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104 lines
3.4 KiB
Python
104 lines
3.4 KiB
Python
import re
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import unicodedata
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import codecs
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import six
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def always_bytes(unicode_or_bytes, *encode_args):
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if isinstance(unicode_or_bytes, six.text_type):
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return unicode_or_bytes.encode(*encode_args)
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return unicode_or_bytes
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def native(s, *encoding_opts):
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"""
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Convert :py:class:`bytes` or :py:class:`unicode` to the native
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:py:class:`str` type, using latin1 encoding if conversion is necessary.
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https://www.python.org/dev/peps/pep-3333/#a-note-on-string-types
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"""
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if not isinstance(s, (six.binary_type, six.text_type)):
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raise TypeError("%r is neither bytes nor unicode" % s)
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if six.PY3:
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if isinstance(s, six.binary_type):
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return s.decode(*encoding_opts)
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else:
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if isinstance(s, six.text_type):
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return s.encode(*encoding_opts)
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return s
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def clean_bin(s, keep_spacing=True):
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"""
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Cleans binary data to make it safe to display.
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Args:
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keep_spacing: If False, tabs and newlines will also be replaced.
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"""
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if isinstance(s, six.text_type):
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if keep_spacing:
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keep = u" \n\r\t"
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else:
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keep = u" "
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return u"".join(
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ch if (unicodedata.category(ch)[0] not in "CZ" or ch in keep) else u"."
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for ch in s
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)
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else:
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if keep_spacing:
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keep = (9, 10, 13) # \t, \n, \r,
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else:
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keep = ()
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return b"".join(
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six.int2byte(ch) if (31 < ch < 127 or ch in keep) else b"."
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for ch in six.iterbytes(s)
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)
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def safe_subn(pattern, repl, target, *args, **kwargs):
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"""
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There are Unicode conversion problems with re.subn. We try to smooth
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that over by casting the pattern and replacement to strings. We really
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need a better solution that is aware of the actual content ecoding.
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"""
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return re.subn(str(pattern), str(repl), target, *args, **kwargs)
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def bytes_to_escaped_str(data):
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"""
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Take bytes and return a safe string that can be displayed to the user.
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Single quotes are always escaped, double quotes are never escaped:
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"'" + bytes_to_escaped_str(...) + "'"
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gives a valid Python string.
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"""
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# TODO: We may want to support multi-byte characters without escaping them.
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# One way to do would be calling .decode("utf8", "backslashreplace") first
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# and then escaping UTF8 control chars (see clean_bin).
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if not isinstance(data, bytes):
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raise ValueError("data must be bytes, but is {}".format(data.__class__.__name__))
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# We always insert a double-quote here so that we get a single-quoted string back
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# https://stackoverflow.com/questions/29019340/why-does-python-use-different-quotes-for-representing-strings-depending-on-their
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return repr(b'"' + data).lstrip("b")[2:-1]
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def escaped_str_to_bytes(data):
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"""
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Take an escaped string and return the unescaped bytes equivalent.
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"""
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if not isinstance(data, six.string_types):
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if six.PY2:
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raise ValueError("data must be str or unicode, but is {}".format(data.__class__.__name__))
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raise ValueError("data must be str, but is {}".format(data.__class__.__name__))
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if six.PY2:
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if isinstance(data, unicode):
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data = data.encode("utf8")
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return data.decode("string-escape")
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# This one is difficult - we use an undocumented Python API here
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# as per http://stackoverflow.com/a/23151714/934719
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return codecs.escape_decode(data)[0]
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