Class: CharDet::SJISProber

Inherits:
MultiByteCharSetProber show all
Defined in:
lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb

Instance Attribute Summary

Attributes inherited from CharSetProber

#active

Instance Method Summary collapse

Methods inherited from CharSetProber

#filter_high_bit_only, #filter_with_english_letters, #filter_without_english_letters, #get_state

Constructor Details

#initializeSJISProber

Returns a new instance of SJISProber.


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# File 'lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb', line 31

def initialize
  super()
  @_mCodingSM = CodingStateMachine.new(SJISSMModel)
  @_mDistributionAnalyzer = SJISDistributionAnalysis.new()
  @_mContextAnalyzer = SJISContextAnalysis.new()
  reset()
end

Instance Method Details

#feed(aBuf) ⇒ Object


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# File 'lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb', line 48

def feed(aBuf)
  aLen = aBuf.length
  for i in (0...aLen)
    codingState = @_mCodingSM.next_state(aBuf[i..i])
    if codingState == EError
      $stderr << "#{get_charset_name} prober hit error at byte #{i}\n" if $debug
      @_mState = ENotMe
      break
    elsif codingState == EItsMe
      @_mState = EFoundIt
      break
    elsif codingState == EStart
      charLen = @_mCodingSM.get_current_charlen()
      if i == 0
        @_mLastChar[1] = aBuf[0..0]
        @_mContextAnalyzer.feed(@_mLastChar[2 - charLen..-1], charLen)
        @_mDistributionAnalyzer.feed(@_mLastChar, charLen)
      else
        @_mContextAnalyzer.feed(aBuf[i + 1 - charLen ... i + 3 - charLen], charLen)
        @_mDistributionAnalyzer.feed(aBuf[i - 1 ... i + 1], charLen)
      end
    end
  end

  @_mLastChar[0] = aBuf[aLen - 1.. aLen-1]

  if get_state() == EDetecting
    if @_mContextAnalyzer.got_enough_data() and (get_confidence() > SHORTCUT_THRESHOLD)
      @_mState = EFoundIt
    end
  end

  return get_state()
end

#get_charset_nameObject


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# File 'lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb', line 44

def get_charset_name
  return "SHIFT_JIS"
end

#get_confidenceObject


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# File 'lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb', line 83

def get_confidence
  l = [@_mContextAnalyzer.get_confidence(), @_mDistributionAnalyzer.get_confidence()]
  return l.max
end

#resetObject


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# File 'lib/tmail/vendor/rchardet-1.3/lib/rchardet/sjisprober.rb', line 39

def reset
  super()
  @_mContextAnalyzer.reset()
end