qqmlstringconverters.cpp

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** This file may be used under the terms of the GNU Lesser General Public
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** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
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** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
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****************************************************************************/

#include "qqmlstringconverters_p.h"

#include <QtGui/qcolor.h>
#include <QtGui/qvector3d.h>
#include <QtGui/qvector4d.h>
#include <QtCore/qpoint.h>
#include <QtCore/qrect.h>
#include <QtCore/qsize.h>
#include <QtCore/qvariant.h>
#include <QtCore/qdatetime.h>

QT_BEGIN_NAMESPACE

static uchar fromHex(const uchar c, const uchar c2)
{
    uchar rv = 0;
    if (c >= '0' && c <= '9')
        rv += (c - '0') * 16;
    else if (c >= 'A' && c <= 'F')
        rv += (c - 'A' + 10) * 16;
    else if (c >= 'a' && c <= 'f')
        rv += (c - 'a' + 10) * 16;

    if (c2 >= '0' && c2 <= '9')
        rv += (c2 - '0');
    else if (c2 >= 'A' && c2 <= 'F')
        rv += (c2 - 'A' + 10);
    else if (c2 >= 'a' && c2 <= 'f')
        rv += (c2 - 'a' + 10);

    return rv;
}

static uchar fromHex(const QString &s, int idx)
{
    uchar c = s.at(idx).toAscii();
    uchar c2 = s.at(idx + 1).toAscii();
    return fromHex(c, c2);
}

QVariant QQmlStringConverters::variantFromString(const QString &s)
{
    if (s.isEmpty())
        return QVariant(s);
    bool ok = false;
    QRectF r = rectFFromString(s, &ok);
    if (ok) return QVariant(r);
    QColor c = colorFromString(s, &ok);
    if (ok) return QVariant(c);
    QPointF p = pointFFromString(s, &ok);
    if (ok) return QVariant(p);
    QSizeF sz = sizeFFromString(s, &ok);
    if (ok) return QVariant(sz);
    QVector3D v = vector3DFromString(s, &ok);
    if (ok) return QVariant::fromValue(v);
    QVector4D v4 = vector4DFromString(s, &ok);
    if (ok) return QVariant::fromValue(v4);

    return QVariant(s);
}

QVariant QQmlStringConverters::variantFromString(const QString &s, int preferredType, bool *ok)
{
    switch (preferredType) {
    case QMetaType::Int:
        return QVariant(int(qRound(s.toDouble(ok))));
    case QMetaType::UInt:
        return QVariant(uint(qRound(s.toDouble(ok))));
    case QMetaType::QColor:
        return QVariant::fromValue(colorFromString(s, ok));
#ifndef QT_NO_DATESTRING
    case QMetaType::QDate:
        return QVariant::fromValue(dateFromString(s, ok));
    case QMetaType::QTime:
        return QVariant::fromValue(timeFromString(s, ok));
    case QMetaType::QDateTime:
        return QVariant::fromValue(dateTimeFromString(s, ok));
#endif // QT_NO_DATESTRING
    case QMetaType::QPointF:
        return QVariant::fromValue(pointFFromString(s, ok));
    case QMetaType::QPoint:
        return QVariant::fromValue(pointFFromString(s, ok).toPoint());
    case QMetaType::QSizeF:
        return QVariant::fromValue(sizeFFromString(s, ok));
    case QMetaType::QSize:
        return QVariant::fromValue(sizeFFromString(s, ok).toSize());
    case QMetaType::QRectF:
        return QVariant::fromValue(rectFFromString(s, ok));
    case QMetaType::QRect:
        return QVariant::fromValue(rectFFromString(s, ok).toRect());
    case QMetaType::QVector3D:
        return QVariant::fromValue(vector3DFromString(s, ok));
    case QMetaType::QVector4D:
        return QVariant::fromValue(vector4DFromString(s, ok));
    default:
        if (ok) *ok = false;
        return QVariant();
    }
}

QColor QQmlStringConverters::colorFromString(const QString &s, bool *ok)
{
    if (s.length() == 9 && s.startsWith(QLatin1Char('#'))) {
        uchar a = fromHex(s, 1);
        uchar r = fromHex(s, 3);
        uchar g = fromHex(s, 5);
        uchar b = fromHex(s, 7);
        if (ok) *ok = true;
        return QColor(r, g, b, a);
    } else {
        QColor rv(s);
        if (ok) *ok = rv.isValid();
        return rv;
    }
}

#ifndef QT_NO_DATESTRING
QDate QQmlStringConverters::dateFromString(const QString &s, bool *ok)
{
    QDate d = QDate::fromString(s, Qt::ISODate);
    if (ok) *ok =  d.isValid();
    return d;
}

QTime QQmlStringConverters::timeFromString(const QString &s, bool *ok)
{
    QTime t = QTime::fromString(s, Qt::ISODate);
    if (ok) *ok = t.isValid();
    return t;
}

QDateTime QQmlStringConverters::dateTimeFromString(const QString &s, bool *ok)
{
    QDateTime d = QDateTime::fromString(s, Qt::ISODate);
    if (ok) *ok =  d.isValid();
    return d;
}
#endif // QT_NO_DATESTRING

//expects input of "x,y"
QPointF QQmlStringConverters::pointFFromString(const QString &s, bool *ok)
{
    if (s.count(QLatin1Char(',')) != 1) {
        if (ok)
            *ok = false;
        return QPointF();
    }

    bool xGood, yGood;
    int index = s.indexOf(QLatin1Char(','));
    qreal xCoord = s.left(index).toDouble(&xGood);
    qreal yCoord = s.mid(index+1).toDouble(&yGood);
    if (!xGood || !yGood) {
        if (ok)
            *ok = false;
        return QPointF();
    }

    if (ok)
        *ok = true;
    return QPointF(xCoord, yCoord);
}

//expects input of "widthxheight"
QSizeF QQmlStringConverters::sizeFFromString(const QString &s, bool *ok)
{
    if (s.count(QLatin1Char('x')) != 1) {
        if (ok)
            *ok = false;
        return QSizeF();
    }

    bool wGood, hGood;
    int index = s.indexOf(QLatin1Char('x'));
    qreal width = s.left(index).toDouble(&wGood);
    qreal height = s.mid(index+1).toDouble(&hGood);
    if (!wGood || !hGood) {
        if (ok)
            *ok = false;
        return QSizeF();
    }

    if (ok)
        *ok = true;
    return QSizeF(width, height);
}

//expects input of "x,y,widthxheight" //### use space instead of second comma?
QRectF QQmlStringConverters::rectFFromString(const QString &s, bool *ok)
{
    if (s.count(QLatin1Char(',')) != 2 || s.count(QLatin1Char('x')) != 1) {
        if (ok)
            *ok = false;
        return QRectF();
    }

    bool xGood, yGood, wGood, hGood;
    int index = s.indexOf(QLatin1Char(','));
    qreal x = s.left(index).toDouble(&xGood);
    int index2 = s.indexOf(QLatin1Char(','), index+1);
    qreal y = s.mid(index+1, index2-index-1).toDouble(&yGood);
    index = s.indexOf(QLatin1Char('x'), index2+1);
    qreal width = s.mid(index2+1, index-index2-1).toDouble(&wGood);
    qreal height = s.mid(index+1).toDouble(&hGood);
    if (!xGood || !yGood || !wGood || !hGood) {
        if (ok)
            *ok = false;
        return QRectF();
    }

    if (ok)
        *ok = true;
    return QRectF(x, y, width, height);
}

//expects input of "x,y,z"
QVector3D QQmlStringConverters::vector3DFromString(const QString &s, bool *ok)
{
    if (s.count(QLatin1Char(',')) != 2) {
        if (ok)
            *ok = false;
        return QVector3D();
    }

    bool xGood, yGood, zGood;
    int index = s.indexOf(QLatin1Char(','));
    int index2 = s.indexOf(QLatin1Char(','), index+1);
    qreal xCoord = s.left(index).toDouble(&xGood);
    qreal yCoord = s.mid(index+1, index2-index-1).toDouble(&yGood);
    qreal zCoord = s.mid(index2+1).toDouble(&zGood);
    if (!xGood || !yGood || !zGood) {
        if (ok)
            *ok = false;
        return QVector3D();
    }

    if (ok)
        *ok = true;
    return QVector3D(xCoord, yCoord, zCoord);
}

//expects input of "x,y,z,w"
QVector4D QQmlStringConverters::vector4DFromString(const QString &s, bool *ok)
{
    if (s.count(QLatin1Char(',')) != 3) {
        if (ok)
            *ok = false;
        return QVector4D();
    }

    bool xGood, yGood, zGood, wGood;
    int index = s.indexOf(QLatin1Char(','));
    int index2 = s.indexOf(QLatin1Char(','), index+1);
    int index3 = s.indexOf(QLatin1Char(','), index2+1);
    qreal xCoord = s.left(index).toDouble(&xGood);
    qreal yCoord = s.mid(index+1, index2-index-1).toDouble(&yGood);
    qreal zCoord = s.mid(index2+1, index3-index2-1).toDouble(&zGood);
    qreal wCoord = s.mid(index3+1).toDouble(&wGood);
    if (!xGood || !yGood || !zGood || !wGood) {
        if (ok)
            *ok = false;
        return QVector4D();
    }

    if (ok)
        *ok = true;
    return QVector4D(xCoord, yCoord, zCoord, wCoord);
}

QT_END_NAMESPACE