nsLatin1Prober Class Reference

#include <nsLatin1Prober.h>

Inheritance diagram for nsLatin1Prober:

Collaboration diagram for nsLatin1Prober:

Public Member Functions
	nsLatin1Prober (void)
virtual	~nsLatin1Prober (void)
nsProbingState	HandleData (const char *aBuf, PRUint32 aLen)
const char *	GetCharSetName ()
nsProbingState	GetState (void)
void	Reset (void)
float	GetConfidence (void)
void	SetOpion ()
Protected Attributes
nsProbingState	mState
char	mLastCharClass
PRUint32	mFreqCounter [FREQ_CAT_NUM]

Detailed Description

Definition at line 46 of file nsLatin1Prober.h.

Constructor & Destructor Documentation

nsLatin1Prober::nsLatin1Prober ( void ) [inline]

Definition at line 48 of file nsLatin1Prober.h.

References Reset().

00048 {Reset();};

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virtual nsLatin1Prober::~nsLatin1Prober ( void ) [inline, virtual]

Definition at line 49 of file nsLatin1Prober.h.

00049 {};

Member Function Documentation

const char* nsLatin1Prober::GetCharSetName ( ) [inline, virtual]

Implements nsCharSetProber.

Definition at line 51 of file nsLatin1Prober.h.

00051 {return "windows-1252";};

float nsLatin1Prober::GetConfidence ( void ) [virtual]

Implements nsCharSetProber.

Definition at line 147 of file nsLatin1Prober.cpp.

References eNotMe, FREQ_CAT_NUM, mFreqCounter, and mState.

00148 {
00149   if (mState == eNotMe)
00150     return 0.01f;
00151   
00152   float confidence;
00153   PRUint32 total = 0;
00154   for (PRInt32 i = 0; i < FREQ_CAT_NUM; i++)
00155     total += mFreqCounter[i];
00156 
00157   if(!total)
00158     confidence = 0.0f;
00159   else
00160   {
00161     confidence = mFreqCounter[3]*1.0f / total;
00162     confidence -= mFreqCounter[1]*20.0f/total;
00163   }
00164 
00165   if (confidence < 0.0f)
00166     confidence = 0.0f;
00167   
00168   // lower the confidence of latin1 so that other more accurate detector 
00169   // can take priority.
00170   confidence *= 0.50f;
00171 
00172   return confidence;
00173 }

nsProbingState nsLatin1Prober::GetState ( void ) [inline, virtual]

Implements nsCharSetProber.

Definition at line 52 of file nsLatin1Prober.h.

References mState.

00052 {return mState;};

nsProbingState nsLatin1Prober::HandleData	(	const char *	aBuf,
		PRUint32	aLen
	)			`[virtual]`

Implements nsCharSetProber.

Definition at line 117 of file nsLatin1Prober.cpp.

References CLASS_NUM, eNotMe, nsCharSetProber::FilterWithEnglishLetters(), Latin1_CharToClass, Latin1ClassModel, mFreqCounter, mLastCharClass, mState, and PR_FREEIF.

00118 {
00119   char *newBuf1 = 0;
00120   PRUint32 newLen1 = 0;
00121 
00122   if (!FilterWithEnglishLetters(aBuf, aLen, &newBuf1, newLen1)) {
00123     newBuf1 = (char*)aBuf;
00124     newLen1 = aLen;
00125   }
00126   
00127   unsigned char charClass;
00128   unsigned char freq;
00129   for (PRUint32 i = 0; i < newLen1; i++)
00130   {
00131     charClass = Latin1_CharToClass[(unsigned char)newBuf1[i]];
00132     freq = Latin1ClassModel[mLastCharClass*CLASS_NUM + charClass];
00133     if (freq == 0) {
00134       mState = eNotMe;
00135       break;
00136     }
00137     mFreqCounter[freq]++;
00138     mLastCharClass = charClass;
00139   }
00140 
00141   if (newBuf1 != aBuf)
00142     PR_FREEIF(newBuf1);
00143 
00144   return mState;
00145 }

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void nsLatin1Prober::Reset ( void ) [virtual]

Implements nsCharSetProber.

Definition at line 108 of file nsLatin1Prober.cpp.

References eDetecting, FREQ_CAT_NUM, mFreqCounter, mLastCharClass, mState, and OTH.

Referenced by nsLatin1Prober().

00109 {
00110   mState = eDetecting;
00111   mLastCharClass = OTH;
00112   for (int i = 0; i < FREQ_CAT_NUM; i++)
00113     mFreqCounter[i] = 0;
00114 }