mirror of https://github.com/pypa/pip
84 lines
3.2 KiB
Python
84 lines
3.2 KiB
Python
######################## BEGIN LICENSE BLOCK ########################
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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# 02110-1301 USA
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######################### END LICENSE BLOCK #########################
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from .universaldetector import UniversalDetector
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from .enums import InputState
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from .version import __version__, VERSION
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__all__ = ['UniversalDetector', 'detect', 'detect_all', '__version__', 'VERSION']
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def detect(byte_str):
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"""
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Detect the encoding of the given byte string.
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:param byte_str: The byte sequence to examine.
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:type byte_str: ``bytes`` or ``bytearray``
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"""
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if not isinstance(byte_str, bytearray):
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if not isinstance(byte_str, bytes):
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raise TypeError('Expected object of type bytes or bytearray, got: '
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'{}'.format(type(byte_str)))
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else:
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byte_str = bytearray(byte_str)
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detector = UniversalDetector()
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detector.feed(byte_str)
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return detector.close()
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def detect_all(byte_str):
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"""
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Detect all the possible encodings of the given byte string.
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:param byte_str: The byte sequence to examine.
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:type byte_str: ``bytes`` or ``bytearray``
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"""
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if not isinstance(byte_str, bytearray):
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if not isinstance(byte_str, bytes):
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raise TypeError('Expected object of type bytes or bytearray, got: '
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'{}'.format(type(byte_str)))
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else:
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byte_str = bytearray(byte_str)
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detector = UniversalDetector()
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detector.feed(byte_str)
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detector.close()
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if detector._input_state == InputState.HIGH_BYTE:
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results = []
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for prober in detector._charset_probers:
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if prober.get_confidence() > detector.MINIMUM_THRESHOLD:
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charset_name = prober.charset_name
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lower_charset_name = prober.charset_name.lower()
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# Use Windows encoding name instead of ISO-8859 if we saw any
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# extra Windows-specific bytes
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if lower_charset_name.startswith('iso-8859'):
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if detector._has_win_bytes:
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charset_name = detector.ISO_WIN_MAP.get(lower_charset_name,
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charset_name)
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results.append({
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'encoding': charset_name,
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'confidence': prober.get_confidence(),
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'language': prober.language,
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})
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if len(results) > 0:
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return sorted(results, key=lambda result: -result['confidence'])
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return [detector.result]
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