copy to_bytes and to_unicode functions from kitchen for use in v2
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Toshio Kuratomi
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243
v2/ansible/utils/unicode.py
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243
v2/ansible/utils/unicode.py
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# (c) 2012-2014, Toshio Kuraotmi <a.badger@gmail.com>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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# Make coding more python3-ish
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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# to_bytes and to_unicode were written by Toshio Kuratomi for the
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# python-kitchen library https://pypi.python.org/pypi/kitchen
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# They are licensed in kitchen under the terms of the GPLv2+
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# They were copied and modified for use in ansible by Toshio in Jan 2015
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# (simply removing the deprecated features)
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#: Aliases for the utf-8 codec
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_UTF8_ALIASES = frozenset(('utf-8', 'UTF-8', 'utf8', 'UTF8', 'utf_8', 'UTF_8',
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'utf', 'UTF', 'u8', 'U8'))
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#: Aliases for the latin-1 codec
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_LATIN1_ALIASES = frozenset(('latin-1', 'LATIN-1', 'latin1', 'LATIN1',
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'latin', 'LATIN', 'l1', 'L1', 'cp819', 'CP819', '8859', 'iso8859-1',
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'ISO8859-1', 'iso-8859-1', 'ISO-8859-1'))
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# EXCEPTION_CONVERTERS is defined below due to using to_unicode
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def to_unicode(obj, encoding='utf-8', errors='replace', nonstring=None):
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'''Convert an object into a :class:`unicode` string
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:arg obj: Object to convert to a :class:`unicode` string. This should
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normally be a byte :class:`str`
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:kwarg encoding: What encoding to try converting the byte :class:`str` as.
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Defaults to :term:`utf-8`
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:kwarg errors: If errors are found while decoding, perform this action.
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Defaults to ``replace`` which replaces the invalid bytes with
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a character that means the bytes were unable to be decoded. Other
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values are the same as the error handling schemes in the `codec base
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classes
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<http://docs.python.org/library/codecs.html#codec-base-classes>`_.
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For instance ``strict`` which raises an exception and ``ignore`` which
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simply omits the non-decodable characters.
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:kwarg nonstring: How to treat nonstring values. Possible values are:
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:simplerepr: Attempt to call the object's "simple representation"
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method and return that value. Python-2.3+ has two methods that
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try to return a simple representation: :meth:`object.__unicode__`
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and :meth:`object.__str__`. We first try to get a usable value
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from :meth:`object.__unicode__`. If that fails we try the same
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with :meth:`object.__str__`.
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:empty: Return an empty :class:`unicode` string
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:strict: Raise a :exc:`TypeError`
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:passthru: Return the object unchanged
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:repr: Attempt to return a :class:`unicode` string of the repr of the
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object
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Default is ``simplerepr``
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:raises TypeError: if :attr:`nonstring` is ``strict`` and
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a non-:class:`basestring` object is passed in or if :attr:`nonstring`
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is set to an unknown value
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:raises UnicodeDecodeError: if :attr:`errors` is ``strict`` and
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:attr:`obj` is not decodable using the given encoding
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:returns: :class:`unicode` string or the original object depending on the
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value of :attr:`nonstring`.
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Usually this should be used on a byte :class:`str` but it can take both
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byte :class:`str` and :class:`unicode` strings intelligently. Nonstring
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objects are handled in different ways depending on the setting of the
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:attr:`nonstring` parameter.
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The default values of this function are set so as to always return
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a :class:`unicode` string and never raise an error when converting from
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a byte :class:`str` to a :class:`unicode` string. However, when you do
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not pass validly encoded text (or a nonstring object), you may end up with
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output that you don't expect. Be sure you understand the requirements of
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your data, not just ignore errors by passing it through this function.
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'''
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# Could use isbasestring/isunicode here but we want this code to be as
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# fast as possible
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if isinstance(obj, basestring):
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if isinstance(obj, unicode):
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return obj
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if encoding in _UTF8_ALIASES:
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return unicode(obj, 'utf-8', errors)
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if encoding in _LATIN1_ALIASES:
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return unicode(obj, 'latin-1', errors)
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return obj.decode(encoding, errors)
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if not nonstring:
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nonstring = 'simplerepr'
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if nonstring == 'empty':
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return u''
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elif nonstring == 'passthru':
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return obj
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elif nonstring == 'simplerepr':
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try:
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simple = obj.__unicode__()
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except (AttributeError, UnicodeError):
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simple = None
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if not simple:
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try:
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simple = str(obj)
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except UnicodeError:
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try:
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simple = obj.__str__()
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except (UnicodeError, AttributeError):
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simple = u''
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if isbytestring(simple):
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return unicode(simple, encoding, errors)
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return simple
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elif nonstring in ('repr', 'strict'):
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obj_repr = repr(obj)
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if isbytestring(obj_repr):
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obj_repr = unicode(obj_repr, encoding, errors)
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if nonstring == 'repr':
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return obj_repr
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raise TypeError('to_unicode was given "%(obj)s" which is neither'
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' a byte string (str) or a unicode string' %
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{'obj': obj_repr.encode(encoding, 'replace')})
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raise TypeError('nonstring value, %(param)s, is not set to a valid'
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' action' % {'param': nonstring})
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def to_bytes(obj, encoding='utf-8', errors='replace', nonstring=None):
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'''Convert an object into a byte :class:`str`
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:arg obj: Object to convert to a byte :class:`str`. This should normally
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be a :class:`unicode` string.
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:kwarg encoding: Encoding to use to convert the :class:`unicode` string
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into a byte :class:`str`. Defaults to :term:`utf-8`.
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:kwarg errors: If errors are found while encoding, perform this action.
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Defaults to ``replace`` which replaces the invalid bytes with
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a character that means the bytes were unable to be encoded. Other
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values are the same as the error handling schemes in the `codec base
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classes
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<http://docs.python.org/library/codecs.html#codec-base-classes>`_.
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For instance ``strict`` which raises an exception and ``ignore`` which
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simply omits the non-encodable characters.
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:kwarg nonstring: How to treat nonstring values. Possible values are:
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:simplerepr: Attempt to call the object's "simple representation"
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method and return that value. Python-2.3+ has two methods that
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try to return a simple representation: :meth:`object.__unicode__`
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and :meth:`object.__str__`. We first try to get a usable value
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from :meth:`object.__str__`. If that fails we try the same
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with :meth:`object.__unicode__`.
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:empty: Return an empty byte :class:`str`
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:strict: Raise a :exc:`TypeError`
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:passthru: Return the object unchanged
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:repr: Attempt to return a byte :class:`str` of the :func:`repr` of the
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object
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Default is ``simplerepr``.
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:raises TypeError: if :attr:`nonstring` is ``strict`` and
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a non-:class:`basestring` object is passed in or if :attr:`nonstring`
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is set to an unknown value.
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:raises UnicodeEncodeError: if :attr:`errors` is ``strict`` and all of the
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bytes of :attr:`obj` are unable to be encoded using :attr:`encoding`.
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:returns: byte :class:`str` or the original object depending on the value
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of :attr:`nonstring`.
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.. warning::
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If you pass a byte :class:`str` into this function the byte
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:class:`str` is returned unmodified. It is **not** re-encoded with
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the specified :attr:`encoding`. The easiest way to achieve that is::
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to_bytes(to_unicode(text), encoding='utf-8')
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The initial :func:`to_unicode` call will ensure text is
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a :class:`unicode` string. Then, :func:`to_bytes` will turn that into
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a byte :class:`str` with the specified encoding.
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Usually, this should be used on a :class:`unicode` string but it can take
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either a byte :class:`str` or a :class:`unicode` string intelligently.
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Nonstring objects are handled in different ways depending on the setting
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of the :attr:`nonstring` parameter.
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The default values of this function are set so as to always return a byte
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:class:`str` and never raise an error when converting from unicode to
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bytes. However, when you do not pass an encoding that can validly encode
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the object (or a non-string object), you may end up with output that you
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don't expect. Be sure you understand the requirements of your data, not
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just ignore errors by passing it through this function.
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'''
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# Could use isbasestring, isbytestring here but we want this to be as fast
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# as possible
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if isinstance(obj, basestring):
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if isinstance(obj, str):
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return obj
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return obj.encode(encoding, errors)
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if not nonstring:
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nonstring = 'simplerepr'
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if nonstring == 'empty':
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return ''
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elif nonstring == 'passthru':
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return obj
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elif nonstring == 'simplerepr':
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try:
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simple = str(obj)
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except UnicodeError:
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try:
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simple = obj.__str__()
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except (AttributeError, UnicodeError):
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simple = None
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if not simple:
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try:
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simple = obj.__unicode__()
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except (AttributeError, UnicodeError):
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simple = ''
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if isunicodestring(simple):
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simple = simple.encode(encoding, 'replace')
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return simple
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elif nonstring in ('repr', 'strict'):
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try:
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obj_repr = obj.__repr__()
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except (AttributeError, UnicodeError):
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obj_repr = ''
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if isunicodestring(obj_repr):
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obj_repr = obj_repr.encode(encoding, errors)
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else:
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obj_repr = str(obj_repr)
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if nonstring == 'repr':
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return obj_repr
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raise TypeError('to_bytes was given "%(obj)s" which is neither'
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' a unicode string or a byte string (str)' % {'obj': obj_repr})
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raise TypeError('nonstring value, %(param)s, is not set to a valid'
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' action' % {'param': nonstring})
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