Class: CharDet::SJISProber

Inherits:
MultiByteCharSetProber show all
Defined in:
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, #result, #state

Constructor Details

#initialize ⇒ SJISProber

Returns a new instance of SJISProber.



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# File 'lib/rchardet/sjisprober.rb', line 31

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

Instance Method Details

#charset_name ⇒ Object 



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# File 'lib/rchardet/sjisprober.rb', line 44

def charset_name
  return "SHIFT_JIS"
end

#confidence ⇒ Object 



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# File 'lib/rchardet/sjisprober.rb', line 83

def confidence
  l = [@_mContextAnalyzer.confidence, @_mDistributionAnalyzer.confidence]
  return l.max
end

#feed(aBuf) ⇒ Object 



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# File '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 << "#{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.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 state == EDetecting
    if @_mContextAnalyzer.got_enough_data() and (confidence > SHORTCUT_THRESHOLD)
      @_mState = EFoundIt
    end
  end

  return state
end

#reset ⇒ Object 



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# File 'lib/rchardet/sjisprober.rb', line 39

def reset
  super
  @_mContextAnalyzer.reset
end