path: root/src/qml/qml/qqmlinfo.cpp

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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 QtQml::qmlDebug(const QObject *object)
    \relates QQmlEngine
    \since 5.9

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

    When QML types produce logging 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
    qmlDebug(object) << "Internal state: 42";
    \endcode

    prints

    \code
    QML MyCustomType (unknown location): Internal state: 42
    \endcode

    \sa QtQml::qmlInfo, QtQml::qmlWarning
*/

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

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

    When QML types produce logging 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

    \note In versions prior to Qt 5.9, qmlInfo reported messages using a warning
    QtMsgType. For Qt 5.9 and above, qmlInfo uses an info QtMsgType. To send
    warnings, use qmlWarning.

    \sa QtQml::qmlDebug, QtQml::qmlWarning
*/


/*!
    \fn QQmlInfo QtQml::qmlWarning(const QObject *object)
    \relates QQmlEngine
    \since 5.9

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

    When QML types produce logging 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("property cannot be set to 0");
    \endcode

    prints

    \code
    QML MyCustomType (unknown location): property cannot be set to 0
    \endcode

    \sa QtQml::qmlDebug, QtQml::qmlInfo
*/

class QQmlInfoPrivate
{
public:
    QQmlInfoPrivate(QtMsgType type)
        : ref (1)
        , msgType(type)
        , object(nullptr)
    {}

    int ref;
    QtMsgType msgType;
    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;
            error.setMessageType(d->msgType);

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

            if (object) {
                engine = qmlEngine(d->object);

                d->buffer.prepend(QLatin1String("QML ") + QQmlMetaType::prettyTypeName(object) + QLatin1String(": "));

                QQmlData *ddata = QQmlData::get(object, false);
                if (ddata && ddata->outerContext) {
                    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;
    }
}

namespace QtQml {

#define MESSAGE_FUNCS(FuncName, MessageLevel) \
    QQmlInfo FuncName(const QObject *me) \
    { \
        QQmlInfoPrivate *d = new QQmlInfoPrivate(MessageLevel); \
        d->object = me; \
        return QQmlInfo(d); \
    } \
    QQmlInfo FuncName(const QObject *me, const QQmlError &error) \
    { \
        QQmlInfoPrivate *d = new QQmlInfoPrivate(MessageLevel); \
        d->object = me; \
        d->errors << error; \
        return QQmlInfo(d); \
    } \
    QQmlInfo FuncName(const QObject *me, const QList<QQmlError> &errors) \
    { \
        QQmlInfoPrivate *d = new QQmlInfoPrivate(MessageLevel); \
        d->object = me; \
        d->errors = errors; \
        return QQmlInfo(d); \
    }

MESSAGE_FUNCS(qmlDebug, QtMsgType::QtDebugMsg)
MESSAGE_FUNCS(qmlInfo, QtMsgType::QtInfoMsg)
MESSAGE_FUNCS(qmlWarning, QtMsgType::QtWarningMsg)


} // namespace QtQml

#if QT_DEPRECATED_SINCE(5, 1)

// Also define symbols outside namespace to keep binary compatibility with Qt 5.0

QQmlInfo qmlInfo(const QObject *me)
{
    return QtQml::qmlInfo(me);
}

QQmlInfo qmlInfo(const QObject *me, const QQmlError &error)
{
    return QtQml::qmlInfo(me, error);
}

QQmlInfo qmlInfo(const QObject *me, const QList<QQmlError> &errors)
{
    return QtQml::qmlInfo(me, errors);
}

#endif // QT_DEPRECATED_SINCE(5, 1)

QT_END_NAMESPACE