WebCore/rendering/break_lines.cpp

/*
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2005 Apple Computer, Inc.
 *
 * 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; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */

#include "config.h"
#include "break_lines.h"

#include <QString.h>

#if __APPLE__
#include <CoreServices/CoreServices.h>
#endif

namespace khtml {

int nextBreakablePosition(const QChar *str, int pos, int len, bool breakNBSP)
{
#if __APPLE__
    OSStatus status = 0, findStatus = -1;
    static TextBreakLocatorRef breakLocator = 0;
#endif
    int nextUCBreak = -1;
    int i;
    unsigned short ch, lastCh;
    
    lastCh = pos > 0 ? str[pos - 1].unicode() : 0;
    for (i = pos; i < len; i++) {
        ch = str[i].unicode();
        if (ch == ' ' || ch == '\n' || ch == '\t' || (breakNBSP && ch == 0xa0))
            break;
        // Match WinIE's breaking strategy, which is to always allow breaks after hyphens and question marks.
        if (lastCh == '-' || lastCh == '?')
            break;
#if __APPLE__
        // FIXME: Rewrite break location using ICU.
        // If current character, or the previous character aren't simple latin1 then
        // use the UC line break locator.  UCFindTextBreak will report false if we
        // have a sequence of 0xa0 0x20 (nbsp, sp), so we explicity check for that
        // case.
        if ((ch > 0x7f && ch != 0xa0) || (lastCh > 0x7f && lastCh != 0xa0)) {
            if (nextUCBreak < i) {
                if (!breakLocator)
                    status = UCCreateTextBreakLocator(NULL, 0, kUCTextBreakLineMask, &breakLocator);
                if (status == 0)
                    findStatus = UCFindTextBreak(breakLocator, kUCTextBreakLineMask, 0, (const UniChar *)str, len, i, (UniCharArrayOffset *)&nextUCBreak);
            }
            if (findStatus == 0 && i == nextUCBreak && !(lastCh == ' ' || lastCh == '\n' || lastCh == '\t' || (breakNBSP && lastCh == 0xa0)))
                break;
        }
#endif
        lastCh = ch;
    }
    return i;
}

};