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