|
|
# coding: utf-8
|
|
|
"""Compatibility tricks for Python 3. Mainly to do with unicode."""
|
|
|
import functools
|
|
|
import os
|
|
|
import sys
|
|
|
import re
|
|
|
import shutil
|
|
|
import types
|
|
|
|
|
|
from .encoding import DEFAULT_ENCODING
|
|
|
|
|
|
def no_code(x, encoding=None):
|
|
|
return x
|
|
|
|
|
|
def decode(s, encoding=None):
|
|
|
encoding = encoding or DEFAULT_ENCODING
|
|
|
return s.decode(encoding, "replace")
|
|
|
|
|
|
def encode(u, encoding=None):
|
|
|
encoding = encoding or DEFAULT_ENCODING
|
|
|
return u.encode(encoding, "replace")
|
|
|
|
|
|
|
|
|
def cast_unicode(s, encoding=None):
|
|
|
if isinstance(s, bytes):
|
|
|
return decode(s, encoding)
|
|
|
return s
|
|
|
|
|
|
def cast_bytes(s, encoding=None):
|
|
|
if not isinstance(s, bytes):
|
|
|
return encode(s, encoding)
|
|
|
return s
|
|
|
|
|
|
def buffer_to_bytes(buf):
|
|
|
"""Cast a buffer object to bytes"""
|
|
|
if not isinstance(buf, bytes):
|
|
|
buf = bytes(buf)
|
|
|
return buf
|
|
|
|
|
|
def _modify_str_or_docstring(str_change_func):
|
|
|
@functools.wraps(str_change_func)
|
|
|
def wrapper(func_or_str):
|
|
|
if isinstance(func_or_str, string_types):
|
|
|
func = None
|
|
|
doc = func_or_str
|
|
|
else:
|
|
|
func = func_or_str
|
|
|
doc = func.__doc__
|
|
|
|
|
|
doc = str_change_func(doc)
|
|
|
|
|
|
if func:
|
|
|
func.__doc__ = doc
|
|
|
return func
|
|
|
return doc
|
|
|
return wrapper
|
|
|
|
|
|
def safe_unicode(e):
|
|
|
"""unicode(e) with various fallbacks. Used for exceptions, which may not be
|
|
|
safe to call unicode() on.
|
|
|
"""
|
|
|
try:
|
|
|
return unicode_type(e)
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
try:
|
|
|
return str_to_unicode(str(e))
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
try:
|
|
|
return str_to_unicode(repr(e))
|
|
|
except UnicodeError:
|
|
|
pass
|
|
|
|
|
|
return u'Unrecoverably corrupt evalue'
|
|
|
|
|
|
# shutil.which from Python 3.4
|
|
|
def _shutil_which(cmd, mode=os.F_OK | os.X_OK, path=None):
|
|
|
"""Given a command, mode, and a PATH string, return the path which
|
|
|
conforms to the given mode on the PATH, or None if there is no such
|
|
|
file.
|
|
|
|
|
|
`mode` defaults to os.F_OK | os.X_OK. `path` defaults to the result
|
|
|
of os.environ.get("PATH"), or can be overridden with a custom search
|
|
|
path.
|
|
|
|
|
|
This is a backport of shutil.which from Python 3.4
|
|
|
"""
|
|
|
# Check that a given file can be accessed with the correct mode.
|
|
|
# Additionally check that `file` is not a directory, as on Windows
|
|
|
# directories pass the os.access check.
|
|
|
def _access_check(fn, mode):
|
|
|
return (os.path.exists(fn) and os.access(fn, mode)
|
|
|
and not os.path.isdir(fn))
|
|
|
|
|
|
# If we're given a path with a directory part, look it up directly rather
|
|
|
# than referring to PATH directories. This includes checking relative to the
|
|
|
# current directory, e.g. ./script
|
|
|
if os.path.dirname(cmd):
|
|
|
if _access_check(cmd, mode):
|
|
|
return cmd
|
|
|
return None
|
|
|
|
|
|
if path is None:
|
|
|
path = os.environ.get("PATH", os.defpath)
|
|
|
if not path:
|
|
|
return None
|
|
|
path = path.split(os.pathsep)
|
|
|
|
|
|
if sys.platform == "win32":
|
|
|
# The current directory takes precedence on Windows.
|
|
|
if not os.curdir in path:
|
|
|
path.insert(0, os.curdir)
|
|
|
|
|
|
# PATHEXT is necessary to check on Windows.
|
|
|
pathext = os.environ.get("PATHEXT", "").split(os.pathsep)
|
|
|
# See if the given file matches any of the expected path extensions.
|
|
|
# This will allow us to short circuit when given "python.exe".
|
|
|
# If it does match, only test that one, otherwise we have to try
|
|
|
# others.
|
|
|
if any(cmd.lower().endswith(ext.lower()) for ext in pathext):
|
|
|
files = [cmd]
|
|
|
else:
|
|
|
files = [cmd + ext for ext in pathext]
|
|
|
else:
|
|
|
# On other platforms you don't have things like PATHEXT to tell you
|
|
|
# what file suffixes are executable, so just pass on cmd as-is.
|
|
|
files = [cmd]
|
|
|
|
|
|
seen = set()
|
|
|
for dir in path:
|
|
|
normdir = os.path.normcase(dir)
|
|
|
if not normdir in seen:
|
|
|
seen.add(normdir)
|
|
|
for thefile in files:
|
|
|
name = os.path.join(dir, thefile)
|
|
|
if _access_check(name, mode):
|
|
|
return name
|
|
|
return None
|
|
|
|
|
|
if sys.version_info[0] >= 3:
|
|
|
PY3 = True
|
|
|
|
|
|
# keep reference to builtin_mod because the kernel overrides that value
|
|
|
# to forward requests to a frontend.
|
|
|
def input(prompt=''):
|
|
|
return builtin_mod.input(prompt)
|
|
|
|
|
|
builtin_mod_name = "builtins"
|
|
|
import builtins as builtin_mod
|
|
|
|
|
|
str_to_unicode = no_code
|
|
|
unicode_to_str = no_code
|
|
|
str_to_bytes = encode
|
|
|
bytes_to_str = decode
|
|
|
cast_bytes_py2 = no_code
|
|
|
cast_unicode_py2 = no_code
|
|
|
buffer_to_bytes_py2 = no_code
|
|
|
|
|
|
string_types = (str,)
|
|
|
unicode_type = str
|
|
|
|
|
|
which = shutil.which
|
|
|
|
|
|
def isidentifier(s, dotted=False):
|
|
|
if dotted:
|
|
|
return all(isidentifier(a) for a in s.split("."))
|
|
|
return s.isidentifier()
|
|
|
|
|
|
xrange = range
|
|
|
def iteritems(d): return iter(d.items())
|
|
|
def itervalues(d): return iter(d.values())
|
|
|
getcwd = os.getcwd
|
|
|
|
|
|
MethodType = types.MethodType
|
|
|
|
|
|
def execfile(fname, glob, loc=None, compiler=None):
|
|
|
loc = loc if (loc is not None) else glob
|
|
|
with open(fname, 'rb') as f:
|
|
|
compiler = compiler or compile
|
|
|
exec(compiler(f.read(), fname, 'exec'), glob, loc)
|
|
|
|
|
|
# Refactor print statements in doctests.
|
|
|
_print_statement_re = re.compile(r"\bprint (?P<expr>.*)$", re.MULTILINE)
|
|
|
def _print_statement_sub(match):
|
|
|
expr = match.groups('expr')
|
|
|
return "print(%s)" % expr
|
|
|
|
|
|
@_modify_str_or_docstring
|
|
|
def doctest_refactor_print(doc):
|
|
|
"""Refactor 'print x' statements in a doctest to print(x) style. 2to3
|
|
|
unfortunately doesn't pick up on our doctests.
|
|
|
|
|
|
Can accept a string or a function, so it can be used as a decorator."""
|
|
|
return _print_statement_re.sub(_print_statement_sub, doc)
|
|
|
|
|
|
# Abstract u'abc' syntax:
|
|
|
@_modify_str_or_docstring
|
|
|
def u_format(s):
|
|
|
""""{u}'abc'" --> "'abc'" (Python 3)
|
|
|
|
|
|
Accepts a string or a function, so it can be used as a decorator."""
|
|
|
return s.format(u='')
|
|
|
|
|
|
def get_closure(f):
|
|
|
"""Get a function's closure attribute"""
|
|
|
return f.__closure__
|
|
|
|
|
|
else:
|
|
|
PY3 = False
|
|
|
|
|
|
# keep reference to builtin_mod because the kernel overrides that value
|
|
|
# to forward requests to a frontend.
|
|
|
def input(prompt=''):
|
|
|
return builtin_mod.raw_input(prompt)
|
|
|
|
|
|
builtin_mod_name = "__builtin__"
|
|
|
import __builtin__ as builtin_mod
|
|
|
|
|
|
str_to_unicode = decode
|
|
|
unicode_to_str = encode
|
|
|
str_to_bytes = no_code
|
|
|
bytes_to_str = no_code
|
|
|
cast_bytes_py2 = cast_bytes
|
|
|
cast_unicode_py2 = cast_unicode
|
|
|
buffer_to_bytes_py2 = buffer_to_bytes
|
|
|
|
|
|
string_types = (str, unicode)
|
|
|
unicode_type = unicode
|
|
|
|
|
|
import re
|
|
|
_name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
|
|
|
def isidentifier(s, dotted=False):
|
|
|
if dotted:
|
|
|
return all(isidentifier(a) for a in s.split("."))
|
|
|
return bool(_name_re.match(s))
|
|
|
|
|
|
xrange = xrange
|
|
|
def iteritems(d): return d.iteritems()
|
|
|
def itervalues(d): return d.itervalues()
|
|
|
getcwd = os.getcwdu
|
|
|
|
|
|
def MethodType(func, instance):
|
|
|
return types.MethodType(func, instance, type(instance))
|
|
|
|
|
|
def doctest_refactor_print(func_or_str):
|
|
|
return func_or_str
|
|
|
|
|
|
def get_closure(f):
|
|
|
"""Get a function's closure attribute"""
|
|
|
return f.func_closure
|
|
|
|
|
|
which = _shutil_which
|
|
|
|
|
|
# Abstract u'abc' syntax:
|
|
|
@_modify_str_or_docstring
|
|
|
def u_format(s):
|
|
|
""""{u}'abc'" --> "u'abc'" (Python 2)
|
|
|
|
|
|
Accepts a string or a function, so it can be used as a decorator."""
|
|
|
return s.format(u='u')
|
|
|
|
|
|
if sys.platform == 'win32':
|
|
|
def execfile(fname, glob=None, loc=None, compiler=None):
|
|
|
loc = loc if (loc is not None) else glob
|
|
|
scripttext = builtin_mod.open(fname).read()+ '\n'
|
|
|
# compile converts unicode filename to str assuming
|
|
|
# ascii. Let's do the conversion before calling compile
|
|
|
if isinstance(fname, unicode):
|
|
|
filename = unicode_to_str(fname)
|
|
|
else:
|
|
|
filename = fname
|
|
|
compiler = compiler or compile
|
|
|
exec(compiler(scripttext, filename, 'exec'), glob, loc)
|
|
|
|
|
|
else:
|
|
|
def execfile(fname, glob=None, loc=None, compiler=None):
|
|
|
if isinstance(fname, unicode):
|
|
|
filename = fname.encode(sys.getfilesystemencoding())
|
|
|
else:
|
|
|
filename = fname
|
|
|
where = [ns for ns in [glob, loc] if ns is not None]
|
|
|
if compiler is None:
|
|
|
builtin_mod.execfile(filename, *where)
|
|
|
else:
|
|
|
scripttext = builtin_mod.open(fname).read().rstrip() + '\n'
|
|
|
exec(compiler(scripttext, filename, 'exec'), glob, loc)
|
|
|
|
|
|
|
|
|
PY2 = not PY3
|
|
|
|
|
|
|
|
|
def annotate(**kwargs):
|
|
|
"""Python 3 compatible function annotation for Python 2."""
|
|
|
if not kwargs:
|
|
|
raise ValueError('annotations must be provided as keyword arguments')
|
|
|
def dec(f):
|
|
|
if hasattr(f, '__annotations__'):
|
|
|
for k, v in kwargs.items():
|
|
|
f.__annotations__[k] = v
|
|
|
else:
|
|
|
f.__annotations__ = kwargs
|
|
|
return f
|
|
|
return dec
|
|
|
|
|
|
|
|
|
# Parts below taken from six:
|
|
|
# Copyright (c) 2010-2013 Benjamin Peterson
|
|
|
#
|
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
|
# in the Software without restriction, including without limitation the rights
|
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
|
# furnished to do so, subject to the following conditions:
|
|
|
#
|
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
|
# copies or substantial portions of the Software.
|
|
|
#
|
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
|
# SOFTWARE.
|
|
|
|
|
|
def with_metaclass(meta, *bases):
|
|
|
"""Create a base class with a metaclass."""
|
|
|
return meta("_NewBase", bases, {})
|
|
|
|
