FM / chardet

/snap/core24/1587/usr/lib/python3/dist-packages/chardet/

/snap/core24/1587/usr/lib/python3/dist-packages/chardet

Name	Size	Mode	Actions
cli/	-	0755	rm
metadata/	-	0755	rm
__pycache__/	-	0755	rm
big5freq.py	31274	0644	edit dl rm
big5prober.py	1763	0644	edit dl rm
chardistribution.py	10032	0644	edit dl rm
charsetgroupprober.py	3915	0644	edit dl rm
charsetprober.py	5420	0644	edit dl rm
codingstatemachine.py	3732	0644	edit dl rm
codingstatemachinedict.py	542	0644	edit dl rm
cp949prober.py	1860	0644	edit dl rm
enums.py	1683	0644	edit dl rm
escprober.py	4006	0644	edit dl rm
escsm.py	12176	0644	edit dl rm
eucjpprober.py	3934	0644	edit dl rm
euckrfreq.py	13566	0644	edit dl rm
euckrprober.py	1753	0644	edit dl rm
euctwfreq.py	36913	0644	edit dl rm
euctwprober.py	1753	0644	edit dl rm
gb2312freq.py	20735	0644	edit dl rm
gb2312prober.py	1759	0644	edit dl rm
hebrewprober.py	14537	0644	edit dl rm
jisfreq.py	25796	0644	edit dl rm
johabfreq.py	42498	0644	edit dl rm
johabprober.py	1752	0644	edit dl rm
jpcntx.py	27055	0644	edit dl rm
langbulgarianmodel.py	104550	0644	edit dl rm
langgreekmodel.py	98472	0644	edit dl rm
langhebrewmodel.py	98184	0644	edit dl rm
langhungarianmodel.py	101351	0644	edit dl rm
langrussianmodel.py	128023	0644	edit dl rm
langthaimodel.py	102762	0644	edit dl rm
langturkishmodel.py	95360	0644	edit dl rm
latin1prober.py	5380	0644	edit dl rm
macromanprober.py	6077	0644	edit dl rm
mbcharsetprober.py	3715	0644	edit dl rm
mbcsgroupprober.py	2131	0644	edit dl rm
mbcssm.py	30391	0644	edit dl rm
py.typed	0	0644	edit dl rm
resultdict.py	402	0644	edit dl rm
sbcharsetprober.py	6400	0644	edit dl rm
sbcsgroupprober.py	4137	0644	edit dl rm
sjisprober.py	4007	0644	edit dl rm
universaldetector.py	14848	0644	edit dl rm
utf8prober.py	2812	0644	edit dl rm
utf1632prober.py	8505	0644	edit dl rm
version.py	244	0644	edit dl rm
__init__.py	4797	0644	edit dl rm
__main__.py	123	0644	edit dl rm

Edit: /snap/core24/1587/usr/lib/python3/dist-packages/chardet/universaldetector.py (14848B)

######################## BEGIN LICENSE BLOCK ########################
# The Original Code is Mozilla Universal charset detector code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 2001
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Mark Pilgrim - port to Python
#   Shy Shalom - original C code
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301  USA
######################### END LICENSE BLOCK #########################
"""
Module containing the UniversalDetector detector class, which is the primary
class a user of ``chardet`` should use.

:author: Mark Pilgrim (initial port to Python)
:author: Shy Shalom (original C code)
:author: Dan Blanchard (major refactoring for 3.0)
:author: Ian Cordasco
"""

import codecs
import logging
import re
from typing import List, Optional, Union

from .charsetgroupprober import CharSetGroupProber
from .charsetprober import CharSetProber
from .enums import InputState, LanguageFilter, ProbingState
from .escprober import EscCharSetProber
from .latin1prober import Latin1Prober
from .macromanprober import MacRomanProber
from .mbcsgroupprober import MBCSGroupProber
from .resultdict import ResultDict
from .sbcsgroupprober import SBCSGroupProber
from .utf1632prober import UTF1632Prober

class UniversalDetector:
    """
    The ``UniversalDetector`` class underlies the ``chardet.detect`` function
    and coordinates all of the different charset probers.

To get a ``dict`` containing an encoding and its confidence, you can simply
    run:

.. code::

u = UniversalDetector()
            u.feed(some_bytes)
            u.close()
            detected = u.result

"""

MINIMUM_THRESHOLD = 0.20
    HIGH_BYTE_DETECTOR = re.compile(b"[\x80-\xFF]")
    ESC_DETECTOR = re.compile(b"(\033|~{)")
    WIN_BYTE_DETECTOR = re.compile(b"[\x80-\x9F]")
    ISO_WIN_MAP = {
        "iso-8859-1": "Windows-1252",
        "iso-8859-2": "Windows-1250",
        "iso-8859-5": "Windows-1251",
        "iso-8859-6": "Windows-1256",
        "iso-8859-7": "Windows-1253",
        "iso-8859-8": "Windows-1255",
        "iso-8859-9": "Windows-1254",
        "iso-8859-13": "Windows-1257",
    }
    # Based on https://encoding.spec.whatwg.org/#names-and-labels
    # but altered to match Python names for encodings and remove mappings
    # that break tests.
    LEGACY_MAP = {
        "ascii": "Windows-1252",
        "iso-8859-1": "Windows-1252",
        "tis-620": "ISO-8859-11",
        "iso-8859-9": "Windows-1254",
        "gb2312": "GB18030",
        "euc-kr": "CP949",
        "utf-16le": "UTF-16",
    }

def __init__(
        self,
        lang_filter: LanguageFilter = LanguageFilter.ALL,
        should_rename_legacy: bool = False,
    ) -> None:
        self._esc_charset_prober: Optional[EscCharSetProber] = None
        self._utf1632_prober: Optional[UTF1632Prober] = None
        self._charset_probers: List[CharSetProber] = []
        self.result: ResultDict = {
            "encoding": None,
            "confidence": 0.0,
            "language": None,
        }
        self.done = False
        self._got_data = False
        self._input_state = InputState.PURE_ASCII
        self._last_char = b""
        self.lang_filter = lang_filter
        self.logger = logging.getLogger(__name__)
        self._has_win_bytes = False
        self.should_rename_legacy = should_rename_legacy
        self.reset()

@property
    def input_state(self) -> int:
        return self._input_state

@property
    def has_win_bytes(self) -> bool:
        return self._has_win_bytes

@property
    def charset_probers(self) -> List[CharSetProber]:
        return self._charset_probers

def reset(self) -> None:
        """
        Reset the UniversalDetector and all of its probers back to their
        initial states.  This is called by ``__init__``, so you only need to
        call this directly in between analyses of different documents.
        """
        self.result = {"encoding": None, "confidence": 0.0, "language": None}
        self.done = False
        self._got_data = False
        self._has_win_bytes = False
        self._input_state = InputState.PURE_ASCII
        self._last_char = b""
        if self._esc_charset_prober:
            self._esc_charset_prober.reset()
        if self._utf1632_prober:
            self._utf1632_prober.reset()
        for prober in self._charset_probers:
            prober.reset()

def feed(self, byte_str: Union[bytes, bytearray]) -> None:
        """
        Takes a chunk of a document and feeds it through all of the relevant
        charset probers.

After calling ``feed``, you can check the value of the ``done``
        attribute to see if you need to continue feeding the
        ``UniversalDetector`` more data, or if it has made a prediction
        (in the ``result`` attribute).

.. note::
           You should always call ``close`` when you're done feeding in your
           document if ``done`` is not already ``True``.
        """
        if self.done:
            return

if not byte_str:
            return

if not isinstance(byte_str, bytearray):
            byte_str = bytearray(byte_str)

# First check for known BOMs, since these are guaranteed to be correct
        if not self._got_data:
            # If the data starts with BOM, we know it is UTF
            if byte_str.startswith(codecs.BOM_UTF8):
                # EF BB BF  UTF-8 with BOM
                self.result = {
                    "encoding": "UTF-8-SIG",
                    "confidence": 1.0,
                    "language": "",
                }
            elif byte_str.startswith((codecs.BOM_UTF32_LE, codecs.BOM_UTF32_BE)):
                # FF FE 00 00  UTF-32, little-endian BOM
                # 00 00 FE FF  UTF-32, big-endian BOM
                self.result = {"encoding": "UTF-32", "confidence": 1.0, "language": ""}
            elif byte_str.startswith(b"\xFE\xFF\x00\x00"):
                # FE FF 00 00  UCS-4, unusual octet order BOM (3412)
                self.result = {
                    # TODO: This encoding is not supported by Python. Should remove?
                    "encoding": "X-ISO-10646-UCS-4-3412",
                    "confidence": 1.0,
                    "language": "",
                }
            elif byte_str.startswith(b"\x00\x00\xFF\xFE"):
                # 00 00 FF FE  UCS-4, unusual octet order BOM (2143)
                self.result = {
                    # TODO: This encoding is not supported by Python. Should remove?
                    "encoding": "X-ISO-10646-UCS-4-2143",
                    "confidence": 1.0,
                    "language": "",
                }
            elif byte_str.startswith((codecs.BOM_LE, codecs.BOM_BE)):
                # FF FE  UTF-16, little endian BOM
                # FE FF  UTF-16, big endian BOM
                self.result = {"encoding": "UTF-16", "confidence": 1.0, "language": ""}

self._got_data = True
            if self.result["encoding"] is not None:
                self.done = True
                return

# If none of those matched and we've only see ASCII so far, check
        # for high bytes and escape sequences
        if self._input_state == InputState.PURE_ASCII:
            if self.HIGH_BYTE_DETECTOR.search(byte_str):
                self._input_state = InputState.HIGH_BYTE
            elif (
                self._input_state == InputState.PURE_ASCII
                and self.ESC_DETECTOR.search(self._last_char + byte_str)
            ):
                self._input_state = InputState.ESC_ASCII

self._last_char = byte_str[-1:]

# next we will look to see if it is appears to be either a UTF-16 or
        # UTF-32 encoding
        if not self._utf1632_prober:
            self._utf1632_prober = UTF1632Prober()

if self._utf1632_prober.state == ProbingState.DETECTING:
            if self._utf1632_prober.feed(byte_str) == ProbingState.FOUND_IT:
                self.result = {
                    "encoding": self._utf1632_prober.charset_name,
                    "confidence": self._utf1632_prober.get_confidence(),
                    "language": "",
                }
                self.done = True
                return

# If we've seen escape sequences, use the EscCharSetProber, which
        # uses a simple state machine to check for known escape sequences in
        # HZ and ISO-2022 encodings, since those are the only encodings that
        # use such sequences.
        if self._input_state == InputState.ESC_ASCII:
            if not self._esc_charset_prober:
                self._esc_charset_prober = EscCharSetProber(self.lang_filter)
            if self._esc_charset_prober.feed(byte_str) == ProbingState.FOUND_IT:
                self.result = {
                    "encoding": self._esc_charset_prober.charset_name,
                    "confidence": self._esc_charset_prober.get_confidence(),
                    "language": self._esc_charset_prober.language,
                }
                self.done = True
        # If we've seen high bytes (i.e., those with values greater than 127),
        # we need to do more complicated checks using all our multi-byte and
        # single-byte probers that are left.  The single-byte probers
        # use character bigram distributions to determine the encoding, whereas
        # the multi-byte probers use a combination of character unigram and
        # bigram distributions.
        elif self._input_state == InputState.HIGH_BYTE:
            if not self._charset_probers:
                self._charset_probers = [MBCSGroupProber(self.lang_filter)]
                # If we're checking non-CJK encodings, use single-byte prober
                if self.lang_filter & LanguageFilter.NON_CJK:
                    self._charset_probers.append(SBCSGroupProber())
                self._charset_probers.append(Latin1Prober())
                self._charset_probers.append(MacRomanProber())
            for prober in self._charset_probers:
                if prober.feed(byte_str) == ProbingState.FOUND_IT:
                    self.result = {
                        "encoding": prober.charset_name,
                        "confidence": prober.get_confidence(),
                        "language": prober.language,
                    }
                    self.done = True
                    break
            if self.WIN_BYTE_DETECTOR.search(byte_str):
                self._has_win_bytes = True

def close(self) -> ResultDict:
        """
        Stop analyzing the current document and come up with a final
        prediction.

:returns:  The ``result`` attribute, a ``dict`` with the keys
                   `encoding`, `confidence`, and `language`.
        """
        # Don't bother with checks if we're already done
        if self.done:
            return self.result
        self.done = True

if not self._got_data:
            self.logger.debug("no data received!")

# Default to ASCII if it is all we've seen so far
        elif self._input_state == InputState.PURE_ASCII:
            self.result = {"encoding": "ascii", "confidence": 1.0, "language": ""}

# If we have seen non-ASCII, return the best that met MINIMUM_THRESHOLD
        elif self._input_state == InputState.HIGH_BYTE:
            prober_confidence = None
            max_prober_confidence = 0.0
            max_prober = None
            for prober in self._charset_probers:
                if not prober:
                    continue
                prober_confidence = prober.get_confidence()
                if prober_confidence > max_prober_confidence:
                    max_prober_confidence = prober_confidence
                    max_prober = prober
            if max_prober and (max_prober_confidence > self.MINIMUM_THRESHOLD):
                charset_name = max_prober.charset_name
                assert charset_name is not None
                lower_charset_name = charset_name.lower()
                confidence = max_prober.get_confidence()
                # Use Windows encoding name instead of ISO-8859 if we saw any
                # extra Windows-specific bytes
                if lower_charset_name.startswith("iso-8859"):
                    if self._has_win_bytes:
                        charset_name = self.ISO_WIN_MAP.get(
                            lower_charset_name, charset_name
                        )
                # Rename legacy encodings with superset encodings if asked
                if self.should_rename_legacy:
                    charset_name = self.LEGACY_MAP.get(
                        (charset_name or "").lower(), charset_name
                    )
                self.result = {
                    "encoding": charset_name,
                    "confidence": confidence,
                    "language": max_prober.language,
                }

# Log all prober confidences if none met MINIMUM_THRESHOLD
        if self.logger.getEffectiveLevel() <= logging.DEBUG:
            if self.result["encoding"] is None:
                self.logger.debug("no probers hit minimum threshold")
                for group_prober in self._charset_probers:
                    if not group_prober:
                        continue
                    if isinstance(group_prober, CharSetGroupProber):
                        for prober in group_prober.probers:
                            self.logger.debug(
                                "%s %s confidence = %s",
                                prober.charset_name,
                                prober.language,
                                prober.get_confidence(),
                            )
                    else:
                        self.logger.debug(
                            "%s %s confidence = %s",
                            group_prober.charset_name,
                            group_prober.language,
                            group_prober.get_confidence(),
                        )
        return self.result

cmd: