LCOV - code coverage report
Current view: directory - extensions/universalchardet/src/base - nsSBCSGroupProber.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 80 0 0.0 %
Date: 2012-06-02 Functions: 7 0 0.0 %

       1                 : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Universal charset detector code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2001
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *          Shy Shalom <shooshX@gmail.com>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : #include <stdio.h>
      40                 : #include "prmem.h"
      41                 : 
      42                 : #include "nsSBCharSetProber.h"
      43                 : #include "nsSBCSGroupProber.h"
      44                 : 
      45                 : #include "nsHebrewProber.h"
      46                 : 
      47               0 : nsSBCSGroupProber::nsSBCSGroupProber()
      48                 : {
      49               0 :   mProbers[0] = new nsSingleByteCharSetProber(&Win1251Model);
      50               0 :   mProbers[1] = new nsSingleByteCharSetProber(&Koi8rModel);
      51               0 :   mProbers[2] = new nsSingleByteCharSetProber(&Latin5Model);
      52               0 :   mProbers[3] = new nsSingleByteCharSetProber(&MacCyrillicModel);
      53               0 :   mProbers[4] = new nsSingleByteCharSetProber(&Ibm866Model);
      54               0 :   mProbers[5] = new nsSingleByteCharSetProber(&Ibm855Model);
      55               0 :   mProbers[6] = new nsSingleByteCharSetProber(&Latin7Model);
      56               0 :   mProbers[7] = new nsSingleByteCharSetProber(&Win1253Model);
      57               0 :   mProbers[8] = new nsSingleByteCharSetProber(&Latin5BulgarianModel);
      58               0 :   mProbers[9] = new nsSingleByteCharSetProber(&Win1251BulgarianModel);
      59               0 :   mProbers[10] = new nsSingleByteCharSetProber(&TIS620ThaiModel);
      60                 : 
      61               0 :   nsHebrewProber *hebprober = new nsHebrewProber();
      62                 :   // Notice: Any change in these indexes - 10,11,12 must be reflected
      63                 :   // in the code below as well.
      64               0 :   mProbers[11] = hebprober;
      65               0 :   mProbers[12] = new nsSingleByteCharSetProber(&Win1255Model, false, hebprober); // Logical Hebrew
      66               0 :   mProbers[13] = new nsSingleByteCharSetProber(&Win1255Model, true, hebprober); // Visual Hebrew
      67                 :   // Tell the Hebrew prober about the logical and visual probers
      68               0 :   if (mProbers[11] && mProbers[12] && mProbers[13]) // all are not null
      69                 :   {
      70               0 :     hebprober->SetModelProbers(mProbers[12], mProbers[13]);
      71                 :   }
      72                 :   else // One or more is null. avoid any Hebrew probing, null them all
      73                 :   {
      74               0 :     for (PRUint32 i = 11; i <= 13; ++i)
      75                 :     { 
      76               0 :       delete mProbers[i]; 
      77               0 :       mProbers[i] = 0; 
      78                 :     }
      79                 :   }
      80                 : 
      81                 :   // disable latin2 before latin1 is available, otherwise all latin1 
      82                 :   // will be detected as latin2 because of their similarity.
      83                 :   //mProbers[10] = new nsSingleByteCharSetProber(&Latin2HungarianModel);
      84                 :   //mProbers[11] = new nsSingleByteCharSetProber(&Win1250HungarianModel);
      85                 : 
      86               0 :   Reset();
      87               0 : }
      88                 : 
      89               0 : nsSBCSGroupProber::~nsSBCSGroupProber()
      90                 : {
      91               0 :   for (PRUint32 i = 0; i < NUM_OF_SBCS_PROBERS; i++)
      92                 :   {
      93               0 :     delete mProbers[i];
      94                 :   }
      95               0 : }
      96                 : 
      97                 : 
      98               0 : const char* nsSBCSGroupProber::GetCharSetName()
      99                 : {
     100                 :   //if we have no answer yet
     101               0 :   if (mBestGuess == -1)
     102                 :   {
     103               0 :     GetConfidence();
     104                 :     //no charset seems positive
     105               0 :     if (mBestGuess == -1)
     106                 :       //we will use default.
     107               0 :       mBestGuess = 0;
     108                 :   }
     109               0 :   return mProbers[mBestGuess]->GetCharSetName();
     110                 : }
     111                 : 
     112               0 : void  nsSBCSGroupProber::Reset(void)
     113                 : {
     114               0 :   mActiveNum = 0;
     115               0 :   for (PRUint32 i = 0; i < NUM_OF_SBCS_PROBERS; i++)
     116                 :   {
     117               0 :     if (mProbers[i]) // not null
     118                 :     {
     119               0 :       mProbers[i]->Reset();
     120               0 :       mIsActive[i] = true;
     121               0 :       ++mActiveNum;
     122                 :     }
     123                 :     else
     124               0 :       mIsActive[i] = false;
     125                 :   }
     126               0 :   mBestGuess = -1;
     127               0 :   mState = eDetecting;
     128               0 : }
     129                 : 
     130                 : 
     131               0 : nsProbingState nsSBCSGroupProber::HandleData(const char* aBuf, PRUint32 aLen)
     132                 : {
     133                 :   nsProbingState st;
     134                 :   PRUint32 i;
     135               0 :   char *newBuf1 = 0;
     136               0 :   PRUint32 newLen1 = 0;
     137                 : 
     138                 :   //apply filter to original buffer, and we got new buffer back
     139                 :   //depend on what script it is, we will feed them the new buffer 
     140                 :   //we got after applying proper filter
     141                 :   //this is done without any consideration to KeepEnglishLetters
     142                 :   //of each prober since as of now, there are no probers here which
     143                 :   //recognize languages with English characters.
     144               0 :   if (!FilterWithoutEnglishLetters(aBuf, aLen, &newBuf1, newLen1))
     145               0 :     goto done;
     146                 :   
     147               0 :   if (newLen1 == 0)
     148               0 :     goto done; // Nothing to see here, move on.
     149                 : 
     150               0 :   for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
     151                 :   {
     152               0 :      if (!mIsActive[i])
     153               0 :        continue;
     154               0 :      st = mProbers[i]->HandleData(newBuf1, newLen1);
     155               0 :      if (st == eFoundIt)
     156                 :      {
     157               0 :        mBestGuess = i;
     158               0 :        mState = eFoundIt;
     159               0 :        break;
     160                 :      }
     161               0 :      else if (st == eNotMe)
     162                 :      {
     163               0 :        mIsActive[i] = false;
     164               0 :        mActiveNum--;
     165               0 :        if (mActiveNum <= 0)
     166                 :        {
     167               0 :          mState = eNotMe;
     168               0 :          break;
     169                 :        }
     170                 :      }
     171                 :   }
     172                 : 
     173                 : done:
     174               0 :   PR_FREEIF(newBuf1);
     175                 : 
     176               0 :   return mState;
     177                 : }
     178                 : 
     179               0 : float nsSBCSGroupProber::GetConfidence(void)
     180                 : {
     181                 :   PRUint32 i;
     182               0 :   float bestConf = 0.0, cf;
     183                 : 
     184               0 :   switch (mState)
     185                 :   {
     186                 :   case eFoundIt:
     187               0 :     return (float)0.99; //sure yes
     188                 :   case eNotMe:
     189               0 :     return (float)0.01;  //sure no
     190                 :   default:
     191               0 :     for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
     192                 :     {
     193               0 :       if (!mIsActive[i])
     194               0 :         continue;
     195               0 :       cf = mProbers[i]->GetConfidence();
     196               0 :       if (bestConf < cf)
     197                 :       {
     198               0 :         bestConf = cf;
     199               0 :         mBestGuess = i;
     200                 :       }
     201                 :     }
     202                 :   }
     203               0 :   return bestConf;
     204                 : }
     205                 : 
     206                 : #ifdef DEBUG_chardet
     207                 : void nsSBCSGroupProber::DumpStatus()
     208                 : {
     209                 :   PRUint32 i;
     210                 :   float cf;
     211                 :   
     212                 :   cf = GetConfidence();
     213                 :   printf(" SBCS Group Prober --------begin status \r\n");
     214                 :   for (i = 0; i < NUM_OF_SBCS_PROBERS; i++)
     215                 :   {
     216                 :     if (!mIsActive[i])
     217                 :       printf("  inactive: [%s] (i.e. confidence is too low).\r\n", mProbers[i]->GetCharSetName());
     218                 :     else
     219                 :       mProbers[i]->DumpStatus();
     220                 :   }
     221                 :   printf(" SBCS Group found best match [%s] confidence %f.\r\n",  
     222                 :          mProbers[mBestGuess]->GetCharSetName(), cf);
     223                 : }
     224                 : #endif

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