Commit d96d89c6 authored by Kent Hansen's avatar Kent Hansen Committed by Qt by Nokia

Make QVariant conversion for JS null type symmetric

If you pass (void*)0 to QJSEngine::toScriptValue(), or you pass a
QVariant of type QMetaType::VoidStar containing a 0 value, you get
back a QJSValue of type null (isNull() returns true); that's fine.

However, if you called QJSValue::toVariant() on a JS null value, you
would get back an invalid QVariant. The expected result is a
QVariant of type QMetaType::VoidStar containing a 0 value. This
makes the conversion of the JS null type symmetric and avoids loss
of data.

Change-Id: Ifa6e788152118f80adf9c2d7be1283f053b44294
Reviewed-by: 's avatarJędrzej Nowacki <>
Reviewed-by: 's avatarSimon Hausmann <>
parent d38e9e41
......@@ -428,7 +428,7 @@ quint32 QJSValue::toUInt() const
\header \li Input Type \li Result
\row \li Undefined \li An invalid QVariant.
\row \li Null \li An invalid QVariant.
\row \li Null \li A QVariant containing a null pointer (QMetaType::VoidStar).
\row \li Boolean \li A QVariant containing the value of the boolean.
\row \li Number \li A QVariant containing the value of the number.
\row \li String \li A QVariant containing the value of the string.
......@@ -281,7 +281,7 @@ QVariant QJSValuePrivate::toVariant() const
case CNumber:
return QVariant(u.m_number);
case CNull:
return QVariant();
return QVariant(QMetaType::VoidStar, 0);
case CUndefined:
return QVariant();
case JSValue:
......@@ -1365,7 +1365,8 @@ v8::Handle<v8::Value> QV8Engine::variantToJS(const QVariant &value)
// Converts a JS value to a QVariant.
// Null, Undefined -> QVariant() (invalid)
// Undefined -> QVariant() (invalid)
// Null -> QVariant((void*)0)
// Boolean -> QVariant(bool)
// Number -> QVariant(double)
// String -> QVariant(QString)
......@@ -1376,8 +1377,10 @@ v8::Handle<v8::Value> QV8Engine::variantToJS(const QVariant &value)
QVariant QV8Engine::variantFromJS(v8::Handle<v8::Value> value)
if (value->IsNull() || value->IsUndefined())
if (value->IsUndefined())
return QVariant();
if (value->IsNull())
return QVariant(QMetaType::VoidStar, 0);
if (value->IsBoolean())
return value->ToBoolean()->Value();
if (value->IsInt32())
......@@ -2369,6 +2369,8 @@ void tst_QJSEngine::valueConversion_basic()
QCOMPARE(eng.fromScriptValue<QChar>(code), c);
QCOMPARE(eng.fromScriptValue<QChar>(eng.toScriptValue(c)), c);
QVERIFY(eng.toScriptValue(static_cast<void *>(0)).isNull());
#if 0 // FIXME: No API for custom types
......@@ -2588,6 +2590,8 @@ void tst_QJSEngine::valueConversion_QVariant()
QCOMPARE(qjsvalue_cast<QVariant>(QJSValue(123)), QVariant(123));
QVERIFY(eng.toScriptValue(QVariant(QMetaType::VoidStar, 0)).isNull());
#if 0 // FIXME: No support for custom types
......@@ -993,8 +993,8 @@ void tst_QJSValue::toVariant()
QCOMPARE(qjsvalue_cast<QVariant>(undefined), QVariant());
QJSValue null = eng.evaluate("null");
QCOMPARE(null.toVariant(), QVariant());
QCOMPARE(qjsvalue_cast<QVariant>(null), QVariant());
QCOMPARE(null.toVariant(), QVariant(QMetaType::VoidStar, 0));
QCOMPARE(qjsvalue_cast<QVariant>(null), QVariant(QMetaType::VoidStar, 0));
QJSValue number = eng.toScriptValue(123.0);
......@@ -1064,6 +1064,14 @@ void tst_QJSValue::toVariant()
QJSValue str = QJSValue(QString("ciao"));
QCOMPARE(str.toVariant(), QVariant(QString("ciao")));
QCOMPARE(qjsvalue_cast<QVariant>(str), QVariant(QString("ciao")));
QJSValue undef = QJSValue(QJSValue::UndefinedValue);
QCOMPARE(undef.toVariant(), QVariant());
QCOMPARE(qjsvalue_cast<QVariant>(undef), QVariant());
QJSValue nil = QJSValue(QJSValue::NullValue);
QCOMPARE(nil.toVariant(), QVariant(QMetaType::VoidStar, 0));
QCOMPARE(qjsvalue_cast<QVariant>(nil), QVariant(QMetaType::VoidStar, 0));
#if 0 // FIXME: No automatic sequence conversion
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