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/*
enumutil.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2016 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Volker Krause <volker.krause@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include "enumutil.h"
#include "enumrepositoryserver.h"
#include <QDebug>
#include <QMetaEnum>
using namespace GammaRay;
static const QMetaObject *metaObjectForClass(const QByteArray &name)
{
if (name.isEmpty())
return nullptr;
auto mo = QMetaType::fromName(name).metaObject();
// auto mo = QMetaType::metaObjectForType(QMetaType::type(name));
if (mo)
return mo;
mo = QMetaType::fromName(name + '*').metaObject(); // try pointer version, more likely for QObjects
return mo;
}
static QMetaEnum flagsFromEnumIndex(int enumIndex, const QByteArray &enumName, const QMetaObject *const mo)
{
Q_ASSERT(mo);
// usually it should be just enumIndex + 1
const auto count = mo->enumeratorCount();
if (enumIndex + 1 < count) {
const QMetaEnum me = mo->enumerator(enumIndex + 1);
if (me.isFlag() && enumName == me.enumName()) {
return me;
}
}
for (int i = mo->enumeratorOffset(); i < count; ++i) {
const QMetaEnum me = mo->enumerator(i);
if (me.isFlag() && enumName == me.enumName()) {
return me;
}
}
return mo->enumerator(enumIndex);
}
QMetaEnum EnumUtil::metaEnum(const QVariant &value, const char *typeName, const QMetaObject *metaObject)
{
QByteArray fullTypeName(typeName);
if (fullTypeName.isEmpty())
fullTypeName = value.typeName();
// split class name and enum name
QByteArray className;
QByteArray enumTypeName(fullTypeName);
const int pos = enumTypeName.lastIndexOf("::");
bool isFlag = false;
if (pos >= 0) {
className = enumTypeName.left(pos);
enumTypeName = enumTypeName.mid(pos + 2);
// QVariant::typeName is no longer the flag name, but QFlags<Foo>...
if (className.startsWith("QFlags<")) {
className.remove(0, sizeof("QFlags<") - 1);
isFlag = true;
}
if (enumTypeName.endsWith(">")) {
enumTypeName.chop(1);
}
}
const QMetaObject *mo = &Qt::staticMetaObject;
int enumIndex = mo->indexOfEnumerator(enumTypeName);
if (enumIndex < 0 && metaObject) {
mo = metaObject;
enumIndex = mo->indexOfEnumerator(enumTypeName);
}
if (enumIndex < 0 && (mo = QMetaType::fromName(fullTypeName).metaObject())) {
enumIndex = mo->indexOfEnumerator(enumTypeName);
}
if (enumIndex < 0 && (mo = metaObjectForClass(className))) {
enumIndex = mo->indexOfEnumerator(enumTypeName);
}
// attempt to recover namespaces from semi-qualified type names
if (enumIndex < 0 && metaObject) {
QByteArray n(metaObject->className());
const int pos = n.lastIndexOf("::");
if (pos > 0) {
n = n.left(pos + 2) + fullTypeName;
return metaEnum(value, n, nullptr);
}
}
if (enumIndex < 0)
return {};
if (isFlag) {
return flagsFromEnumIndex(enumIndex, enumTypeName, mo);
}
return mo->enumerator(enumIndex);
}
int EnumUtil::enumToInt(const QVariant &value, const QMetaEnum &metaEnum)
{
// QVariant has no implicit QFlag to int conversion as of Qt 5.7
if (metaEnum.isFlag() && QMetaType(value.userType()).sizeOf() == sizeof(int)) // int should be enough, QFlag has that hardcoded
return value.constData() ? *static_cast<const int *>(value.constData()) : 0;
return value.toInt();
}
QString EnumUtil::enumToString(const QVariant &value, const char *typeName, const QMetaObject *metaObject)
{
const auto me = metaEnum(value, typeName, metaObject);
if (me.isValid()) {
if (me.isFlag()) {
return QString::fromUtf8(me.valueToKeys(enumToInt(value, me)));
} else {
return QString::fromUtf8(me.valueToKey(enumToInt(value, me)));
}
}
if (EnumRepositoryServer::isEnum(value.userType())) {
const auto ev = EnumRepositoryServer::valueFromVariant(value);
const auto def = EnumRepositoryServer::definitionForId(ev.id());
return def.valueToString(ev);
}
return QString();
}
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