dlls/riched20/string.c

   1 /*
   2  * RichEdit - string operations
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   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
  21 #include "editor.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  24
  25 static int ME_GetOptimalBuffer(int nLen)
  26 {
  27   /* FIXME: This seems wasteful for tabs and end of lines strings,
  28    *        since they have a small fixed length. */
  29   return ((sizeof(WCHAR) * nLen) + 128) & ~63;
  30 }
  31
  32 /* Create a buffer (uninitialized string) of size nMaxChars */
  33 static ME_String *ME_MakeStringB(int nMaxChars)
  34 {
  35   ME_String *s = ALLOC_OBJ(ME_String);
  36
  37   s->nLen = nMaxChars;
  38   s->nBuffer = ME_GetOptimalBuffer(s->nLen + 1);
  39   s->szData = ALLOC_N_OBJ(WCHAR, s->nBuffer);
  40   s->szData[s->nLen] = 0;
  41   return s;
  42 }
  43
  44 ME_String *ME_MakeStringN(LPCWSTR szText, int nMaxChars)
  45 {
  46   ME_String *s = ME_MakeStringB(nMaxChars);
  47   /* Native allows NULL chars */
  48   memcpy(s->szData, szText, s->nLen * sizeof(WCHAR));
  49   return s;
  50 }
  51
  52 /* Make a string by repeating a char nMaxChars times */
  53 ME_String *ME_MakeStringR(WCHAR cRepeat, int nMaxChars)
  54 {
  55   int i;
  56   ME_String *s = ME_MakeStringB(nMaxChars);
  57   for (i = 0; i < nMaxChars; i++)
  58     s->szData[i] = cRepeat;
  59   return s;
  60 }
  61
  62 ME_String *ME_StrDup(const ME_String *s)
  63 {
  64   return ME_MakeStringN(s->szData, s->nLen);
  65 }
  66
  67 void ME_DestroyString(ME_String *s)
  68 {
  69   if (!s) return;
  70   FREE_OBJ(s->szData);
  71   FREE_OBJ(s);
  72 }
  73
  74 void ME_AppendString(ME_String *s1, const ME_String *s2)
  75 {
  76   if (s1->nLen+s2->nLen+1 <= s1->nBuffer)
  77   {
  78     memcpy(s1->szData + s1->nLen, s2->szData, s2->nLen * sizeof(WCHAR));
  79     s1->nLen += s2->nLen;
  80     s1->szData[s1->nLen] = 0;
  81   } else {
  82     WCHAR *buf;
  83     s1->nBuffer = ME_GetOptimalBuffer(s1->nLen+s2->nLen+1);
  84
  85     buf = ALLOC_N_OBJ(WCHAR, s1->nBuffer);
  86     memcpy(buf, s1->szData, s1->nLen * sizeof(WCHAR));
  87     memcpy(buf + s1->nLen, s2->szData, s2->nLen * sizeof(WCHAR));
  88     FREE_OBJ(s1->szData);
  89     s1->szData = buf;
  90     s1->nLen += s2->nLen;
  91     s1->szData[s1->nLen] = 0;
  92   }
  93 }
  94
  95 ME_String *ME_VSplitString(ME_String *orig, int charidx)
  96 {
  97   ME_String *s;
  98
  99   /*if (charidx<0) charidx = 0;
 100   if (charidx>orig->nLen) charidx = orig->nLen;
 101   */
 102   assert(charidx>=0);
 103   assert(charidx<=orig->nLen);
 104
 105   s = ME_MakeStringN(orig->szData+charidx, orig->nLen-charidx);
 106   orig->nLen = charidx;
 107   orig->szData[charidx] = '\0';
 108   return s;
 109 }
 110
 111 int ME_IsWhitespaces(const ME_String *s)
 112 {
 113   /* FIXME multibyte */
 114   WCHAR *pos = s->szData;
 115   while(ME_IsWSpace(*pos++))
 116     ;
 117   pos--;
 118   if (*pos)
 119     return 0;
 120   else
 121     return 1;
 122 }
 123
 124 int ME_IsSplitable(const ME_String *s)
 125 {
 126   WCHAR *pos = s->szData;
 127   WCHAR ch;
 128   while(ME_IsWSpace(*pos++))
 129     ;
 130   pos--;
 131   while((ch = *pos++) != 0)
 132   {
 133     if (ME_IsWSpace(ch))
 134       return 1;
 135   }
 136   return 0;
 137 }
 138
 139 void ME_StrDeleteV(ME_String *s, int nVChar, int nChars)
 140 {
 141   int end_ofs = nVChar + nChars;
 142
 143   assert(nChars >= 0);
 144   assert(nVChar >= 0);
 145   assert(end_ofs <= s->nLen);
 146
 147   memmove(s->szData + nVChar, s->szData + end_ofs,
 148           (s->nLen - end_ofs + 1) * sizeof(WCHAR));
 149   s->nLen -= nChars;
 150 }
 151
 152 int ME_FindNonWhitespaceV(const ME_String *s, int nVChar) {
 153   int i;
 154   for (i = nVChar; i<s->nLen && ME_IsWSpace(s->szData[i]); i++)
 155     ;
 156
 157   return i;
 158 }
 159
 160 /* note: returns offset of the first trailing whitespace */
 161 int ME_ReverseFindNonWhitespaceV(const ME_String *s, int nVChar) {
 162   int i;
 163   for (i = nVChar; i>0 && ME_IsWSpace(s->szData[i-1]); i--)
 164     ;
 165
 166   return i;
 167 }
 168
 169 /* note: returns offset of the first trailing nonwhitespace */
 170 int ME_ReverseFindWhitespaceV(const ME_String *s, int nVChar) {
 171   int i;
 172   for (i = nVChar; i>0 && !ME_IsWSpace(s->szData[i-1]); i--)
 173     ;
 174
 175   return i;
 176 }
 177
 178
 179 static int
 180 ME_WordBreakProc(LPWSTR s, INT start, INT len, INT code)
 181 {
 182   /* FIXME: Native also knows about punctuation */
 183   TRACE("s==%s, start==%d, len==%d, code==%d\n",
 184         debugstr_wn(s, len), start, len, code);
 185   /* convert number of bytes to number of characters. */
 186   len /= sizeof(WCHAR);
 187   switch (code)
 188   {
 189     case WB_ISDELIMITER:
 190       return ME_IsWSpace(s[start]);
 191     case WB_LEFT:
 192     case WB_MOVEWORDLEFT:
 193       while (start && ME_IsWSpace(s[start - 1]))
 194         start--;
 195       while (start && !ME_IsWSpace(s[start - 1]))
 196         start--;
 197       return start;
 198     case WB_RIGHT:
 199     case WB_MOVEWORDRIGHT:
 200       while (start < len && !ME_IsWSpace(s[start]))
 201         start++;
 202       while (start < len && ME_IsWSpace(s[start]))
 203         start++;
 204       return start;
 205   }
 206   return 0;
 207 }
 208
 209
 210 int
 211 ME_CallWordBreakProc(ME_TextEditor *editor, ME_String *str, INT start, INT code)
 212 {
 213   if (!editor->pfnWordBreak) {
 214     return ME_WordBreakProc(str->szData, start, str->nLen*sizeof(WCHAR), code);
 215   } else if (!editor->bEmulateVersion10) {
 216     /* MSDN lied about the third parameter for EditWordBreakProc being the number
 217      * of characters, it is actually the number of bytes of the string. */
 218     return editor->pfnWordBreak(str->szData, start, str->nLen*sizeof(WCHAR), code);
 219   } else {
 220     int result;
 221     int buffer_size = WideCharToMultiByte(CP_ACP, 0, str->szData, str->nLen,
 222                                           NULL, 0, NULL, NULL);
 223     char *buffer = heap_alloc(buffer_size);
 224     WideCharToMultiByte(CP_ACP, 0, str->szData, str->nLen,
 225                         buffer, buffer_size, NULL, NULL);
 226     result = editor->pfnWordBreak(str->szData, start, str->nLen, code);
 227     heap_free(buffer);
 228     return result;
 229   }
 230 }
 231
 232 LPWSTR ME_ToUnicode(BOOL unicode, LPVOID psz)
 233 {
 234   assert(psz != NULL);
 235
 236   if (unicode)
 237     return psz;
 238   else {
 239     WCHAR *tmp;
 240     int nChars = MultiByteToWideChar(CP_ACP, 0, psz, -1, NULL, 0);
 241     if((tmp = ALLOC_N_OBJ(WCHAR, nChars)) != NULL)
 242       MultiByteToWideChar(CP_ACP, 0, psz, -1, tmp, nChars);
 243     return tmp;
 244   }
 245 }
 246
 247 void ME_EndToUnicode(BOOL unicode, LPVOID psz)
 248 {
 249   if (!unicode)
 250     FREE_OBJ(psz);
 251 }