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Edit File: jpcntx.rb
######################## BEGIN LICENSE BLOCK ######################## # The Original Code is Mozilla Communicator client 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 NUM_OF_CATEGORY = 6 DONT_KNOW = -1 ENOUGH_REL_THRESHOLD = 100 MAX_REL_THRESHOLD = 1000 # This is hiragana 2-char sequence table, the number in each cell represents its frequency category JP2_CHAR_CONTEXT = [ [0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1].freeze, [2,4,0,4,0,3,0,4,0,3,4,4,4,2,4,3,3,4,3,2,3,3,4,2,3,3,3,2,4,1,4,3,3,1,5,4,3,4,3,4,3,5,3,0,3,5,4,2,0,3,1,0,3,3,0,3,3,0,1,1,0,4,3,0,3,3,0,4,0,2,0,3,5,5,5,5,4,0,4,1,0,3,4].freeze, 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[0,4,0,3,0,3,0,3,0,3,5,5,3,3,3,3,4,3,4,3,3,3,4,4,4,3,3,3,3,4,3,5,3,3,1,3,2,4,5,5,5,5,4,3,4,5,5,3,2,2,3,3,3,3,2,3,3,1,2,3,2,4,3,3,3,4,0,4,0,2,0,4,3,2,2,1,2,0,3,0,0,4,1].freeze, ].freeze class JapaneseContextAnalysis def initialize reset() end def reset @totalRel = 0 # total sequence received @relSample = [0] * NUM_OF_CATEGORY # category counters, each interger counts sequence in its category @needToSkipCharNum = 0 # if last byte in current buffer is not the last byte of a character, we need to know how many bytes to skip in next buffer @lastCharOrder = -1 # The order of previous char @done = false # If this flag is set to constants.True, detection is done and conclusion has been made end def feed(aBuf, aLen) return if @done # The buffer we got is byte oriented, and a character may span in more than one # buffers. In case the last one or two byte in last buffer is not complete, we # record how many byte needed to complete that character and skip these bytes here. # We can choose to record those bytes as well and analyse the character once it # is complete, but since a character will not make much difference, by simply skipping # this character will simply our logic and improve performance. i = @needToSkipCharNum while i < aLen order, charLen = get_order(aBuf[i, 2]) i += charLen if i > aLen @needToSkipCharNum = i - aLen @lastCharOrder = -1 else if (order != -1) and (@lastCharOrder != -1) @totalRel += 1 if @totalRel > MAX_REL_THRESHOLD @done = true break end @relSample[JP2_CHAR_CONTEXT[@lastCharOrder][order]] += 1 end @lastCharOrder = order end end end def got_enough_data return @totalRel > ENOUGH_REL_THRESHOLD end def get_confidence # This is just one way to calculate confidence. It works well for me. if @totalRel > MINIMUM_DATA_THRESHOLD return (@totalRel - @relSample[0]) / @totalRel else return DONT_KNOW end end def get_order(aStr) return -1, 1 end end class SJISContextAnalysis < JapaneseContextAnalysis def get_order(aStr) return -1, 1 if aStr.nil? || aStr.empty? # find out current char's byte length first = aStr[0, 1] if ((first >= "\x81") and (first <= "\x9F")) or ((first >= "\xE0") and (first <= "\xFC")) charLen = 2 else charLen = 1 end # return its order if it is hiragana if aStr.length > 1 second = aStr[1, 1] if (first == "\202") and (second >= "\x9F") and (second <= "\xF1") return aStr[1].ord - 0x9F, charLen end end return -1, charLen end end class EUCJPContextAnalysis < JapaneseContextAnalysis def get_order(aStr) return -1, 1 unless aStr # find out current char's byte length first = aStr[0, 1] if (first == "\x8E") or ((first >= "\xA1") and (first <= "\xFE")) charLen = 2 elsif first == "\x8F" charLen = 3 else charLen = 1 end # return its order if it is hiragana if aStr.length > 1 second = aStr[1, 1] if (first == "\xA4") and (second >= "\xA1") and (second <= "\xF3") return aStr[1].ord - 0xA1, charLen end end return -1, charLen end end end