intl/unicharutil/src/nsHankakuToZenkaku.cpp

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  37
  38 #include "nsITextTransform.h"
  39 #include "pratom.h"
  40 #include "nsUUDll.h"
  41 #include "nsTextTransformFactory.h"
  42
  43 // Basic mapping from Hankaku to Zenkaku
  44 // Nigori and Maru is take care out side this basic mapping
  45 static const PRUnichar gBasicMapping[0x40] =
  46 {
  47 // 0xff60
  48 0xff60,0x3002,0x300c,0x300d,0x3001,0x30fb,0x30f2,0x30a1,
  49 // 0xff68
  50 0x30a3,0x30a5,0x30a7,0x30a9,0x30e3,0x30e5,0x30e7,0x30c3,
  51 // 0xff70
  52 0x30fc,0x30a2,0x30a4,0x30a6,0x30a8,0x30aa,0x30ab,0x30ad,
  53 // 0xff78
  54 0x30af,0x30b1,0x30b3,0x30b5,0x30b7,0x30b9,0x30bb,0x30bd,
  55 // 0xff80
  56 0x30bf,0x30c1,0x30c4,0x30c6,0x30c8,0x30ca,0x30cb,0x30cc,
  57 // 0xff88
  58 0x30cd,0x30ce,0x30cf,0x30d2,0x30d5,0x30d8,0x30db,0x30de,
  59 // 0xff90
  60 0x30df,0x30e0,0x30e1,0x30e2,0x30e4,0x30e6,0x30e8,0x30e9,
  61 // 0xff98
  62 0x30ea,0x30eb,0x30ec,0x30ed,0x30ef,0x30f3,0x309b,0x309c
  63 };
  64
  65 // Do we need to check for Nigori for the next unicode ?
  66 #define NEED_TO_CHECK_NIGORI(u) (((0xff76<=(u))&&((u)<=0xff84))||((0xff8a<=(u))&&((u)<=0xff8e)))
  67
  68 // Do we need to check for Maru for the next unicode ?
  69 #define NEED_TO_CHECK_MARU(u) ((0xff8a<=(u))&&((u)<=0xff8e))
  70
  71 // The  unicode is in Katakana Hankaku block
  72 #define IS_HANKAKU(u) (0xff60==((u) & 0xffe0)) || (0xff80==((u)&0xffe0))
  73 #define IS_NIGORI(u) (0xff9e == (u))
  74 #define IS_MARU(u)   (0xff9f == (u))
  75 #define NIGORI_MODIFIER 1
  76 #define MARU_MODIFIER   2
  77
  78 // function prototype
  79 void HankakuToZenkaku (
  80     const PRUnichar* aSrc, PRInt32 aLen,
  81     PRUnichar* aDest, PRInt32 aDestLen, PRInt32* oLen);
  82
  83 void HankakuToZenkaku (
  84     const PRUnichar* aSrc, PRInt32 aLen,
  85     PRUnichar* aDest, PRInt32 aDestLen, PRInt32* oLen)
  86 {
  87     // XXX aDestLen is never checked, assumed to be as long as aLen
  88     NS_ASSERTION(aDestLen >= aLen, "aDest must be as long as aSrc");
  89
  90     PRInt32 i,j;
  91     if ( aLen == 0) {
  92       *oLen = 0;
  93       return;
  94     }
  95     // loop from the first to the last char except the last one.
  96     for(i = j = 0; i < (aLen-1); i++,j++,aSrc++, aDest++)
  97     {
  98        if(IS_HANKAKU(*aSrc)) {
  99          // if it is in hankaku - do basic mapping first
 100          *aDest = gBasicMapping[(*aSrc) - 0xff60];
 101
 102          // if is some char could be modifier, and the next char
 103          // is a modifier, modify it and eat one byte
 104
 105          if(IS_NIGORI(*(aSrc+1)) && NEED_TO_CHECK_NIGORI(*aSrc))
 106          {
 107             *aDest += NIGORI_MODIFIER;
 108             i++; aSrc++;
 109          }
 110          else if(IS_MARU(*(aSrc+1)) && NEED_TO_CHECK_MARU(*aSrc))
 111          {
 112             *aDest += MARU_MODIFIER;
 113             i++; aSrc++;
 114          }
 115        }
 116        else
 117        {
 118          // not in hankaku block, just copy
 119          *aDest = *aSrc;
 120        }
 121     }
 122
 123     // handle the last character
 124     if(IS_HANKAKU(*aSrc))
 125          *aDest = gBasicMapping[(*aSrc) - 0xff60];
 126     else
 127          *aDest = *aSrc;
 128
 129     *oLen = j+1;
 130 }
 131
 132
 133
 134 class nsHankakuToZenkaku : public nsITextTransform {
 135   NS_DECL_ISUPPORTS
 136
 137 public:
 138
 139   nsHankakuToZenkaku() ;
 140   virtual ~nsHankakuToZenkaku() ;
 141   NS_IMETHOD Change( const PRUnichar* aText, PRInt32 aTextLength, nsString& aResult);
 142   NS_IMETHOD Change( nsString& aText, nsString& aResult);
 143
 144 };
 145
 146 NS_IMPL_ISUPPORTS1(nsHankakuToZenkaku, nsITextTransform)
 147
 148 nsHankakuToZenkaku::nsHankakuToZenkaku()
 149 {
 150 }
 151 nsHankakuToZenkaku::~nsHankakuToZenkaku()
 152 {
 153 }
 154
 155 NS_IMETHODIMP nsHankakuToZenkaku::Change( const PRUnichar* aText, PRInt32 aTextLength, nsString& aResult)
 156 {
 157   PRInt32 ol;
 158   if (!EnsureStringLength(aResult, aTextLength))
 159     return NS_ERROR_OUT_OF_MEMORY;
 160
 161   HankakuToZenkaku ( aText, aTextLength, aResult.BeginWriting(), aTextLength, &ol);
 162   aResult.SetLength(ol);
 163
 164   return NS_OK;
 165 }
 166
 167 NS_IMETHODIMP nsHankakuToZenkaku::Change( nsString& aText, nsString& aResult)
 168 {
 169    aResult = aText;
 170    const PRUnichar* u = aResult.get();
 171    PRUnichar* ou = (PRUnichar*) u;
 172    PRInt32 l = aResult.Length();
 173    PRInt32 ol;
 174
 175    HankakuToZenkaku ( u, l, ou, l, &ol);
 176    aResult.SetLength(ol);
 177
 178    return NS_OK;
 179 }
 180
 181 nsresult NS_NewHankakuToZenkaku(nsISupports** oResult)
 182 {
 183   if(!oResult)
 184     return NS_ERROR_NULL_POINTER;
 185   *oResult = new nsHankakuToZenkaku();
 186   if(*oResult)
 187      NS_ADDREF(*oResult);
 188   return (*oResult) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
 189 }