LCOV - code coverage report
Current view: directory - objdir/toolkit/library - nsBidiUtils.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 39 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  *
       3                 :  * ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is mozilla.org code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * IBM Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2000
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *   Maha Abou El Rous <mahar@eg.ibm.com>
      25                 :  *   Lina Kemmel <lkemmel@il.ibm.com>
      26                 :  *   Simon Montagu <smontagu@netscape.com>
      27                 :  *   Roozbeh Pournader <roozbeh@sharif.edu>
      28                 :  *   Ehsan Akhgari <ehsan.akhgari@gmail.com>
      29                 :  *
      30                 :  * Alternatively, the contents of this file may be used under the terms of
      31                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      32                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      33                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      34                 :  * of those above. If you wish to allow use of your version of this file only
      35                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      36                 :  * use your version of this file under the terms of the MPL, indicate your
      37                 :  * decision by deleting the provisions above and replace them with the notice
      38                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      39                 :  * the provisions above, a recipient may use your version of this file under
      40                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      41                 :  *
      42                 :  * ***** END LICENSE BLOCK ***** */
      43                 : #include "nsBidiUtils.h"
      44                 : #include "bidicattable.h"
      45                 : #include "nsCharTraits.h"
      46                 : 
      47                 : static nsCharType ebc2ucd[15] = {
      48                 :   eCharType_OtherNeutral, /* Placeholder -- there will never be a 0 index value */
      49                 :   eCharType_LeftToRight,
      50                 :   eCharType_RightToLeft,
      51                 :   eCharType_RightToLeftArabic,
      52                 :   eCharType_ArabicNumber,
      53                 :   eCharType_EuropeanNumber,
      54                 :   eCharType_EuropeanNumberSeparator,
      55                 :   eCharType_EuropeanNumberTerminator,
      56                 :   eCharType_CommonNumberSeparator,
      57                 :   eCharType_OtherNeutral,
      58                 :   eCharType_DirNonSpacingMark,
      59                 :   eCharType_BoundaryNeutral,
      60                 :   eCharType_BlockSeparator,
      61                 :   eCharType_SegmentSeparator,
      62                 :   eCharType_WhiteSpaceNeutral
      63                 : };
      64                 : 
      65                 : static nsCharType cc2ucd[5] = {
      66                 :   eCharType_LeftToRightEmbedding,
      67                 :   eCharType_RightToLeftEmbedding,
      68                 :   eCharType_PopDirectionalFormat,
      69                 :   eCharType_LeftToRightOverride,
      70                 :   eCharType_RightToLeftOverride
      71                 : };
      72                 : 
      73                 : #define ARABIC_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_ARABIC_DIGITS)
      74                 : #define PERSIAN_TO_HINDI_DIGIT_INCREMENT (START_HINDI_DIGITS - START_FARSI_DIGITS)
      75                 : #define ARABIC_TO_PERSIAN_DIGIT_INCREMENT (START_FARSI_DIGITS - START_ARABIC_DIGITS)
      76                 : #define NUM_TO_ARABIC(c) \
      77                 :   ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
      78                 :    ((c) - (PRUint16)ARABIC_TO_HINDI_DIGIT_INCREMENT) : \
      79                 :    ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
      80                 :     ((c) - (PRUint16)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
      81                 :      (c)))
      82                 : #define NUM_TO_HINDI(c) \
      83                 :   ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
      84                 :    ((c) + (PRUint16)ARABIC_TO_HINDI_DIGIT_INCREMENT): \
      85                 :    ((((c)>=START_FARSI_DIGITS) && ((c)<=END_FARSI_DIGITS)) ? \
      86                 :     ((c) + (PRUint16)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
      87                 :      (c)))
      88                 : #define NUM_TO_PERSIAN(c) \
      89                 :   ((((c)>=START_HINDI_DIGITS) && ((c)<=END_HINDI_DIGITS)) ? \
      90                 :    ((c) - (PRUint16)PERSIAN_TO_HINDI_DIGIT_INCREMENT) : \
      91                 :    ((((c)>=START_ARABIC_DIGITS) && ((c)<=END_ARABIC_DIGITS)) ? \
      92                 :     ((c) + (PRUint16)ARABIC_TO_PERSIAN_DIGIT_INCREMENT) : \
      93                 :      (c)))
      94                 : 
      95               0 : PRUnichar HandleNumberInChar(PRUnichar aChar, bool aPrevCharArabic, PRUint32 aNumFlag)
      96                 : {
      97                 :   // IBMBIDI_NUMERAL_NOMINAL *
      98                 :   // IBMBIDI_NUMERAL_REGULAR
      99                 :   // IBMBIDI_NUMERAL_HINDICONTEXT
     100                 :   // IBMBIDI_NUMERAL_ARABIC
     101                 :   // IBMBIDI_NUMERAL_HINDI
     102                 : 
     103               0 :   switch (aNumFlag) {
     104                 :     case IBMBIDI_NUMERAL_HINDI:
     105               0 :       return NUM_TO_HINDI(aChar);
     106                 :     case IBMBIDI_NUMERAL_ARABIC:
     107               0 :       return NUM_TO_ARABIC(aChar);
     108                 :     case IBMBIDI_NUMERAL_PERSIAN:
     109               0 :       return NUM_TO_PERSIAN(aChar);
     110                 :     case IBMBIDI_NUMERAL_REGULAR:
     111                 :     case IBMBIDI_NUMERAL_HINDICONTEXT:
     112                 :     case IBMBIDI_NUMERAL_PERSIANCONTEXT:
     113                 :       // for clipboard handling
     114                 :       //XXX do we really want to convert numerals when copying text?
     115               0 :       if (aPrevCharArabic) {
     116               0 :         if (aNumFlag == IBMBIDI_NUMERAL_PERSIANCONTEXT)
     117               0 :           return NUM_TO_PERSIAN(aChar);
     118                 :         else
     119               0 :           return NUM_TO_HINDI(aChar);
     120                 :       }
     121                 :       else
     122               0 :         return NUM_TO_ARABIC(aChar);
     123                 :     case IBMBIDI_NUMERAL_NOMINAL:
     124                 :     default:
     125               0 :       return aChar;
     126                 :   }
     127                 : }
     128                 : 
     129               0 : nsresult HandleNumbers(PRUnichar* aBuffer, PRUint32 aSize, PRUint32 aNumFlag)
     130                 : {
     131                 :   PRUint32 i;
     132                 : 
     133               0 :   switch (aNumFlag) {
     134                 :     case IBMBIDI_NUMERAL_HINDI:
     135                 :     case IBMBIDI_NUMERAL_ARABIC:
     136                 :     case IBMBIDI_NUMERAL_PERSIAN:
     137                 :     case IBMBIDI_NUMERAL_REGULAR:
     138                 :     case IBMBIDI_NUMERAL_HINDICONTEXT:
     139                 :     case IBMBIDI_NUMERAL_PERSIANCONTEXT:
     140               0 :       for (i=0;i<aSize;i++)
     141               0 :         aBuffer[i] = HandleNumberInChar(aBuffer[i], !!(i>0 ? aBuffer[i-1] : 0), aNumFlag);
     142               0 :       break;
     143                 :     case IBMBIDI_NUMERAL_NOMINAL:
     144                 :     default:
     145               0 :       break;
     146                 :   }
     147               0 :   return NS_OK;
     148                 : }
     149                 : 
     150                 : #define LRM_CHAR 0x200e
     151               0 : bool IsBidiControl(PRUint32 aChar)
     152                 : {
     153                 :   // This method is used when stripping Bidi control characters for
     154                 :   // display, so it will return TRUE for LRM and RLM as
     155                 :   // well as the characters with category eBidiCat_CC
     156               0 :   return (eBidiCat_CC == GetBidiCat(aChar) || ((aChar)&0xfffffe)==LRM_CHAR);
     157                 : }
     158                 : 
     159               0 : bool HasRTLChars(const nsAString& aString)
     160                 : {
     161                 : // This is used to determine whether to enable bidi if a string has 
     162                 : // right-to-left characters. To simplify things, anything that could be a
     163                 : // surrogate or RTL presentation form is covered just by testing >= 0xD800).
     164                 : // It's fine to enable bidi in rare cases where it actually isn't needed.
     165               0 :   PRInt32 length = aString.Length();
     166               0 :   for (PRInt32 i = 0; i < length; i++) {
     167               0 :     PRUnichar ch = aString.CharAt(i);
     168               0 :     if (ch >= 0xD800 || IS_IN_BMP_RTL_BLOCK(ch)) {
     169               0 :       return true;
     170                 :     }
     171                 :   }
     172               0 :   return false;
     173                 : }
     174                 : 
     175               0 : nsCharType GetCharType(PRUint32 aChar)
     176                 : {
     177                 :   nsCharType oResult;
     178               0 :   eBidiCategory bCat = GetBidiCat(aChar);
     179               0 :   if (eBidiCat_CC != bCat) {
     180               0 :     NS_ASSERTION((PRUint32) bCat < (sizeof(ebc2ucd)/sizeof(nsCharType)), "size mismatch");
     181               0 :     if((PRUint32) bCat < (sizeof(ebc2ucd)/sizeof(nsCharType)))
     182               0 :       oResult = ebc2ucd[bCat];
     183                 :     else 
     184               0 :       oResult = ebc2ucd[0]; // something is very wrong, but we need to return a value
     185                 :   } else {
     186               0 :     NS_ASSERTION((aChar-0x202a) < (sizeof(cc2ucd)/sizeof(nsCharType)), "size mismatch");
     187               0 :     if((aChar-0x202a) < (sizeof(cc2ucd)/sizeof(nsCharType)))
     188               0 :       oResult = cc2ucd[aChar - 0x202a];
     189                 :     else 
     190               0 :       oResult = ebc2ucd[0]; // something is very wrong, but we need to return a value
     191                 :   }
     192               0 :   return oResult;
     193                 : }

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