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annotate venv/lib/python2.7/site-packages/requests/packages/chardet/eucjpprober.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 ######################## BEGIN LICENSE BLOCK ########################
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2 # The Original Code is mozilla.org code.
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3 #
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4 # The Initial Developer of the Original Code is
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5 # Netscape Communications Corporation.
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6 # Portions created by the Initial Developer are Copyright (C) 1998
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7 # the Initial Developer. All Rights Reserved.
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8 #
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9 # Contributor(s):
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10 # Mark Pilgrim - port to Python
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11 #
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12 # This library is free software; you can redistribute it and/or
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13 # modify it under the terms of the GNU Lesser General Public
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14 # License as published by the Free Software Foundation; either
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15 # version 2.1 of the License, or (at your option) any later version.
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16 #
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17 # This library is distributed in the hope that it will be useful,
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18 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 # Lesser General Public License for more details.
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21 #
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22 # You should have received a copy of the GNU Lesser General Public
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23 # License along with this library; if not, write to the Free Software
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24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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25 # 02110-1301 USA
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26 ######################### END LICENSE BLOCK #########################
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27
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28 import sys
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29 from . import constants
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30 from .mbcharsetprober import MultiByteCharSetProber
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31 from .codingstatemachine import CodingStateMachine
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32 from .chardistribution import EUCJPDistributionAnalysis
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33 from .jpcntx import EUCJPContextAnalysis
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34 from .mbcssm import EUCJPSMModel
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35
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36
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37 class EUCJPProber(MultiByteCharSetProber):
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38 def __init__(self):
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39 MultiByteCharSetProber.__init__(self)
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40 self._mCodingSM = CodingStateMachine(EUCJPSMModel)
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41 self._mDistributionAnalyzer = EUCJPDistributionAnalysis()
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42 self._mContextAnalyzer = EUCJPContextAnalysis()
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43 self.reset()
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44
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45 def reset(self):
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46 MultiByteCharSetProber.reset(self)
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47 self._mContextAnalyzer.reset()
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48
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49 def get_charset_name(self):
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50 return "EUC-JP"
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51
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52 def feed(self, aBuf):
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53 aLen = len(aBuf)
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54 for i in range(0, aLen):
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55 # PY3K: aBuf is a byte array, so aBuf[i] is an int, not a byte
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56 codingState = self._mCodingSM.next_state(aBuf[i])
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57 if codingState == constants.eError:
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58 if constants._debug:
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59 sys.stderr.write(self.get_charset_name()
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60 + ' prober hit error at byte ' + str(i)
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61 + '\n')
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62 self._mState = constants.eNotMe
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63 break
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64 elif codingState == constants.eItsMe:
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65 self._mState = constants.eFoundIt
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66 break
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67 elif codingState == constants.eStart:
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68 charLen = self._mCodingSM.get_current_charlen()
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69 if i == 0:
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70 self._mLastChar[1] = aBuf[0]
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71 self._mContextAnalyzer.feed(self._mLastChar, charLen)
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72 self._mDistributionAnalyzer.feed(self._mLastChar, charLen)
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73 else:
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74 self._mContextAnalyzer.feed(aBuf[i - 1:i + 1], charLen)
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75 self._mDistributionAnalyzer.feed(aBuf[i - 1:i + 1],
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76 charLen)
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77
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78 self._mLastChar[0] = aBuf[aLen - 1]
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79
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80 if self.get_state() == constants.eDetecting:
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81 if (self._mContextAnalyzer.got_enough_data() and
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82 (self.get_confidence() > constants.SHORTCUT_THRESHOLD)):
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83 self._mState = constants.eFoundIt
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84
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85 return self.get_state()
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86
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87 def get_confidence(self):
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88 contxtCf = self._mContextAnalyzer.get_confidence()
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89 distribCf = self._mDistributionAnalyzer.get_confidence()
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90 return max(contxtCf, distribCf)