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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtQml module 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
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** 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
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****************************************************************************/

#include "qqmlinfo.h"

#include "qqmldata_p.h"
#include "qqmlcontext.h"
#include "qqmlcontext_p.h"
#include "qqmlmetatype_p.h"
#include "qqmlengine_p.h"

#include <QCoreApplication>

QT_BEGIN_NAMESPACE

/*!
    \fn QQmlInfo qmlInfo(const QObject *object)
    \relates QQmlEngine

    Prints warning messages that include the file and line number for the
    specified QML \a object.

    When QML types display warning messages, it improves traceability
    if they include the QML file and line number on which the
    particular instance was instantiated.
    
    To include the file and line number, an object must be passed.  If
    the file and line number is not available for that instance
    (either it was not instantiated by the QML engine or location
    information is disabled), "unknown location" will be used instead.

    For example, 

    \code
    qmlInfo(object) << tr("component property is a write-once property");
    \endcode

    prints

    \code
    QML MyCustomType (unknown location): component property is a write-once property
    \endcode
*/

class QQmlInfoPrivate
{
public:
    QQmlInfoPrivate() : ref (1), object(0) {}

    int ref;
    const QObject *object;
    QString buffer;
    QList<QQmlError> errors;
};

QQmlInfo::QQmlInfo(QQmlInfoPrivate *p)
: QDebug(&p->buffer), d(p)
{
    nospace();
}

QQmlInfo::QQmlInfo(const QQmlInfo &other)
: QDebug(other), d(other.d)
{
    d->ref++;
}

QQmlInfo::~QQmlInfo()
{
    if (0 == --d->ref) {
        QList<QQmlError> errors = d->errors;

        QQmlEngine *engine = 0;

        if (!d->buffer.isEmpty()) {
            QQmlError error;

            QObject *object = const_cast<QObject *>(d->object);

            if (object) {
                engine = qmlEngine(d->object);
                QString typeName;
                QQmlType *type = QQmlMetaType::qmlType(object->metaObject());
                if (type) {
                    typeName = type->qmlTypeName();
                    int lastSlash = typeName.lastIndexOf(QLatin1Char('/'));
                    if (lastSlash != -1)
                        typeName = typeName.mid(lastSlash+1);
                } else {
                    typeName = QString::fromUtf8(object->metaObject()->className());
                    int marker = typeName.indexOf(QLatin1String("_QMLTYPE_"));
                    if (marker != -1)
                        typeName = typeName.left(marker);

                    marker = typeName.indexOf(QLatin1String("_QML_"));
                    if (marker != -1) {
                        typeName = typeName.left(marker);
                        typeName += QLatin1Char('*');
                        type = QQmlMetaType::qmlType(QMetaType::type(typeName.toLatin1()));
                        if (type) {
                            typeName = type->qmlTypeName();
                            int lastSlash = typeName.lastIndexOf(QLatin1Char('/'));
                            if (lastSlash != -1)
                                typeName = typeName.mid(lastSlash+1);
                        }
                    }
                }

                d->buffer.prepend(QLatin1String("QML ") + typeName + QLatin1String(": "));

                QQmlData *ddata = QQmlData::get(object, false);
                if (ddata && ddata->outerContext && !ddata->outerContext->url.isEmpty()) {
                    error.setUrl(ddata->outerContext->url);
                    error.setLine(ddata->lineNumber);
                    error.setColumn(ddata->columnNumber);
                }
            }

            error.setDescription(d->buffer);

            errors.prepend(error);
        }

        QQmlEnginePrivate::warning(engine, errors);

        delete d;
    }
}

QQmlInfo qmlInfo(const QObject *me)
{
    QQmlInfoPrivate *d = new QQmlInfoPrivate;
    d->object = me;
    return QQmlInfo(d);
}

QQmlInfo qmlInfo(const QObject *me, const QQmlError &error)
{
    QQmlInfoPrivate *d = new QQmlInfoPrivate;
    d->object = me;
    d->errors << error;
    return QQmlInfo(d);
}

QQmlInfo qmlInfo(const QObject *me, const QList<QQmlError> &errors)
{
    QQmlInfoPrivate *d = new QQmlInfoPrivate;
    d->object = me;
    d->errors = errors;
    return QQmlInfo(d);
}


QT_END_NAMESPACE
