88 lines
2.3 KiB
Ruby
Executable File
88 lines
2.3 KiB
Ruby
Executable File
######################## BEGIN LICENSE BLOCK ########################
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# The Original Code is mozilla.org code.
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#
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# The Initial Developer of the Original Code is
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# Netscape Communications Corporation.
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# Portions created by the Initial Developer are Copyright (C) 1998
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Jeff Hodges - port to Ruby
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# Mark Pilgrim - port to Python
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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# 02110-1301 USA
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######################### END LICENSE BLOCK #########################
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module CharDet
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ONE_CHAR_PROB = 0.5
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class UTF8Prober < CharSetProber
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def initialize
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super()
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@_mCodingSM = CodingStateMachine.new(UTF8SMModel)
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reset()
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end
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def reset
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super()
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@_mCodingSM.reset()
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@_mNumOfMBChar = 0
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end
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def get_charset_name
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return "utf-8"
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end
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def feed(aBuf)
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aBuf.each_byte do |b|
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c = b.chr
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codingState = @_mCodingSM.next_state(c)
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if codingState == EError
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@_mState = ENotMe
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break
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elsif codingState == EItsMe
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@_mState = EFoundIt
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break
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elsif codingState == EStart
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if @_mCodingSM.get_current_charlen() >= 2
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@_mNumOfMBChar += 1
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end
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end
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end
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if get_state() == EDetecting
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if get_confidence() > SHORTCUT_THRESHOLD
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@_mState = EFoundIt
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end
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end
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return get_state()
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end
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def get_confidence
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unlike = 0.99
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if @_mNumOfMBChar < 6
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for i in (0...@_mNumOfMBChar)
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unlike = unlike * ONE_CHAR_PROB
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end
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return 1.0 - unlike
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else
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return unlike
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end
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end
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end
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end
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