PyEnum: Prepare to support both implementations

The enum implementation should be switchable between the
old and the new version. This switching is possible only
before PySide import.

This patch prepares the switching capability for the
signature module and installs fields that will affect
the global header files.

The new version can be selected by setting the environment
variable

    PYSIDE63_OPTION_PYTHON_ENUM=1

or setting sys.pyside63_option_python_enum=1

[ChangeLog][PySide6] The signature module was prepared to support
both C++ enums and Python enums. This can be selected at startup.

Task-number: PYSIDE-1735
Pick-to: 6.3
Change-Id: I14999e1049fbaaccd00f00d1b7b1257bc9287255
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 12 insertions, 2 deletions

diff --git a/sources/shiboken6/ApiExtractor/abstractmetatype.cpp b/sources/shiboken6/ApiExtractor/abstractmetatype.cpp
index 78d07c6f9..d96c28ffe 100644
--- a/sources/shiboken6/ApiExtractor/abstractmetatype.cpp
+++ b/sources/shiboken6/ApiExtractor/abstractmetatype.cpp
@@ -32,6 +32,8 @@
 #include "messages.h"
 #include "typedatabase.h"
 #include "containertypeentry.h"
+#include "enumtypeentry.h"
+#include "flagstypeentry.h"
 #include "parser/codemodel.h"
 
 #include "qtcompat.h"
@@ -668,8 +670,16 @@ QString AbstractMetaTypeData::formatPythonSignature() const
             result += TypeInfo::indirectionKeyword(i);
     // If it is a flags type, we replace it with the full name:
     // "PySide6.QtCore.Qt.ItemFlags" instead of "PySide6.QtCore.QFlags<Qt.ItemFlag>"
-    if (m_typeEntry->isFlags())
-        result = m_typeEntry->qualifiedTargetLangName();
+    if (m_typeEntry->isFlags()) {
+        // PYSIDE-1735: We need to provide both the flags type and the original enum type
+        //              as a choice at runtime.
+        auto flagsTypeEntry = static_cast<const FlagsTypeEntry *>(m_typeEntry);
+        auto enumTypeEntry = flagsTypeEntry->originator();
+        result = m_typeEntry->targetLangPackage() + u".^^"_s
+               + flagsTypeEntry->targetLangName() + u"^^"_s
+               + enumTypeEntry->targetLangName() + u"^^"_s;
+    }
+
     result.replace(u"::"_s, u"."_s);
     return result;
 }