qdiriterator.cpp

奇趣公司比较新的qt/emd版本

    if (!foundValidEntry)
        done = true;
}

/*!
    \internal

    This convenience function implements the iterator's filtering logics and
    applies then to the current directory entry.

    It returns true if the current entry matches the filters (i.e., the
    current entry will be returned as part of the directory iteration);
    otherwise, false is returned.
*/
bool QDirIteratorPrivate::matchesFilters(const QAbstractFileEngineIterator *it) const
{
    const bool filterPermissions = ((filters & QDir::PermissionMask)
                                    && (filters & QDir::PermissionMask) != QDir::PermissionMask);
    const bool skipDirs     = !(filters & (QDir::Dirs | QDir::AllDirs));
    const bool skipFiles    = !(filters & QDir::Files);
    const bool skipSymlinks = (filters & QDir::NoSymLinks);
    const bool doReadable   = !filterPermissions || (filters & QDir::Readable);
    const bool doWritable   = !filterPermissions || (filters & QDir::Writable);
    const bool doExecutable = !filterPermissions || (filters & QDir::Executable);
    const bool includeHidden = (filters & QDir::Hidden);
    const bool includeSystem = (filters & QDir::System);

#ifndef QT_NO_REGEXP
    // Prepare name filters
    QList<QRegExp> regexps;
    bool hasNameFilters = !nameFilters.isEmpty() && !(nameFilters.contains(QLatin1String("*")));
    if (hasNameFilters) {
        for (int i = 0; i < nameFilters.size(); ++i) {
            regexps << QRegExp(nameFilters.at(i),
                               (filters & QDir::CaseSensitive) ? Qt::CaseSensitive : Qt::CaseInsensitive,
                               QRegExp::Wildcard);
        }
    }
#endif

    QString fileName = it->currentFileName();
    if (fileName.isEmpty()) {
        // invalid entry
        return false;
    }

    QFileInfo fi = it->currentFileInfo();
    QString filePath = it->currentFilePath();

#ifndef QT_NO_REGEXP
    // Pass all entries through name filters, except dirs if the AllDirs
    // filter is passed.
    if (hasNameFilters && !((filters & QDir::AllDirs) && fi.isDir())) {
        bool matched = false;
        for (int i = 0; i < regexps.size(); ++i) {
            if (regexps.at(i).exactMatch(fileName)) {
                matched = true;
                break;
            }
        }
        if (!matched)
            return false;
    }
#endif
    
    bool dotOrDotDot = (fileName == QLatin1String(".") || fileName == QLatin1String(".."));
    if ((filters & QDir::NoDotAndDotDot) && dotOrDotDot)
        return false;

    bool isHidden = !dotOrDotDot && fi.isHidden();
    if (!includeHidden && isHidden)
        return false;

    bool isSystem = (!fi.isFile() && !fi.isDir() && !fi.isSymLink())
                    || (!fi.exists() && fi.isSymLink());
    if (!includeSystem && isSystem)
        return false;

    bool alwaysShow = (filters & QDir::TypeMask) == 0
        && ((isHidden && includeHidden)
            || (includeSystem && isSystem));

    // Skip files and directories
    if ((filters & QDir::AllDirs) == 0 && skipDirs && fi.isDir()) {
        if (!alwaysShow)
            return false;
    }

    if ((skipFiles && (fi.isFile() || !fi.exists()))
        || (skipSymlinks && fi.isSymLink())) {
        if (!alwaysShow)
            return false;
    }

    if (filterPermissions
        && ((doReadable && !fi.isReadable())
            || (doWritable && !fi.isWritable())
            || (doExecutable && !fi.isExecutable()))) {
        return false;
    }

    if (!includeSystem && !dotOrDotDot && ((fi.exists() && !fi.isFile() && !fi.isDir() && !fi.isSymLink())
                                           || (!fi.exists() && fi.isSymLink()))) {
        return false;
    }
    
    return true;
}

/*!
    Constructs a QDirIterator that can iterate over \a dir's entrylist, using
    \a dir's name filters and regular filters. You can pass options via \a
    flags to decide how the directory should be iterated.

    By default, \a flags is NoIteratorFlags, which provides the same behavior
    as in QDir::entryList().

    The sorting in \a dir is ignored.

    \sa hasNext(), next(), IteratorFlags
*/
QDirIterator::QDirIterator(const QDir &dir, IteratorFlags flags)
    : d(new QDirIteratorPrivate(dir.path(), dir.nameFilters(), dir.filter(), flags))
{
    d->q = this;
}

/*!
    Constructs a QDirIterator that can iterate over \a path, with no name
    filtering and \a filters for entry filtering. You can pass options via \a
    flags to decide how the directory should be iterated.

    By default, \a filters is QDir::NoFilter, and \a flags is NoIteratorFlags,
    which provides the same behavior as in QDir::entryList().

    \sa hasNext(), next(), IteratorFlags
*/
QDirIterator::QDirIterator(const QString &path, QDir::Filters filters, IteratorFlags flags)
    : d(new QDirIteratorPrivate(path, QStringList(QLatin1String("*")), filters, flags))
{
    d->q = this;
}

/*!
    Constructs a QDirIterator that can iterate over \a path. You can pass
    options via \a flags to decide how the directory should be iterated.

    By default, \a flags is NoIteratorFlags, which provides the same behavior
    as in QDir::entryList().

    \sa hasNext(), next(), IteratorFlags
*/
QDirIterator::QDirIterator(const QString &path, IteratorFlags flags)
    : d(new QDirIteratorPrivate(path, QStringList(QLatin1String("*")), QDir::NoFilter, flags))
{
    d->q = this;
}

/*!
    Constructs a QDirIterator that can iterate over \a path, using \a
    nameFilters and \a filters. You can pass options via \a flags to decide
    how the directory should be iterated.

    By default, \a flags is NoIteratorFlags, which provides the same behavior
    as QDir::entryList().

    \sa hasNext(), next(), IteratorFlags
*/
QDirIterator::QDirIterator(const QString &path, const QStringList &nameFilters,
                           QDir::Filters filters, IteratorFlags flags)
    : d(new QDirIteratorPrivate(path, nameFilters, filters, flags))
{
    d->q = this;
}

/*!
    Destroys the QDirIterator.
*/
QDirIterator::~QDirIterator()
{
    qDeleteAll(d->fileEngineIterators);
    delete d;
}

/*!
    Advances the iterator to the next entry, and returns the file path of this
    new entry. If hasNext() returns false, this function does nothing, and
    returns a null QString.

    You can call fileName() or filePath() to get the current entry file name
    or path, or fileInfo() to get a QFileInfo for the current entry.

    \sa hasNext(), fileName(), filePath(), fileInfo()
*/
QString QDirIterator::next()
{
    if (!hasNext())
        return QString();
    d->advance();
    return filePath();
}

/*!
    Returns true if there is at least one more entry in the directory;
    otherwise, false is returned.

    \sa next(), fileName(), filePath(), fileInfo()
*/
bool QDirIterator::hasNext() const
{
    if (d->first) {
        d->first = false;
        d->advance();
        if (!d->fileEngineIterators.isEmpty())
            d->currentFilePath = d->fileEngineIterators.top()->currentFilePath();
    }
    return !d->done;
}

/*!
    Returns the file name for the current directory entry, without the path
    prepended. If the current entry is invalid (i.e., isValid() returns
    false), a null QString is returned.

    This function is provided for the convenience when iterating single
    directories. For recursive iteration, you should call filePath() or
    fileInfo() instead.
    
    \sa filePath(), fileInfo()
*/
QString QDirIterator::fileName() const
{
    if (d->fileInfo.path() != d->currentFilePath)
        d->fileInfo.setFile(d->currentFilePath);
    return d->fileInfo.fileName();
}

/*!
    Returns the full file path for the current directory entry. If the current
    entry is invalid (i.e., isValid() returns false), a null QString is
    returned.

    \sa fileInfo(), fileName()
*/
QString QDirIterator::filePath() const
{
    return d->currentFilePath;
}

/*!
    Returns a QFileInfo for the current directory entry. If the current entry
    is invalid (i.e., isValid() returns false), a null QFileInfo is returned.

    \sa filePath(), fileName()
*/
QFileInfo QDirIterator::fileInfo() const
{
    if (d->fileInfo.filePath() != d->currentFilePath)
        d->fileInfo.setFile(d->currentFilePath);
    return d->fileInfo;
}

/*!
    Returns the base directory of the iterator.
*/
QString QDirIterator::path() const
{
    return d->path;
}