textboundaries.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006 Zack Rusin <[e-mail]>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#include "TextBoundaries.h"
#include "NotImplemented.h"

#include <QString>
#include <QChar>

#include <QDebug>
#include <stdio.h>

#if QT_VERSION >= 0x040400
#include <qtextboundaryfinder.h>

namespace WebCore
{

int findNextWordFromIndex(UChar const* buffer, int len, int position, bool forward)
{
    QString str(reinterpret_cast<QChar const*>(buffer), len);
    QTextBoundaryFinder iterator(QTextBoundaryFinder::Word, str);
    iterator.setPosition(position >= len ? len - 1 : position);
    if (forward) {
        int pos = iterator.toNextBoundary();
        while (pos > 0) {
            if (QChar(buffer[pos-1]).isLetterOrNumber())
                return pos;
            pos = iterator.toNextBoundary();
        }
        return len;
    } else {
        int pos = iterator.toPreviousBoundary();
        while (pos > 0) {
            if (QChar(buffer[pos]).isLetterOrNumber())
                return pos;
            pos = iterator.toPreviousBoundary();
        }
        return 0;
    }
}

void findWordBoundary(UChar const* buffer, int len, int position, int* start, int* end)
{
    QString str(reinterpret_cast<QChar const*>(buffer), len);
    QTextBoundaryFinder iterator(QTextBoundaryFinder::Word, str);
    iterator.setPosition(position);
    *start = position > 0 ? iterator.toPreviousBoundary() : 0;
    *end = position == len ? len : iterator.toNextBoundary();
}

}

#else
namespace WebCore
{
    
int findNextWordFromIndex(UChar const* buffer, int len, int position, bool forward)
{
    QString str(reinterpret_cast<QChar const*>(buffer), len);
    notImplemented();
    return 0;
}

void findWordBoundary(UChar const* buffer, int len, int position, int* start, int* end)
{
    QString str(reinterpret_cast<QChar const*>(buffer), len);

    if (position > str.length()) {
        *start = 0;
        *end = 0;
        return;
    }

    int currentPosition = position - 1;
    QString foundWord;
    while (currentPosition >= 0 &&
           str[currentPosition].isLetter()) {
        foundWord.prepend(str[currentPosition]);
        --currentPosition;
    }

    // currentPosition == 0 means the first char is not letter
    // currentPosition == -1 means we reached the beginning
    int startPos = (currentPosition < 0) ? 0 : ++currentPosition;
    currentPosition = position;
    if (str[currentPosition].isLetter()) {
            while (str[currentPosition].isLetter()) {
                foundWord.append(str[currentPosition]);
                ++currentPosition;
            }
    }

    *start = startPos;
    *end = currentPosition;
}

}
#endif