forked from Rust-related/RustPython
136 lines
3.8 KiB
Python
136 lines
3.8 KiB
Python
import sys
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from _os import *
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if name == 'nt':
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linesep = '\r\n'
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import ntpath as path
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else:
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linesep = '\n'
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import posixpath as path
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sys.modules['os.path'] = path
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from os.path import (curdir, pardir, sep, pathsep, defpath, extsep, altsep,
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devnull)
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# Change environ to automatically call putenv(), unsetenv if they exist.
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from _collections_abc import MutableMapping
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class _Environ(MutableMapping):
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def __init__(self, data, encodekey, decodekey, encodevalue, decodevalue, putenv, unsetenv):
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self.encodekey = encodekey
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self.decodekey = decodekey
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self.encodevalue = encodevalue
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self.decodevalue = decodevalue
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self.putenv = putenv
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self.unsetenv = unsetenv
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self._data = data
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def __getitem__(self, key):
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try:
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value = self._data[self.encodekey(key)]
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except KeyError:
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# raise KeyError with the original key value
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raise KeyError(key) from None
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return self.decodevalue(value)
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def __setitem__(self, key, value):
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key = self.encodekey(key)
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value = self.encodevalue(value)
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self.putenv(key, value)
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self._data[key] = value
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def __delitem__(self, key):
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encodedkey = self.encodekey(key)
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self.unsetenv(encodedkey)
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try:
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del self._data[encodedkey]
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except KeyError:
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# raise KeyError with the original key value
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raise KeyError(key) from None
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def __iter__(self):
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# list() from dict object is an atomic operation
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keys = list(self._data)
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for key in keys:
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yield self.decodekey(key)
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def __len__(self):
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return len(self._data)
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def __repr__(self):
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return 'environ({{{}}})'.format(', '.join(
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('{!r}: {!r}'.format(self.decodekey(key), self.decodevalue(value))
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for key, value in self._data.items())))
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def copy(self):
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return dict(self)
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def setdefault(self, key, value):
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if key not in self:
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self[key] = value
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return self[key]
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try:
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_putenv = putenv
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except NameError:
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_putenv = lambda key, value: None
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# else:
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# if "putenv" not in __all__:
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# __all__.append("putenv")
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try:
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_unsetenv = unsetenv
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except NameError:
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_unsetenv = lambda key: _putenv(key, "")
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# else:
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# if "unsetenv" not in __all__:
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# __all__.append("unsetenv")
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def _createenviron():
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# if name == 'nt':
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# # Where Env Var Names Must Be UPPERCASE
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# def check_str(value):
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# if not isinstance(value, str):
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# raise TypeError("str expected, not %s" % type(value).__name__)
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# return value
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# encode = check_str
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# decode = str
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# def encodekey(key):
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# return encode(key).upper()
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# data = {}
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# for key, value in environ.items():
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# data[encodekey(key)] = value
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# else:
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# # Where Env Var Names Can Be Mixed Case
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# encoding = sys.getfilesystemencoding()
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# def encode(value):
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# if not isinstance(value, str):
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# raise TypeError("str expected, not %s" % type(value).__name__)
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# return value.encode(encoding, 'surrogateescape')
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# def decode(value):
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# return value.decode(encoding, 'surrogateescape')
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# encodekey = encode
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decode = str
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encode = str
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encodekey = encode
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data = environ
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return _Environ(data,
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encodekey, decode,
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encode, decode,
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_putenv, _unsetenv)
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# unicode environ
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environ = _createenviron()
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del _createenviron
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def getenv(key, default=None):
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"""Get an environment variable, return None if it doesn't exist.
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The optional second argument can specify an alternate default.
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key, default and the result are str."""
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return environ.get(key, default)
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