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130 lines
4.0 KiB
130 lines
4.0 KiB
# Copyright 2015 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Utilities for Python2 / Python3 compatibility."""
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import codecs
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import io
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import os
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import sys
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PY3 = sys.version_info[0] >= 3
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PY36 = sys.version_info[0] >= 3 and sys.version_info[1] >= 6
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if PY3:
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StringIO = io.StringIO
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BytesIO = io.BytesIO
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import codecs
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def open_with_encoding(filename, mode, encoding, newline=''): # pylint: disable=unused-argument
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return codecs.open(filename, mode=mode, encoding=encoding)
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import functools
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lru_cache = functools.lru_cache
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range = range
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ifilter = filter
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def raw_input():
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wrapper = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
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return wrapper.buffer.raw.readall().decode('utf-8')
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import configparser
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# Mappings from strings to booleans (such as '1' to True, 'false' to False,
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# etc.)
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CONFIGPARSER_BOOLEAN_STATES = configparser.ConfigParser.BOOLEAN_STATES
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else:
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import __builtin__
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import cStringIO
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StringIO = BytesIO = cStringIO.StringIO
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open_with_encoding = io.open
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# Python 2.7 doesn't have a native LRU cache, so do nothing.
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def lru_cache(maxsize=128, typed=False):
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def fake_wrapper(user_function):
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return user_function
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return fake_wrapper
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range = xrange
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from itertools import ifilter
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raw_input = raw_input
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import ConfigParser as configparser
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CONFIGPARSER_BOOLEAN_STATES = configparser.ConfigParser._boolean_states # pylint: disable=protected-access
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def EncodeAndWriteToStdout(s, encoding='utf-8'):
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"""Encode the given string and emit to stdout.
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The string may contain non-ascii characters. This is a problem when stdout is
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redirected, because then Python doesn't know the encoding and we may get a
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UnicodeEncodeError.
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Arguments:
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s: (string) The string to encode.
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encoding: (string) The encoding of the string.
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"""
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if PY3:
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sys.stdout.buffer.write(s.encode(encoding))
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elif sys.platform == 'win32':
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# On python 2 and Windows universal newline transformation will be in
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# effect on stdout. Python 2 will not let us avoid the easily because
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# it happens based on whether the file handle is opened in O_BINARY or
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# O_TEXT state. However we can tell Windows itself to change the current
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# mode, and python 2 will follow suit. However we must take care to change
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# the mode on the actual external stdout not just the current sys.stdout
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# which may have been monkey-patched inside the python environment.
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import msvcrt # pylint: disable=g-import-not-at-top
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if sys.__stdout__ is sys.stdout:
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msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
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sys.stdout.write(s.encode(encoding))
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else:
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sys.stdout.write(s.encode(encoding))
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if PY3:
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basestring = str
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unicode = str # pylint: disable=redefined-builtin,invalid-name
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else:
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basestring = basestring
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def unicode(s): # pylint: disable=invalid-name
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"""Force conversion of s to unicode."""
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return __builtin__.unicode(s, 'utf-8')
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# In Python 3.2+, readfp is deprecated in favor of read_file, which doesn't
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# exist in Python 2 yet. To avoid deprecation warnings, subclass ConfigParser to
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# fix this - now read_file works across all Python versions we care about.
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class ConfigParser(configparser.ConfigParser):
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if not PY3:
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def read_file(self, fp, source=None):
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self.readfp(fp, filename=source)
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def removeBOM(source):
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"""Remove any Byte-order-Mark bytes from the beginning of a file."""
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bom = codecs.BOM_UTF8
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if PY3:
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bom = bom.decode('utf-8')
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if source.startswith(bom):
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return source[len(bom):]
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return source
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