alternative_import() - Code Metrics - Inspection of "implement browse endpoint cache" - ergoithz/browsepy - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — 5.2-unstable ( ee49a9...946858 )

by Felipe A.

created 2016-12-07 14:50 UTC

alternative_import() B

↳ Parent: Project

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Lines	0
Ratio	0 %

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Metric	Value
cc	5
dl	0
loc	25
rs	8.0894
c	0
b	0
f	0

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import os
import os.path
import sys
import itertools

import warnings
import functools

FS_ENCODING = sys.getfilesystemencoding()
PY_LEGACY = sys.version_info < (3, )
TRUE_VALUES = frozenset(('true', 'yes', '1', 'enable', 'enabled', True, 1))

try:
    from scandir import scandir, walk
except ImportError:
    if not hasattr(os, 'scandir'):
        raise
    scandir = os.scandir
    walk = os.walk


def isexec(path):
    '''
    Check if given path points to an executable file.

    :param path: file path
    :type path: str
    :return: True if executable, False otherwise
    :rtype: bool
    '''
    return os.path.isfile(path) and os.access(path, os.X_OK)


def fsdecode(path, os_name=os.name, fs_encoding=FS_ENCODING, errors=None):
    '''
    Decode given path.

    :param path: path will be decoded if using bytes
    :type path: bytes or str
    :param os_name: operative system name, defaults to os.name
    :type os_name: str
    :param fs_encoding: current filesystem encoding, defaults to autodetected
    :type fs_encoding: str
    :return: decoded path
    :rtype: str
    '''
    if not isinstance(path, bytes):
        return path
    if not errors:
        use_strict = PY_LEGACY or os_name == 'nt'
        errors = 'strict' if use_strict else 'surrogateescape'
    return path.decode(fs_encoding, errors=errors)


def fsencode(path, os_name=os.name, fs_encoding=FS_ENCODING, errors=None):
    '''
    Encode given path.

    :param path: path will be encoded if not using bytes
    :type path: bytes or str
    :param os_name: operative system name, defaults to os.name
    :type os_name: str
    :param fs_encoding: current filesystem encoding, defaults to autodetected
    :type fs_encoding: str
    :return: encoded path
    :rtype: bytes
    '''
    if isinstance(path, bytes):
        return path
    if not errors:
        use_strict = PY_LEGACY or os_name == 'nt'
        errors = 'strict' if use_strict else 'surrogateescape'
    return path.encode(fs_encoding, errors=errors)


def getcwd(fs_encoding=FS_ENCODING, cwd_fnc=os.getcwd):
    '''
    Get current work directory's absolute path.
    Like os.getcwd but garanteed to return an unicode-str object.

    :param fs_encoding: filesystem encoding, defaults to autodetected
    :type fs_encoding: str
    :param cwd_fnc: callable used to get the path, defaults to os.getcwd
    :type cwd_fnc: Callable
    :return: path
    :rtype: str
    '''
    path = cwd_fnc()
    if isinstance(path, bytes):
        path = fsdecode(path, fs_encoding=fs_encoding)
    return os.path.abspath(path)


def getdebug(environ=os.environ, true_values=TRUE_VALUES):
    '''
    Get if app is expected to be ran in debug mode looking at environment
    variables.

    :param environ: environment dict-like object
    :type environ: collections.abc.Mapping
    :returns: True if debug contains a true-like string, False otherwise
    :rtype: bool
    '''
    return environ.get('DEBUG', '').lower() in true_values


def deprecated(func_or_text, environ=os.environ):
    '''
    Decorator used to mark functions as deprecated. It will result in a
    warning being emmitted hen the function is called.

    Usage:

    >>> @deprecated
    ... def fnc():
    ...     pass

    Usage (custom message):

    >>> @deprecated('This is deprecated')
    ... def fnc():
    ...     pass

    :param func_or_text: message or callable to decorate
    :type func_or_text: callable
    :param environ: optional environment mapping
    :type environ: collections.abc.Mapping
    :returns: nested decorator or new decorated function (depending on params)
    :rtype: callable
    '''
    def inner(func):
        message = (
            'Deprecated function {}.'.format(func.__name__)
            if callable(func_or_text) else
            func_or_text
            )

        @functools.wraps(func)
        def new_func(*args, **kwargs):
            with warnings.catch_warnings():
                if getdebug(environ):
                    warnings.simplefilter('always', DeprecationWarning)
                warnings.warn(message, category=DeprecationWarning,
                              stacklevel=3)
            return func(*args, **kwargs)
        return new_func
    return inner(func_or_text) if callable(func_or_text) else inner


def usedoc(other):
    '''
    Decorator which copies __doc__ of given object into decorated one.

    Usage:

    >>> def fnc1():
    ...     """docstring"""
    ...     pass
    >>> @usedoc(fnc1)
    ... def fnc2():
    ...     pass
    >>> fnc2.__doc__
    'docstring'collections.abc.D

    :param other: anything with a __doc__ attribute
    :type other: any
    :returns: decorator function
    :rtype: callable
    '''
    def inner(fnc):
        fnc.__doc__ = fnc.__doc__ or getattr(other, '__doc__')
        return fnc
    return inner


def alternative_import(names):
    '''
    Import given module name with any of given namespaces.

    :param name:
    :type name: str
    :param namespaces: iterable of namespaces as str or None for absolute
    :type namespaces: iterable
    :returns: module reference
    :rtype: module
    :raises: ImportError
    '''

    for name in names:
        if name in sys.modules:
            return sys.modules[name]

    for name in names:
        try:
            __import__(name)
            return sys.modules[name]
        except (ImportError, KeyError):
            pass

    raise ImportError('No module found, tried %r' % names)


ENV_PATH = tuple(
  fsdecode(path.strip('"').replace('<SCAPED-PATHSEP>', os.pathsep))
  for path in os
    .environ['PATH']  # noqa
    .replace('\\%s' % os.pathsep, '<SCAPED-PATHSEP>')
    .split(os.pathsep)
  )


def which(name,
          env_path=ENV_PATH,
          is_executable_fnc=isexec,
          path_join_fnc=os.path.join):
    '''
    Get command absolute path.

    :param name: name of executable command
    :type name: str
    :param env_path: OS environment executable paths, defaults to autodetected
    :type env_path: list of str
    :param is_executable_fnc: callable will be used to detect if path is
                              executable, defaults to `isexec`
    :type is_executable_fnc: Callable
    :param path_join_fnc: callable will be used to join path components
    :type path_join_fnc: Callable
    :return: absolute path
    :rtype: str or None
    '''
    for path in env_path:
        exe_file = path_join_fnc(path, name)
        if is_executable_fnc(exe_file):
            return exe_file
    return None


if PY_LEGACY:
    FileNotFoundError = type('FileNotFoundError', (OSError,), {})  # noqa
    range = xrange  # noqa
    filter = itertools.ifilter
    basestring = basestring  # noqa
    unicode = unicode  # noqa
else:
    FileNotFoundError = FileNotFoundError
    range = range
    filter = filter
    basestring = str
    unicode = str


1			#!/usr/bin/env python
2			# -- coding: UTF-8 --
3
4			import os
5			import os.path
6			import sys
7			import itertools
8
9			import warnings
10			import functools
11
12			FS_ENCODING = sys.getfilesystemencoding()
13			PY_LEGACY = sys.version_info < (3, )
14			TRUE_VALUES = frozenset(('true', 'yes', '1', 'enable', 'enabled', True, 1))
15
16			try:
17			from scandir import scandir, walk
18			except ImportError:
19			if not hasattr(os, 'scandir'):
20			raise
21			scandir = os.scandir
22			walk = os.walk
23
24
25			def isexec(path):
26			'''
27			Check if given path points to an executable file.
28
29			:param path: file path
30			:type path: str
31			:return: True if executable, False otherwise
32			:rtype: bool
33			'''
34			return os.path.isfile(path) and os.access(path, os.X_OK)
35
36
37			def fsdecode(path, os_name=os.name, fs_encoding=FS_ENCODING, errors=None):
38			'''
39			Decode given path.
40
41			:param path: path will be decoded if using bytes
42			:type path: bytes or str
43			:param os_name: operative system name, defaults to os.name
44			:type os_name: str
45			:param fs_encoding: current filesystem encoding, defaults to autodetected
46			:type fs_encoding: str
47			:return: decoded path
48			:rtype: str
49			'''
50			if not isinstance(path, bytes):
51			return path
52			if not errors:
53			use_strict = PY_LEGACY or os_name == 'nt'
54			errors = 'strict' if use_strict else 'surrogateescape'
55			return path.decode(fs_encoding, errors=errors)
56
57
58			def fsencode(path, os_name=os.name, fs_encoding=FS_ENCODING, errors=None):
59			'''
60			Encode given path.
61
62			:param path: path will be encoded if not using bytes
63			:type path: bytes or str
64			:param os_name: operative system name, defaults to os.name
65			:type os_name: str
66			:param fs_encoding: current filesystem encoding, defaults to autodetected
67			:type fs_encoding: str
68			:return: encoded path
69			:rtype: bytes
70			'''
71			if isinstance(path, bytes):
72			return path
73			if not errors:
74			use_strict = PY_LEGACY or os_name == 'nt'
75			errors = 'strict' if use_strict else 'surrogateescape'
76			return path.encode(fs_encoding, errors=errors)
77
78
79			def getcwd(fs_encoding=FS_ENCODING, cwd_fnc=os.getcwd):
80			'''
81			Get current work directory's absolute path.
82			Like os.getcwd but garanteed to return an unicode-str object.
83
84			:param fs_encoding: filesystem encoding, defaults to autodetected
85			:type fs_encoding: str
86			:param cwd_fnc: callable used to get the path, defaults to os.getcwd
87			:type cwd_fnc: Callable
88			:return: path
89			:rtype: str
90			'''
91			path = cwd_fnc()
92			if isinstance(path, bytes):
93			path = fsdecode(path, fs_encoding=fs_encoding)
94			return os.path.abspath(path)
95
96
97			def getdebug(environ=os.environ, true_values=TRUE_VALUES):
98			'''
99			Get if app is expected to be ran in debug mode looking at environment
100			variables.
101
102			:param environ: environment dict-like object
103			:type environ: collections.abc.Mapping
104			:returns: True if debug contains a true-like string, False otherwise
105			:rtype: bool
106			'''
107			return environ.get('DEBUG', '').lower() in true_values
108
109
110			def deprecated(func_or_text, environ=os.environ):
111			'''
112			Decorator used to mark functions as deprecated. It will result in a
113			warning being emmitted hen the function is called.
114
115			Usage:
116
117			>>> @deprecated
118			... def fnc():
119			... pass
120
121			Usage (custom message):
122
123			>>> @deprecated('This is deprecated')
124			... def fnc():
125			... pass
126
127			:param func_or_text: message or callable to decorate
128			:type func_or_text: callable
129			:param environ: optional environment mapping
130			:type environ: collections.abc.Mapping
131			:returns: nested decorator or new decorated function (depending on params)
132			:rtype: callable
133			'''
134			def inner(func):
135			message = (
136			'Deprecated function {}.'.format(func.__name__)
137			if callable(func_or_text) else
138			func_or_text
139			)
140
141			@functools.wraps(func)
142			def new_func(args, *kwargs):
143			with warnings.catch_warnings():
144			if getdebug(environ):
145			warnings.simplefilter('always', DeprecationWarning)
146			warnings.warn(message, category=DeprecationWarning,
147			stacklevel=3)
148			return func(args, *kwargs)
149			return new_func
150			return inner(func_or_text) if callable(func_or_text) else inner
151
152
153			def usedoc(other):
154			'''
155			Decorator which copies __doc__ of given object into decorated one.
156
157			Usage:
158
159			>>> def fnc1():
160			... """docstring"""
161			... pass
162			>>> @usedoc(fnc1)
163			... def fnc2():
164			... pass
165			>>> fnc2.__doc__
166			'docstring'collections.abc.D
167
168			:param other: anything with a __doc__ attribute
169			:type other: any
170			:returns: decorator function
171			:rtype: callable
172			'''
173			def inner(fnc):
174			fnc.__doc__ = fnc.__doc__ or getattr(other, '__doc__')
175			return fnc
176			return inner
177
178
179			def alternative_import(names):
180			'''
181			Import given module name with any of given namespaces.
182
183			:param name:
184			:type name: str
185			:param namespaces: iterable of namespaces as str or None for absolute
186			:type namespaces: iterable
187			:returns: module reference
188			:rtype: module
189			:raises: ImportError
190			'''
191
192			for name in names:
193			if name in sys.modules:
194			return sys.modules[name]
195
196			for name in names:
197			try:
198			__import__(name)
199			return sys.modules[name]
200			except (ImportError, KeyError):
201			pass
202
203			raise ImportError('No module found, tried %r' % names)
204
205
206			ENV_PATH = tuple(
207			fsdecode(path.strip('"').replace('<SCAPED-PATHSEP>', os.pathsep))
208			for path in os
209			.environ['PATH'] # noqa
210			.replace('\\%s' % os.pathsep, '<SCAPED-PATHSEP>')
211			.split(os.pathsep)
212			)
213
214
215			def which(name,
216			env_path=ENV_PATH,
217			is_executable_fnc=isexec,
218			path_join_fnc=os.path.join):
219			'''
220			Get command absolute path.
221
222			:param name: name of executable command
223			:type name: str
224			:param env_path: OS environment executable paths, defaults to autodetected
225			:type env_path: list of str
226			:param is_executable_fnc: callable will be used to detect if path is
227			executable, defaults to `isexec`
228			:type is_executable_fnc: Callable
229			:param path_join_fnc: callable will be used to join path components
230			:type path_join_fnc: Callable
231			:return: absolute path
232			:rtype: str or None
233			'''
234			for path in env_path:
235			exe_file = path_join_fnc(path, name)
236			if is_executable_fnc(exe_file):
237			return exe_file
238			return None
239
240
241			if PY_LEGACY:
242			FileNotFoundError = type('FileNotFoundError', (OSError,), {}) # noqa
243			range = xrange # noqa
244			filter = itertools.ifilter
245			basestring = basestring # noqa
246			unicode = unicode # noqa
247			else:
248			FileNotFoundError = FileNotFoundError
249			range = range
250			filter = filter
251			basestring = str
252			unicode = str
253

ergoithz / browsepy

Push — 5.2-unstable ( ee49a9...946858 )

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