1 files changed, 120 insertions, 0 deletions
diff --git a/sources/shiboken6/generator/defaultvalue.cpp b/sources/shiboken6/generator/defaultvalue.cpp
new file mode 100644
index 000000000..89cc9fa77
--- /dev/null
+++ b/sources/shiboken6/generator/defaultvalue.cpp
@@ -0,0 +1,120 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "defaultvalue.h"
+
+#include "qtcompat.h"
+
+#include <QtCore/QDebug>
+
+using namespace Qt::StringLiterals;
+
+// DefaultValue is used for storing default values of types for which code is
+// generated in different contexts:
+//
+// Context             | Example: "Class *"            | Example: "Class" with default Constructor
+// --------------------+-------------------------------+------------------------------------------
+// Variable            |  var{nullptr};                | var;
+// initializations     |                               |
+// --------------------+-------------------------------+------------------------------------------
+// Return values       | return nullptr;               | return {}
+// --------------------+-------------------------------+------------------------------------------
+// constructor         | static_cast<Class *>(nullptr) | Class()
+// arguments lists     |                               |
+// (recursive, precise |                               |
+// matching).          |                               |
+
+DefaultValue::DefaultValue(Type t, QString value) :
+    m_type(t), m_value(std::move(value))
+{
+}
+
+DefaultValue::DefaultValue(QString customValue) :
+    m_type(Custom), m_value(std::move(customValue))
+{
+}
+
+QString DefaultValue::returnValue() const
+{
+    switch (m_type) {
+    case DefaultValue::Boolean:
+        return u"false"_s;
+    case DefaultValue::CppScalar:
+        return u"0"_s;
+    case DefaultValue::Custom:
+    case DefaultValue::Enum:
+        return m_value;
+    case DefaultValue::Pointer:
+        return u"nullptr"_s;
+    case DefaultValue::Void:
+        return {};
+    case DefaultValue::DefaultConstructorWithDefaultValues:
+        return m_value + u"()"_s;
+    case DefaultValue::DefaultConstructor:
+        break;
+    }
+    return u"{}"_s;
+}
+
+QString DefaultValue::initialization() const
+{
+    switch (m_type) {
+    case DefaultValue::Boolean:
+        return u"{false}"_s;
+    case DefaultValue::CppScalar:
+        return u"{0}"_s;
+    case DefaultValue::Custom:
+        return u" = "_s + m_value;
+    case DefaultValue::Enum:
+        return u'{' + m_value + u'}';
+    case DefaultValue::Pointer:
+        return u"{nullptr}"_s;
+    case DefaultValue::Void:
+        Q_ASSERT(false);
+        break;
+    case DefaultValue::DefaultConstructor:
+    case DefaultValue::DefaultConstructorWithDefaultValues:
+        break;
+    }
+    return {};
+}
+
+QString DefaultValue::constructorParameter() const
+{
+    switch (m_type) {
+    case DefaultValue::Boolean:
+        return u"false"_s;
+    case DefaultValue::CppScalar: {
+        // PYSIDE-846: Use static_cast in case of "unsigned long" and similar
+        const QString cast = m_value.contains(u' ')
+            ? u"static_cast<"_s + m_value + u'>'
+            : m_value;
+        return cast + u"(0)"_s;
+    }
+    case DefaultValue::Custom:
+    case DefaultValue::Enum:
+        return m_value;
+    case DefaultValue::Pointer:
+        // Be precise here to be able to differentiate between constructors
+        // taking different pointer types, cf
+        // QTreeWidgetItemIterator(QTreeWidget *) and
+        // QTreeWidgetItemIterator(QTreeWidgetItemIterator *).
+        return u"static_cast<"_s + m_value + u"*>(nullptr)"_s;
+    case DefaultValue::Void:
+        Q_ASSERT(false);
+        break;
+    case DefaultValue::DefaultConstructor:
+    case DefaultValue::DefaultConstructorWithDefaultValues:
+        break;
+    }
+    return m_value + u"()"_s;
+}
+
+QDebug operator<<(QDebug debug, const DefaultValue &v)
+{
+    QDebugStateSaver saver(debug);
+    debug.noquote();
+    debug.nospace();
+    debug << "DefaultValue(" <<  v.type() << ", \"" << v.value() << "\")";
+    return debug;
+}