diff options
Diffstat (limited to 'third_party/python/chardet/chardet/jpcntx.py')
-rw-r--r-- | third_party/python/chardet/chardet/jpcntx.py | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/third_party/python/chardet/chardet/jpcntx.py b/third_party/python/chardet/chardet/jpcntx.py new file mode 100644 index 0000000000..20044e4bc8 --- /dev/null +++ b/third_party/python/chardet/chardet/jpcntx.py @@ -0,0 +1,233 @@ +######################## 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 ######################### + + +# This is hiragana 2-char sequence table, the number in each cell represents its frequency category +jp2CharContext = ( +(0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1), +(2,4,0,4,0,3,0,4,0,3,4,4,4,2,4,3,3,4,3,2,3,3,4,2,3,3,3,2,4,1,4,3,3,1,5,4,3,4,3,4,3,5,3,0,3,5,4,2,0,3,1,0,3,3,0,3,3,0,1,1,0,4,3,0,3,3,0,4,0,2,0,3,5,5,5,5,4,0,4,1,0,3,4), +(0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2), 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+(0,1,0,4,0,5,0,4,0,2,4,4,2,3,3,2,3,3,5,3,3,3,4,3,4,2,3,0,4,3,3,3,4,1,4,3,2,1,5,5,3,4,5,1,3,5,4,2,0,3,3,0,1,3,0,4,2,0,1,3,1,4,3,3,3,3,0,3,0,1,0,3,4,4,4,5,5,0,3,0,1,4,5), +(0,2,0,3,0,3,0,0,0,2,3,1,3,0,4,0,1,1,3,0,3,4,3,2,3,1,0,3,3,2,3,1,3,0,2,3,0,2,1,4,1,2,2,0,0,3,3,0,0,2,0,0,0,1,0,0,0,0,2,2,0,3,2,1,3,3,0,2,0,2,0,0,3,3,1,2,4,0,3,0,2,2,3), +(2,4,0,5,0,4,0,4,0,2,4,4,4,3,4,3,3,3,1,2,4,3,4,3,4,4,5,0,3,3,3,3,2,0,4,3,1,4,3,4,1,4,4,3,3,4,4,3,1,2,3,0,4,2,0,4,1,0,3,3,0,4,3,3,3,4,0,4,0,2,0,3,5,3,4,5,2,0,3,0,0,4,5), +(0,3,0,4,0,1,0,1,0,1,3,2,2,1,3,0,3,0,2,0,2,0,3,0,2,0,0,0,1,0,1,1,0,0,3,1,0,0,0,4,0,3,1,0,2,1,3,0,0,0,0,0,0,3,0,0,0,0,0,0,0,4,2,2,3,1,0,3,0,0,0,1,4,4,4,3,0,0,4,0,0,1,4), +(1,4,1,5,0,3,0,3,0,4,5,4,4,3,5,3,3,4,4,3,4,1,3,3,3,3,2,1,4,1,5,4,3,1,4,4,3,5,4,4,3,5,4,3,3,4,4,4,0,3,3,1,2,3,0,3,1,0,3,3,0,5,4,4,4,4,4,4,3,3,5,4,4,3,3,5,4,0,3,2,0,4,4), 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+(0,3,0,3,0,2,0,3,0,1,5,4,3,3,3,1,4,2,1,2,3,4,4,2,4,4,5,0,3,1,4,3,4,0,4,3,3,3,2,3,2,5,3,4,3,2,2,3,0,0,3,0,2,1,0,1,2,0,0,0,0,2,1,1,3,1,0,2,0,4,0,3,4,4,4,5,2,0,2,0,0,1,3), +(0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,1,1,0,0,1,1,0,0,0,4,2,1,1,0,1,0,3,2,0,0,3,1,1,1,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,3,0,1,0,0,0,2,0,0,0,1,4,0,4,2,1,0,0,0,0,0,1), +(0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,1,0,0,0,0,0,0,1,0,1,0,0,0,0,3,1,0,0,0,2,0,2,1,0,0,1,2,1,0,1,1,0,0,3,0,0,0,0,0,0,0,0,0,0,0,1,3,1,0,0,0,0,0,1,0,0,2,1,0,0,0,0,0,0,0,0,2), +(0,4,0,4,0,4,0,3,0,4,4,3,4,2,4,3,2,0,4,4,4,3,5,3,5,3,3,2,4,2,4,3,4,3,1,4,0,2,3,4,4,4,3,3,3,4,4,4,3,4,1,3,4,3,2,1,2,1,3,3,3,4,4,3,3,5,0,4,0,3,0,4,3,3,3,2,1,0,3,0,0,3,3), +(0,4,0,3,0,3,0,3,0,3,5,5,3,3,3,3,4,3,4,3,3,3,4,4,4,3,3,3,3,4,3,5,3,3,1,3,2,4,5,5,5,5,4,3,4,5,5,3,2,2,3,3,3,3,2,3,3,1,2,3,2,4,3,3,3,4,0,4,0,2,0,4,3,2,2,1,2,0,3,0,0,4,1), +) + +class JapaneseContextAnalysis(object): + NUM_OF_CATEGORY = 6 + DONT_KNOW = -1 + ENOUGH_REL_THRESHOLD = 100 + MAX_REL_THRESHOLD = 1000 + MINIMUM_DATA_THRESHOLD = 4 + + def __init__(self): + self._total_rel = None + self._rel_sample = None + self._need_to_skip_char_num = None + self._last_char_order = None + self._done = None + self.reset() + + def reset(self): + self._total_rel = 0 # total sequence received + # category counters, each integer counts sequence in its category + self._rel_sample = [0] * self.NUM_OF_CATEGORY + # if last byte in current buffer is not the last byte of a character, + # we need to know how many bytes to skip in next buffer + self._need_to_skip_char_num = 0 + self._last_char_order = -1 # The order of previous char + # If this flag is set to True, detection is done and conclusion has + # been made + self._done = False + + def feed(self, byte_str, num_bytes): + if self._done: + return + + # The buffer we got is byte oriented, and a character may span in more than one + # buffers. In case the last one or two byte in last buffer is not + # complete, we record how many byte needed to complete that character + # and skip these bytes here. We can choose to record those bytes as + # well and analyse the character once it is complete, but since a + # character will not make much difference, by simply skipping + # this character will simply our logic and improve performance. + i = self._need_to_skip_char_num + while i < num_bytes: + order, char_len = self.get_order(byte_str[i:i + 2]) + i += char_len + if i > num_bytes: + self._need_to_skip_char_num = i - num_bytes + self._last_char_order = -1 + else: + if (order != -1) and (self._last_char_order != -1): + self._total_rel += 1 + if self._total_rel > self.MAX_REL_THRESHOLD: + self._done = True + break + self._rel_sample[jp2CharContext[self._last_char_order][order]] += 1 + self._last_char_order = order + + def got_enough_data(self): + return self._total_rel > self.ENOUGH_REL_THRESHOLD + + def get_confidence(self): + # This is just one way to calculate confidence. It works well for me. + if self._total_rel > self.MINIMUM_DATA_THRESHOLD: + return (self._total_rel - self._rel_sample[0]) / self._total_rel + else: + return self.DONT_KNOW + + def get_order(self, byte_str): + return -1, 1 + +class SJISContextAnalysis(JapaneseContextAnalysis): + def __init__(self): + super(SJISContextAnalysis, self).__init__() + self._charset_name = "SHIFT_JIS" + + @property + def charset_name(self): + return self._charset_name + + def get_order(self, byte_str): + if not byte_str: + return -1, 1 + # find out current char's byte length + first_char = byte_str[0] + if (0x81 <= first_char <= 0x9F) or (0xE0 <= first_char <= 0xFC): + char_len = 2 + if (first_char == 0x87) or (0xFA <= first_char <= 0xFC): + self._charset_name = "CP932" + else: + char_len = 1 + + # return its order if it is hiragana + if len(byte_str) > 1: + second_char = byte_str[1] + if (first_char == 202) and (0x9F <= second_char <= 0xF1): + return second_char - 0x9F, char_len + + return -1, char_len + +class EUCJPContextAnalysis(JapaneseContextAnalysis): + def get_order(self, byte_str): + if not byte_str: + return -1, 1 + # find out current char's byte length + first_char = byte_str[0] + if (first_char == 0x8E) or (0xA1 <= first_char <= 0xFE): + char_len = 2 + elif first_char == 0x8F: + char_len = 3 + else: + char_len = 1 + + # return its order if it is hiragana + if len(byte_str) > 1: + second_char = byte_str[1] + if (first_char == 0xA4) and (0xA1 <= second_char <= 0xF3): + return second_char - 0xA1, char_len + + return -1, char_len + + |