qsettings.cpp

奇趣公司比较新的qt/emd版本

            if (result.startsWith(QLatin1Char('@')))
                result.prepend(QLatin1Char('@'));
            break;
        }
#ifndef QT_NO_GEOM_VARIANT
        case QVariant::Rect: {
            QRect r = qvariant_cast<QRect>(v);
            result += QLatin1String("@Rect(");
            result += QString::number(r.x());
            result += QLatin1Char(' ');
            result += QString::number(r.y());
            result += QLatin1Char(' ');
            result += QString::number(r.width());
            result += QLatin1Char(' ');
            result += QString::number(r.height());
            result += QLatin1Char(')');
            break;
        }
        case QVariant::Size: {
            QSize s = qvariant_cast<QSize>(v);
            result += QLatin1String("@Size(");
            result += QString::number(s.width());
            result += QLatin1Char(' ');
            result += QString::number(s.height());
            result += QLatin1Char(')');
            break;
        }
        case QVariant::Point: {
            QPoint p = qvariant_cast<QPoint>(v);
            result += QLatin1String("@Point(");
            result += QString::number(p.x());
            result += QLatin1Char(' ');
            result += QString::number(p.y());
            result += QLatin1Char(')');
            break;
        }
#endif // !QT_NO_GEOM_VARIANT

        default: {
#ifndef QT_NO_DATASTREAM
            QByteArray a;
            {
                QDataStream s(&a, QIODevice::WriteOnly);
                s.setVersion(QDataStream::Qt_4_0);
                s << v;
            }

            result = QLatin1String("@Variant(");
            result += QString::fromLatin1(a.constData(), a.size());
            result += QLatin1Char(')');
#else
            Q_ASSERT("QSettings: Cannot save custom types without QDataStream support");
#endif
            break;
        }
    }

    return result;
}


QVariant QSettingsPrivate::stringToVariant(const QString &s)
{
    if (s.startsWith(QLatin1Char('@'))) {
        if (s.endsWith(QLatin1Char(')'))) {
            if (s.startsWith(QLatin1String("@ByteArray("))) {
                return QVariant(s.toLatin1().mid(11, s.size() - 12));
            } else if (s.startsWith(QLatin1String("@Variant("))) {
#ifndef QT_NO_DATASTREAM
                QByteArray a(s.toLatin1().mid(9));
                QDataStream stream(&a, QIODevice::ReadOnly);
                stream.setVersion(QDataStream::Qt_4_0);
                QVariant result;
                stream >> result;
                return result;
#else
                Q_ASSERT("QSettings: Cannot load custom types without QDataStream support");
#endif
#ifndef QT_NO_GEOM_VARIANT
            } else if (s.startsWith(QLatin1String("@Rect("))) {
                QStringList args = QSettingsPrivate::splitArgs(s, 5);
                if (args.size() == 4)
                    return QVariant(QRect(args[0].toInt(), args[1].toInt(), args[2].toInt(), args[3].toInt()));
            } else if (s.startsWith(QLatin1String("@Size("))) {
                QStringList args = QSettingsPrivate::splitArgs(s, 5);
                if (args.size() == 2)
                    return QVariant(QSize(args[0].toInt(), args[1].toInt()));
            } else if (s.startsWith(QLatin1String("@Point("))) {
                QStringList args = QSettingsPrivate::splitArgs(s, 6);
                if (args.size() == 2)
                    return QVariant(QPoint(args[0].toInt(), args[1].toInt()));
#endif
            } else if (s == QLatin1String("@Invalid()")) {
                return QVariant();
            }

        }
        if (s.startsWith(QLatin1String("@@")))
            return QVariant(s.mid(1));
    }

    return QVariant(s);
}

static const char hexDigits[] = "0123456789ABCDEF";

void QSettingsPrivate::iniEscapedKey(const QString &key, QByteArray &result)
{
    result.reserve(result.length() + key.length() * 3 / 2);
    for (int i = 0; i < key.size(); ++i) {
        uint ch = key.at(i).unicode();

        if (ch == '/') {
            result += '\\';
        } else if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z' || ch >= '0' && ch <= '9'
                || ch == '_' || ch == '-' || ch == '.') {
            result += (char)ch;
        } else if (ch <= 0xFF) {
            result += '%';
            result += hexDigits[ch / 16];
            result += hexDigits[ch % 16];
        } else {
            result += "%U";
            QByteArray hexCode;
            for (int i = 0; i < 4; ++i) {
                hexCode.prepend(hexDigits[ch % 16]);
                ch >>= 4;
            }
            result += hexCode;
        }
    }
}

bool QSettingsPrivate::iniUnescapedKey(const QByteArray &key, int from, int to, QString &result)
{
    bool lowercaseOnly = true;
    int i = from;
    result.reserve(result.length() + (to - from));
    while (i < to) {
        int ch = (uchar)key.at(i);

        if (ch == '\\') {
            result += QLatin1Char('/');
            ++i;
            continue;
        }

        if (ch != '%' || i == to - 1) {
            if (uint(ch - 'A') <= 'Z' - 'A') // only for ASCII
                lowercaseOnly = false;
            result += QLatin1Char(ch);
            ++i;
            continue;
        }

        int numDigits = 2;
        int firstDigitPos = i + 1;

        ch = key.at(i + 1);
        if (ch == 'U') {
            ++firstDigitPos;
            numDigits = 4;
        }

        if (firstDigitPos + numDigits > to) {
            result += QLatin1Char('%');
            // ### missing U
            ++i;
            continue;
        }

        bool ok;
        ch = key.mid(firstDigitPos, numDigits).toInt(&ok, 16);
        if (!ok) {
            result += QLatin1Char('%');
            // ### missing U
            ++i;
            continue;
        }

        QChar qch(ch);
        if (qch.isUpper())
            lowercaseOnly = false;
        result += qch;
        i = firstDigitPos + numDigits;
    }
    return lowercaseOnly;
}

void QSettingsPrivate::iniEscapedString(const QString &str, QByteArray &result)
{
    bool needsQuotes = false;
    bool escapeNextIfDigit = false;
    int i;
    int startPos = result.size();

    result.reserve(startPos + str.size() * 3 / 2);
    for (i = 0; i < str.size(); ++i) {
        uint ch = str.at(i).unicode();
        if (ch == ';' || ch == ',' || ch == '=')
            needsQuotes = true;

        if (escapeNextIfDigit
                && ((ch >= '0' && ch <= '9')
                    || (ch >= 'a' && ch <= 'f')
                    || (ch >= 'A' && ch <= 'F'))) {
            result += "\\x";
            result += QByteArray::number(ch, 16);
            continue;
        }

        escapeNextIfDigit = false;

        switch (ch) {
        case '\0':
            result += "\\0";
            escapeNextIfDigit = true;
            break;
        case '\a':
            result += "\\a";
            break;
        case '\b':
            result += "\\b";
            break;
        case '\f':
            result += "\\f";
            break;
        case '\n':
            result += "\\n";
            break;
        case '\r':
            result += "\\r";
            break;
        case '\t':
            result += "\\t";
            break;
        case '\v':
            result += "\\v";
            break;
        case '"':
        case '\\':
            result += '\\';
            result += (char)ch;
            break;
        default:
            if (ch <= 0x1F || ch >= 0x7F) {
                result += "\\x";
                result += QByteArray::number(ch, 16);
                escapeNextIfDigit = true;
            } else {
                result += (char)ch;
            }
        }
    }

    if (needsQuotes
            || (startPos < result.size() && (result.at(startPos) == ' '
                                                || result.at(result.size() - 1) == ' '))) {
        result.insert(startPos, '"');
        result += '"';
    }
}

inline static void iniChopTrailingSpaces(QString &str)
{
    int n = str.size() - 1;
    QChar ch;
    while (n >= 0 && ((ch = str.at(n)) == QLatin1Char(' ') || ch == QLatin1Char('\t')))
        str.truncate(n--);
}

void QSettingsPrivate::iniEscapedStringList(const QStringList &strs, QByteArray &result)
{
    if (strs.isEmpty()) {
        /*
            We need to distinguish between empty lists and one-item
            lists that contain an empty string. Ideally, we'd have a
            @EmptyList() symbol but that would break compatibility
            with Qt 4.0. @Invalid() stands for QVariant(), and
            QVariant().toStringList() returns an empty QStringList,
            so we're in good shape.

            ### Qt 5: Use a nicer syntax, e.g. @List, for variant lists
        */
        result += "@Invalid()";
    } else {
        for (int i = 0; i < strs.size(); ++i) {
            if (i != 0)
                result += ", ";
            iniEscapedString(strs.at(i), result);
        }
    }
}

bool QSettingsPrivate::iniUnescapedStringList(const QByteArray &str, int from, int to,
                                              QString &stringResult, QStringList &stringListResult)
{
    static const char escapeCodes[][2] =
    {
        { 'a', '\a' },
        { 'b', '\b' },
        { 'f', '\f' },
        { 'n', '\n' },
        { 'r', '\r' },
        { 't', '\t' },
        { 'v', '\v' },
        { '"', '"' },
        { '?', '?' },
        { '\'', '\'' },
        { '\\', '\\' }
    };
    static const int numEscapeCodes = sizeof(escapeCodes) / sizeof(escapeCodes[0]);

    bool isStringList = false;
    bool inQuotedString = false;
    bool currentValueIsQuoted = false;
    int escapeVal = 0;
    int i = from;
    char ch;

StSkipSpaces:
    while (i < to && ((ch = str.at(i)) == ' ' || ch == '\t'))
        ++i;
    // fallthrough

StNormal:
    while (i < to) {
        switch (str.at(i)) {
        case '\\':
            ++i;
            if (i >= to)
                goto end;

            ch = str.at(i++);
            for (int j = 0; j < numEscapeCodes; ++j) {
                if (ch == escapeCodes[j][0]) {
                    stringResult += QLatin1Char(escapeCodes[j][1]);
                    goto StNormal;
                }
            }

            if (ch == 'x') {
                escapeVal = 0;

                if (i >= to)
                    goto end;

                ch = str.at(i);
                if ((ch >= '0' && ch <= '9') || (ch >= 'A' && ch <= 'F') || (ch >= 'a' && ch <= 'f'))
                    goto StHexEscape;
            } else if (ch >= '0' && ch <= '7') {
                escapeVal = ch - '0';
                goto StOctEscape;
            } else if (ch == '\n' || ch == '\r') {
                if (i < to) {
                    char ch2 = str.at(i);
                    // \n, \r, \r\n, and \n\r are legitimate line terminators in INI files
                    if ((ch2 == '\n' || ch2 == '\r') && ch2 != ch)
                        ++i;
                }
            } else {
                // the character is skipped
            }
            break;
        case '"':
            ++i;
            currentValueIsQuoted = true;
            inQuotedString = !inQuotedString;
            if (!inQuotedString)
                goto StSkipSpaces;
            break;
        case ',':
            if (!inQuotedString) {
                if (!currentValueIsQuoted)
                    iniChopTrailingSpaces(stringResult);
                if (!isStringList) {
                    isStringList = true;
                    stringListResult.clear();
                    stringResult.squeeze();
                }
                stringListResult.append(stringResult);
                stringResult.clear();
                currentValueIsQuoted = false;
                ++i;
                goto StSkipSpaces;
            }
            // fallthrough
        default: {
            int j = i + 1;
            while (j < to) {
                ch = str.at(j);
                if (ch == '\\' || ch == '"' || ch == ',')
                    break;
                ++j;
            }

            int n = stringResult.size();
            stringResult.resize(n + (j - i));
            QChar *resultData = stringResult.data() + n;
            for (int k = i; k < j; ++k)
                *resultData++ = QLatin1Char(str.at(k));
            i = j;
        }
        }
    }
    goto end;

StHexEscape:
    if (i >= to) {
        stringResult += QChar(escapeVal);
        goto end;
    }

    ch = str.at(i);
    if (ch >= 'a')