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