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 void ME_StrDeleteV(ME_String *s, int nVChar, int nChars)
 112 {
 113   int end_ofs = nVChar + nChars;
 114
 115   assert(nChars >= 0);
 116   assert(nVChar >= 0);
 117   assert(end_ofs <= s->nLen);
 118
 119   memmove(s->szData + nVChar, s->szData + end_ofs,
 120           (s->nLen - end_ofs + 1) * sizeof(WCHAR));
 121   s->nLen -= nChars;
 122 }
 123
 124 static int
 125 ME_WordBreakProc(LPWSTR s, INT start, INT len, INT code)
 126 {
 127   /* FIXME: Native also knows about punctuation */
 128   TRACE("s==%s, start==%d, len==%d, code==%d\n",
 129         debugstr_wn(s, len), start, len, code);
 130   /* convert number of bytes to number of characters. */
 131   len /= sizeof(WCHAR);
 132   switch (code)
 133   {
 134     case WB_ISDELIMITER:
 135       return ME_IsWSpace(s[start]);
 136     case WB_LEFT:
 137     case WB_MOVEWORDLEFT:
 138       while (start && ME_IsWSpace(s[start - 1]))
 139         start--;
 140       while (start && !ME_IsWSpace(s[start - 1]))
 141         start--;
 142       return start;
 143     case WB_RIGHT:
 144     case WB_MOVEWORDRIGHT:
 145       while (start < len && !ME_IsWSpace(s[start]))
 146         start++;
 147       while (start < len && ME_IsWSpace(s[start]))
 148         start++;
 149       return start;
 150   }
 151   return 0;
 152 }
 153
 154
 155 int
 156 ME_CallWordBreakProc(ME_TextEditor *editor, WCHAR *str, INT len, INT start, INT code)
 157 {
 158   if (!editor->pfnWordBreak) {
 159     return ME_WordBreakProc(str, start, len * sizeof(WCHAR), code);
 160   } else if (!editor->bEmulateVersion10) {
 161     /* MSDN lied about the third parameter for EditWordBreakProc being the number
 162      * of characters, it is actually the number of bytes of the string. */
 163     return editor->pfnWordBreak(str, start, len * sizeof(WCHAR), code);
 164   } else {
 165     int result;
 166     int buffer_size = WideCharToMultiByte(CP_ACP, 0, str, len,
 167                                           NULL, 0, NULL, NULL);
 168     char *buffer = heap_alloc(buffer_size);
 169     WideCharToMultiByte(CP_ACP, 0, str, len,
 170                         buffer, buffer_size, NULL, NULL);
 171     result = editor->pfnWordBreak((WCHAR*)buffer, start, buffer_size, code);
 172     heap_free(buffer);
 173     return result;
 174   }
 175 }
 176
 177 LPWSTR ME_ToUnicode(BOOL unicode, LPVOID psz)
 178 {
 179   assert(psz != NULL);
 180
 181   if (unicode)
 182     return psz;
 183   else {
 184     WCHAR *tmp;
 185     int nChars = MultiByteToWideChar(CP_ACP, 0, psz, -1, NULL, 0);
 186     if((tmp = ALLOC_N_OBJ(WCHAR, nChars)) != NULL)
 187       MultiByteToWideChar(CP_ACP, 0, psz, -1, tmp, nChars);
 188     return tmp;
 189   }
 190 }
 191
 192 void ME_EndToUnicode(BOOL unicode, LPVOID psz)
 193 {
 194   if (!unicode)
 195     FREE_OBJ(psz);
 196 }