Add support for QSequentialIterable in QML

That means that now QML understand many sequential value types
and it is able to convert it to a JS array.

Fixes: QTBUG-60338
Change-Id: I46943b7c130296bb64c23008ce2e52a55d7f019d
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index 8f64c84eae..f90a693265 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -1540,6 +1540,22 @@ static QV4::ReturnedValue variantListToJS(QV4::ExecutionEngine *v4, const QVaria
     return a.asReturnedValue();
 }
 
+// Converts a QSequentialIterable to JS.
+// The result is a new Array object with length equal to the length
+// of the QSequentialIterable, and the elements being the QSequentialIterable's
+// elements converted to JS, recursively.
+static QV4::ReturnedValue sequentialIterableToJS(QV4::ExecutionEngine *v4, const QSequentialIterable &lst)
+{
+    QV4::Scope scope(v4);
+    QV4::ScopedArrayObject a(scope, v4->newArrayObject());
+    a->arrayReserve(lst.size());
+    QV4::ScopedValue v(scope);
+    for (int i = 0; i < lst.size(); i++)
+        a->arrayPut(i, (v = variantToJS(v4, lst.at(i))));
+    a->setArrayLengthUnchecked(lst.size());
+    return a.asReturnedValue();
+}
+
 // Converts a QVariantMap to JS.
 // The result is a new Object object with property names being
 // the keys of the QVariantMap, and values being the values of
@@ -1648,6 +1664,11 @@ QV4::ReturnedValue ExecutionEngine::metaTypeToJS(int type, const void *data)
                 Q_ASSERT(mt.metaObject());
                 return QV4::QQmlValueTypeWrapper::create(this, QVariant(type, data), mt.metaObject(), type);
             }
+            if (QMetaType::hasRegisteredConverterFunction(type, qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>())) {
+                auto v = QVariant(type, data);
+                QSequentialIterable lst = v.value<QSequentialIterable>();
+                return sequentialIterableToJS(this, lst);
+            }
             // Fall back to wrapping in a QVariant.
             return QV4::Encode(newVariantObject(QVariant(type, data)));
         }