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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: Jędrzej Nowacki <jedrzej.nowacki@nokia.com>
Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>
This commit is contained in:
Kent Hansen 2012-03-15 10:15:53 +01:00 committed by Qt by Nokia
parent d38e9e413c
commit d96d89c63c
5 changed files with 21 additions and 6 deletions
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2
src/qml/qml/v8/qjsvalue.cpp
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@ -428,7 +428,7 @@ quint32 QJSValue::toUInt() const
\table
\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.

2
src/qml/qml/v8/qjsvalue_impl_p.h
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@ -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:

7
src/qml/qml/v8/qv8engine.cpp
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@ -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)
{
Q_ASSERT(!value.IsEmpty());
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())

4
tests/auto/qml/qjsengine/tst_qjsengine.cpp
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@ -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

12
tests/auto/qml/qjsvalue/tst_qjsvalue.cpp
View File

@ -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