmp
+    reduce = reduce
+
+    import base64
+    b64encode = base64.b64encode
+    b64decode = base64.b64decode
+
+    def print_(*args, **kwargs):
+        fp = kwargs.pop("file", sys.stdout)
+        if fp is None:
+            return
+        for arg in enumerate(args):
+            if not isinstance(arg, basestring):
+                arg = str(arg)
+            fp.write(arg)
+
+    import itertools
+    itertools_filterfalse = itertools.ifilterfalse
+    itertools_filter = itertools.ifilter
+    itertools_imap = itertools.imap
+    from itertools import izip_longest as zip_longest
+
+
+import time
+if win32 or jython:
+    time_func = time.clock
+else:
+    time_func = time.time
+
+from collections import namedtuple
+from operator import attrgetter as dottedgetter
+
+
+if py3k:
+    def reraise(tp, value, tb=None, cause=None):
+        if cause is not None:
+            assert cause is not value, "Same cause emitted"
+            value.__cause__ = cause
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+
+else:
+    # not as nice as that of Py3K, but at least preserves
+    # the code line where the issue occurred
+    exec("def reraise(tp, value, tb=None, cause=None):\n"
+         "    if cause is not None:\n"
+         "        assert cause is not value, 'Same cause emitted'\n"
+         "    raise tp, value, tb\n")
+
+
+def raise_from_cause(exception, exc_info=None):
+    if exc_info is None:
+        exc_info = sys.exc_info()
+    exc_type, exc_value, exc_tb = exc_info
+    cause = exc_value if exc_value is not exception else None
+    reraise(type(exception), exception, tb=exc_tb, cause=cause)
+
+if py3k:
+    exec_ = getattr(builtins, 'exec')
+else:
+    def exec_(func_text, globals_, lcl=None):
+        if lcl is None:
+            exec('exec func_text in globals_')
+        else:
+            exec('exec func_text in globals_, lcl')
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass.
+
+    Drops the middle class upon creation.
+
+    Source: http://lucumr.pocoo.org/2013/5/21/porting-to-python-3-redux/
+
+    """
+
+    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, {})
+
+
+from contextlib import contextmanager
+
+try:
+    from contextlib import nested
+except ImportError:
+    # removed in py3k, credit to mitsuhiko for
+    # workaround
+
+    @contextmanager
+    def nested(*managers):
+        exits = []
+        vars = []
+        exc = (None, None, None)
+        try:
+            for mgr in managers:
+                exit = mgr.__exit__
+                enter = mgr.__enter__
+                vars.append(enter())
+                exits.append(exit)
+            yield vars
+        except:
+            exc = sys.exc_info()
+        finally:
+            while exits:
+                exit = exits.pop()
+                try:
+                    if exit(*exc):
+                        exc = (None, None, None)
+                except:
+                    exc = sys.exc_info()
+            if exc != (None, None, None):
+                reraise(exc[0], exc[1], exc[2])