reactos/dll/win32/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 void ME_DestroyString(ME_String *s)
  63 {
  64   if (!s) return;
  65   FREE_OBJ(s->szData);
  66   FREE_OBJ(s);
  67 }
  68
  69 BOOL ME_InsertString(ME_String *s, int ofs, const WCHAR *insert, int len)
  70 {
  71     DWORD new_len = s->nLen + len + 1;
  72     assert( ofs <= s->nLen );
  73
  74     if( new_len > s->nBuffer )
  75     {
  76         s->nBuffer = ME_GetOptimalBuffer( new_len );
  77         s->szData = heap_realloc( s->szData, s->nBuffer * sizeof(WCHAR) );
  78         if (!s->szData) return FALSE;
  79     }
  80
  81     memmove( s->szData + ofs + len, s->szData + ofs, (s->nLen - ofs + 1) * sizeof(WCHAR) );
  82     memcpy( s->szData + ofs, insert, len * sizeof(WCHAR) );
  83     s->nLen += len;
  84
  85     return TRUE;
  86 }
  87
  88 BOOL ME_AppendString(ME_String *s, const WCHAR *append, int len)
  89 {
  90     return ME_InsertString( s, s->nLen, append, len );
  91 }
  92
  93 ME_String *ME_VSplitString(ME_String *orig, int charidx)
  94 {
  95   ME_String *s;
  96
  97   /*if (charidx<0) charidx = 0;
  98   if (charidx>orig->nLen) charidx = orig->nLen;
  99   */
 100   assert(charidx>=0);
 101   assert(charidx<=orig->nLen);
 102
 103   s = ME_MakeStringN(orig->szData+charidx, orig->nLen-charidx);
 104   orig->nLen = charidx;
 105   orig->szData[charidx] = '\0';
 106   return s;
 107 }
 108
 109 void ME_StrDeleteV(ME_String *s, int nVChar, int nChars)
 110 {
 111   int end_ofs = nVChar + nChars;
 112
 113   assert(nChars >= 0);
 114   assert(nVChar >= 0);
 115   assert(end_ofs <= s->nLen);
 116
 117   memmove(s->szData + nVChar, s->szData + end_ofs,
 118           (s->nLen - end_ofs + 1) * sizeof(WCHAR));
 119   s->nLen -= nChars;
 120 }
 121
 122 static int
 123 ME_WordBreakProc(LPWSTR s, INT start, INT len, INT code)
 124 {
 125   /* FIXME: Native also knows about punctuation */
 126   TRACE("s==%s, start==%d, len==%d, code==%d\n",
 127         debugstr_wn(s, len), start, len, code);
 128   /* convert number of bytes to number of characters. */
 129   len /= sizeof(WCHAR);
 130   switch (code)
 131   {
 132     case WB_ISDELIMITER:
 133       return ME_IsWSpace(s[start]);
 134     case WB_LEFT:
 135     case WB_MOVEWORDLEFT:
 136       while (start && ME_IsWSpace(s[start - 1]))
 137         start--;
 138       while (start && !ME_IsWSpace(s[start - 1]))
 139         start--;
 140       return start;
 141     case WB_RIGHT:
 142     case WB_MOVEWORDRIGHT:
 143       while (start < len && !ME_IsWSpace(s[start]))
 144         start++;
 145       while (start < len && ME_IsWSpace(s[start]))
 146         start++;
 147       return start;
 148   }
 149   return 0;
 150 }
 151
 152
 153 int
 154 ME_CallWordBreakProc(ME_TextEditor *editor, WCHAR *str, INT len, INT start, INT code)
 155 {
 156   if (!editor->pfnWordBreak) {
 157     return ME_WordBreakProc(str, start, len * sizeof(WCHAR), code);
 158   } else if (!editor->bEmulateVersion10) {
 159     /* MSDN lied about the third parameter for EditWordBreakProc being the number
 160      * of characters, it is actually the number of bytes of the string. */
 161     return editor->pfnWordBreak(str, start, len * sizeof(WCHAR), code);
 162   } else {
 163     int result;
 164     int buffer_size = WideCharToMultiByte(CP_ACP, 0, str, len,
 165                                           NULL, 0, NULL, NULL);
 166     char *buffer = heap_alloc(buffer_size);
 167     WideCharToMultiByte(CP_ACP, 0, str, len,
 168                         buffer, buffer_size, NULL, NULL);
 169     result = editor->pfnWordBreak((WCHAR*)buffer, start, buffer_size, code);
 170     heap_free(buffer);
 171     return result;
 172   }
 173 }
 174
 175 LPWSTR ME_ToUnicode(BOOL unicode, LPVOID psz)
 176 {
 177   assert(psz != NULL);
 178
 179   if (unicode)
 180     return psz;
 181   else {
 182     WCHAR *tmp;
 183     int nChars = MultiByteToWideChar(CP_ACP, 0, psz, -1, NULL, 0);
 184     if((tmp = ALLOC_N_OBJ(WCHAR, nChars)) != NULL)
 185       MultiByteToWideChar(CP_ACP, 0, psz, -1, tmp, nChars);
 186     return tmp;
 187   }
 188 }
 189
 190 void ME_EndToUnicode(BOOL unicode, LPVOID psz)
 191 {
 192   if (!unicode)
 193     FREE_OBJ(psz);
 194 }