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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QJSENGINE_H
#define QJSENGINE_H
#include <QtCore/qmetatype.h>
#include <QtCore/qvariant.h>
#include <QtCore/qsharedpointer.h>
#include <QtCore/qobject.h>
#include <QtQml/qjsvalue.h>
#include <QtQml/qjsmanagedvalue.h>
#include <QtQml/qqmldebug.h>
QT_BEGIN_NAMESPACE
template <typename T>
inline T qjsvalue_cast(const QJSValue &);
class QJSEnginePrivate;
class Q_QML_EXPORT QJSEngine
: public QObject
{
Q_OBJECT
Q_PROPERTY(QString uiLanguage READ uiLanguage WRITE setUiLanguage NOTIFY uiLanguageChanged)
public:
QJSEngine();
explicit QJSEngine(QObject *parent);
~QJSEngine() override;
QJSValue globalObject() const;
QJSValue evaluate(const QString &program, const QString &fileName = QString(), int lineNumber = 1, QStringList *exceptionStackTrace = nullptr);
QJSValue importModule(const QString &fileName);
bool registerModule(const QString &moduleName, const QJSValue &value);
QJSValue newObject();
QJSValue newSymbol(const QString &name);
QJSValue newArray(uint length = 0);
QJSValue newQObject(QObject *object);
QJSValue newQMetaObject(const QMetaObject* metaObject);
template <typename T>
QJSValue newQMetaObject()
{
return newQMetaObject(&T::staticMetaObject);
}
QJSValue newErrorObject(QJSValue::ErrorType errorType, const QString &message = QString());
template <typename T>
inline QJSValue toScriptValue(const T &value)
{
return create(QMetaType::fromType<T>(), &value);
}
template <typename T>
inline QJSManagedValue toManagedValue(const T &value)
{
return createManaged(QMetaType::fromType<T>(), &value);
}
template <typename T>
inline T fromScriptValue(const QJSValue &value)
{
return qjsvalue_cast<T>(value);
}
template <typename T>
inline T fromManagedValue(const QJSManagedValue &value)
{
return qjsvalue_cast<T>(value);
}
template <typename T>
inline T fromVariant(const QVariant &value)
{
if constexpr (std::is_same_v<T, QVariant>)
return value;
const QMetaType targetType = QMetaType::fromType<T>();
if (value.metaType() == targetType)
return *reinterpret_cast<const T *>(value.constData());
if constexpr (std::is_same_v<T,std::remove_const_t<std::remove_pointer_t<T>> const *>) {
using nonConstT = std::remove_const_t<std::remove_pointer_t<T>> *;
const QMetaType nonConstTargetType = QMetaType::fromType<nonConstT>();
if (value.metaType() == nonConstTargetType)
return *reinterpret_cast<const nonConstT *>(value.constData());
}
{
T t{};
if (convertVariant(value, targetType, &t))
return t;
QMetaType::convert(value.metaType(), value.constData(), targetType, &t);
return t;
}
}
void collectGarbage();
enum ObjectOwnership { CppOwnership, JavaScriptOwnership };
static void setObjectOwnership(QObject *, ObjectOwnership);
static ObjectOwnership objectOwnership(QObject *);
enum Extension {
TranslationExtension = 0x1,
ConsoleExtension = 0x2,
GarbageCollectionExtension = 0x4,
AllExtensions = 0xffffffff
};
Q_DECLARE_FLAGS(Extensions, Extension)
void installExtensions(Extensions extensions, const QJSValue &object = QJSValue());
void setInterrupted(bool interrupted);
bool isInterrupted() const;
QV4::ExecutionEngine *handle() const { return m_v4Engine; }
void throwError(const QString &message);
void throwError(QJSValue::ErrorType errorType, const QString &message = QString());
void throwError(const QJSValue &error);
bool hasError() const;
QJSValue catchError();
QString uiLanguage() const;
void setUiLanguage(const QString &language);
Q_SIGNALS:
void uiLanguageChanged();
private:
QJSManagedValue createManaged(QMetaType type, const void *ptr);
QJSValue create(QMetaType type, const void *ptr);
#if QT_VERSION < QT_VERSION_CHECK(7,0,0)
QJSValue create(int id, const void *ptr); // only there for BC reasons
#endif
static bool convertManaged(const QJSManagedValue &value, int type, void *ptr);
static bool convertManaged(const QJSManagedValue &value, QMetaType type, void *ptr);
static bool convertV2(const QJSValue &value, int type, void *ptr);
static bool convertV2(const QJSValue &value, QMetaType metaType, void *ptr);
bool convertVariant(const QVariant &value, QMetaType metaType, void *ptr);
template<typename T>
friend inline T qjsvalue_cast(const QJSValue &);
template<typename T>
friend inline T qjsvalue_cast(const QJSManagedValue &);
protected:
QJSEngine(QJSEnginePrivate &dd, QObject *parent = nullptr);
private:
QV4::ExecutionEngine *m_v4Engine;
Q_DISABLE_COPY(QJSEngine)
Q_DECLARE_PRIVATE(QJSEngine)
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QJSEngine::Extensions)
template<typename T>
T qjsvalue_cast(const QJSValue &value)
{
T t;
if (QJSEngine::convertV2(value, QMetaType::fromType<T>(), &t))
return t;
else if (value.isVariant())
return qvariant_cast<T>(value.toVariant());
return T();
}
template<typename T>
T qjsvalue_cast(const QJSManagedValue &value)
{
{
T t;
if (QJSEngine::convertManaged(value, QMetaType::fromType<T>(), &t))
return t;
}
return qvariant_cast<T>(value.toVariant());
}
template <>
inline QVariant qjsvalue_cast<QVariant>(const QJSValue &value)
{
return value.toVariant();
}
template <>
inline QVariant qjsvalue_cast<QVariant>(const QJSManagedValue &value)
{
return value.toVariant();
}
Q_QML_EXPORT QJSEngine *qjsEngine(const QObject *);
QT_END_NAMESPACE
#endif // QJSENGINE_H
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