Move conversions to and from *Iterables into QMetaType

Those were not yet supported by QMetaType.

Change-Id: I9f85476049f200e35939ac58ef7e8b4e7cbe0b77
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

5 files changed, 200 insertions, 148 deletions

diff --git a/src/corelib/kernel/qmetatype.cpp b/src/corelib/kernel/qmetatype.cpp
index e8f359a366..072b27b573 100644
--- a/src/corelib/kernel/qmetatype.cpp
+++ b/src/corelib/kernel/qmetatype.cpp
@@ -1152,6 +1152,19 @@ static const struct : QMetaTypeModuleHelper
         QMETATYPE_CONVERTER_ASSIGN(QPointF, QPoint);
  #endif
 
+        QMETATYPE_CONVERTER(QByteArrayList, QVariantList,
+            result.reserve(source.size());
+            for (auto v: source)
+                result.append(v.toByteArray());
+            return true;
+        );
+        QMETATYPE_CONVERTER(QVariantList, QByteArrayList,
+            result.reserve(source.size());
+            for (auto v: source)
+                result.append(QVariant(v));
+            return true;
+        );
+
         QMETATYPE_CONVERTER(QStringList, QVariantList,
             result.reserve(source.size());
             for (auto v: source)
@@ -1829,6 +1842,142 @@ static bool convertToEnum(const void *from, int fromTypeId, void *to, const QMet
     }
 }
 
+static bool convertIterableToVariantList(const void *from, int fromTypeId, void *to)
+{
+    const QMetaType::ConverterFunction * const f =
+        customTypesConversionRegistry()->function(qMakePair(fromTypeId,
+                                                            qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>()));
+    if (!f)
+        return false;
+
+    QtMetaTypePrivate::QSequentialIterableImpl iter;
+    (*f)(from, &iter);
+    QSequentialIterable list(iter);
+    QVariantList &l = *static_cast<QVariantList *>(to);
+    l.clear();
+    l.reserve(list.size());
+    auto end = list.end();
+    for (auto it = list.begin(); it != end; ++it)
+        l << *it;
+    return true;
+}
+
+static bool convertIterableToVariantMap(const void *from, int fromTypeId, void *to)
+{
+    const QMetaType::ConverterFunction * const f =
+        customTypesConversionRegistry()->function(qMakePair(fromTypeId,
+                                                            qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>()));
+    if (!f)
+        return false;
+
+    QtMetaTypePrivate::QAssociativeIterableImpl iter;
+    (*f)(from, &iter);
+    QAssociativeIterable map(iter);
+    QVariantMap &h = *static_cast<QVariantMap *>(to);
+    h.clear();
+    auto end = map.end();
+    for (auto it = map.begin(); it != end; ++it)
+        h.insert(it.key().toString(), it.value());
+    return true;
+}
+
+static bool convertIterableToVariantHash(const void *from, int fromTypeId, void *to)
+{
+    const QMetaType::ConverterFunction * const f =
+        customTypesConversionRegistry()->function(qMakePair(fromTypeId,
+                                                            qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>()));
+    if (!f)
+        return false;
+
+    QtMetaTypePrivate::QAssociativeIterableImpl iter;
+    (*f)(from, &iter);
+    QAssociativeIterable map(iter);
+    QVariantHash &h = *static_cast<QVariantHash *>(to);
+    h.clear();
+    h.reserve(map.size());
+    auto end = map.end();
+    for (auto it = map.begin(); it != end; ++it)
+        h.insert(it.key().toString(), it.value());
+    return true;
+}
+
+static bool convertIterableToVariantPair(const void *from, int fromTypeId, void *to)
+{
+    const QMetaType::ConverterFunction * const f =
+        customTypesConversionRegistry()->function(qMakePair(fromTypeId,
+                                                            qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>()));
+    if (!f)
+        return false;
+
+    QtMetaTypePrivate::QPairVariantInterfaceImpl pi;
+    (*f)(from, &pi);
+
+    QVariant v1(pi._metaType_first);
+    void *dataPtr;
+    if (pi._metaType_first == QMetaType::fromType<QVariant>())
+        dataPtr = &v1;
+    else
+        dataPtr = v1.data();
+    pi.first(dataPtr);
+
+    QVariant v2(pi._metaType_second);
+    if (pi._metaType_second == QMetaType::fromType<QVariant>())
+        dataPtr = &v2;
+    else
+        dataPtr = v2.data();
+    pi.second(dataPtr);
+
+    *static_cast<QVariantPair *>(to) = QVariantPair(v1, v2);
+    return true;
+}
+
+static bool convertToSequentialIterable(const void *from, int fromTypeId, void *to)
+{
+    using namespace QtMetaTypePrivate;
+
+    QSequentialIterable &i = *static_cast<QSequentialIterable *>(to);
+    if (fromTypeId == QMetaType::QVariantList) {
+        i = QSequentialIterable(QSequentialIterableImpl(reinterpret_cast<const QVariantList *>(from)));
+        return true;
+    }
+    if (fromTypeId == QMetaType::QStringList) {
+        i = QSequentialIterable(QSequentialIterableImpl(reinterpret_cast<const QStringList *>(from)));
+        return true;
+    }
+    else if (fromTypeId == QMetaType::QByteArrayList) {
+        i = QSequentialIterable(QSequentialIterableImpl(reinterpret_cast<const QByteArrayList *>(from)));
+        return true;
+    }
+    QSequentialIterableImpl impl;
+    if (QMetaType::convert(from, fromTypeId, &impl, qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>())) {
+        i = QSequentialIterable(impl);
+        return true;
+    }
+    return false;
+}
+
+static bool convertToAssociativeIterable(const void *from, int fromTypeId, void *to)
+{
+    using namespace QtMetaTypePrivate;
+
+    QAssociativeIterable &i = *static_cast<QAssociativeIterable *>(to);
+    if (fromTypeId == QMetaType::QVariantMap) {
+        i = QAssociativeIterable(QAssociativeIterableImpl(reinterpret_cast<const QVariantMap *>(from)));
+        return true;
+    }
+    if (fromTypeId == QMetaType::QVariantHash) {
+        i = QAssociativeIterable(QAssociativeIterableImpl(reinterpret_cast<const QVariantHash *>(from)));
+        return true;
+    }
+    QAssociativeIterableImpl impl;
+    if (QMetaType::convert(from, fromTypeId, &impl, qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>())) {
+        i = QAssociativeIterable(impl);
+        return true;
+    }
+    return false;
+}
+
+
 #ifndef QT_BOOTSTRAPPED
 static bool canConvertMetaObject(const QMetaType &fromType, const QMetaType &toType)
 {
@@ -1840,7 +1989,6 @@ static bool canConvertMetaObject(const QMetaType &fromType, const QMetaType &toT
 }
 #endif
 
-
 /*!
     Converts the object at \a from from \a fromTypeId to the preallocated space at \a to
     typed \a toTypeId. Returns \c true, if the conversion succeeded, otherwise false.
@@ -1880,6 +2028,26 @@ bool QMetaType::convert(const void *from, int fromTypeId, void *to, int toTypeId
                 return true;
         }
     }
+
+    // handle iterables
+    if (toTypeId == QVariantList && convertIterableToVariantList(from, fromTypeId, to))
+        return true;
+
+    if (toTypeId == QVariantMap && convertIterableToVariantMap(from, fromTypeId, to))
+        return true;
+
+    if (toTypeId == QVariantHash && convertIterableToVariantHash(from, fromTypeId, to))
+        return true;
+
+    if (toTypeId == QVariantPair && convertIterableToVariantPair(from, fromTypeId, to))
+        return true;
+
+    if (toTypeId == qMetaTypeId<QSequentialIterable>())
+        return convertToSequentialIterable(from, fromTypeId, to);
+
+    if (toTypeId == qMetaTypeId<QAssociativeIterable>())
+        return convertToAssociativeIterable(from, fromTypeId, to);
+
     return false;
 }
 
@@ -1969,22 +2137,34 @@ bool QMetaType::canConvert(const QMetaType &fromType, const QMetaType &toType)
         if (moduleHelper->convert(nullptr, fromTypeId, nullptr, toTypeId))
             return true;
     }
-    const QMetaType::ConverterFunction * const f =
+    const ConverterFunction * const f =
         customTypesConversionRegistry()->function(qMakePair(fromTypeId, toTypeId));
     if (f)
         return true;
 
-    if (fromType.flags() & QMetaType::IsEnumeration) {
-        if (toTypeId == QMetaType::QString || toTypeId == QMetaType::QByteArray)
+    if (toTypeId == QVariantList && hasRegisteredConverterFunction(
+                    fromTypeId, qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>()))
+        return true;
+
+    if ((toTypeId == QVariantHash || toTypeId == QVariantMap) && hasRegisteredConverterFunction(
+                    fromTypeId, qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>()))
+        return true;
+
+    if (toTypeId == QVariantPair && hasRegisteredConverterFunction(
+                    fromTypeId, qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>()))
+        return true;
+
+    if (fromType.flags() & IsEnumeration) {
+        if (toTypeId == QString || toTypeId == QByteArray)
             return true;
-        return QMetaType::canConvert(QMetaType(LongLong), toType);
+        return canConvert(QMetaType(LongLong), toType);
     }
-    if (toType.flags() & QMetaType::IsEnumeration) {
-        if (fromTypeId == QMetaType::QString || fromTypeId == QMetaType::QByteArray)
+    if (toType.flags() & IsEnumeration) {
+        if (fromTypeId == QString || fromTypeId == QByteArray)
             return true;
-        return QMetaType::canConvert(fromType, QMetaType(LongLong));
+        return canConvert(fromType, QMetaType(LongLong));
     }
-    if (toTypeId == Nullptr && fromType.flags() & QMetaType::IsPointer)
+    if (toTypeId == Nullptr && fromType.flags() & IsPointer)
         return true;
 #ifndef QT_BOOTSTRAPPED
     if (canConvertMetaObject(fromType, toType))
diff --git a/src/corelib/kernel/qmetatype.h b/src/corelib/kernel/qmetatype.h
index 4a3ed1affc..62d2fd82a1 100644
--- a/src/corelib/kernel/qmetatype.h
+++ b/src/corelib/kernel/qmetatype.h
@@ -162,6 +162,7 @@ inline constexpr int qMetaTypeId();
     F(QVariantMap, 8, QVariantMap) \
     F(QVariantList, 9, QVariantList) \
     F(QVariantHash, 28, QVariantHash) \
+    F(QVariantPair, 58, QVariantPair) \
     F(QByteArrayList, 49, QByteArrayList) \
 
 #if QT_CONFIG(shortcut)
@@ -219,6 +220,7 @@ inline constexpr int qMetaTypeId();
     F(QVariantList, -1, QVariantList, "QList<QVariant>") \
     F(QVariantMap, -1, QVariantMap, "QMap<QString,QVariant>") \
     F(QVariantHash, -1, QVariantHash, "QHash<QString,QVariant>") \
+    F(QVariantPair, -1, QVariantPair, "QPair<QVariant,QVariant>") \
     F(QByteArrayList, -1, QByteArrayList, "QList<QByteArray>") \
 
 #define QT_FOR_EACH_STATIC_TYPE(F)\
@@ -295,7 +297,7 @@ public:
         QT_FOR_EACH_STATIC_TYPE(QT_DEFINE_METATYPE_ID)
 
         FirstCoreType = Bool,
-        LastCoreType = Char32,
+        LastCoreType = QVariantPair,
         FirstGuiType = QFont,
         LastGuiType = QColorSpace,
         FirstWidgetsType = QSizePolicy,
@@ -337,7 +339,7 @@ public:
 
         // Widget types
         QSizePolicy = 121,
-        LastCoreType = QCborMap,
+        LastCoreType = Char32,
         LastGuiType = QColorSpace,
         User = 1024
     };
@@ -1704,6 +1706,7 @@ QT_FOR_EACH_STATIC_WIDGETS_CLASS(QT_FORWARD_DECLARE_STATIC_TYPES_ITER)
 typedef QList<QVariant> QVariantList;
 typedef QMap<QString, QVariant> QVariantMap;
 typedef QHash<QString, QVariant> QVariantHash;
+typedef QPair<QVariant, QVariant> QVariantPair;
 #ifdef Q_CLANG_QDOC
 class QByteArrayList;
 #else
diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index c16e4a0e06..6a046dffd3 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -1974,27 +1974,6 @@ bool QVariant::canConvert(int targetTypeId) const
     if (d.typeId() == targetTypeId && targetTypeId != QMetaType::UnknownType)
         return true;
 
-    if (targetTypeId == QMetaType::QVariantList
-        && (d.typeId() == QMetaType::QVariantList || d.typeId() == QMetaType::QStringList
-            || d.typeId() == QMetaType::QByteArrayList
-            || QMetaType::hasRegisteredConverterFunction(
-                    d.typeId(), qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>()))) {
-        return true;
-    }
-
-    if ((targetTypeId == QMetaType::QVariantHash || targetTypeId == QMetaType::QVariantMap)
-        && (d.typeId() == QMetaType::QVariantMap || d.typeId() == QMetaType::QVariantHash
-            || QMetaType::hasRegisteredConverterFunction(
-                    d.typeId(), qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>()))) {
-        return true;
-    }
-
-    if (targetTypeId == qMetaTypeId<QPair<QVariant, QVariant>>()
-        && QMetaType::hasRegisteredConverterFunction(
-                d.typeId(), qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>())) {
-        return true;
-    }
-
     return QMetaType::canConvert(d.type(), QMetaType(targetTypeId));
 }
 
diff --git a/src/corelib/kernel/qvariant.h b/src/corelib/kernel/qvariant.h
index 258dac3bbc..218b88cb4a 100644
--- a/src/corelib/kernel/qvariant.h
+++ b/src/corelib/kernel/qvariant.h
@@ -655,6 +655,7 @@ public:
     friend struct const_iterator;
 
     explicit QSequentialIterable(const QtMetaTypePrivate::QSequentialIterableImpl &impl);
+    QSequentialIterable() {}
 
     const_iterator begin() const;
     const_iterator end() const;
@@ -709,6 +710,7 @@ public:
     friend struct const_iterator;
 
     explicit QAssociativeIterable(const QtMetaTypePrivate::QAssociativeIterableImpl &impl);
+    QAssociativeIterable() {}
 
     const_iterator begin() const;
     const_iterator end() const;
@@ -748,122 +750,6 @@ namespace QtPrivate {
     struct QVariantValueHelperInterface : QVariantValueHelper<T>
     {
     };
-
-    template<>
-    struct QVariantValueHelperInterface<QSequentialIterable>
-    {
-        static QSequentialIterable invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-            if (typeId == qMetaTypeId<QVariantList>()) {
-                return QSequentialIterable(QtMetaTypePrivate::QSequentialIterableImpl(reinterpret_cast<const QVariantList*>(v.constData())));
-            }
-            if (typeId == qMetaTypeId<QStringList>()) {
-                return QSequentialIterable(QtMetaTypePrivate::QSequentialIterableImpl(reinterpret_cast<const QStringList*>(v.constData())));
-            }
-#ifndef QT_BOOTSTRAPPED
-            if (typeId == qMetaTypeId<QByteArrayList>()) {
-                return QSequentialIterable(QtMetaTypePrivate::QSequentialIterableImpl(reinterpret_cast<const QByteArrayList*>(v.constData())));
-            }
-#endif
-            return QSequentialIterable(qvariant_cast<QtMetaTypePrivate::QSequentialIterableImpl>(v));
-        }
-    };
-    template<>
-    struct QVariantValueHelperInterface<QAssociativeIterable>
-    {
-        static QAssociativeIterable invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-            if (typeId == qMetaTypeId<QVariantMap>()) {
-                return QAssociativeIterable(QtMetaTypePrivate::QAssociativeIterableImpl(reinterpret_cast<const QVariantMap*>(v.constData())));
-            }
-            if (typeId == qMetaTypeId<QVariantHash>()) {
-                return QAssociativeIterable(QtMetaTypePrivate::QAssociativeIterableImpl(reinterpret_cast<const QVariantHash*>(v.constData())));
-            }
-            return QAssociativeIterable(qvariant_cast<QtMetaTypePrivate::QAssociativeIterableImpl>(v));
-        }
-    };
-    template<>
-    struct QVariantValueHelperInterface<QVariantList>
-    {
-        static QVariantList invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-            if (typeId == qMetaTypeId<QStringList>() || typeId == qMetaTypeId<QByteArrayList>() ||
-                (QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>()) && !QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QVariantList>()))) {
-                QSequentialIterable iter = QVariantValueHelperInterface<QSequentialIterable>::invoke(v);
-                QVariantList l;
-                l.reserve(iter.size());
-                for (QSequentialIterable::const_iterator it = iter.begin(), end = iter.end(); it != end; ++it)
-                    l << *it;
-                return l;
-            }
-            return QVariantValueHelper<QVariantList>::invoke(v);
-        }
-    };
-    template<>
-    struct QVariantValueHelperInterface<QVariantHash>
-    {
-        static QVariantHash invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-            if (typeId == qMetaTypeId<QVariantMap>() || ((QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>())) && !QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QVariantHash>()))) {
-                QAssociativeIterable iter = QVariantValueHelperInterface<QAssociativeIterable>::invoke(v);
-                QVariantHash l;
-                l.reserve(iter.size());
-                for (QAssociativeIterable::const_iterator it = iter.begin(), end = iter.end(); it != end; ++it)
-                    l.insert(it.key().toString(), it.value());
-                return l;
-            }
-            return QVariantValueHelper<QVariantHash>::invoke(v);
-        }
-    };
-    template<>
-    struct QVariantValueHelperInterface<QVariantMap>
-    {
-        static QVariantMap invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-            if (typeId == qMetaTypeId<QVariantHash>() || (QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>()) && !QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QVariantMap>()))) {
-                QAssociativeIterable iter = QVariantValueHelperInterface<QAssociativeIterable>::invoke(v);
-                QVariantMap l;
-                for (QAssociativeIterable::const_iterator it = iter.begin(), end = iter.end(); it != end; ++it)
-                    l.insert(it.key().toString(), it.value());
-                return l;
-            }
-            return QVariantValueHelper<QVariantMap>::invoke(v);
-        }
-    };
-    template<>
-    struct QVariantValueHelperInterface<QPair<QVariant, QVariant> >
-    {
-        static QPair<QVariant, QVariant> invoke(const QVariant &v)
-        {
-            const int typeId = v.userType();
-
-            if (QMetaType::hasRegisteredConverterFunction(typeId, qMetaTypeId<QtMetaTypePrivate::QPairVariantInterfaceImpl>()) && !(typeId == qMetaTypeId<QPair<QVariant, QVariant> >())) {
-                QtMetaTypePrivate::QPairVariantInterfaceImpl pi = v.value<QtMetaTypePrivate::QPairVariantInterfaceImpl>();
-                QVariant v1(pi._metaType_first);
-                void *dataPtr;
-                if (pi._metaType_first == QMetaType::fromType<QVariant>())
-                    dataPtr = &v1;
-                else
-                    dataPtr = v1.data();
-                pi.first(dataPtr);
-
-                QVariant v2(pi._metaType_second);
-                if (pi._metaType_second == QMetaType::fromType<QVariant>())
-                    dataPtr = &v2;
-                else
-                    dataPtr = v2.data();
-                pi.second(dataPtr);
-
-                return QPair<QVariant, QVariant>(v1, v2);
-            }
-            return QVariantValueHelper<QPair<QVariant, QVariant> >::invoke(v);
-        }
-    };
 }
 
 template<typename T> inline T qvariant_cast(const QVariant &v)
diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.h b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.h
index 3f00db5519..43a099de17 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.h
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.h
@@ -121,6 +121,10 @@ template<> struct TestValueFactory<QMetaType::QVariantMap> {
 template<> struct TestValueFactory<QMetaType::QVariantHash> {
     static QVariantHash *create() { return new QVariantHash(); }
 };
+template<> struct TestValueFactory<QMetaType::QVariantPair> {
+    static QVariantPair *create() { return new QVariantPair(); }
+};
+
 template<> struct TestValueFactory<QMetaType::QVariantList> {
     static QVariantList *create() { return new QVariantList(QVariantList() << 123 << "Q" << "Variant" << "List"); }
 };