int ME_GetCharBack(const ME_String *s, int nPos)
{
int nVPos = ME_StrVLen(s);
assert(nPos < ME_StrLen(s));
if (nPos)
nVPos = ME_StrRelPos2(s, nVPos, -nPos);
if (nVPos < s->nLen)
return s->szData[nVPos];
return -1;
}
void ME_StrDeleteV(ME_String *s, int nVChar, int nChars)
{
int end_ofs;
assert(nVChar >=0 && nVChar <= s->nLen);
assert(nChars >= 0);
assert(nVChar+nChars <= s->nLen);
end_ofs = ME_StrRelPos2(s, nVChar, nChars);
assert(end_ofs <= s->nLen);
memmove(s->szData+nVChar, s->szData+end_ofs, 2*(s->nLen+1-end_ofs));
s->nLen -= (end_ofs - nVChar);
}
static BOOL
ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
{
ME_DisplayItem *pRun = pCursor->pRun;
if (nRelOfs == -1)
{
if (!pCursor->nOffset)
{
do {
pRun = ME_FindItemBack(pRun, diRunOrParagraph);
assert(pRun);
switch (pRun->type)
{
case diRun:
break;
case diParagraph:
if (pRun->member.para.prev_para->type == diTextStart)
return FALSE;
pRun = ME_FindItemBack(pRun, diRunOrParagraph);
/* every paragraph ought to have at least one run */
assert(pRun && pRun->type == diRun);
assert(pRun->member.run.nFlags & MERF_ENDPARA);
break;
default:
assert(pRun->type != diRun && pRun->type != diParagraph);
return FALSE;
}
} while (RUN_IS_HIDDEN(&pRun->member.run) ||
pRun->member.run.nFlags & MERF_HIDDEN);
pCursor->pRun = pRun;
if (pRun->member.run.nFlags & MERF_ENDPARA)
pCursor->nOffset = 0;
else
pCursor->nOffset = pRun->member.run.strText->nLen;
}
if (pCursor->nOffset)
pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
return TRUE;
}
else
{
if (!(pRun->member.run.nFlags & MERF_ENDPARA))
{
int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
if (new_ofs < pRun->member.run.strText->nLen)
{
pCursor->nOffset = new_ofs;
return TRUE;
}
}
do {
pRun = ME_FindItemFwd(pRun, diRun);
} while (pRun && (RUN_IS_HIDDEN(&pRun->member.run) ||
pRun->member.run.nFlags & MERF_HIDDEN));
if (pRun)
{
pCursor->pRun = pRun;
pCursor->nOffset = 0;
return TRUE;
}
}
return FALSE;
}
int ME_PosToVPos(const ME_String *s, int nPos)
{
if (!nPos)
return 0;
return ME_StrRelPos2(s, 0, nPos);
}