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Edit File : text_encoding.py \| Size : 4.51 KB
# Protocol Buffers - Google's data interchange format # Copyright 2008 Google Inc. All rights reserved. # https://developers.google.com/protocol-buffers/ # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are # met: # # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above # copyright notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # * Neither the name of Google Inc. nor the names of its # contributors may be used to endorse or promote products derived from # this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. """Encoding related utilities.""" import re import six # Lookup table for utf8 _cescape_utf8_to_str = [chr(i) for i in range(0, 256)] _cescape_utf8_to_str[9] = r'\t' # optional escape _cescape_utf8_to_str[10] = r'\n' # optional escape _cescape_utf8_to_str[13] = r'\r' # optional escape _cescape_utf8_to_str[39] = r"\'" # optional escape _cescape_utf8_to_str[34] = r'\"' # necessary escape _cescape_utf8_to_str[92] = r'\\' # necessary escape # Lookup table for non-utf8, with necessary escapes at (o >= 127 or o < 32) _cescape_byte_to_str = ([r'\%03o' % i for i in range(0, 32)] + [chr(i) for i in range(32, 127)] + [r'\%03o' % i for i in range(127, 256)]) _cescape_byte_to_str[9] = r'\t' # optional escape _cescape_byte_to_str[10] = r'\n' # optional escape _cescape_byte_to_str[13] = r'\r' # optional escape _cescape_byte_to_str[39] = r"\'" # optional escape _cescape_byte_to_str[34] = r'\"' # necessary escape _cescape_byte_to_str[92] = r'\\' # necessary escape def CEscape(text, as_utf8): """Escape a bytes string for use in an ascii protocol buffer. text.encode('string_escape') does not seem to satisfy our needs as it encodes unprintable characters using two-digit hex escapes whereas our C++ unescaping function allows hex escapes to be any length. So, "\0011".encode('string_escape') ends up being "\\x011", which will be decoded in C++ as a single-character string with char code 0x11. Args: text: A byte string to be escaped as_utf8: Specifies if result should be returned in UTF-8 encoding Returns: Escaped string """ # PY3 hack: make Ord work for str and bytes: # //platforms/networking/data uses unicode here, hence basestring. Ord = ord if isinstance(text, six.string_types) else lambda x: x if as_utf8: return ''.join(_cescape_utf8_to_str[Ord(c)] for c in text) return ''.join(_cescape_byte_to_str[Ord(c)] for c in text) _CUNESCAPE_HEX = re.compile(r'(\\+)x([0-9a-fA-F])(?![0-9a-fA-F])') _cescape_highbit_to_str = ([chr(i) for i in range(0, 127)] + [r'\%03o' % i for i in range(127, 256)]) def CUnescape(text): """Unescape a text string with C-style escape sequences to UTF-8 bytes.""" def ReplaceHex(m): # Only replace the match if the number of leading back slashes is odd. i.e. # the slash itself is not escaped. if len(m.group(1)) & 1: return m.group(1) + 'x0' + m.group(2) return m.group(0) # This is required because the 'string_escape' encoding doesn't # allow single-digit hex escapes (like '\xf'). result = _CUNESCAPE_HEX.sub(ReplaceHex, text) if str is bytes: # PY2 return result.decode('string_escape') result = ''.join(_cescape_highbit_to_str[ord(c)] for c in result) return (result.encode('ascii') # Make it bytes to allow decode. .decode('unicode_escape') # Make it bytes again to return the proper type. .encode('raw_unicode_escape')) Back

Edit File : text_encoding.py | Size : 4.51 KB

# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# https://developers.google.com/protocol-buffers/
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Encoding related utilities."""
import re

import six

# Lookup table for utf8
_cescape_utf8_to_str = [chr(i) for i in range(0, 256)]
_cescape_utf8_to_str[9] = r'\t'  # optional escape
_cescape_utf8_to_str[10] = r'\n'  # optional escape
_cescape_utf8_to_str[13] = r'\r'  # optional escape
_cescape_utf8_to_str[39] = r"\'"  # optional escape

_cescape_utf8_to_str[34] = r'\"'  # necessary escape
_cescape_utf8_to_str[92] = r'\\'  # necessary escape

# Lookup table for non-utf8, with necessary escapes at (o >= 127 or o < 32)
_cescape_byte_to_str = ([r'\%03o' % i for i in range(0, 32)] +
                        [chr(i) for i in range(32, 127)] +
                        [r'\%03o' % i for i in range(127, 256)])
_cescape_byte_to_str[9] = r'\t'  # optional escape
_cescape_byte_to_str[10] = r'\n'  # optional escape
_cescape_byte_to_str[13] = r'\r'  # optional escape
_cescape_byte_to_str[39] = r"\'"  # optional escape

_cescape_byte_to_str[34] = r'\"'  # necessary escape
_cescape_byte_to_str[92] = r'\\'  # necessary escape

def CEscape(text, as_utf8):
  """Escape a bytes string for use in an ascii protocol buffer.

text.encode('string_escape') does not seem to satisfy our needs as it
  encodes unprintable characters using two-digit hex escapes whereas our
  C++ unescaping function allows hex escapes to be any length.  So,
  "\0011".encode('string_escape') ends up being "\\x011", which will be
  decoded in C++ as a single-character string with char code 0x11.

Args:
    text: A byte string to be escaped
    as_utf8: Specifies if result should be returned in UTF-8 encoding
  Returns:
    Escaped string
  """
  # PY3 hack: make Ord work for str and bytes:
  # //platforms/networking/data uses unicode here, hence basestring.
  Ord = ord if isinstance(text, six.string_types) else lambda x: x
  if as_utf8:
    return ''.join(_cescape_utf8_to_str[Ord(c)] for c in text)
  return ''.join(_cescape_byte_to_str[Ord(c)] for c in text)

_CUNESCAPE_HEX = re.compile(r'(\\+)x([0-9a-fA-F])(?![0-9a-fA-F])')
_cescape_highbit_to_str = ([chr(i) for i in range(0, 127)] +
                           [r'\%03o' % i for i in range(127, 256)])

def CUnescape(text):
  """Unescape a text string with C-style escape sequences to UTF-8 bytes."""

def ReplaceHex(m):
    # Only replace the match if the number of leading back slashes is odd. i.e.
    # the slash itself is not escaped.
    if len(m.group(1)) & 1:
      return m.group(1) + 'x0' + m.group(2)
    return m.group(0)

# This is required because the 'string_escape' encoding doesn't
  # allow single-digit hex escapes (like '\xf').
  result = _CUNESCAPE_HEX.sub(ReplaceHex, text)

if str is bytes:  # PY2
    return result.decode('string_escape')
  result = ''.join(_cescape_highbit_to_str[ord(c)] for c in result)
  return (result.encode('ascii')  # Make it bytes to allow decode.
          .decode('unicode_escape')
          # Make it bytes again to return the proper type.
          .encode('raw_unicode_escape'))

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