initial work on router compiler

Author: rmorshea

idom_router/__init__.py

@@ -3,19 +3,17 @@
 
 from .router import (
     Route,
-    RouterConstructor,
-    create_router,
     link,
+    router,
     use_location,
     use_params,
     use_query,
 )
 
 __all__ = [
-    "create_router",
-    "link",
     "Route",
-    "RouterConstructor",
+    "link",
+    "router",
     "use_location",
     "use_params",
     "use_query",

idom_router/router.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import re
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Callable, Iterator, Sequence
@@ -9,68 +8,50 @@
 from idom import component, create_context, use_context, use_memo, use_state
 from idom.core.types import VdomAttributesAndChildren, VdomDict
 from idom.core.vdom import coalesce_attributes_and_children
-from idom.types import BackendImplementation, ComponentType, Context, Location
+from idom.types import ComponentType, Context, Location
 from idom.web.module import export, module_from_file
-from starlette.routing import compile_path
+from starlette.routing import compile_path as _compile_starlette_path
+
+from idom_router.types import RoutePattern, RouteCompiler, Route
 
 try:
     from typing import Protocol
 except ImportError:  # pragma: no cover
     from typing_extensions import Protocol  # type: ignore
 
 
-class RouterConstructor(Protocol):
-    def __call__(self, *routes: Route) -> ComponentType:
-        ...
-
-
-def create_router(
-    implementation: BackendImplementation[Any] | Callable[[], Location]
-) -> RouterConstructor:
-    if isinstance(implementation, BackendImplementation):
-        use_location = implementation.use_location
-    elif callable(implementation):
-        use_location = implementation
-    else:
-        raise TypeError(
-            "Expected a 'BackendImplementation' or "
-            f"'use_location' hook, not {implementation}"
-        )
-
-    @component
-    def router(*routes: Route) -> ComponentType | None:
-        initial_location = use_location()
-        location, set_location = use_state(initial_location)
-        compiled_routes = use_memo(
-            lambda: _iter_compile_routes(routes), dependencies=routes
-        )
-        for r in compiled_routes:
-            match = r.pattern.match(location.pathname)
-            if match:
-                return _LocationStateContext(
-                    r.element,
-                    value=_LocationState(
-                        location,
-                        set_location,
-                        {k: r.converters[k](v) for k, v in match.groupdict().items()},
-                    ),
-                    key=r.pattern.pattern,
-                )
-        return None
-
-    return router
-
+def compile_starlette_route(path: str) -> RoutePattern:
+    pattern, _, converters = _compile_starlette_path(path)
+    return RoutePattern(pattern, {k: v.convert for k, v in converters.items()})
 
-@dataclass
-class Route:
-    path: str
-    element: Any
-    routes: Sequence[Route]
 
-    def __init__(self, path: str, element: Any | None, *routes: Route) -> None:
-        self.path = path
-        self.element = element
-        self.routes = routes
+@component
+def router(
+    *routes: Route,
+    compiler: RouteCompiler = compile_starlette_route,
+) -> ComponentType | None:
+    initial_location = use_location()
+    location, set_location = use_state(initial_location)
+    compiled_routes = use_memo(
+        lambda: [(compiler(path), element) for path, element in _iter_routes(routes)],
+        dependencies=routes,
+    )
+    for compiled_route, element in compiled_routes:
+        match = compiled_route.pattern.match(location.pathname)
+        if match:
+            return _LocationStateContext(
+                element,
+                value=_LocationState(
+                    location,
+                    set_location,
+                    {
+                        k: compiled_route.converters[k](v)
+                        for k, v in match.groupdict().items()
+                    },
+                ),
+                key=compiled_route.pattern.pattern,
+            )
+    return None
 
 
 @component
@@ -113,28 +94,13 @@ def use_query(
     )
 
 
-def _iter_compile_routes(routes: Sequence[Route]) -> Iterator[_CompiledRoute]:
-    for path, element in _iter_routes(routes):
-        pattern, _, converters = compile_path(path)
-        yield _CompiledRoute(
-            pattern, {k: v.convert for k, v in converters.items()}, element
-        )
-
-
 def _iter_routes(routes: Sequence[Route]) -> Iterator[tuple[str, Any]]:
     for r in routes:
         for path, element in _iter_routes(r.routes):
             yield r.path + path, element
         yield r.path, r.element
 
 
-@dataclass
-class _CompiledRoute:
-    pattern: re.Pattern[str]
-    converters: dict[str, Callable[[Any], Any]]
-    element: Any
-
-
 def _use_location_state() -> _LocationState:
     location_state = use_context(_LocationStateContext)
     assert location_state is not None, "No location state. Did you use a Router?"
@@ -151,10 +117,6 @@ class _LocationState:
 _LocationStateContext: Context[_LocationState | None] = create_context(None)
 
 _Link = export(
-    module_from_file(
-        "idom-router",
-        file=Path(__file__).parent / "bundle.js",
-        fallback="⏳",
-    ),
+    module_from_file("idom-router", file=Path(__file__).parent / "bundle.js"),
     "Link",
 )

idom_router/types.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import re
+from dataclasses import dataclass
+from typing import Callable, Any, Protocol, Sequence
+
+
+@dataclass
+class Route:
+    path: str
+    element: Any
+    routes: Sequence[Route]
+
+    def __init__(self, path: str, element: Any | None, *routes: Route) -> None:
+        self.path = path
+        self.element = element
+        self.routes = routes
+
+
+class RouteCompiler(Protocol):
+    def __call__(self, path: str) -> RoutePattern:
+        ...
+
+
+@dataclass
+class RoutePattern:
+    pattern: re.Pattern[str]
+    converters: dict[str, Callable[[Any], Any]]

tests/test_router.py

@@ -1,33 +1,19 @@
 import pytest
 from idom import Ref, component, html
-from idom.testing import BackendFixture, DisplayFixture
+from idom.testing import DisplayFixture
 
 from idom_router import (
     Route,
-    RouterConstructor,
-    create_router,
+    router,
     link,
     use_location,
     use_params,
     use_query,
 )
+from idom_router.types import RoutePattern
 
 
-@pytest.fixture
-def router(backend: BackendFixture):
-    return create_router(backend.implementation)
-
-
-def test_create_router(backend):
-    create_router(backend.implementation)
-    create_router(backend.implementation.use_location)
-    with pytest.raises(
-        TypeError, match="Expected a 'BackendImplementation' or 'use_location' hook"
-    ):
-        create_router(None)
-
-
-async def test_simple_router(display: DisplayFixture, router: RouterConstructor):
+async def test_simple_router(display: DisplayFixture):
     def make_location_check(path, *routes):
         name = path.lstrip("/").replace("/", "-")
 
@@ -68,7 +54,7 @@ def sample():
     assert not await root_element.inner_html()
 
 
-async def test_nested_routes(display: DisplayFixture, router: RouterConstructor):
+async def test_nested_routes(display: DisplayFixture):
     @component
     def sample():
         return router(
@@ -94,7 +80,7 @@ def sample():
         await display.page.wait_for_selector(selector)
 
 
-async def test_navigate_with_link(display: DisplayFixture, router: RouterConstructor):
+async def test_navigate_with_link(display: DisplayFixture):
     render_count = Ref(0)
 
     @component
@@ -121,7 +107,7 @@ def sample():
     assert render_count.current == 1
 
 
-async def test_use_params(display: DisplayFixture, router: RouterConstructor):
+async def test_use_params(display: DisplayFixture):
     expected_params = {}
 
     @component
@@ -157,7 +143,7 @@ def sample():
         await display.page.wait_for_selector("#success")
 
 
-async def test_use_query(display: DisplayFixture, router: RouterConstructor):
+async def test_use_query(display: DisplayFixture):
     expected_query = {}
 
     @component
@@ -174,3 +160,44 @@ def sample():
     expected_query = {"hello": ["world"], "thing": ["1", "2"]}
     await display.goto("?hello=world&thing=1&thing=2")
     await display.page.wait_for_selector("#success")
+
+
+def custom_path_compiler(path):
+    pattern = re.compile(path)
+
+
+async def test_custom_path_compiler(display: DisplayFixture):
+    expected_params = {}
+
+    @component
+    def check_params():
+        assert use_params() == expected_params
+        return html.h1({"id": "success"}, "success")
+
+    @component
+    def sample():
+        return router(
+            Route(
+                "/first/{first:str}",
+                check_params(),
+                Route(
+                    "/second/{second:str}",
+                    check_params(),
+                    Route(
+                        "/third/{third:str}",
+                        check_params(),
+                    ),
+                ),
+            ),
+            compiler=lambda path: RoutePattern(re.compile()),
+        )
+
+    await display.show(sample)
+
+    for path, expected_params in [
+        ("/first/1", {"first": "1"}),
+        ("/first/1/second/2", {"first": "1", "second": "2"}),
+        ("/first/1/second/2/third/3", {"first": "1", "second": "2", "third": "3"}),
+    ]:
+        await display.goto(path)
+        await display.page.wait_for_selector("#success")