moc: support nested q_namespaces

Nested namespaces are quite common, therefore moc should support them.

Task-number: QTBUG-55415
Change-Id: I756cab36d498eb4342b402d255836d5d30f07b30
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

4 files changed, 181 insertions, 7 deletions

diff --git a/src/tools/moc/moc.cpp b/src/tools/moc/moc.cpp
index e4b9b19758..3bd87e1f01 100644
--- a/src/tools/moc/moc.cpp
+++ b/src/tools/moc/moc.cpp
@@ -538,7 +538,6 @@ bool Moc::parseMaybeFunction(const ClassDef *cdef, FunctionDef *def)
     return true;
 }
 
-
 void Moc::parse()
 {
     QVector<NamespaceDef> namespaceList;
@@ -560,9 +559,27 @@ void Moc::parse()
                         until(RBRACE);
                         def.end = index;
                         index = def.begin + 1;
+
                         const bool parseNamespace = currentFilenames.size() <= 1;
+                        if (parseNamespace) {
+                            for (int i = namespaceList.size() - 1; i >= 0; --i) {
+                                if (inNamespace(&namespaceList.at(i))) {
+                                    def.qualified.prepend(namespaceList.at(i).classname + "::");
+                                }
+                            }
+                        }
                         while (parseNamespace && inNamespace(&def) && hasNext()) {
                             switch (next()) {
+                            case NAMESPACE:
+                                if (test(IDENTIFIER)) {
+                                    if (test(EQ)) {
+                                        // namespace Foo = Bar::Baz;
+                                        until(SEMIC);
+                                    } else if (!test(SEMIC)) {
+                                        until(RBRACE);
+                                    }
+                                }
+                                break;
                             case Q_NAMESPACE_TOKEN:
                                 def.hasQNamespace = true;
                                 break;
@@ -857,13 +874,22 @@ void Moc::parse()
             continue;
         ClassDef def;
         static_cast<BaseDef &>(def) = static_cast<BaseDef>(n);
-        if (!def.qualified.isEmpty())
-            def.qualified += "::";
         def.qualified += def.classname;
         def.hasQGadget = true;
-        classList += def;
-        knownGadgets.insert(def.classname, def.qualified);
-        knownGadgets.insert(def.qualified, def.qualified);
+        auto it = std::find_if(classList.begin(), classList.end(), [&def](const ClassDef &val) {
+            return def.classname == val.classname && def.qualified == val.qualified;
+        });
+
+        if (it != classList.end()) {
+            it->classInfoList += def.classInfoList;
+            it->enumDeclarations.unite(def.enumDeclarations);
+            it->enumList += def.enumList;
+            it->flagAliases.unite(def.flagAliases);
+        } else {
+            knownGadgets.insert(def.classname, def.qualified);
+            knownGadgets.insert(def.qualified, def.qualified);
+            classList += def;
+        }
     }
 }
 
diff --git a/tests/auto/tools/moc/namespace.h b/tests/auto/tools/moc/namespace.h
index 2bb1d8e958..6e04831589 100644
--- a/tests/auto/tools/moc/namespace.h
+++ b/tests/auto/tools/moc/namespace.h
@@ -1,7 +1,77 @@
-#pragma once
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef NAMESPACE_H
+#define NAMESPACE_H
 
 #include <QObject>
 
+#include "namespace_no_merge.h"
+// moc should not merge namespace_no_merge.h content with this one !
+
 namespace FooNamespace {
     Q_NAMESPACE
+    enum class Enum1 {
+        Key1,
+        Key2
+    };
+    Q_ENUM_NS(Enum1)
+
+    namespace FooNestedNamespace {
+        Q_NAMESPACE
+        enum class Enum2 {
+            Key3,
+            Key4
+        };
+        Q_ENUM_NS(Enum2)
+    }
+
+    using namespace FooNamespace;
+    namespace Bar = FooNamespace;
+
+    // Moc should merge this namespace with the previous one
+    namespace FooNestedNamespace {
+        Q_NAMESPACE
+        enum class Enum3 {
+            Key5,
+            Key6
+        };
+        Q_ENUM_NS(Enum3)
+
+        namespace FooMoreNestedNamespace {
+            Q_NAMESPACE
+            enum class Enum4 {
+                Key7,
+                Key8
+            };
+            Q_ENUM_NS(Enum4)
+        }
+    }
 }
+
+#endif // NAMESPACE_H
diff --git a/tests/auto/tools/moc/namespace_no_merge.h b/tests/auto/tools/moc/namespace_no_merge.h
new file mode 100644
index 0000000000..8d1639ad4c
--- /dev/null
+++ b/tests/auto/tools/moc/namespace_no_merge.h
@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef NAMESPACE_NO_MERGE_H
+#define NAMESPACE_NO_MERGE_H
+
+#include <QObject>
+
+namespace FooNamespace {
+    Q_NAMESPACE
+    enum class MEnum1 {
+        Key1,
+        Key2
+    };
+    Q_ENUM_NS(MEnum1)
+
+    namespace FooNestedNamespace {
+        Q_NAMESPACE
+        enum class MEnum2 {
+            Key3,
+            Key4
+        };
+        Q_ENUM_NS(MEnum2)
+    }
+
+    using namespace FooNamespace;
+    namespace Bar = FooNamespace;
+
+    // Moc should merge this namespace with the previous one
+    namespace FooNestedNamespace {
+        Q_NAMESPACE
+        enum class MEnum3 {
+            Key5,
+            Key6
+        };
+        Q_ENUM_NS(MEnum3)
+
+        namespace FooMoreNestedNamespace {
+            Q_NAMESPACE
+            enum class MEnum4 {
+                Key7,
+                Key8
+            };
+            Q_ENUM_NS(MEnum4)
+        }
+    }
+}
+
+#endif // NAMESPACE_NO_MERGE_H
diff --git a/tests/auto/tools/moc/tst_moc.cpp b/tests/auto/tools/moc/tst_moc.cpp
index 601b1bb36b..ecf6c7e992 100644
--- a/tests/auto/tools/moc/tst_moc.cpp
+++ b/tests/auto/tools/moc/tst_moc.cpp
@@ -3777,6 +3777,10 @@ void tst_Moc::testQNamespace()
     QCOMPARE(meta.name(), "TestEnum1");
     QCOMPARE(meta.enclosingMetaObject(), &TestQNamespace::staticMetaObject);
     QCOMPARE(meta.keyCount(), 2);
+
+    QCOMPARE(FooNamespace::staticMetaObject.enumeratorCount(), 1);
+    QCOMPARE(FooNamespace::FooNestedNamespace::staticMetaObject.enumeratorCount(), 2);
+    QCOMPARE(FooNamespace::FooNestedNamespace::FooMoreNestedNamespace::staticMetaObject.enumeratorCount(), 1);
 }
 
 QTEST_MAIN(tst_Moc)