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** This file is part of the Qt Designer of the Qt Toolkit.

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

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****************************************************************************/

#include "qdesigner_widgetbox_p.h"

#include "qdesigner_utils_p.h"

#include <ui4_p.h>

#include <QtCore/QRegExp>

#include <QtCore/QDebug>

#include <QtCore/QXmlStreamReader>

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

QDesignerWidgetBox::QDesignerWidgetBox(QWidget *parent, Qt::WindowFlags flags)

    : QDesignerWidgetBoxInterface(parent, flags),

      m_loadMode(LoadMerge)

{

}

QDesignerWidgetBox::LoadMode QDesignerWidgetBox::loadMode() const

{

    return m_loadMode;

}

void QDesignerWidgetBox::setLoadMode(LoadMode lm)

{

     m_loadMode = lm;

}

// Convenience to find a widget by class name

bool QDesignerWidgetBox::findWidget(const QDesignerWidgetBoxInterface *wbox,

                                    const QString &className,

                                    const QString &category,

                                    Widget *widgetData)

{

    // Note that entry names do not necessarily match the class name

    // (at least, not for the standard widgets), so,

    // look in the XML for the class name of the first widget to appear

    const QString widgetTag = QLatin1String("<widget");

    QString pattern = QLatin1String("^<widget\\s+class\\s*=\\s*\"");

    pattern += className;

    pattern += QLatin1String("\".*$");

    const QRegExp regexp(pattern);

    Q_ASSERT(regexp.isValid());

    const int catCount = wbox->categoryCount();

    for (int c = 0; c < catCount; c++) {

        const Category cat = wbox->category(c);

        if (category.isEmpty() || cat.name() == category) {

            const int widgetCount =  cat.widgetCount();

            for (int w = 0; w < widgetCount; w++) {

                const Widget widget = cat.widget(w);

                QString xml = widget.domXml(); // Erase the <ui> tag that can be present starting from 4.4

                const int widgetTagIndex = xml.indexOf(widgetTag);

                if (widgetTagIndex != -1) {

                    xml.remove(0, widgetTagIndex);

                    if (regexp.exactMatch(xml)) {

                        *widgetData = widget;

                        return true;

                    }

                }

            }

        }

    }

    return false;

}

// Convenience to create a Dom Widget from widget box xml code.

DomUI *QDesignerWidgetBox::xmlToUi(const QString &name, const QString &xml, bool insertFakeTopLevel,

                                   QString *errorMessage)

{

    QXmlStreamReader reader(xml);

    DomUI *ui = 0;

    // The xml description must either contain a root element "ui" with a child element "widget"

    // or "widget" as the root element (4.3 legacy)

    const QString widgetTag = QLatin1String("widget");

    while (!reader.atEnd()) {

        if (reader.readNext() == QXmlStreamReader::StartElement) {

            const QStringRef name = reader.name();

            if (ui) {

                reader.raiseError(tr("Unexpected element <%1>").arg(name.toString()));

                continue;

            }

            if (name.compare(QLatin1String("widget"), Qt::CaseInsensitive) == 0) { // 4.3 legacy, wrap into DomUI

                ui = new DomUI;

                DomWidget *widget = new DomWidget;

                widget->read(reader);

                ui->setElementWidget(widget);

            } else if (name.compare(QLatin1String("ui"), Qt::CaseInsensitive) == 0) { // 4.4

                ui = new DomUI;

                ui->read(reader);

            } else {

                reader.raiseError(tr("Unexpected element <%1>").arg(name.toString()));

            }

        }

   }

    if (reader.hasError()) {

        delete ui;

        *errorMessage = tr("A parse error occurred at line %1, column %2 of the XML code "

                           "specified for the widget %3: %4\n%5")

                           .arg(reader.lineNumber()).arg(reader.columnNumber()).arg(name)

                           .arg(reader.errorString()).arg(xml);

        return 0;

    }

    if (!ui || !ui->elementWidget()) {

        delete ui;

        *errorMessage = tr("The XML code specified for the widget %1 does not contain "

                           "any widget elements.\n%2").arg(name).arg(xml);

        return 0;

    }

    if (insertFakeTopLevel)  {

        DomWidget *fakeTopLevel = new DomWidget;

        fakeTopLevel->setAttributeClass(QLatin1String("QWidget"));

        QList<DomWidget *> children;

        children.push_back(ui->takeElementWidget());

        fakeTopLevel->setElementWidget(children);

        ui->setElementWidget(fakeTopLevel);

    }

    return ui;

}

// Convenience to create a Dom Widget from widget box xml code.

DomUI *QDesignerWidgetBox::xmlToUi(const QString &name, const QString &xml, bool insertFakeTopLevel)

{

    QString errorMessage;

    DomUI *rc = xmlToUi(name, xml, insertFakeTopLevel, &errorMessage);

    if (!rc)

        qdesigner_internal::designerWarning(errorMessage);

    return rc;

}

}  // namespace qdesigner_internal

QT_END_NAMESPACE