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Diffstat (limited to 'venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/chardet/chardistribution.py')
| -rw-r--r-- | venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/chardet/chardistribution.py | 233 |
1 files changed, 0 insertions, 233 deletions
diff --git a/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/chardet/chardistribution.py b/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/chardet/chardistribution.py deleted file mode 100644 index c0395f4..0000000 --- a/venv/Lib/site-packages/pip-19.0.3-py3.7.egg/pip/_vendor/chardet/chardistribution.py +++ /dev/null @@ -1,233 +0,0 @@ -######################## BEGIN LICENSE BLOCK ######################## -# The Original Code is Mozilla Communicator client code. -# -# The Initial Developer of the Original Code is -# Netscape Communications Corporation. -# Portions created by the Initial Developer are Copyright (C) 1998 -# the Initial Developer. All Rights Reserved. -# -# Contributor(s): -# Mark Pilgrim - port to Python -# -# 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 .euctwfreq import (EUCTW_CHAR_TO_FREQ_ORDER, EUCTW_TABLE_SIZE, - EUCTW_TYPICAL_DISTRIBUTION_RATIO) -from .euckrfreq import (EUCKR_CHAR_TO_FREQ_ORDER, EUCKR_TABLE_SIZE, - EUCKR_TYPICAL_DISTRIBUTION_RATIO) -from .gb2312freq import (GB2312_CHAR_TO_FREQ_ORDER, GB2312_TABLE_SIZE, - GB2312_TYPICAL_DISTRIBUTION_RATIO) -from .big5freq import (BIG5_CHAR_TO_FREQ_ORDER, BIG5_TABLE_SIZE, - BIG5_TYPICAL_DISTRIBUTION_RATIO) -from .jisfreq import (JIS_CHAR_TO_FREQ_ORDER, JIS_TABLE_SIZE, - JIS_TYPICAL_DISTRIBUTION_RATIO) - - -class CharDistributionAnalysis(object): - ENOUGH_DATA_THRESHOLD = 1024 - SURE_YES = 0.99 - SURE_NO = 0.01 - MINIMUM_DATA_THRESHOLD = 3 - - def __init__(self): - # Mapping table to get frequency order from char order (get from - # GetOrder()) - self._char_to_freq_order = None - self._table_size = None # Size of above table - # This is a constant value which varies from language to language, - # used in calculating confidence. See - # http://www.mozilla.org/projects/intl/UniversalCharsetDetection.html - # for further detail. - self.typical_distribution_ratio = None - self._done = None - self._total_chars = None - self._freq_chars = None - self.reset() - - def reset(self): - """reset analyser, clear any state""" - # If this flag is set to True, detection is done and conclusion has - # been made - self._done = False - self._total_chars = 0 # Total characters encountered - # The number of characters whose frequency order is less than 512 - self._freq_chars = 0 - - def feed(self, char, char_len): - """feed a character with known length""" - if char_len == 2: - # we only care about 2-bytes character in our distribution analysis - order = self.get_order(char) - else: - order = -1 - if order >= 0: - self._total_chars += 1 - # order is valid - if order < self._table_size: - if 512 > self._char_to_freq_order[order]: - self._freq_chars += 1 - - def get_confidence(self): - """return confidence based on existing data""" - # if we didn't receive any character in our consideration range, - # return negative answer - if self._total_chars <= 0 or self._freq_chars <= self.MINIMUM_DATA_THRESHOLD: - return self.SURE_NO - - if self._total_chars != self._freq_chars: - r = (self._freq_chars / ((self._total_chars - self._freq_chars) - * self.typical_distribution_ratio)) - if r < self.SURE_YES: - return r - - # normalize confidence (we don't want to be 100% sure) - return self.SURE_YES - - def got_enough_data(self): - # It is not necessary to receive all data to draw conclusion. - # For charset detection, certain amount of data is enough - return self._total_chars > self.ENOUGH_DATA_THRESHOLD - - def get_order(self, byte_str): - # We do not handle characters based on the original encoding string, - # but convert this encoding string to a number, here called order. - # This allows multiple encodings of a language to share one frequency - # table. - return -1 - - -class EUCTWDistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(EUCTWDistributionAnalysis, self).__init__() - self._char_to_freq_order = EUCTW_CHAR_TO_FREQ_ORDER - self._table_size = EUCTW_TABLE_SIZE - self.typical_distribution_ratio = EUCTW_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for euc-TW encoding, we are interested - # first byte range: 0xc4 -- 0xfe - # second byte range: 0xa1 -- 0xfe - # no validation needed here. State machine has done that - first_char = byte_str[0] - if first_char >= 0xC4: - return 94 * (first_char - 0xC4) + byte_str[1] - 0xA1 - else: - return -1 - - -class EUCKRDistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(EUCKRDistributionAnalysis, self).__init__() - self._char_to_freq_order = EUCKR_CHAR_TO_FREQ_ORDER - self._table_size = EUCKR_TABLE_SIZE - self.typical_distribution_ratio = EUCKR_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for euc-KR encoding, we are interested - # first byte range: 0xb0 -- 0xfe - # second byte range: 0xa1 -- 0xfe - # no validation needed here. State machine has done that - first_char = byte_str[0] - if first_char >= 0xB0: - return 94 * (first_char - 0xB0) + byte_str[1] - 0xA1 - else: - return -1 - - -class GB2312DistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(GB2312DistributionAnalysis, self).__init__() - self._char_to_freq_order = GB2312_CHAR_TO_FREQ_ORDER - self._table_size = GB2312_TABLE_SIZE - self.typical_distribution_ratio = GB2312_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for GB2312 encoding, we are interested - # first byte range: 0xb0 -- 0xfe - # second byte range: 0xa1 -- 0xfe - # no validation needed here. State machine has done that - first_char, second_char = byte_str[0], byte_str[1] - if (first_char >= 0xB0) and (second_char >= 0xA1): - return 94 * (first_char - 0xB0) + second_char - 0xA1 - else: - return -1 - - -class Big5DistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(Big5DistributionAnalysis, self).__init__() - self._char_to_freq_order = BIG5_CHAR_TO_FREQ_ORDER - self._table_size = BIG5_TABLE_SIZE - self.typical_distribution_ratio = BIG5_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for big5 encoding, we are interested - # first byte range: 0xa4 -- 0xfe - # second byte range: 0x40 -- 0x7e , 0xa1 -- 0xfe - # no validation needed here. State machine has done that - first_char, second_char = byte_str[0], byte_str[1] - if first_char >= 0xA4: - if second_char >= 0xA1: - return 157 * (first_char - 0xA4) + second_char - 0xA1 + 63 - else: - return 157 * (first_char - 0xA4) + second_char - 0x40 - else: - return -1 - - -class SJISDistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(SJISDistributionAnalysis, self).__init__() - self._char_to_freq_order = JIS_CHAR_TO_FREQ_ORDER - self._table_size = JIS_TABLE_SIZE - self.typical_distribution_ratio = JIS_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for sjis encoding, we are interested - # first byte range: 0x81 -- 0x9f , 0xe0 -- 0xfe - # second byte range: 0x40 -- 0x7e, 0x81 -- oxfe - # no validation needed here. State machine has done that - first_char, second_char = byte_str[0], byte_str[1] - if (first_char >= 0x81) and (first_char <= 0x9F): - order = 188 * (first_char - 0x81) - elif (first_char >= 0xE0) and (first_char <= 0xEF): - order = 188 * (first_char - 0xE0 + 31) - else: - return -1 - order = order + second_char - 0x40 - if second_char > 0x7F: - order = -1 - return order - - -class EUCJPDistributionAnalysis(CharDistributionAnalysis): - def __init__(self): - super(EUCJPDistributionAnalysis, self).__init__() - self._char_to_freq_order = JIS_CHAR_TO_FREQ_ORDER - self._table_size = JIS_TABLE_SIZE - self.typical_distribution_ratio = JIS_TYPICAL_DISTRIBUTION_RATIO - - def get_order(self, byte_str): - # for euc-JP encoding, we are interested - # first byte range: 0xa0 -- 0xfe - # second byte range: 0xa1 -- 0xfe - # no validation needed here. State machine has done that - char = byte_str[0] - if char >= 0xA0: - return 94 * (char - 0xA1) + byte_str[1] - 0xa1 - else: - return -1 |