##// END OF EJS Templates
ensure a fallback exists, so use local std{in,out,err}...
ensure a fallback exists, so use local std{in,out,err} Since IOStream instances require a valid fallback stream, use the locally defined std{in,out,err} instead of sys.std{in,out,err} in IOTerm's __init__ method. Note that the local std{in,out,err} are IOStream instances as well, that fall back to os.devnull

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py3compat.py
183 lines | 5.4 KiB | text/x-python | PythonLexer
# coding: utf-8
"""Compatibility tricks for Python 3. Mainly to do with unicode."""
import __builtin__
import functools
import sys
import re
import types
orig_open = open
def no_code(x, encoding=None):
return x
# to deal with the possibility of sys.std* not being a stream at all
def get_stream_enc(stream, default=None):
if not hasattr(stream, 'encoding') or not stream.encoding:
return default
else:
return stream.encoding
def decode(s, encoding=None):
encoding = get_stream_enc(sys.stdin, encoding) or sys.getdefaultencoding()
return s.decode(encoding, "replace")
def encode(u, encoding=None):
encoding = get_stream_enc(sys.stdin, encoding) or sys.getdefaultencoding()
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 _modify_str_or_docstring(str_change_func):
@functools.wraps(str_change_func)
def wrapper(func_or_str):
if isinstance(func_or_str, basestring):
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
if sys.version_info[0] >= 3:
PY3 = True
input = input
builtin_mod_name = "builtins"
str_to_unicode = no_code
unicode_to_str = no_code
str_to_bytes = encode
bytes_to_str = decode
cast_bytes_py2 = no_code
def isidentifier(s, dotted=False):
if dotted:
return all(isidentifier(a) for a in s.split("."))
return s.isidentifier()
open = orig_open
MethodType = types.MethodType
def execfile(fname, glob, loc=None):
loc = loc if (loc is not None) else glob
exec compile(open(fname, 'rb').read(), fname, 'exec') in glob, loc
# Refactor print statements in doctests.
_print_statement_re = re.compile(r"\bprint (?P<expr>.*)$", re.MULTILINE)
def _print_statement_sub(match):
expr = match.groups('expr')
return "print(%s)" % expr
@_modify_str_or_docstring
def doctest_refactor_print(doc):
"""Refactor 'print x' statements in a doctest to print(x) style. 2to3
unfortunately doesn't pick up on our doctests.
Can accept a string or a function, so it can be used as a decorator."""
return _print_statement_re.sub(_print_statement_sub, doc)
# Abstract u'abc' syntax:
@_modify_str_or_docstring
def u_format(s):
""""{u}'abc'" --> "'abc'" (Python 3)
Accepts a string or a function, so it can be used as a decorator."""
return s.format(u='')
else:
PY3 = False
input = raw_input
builtin_mod_name = "__builtin__"
str_to_unicode = decode
unicode_to_str = encode
str_to_bytes = no_code
bytes_to_str = no_code
cast_bytes_py2 = cast_bytes
import re
_name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$")
def isidentifier(s, dotted=False):
if dotted:
return all(isidentifier(a) for a in s.split("."))
return bool(_name_re.match(s))
class open(object):
"""Wrapper providing key part of Python 3 open() interface."""
def __init__(self, fname, mode="r", encoding="utf-8"):
self.f = orig_open(fname, mode)
self.enc = encoding
def write(self, s):
return self.f.write(s.encode(self.enc))
def read(self, size=-1):
return self.f.read(size).decode(self.enc)
def close(self):
return self.f.close()
def __enter__(self):
return self
def __exit__(self, etype, value, traceback):
self.f.close()
def MethodType(func, instance):
return types.MethodType(func, instance, type(instance))
# don't override system execfile on 2.x:
execfile = execfile
def doctest_refactor_print(func_or_str):
return func_or_str
# 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):
loc = loc if (loc is not None) else glob
# The rstrip() is necessary b/c trailing whitespace in files will
# cause an IndentationError in Python 2.6 (this was fixed in 2.7,
# but we still support 2.6). See issue 1027.
scripttext = __builtin__.open(fname).read().rstrip() + '\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
exec compile(scripttext, filename, 'exec') in glob, loc
else:
def execfile(fname, *where):
if isinstance(fname, unicode):
filename = fname.encode(sys.getfilesystemencoding())
else:
filename = fname
__builtin__.execfile(filename, *where)