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import io
import sys
from sqlalchemy import __version__ as sa_version
if sys.version_info < (2, 6):
raise NotImplementedError("Python 2.6 or greater is required.")
sqla_08 = sa_version >= '0.8.0'
sqla_09 = sa_version >= '0.9.0'
py27 = sys.version_info >= (2, 7)
py2k = sys.version_info < (3, 0)
py3k = sys.version_info >= (3, 0)
py33 = sys.version_info >= (3, 3)
if py3k:
from io import StringIO
else:
# accepts strings
from StringIO import StringIO
if py3k:
import builtins as compat_builtins
string_types = str,
binary_type = bytes
text_type = str
def callable(fn):
return hasattr(fn, '__call__')
def u(s):
return s
def ue(s):
return s
range = range
else:
import __builtin__ as compat_builtins
string_types = basestring,
binary_type = str
text_type = unicode
callable = callable
def u(s):
return unicode(s, "utf-8")
def ue(s):
return unicode(s, "unicode_escape")
range = xrange
if py3k:
from configparser import ConfigParser as SafeConfigParser
import configparser
else:
from ConfigParser import SafeConfigParser
import ConfigParser as configparser
if py2k:
from mako.util import parse_encoding
if py33:
from importlib import machinery
def load_module_py(module_id, path):
return machinery.SourceFileLoader(
module_id, path).load_module(module_id)
def load_module_pyc(module_id, path):
return machinery.SourcelessFileLoader(
module_id, path).load_module(module_id)
else:
import imp
def load_module_py(module_id, path):
with open(path, 'rb') as fp:
mod = imp.load_source(module_id, path, fp)
if py2k:
source_encoding = parse_encoding(fp)
if source_encoding:
mod._alembic_source_encoding = source_encoding
return mod
def load_module_pyc(module_id, path):
with open(path, 'rb') as fp:
mod = imp.load_compiled(module_id, path, fp)
# no source encoding here
return mod
try:
exec_ = getattr(compat_builtins, 'exec')
except AttributeError:
# Python 2
def exec_(func_text, globals_, lcl):
exec('exec func_text in globals_, lcl')
################################################
# cross-compatible metaclass implementation
# Copyright (c) 2010-2012 Benjamin Peterson
def with_metaclass(meta, base=object):
"""Create a base class with a metaclass."""
return meta("%sBase" % meta.__name__, (base,), {})
################################################
if py3k:
def reraise(tp, value, tb=None, cause=None):
if cause is not None:
value.__cause__ = cause
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
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
reraise(type(exception), exception, tb=exc_tb, cause=exc_value)
else:
exec("def reraise(tp, value, tb=None, cause=None):\n"
" raise tp, value, tb\n")
def raise_from_cause(exception, exc_info=None):
# not as nice as that of Py3K, but at least preserv
# the code line where the issue occurred
if exc_info is None:
exc_info = sys.exc_info()
exc_type, exc_value, exc_tb = exc_info
reraise(type(exception), exception, tb=exc_tb)
if py3k:
def reraise(tp, value, tb=None, cause=None):
if cause is not None:
value.__cause__ = cause
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
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
reraise(type(exception), exception, tb=exc_tb, cause=exc_value)
else:
exec("def reraise(tp, value, tb=None, cause=None):\n"
" raise tp, value, tb\n")
def raise_from_cause(exception, exc_info=None):
# not as nice as that of Py3K, but at least preserves
# the code line where the issue occurred
if exc_info is None:
exc_info = sys.exc_info()
exc_type, exc_value, exc_tb = exc_info
reraise(type(exception), exception, tb=exc_tb)
# produce a wrapper that allows encoded text to stream
# into a given buffer, but doesn't close it.
# not sure of a more idiomatic approach to this.
class EncodedIO(io.TextIOWrapper):
def close(self):
pass
if py2k:
# in Py2K, the io.* package is awkward because it does not
# easily wrap the file type (e.g. sys.stdout) and I can't
# figure out at all how to wrap StringIO.StringIO (used by nosetests)
# and also might be user specified too. So create a full
# adapter.
class ActLikePy3kIO(object):
"""Produce an object capable of wrapping either
sys.stdout (e.g. file) *or* StringIO.StringIO().
"""
def _false(self):
return False
def _true(self):
return True
readable = seekable = _false
writable = _true
closed = False
def __init__(self, file_):
self.file_ = file_
def write(self, text):
return self.file_.write(text)
def flush(self):
return self.file_.flush()
class EncodedIO(EncodedIO):
def __init__(self, file_, encoding):
super(EncodedIO, self).__init__(
ActLikePy3kIO(file_), encoding=encoding)
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