Subcomponent notation

docs/source/about/changelog.rst

@@ -29,6 +29,7 @@ Unreleased
 - :pull:`1281` - ``reactpy.html`` will now automatically flatten lists recursively (ex. ``reactpy.html(["child1", ["child2"]])``)
 - :pull:`1281` - Added ``reactpy.Vdom`` primitive interface for creating VDOM dictionaries.
 - :pull:`1281` - Added type hints to ``reactpy.html`` attributes.
+- :pull:`1285` - Added support for nested components in web modules
 
 **Changed**
 

src/js/packages/@reactpy/client/src/vdom.tsx

@@ -78,15 +78,16 @@ function createImportSourceElement(props: {
           stringifyImportSource(props.model.importSource),
       );
       return null;
-    } else if (!props.module[props.model.tagName]) {
-      log.error(
-        "Module from source " +
-          stringifyImportSource(props.currentImportSource) +
-          ` does not export ${props.model.tagName}`,
-      );
-      return null;
     } else {
-      type = props.module[props.model.tagName];
+      type = getComponentFromModule(
+        props.module,
+        props.model.tagName,
+        props.model.importSource,
+      );
+      if (!type) {
+        // Error message logged within getComponentFromModule
+        return null;
+      }
     }
   } else {
     type = props.model.tagName;
@@ -103,6 +104,42 @@ function createImportSourceElement(props: {
   );
 }
 
+function getComponentFromModule(
+  module: ReactPyModule,
+  componentName: string,
+  importSource: ReactPyVdomImportSource,
+): any {
+  /*  Gets the component with the provided name from the provided module.
+
+  Built specifically to work on inifinitely deep nested components.
+  For example, component "My.Nested.Component" is accessed from 
+  ModuleA like so: ModuleA["My"]["Nested"]["Component"].
+  */
+  const componentParts: string[] = componentName.split(".");
+  let Component: any = null;
+  for (let i = 0; i < componentParts.length; i++) {
+    const iterAttr = componentParts[i];
+    Component = i == 0 ? module[iterAttr] : Component[iterAttr];
+    if (!Component) {
+      if (i == 0) {
+        log.error(
+          "Module from source " +
+            stringifyImportSource(importSource) +
+            ` does not export ${iterAttr}`,
+        );
+      } else {
+        console.error(
+          `Component ${componentParts.slice(0, i).join(".")} from source ` +
+            stringifyImportSource(importSource) +
+            ` does not have subcomponent ${iterAttr}`,
+        );
+      }
+      break;
+    }
+  }
+  return Component;
+}
+
 function isImportSourceEqual(
   source1: ReactPyVdomImportSource,
   source2: ReactPyVdomImportSource,

src/reactpy/core/vdom.py

@@ -135,6 +135,17 @@ def __init__(
             self.__module__ = module_name
             self.__qualname__ = f"{module_name}.{tag_name}"
 
+    def __getattr__(self, attr: str) -> Vdom:
+        """Supports accessing nested web module components"""
+        if not self.import_source:
+            msg = "Nested components can only be accessed on web module components."
+            raise AttributeError(msg)
+        return Vdom(
+            f"{self.__name__}.{attr}",
+            allow_children=self.allow_children,
+            import_source=self.import_source,
+        )
+
     @overload
     def __call__(
         self, attributes: VdomAttributes, /, *children: VdomChildren

src/reactpy/web/module.py

@@ -260,14 +260,18 @@ def export(
     if isinstance(export_names, str):
         if (
             web_module.export_names is not None
-            and export_names not in web_module.export_names
+            and export_names.split(".")[0] not in web_module.export_names
         ):
             msg = f"{web_module.source!r} does not export {export_names!r}"
             raise ValueError(msg)
         return _make_export(web_module, export_names, fallback, allow_children)
     else:
         if web_module.export_names is not None:
-            missing = sorted(set(export_names).difference(web_module.export_names))
+            missing = sorted(
+                {e.split(".")[0] for e in export_names}.difference(
+                    web_module.export_names
+                )
+            )
             if missing:
                 msg = f"{web_module.source!r} does not export {missing!r}"
                 raise ValueError(msg)

tests/test_core/test_vdom.py

@@ -71,11 +71,11 @@ def test_is_vdom(result, value):
             {"tagName": "div", "attributes": {"tagName": "div"}},
         ),
         (
-            reactpy.Vdom("div")((i for i in range(3))),
+            reactpy.Vdom("div")(i for i in range(3)),
             {"tagName": "div", "children": [0, 1, 2]},
         ),
         (
-            reactpy.Vdom("div")((x**2 for x in [1, 2, 3])),
+            reactpy.Vdom("div")(x**2 for x in [1, 2, 3]),
             {"tagName": "div", "children": [1, 4, 9]},
         ),
         (
@@ -123,6 +123,15 @@ def test_make_vdom_constructor():
     assert no_children() == {"tagName": "no-children"}
 
 
+def test_nested_html_access_raises_error():
+    elmt = Vdom("div")
+
+    with pytest.raises(
+        AttributeError, match="can only be accessed on web module components"
+    ):
+        elmt.fails()
+
+
 @pytest.mark.parametrize(
     "value",
     [
@@ -293,7 +302,7 @@ def test_invalid_vdom(value, error_message_pattern):
 @pytest.mark.skipif(not REACTPY_DEBUG.current, reason="Only warns in debug mode")
 def test_warn_cannot_verify_keypath_for_genereators():
     with pytest.warns(UserWarning) as record:
-        reactpy.Vdom("div")((1 for i in range(10)))
+        reactpy.Vdom("div")(1 for i in range(10))
         assert len(record) == 1
         assert (
             record[0]

tests/test_utils.py

@@ -188,7 +188,11 @@ def test_string_to_reactpy(case):
         # 8: Infer ReactJS `key` from the `key` attribute
         {
             "source": '<div key="my-key"></div>',
-            "model": {"tagName": "div", "attributes": {"key": "my-key"}, "key": "my-key"},
+            "model": {
+                "tagName": "div",
+                "attributes": {"key": "my-key"},
+                "key": "my-key",
+            },
         },
     ],
 )

tests/test_web/js_fixtures/subcomponent-notation.js

@@ -0,0 +1,14 @@
+import React from "https://esm.sh/react@19.0"
+import ReactDOM from "https://esm.sh/react-dom@19.0/client"
+import {InputGroup, Form} from "https://esm.sh/react-bootstrap@2.10.2?deps=react@19.0,react-dom@19.0,react-is@19.0&exports=InputGroup,Form";
+export {InputGroup, Form};
+
+export function bind(node, config) {
+  const root = ReactDOM.createRoot(node);
+  return {
+    create: (type, props, children) => 
+      React.createElement(type, props, ...children),
+    render: (element) => root.render(element),
+    unmount: () => root.unmount()
+  };
+}

tests/test_web/test_module.py

@@ -214,8 +214,8 @@ async def test_keys_properly_propagated(display: DisplayFixture):
 
     The `key` property was being lost in its propagation from the server-side ReactPy
     definition to the front-end JavaScript.
-    
-    This property is required for certain JS components, such as the GridLayout from 
+
+    This property is required for certain JS components, such as the GridLayout from
     react-grid-layout.
     """
     module = reactpy.web.module_from_file(
@@ -224,50 +224,169 @@ async def test_keys_properly_propagated(display: DisplayFixture):
     GridLayout = reactpy.web.export(module, "GridLayout")
 
     await display.show(
-        lambda: GridLayout({
-            "layout": [
-                {
-                    "i": "a",
-                    "x": 0,
-                    "y": 0,
-                    "w": 1,
-                    "h": 2,
-                    "static": True,
-                },
-                {
-                    "i": "b",
-                    "x": 1,
-                    "y": 0,
-                    "w": 3,
-                    "h": 2,
-                    "minW": 2,
-                    "maxW": 4,
-                },
-                {
-                    "i": "c",
-                    "x": 4,
-                    "y": 0,
-                    "w": 1,
-                    "h": 2,
-                }
-            ],
-            "cols": 12,
-            "rowHeight": 30,
-            "width": 1200,
-        },
+        lambda: GridLayout(
+            {
+                "layout": [
+                    {
+                        "i": "a",
+                        "x": 0,
+                        "y": 0,
+                        "w": 1,
+                        "h": 2,
+                        "static": True,
+                    },
+                    {
+                        "i": "b",
+                        "x": 1,
+                        "y": 0,
+                        "w": 3,
+                        "h": 2,
+                        "minW": 2,
+                        "maxW": 4,
+                    },
+                    {
+                        "i": "c",
+                        "x": 4,
+                        "y": 0,
+                        "w": 1,
+                        "h": 2,
+                    },
+                ],
+                "cols": 12,
+                "rowHeight": 30,
+                "width": 1200,
+            },
             reactpy.html.div({"key": "a"}, "a"),
             reactpy.html.div({"key": "b"}, "b"),
             reactpy.html.div({"key": "c"}, "c"),
         )
     )
 
-    parent = await display.page.wait_for_selector(".react-grid-layout", state="attached")
+    parent = await display.page.wait_for_selector(
+        ".react-grid-layout", state="attached"
+    )
     children = await parent.query_selector_all("div")
 
     # The children simply will not render unless they receive the key prop
     assert len(children) == 3
 
 
+async def test_subcomponent_notation_as_str_attrs(display: DisplayFixture):
+    module = reactpy.web.module_from_file(
+        "subcomponent-notation",
+        JS_FIXTURES_DIR / "subcomponent-notation.js",
+    )
+    InputGroup, InputGroupText, FormControl, FormLabel = reactpy.web.export(
+        module, ["InputGroup", "InputGroup.Text", "Form.Control", "Form.Label"]
+    )
+
+    content = reactpy.html.div(
+        {"id": "the-parent"},
+        InputGroup(
+            InputGroupText({"id": "basic-addon1"}, "@"),
+            FormControl(
+                {
+                    "placeholder": "Username",
+                    "aria-label": "Username",
+                    "aria-describedby": "basic-addon1",
+                }
+            ),
+        ),
+        InputGroup(
+            FormControl(
+                {
+                    "placeholder": "Recipient's username",
+                    "aria-label": "Recipient's username",
+                    "aria-describedby": "basic-addon2",
+                }
+            ),
+            InputGroupText({"id": "basic-addon2"}, "@example.com"),
+        ),
+        FormLabel({"htmlFor": "basic-url"}, "Your vanity URL"),
+        InputGroup(
+            InputGroupText({"id": "basic-addon3"}, "https://example.com/users/"),
+            FormControl({"id": "basic-url", "aria-describedby": "basic-addon3"}),
+        ),
+        InputGroup(
+            InputGroupText("$"),
+            FormControl({"aria-label": "Amount (to the nearest dollar)"}),
+            InputGroupText(".00"),
+        ),
+        InputGroup(
+            InputGroupText("With textarea"),
+            FormControl({"as": "textarea", "aria-label": "With textarea"}),
+        ),
+    )
+
+    await display.show(lambda: content)
+
+    parent = await display.page.wait_for_selector("#the-parent", state="visible")
+    input_group_text = await parent.query_selector_all(".input-group-text")
+    form_control = await parent.query_selector_all(".form-control")
+    form_label = await parent.query_selector_all(".form-label")
+
+    assert len(input_group_text) == 6
+    assert len(form_control) == 5
+    assert len(form_label) == 1
+
+
+async def test_subcomponent_notation_as_obj_attrs(display: DisplayFixture):
+    module = reactpy.web.module_from_file(
+        "subcomponent-notation",
+        JS_FIXTURES_DIR / "subcomponent-notation.js",
+    )
+    InputGroup, Form = reactpy.web.export(module, ["InputGroup", "Form"])
+
+    content = reactpy.html.div(
+        {"id": "the-parent"},
+        InputGroup(
+            InputGroup.Text({"id": "basic-addon1"}, "@"),
+            Form.Control(
+                {
+                    "placeholder": "Username",
+                    "aria-label": "Username",
+                    "aria-describedby": "basic-addon1",
+                }
+            ),
+        ),
+        InputGroup(
+            Form.Control(
+                {
+                    "placeholder": "Recipient's username",
+                    "aria-label": "Recipient's username",
+                    "aria-describedby": "basic-addon2",
+                }
+            ),
+            InputGroup.Text({"id": "basic-addon2"}, "@example.com"),
+        ),
+        Form.Label({"htmlFor": "basic-url"}, "Your vanity URL"),
+        InputGroup(
+            InputGroup.Text({"id": "basic-addon3"}, "https://example.com/users/"),
+            Form.Control({"id": "basic-url", "aria-describedby": "basic-addon3"}),
+        ),
+        InputGroup(
+            InputGroup.Text("$"),
+            Form.Control({"aria-label": "Amount (to the nearest dollar)"}),
+            InputGroup.Text(".00"),
+        ),
+        InputGroup(
+            InputGroup.Text("With textarea"),
+            Form.Control({"as": "textarea", "aria-label": "With textarea"}),
+        ),
+    )
+
+    await display.show(lambda: content)
+
+    parent = await display.page.wait_for_selector("#the-parent", state="visible")
+    input_group_text = await parent.query_selector_all(".input-group-text")
+    form_control = await parent.query_selector_all(".form-control")
+    form_label = await parent.query_selector_all(".form-label")
+
+    assert len(input_group_text) == 6
+    assert len(form_control) == 5
+    assert len(form_label) == 1
+
+
 def test_module_from_string():
     reactpy.web.module_from_string("temp", "old")
     with assert_reactpy_did_log(r"Existing web module .* will be replaced with"):