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/***************************************************************************
** xMultiLineBuf.cpp $Revision: 1.2 $ - $Name: V2-18 $
** Class for manipulating Multiple lines of text
**
** Copyright (C) 1996 Joseph Croft <jcroft@unicomp.net>
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Library General Public
** License as published by the Free Software Foundation; either
** version 2 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Library General Public License for more details.
**
** You should have received a copy of the GNU Library General Public
** License along with this library; if not, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
***************************************************************************/
#include <stdio.h>
#include "xMultiLineBuf.h"
static int dbg = 0;
xMultiLineBuf::xMultiLineBuf(int height)
{
pBeg = new QString[height];
pEnd = pBeg + height - 1;
pHead = pTail = pBeg;
}
xMultiLineBuf::~xMultiLineBuf()
{
if (pBeg)
delete [] pBeg;
}
const QString *xMultiLineBuf::nextLine(QString *pStr, bool used)
{
if (used && pHead == pTail)
return(pHead);
else if (used && (pStr + 1) == pHead)
return(pTail);
else if (pStr == pEnd)
return(pBeg);
else
return(++pStr);
}
const QString *xMultiLineBuf::prevLine(const QString *pStr, bool used)
{
if (pHead == pTail)
return(pHead);
else if (pStr == pTail && used)
{
if (pHead == pBeg)
return(pEnd);
else
return(pHead - 1);
}
else if (pStr == pBeg)
return(pEnd);
else
return(--pStr);
}
const QString *xMultiLineBuf::getNext(const QString *pStr, int &changed)
{
changed = FALSE;
if (pHead == pTail)
return(pStr);
if (pHead == pTail || (pStr + 1) == pHead ||
(pStr == pEnd && pHead == pBeg))
return(pStr);
else
{
changed = TRUE;
if (pStr == pEnd)
return(pBeg);
else
return(++pStr);
}
}
const QString *xMultiLineBuf::getPrev(const QString *pStr, int &changed)
{
changed = FALSE;
if (pHead == pTail || pStr == pTail)
return(pStr);
else
{
changed = TRUE;
if (pStr == pBeg)
return(pEnd);
else
return(--pStr);
}
}
const QString *xMultiLineBuf::putString(const char *pString)
{
const QString *rv;
if (dbg) fprintf(stdout, "MultiLineBuf::putString():Adding String: |%s|\n\r", (char *)pString);
rv = pHead;
*pHead = pString;
if (dbg) fprintf(stdout, "MultiLineBuf::putString():*pHead = |%s|\n\r", (const char *)*pHead);
if (((const QString *)pHead = nextLine(pHead)) == pTail)
(const QString *)pTail = nextLine(pTail);
return(rv);
}
const QString *xMultiLineBuf::pointLine(int ofs, int &retOfs, int &retLines)
{
const QString *rv;
rv = pTail;
if (pHead == pTail)
{
retLines = retOfs = 0;
return(pHead);
}
else if (ofs <= 0)
rv = lastLine();
else if (ofs >= getLinesUsed())
{
retOfs = 0;
retLines = getLinesUsed();
return(pTail);
}
else
{
if (ofs >= (pHead - pBeg))
rv = pEnd - (ofs - (pHead - pBeg));
else
rv = pHead - (ofs + 1);
if (rv >= pTail)
retOfs = rv - pTail;
else
retOfs = (rv - pBeg) + (pEnd - pHead);
retLines = getLinesUsed() - retOfs;
}
return(rv);
}
const QString *xMultiLineBuf::lastLine()
{
if (pHead == pTail)
return(pHead);
else if (pHead == pBeg)
return(pEnd);
else
return(pHead - 1);
}
int xMultiLineBuf::getLinesUsed()
{
if (pHead == pTail)
return(0);
else if (pHead > pTail)
return (pHead - pTail);
else
return((pEnd - pTail) + (pHead - pBeg) + 1);
}
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