89 lines
2.8 KiB
Ruby
Executable File
89 lines
2.8 KiB
Ruby
Executable File
######################## 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
|
|
class SJISProber < MultiByteCharSetProber
|
|
def initialize
|
|
super()
|
|
@_mCodingSM = CodingStateMachine.new(SJISSMModel)
|
|
@_mDistributionAnalyzer = SJISDistributionAnalysis.new()
|
|
@_mContextAnalyzer = SJISContextAnalysis.new()
|
|
reset()
|
|
end
|
|
|
|
def reset
|
|
super()
|
|
@_mContextAnalyzer.reset()
|
|
end
|
|
|
|
def get_charset_name
|
|
return "SHIFT_JIS"
|
|
end
|
|
|
|
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
|
|
|
|
def get_confidence
|
|
l = [@_mContextAnalyzer.get_confidence(), @_mDistributionAnalyzer.get_confidence()]
|
|
return l.max
|
|
end
|
|
end
|
|
end
|