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# encoding=UTF-8
# Copyright © 2008, 2009, 2010, 2011, 2012 Jakub Wilk <jwilk@jwilk.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 dated June, 1991.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
import functools
import locale
import os
import re
import warnings
debian = os.path.exists('/etc/debian_version')
def enhance_import_error(exception, package, debian_package, homepage):
message = str(exception)
format = '%(message)s; please install the %(package)s package'
if debian:
package = debian_package
else:
format += ' <%(homepage)s>'
exception.args = [format % locals()]
def parse_page_numbers(pages):
'''
parse_page_numbers(None) -> None
parse_page_numbers('17') -> [17]
parse_page_numbers('37-42') -> [37, 38, ..., 42]
parse_page_numbers('17,37-42') -> [17, 37, 38, ..., 42]
parse_page_numbers('42-37') -> []
parse_page_numbers('17-17') -> [17]
'''
if pages is None:
return
result = []
for page_range in pages.split(','):
if '-' in page_range:
x, y = map(int, page_range.split('-', 1))
result += xrange(x, y + 1)
else:
result += int(page_range, 10),
return result
_special_chars_replace = re.compile(ur'''[\x00-\x1f'"\x5c\x7f-\x9f]''', re.UNICODE).sub
def _special_chars_escape(m):
ch = m.group(0)
if ch in ('"', "'"):
return '\\' + ch
else:
return repr(ch)[2:-1]
def smart_repr(s, encoding=None):
if encoding is None:
return repr(s)
try:
u = s.decode(encoding)
except UnicodeDecodeError:
return repr(s)
return "'%s'" % _special_chars_replace(_special_chars_escape, u)
class EncodingWarning(UserWarning):
pass
_control_characters_regex = re.compile('[%s]' % ''.join(
ch for ch in map(chr, xrange(32))
if ch not in u'\n\r\t'
))
def sanitize_utf8(text):
'''
Replace invalid UTF-8 sequences and control characters (except CR, LF, TAB
and space) with Unicode replacement characters.
'''
try:
text = text.decode('UTF-8')
except UnicodeDecodeError, exc:
text = text.decode('UTF-8', 'replace')
message = str(exc)
message = re.sub("^'utf8' codec can't decode ", '', message)
warnings.warn(
message,
category=EncodingWarning,
stacklevel=2,
)
text = text.encode('UTF-8')
match = _control_characters_regex.search(text)
if match:
byte = ord(match.group())
message = 'byte 0x%02x in position %d: control character' % (byte, match.start())
warnings.warn(
message,
category=EncodingWarning,
stacklevel=2,
)
text = _control_characters_regex.sub(u'\N{REPLACEMENT CHARACTER}'.encode('UTF-8'), text)
# There are other code points that are not allowed in XML (or even: not
# allowed in UTF-8), but which Python happily accept. However, they haven't
# seemed to occur in real-world documents.
# http://www.w3.org/TR/2008/REC-xml-20081126/#NT-Char
return text
class NotOverriddenWarning(UserWarning):
pass
def not_overridden(f):
'''
Issue NotOverriddenWarning if the decorated method was not overridden in a
subclass, or called directly.
'''
@functools.wraps(f)
def new_f(self, *args, **kwargs):
cls = type(self)
warnings.warn(
'%s.%s.%s() is not overridden' % (cls.__module__, cls.__name__, f.__name__),
category=NotOverriddenWarning,
stacklevel=2
)
return f(self, *args, **kwargs)
return new_f
def str_as_unicode(s, encoding=locale.getpreferredencoding()):
if isinstance(s, unicode):
return s
return s.decode(encoding, 'replace')
def identity(x):
'''
identity(x) -> x
'''
return x
class property(object):
def __init__(self, default_value=None, filter=identity):
self._private_name = '__%s__%d' % (self.__module__, id(self))
self._filter = filter
self._default_value = default_value
def __get__(self, instance, cls):
if instance is None:
return self
return getattr(instance, self._private_name, self._default_value)
def __set__(self, instance, value):
setattr(instance, self._private_name, self._filter(value))
return
# vim:ts=4 sw=4 et
|
