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annotate venv/lib/python2.7/site-packages/requests/packages/chardet/utf8prober.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 from . import constants
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29 from .charsetprober import CharSetProber
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30 from .codingstatemachine import CodingStateMachine
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31 from .mbcssm import UTF8SMModel
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32
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33 ONE_CHAR_PROB = 0.5
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34
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35
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36 class UTF8Prober(CharSetProber):
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37 def __init__(self):
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38 CharSetProber.__init__(self)
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39 self._mCodingSM = CodingStateMachine(UTF8SMModel)
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40 self.reset()
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41
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42 def reset(self):
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43 CharSetProber.reset(self)
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44 self._mCodingSM.reset()
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45 self._mNumOfMBChar = 0
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46
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47 def get_charset_name(self):
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48 return "utf-8"
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49
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50 def feed(self, aBuf):
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51 for c in aBuf:
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52 codingState = self._mCodingSM.next_state(c)
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53 if codingState == constants.eError:
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54 self._mState = constants.eNotMe
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55 break
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56 elif codingState == constants.eItsMe:
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57 self._mState = constants.eFoundIt
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58 break
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59 elif codingState == constants.eStart:
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60 if self._mCodingSM.get_current_charlen() >= 2:
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61 self._mNumOfMBChar += 1
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62
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63 if self.get_state() == constants.eDetecting:
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64 if self.get_confidence() > constants.SHORTCUT_THRESHOLD:
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65 self._mState = constants.eFoundIt
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66
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67 return self.get_state()
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68
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69 def get_confidence(self):
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70 unlike = 0.99
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71 if self._mNumOfMBChar < 6:
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72 for i in range(0, self._mNumOfMBChar):
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73 unlike = unlike * ONE_CHAR_PROB
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74 return 1.0 - unlike
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75 else:
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76 return unlike