2 files changed, 84 insertions, 3 deletions
diff --git a/sources/pyside6/doc/inheritance_diagram.py b/sources/pyside6/doc/inheritance_diagram.py
index 45f7f77cf..22d7d87ad 100644
--- a/sources/pyside6/doc/inheritance_diagram.py
+++ b/sources/pyside6/doc/inheritance_diagram.py
@@ -50,6 +50,8 @@ from sphinx.ext.graphviz import render_dot_html, render_dot_latex
 
 from import_inheritance import (get_inheritance_entries_by_import,
                                 InheritanceException)
+from json_inheritance import (is_inheritance_from_json_enabled,
+                              get_inheritance_entries_from_json)
 
 
 class InheritanceGraph(object):
@@ -66,9 +68,14 @@ class InheritanceGraph(object):
         in the graph.
         """
         self.class_names = class_names
-        self.class_info = get_inheritance_entries_by_import(class_names, currmodule,
-                                                            __builtins__, show_builtins,
-                                                            parts)
+        if is_inheritance_from_json_enabled():
+            self.class_info = get_inheritance_entries_from_json(class_names)
+        else:
+            self.class_info = get_inheritance_entries_by_import(class_names,
+                                                                currmodule,
+                                                                __builtins__,
+                                                                show_builtins,
+                                                                parts)
 
     def get_all_class_names(self):
         """
diff --git a/sources/pyside6/doc/json_inheritance.py b/sources/pyside6/doc/json_inheritance.py
new file mode 100644
index 000000000..06be33ea4
--- /dev/null
+++ b/sources/pyside6/doc/json_inheritance.py
@@ -0,0 +1,74 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+import json
+import os
+import sys
+from pathlib import Path
+
+
+"""Helpers for determining base classes by reading a JSON
+    file written by shiboken's doc generator."""
+
+
+TEST_DRIVER_USAGE = """Usage: json_inheritance.py class_name json_file
+
+Example:
+python json_inheritance.py PySide6.QtWidgets.QWizard ~/inheritance.json
+"""
+
+
+ENV_VAR = "INHERITANCE_FILE"
+
+
+def strip_module(class_name):
+    return class_name[8:] if class_name.startswith("PySide") else class_name
+
+
+def get_inheritance_entries_recursion(json_dict, class_name):
+    """Get all edges of the inheritance graph of class_name."""
+    result = []
+    bases_entry = json_dict.get(class_name)
+    bases = bases_entry if bases_entry else []
+    node_name = strip_module(class_name)
+    base_list = [strip_module(b) for b in bases]
+    result.append((node_name, class_name, base_list))
+    for b in bases:
+        nested_bases = get_inheritance_entries_recursion(json_dict, b)
+        if nested_bases:
+            result.extend(nested_bases)
+    return result
+
+
+def _get_inheritance_entries_from_json(json_file, class_names):
+    """Get all edges of the inheritance graph of class_name
+       from the JSON file generated by shiboken."""
+    result = []
+    try:
+        with Path(json_file).open("r") as f:
+            json_dict = json.load(f)
+            for c in class_names:
+                result.extend(get_inheritance_entries_recursion(json_dict, c))
+    except (json.JSONDecodeError, KeyError) as e:
+        print(f"Error reading {json_file}: {e}")
+        raise
+    return result
+
+
+def is_inheritance_from_json_enabled():
+    return os.environ.get(ENV_VAR)
+
+
+def get_inheritance_entries_from_json(class_names):
+    json_file = os.environ[ENV_VAR]
+    return _get_inheritance_entries_from_json(json_file, class_names)
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print(TEST_DRIVER_USAGE)
+        sys.exit(-1)
+    class_name = sys.argv[1]
+    json_file = sys.argv[2]
+    for e in _get_inheritance_entries_from_json(json_file, [class_name]):
+        print(e)