Aegisub/aegisub/universalchardet/CharDistribution.cpp

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