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# coding: utf-8
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"""Compatibility tricks for Python 3. Mainly to do with unicode."""
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import __builtin__
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import functools
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import sys
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import re
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import types
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from .encoding import DEFAULT_ENCODING
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orig_open = open
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def no_code(x, encoding=None):
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return x
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def decode(s, encoding=None):
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encoding = encoding or DEFAULT_ENCODING
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return s.decode(encoding, "replace")
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def encode(u, encoding=None):
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encoding = encoding or DEFAULT_ENCODING
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return u.encode(encoding, "replace")
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def cast_unicode(s, encoding=None):
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if isinstance(s, bytes):
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return decode(s, encoding)
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return s
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def cast_bytes(s, encoding=None):
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if not isinstance(s, bytes):
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return encode(s, encoding)
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return s
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def _modify_str_or_docstring(str_change_func):
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@functools.wraps(str_change_func)
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def wrapper(func_or_str):
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if isinstance(func_or_str, basestring):
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func = None
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doc = func_or_str
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else:
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func = func_or_str
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doc = func.__doc__
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doc = str_change_func(doc)
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if func:
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func.__doc__ = doc
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return func
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return doc
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return wrapper
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if sys.version_info[0] >= 3:
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PY3 = True
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input = input
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builtin_mod_name = "builtins"
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str_to_unicode = no_code
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unicode_to_str = no_code
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str_to_bytes = encode
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bytes_to_str = decode
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cast_bytes_py2 = no_code
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def isidentifier(s, dotted=False):
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if dotted:
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return all(isidentifier(a) for a in s.split("."))
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return s.isidentifier()
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open = orig_open
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MethodType = types.MethodType
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def execfile(fname, glob, loc=None):
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loc = loc if (loc is not None) else glob
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exec compile(open(fname, 'rb').read(), fname, 'exec') in glob, loc
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# Refactor print statements in doctests.
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_print_statement_re = re.compile(r"\bprint (?P<expr>.*)$", re.MULTILINE)
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def _print_statement_sub(match):
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expr = match.groups('expr')
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return "print(%s)" % expr
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@_modify_str_or_docstring
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def doctest_refactor_print(doc):
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"""Refactor 'print x' statements in a doctest to print(x) style. 2to3
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unfortunately doesn't pick up on our doctests.
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Can accept a string or a function, so it can be used as a decorator."""
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return _print_statement_re.sub(_print_statement_sub, doc)
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# Abstract u'abc' syntax:
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@_modify_str_or_docstring
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def u_format(s):
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""""{u}'abc'" --> "'abc'" (Python 3)
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Accepts a string or a function, so it can be used as a decorator."""
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return s.format(u='')
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else:
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PY3 = False
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input = raw_input
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builtin_mod_name = "__builtin__"
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str_to_unicode = decode
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unicode_to_str = encode
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str_to_bytes = no_code
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bytes_to_str = no_code
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cast_bytes_py2 = cast_bytes
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import re
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_name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
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def isidentifier(s, dotted=False):
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if dotted:
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return all(isidentifier(a) for a in s.split("."))
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return bool(_name_re.match(s))
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class open(object):
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"""Wrapper providing key part of Python 3 open() interface."""
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def __init__(self, fname, mode="r", encoding="utf-8"):
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self.f = orig_open(fname, mode)
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self.enc = encoding
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def write(self, s):
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return self.f.write(s.encode(self.enc))
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def read(self, size=-1):
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return self.f.read(size).decode(self.enc)
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def close(self):
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return self.f.close()
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def __enter__(self):
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return self
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def __exit__(self, etype, value, traceback):
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self.f.close()
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def MethodType(func, instance):
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return types.MethodType(func, instance, type(instance))
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# don't override system execfile on 2.x:
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execfile = execfile
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def doctest_refactor_print(func_or_str):
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return func_or_str
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# Abstract u'abc' syntax:
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@_modify_str_or_docstring
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def u_format(s):
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""""{u}'abc'" --> "u'abc'" (Python 2)
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Accepts a string or a function, so it can be used as a decorator."""
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return s.format(u='u')
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if sys.platform == 'win32':
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def execfile(fname, glob=None, loc=None):
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loc = loc if (loc is not None) else glob
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# The rstrip() is necessary b/c trailing whitespace in files will
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# cause an IndentationError in Python 2.6 (this was fixed in 2.7,
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# but we still support 2.6). See issue 1027.
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scripttext = __builtin__.open(fname).read().rstrip() + '\n'
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# compile converts unicode filename to str assuming
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# ascii. Let's do the conversion before calling compile
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if isinstance(fname, unicode):
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filename = unicode_to_str(fname)
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else:
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filename = fname
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exec compile(scripttext, filename, 'exec') in glob, loc
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else:
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def execfile(fname, *where):
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if isinstance(fname, unicode):
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filename = fname.encode(sys.getfilesystemencoding())
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else:
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filename = fname
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__builtin__.execfile(filename, *where)
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