nsSingleByteCharSetProber Class Reference

#include <nsSBCharSetProber.h>

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Public Member Functions

 nsSingleByteCharSetProber (SequenceModel *model)
 nsSingleByteCharSetProber (SequenceModel *model, PRBool reversed, nsCharSetProber *nameProber)
virtual const char * GetCharSetName ()
virtual nsProbingState HandleData (const char *aBuf, PRUint32 aLen)
virtual nsProbingState GetState (void)
virtual void Reset (void)
virtual float GetConfidence (void)
virtual void SetOpion ()
PRBool KeepEnglishLetters ()

Protected Attributes

nsProbingState mState
const SequenceModel * mModel
const PRBool mReversed
unsigned char mLastOrder
PRUint32 mTotalSeqs
PRUint32 mSeqCounters [NUMBER_OF_SEQ_CAT]
PRUint32 mTotalChar
PRUint32 mFreqChar
nsCharSetProber * mNameProber

Detailed Description

Definition at line 62 of file nsSBCharSetProber.h.

Constructor & Destructor Documentation

nsSingleByteCharSetProber::nsSingleByteCharSetProber ( SequenceModel *  model  )  [inline]

Definition at line 64 of file nsSBCharSetProber.h.

References Reset().

00065     :mModel(model), mReversed(PR_FALSE), mNameProber(0) { Reset(); }

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nsSingleByteCharSetProber::nsSingleByteCharSetProber ( SequenceModel *  model,
PRBool  reversed,
nsCharSetProber *  nameProber 
) [inline]

Definition at line 66 of file nsSBCharSetProber.h.

References Reset().

00067     :mModel(model), mReversed(reversed), mNameProber(nameProber) { Reset(); }

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Member Function Documentation

const char * nsSingleByteCharSetProber::GetCharSetName (  )  [virtual]

Implements nsCharSetProber.

Definition at line 114 of file nsSBCharSetProber.cpp.

References SequenceModel::charsetName, nsCharSetProber::GetCharSetName(), mModel, and mNameProber.

00115 {
00116   if (!mNameProber)
00117     return mModel->charsetName;
00118   return mNameProber->GetCharSetName();
00119 }

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float nsSingleByteCharSetProber::GetConfidence ( void   )  [virtual]

Implements nsCharSetProber.

Definition at line 93 of file nsSBCharSetProber.cpp.

References mFreqChar, mModel, mSeqCounters, mTotalChar, mTotalSeqs, SequenceModel::mTypicalPositiveRatio, NEGATIVE_CAT, and POSITIVE_CAT.

Referenced by HandleData().

00094 {
00095 #ifdef NEGATIVE_APPROACH
00096   if (mTotalSeqs > 0)
00097     if (mTotalSeqs > mSeqCounters[NEGATIVE_CAT]*10 )
00098       return ((float)(mTotalSeqs - mSeqCounters[NEGATIVE_CAT]*10))/mTotalSeqs * mFreqChar / mTotalChar;
00099   return (float)0.01;
00100 #else  //POSITIVE_APPROACH
00101   float r;
00102 
00103   if (mTotalSeqs > 0) {
00104     r = ((float)1.0) * mSeqCounters[POSITIVE_CAT] / mTotalSeqs / mModel->mTypicalPositiveRatio;
00105     r = r*mFreqChar/mTotalChar;
00106     if (r >= (float)1.00)
00107       r = (float)0.99;
00108     return r;
00109   }
00110   return (float)0.01;
00111 #endif
00112 }

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

Implements nsCharSetProber.

Definition at line 71 of file nsSBCharSetProber.h.

References mState.

00071 {return mState;};

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

Implements nsCharSetProber.

Definition at line 41 of file nsSBCharSetProber.cpp.

References SequenceModel::charToOrderMap, eDetecting, eFoundIt, eNotMe, GetConfidence(), mFreqChar, mLastOrder, mModel, mReversed, mSeqCounters, mState, mTotalChar, mTotalSeqs, NEGATIVE_SHORTCUT_THRESHOLD, POSITIVE_SHORTCUT_THRESHOLD, SequenceModel::precedenceMatrix, SAMPLE_SIZE, SB_ENOUGH_REL_THRESHOLD, and SYMBOL_CAT_ORDER.

00042 {
00043   unsigned char order;
00044 
00045   for (PRUint32 i = 0; i < aLen; i++)
00046   {
00047     order = mModel->charToOrderMap[(unsigned char)aBuf[i]];
00048 
00049     if (order < SYMBOL_CAT_ORDER)
00050       mTotalChar++;
00051     if (order < SAMPLE_SIZE)
00052     {
00053         mFreqChar++;
00054 
00055       if (mLastOrder < SAMPLE_SIZE)
00056       {
00057         mTotalSeqs++;
00058         if (!mReversed)
00059           ++(mSeqCounters[mModel->precedenceMatrix[mLastOrder*SAMPLE_SIZE+order]]);
00060         else // reverse the order of the letters in the lookup
00061           ++(mSeqCounters[mModel->precedenceMatrix[order*SAMPLE_SIZE+mLastOrder]]);
00062       }
00063     }
00064     mLastOrder = order;
00065   }
00066 
00067   if (mState == eDetecting)
00068     if (mTotalSeqs > SB_ENOUGH_REL_THRESHOLD)
00069     {
00070       float cf = GetConfidence();
00071       if (cf > POSITIVE_SHORTCUT_THRESHOLD)
00072         mState = eFoundIt;
00073       else if (cf < NEGATIVE_SHORTCUT_THRESHOLD)
00074         mState = eNotMe;
00075     }
00076 
00077   return mState;
00078 }

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PRBool nsSingleByteCharSetProber::KeepEnglishLetters (  )  [inline]

Definition at line 82 of file nsSBCharSetProber.h.

00082 {return mModel->keepEnglishLetter;}; // (not implemented)

void nsSingleByteCharSetProber::Reset ( void   )  [virtual]

Implements nsCharSetProber.

Definition at line 80 of file nsSBCharSetProber.cpp.

References eDetecting, mFreqChar, mLastOrder, mSeqCounters, mState, mTotalChar, mTotalSeqs, and NUMBER_OF_SEQ_CAT.

Referenced by nsSingleByteCharSetProber().

00081 {
00082   mState = eDetecting;
00083   mLastOrder = 255;
00084   for (PRUint32 i = 0; i < NUMBER_OF_SEQ_CAT; i++)
00085     mSeqCounters[i] = 0;
00086   mTotalSeqs = 0;
00087   mTotalChar = 0;
00088   mFreqChar = 0;
00089 }

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virtual void nsSingleByteCharSetProber::SetOpion (  )  [inline, virtual]

Implements nsCharSetProber.

Definition at line 74 of file nsSBCharSetProber.h.

00074 {};

Field Documentation

PRUint32 nsSingleByteCharSetProber::mFreqChar [protected]

Definition at line 101 of file nsSBCharSetProber.h.

Referenced by GetConfidence(), HandleData(), and Reset().

unsigned char nsSingleByteCharSetProber::mLastOrder [protected]

Definition at line 94 of file nsSBCharSetProber.h.

Referenced by HandleData(), and Reset().

const SequenceModel* nsSingleByteCharSetProber::mModel [protected]

Definition at line 90 of file nsSBCharSetProber.h.

Referenced by GetCharSetName(), GetConfidence(), and HandleData().

nsCharSetProber* nsSingleByteCharSetProber::mNameProber [protected]

Definition at line 104 of file nsSBCharSetProber.h.

Referenced by GetCharSetName().

const PRBool nsSingleByteCharSetProber::mReversed [protected]

Definition at line 91 of file nsSBCharSetProber.h.

Referenced by HandleData().

PRUint32 nsSingleByteCharSetProber::mSeqCounters[NUMBER_OF_SEQ_CAT] [protected]

Definition at line 97 of file nsSBCharSetProber.h.

Referenced by GetConfidence(), HandleData(), and Reset().

nsProbingState nsSingleByteCharSetProber::mState [protected]

Definition at line 82 of file nsSBCharSetProber.h.

Referenced by GetState(), HandleData(), and Reset().

PRUint32 nsSingleByteCharSetProber::mTotalChar [protected]

Definition at line 99 of file nsSBCharSetProber.h.

Referenced by GetConfidence(), HandleData(), and Reset().

PRUint32 nsSingleByteCharSetProber::mTotalSeqs [protected]

Definition at line 96 of file nsSBCharSetProber.h.

Referenced by GetConfidence(), HandleData(), and Reset().

The documentation for this class was generated from the following files:
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