__feature__: provide useful error message when feature is active

Features seem to work quite good so far, but they clearly need
much more testing.

One of the problems is that error messages are produced,
but the function name is not found and we get an ugly default
error message.

This is an efficient implementation that does all name mangling
in the C code. A helper dict avoids linear search for properties.

Task-number: PYSIDE-1019
Change-Id: Ic87c4a6e7dc2b2a251e809d6df0eb7fb9ca8021c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 4 insertions, 10 deletions

diff --git a/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py b/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
index 264700ffa..7083fd1e6 100644
--- a/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
+++ b/sources/shiboken6/shibokenmodule/files.dir/shibokensupport/signature/errorhandler.py
@@ -61,11 +61,6 @@ from shibokensupport.signature import get_signature
 from shibokensupport.signature.mapping import update_mapping, namespace
 from textwrap import dedent
 
-try:
-    import PySide6
-except ImportError:
-    pass
-
 
 def qt_isinstance(inst, the_type):
     if the_type == float:
@@ -99,16 +94,15 @@ def matched_type(args, sigs):
 
 
 def seterror_argument(args, func_name):
-    update_mapping()
     func = None
     try:
         func = eval(func_name, namespace)
     except Exception as e:
-        msg = f"Internal error evaluating {func_name}: {e}"
+        msg = f"Internal error evaluating {func_name}: " + str(e)
         return TypeError, msg
     sigs = get_signature(func, "typeerror")
     if not sigs:
-        msg = f"Missing signature: {func_name}({args})"
+        msg = f"{func_name}({args} is wrong (missing signature)"
         return TypeError, msg
     if type(sigs) != list:
         sigs = [sigs]
@@ -118,7 +112,7 @@ def seterror_argument(args, func_name):
     found = matched_type(args, sigs)
     if found:
         msg = dedent(f"""
-            '{func_name}' called with wrong argument values:
+            {func_name!r} called with wrong argument values:
               {func_name}{args}
             Found signature:
               {func_name}{found}
@@ -126,7 +120,7 @@ def seterror_argument(args, func_name):
         return ValueError, msg
     type_str = ", ".join(type(arg).__name__ for arg in args)
     msg = dedent(f"""
-        '{func_name}' called with wrong argument types:
+        {func_name!r} called with wrong argument types:
           {func_name}({type_str})
         Supported signatures:
         """).strip()