Class: CharDet::UTF8Prober

Inherits:
CharSetProber show all
Defined in:
lib/rchardet/utf8prober.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 ⇒ UTF8Prober

Returns a new instance of UTF8Prober.



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# File 'lib/rchardet/utf8prober.rb', line 33

def initialize
  super()
  @_mCodingSM = CodingStateMachine.new(UTF8SMModel)
  reset()
end

Instance Method Details

#charset_name ⇒ Object 



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# File 'lib/rchardet/utf8prober.rb', line 45

def charset_name
  return "UTF-8"
end

#confidence ⇒ Object 



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# File 'lib/rchardet/utf8prober.rb', line 75

def confidence
  unlike = 0.99
  if @_mNumOfMBChar < 6
    (0...@_mNumOfMBChar).each do
      unlike *= ONE_CHAR_PROB
    end
    return 1.0 - unlike
  else
    return unlike
  end
end

#feed(aBuf) ⇒ Object 



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# File 'lib/rchardet/utf8prober.rb', line 49

def feed(aBuf)
  aBuf.each_byte do |b|
    c = b.chr
    codingState = @_mCodingSM.next_state(c)
    if codingState == EError
      @_mState = ENotMe
      break
    elsif codingState == EItsMe
      @_mState = EFoundIt
      break
    elsif codingState == EStart
      if @_mCodingSM.current_charlen >= 2
        @_mNumOfMBChar += 1
      end
    end
  end

  if state == EDetecting
    if confidence > SHORTCUT_THRESHOLD
      @_mState = EFoundIt
    end
  end

  return state
end

#reset ⇒ Object 



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# File 'lib/rchardet/utf8prober.rb', line 39

def reset
  super()
  @_mCodingSM.reset()
  @_mNumOfMBChar = 0
end