QmlDesigner: Add singleton support to QmlDocumentParser

Task-number: QDS-13602
Change-Id: I0af54c5949b20e840c0b07f13ec213db8dc40d7e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/libs/designercore/projectstorage/qmldocumentparser.cpp

@@ -30,6 +30,8 @@ using Tracer = ProjectStorageTracing::Category::TracerType;
 namespace QmlDom = QQmlJS::Dom;
 namespace Synchronization = Storage::Synchronization;
 
+using namespace Qt::StringLiterals;
+
 namespace {
 
 using QualifiedImports = std::map<QString, Storage::Import>;
@@ -297,12 +299,21 @@ void addEnumeraton(Storage::Synchronization::Type &type, const QmlDom::Component
     }
 }
 
-Storage::TypeTraits createTypeTraits()
+bool isSingleton(const QmlDom::QmlFile *qmlFile)
+{
+    const auto &pragmas = qmlFile->pragmas();
+
+    return std::ranges::find(pragmas, "Singleton"_L1, &QQmlJS::Dom::Pragma::name) != pragmas.end();
+}
+
+Storage::TypeTraits createTypeTraits(const QmlDom::QmlFile *qmlFile)
 {
     Storage::TypeTraits traits = Storage::TypeTraitsKind::Reference;
 
     traits.isFileComponent = true;
 
+    traits.isSingleton = isSingleton(qmlFile);
+
     return traits;
 }
 
@@ -353,7 +364,7 @@ Storage::Synchronization::Type QmlDocumentParser::parse(const QString &sourceCon
     QmlDom::DomItem file = items.field(QmlDom::Fields::currentItem);
     const QmlDom::QmlFile *qmlFile = file.as<QmlDom::QmlFile>();
     const auto &components = qmlFile->components();
-
+    qmlFile->pragmas();
     if (components.empty())
         return type;
 
@@ -372,7 +383,7 @@ Storage::Synchronization::Type QmlDocumentParser::parse(const QString &sourceCon
                                                          directoryPath,
                                                          m_storage);
 
-    type.traits = createTypeTraits();
+    type.traits = createTypeTraits(qmlFile);
     type.prototype = createImportedTypeName(qmlObject.name(), qualifiedImports);
     type.defaultPropertyName = qmlObject.localDefaultPropertyName();
     addImports(imports, qmlFile->imports(), sourceId, directoryPath, m_storage);

tests/unit/tests/unittests/projectstorage/qmldocumentparser-test.cpp

@@ -543,4 +543,25 @@ TEST_F(QmlDocumentParser, has_is_reference_trait)
     ASSERT_THAT(type.traits.kind, QmlDesigner::Storage::TypeTraitsKind::Reference);
 }
 
+TEST_F(QmlDocumentParser, is_singleton)
+{
+    QString component = R"(pragma Singleton
+                           Item{
+                           })";
+
+    auto type = parser.parse(component, imports, qmlFileSourceId, directoryPath);
+
+    ASSERT_TRUE(type.traits.isSingleton);
+}
+
+TEST_F(QmlDocumentParser, is_not_singleton)
+{
+    QString component = R"(Item{
+                           })";
+
+    auto type = parser.parse(component, imports, qmlFileSourceId, directoryPath);
+
+    ASSERT_FALSE(type.traits.isSingleton);
+}
+
 } // namespace