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/* -*- Mode: C; tab-width: 4; 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 Universal charset detector code. This
* file was later added by Jehan in 2021 to add language detection.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001 the
* Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jehan <zemarmot.net> (2021)
*
* 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 nsLanguageDetector_h__
#define nsLanguageDetector_h__
#include "nscore.h"
#define LANG_SB_ENOUGH_REL_THRESHOLD 2048
#define LANG_POSITIVE_SHORTCUT_THRESHOLD (float)0.95
#define LANG_NEGATIVE_SHORTCUT_THRESHOLD (float)0.05
#define LANG_NUMBER_OF_SEQ_CAT 4
#define LANG_POSITIVE_CAT 3
#define LANG_PROBABLE_CAT 2
#define LANG_NEUTRAL_CAT 1
#define LANG_NEGATIVE_CAT 0
typedef struct
{
const char* langName;
/* Table mapping codepoints to character orders. */
const PRUint32* charOrderTable;
int charOrderTableSize;
/* freqCharCount x freqCharCount table of 2-char sequence's frequencies. */
const PRUint8* const precedenceMatrix;
/* The count of frequent characters.
* precedenceMatrix size is the square of this count.
* charOrderTable can be bigger as it can contain equivalent
* characters. Yet it maps to this range of orders.
*/
int freqCharCount;
/* Most languages have 3 or 4 characters which are used more than 40% of the
* times. We count how many they are and what ratio they are used.
*/
int veryFreqCharCount;
float veryFreqRatio;
/* Most languages will have a whole range of characters which in cumulated
* total are barely used a few percents of the times. We count how many they
* are and what ratio they are used.
*/
int lowFreqOrder;
float lowFreqRatio;
} LanguageModel;
typedef enum {
STATE_DETECTING,
STATE_FOUND,
STATE_UNLIKELY
} nsDetectState;
class nsLanguageDetector {
public:
nsLanguageDetector(const LanguageModel *model) : mModel(model) { Reset(); }
virtual ~nsLanguageDetector() {}
/* Unlike nsSingleByteCharSetProber, it is charset-unaware and only
* looks at unicode codepoints.
*/
virtual const char* GetLanguage();
virtual nsDetectState HandleData(const int* codepoints, PRUint32 cpLen);
virtual void Reset(void);
virtual float GetConfidence(void);
protected:
const LanguageModel* const mModel;
nsDetectState mState;
/* Order of last character */
int mLastOrder;
PRUint32 mTotalSeqs;
PRUint32 mSeqCounters[LANG_NUMBER_OF_SEQ_CAT];
PRUint32 mTotalChar;
/*PRUint32 mCtrlChar;*/
/*PRUint32 mEmoticons;*/
/*PRUint32 mVariousBetween;*/
/* Characters that fall in our sampling range */
PRUint32 mFreqChar;
/* Most common characters from our sampling range */
PRUint32 mVeryFreqChar;
/* Most rare characters from our sampling range */
PRUint32 mLowFreqChar;
PRUint32 mOutChar;
private:
int GetOrderFromCodePoint(int codePoint);
};
extern const LanguageModel ArabicModel;
extern const LanguageModel BelarusianModel;
extern const LanguageModel BulgarianModel;
extern const LanguageModel CroatianModel;
extern const LanguageModel CzechModel;
extern const LanguageModel DanishModel;
extern const LanguageModel EnglishModel;
extern const LanguageModel EsperantoModel;
extern const LanguageModel EstonianModel;
extern const LanguageModel FinnishModel;
extern const LanguageModel FrenchModel;
extern const LanguageModel GermanModel;
extern const LanguageModel GreekModel;
extern const LanguageModel HebrewModel;
extern const LanguageModel HindiModel;
extern const LanguageModel HungarianModel;
extern const LanguageModel IrishModel;
extern const LanguageModel ItalianModel;
extern const LanguageModel LatvianModel;
extern const LanguageModel LithuanianModel;
extern const LanguageModel MalteseModel;
extern const LanguageModel NorwegianModel;
extern const LanguageModel PolishModel;
extern const LanguageModel PortugueseModel;
extern const LanguageModel RomanianModel;
extern const LanguageModel SlovakModel;
extern const LanguageModel SloveneModel;
extern const LanguageModel SpanishModel;
extern const LanguageModel SwedishModel;
extern const LanguageModel ThaiModel;
extern const LanguageModel TurkishModel;
extern const LanguageModel UkrainianModel;
extern const LanguageModel VietnameseModel;
#endif /* nsLanguageDetector_h__ */
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