forked from mia/Aegisub
140 lines
4.5 KiB
C++
140 lines
4.5 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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#ifndef __JPCNTX_H__
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#define __JPCNTX_H__
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#define NUM_OF_CATEGORY 6
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#include "nscore.h"
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#define ENOUGH_REL_THRESHOLD 100
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#define MAX_REL_THRESHOLD 1000
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//hiragana frequency category table
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extern const PRUint8 jp2CharContext[83][83];
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class JapaneseContextAnalysis
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{
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public:
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JapaneseContextAnalysis() {Reset(PR_FALSE);}
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void HandleData(const char* aBuf, PRUint32 aLen);
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void HandleOneChar(const char* aStr, PRUint32 aCharLen)
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{
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PRInt32 order;
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//if we received enough data, stop here
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if (mTotalRel > MAX_REL_THRESHOLD) mDone = PR_TRUE;
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if (mDone) return;
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//Only 2-bytes characters are of our interest
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order = (aCharLen == 2) ? GetOrder(aStr) : -1;
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if (order != -1 && mLastCharOrder != -1)
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{
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mTotalRel++;
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//count this sequence to its category counter
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mRelSample[jp2CharContext[mLastCharOrder][order]]++;
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}
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mLastCharOrder = order;
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}
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float GetConfidence(void);
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void Reset(PRBool aIsPreferredLanguage);
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void SetOpion(){}
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PRBool GotEnoughData() {return mTotalRel > ENOUGH_REL_THRESHOLD;}
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protected:
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virtual PRInt32 GetOrder(const char* str, PRUint32 *charLen) = 0;
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virtual PRInt32 GetOrder(const char* str) = 0;
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//category counters, each integer counts sequences in its category
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PRUint32 mRelSample[NUM_OF_CATEGORY];
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//total sequence received
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PRUint32 mTotalRel;
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//Number of sequences needed to trigger detection
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PRUint32 mDataThreshold;
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//The order of previous char
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PRInt32 mLastCharOrder;
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//if last byte in current buffer is not the last byte of a character, we
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//need to know how many byte to skip in next buffer.
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PRUint32 mNeedToSkipCharNum;
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//If this flag is set to PR_TRUE, detection is done and conclusion has been made
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PRBool mDone;
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};
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class SJISContextAnalysis : public JapaneseContextAnalysis
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{
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//SJISContextAnalysis(){};
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protected:
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PRInt32 GetOrder(const char* str, PRUint32 *charLen);
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PRInt32 GetOrder(const char* str)
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{
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//We only interested in Hiragana, so first byte is '\202'
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if (*str == '\202' &&
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(unsigned char)*(str+1) >= (unsigned char)0x9f &&
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(unsigned char)*(str+1) <= (unsigned char)0xf1)
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return (unsigned char)*(str+1) - (unsigned char)0x9f;
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return -1;
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}
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};
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class EUCJPContextAnalysis : public JapaneseContextAnalysis
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{
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protected:
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PRInt32 GetOrder(const char* str, PRUint32 *charLen);
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PRInt32 GetOrder(const char* str)
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//We only interested in Hiragana, so first byte is '\244'
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{
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if (*str == '\244' &&
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(unsigned char)*(str+1) >= (unsigned char)0xa1 &&
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(unsigned char)*(str+1) <= (unsigned char)0xf3)
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return (unsigned char)*(str+1) - (unsigned char)0xa1;
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return -1;
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}
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};
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#endif /* __JPCNTX_H__ */
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