Add dunder methods, hidden type discovery, uniform_float override, and docstring fixes

- Introspect dunder methods (__getitem__, __len__, __add__, __matmul__, etc.)
  on C extension classes with runtime probing for return types
- Discover hidden C types from property values (e.g. MatrixAccess from Matrix.col)
- Add gpu.types override for uniform_float to accept Matrix, Vector, Euler,
  Quaternion, and Color (matching Blender's mathutils_array_parse C implementation)
- Extend apply_overrides to support ClassName.method_name keys for struct methods
- Parse standalone :type: annotations in property docstrings (is_frozen -> bool)
- Strip (readonly) and (never None) from docstring type annotations
- Add :raises to directive lookahead to prevent rtype bleeding into raises text
- Fix NoneType -> None normalization in runtime type probing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -56,7 +56,9 @@ gpu.state.blend_set('ALPHA')
 - **Literal enum types** — string parameters like `gpu.state.blend_set(mode)` use `Literal["NONE", "ALPHA", ...]` instead of plain `str`
 - **Docstrings** — inline documentation on properties, methods, and functions
 - **Classmethod detection** — `Matrix.Identity()`, `Vector.Fill()`, etc. correctly typed as `@classmethod`
+- **Dunder methods** — `__getitem__`, `__len__`, `__add__`, `__matmul__`, and other operators introspected with correct return types (e.g. `Matrix[0]` returns `Vector`)
 - **Operator metadata** — `bpy.ops.mesh.primitive_cube_add.poll()`, `.idname()`, `.get_rna_type()`, and `.bl_options` are typed via introspected `_BPyOpsSubModOp` wrapper
+- **GPU uniform types** — `shader.uniform_float()` accepts `Matrix`, `Vector`, `Euler`, `Quaternion`, and `Color` in addition to `float | Sequence[float]`, matching the C implementation
 - **Dynamic array types** — `Image.pixels` typed as `bpy_prop_array[float]` (not `list[float]` or `float`)
 - **Zero `Any` usage** — precise types throughout, no `typing.Any` fallbacks
 - **basedpyright strict mode** — 0 errors on generated stubs (4.1+)

generate_stubs.py

@@ -760,18 +760,38 @@ def load_overrides(overrides_dir: str, module_name: str) -> dict[str, ParamOverr
     return {}
 
 
+def _apply_func_overrides(
+    func: FunctionData, func_overrides: ParamOverrides
+) -> None:
+    """Apply overrides to a single function/method."""
+    param_overrides = func_overrides.get("params", {})
+    for param in func["params"]:
+        if param["name"] in param_overrides:
+            param["type"] = param_overrides[param["name"]]
+    if "return_type" in func_overrides:
+        func["return_type"] = func_overrides["return_type"]
+
+
 def apply_overrides(
     module_data: ModuleData, overrides: dict[str, ParamOverrides]
 ) -> ModuleData:
-    """Apply type overrides to introspected module data."""
+    """Apply type overrides to introspected module data.
+
+    Keys can be function names (e.g. ``"my_func"``) for module-level functions,
+    or ``"ClassName.method_name"`` for struct methods.
+    """
     for func in module_data["functions"]:
         func_overrides = overrides.get(func["name"], {})
-        param_overrides = func_overrides.get("params", {})
+        if func_overrides:
-        for param in func["params"]:
+            _apply_func_overrides(func, func_overrides)
-            if param["name"] in param_overrides:
+
-                param["type"] = param_overrides[param["name"]]
+    for struct in module_data.get("structs", []):
-        if "return_type" in func_overrides:
+        for method in struct["methods"]:
-            func["return_type"] = func_overrides["return_type"]
+            key = f"{struct['name']}.{method['name']}"
+            method_overrides = overrides.get(key, {})
+            if method_overrides:
+                _apply_func_overrides(method, method_overrides)
+
     return module_data
 
 

introspect.py

@@ -226,7 +226,7 @@ def parse_docstring_types(docstring: str) -> tuple[dict[str, str], str | None]:
 
     # Match :type param: ... up to the next RST directive (:arg, :type, :rtype, :return)
     # but NOT :class: or :func: which appear inside type annotations
-    directive_lookahead = r"(?=\n\s*:(?:arg|param|type|rtype|return|returns)[\s:]|$)"
+    directive_lookahead = r"(?=\n\s*:(?:arg|param|type|rtype|return|returns|raises)[\s:]|$)"
     for match in re.finditer(
         rf":type\s+(\w+):\s*(.+?){directive_lookahead}", docstring, re.DOTALL
     ):
@@ -240,6 +240,15 @@ def parse_docstring_types(docstring: str) -> tuple[dict[str, str], str | None]:
     if rtype_match:
         return_type = clean_type_str(rtype_match.group(1).strip())
 
+    # Also match standalone `:type: X` (without a param name) used in
+    # property docstrings (e.g. `:type: bool`, `:type: :class:`Vector``).
+    if return_type is None:
+        bare_type_match = re.search(
+            rf"(?<!\w):type:\s*(.+?){directive_lookahead}", docstring, re.DOTALL
+        )
+        if bare_type_match:
+            return_type = clean_type_str(bare_type_match.group(1).strip())
+
     # Infer Literal types from :arg: descriptions when :type: is just "str".
     # Blender 5.0 and earlier list enum values as ``VALUE`` bullet items in :arg:
     # but only declare :type param: str.
@@ -305,6 +314,9 @@ UNQUALIFIED_TYPES: dict[str, str] = {
 
 def clean_type_str(type_str: str) -> str:
     """Clean up RST type annotations to plain Python type strings."""
+    # Strip "(readonly)" / "(never None)" annotations from Blender docstrings
+    type_str = re.sub(r",?\s*\(readonly\)", "", type_str)
+    type_str = re.sub(r",?\s*\(never None\)", "", type_str)
     type_str = re.sub(r":class:`([^`]+)`", r"\1", type_str)
     # Remove double backtick RST markup
     type_str = re.sub(r"``([^`]+)``", r"\1", type_str)
@@ -1094,6 +1106,191 @@ def _parse_class_constructor(class_doc: str, cls: type) -> FunctionData | None:
     }
 
 
+# Dunders worth exposing in stubs — these affect how the type is used
+# in type checking (subscript, iteration, arithmetic, comparison, etc.)
+_USEFUL_DUNDERS = {
+    "__getitem__",
+    "__setitem__",
+    "__delitem__",
+    "__len__",
+    "__iter__",
+    "__contains__",
+    "__add__",
+    "__radd__",
+    "__iadd__",
+    "__sub__",
+    "__rsub__",
+    "__isub__",
+    "__mul__",
+    "__rmul__",
+    "__imul__",
+    "__matmul__",
+    "__rmatmul__",
+    "__imatmul__",
+    "__truediv__",
+    "__rtruediv__",
+    "__itruediv__",
+    "__neg__",
+    "__pos__",
+    "__invert__",
+    "__eq__",
+    "__ne__",
+    "__lt__",
+    "__le__",
+    "__gt__",
+    "__ge__",
+}
+
+
+def _type_name(obj: object) -> str:
+    """Return the type name of an object, normalizing NoneType to None."""
+    name = type(obj).__name__
+    return "None" if name == "NoneType" else name
+
+
+def _fix_dunder_signatures_with_instance(
+    instance: object, methods: list[FunctionData]
+) -> None:
+    """Fix dunder signatures using an existing instance (for non-constructible types)."""
+    _fix_dunder_signatures(type(instance), methods, instance=instance)
+
+
+def _fix_dunder_signatures(
+    cls: type[object],
+    methods: list[FunctionData],
+    instance: object | None = None,
+) -> None:
+    """Fix dunder method signatures by runtime probing.
+
+    C wrapper descriptors (``__getitem__``, ``__add__``, etc.) have no type
+    info in their docstrings.  We create a default instance of the class and
+    call the dunders to discover actual return types and refine parameter types.
+    """
+
+    # Fixed return types that don't need runtime probing
+    _FIXED_RETURNS: dict[str, str] = {
+        "__len__": "int",
+        "__contains__": "bool",
+        "__eq__": "bool",
+        "__ne__": "bool",
+        "__lt__": "bool",
+        "__le__": "bool",
+        "__gt__": "bool",
+        "__ge__": "bool",
+        "__delitem__": "None",
+        "__setitem__": "None",
+    }
+    for method in methods:
+        fixed = _FIXED_RETURNS.get(method["name"])
+        if fixed is not None:
+            method["return_type"] = fixed
+        if method["name"] == "__len__":
+            method["params"] = []
+        if method["name"] == "__delitem__":
+            method["params"] = [
+                {
+                    "name": "key",
+                    "type": "int",
+                    "default": None,
+                    "kind": "POSITIONAL_OR_KEYWORD",
+                }
+            ]
+
+    if instance is None:
+        try:
+            instance = cls()
+        except Exception:
+            return
+
+    for method in methods:
+        name = method["name"]
+
+        # __getitem__: probe with int index to discover element type
+        if name == "__getitem__":
+            try:
+                result = instance[0]
+                rtype = _type_name(result)
+                method["return_type"] = rtype
+                method["params"] = [
+                    {
+                        "name": "key",
+                        "type": "int",
+                        "default": None,
+                        "kind": "POSITIONAL_OR_KEYWORD",
+                    }
+                ]
+            except Exception:
+                pass
+            continue
+
+        # __setitem__: refine value type from __getitem__ return type
+        if name == "__setitem__":
+            try:
+                result = instance[0]
+                vtype = _type_name(result)
+                method["params"] = [
+                    {
+                        "name": "key",
+                        "type": "int",
+                        "default": None,
+                        "kind": "POSITIONAL_OR_KEYWORD",
+                    },
+                    {
+                        "name": "value",
+                        "type": vtype,
+                        "default": None,
+                        "kind": "POSITIONAL_OR_KEYWORD",
+                    },
+                ]
+            except Exception:
+                pass
+            continue
+
+        # __neg__, __pos__, __invert__: unary ops return same type
+        if name in ("__neg__", "__pos__", "__invert__"):
+            try:
+                op = getattr(instance, name)
+                result = op()
+                method["return_type"] = _type_name(result)
+                method["params"] = []
+            except Exception:
+                pass
+            continue
+
+        # Binary arithmetic: probe with same-type operand to get return type.
+        # The parameter type stays as object (could be Self, float, etc.)
+        if name in (
+            "__add__",
+            "__radd__",
+            "__iadd__",
+            "__sub__",
+            "__rsub__",
+            "__isub__",
+            "__mul__",
+            "__rmul__",
+            "__imul__",
+            "__matmul__",
+            "__rmatmul__",
+            "__imatmul__",
+            "__truediv__",
+            "__rtruediv__",
+            "__itruediv__",
+        ):
+            try:
+                op = getattr(instance, name)
+                result = op(instance)
+                method["return_type"] = _type_name(result)
+            except Exception:
+                # If same-type fails (e.g. Vector / Vector), try with float
+                try:
+                    op = getattr(instance, name)
+                    result = op(1.0)
+                    method["return_type"] = _type_name(result)
+                except Exception:
+                    pass
+            continue
+
+
 def introspect_class(cls: type[object], module_name: str) -> StructData:
     """Introspect a class (C extension or Python) and return StructData."""
     # Determine base class (skip object and internal bases)
@@ -1118,7 +1315,7 @@ def introspect_class(cls: type[object], module_name: str) -> StructData:
     methods: list[FunctionData] = []
 
     for name in sorted(dir(cls)):
-        if name.startswith("_"):
+        if name.startswith("_") and name not in _USEFUL_DUNDERS:
             continue
 
         try:
@@ -1177,6 +1374,13 @@ def introspect_class(cls: type[object], module_name: str) -> StructData:
     if init_method:
         methods.insert(0, init_method)
 
+    # Fix dunder signatures by runtime probing.  C wrapper descriptors have no
+    # type info in docstrings, but we can create a default instance and call
+    # the dunders to discover actual return types and parameter types.
+    dunder_methods = [m for m in methods if m["name"] in _USEFUL_DUNDERS]
+    if dunder_methods:
+        _fix_dunder_signatures(cls, dunder_methods)
+
     return {
         "name": cls.__name__,
         "doc": class_doc,
@@ -1256,7 +1460,7 @@ def introspect_ops_module() -> ModuleData:
             continue
         try:
             result = func()
-            _return_type_fixups[name] = type(result).__name__
+            _return_type_fixups[name] = _type_name(result)
         except Exception:
             pass
 
@@ -1439,6 +1643,53 @@ def introspect_module(module_name: str) -> ModuleData:
 
     infer_getter_return_types(functions)
 
+    # Discover hidden C types reachable through properties of known classes.
+    # E.g. mathutils.Matrix.col returns MatrixAccess which isn't in dir(mathutils).
+    # Only enabled for modules known to have safe, side-effect-free constructors.
+    _SAFE_PROBE_MODULES = {"mathutils"}
+    if module_name in _SAFE_PROBE_MODULES:
+        import builtins as _builtins_mod
+
+        _SKIP_PROP_TYPES = frozenset(
+            ("int", "float", "str", "bool", "NoneType", "list", "tuple", "dict", "set")
+        )
+        known_struct_names = {s["name"] for s in structs}
+        for struct in list(structs):
+            cls = getattr(module, struct["name"], None)
+            if cls is None or not isinstance(cls, type):
+                continue
+            try:
+                instance = cls()
+            except Exception:
+                continue
+            for prop in struct["properties"]:
+                if prop["type"] != "object":
+                    continue
+                try:
+                    val = getattr(instance, prop["name"])
+                except Exception:
+                    continue
+                val_type = type(val)
+                val_name = val_type.__name__
+                if hasattr(_builtins_mod, val_name) or val_name in _SKIP_PROP_TYPES:
+                    continue
+                # Add the hidden type if not already known
+                if val_name not in known_struct_names:
+                    hidden_struct = introspect_class(val_type, module_name)
+                    # Fix dunders using the live instance (since the type
+                    # may not be directly constructible)
+                    dunder_methods = [
+                        m
+                        for m in hidden_struct["methods"]
+                        if m["name"] in _USEFUL_DUNDERS
+                    ]
+                    if dunder_methods:
+                        _fix_dunder_signatures_with_instance(val, dunder_methods)
+                    structs.append(hidden_struct)
+                    known_struct_names.add(val_name)
+                # Fix the property type either way
+                prop["type"] = val_name
+
     return {
         "module": module_name,
         "doc": inspect.getdoc(module) or "",
@@ -1974,7 +2225,12 @@ def introspect_rna_types() -> ModuleData:
         if cls is not None:
             struct = introspect_class(cls, "bpy.types")
             struct["base"] = _GENERIC_BASES[cls_name]
-            struct["methods"] = _EXTRA_DUNDERS[cls_name] + struct["methods"]
+            # Replace introspected dunders with manually-typed versions that
+            # use generic type parameters (_T).
+            extra_names = {m["name"] for m in _EXTRA_DUNDERS[cls_name]}
+            struct["methods"] = _EXTRA_DUNDERS[cls_name] + [
+                m for m in struct["methods"] if m["name"] not in extra_names
+            ]
             structs.append(struct)
 
     # Build a map of collection wrapper class -> element type.

overrides/5.0/gpu.types.json

@@ -0,0 +1,7 @@
+{
+  "GPUShader.uniform_float": {
+    "params": {
+      "value": "float | int | Sequence[float] | mathutils.Matrix | mathutils.Vector | mathutils.Euler | mathutils.Quaternion | mathutils.Color"
+    }
+  }
+}