253 lines
9.1 KiB
Python
253 lines
9.1 KiB
Python
from __future__ import unicode_literals
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import codecs
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import datetime
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from decimal import Decimal
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import locale
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try:
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from urllib.parse import quote
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except ImportError: # Python 2
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from urllib import quote
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import warnings
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from django.utils.functional import Promise
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from django.utils import six
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class DjangoUnicodeDecodeError(UnicodeDecodeError):
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def __init__(self, obj, *args):
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self.obj = obj
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UnicodeDecodeError.__init__(self, *args)
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def __str__(self):
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original = UnicodeDecodeError.__str__(self)
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return '%s. You passed in %r (%s)' % (original, self.obj,
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type(self.obj))
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class StrAndUnicode(object):
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"""
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A class that derives __str__ from __unicode__.
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On Python 2, __str__ returns the output of __unicode__ encoded as a UTF-8
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bytestring. On Python 3, __str__ returns the output of __unicode__.
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Useful as a mix-in. If you support Python 2 and 3 with a single code base,
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you can inherit this mix-in and just define __unicode__.
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"""
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def __init__(self, *args, **kwargs):
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warnings.warn("StrAndUnicode is deprecated. Define a __str__ method "
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"and apply the @python_2_unicode_compatible decorator "
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"instead.", DeprecationWarning, stacklevel=2)
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super(StrAndUnicode, self).__init__(*args, **kwargs)
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if six.PY3:
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def __str__(self):
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return self.__unicode__()
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else:
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def __str__(self):
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return self.__unicode__().encode('utf-8')
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def python_2_unicode_compatible(klass):
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"""
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A decorator that defines __unicode__ and __str__ methods under Python 2.
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Under Python 3 it does nothing.
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To support Python 2 and 3 with a single code base, define a __str__ method
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returning text and apply this decorator to the class.
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"""
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if not six.PY3:
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klass.__unicode__ = klass.__str__
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klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
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return klass
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def smart_text(s, encoding='utf-8', strings_only=False, errors='strict'):
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"""
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Returns a text object representing 's' -- unicode on Python 2 and str on
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Python 3. Treats bytestrings using the 'encoding' codec.
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If strings_only is True, don't convert (some) non-string-like objects.
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"""
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if isinstance(s, Promise):
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# The input is the result of a gettext_lazy() call.
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return s
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return force_text(s, encoding, strings_only, errors)
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def is_protected_type(obj):
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"""Determine if the object instance is of a protected type.
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Objects of protected types are preserved as-is when passed to
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force_text(strings_only=True).
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"""
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return isinstance(obj, six.integer_types + (type(None), float, Decimal,
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datetime.datetime, datetime.date, datetime.time))
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def force_text(s, encoding='utf-8', strings_only=False, errors='strict'):
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"""
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Similar to smart_text, except that lazy instances are resolved to
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strings, rather than kept as lazy objects.
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If strings_only is True, don't convert (some) non-string-like objects.
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"""
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# Handle the common case first, saves 30-40% when s is an instance of
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# six.text_type. This function gets called often in that setting.
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if isinstance(s, six.text_type):
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return s
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if strings_only and is_protected_type(s):
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return s
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try:
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if not isinstance(s, six.string_types):
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if hasattr(s, '__unicode__'):
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s = s.__unicode__()
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else:
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if six.PY3:
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if isinstance(s, bytes):
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s = six.text_type(s, encoding, errors)
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else:
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s = six.text_type(s)
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else:
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s = six.text_type(bytes(s), encoding, errors)
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else:
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# Note: We use .decode() here, instead of six.text_type(s, encoding,
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# errors), so that if s is a SafeBytes, it ends up being a
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# SafeText at the end.
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s = s.decode(encoding, errors)
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except UnicodeDecodeError as e:
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if not isinstance(s, Exception):
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raise DjangoUnicodeDecodeError(s, *e.args)
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else:
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# If we get to here, the caller has passed in an Exception
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# subclass populated with non-ASCII bytestring data without a
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# working unicode method. Try to handle this without raising a
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# further exception by individually forcing the exception args
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# to unicode.
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s = ' '.join([force_text(arg, encoding, strings_only,
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errors) for arg in s])
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return s
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def smart_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
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"""
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Returns a bytestring version of 's', encoded as specified in 'encoding'.
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If strings_only is True, don't convert (some) non-string-like objects.
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"""
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if isinstance(s, Promise):
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# The input is the result of a gettext_lazy() call.
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return s
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return force_bytes(s, encoding, strings_only, errors)
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def force_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
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"""
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Similar to smart_bytes, except that lazy instances are resolved to
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strings, rather than kept as lazy objects.
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If strings_only is True, don't convert (some) non-string-like objects.
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"""
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if isinstance(s, six.memoryview):
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s = bytes(s)
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if isinstance(s, bytes):
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if encoding == 'utf-8':
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return s
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else:
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return s.decode('utf-8', errors).encode(encoding, errors)
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if strings_only and (s is None or isinstance(s, int)):
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return s
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if isinstance(s, Promise):
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return six.text_type(s).encode(encoding, errors)
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if not isinstance(s, six.string_types):
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try:
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if six.PY3:
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return six.text_type(s).encode(encoding)
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else:
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return bytes(s)
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except UnicodeEncodeError:
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if isinstance(s, Exception):
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# An Exception subclass containing non-ASCII data that doesn't
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# know how to print itself properly. We shouldn't raise a
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# further exception.
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return b' '.join([force_bytes(arg, encoding, strings_only,
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errors) for arg in s])
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return six.text_type(s).encode(encoding, errors)
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else:
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return s.encode(encoding, errors)
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if six.PY3:
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smart_str = smart_text
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force_str = force_text
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else:
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smart_str = smart_bytes
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force_str = force_bytes
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# backwards compatibility for Python 2
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smart_unicode = smart_text
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force_unicode = force_text
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smart_str.__doc__ = """\
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Apply smart_text in Python 3 and smart_bytes in Python 2.
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This is suitable for writing to sys.stdout (for instance).
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"""
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force_str.__doc__ = """\
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Apply force_text in Python 3 and force_bytes in Python 2.
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"""
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def iri_to_uri(iri):
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"""
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Convert an Internationalized Resource Identifier (IRI) portion to a URI
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portion that is suitable for inclusion in a URL.
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This is the algorithm from section 3.1 of RFC 3987. However, since we are
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assuming input is either UTF-8 or unicode already, we can simplify things a
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little from the full method.
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Returns an ASCII string containing the encoded result.
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"""
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# The list of safe characters here is constructed from the "reserved" and
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# "unreserved" characters specified in sections 2.2 and 2.3 of RFC 3986:
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# reserved = gen-delims / sub-delims
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# gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
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# sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
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# / "*" / "+" / "," / ";" / "="
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# unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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# Of the unreserved characters, urllib.quote already considers all but
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# the ~ safe.
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# The % character is also added to the list of safe characters here, as the
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# end of section 3.1 of RFC 3987 specifically mentions that % must not be
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# converted.
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if iri is None:
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return iri
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return quote(force_bytes(iri), safe=b"/#%[]=:;$&()+,!?*@'~")
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def filepath_to_uri(path):
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"""Convert a file system path to a URI portion that is suitable for
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inclusion in a URL.
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We are assuming input is either UTF-8 or unicode already.
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This method will encode certain chars that would normally be recognized as
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special chars for URIs. Note that this method does not encode the '
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character, as it is a valid character within URIs. See
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encodeURIComponent() JavaScript function for more details.
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Returns an ASCII string containing the encoded result.
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"""
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if path is None:
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return path
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# I know about `os.sep` and `os.altsep` but I want to leave
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# some flexibility for hardcoding separators.
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return quote(force_bytes(path).replace(b"\\", b"/"), safe=b"/~!*()'")
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def get_system_encoding():
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"""
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The encoding of the default system locale but falls back to the given
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fallback encoding if the encoding is unsupported by python or could
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not be determined. See tickets #10335 and #5846
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"""
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try:
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encoding = locale.getdefaultlocale()[1] or 'ascii'
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codecs.lookup(encoding)
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except Exception:
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encoding = 'ascii'
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return encoding
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DEFAULT_LOCALE_ENCODING = get_system_encoding()
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