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| ######################## 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 ######################### | |
| from typing import List, Union | |
| from .charsetprober import CharSetProber | |
| from .enums import ProbingState | |
| FREQ_CAT_NUM = 4 | |
| UDF = 0 # undefined | |
| OTH = 1 # other | |
| ASC = 2 # ascii capital letter | |
| ASS = 3 # ascii small letter | |
| ACV = 4 # accent capital vowel | |
| ACO = 5 # accent capital other | |
| ASV = 6 # accent small vowel | |
| ASO = 7 # accent small other | |
| CLASS_NUM = 8 # total classes | |
| # fmt: off | |
| Latin1_CharToClass = ( | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 00 - 07 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 08 - 0F | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 10 - 17 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 18 - 1F | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 20 - 27 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 28 - 2F | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 30 - 37 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 38 - 3F | |
| OTH, ASC, ASC, ASC, ASC, ASC, ASC, ASC, # 40 - 47 | |
| ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, # 48 - 4F | |
| ASC, ASC, ASC, ASC, ASC, ASC, ASC, ASC, # 50 - 57 | |
| ASC, ASC, ASC, OTH, OTH, OTH, OTH, OTH, # 58 - 5F | |
| OTH, ASS, ASS, ASS, ASS, ASS, ASS, ASS, # 60 - 67 | |
| ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, # 68 - 6F | |
| ASS, ASS, ASS, ASS, ASS, ASS, ASS, ASS, # 70 - 77 | |
| ASS, ASS, ASS, OTH, OTH, OTH, OTH, OTH, # 78 - 7F | |
| OTH, UDF, OTH, ASO, OTH, OTH, OTH, OTH, # 80 - 87 | |
| OTH, OTH, ACO, OTH, ACO, UDF, ACO, UDF, # 88 - 8F | |
| UDF, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # 90 - 97 | |
| OTH, OTH, ASO, OTH, ASO, UDF, ASO, ACO, # 98 - 9F | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # A0 - A7 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # A8 - AF | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # B0 - B7 | |
| OTH, OTH, OTH, OTH, OTH, OTH, OTH, OTH, # B8 - BF | |
| ACV, ACV, ACV, ACV, ACV, ACV, ACO, ACO, # C0 - C7 | |
| ACV, ACV, ACV, ACV, ACV, ACV, ACV, ACV, # C8 - CF | |
| ACO, ACO, ACV, ACV, ACV, ACV, ACV, OTH, # D0 - D7 | |
| ACV, ACV, ACV, ACV, ACV, ACO, ACO, ACO, # D8 - DF | |
| ASV, ASV, ASV, ASV, ASV, ASV, ASO, ASO, # E0 - E7 | |
| ASV, ASV, ASV, ASV, ASV, ASV, ASV, ASV, # E8 - EF | |
| ASO, ASO, ASV, ASV, ASV, ASV, ASV, OTH, # F0 - F7 | |
| ASV, ASV, ASV, ASV, ASV, ASO, ASO, ASO, # F8 - FF | |
| ) | |
| # 0 : illegal | |
| # 1 : very unlikely | |
| # 2 : normal | |
| # 3 : very likely | |
| Latin1ClassModel = ( | |
| # UDF OTH ASC ASS ACV ACO ASV ASO | |
| 0, 0, 0, 0, 0, 0, 0, 0, # UDF | |
| 0, 3, 3, 3, 3, 3, 3, 3, # OTH | |
| 0, 3, 3, 3, 3, 3, 3, 3, # ASC | |
| 0, 3, 3, 3, 1, 1, 3, 3, # ASS | |
| 0, 3, 3, 3, 1, 2, 1, 2, # ACV | |
| 0, 3, 3, 3, 3, 3, 3, 3, # ACO | |
| 0, 3, 1, 3, 1, 1, 1, 3, # ASV | |
| 0, 3, 1, 3, 1, 1, 3, 3, # ASO | |
| ) | |
| # fmt: on | |
| class Latin1Prober(CharSetProber): | |
| def __init__(self) -> None: | |
| super().__init__() | |
| self._last_char_class = OTH | |
| self._freq_counter: List[int] = [] | |
| self.reset() | |
| def reset(self) -> None: | |
| self._last_char_class = OTH | |
| self._freq_counter = [0] * FREQ_CAT_NUM | |
| super().reset() | |
| def charset_name(self) -> str: | |
| return "ISO-8859-1" | |
| def language(self) -> str: | |
| return "" | |
| def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState: | |
| byte_str = self.remove_xml_tags(byte_str) | |
| for c in byte_str: | |
| char_class = Latin1_CharToClass[c] | |
| freq = Latin1ClassModel[(self._last_char_class * CLASS_NUM) + char_class] | |
| if freq == 0: | |
| self._state = ProbingState.NOT_ME | |
| break | |
| self._freq_counter[freq] += 1 | |
| self._last_char_class = char_class | |
| return self.state | |
| def get_confidence(self) -> float: | |
| if self.state == ProbingState.NOT_ME: | |
| return 0.01 | |
| total = sum(self._freq_counter) | |
| confidence = ( | |
| 0.0 | |
| if total < 0.01 | |
| else (self._freq_counter[3] - self._freq_counter[1] * 20.0) / total | |
| ) | |
| confidence = max(confidence, 0.0) | |
| # lower the confidence of latin1 so that other more accurate | |
| # detector can take priority. | |
| confidence *= 0.73 | |
| return confidence | |