libs/port/sortkey.c

   1 /*
   2  * Unicode sort key generation
   3  *
   4  * Copyright 2003 Dmitry Timoshkov
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20 #include "wine/unicode.h"
  21
  22 extern unsigned int wine_decompose( int flags, WCHAR ch, WCHAR *dst, unsigned int dstlen );
  23 extern const unsigned int collation_table[];
  24
  25 /*
  26  * flags - normalization NORM_* flags
  27  *
  28  * FIXME: 'variable' flag not handled
  29  */
  30 int wine_get_sortkey(int flags, const WCHAR *src, int srclen, char *dst, int dstlen)
  31 {
  32     WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
  33     int key_len[4];
  34     char *key_ptr[4];
  35     const WCHAR *src_save = src;
  36     int srclen_save = srclen;
  37
  38     key_len[0] = key_len[1] = key_len[2] = key_len[3] = 0;
  39     for (; srclen; srclen--, src++)
  40     {
  41         unsigned int i, decomposed_len = 1;/*wine_decompose(*src, dummy, 4);*/
  42         dummy[0] = *src;
  43         if (decomposed_len)
  44         {
  45             for (i = 0; i < decomposed_len; i++)
  46             {
  47                 WCHAR wch = dummy[i];
  48                 unsigned int ce;
  49
  50                 /* tests show that win2k just ignores NORM_IGNORENONSPACE,
  51                  * and skips white space and punctuation characters for
  52                  * NORM_IGNORESYMBOLS.
  53                  */
  54                 if ((flags & NORM_IGNORESYMBOLS) && (get_char_typeW(wch) & (C1_PUNCT | C1_SPACE)))
  55                     continue;
  56
  57                 if (flags & NORM_IGNORECASE) wch = tolowerW(wch);
  58
  59                 ce = collation_table[collation_table[wch >> 8] + (wch & 0xff)];
  60                 if (ce != (unsigned int)-1)
  61                 {
  62                     if (ce >> 16) key_len[0] += 2;
  63                     if ((ce >> 8) & 0xff) key_len[1]++;
  64                     if ((ce >> 4) & 0x0f) key_len[2]++;
  65                     if (ce & 1)
  66                     {
  67                         if (wch >> 8) key_len[3]++;
  68                         key_len[3]++;
  69                     }
  70                 }
  71                 else
  72                 {
  73                     key_len[0] += 2;
  74                     if (wch >> 8) key_len[0]++;
  75                     if (wch & 0xff) key_len[0]++;
  76                 }
  77             }
  78         }
  79     }
  80
  81     if (!dstlen) /* compute length */
  82         /* 4 * '\1' + key length */
  83         return key_len[0] + key_len[1] + key_len[2] + key_len[3] + 4;
  84
  85     if (dstlen < key_len[0] + key_len[1] + key_len[2] + key_len[3] + 4 + 1)
  86         return 0; /* overflow */
  87
  88     src = src_save;
  89     srclen = srclen_save;
  90
  91     key_ptr[0] = dst;
  92     key_ptr[1] = key_ptr[0] + key_len[0] + 1;
  93     key_ptr[2] = key_ptr[1] + key_len[1] + 1;
  94     key_ptr[3] = key_ptr[2] + key_len[2] + 1;
  95
  96     for (; srclen; srclen--, src++)
  97     {
  98         unsigned int i, decomposed_len = 1;/*wine_decompose(*src, dummy, 4);*/
  99         dummy[0] = *src;
 100         if (decomposed_len)
 101         {
 102             for (i = 0; i < decomposed_len; i++)
 103             {
 104                 WCHAR wch = dummy[i];
 105                 unsigned int ce;
 106
 107                 /* tests show that win2k just ignores NORM_IGNORENONSPACE,
 108                  * and skips white space and punctuation characters for
 109                  * NORM_IGNORESYMBOLS.
 110                  */
 111                 if ((flags & NORM_IGNORESYMBOLS) && (get_char_typeW(wch) & (C1_PUNCT | C1_SPACE)))
 112                     continue;
 113
 114                 if (flags & NORM_IGNORECASE) wch = tolowerW(wch);
 115
 116                 ce = collation_table[collation_table[wch >> 8] + (wch & 0xff)];
 117                 if (ce != (unsigned int)-1)
 118                 {
 119                     WCHAR key;
 120                     if ((key = ce >> 16))
 121                     {
 122                         *key_ptr[0]++ = key >> 8;
 123                         *key_ptr[0]++ = key & 0xff;
 124                     }
 125                     /* make key 1 start from 2 */
 126                     if ((key = (ce >> 8) & 0xff)) *key_ptr[1]++ = key + 1;
 127                     /* make key 2 start from 2 */
 128                     if ((key = (ce >> 4) & 0x0f)) *key_ptr[2]++ = key + 1;
 129                     /* key 3 is always a character code */
 130                     if (ce & 1)
 131                     {
 132                         if (wch >> 8) *key_ptr[3]++ = wch >> 8;
 133                         if (wch & 0xff) *key_ptr[3]++ = wch & 0xff;
 134                     }
 135                 }
 136                 else
 137                 {
 138                     *key_ptr[0]++ = 0xff;
 139                     *key_ptr[0]++ = 0xfe;
 140                     if (wch >> 8) *key_ptr[0]++ = wch >> 8;
 141                     if (wch & 0xff) *key_ptr[0]++ = wch & 0xff;
 142                 }
 143             }
 144         }
 145     }
 146
 147     *key_ptr[0] = '\1';
 148     *key_ptr[1] = '\1';
 149     *key_ptr[2] = '\1';
 150     *key_ptr[3]++ = '\1';
 151     *key_ptr[3] = 0;
 152
 153     return key_ptr[3] - dst;
 154 }
 155
 156 enum weight
 157 {
 158     UNICODE_WEIGHT,
 159     DIACRITIC_WEIGHT,
 160     CASE_WEIGHT
 161 };
 162
 163 static unsigned int get_weight(WCHAR ch, enum weight type)
 164 {
 165     unsigned int ret;
 166
 167     ret = collation_table[collation_table[ch >> 8] + (ch & 0xff)];
 168     if (ret == (unsigned int)-1)
 169         return ch;
 170
 171     switch(type)
 172     {
 173     case UNICODE_WEIGHT:
 174         return ret >> 16;
 175     case DIACRITIC_WEIGHT:
 176         return (ret >> 8) & 0xff;
 177     case CASE_WEIGHT:
 178     default:
 179         return (ret >> 4) & 0x0f;
 180     }
 181 }
 182
 183 static void inc_str_pos(const WCHAR **str, int *len, int *dpos, int *dlen)
 184 {
 185     (*dpos)++;
 186     if (*dpos == *dlen)
 187     {
 188         *dpos = *dlen = 0;
 189         (*str)++;
 190         (*len)--;
 191     }
 192 }
 193
 194 static inline int compare_weights(int flags, const WCHAR *str1, int len1,
 195                                   const WCHAR *str2, int len2, enum weight type)
 196 {
 197     int dpos1 = 0, dpos2 = 0, dlen1 = 0, dlen2 = 0;
 198     WCHAR dstr1[4], dstr2[4];
 199     unsigned int ce1, ce2;
 200
 201     /* 32-bit collation element table format:
 202      * unicode weight - high 16 bit, diacritic weight - high 8 bit of low 16 bit,
 203      * case weight - high 4 bit of low 8 bit.
 204      */
 205     while (len1 > 0 && len2 > 0)
 206     {
 207         if (!dlen1) dlen1 = wine_decompose(0, *str1, dstr1, 4);
 208         if (!dlen2) dlen2 = wine_decompose(0, *str2, dstr2, 4);
 209
 210         if (flags & NORM_IGNORESYMBOLS)
 211         {
 212             int skip = 0;
 213             /* FIXME: not tested */
 214             if (get_char_typeW(dstr1[dpos1]) & (C1_PUNCT | C1_SPACE))
 215             {
 216                 inc_str_pos(&str1, &len1, &dpos1, &dlen1);
 217                 skip = 1;
 218             }
 219             if (get_char_typeW(dstr2[dpos2]) & (C1_PUNCT | C1_SPACE))
 220             {
 221                 inc_str_pos(&str2, &len2, &dpos2, &dlen2);
 222                 skip = 1;
 223             }
 224             if (skip) continue;
 225         }
 226
 227        /* hyphen and apostrophe are treated differently depending on
 228         * whether SORT_STRINGSORT specified or not
 229         */
 230         if (type == UNICODE_WEIGHT && !(flags & SORT_STRINGSORT))
 231         {
 232             if (dstr1[dpos1] == '-' || dstr1[dpos1] == '\'')
 233             {
 234                 if (dstr2[dpos2] != '-' && dstr2[dpos2] != '\'')
 235                 {
 236                     inc_str_pos(&str1, &len1, &dpos1, &dlen1);
 237                     continue;
 238                 }
 239             }
 240             else if (dstr2[dpos2] == '-' || dstr2[dpos2] == '\'')
 241             {
 242                 inc_str_pos(&str2, &len2, &dpos2, &dlen2);
 243                 continue;
 244             }
 245         }
 246
 247         ce1 = get_weight(dstr1[dpos1], type);
 248         if (!ce1)
 249         {
 250             inc_str_pos(&str1, &len1, &dpos1, &dlen1);
 251             continue;
 252         }
 253         ce2 = get_weight(dstr2[dpos2], type);
 254         if (!ce2)
 255         {
 256             inc_str_pos(&str2, &len2, &dpos2, &dlen2);
 257             continue;
 258         }
 259
 260         if (ce1 - ce2) return ce1 - ce2;
 261
 262         inc_str_pos(&str1, &len1, &dpos1, &dlen1);
 263         inc_str_pos(&str2, &len2, &dpos2, &dlen2);
 264     }
 265     while (len1)
 266     {
 267         if (!dlen1) dlen1 = wine_decompose(0, *str1, dstr1, 4);
 268
 269         ce1 = get_weight(dstr1[dpos1], type);
 270         if (ce1) break;
 271         inc_str_pos(&str1, &len1, &dpos1, &dlen1);
 272     }
 273     while (len2)
 274     {
 275         if (!dlen2) dlen2 = wine_decompose(0, *str2, dstr2, 4);
 276
 277         ce2 = get_weight(dstr2[dpos2], type);
 278         if (ce2) break;
 279         inc_str_pos(&str2, &len2, &dpos2, &dlen2);
 280     }
 281     return len1 - len2;
 282 }
 283
 284 int wine_compare_string(int flags, const WCHAR *str1, int len1,
 285                         const WCHAR *str2, int len2)
 286 {
 287     int ret;
 288
 289     ret = compare_weights(flags, str1, len1, str2, len2, UNICODE_WEIGHT);
 290     if (!ret)
 291     {
 292         if (!(flags & NORM_IGNORENONSPACE))
 293             ret = compare_weights(flags, str1, len1, str2, len2, DIACRITIC_WEIGHT);
 294         if (!ret && !(flags & NORM_IGNORECASE))
 295             ret = compare_weights(flags, str1, len1, str2, len2, CASE_WEIGHT);
 296     }
 297     return ret;
 298 }