forked from mia/Aegisub
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client 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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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "CharDistribution.h"
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#include "JISFreq.tab"
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#include "Big5Freq.tab"
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#include "EUCKRFreq.tab"
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#include "EUCTWFreq.tab"
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#include "GB2312Freq.tab"
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#define SURE_YES 0.99f
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#define SURE_NO 0.01f
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#define MINIMUM_DATA_THRESHOLD 4
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//return confidence base on received data
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float CharDistributionAnalysis::GetConfidence(PRBool aIsPreferredLanguage)
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{
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//if we didn't receive any character in our consideration range, or the
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// number of frequent characters is below the minimum threshold, return
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// negative answer
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if (mTotalChars <= 0 ||
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!aIsPreferredLanguage && mFreqChars <= MINIMUM_DATA_THRESHOLD)
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return SURE_NO;
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if (mTotalChars != mFreqChars) {
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float r = mFreqChars / ((mTotalChars - mFreqChars) * mTypicalDistributionRatio);
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if (r < SURE_YES)
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return r;
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}
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//normalize confidence, (we don't want to be 100% sure)
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return SURE_YES;
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}
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EUCTWDistributionAnalysis::EUCTWDistributionAnalysis()
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{
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mCharToFreqOrder = EUCTWCharToFreqOrder;
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mTableSize = EUCTW_TABLE_SIZE;
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mTypicalDistributionRatio = EUCTW_TYPICAL_DISTRIBUTION_RATIO;
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}
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EUCKRDistributionAnalysis::EUCKRDistributionAnalysis()
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{
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mCharToFreqOrder = EUCKRCharToFreqOrder;
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mTableSize = EUCKR_TABLE_SIZE;
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mTypicalDistributionRatio = EUCKR_TYPICAL_DISTRIBUTION_RATIO;
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}
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GB2312DistributionAnalysis::GB2312DistributionAnalysis()
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{
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mCharToFreqOrder = GB2312CharToFreqOrder;
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mTableSize = GB2312_TABLE_SIZE;
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mTypicalDistributionRatio = GB2312_TYPICAL_DISTRIBUTION_RATIO;
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}
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Big5DistributionAnalysis::Big5DistributionAnalysis()
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{
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mCharToFreqOrder = Big5CharToFreqOrder;
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mTableSize = BIG5_TABLE_SIZE;
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mTypicalDistributionRatio = BIG5_TYPICAL_DISTRIBUTION_RATIO;
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}
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SJISDistributionAnalysis::SJISDistributionAnalysis()
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{
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mCharToFreqOrder = JISCharToFreqOrder;
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mTableSize = JIS_TABLE_SIZE;
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mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
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}
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EUCJPDistributionAnalysis::EUCJPDistributionAnalysis()
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{
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mCharToFreqOrder = JISCharToFreqOrder;
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mTableSize = JIS_TABLE_SIZE;
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mTypicalDistributionRatio = JIS_TYPICAL_DISTRIBUTION_RATIO;
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}
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