passing thru root reference

.gitignore

@@ -8,3 +8,6 @@ wheels/
 
 # Virtual environments
 .venv
+
+
+*.ipynb

Dev.ipynb

@@ -1,19 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "e1b794f1",
-   "metadata": {},
-   "outputs": [],
-   "source": []
-  }
- ],
- "metadata": {
-  "language_info": {
-   "name": "python"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

pyproject.toml

@@ -19,6 +19,9 @@ dev = [
     "rich>=14.3.3",
     "ruff>=0.15.2",
 ]
+test = [
+    "pytest>=9.0.2",
+]
 
 [tool.ruff]
 line-length = 120

src/hooked_containers/__init__.py

@@ -1,2 +0,0 @@
-def hello() -> str:
-    return "Hello from hooked-containers!"

src/hooked_containers/common.py

@@ -1,33 +0,0 @@
-from collections.abc import Callable, MutableSequence
-from typing import Generic, TypeVar
-
-from . import events as e
-
-T = TypeVar("T")
-
-
-class HookedContainer(Generic[T]):
-    _path: MutableSequence[int]
-    hook: Callable[[e.ChangeEvent[T]], None] | None
-
-    def __repr__(self):
-        return f"{self.__class__.__name__}({self._data!r})"
-
-    def __len__(self):
-        return len(self._data)
-
-    def __iter__(self):
-        return iter(self._data)
-
-    def __contains__(self, value):
-        return value in self._data
-
-    def __setitem__(self, s, value):
-        self._data[s] = value
-        if self.hook:
-            self.hook(e.SetItemEvent(index=s, item=value))
-
-    def __delitem__(self, s):
-        del self._data[s]
-        if self.hook:
-            self.hook(e.RemoveItemEvent(index=s, item=self._data[s]))

src/hooked_containers/container.py

@@ -0,0 +1,62 @@
+from abc import ABC, abstractmethod
+from collections.abc import Container, Iterable, MutableMapping, MutableSequence, Sized
+from typing import TypeVar
+
+from . import events as e
+from .events import HookFunction
+from .types import MutableNesting
+
+T = TypeVar("T")
+
+
+class HookedContainer(ABC, Sized, Iterable[T], Container[T]):
+    _data: MutableNesting[T]
+    _path: MutableSequence[int]
+    _root: MutableMapping[T] | MutableSequence[T] | None = None
+    hook: HookFunction
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}({self._data!r})"
+
+    def __len__(self):
+        return len(self._data)
+
+    def __iter__(self):
+        return iter(self._data)
+
+    def __contains__(self, x):
+        return x in self._data
+
+    # Sequence Methods
+    # __contains__, __iter__, __reversed__, index, and count
+
+    @abstractmethod
+    def __getitem__(self, key): ...
+
+    # MutableSequence Methods
+    # append, reverse, extend, pop, remove, and __iadd__
+
+    def __setitem__(self, s, value):
+        self._data[s] = value
+        if self.hook:
+            self.hook(e.SetItemEvent(self._root, self.new_path(s), value))
+
+    def __delitem__(self, s):
+        item = self._data.pop(s)
+        if self.hook:
+            self.hook(e.RemoveItemEvent(self._root, self.new_path(s), item))
+
+    # @abstractmethod
+    # def insert(self, index, value): ...
+
+    # Custom Methods
+
+    def new_path(self, key):
+        return (*self._path, key)
+
+    def get_nested(self, keys):
+        """Recursively call __getitem__ with each key in the iterable."""
+        result = self
+        for key in keys:
+            result = result[key]
+        return result

src/hooked_containers/events.py

@@ -1,24 +1,33 @@
-from dataclasses import dataclass
-from typing import Generic, TypeVar
+from __future__ import annotations
+
+from collections.abc import MutableSequence
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING, Generic, Protocol, TypeVar
+
+if TYPE_CHECKING:
+    from .mapping import HookedMapping
 
 T = TypeVar("T")
 
 
 @dataclass(frozen=True)
 class ChangeEvent(Generic[T]):
-    index: int
-
-
-@dataclass(frozen=True)
-class AddItemEvent(ChangeEvent[T]):
+    root: HookedMapping[T] = field(repr=False)
+    path: MutableSequence[int]
     item: T
 
 
 @dataclass(frozen=True)
-class SetItemEvent(ChangeEvent[T]):
-    item: T
+class AddItemEvent(ChangeEvent[T]): ...
 
 
 @dataclass(frozen=True)
-class RemoveItemEvent(ChangeEvent[T]):
-    item: T
+class SetItemEvent(ChangeEvent[T]): ...
+
+
+@dataclass(frozen=True)
+class RemoveItemEvent(ChangeEvent[T]): ...
+
+
+class HookFunction(Protocol):
+    def __call__(self, event: ChangeEvent[T]) -> None: ...

src/hooked_containers/mapping.py

@@ -1,20 +1,72 @@
-from collections.abc import Callable, MutableMapping, MutableSequence, Sequence
-from typing import Generic, TypeVar
+from collections.abc import MutableMapping, MutableSequence
+from typing import TypeVar
 
 from . import events as e
+from .container import HookedContainer, MutableNesting
+from .events import HookFunction
 
 T = TypeVar("T")
 
 
-class HookedMapping(Generic[T], MutableMapping[T, T | MutableSequence[T], MutableMapping[T]]):
-    _data: MutableSequence[T]
-    _path: MutableSequence[int]
-    hook: Callable[[e.ChangeEvent[T]], None] | None
+class HookedMapping(HookedContainer[T], MutableMapping[T, MutableNesting[T]]):
+    _data: MutableMapping[T, MutableNesting[T]]
 
-    def __init__(self, hook, existing: MutableMapping[T], path: Sequence[int] | None = None):
-        self.hook = hook
+    def __init__(
+        self,
+        existing: MutableMapping[T, MutableNesting[T]],
+        hook: HookFunction | None = None,
+        root: MutableMapping[T] | None = None,
+        path: MutableSequence[int] | None = None,
+    ):
+        match existing:
+            case HookedMapping(_data=seq):
+                self._data = seq
+            case MutableMapping() as seq:
+                self._data = seq
+            case _:
+                raise TypeError(f"Expected a mapping, got {type(existing)}")
+                # self._data = dict(it)
         self._data = existing
+        self.hook = hook
+        self._root = root if root is not None else self
         self._path = list(path) if path is not None else []
 
-    def __setitem__(self, key):
-        return
+    def __wrap_sub__(self, other, **kwargs):
+        return HookedMapping(other, hook=self.hook, root=self._root, **kwargs)
+
+    def __getitem__(self, key: T) -> MutableNesting[T]:
+        if key not in self._data:
+            return self.__wrap_sub__(self.__setitem__(key, {}), path=self.new_path(key))
+        value = self._data[key]
+        match value:
+            case MutableMapping() as mapping:
+                return self.__wrap_sub__(mapping, path=self.new_path(key))
+            case _ as item:
+                return item
+
+    def __setitem__(
+        self,
+        key: T,
+        value: MutableNesting[T],
+        *,
+        suppress_hook: bool = False,
+    ) -> MutableNesting[T] | None:
+        new_path = self.new_path(key)
+        event = (
+            e.SetItemEvent(self._root, new_path, value)
+            if key in self._data
+            else e.AddItemEvent(self._root, new_path, value)
+        )
+        match value:
+            case HookedMapping(_data=value):
+                self._data[key] = value
+            case _:
+                self._data[key] = value
+        if self.hook and not suppress_hook:
+            self.hook(event)
+        return value
+
+    def __delitem__(self, key: T) -> None:
+        item = self._data.pop(key)
+        if self.hook:
+            self.hook(e.RemoveItemEvent(self._root, self.new_path(key), item))

src/hooked_containers/sequence.py

@@ -1,37 +1,49 @@
-from collections.abc import Iterable, MutableSequence, Sequence
+from collections.abc import MutableSequence
 from copy import copy
 from typing import TypeVar
 
 from . import events as e
-from .common import HookedContainer
+from .container import HookedContainer
+from .events import HookFunction
+from .types import MutableNesting
 
 T = TypeVar("T")
 
 
 class HookedList(HookedContainer[T], MutableSequence[T]):
     _data: MutableSequence[T]
+    path: MutableSequence[int]
 
-    def __init__(self, hook, existing: Iterable[T], path: Sequence[int] | None = None):
+    def __init__(
+        self,
+        existing: MutableSequence[T],
+        hook: HookFunction | None = None,
+        root: MutableNesting[T] | None = None,
+        path: MutableSequence[int] | None = None,
+    ) -> None:
         self.hook = hook
         match existing:
+            case HookedContainer(_data=seq):
+                self._data = seq
             case MutableSequence() as seq:
                 self._data = seq
             case _ as it:
                 self._data = list(it)
+        self._root = root if root is not None else self
         self._path = list(path) if path is not None else []
 
     def __getitem__(self, s):
-        # print("Getting item:", s)
+        new_path = copy(self._path)
+        new_path.append(s)
         match self._data[s]:
+            case HookedContainer(_data=seq):
+                return type(self)(seq, self.hook, root=self._root, path=new_path)
             case MutableSequence() as seq:
-                new_path = copy(self._path)
-                new_path.append(s)
-                # print(new_path)
-                return HookedList(self.hook, existing=seq, path=new_path)
+                return HookedList(seq, self.hook, root=self._root, path=new_path)
             case _ as item:
                 return item
 
     def insert(self, index, value):
         self._data.insert(index, value)
         if self.hook:
-            self.hook(e.AddItemEvent(index=index, item=value))
+            self.hook(e.AddItemEvent(self._root, self.new_path(index), value))

src/hooked_containers/state.py

@@ -0,0 +1,43 @@
+from collections.abc import MutableMapping
+from datetime import datetime
+
+from .mapping import HookedMapping
+
+
+class EntityState(HookedMapping[str]):
+    def __setitem__(self, key, value):
+        super().__setitem__(key, value)
+        super().__setitem__("last_changed", datetime.now(), suppress_hook=True)
+
+
+class DomainState(HookedMapping[str]):
+    _data: MutableMapping[str, EntityState]
+
+    def __getitem__(self, key):
+        match super().__getitem__(key):
+            case HookedMapping(_data=val):
+                return EntityState(val, hook=self.hook, path=self.new_path(key))
+            case _ as val:
+                raise TypeError(f"Expected a mapping for domain state, got {type(val)}")
+
+
+class NameSpaceState(HookedMapping[str]):
+    _data: MutableMapping[str, DomainState]
+
+    def __getitem__(self, key):
+        match super().__getitem__(key):
+            case HookedMapping(_data=val):
+                return DomainState(val, hook=self.hook, path=self.new_path(key))
+            case _ as val:
+                raise TypeError(f"Expected a mapping for domain state, got {type(val)}")
+
+
+class FullState(HookedMapping[str]):
+    _data: MutableMapping[str, NameSpaceState]
+
+    def __getitem__(self, key):
+        match super().__getitem__(key):
+            case HookedMapping(_data=val):
+                return NameSpaceState(val, hook=self.hook, path=self.new_path(key))
+            case _ as val:
+                raise TypeError(f"Expected a mapping for namespace state, got {type(val)}")

src/hooked_containers/types.py

@@ -0,0 +1,6 @@
+from collections.abc import MutableMapping, MutableSequence
+from typing import TypeVar
+
+T = TypeVar("T")
+
+type MutableNesting[T] = T | MutableSequence[T] | MutableMapping[T, MutableNesting[T]]

tests/test_mapping.py

@@ -0,0 +1,68 @@
+from dataclasses import dataclass, field
+
+from hooked_containers import events as e
+from hooked_containers.mapping import HookedMapping
+
+
+@dataclass
+class HookTracker:
+    added: list[e.AddItemEvent] = field(default_factory=list)
+    set: list[e.SetItemEvent] = field(default_factory=list)
+    removed: list[e.RemoveItemEvent] = field(default_factory=list)
+
+    def hook(self, event: e.ChangeEvent):
+        match event:
+            case e.AddItemEvent():
+                self.added.append(event.item)
+            case e.SetItemEvent():
+                self.set.append(event.item)
+            case e.RemoveItemEvent():
+                self.removed.append(event.item)
+
+
+class TestHookedMapping:
+    class TestConstruction:
+        def test_empty(self):
+            m = HookedMapping({})
+            assert m._data == {}
+            assert dict(m) == {}
+
+        def test_with_existing(self):
+            existing = {"a": 1, "b": 2}
+            og_id = id(existing)
+            m = HookedMapping(existing)
+            assert id(m._data) == og_id
+            assert dict(m) == existing
+
+        def test_nesting(self):
+            existing = {"a": {"x": 1}, "b": {"y": 2}}
+            m = HookedMapping(existing)
+            assert dict(m) == existing
+            assert dict(m["a"]) == {"x": 1}
+            assert dict(m["b"]) == {"y": 2}
+
+    class TestMappingOps:
+        def test_setitem(self):
+            tracker = HookTracker()
+            m = HookedMapping({}, tracker.hook)
+            m["a"] = 1
+            assert m._data == {"a": 1}
+            assert tracker.added == [1]
+
+        def test_nested_setitem(self):
+            tracker = HookTracker()
+            m = HookedMapping({"a": {}}, tracker.hook)
+            m["a"]["x"] = 1
+            assert m._data == {"a": {"x": 1}}
+            assert tracker.added == [1]
+
+        def test_getitem(self):
+            m = HookedMapping({"a": 1})
+            assert m["a"] == 1
+
+        def test_delitem(self):
+            tracker = HookTracker()
+            m = HookedMapping({"a": 1}, tracker.hook)
+            del m["a"]
+            assert not m["a"]
+            assert tracker.removed == [1]

tests/test_sequence.py

@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+from typing import Any
+
+from hooked_containers.sequence import HookedList
+
+
+def get_id(a: Any):
+    return str(hex(id(a)))
+
+
+class TestHookedList:
+    class TestConstruction:
+        def test_empty(self):
+            lst = HookedList([])
+            assert list(lst) == []
+
+        def test_with_items(self):
+            lst = HookedList([1, 2, 3])
+            assert list(lst) == [1, 2, 3]
+
+        def test_recreation(self):
+            initial = [1, 2, 3]
+            initial_id = id(initial)
+
+            lst = HookedList(initial)
+            assert id(lst._data) == initial_id
+
+            lst2 = HookedList(lst)
+            assert id(lst2._data) == initial_id
+
+    class TestSeqOps:
+        def test_len(self):
+            lst = HookedList([1, 2, 3])
+            assert len(lst) == 3
+
+        def test_getitem(self):
+            lst = HookedList([1, 2, 3])
+            assert lst[0] == 1
+            assert lst[1] == 2
+            assert lst[-1] == 3
+
+        def test_contains(self):
+            lst = HookedList([1, 2, 3])
+            assert 2 in lst
+            assert 4 not in lst
+
+        def test_iter(self):
+            lst = HookedList([1, 2, 3])
+            for i, item in enumerate(lst, start=1):
+                assert item == i
+
+    class TestMutableOps:
+        def test_setitem(self):
+            added = []
+            lst = HookedList(
+                [1, 2, [4, 5, [6, 7]]],
+                lambda e: added.append(e.item),
+            )
+            lst[0] = 10
+            lst.append(20)
+            assert added == [10, 20]
+
+            lst[2][-1].append(8)
+            assert added == [10, 20, 8]
+
+        def test_delitem(self):
+            lst = HookedList([1, 2, 3])
+            del lst[1]
+            assert list(lst) == [1, 3]
+
+        def test_insert(self):
+            lst = HookedList([1, 3])
+            lst.insert(1, 2)
+            assert list(lst) == [1, 2, 3]

uv.lock

@@ -145,6 +145,9 @@ dev = [
     { name = "rich" },
     { name = "ruff" },
 ]
+test = [
+    { name = "pytest" },
+]
 
 [package.metadata]
 
@@ -154,6 +157,16 @@ dev = [
     { name = "rich", specifier = ">=14.3.3" },
     { name = "ruff", specifier = ">=0.15.2" },
 ]
+test = [{ name = "pytest", specifier = ">=9.0.2" }]
+
+[[package]]
+name = "iniconfig"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/72/34/14ca021ce8e5dfedc35312d08ba8bf51fdd999c576889fc2c24cb97f4f10/iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730", size = 20503, upload-time = "2025-10-18T21:55:43.219Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/cb/b1/3846dd7f199d53cb17f49cba7e651e9ce294d8497c8c150530ed11865bb8/iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12", size = 7484, upload-time = "2025-10-18T21:55:41.639Z" },
+]
 
 [[package]]
 name = "ipykernel"
@@ -334,6 +347,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/48/31/05e764397056194206169869b50cf2fee4dbbbc71b344705b9c0d878d4d8/platformdirs-4.9.2-py3-none-any.whl", hash = "sha256:9170634f126f8efdae22fb58ae8a0eaa86f38365bc57897a6c4f781d1f5875bd", size = 21168, upload-time = "2026-02-16T03:56:08.891Z" },
 ]
 
+[[package]]
+name = "pluggy"
+version = "1.6.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f9/e2/3e91f31a7d2b083fe6ef3fa267035b518369d9511ffab804f839851d2779/pluggy-1.6.0.tar.gz", hash = "sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3", size = 69412, upload-time = "2025-05-15T12:30:07.975Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
+]
+
 [[package]]
 name = "prompt-toolkit"
 version = "3.0.52"
@@ -410,6 +432,22 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/c7/21/705964c7812476f378728bdf590ca4b771ec72385c533964653c68e86bdc/pygments-2.19.2-py3-none-any.whl", hash = "sha256:86540386c03d588bb81d44bc3928634ff26449851e99741617ecb9037ee5ec0b", size = 1225217, upload-time = "2025-06-21T13:39:07.939Z" },
 ]
 
+[[package]]
+name = "pytest"
+version = "9.0.2"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "iniconfig" },
+    { name = "packaging" },
+    { name = "pluggy" },
+    { name = "pygments" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
+]
+
 [[package]]
 name = "python-dateutil"
 version = "2.9.0.post0"