Merge pull request #107 from autarch/autarch/half-assed-router

A partial implementation of the router and associated bits

examples/router.rs

@@ -2,6 +2,7 @@
 
 use dioxus::prelude::*;
 use dioxus::router::{Link, Route, Router};
+use serde::Deserialize;
 
 fn main() {
     dioxus::desktop::launch(app);
@@ -30,7 +31,7 @@ fn app(cx: Scope) -> Element {
 }
 
 fn BlogPost(cx: Scope) -> Element {
-    let post = dioxus::router::use_route(&cx).last_segment()?;
+    let post = dioxus::router::use_route(&cx).last_segment();
 
     cx.render(rsx! {
         div {
@@ -40,9 +41,14 @@ fn BlogPost(cx: Scope) -> Element {
     })
 }
 
+#[derive(Deserialize)]
+struct Query {
+    bold: bool,
+}
+
 fn User(cx: Scope) -> Element {
-    let post = dioxus::router::use_route(&cx).last_segment()?;
-    let bold = dioxus::router::use_route(&cx).param::<bool>("bold");
+    let post = dioxus::router::use_route(&cx).last_segment();
+    let query = dioxus::router::use_route(&cx).query::<Query>();
 
     cx.render(rsx! {
         div {

packages/core/src/scopes.rs

@@ -198,12 +198,9 @@ impl ScopeArena {
             // run the hooks (which hold an &mut Reference)
             // recursively call ensure_drop_safety on all children
             items.borrowed_props.drain(..).for_each(|comp| {
-                let scope_id = comp
-                    .scope
-                    .get()
-                    .expect("VComponents should be associated with a valid Scope");
-
+                if let Some(scope_id) = comp.scope.get() {
                     self.ensure_drop_safety(scope_id);
+                }
 
                 drop(comp.props.take());
             });

packages/router/src/components/link.rs

@@ -31,6 +31,9 @@ pub struct LinkProps<'a> {
     #[props(default, strip_option)]
     id: Option<&'a str>,
 
+    #[props(default, strip_option)]
+    title: Option<&'a str>,
+
     children: Element<'a>,
 
     #[props(default)]
@@ -38,17 +41,25 @@ pub struct LinkProps<'a> {
 }
 
 pub fn Link<'a>(cx: Scope<'a, LinkProps<'a>>) -> Element {
-    let service = cx.consume_context::<RouterService>()?;
-    cx.render(rsx! {
+    log::debug!("render Link to {}", cx.props.to);
+    if let Some(service) = cx.consume_context::<RouterService>() {
+        return cx.render(rsx! {
             a {
                 href: "{cx.props.to}",
                 class: format_args!("{}", cx.props.class.unwrap_or("")),
                 id: format_args!("{}", cx.props.id.unwrap_or("")),
+                title: format_args!("{}", cx.props.title.unwrap_or("")),
 
                 prevent_default: "onclick",
                 onclick: move |_| service.push_route(cx.props.to),
 
                 &cx.props.children
             }
-    })
+        });
+    }
+    log::warn!(
+        "Attempted to create a Link to {} outside of a Router context",
+        cx.props.to,
+    );
+    None
 }

packages/router/src/components/route.rs

@@ -30,6 +30,7 @@ pub fn Route<'a>(cx: Scope<'a, RouteProps<'a>>) -> Element {
             Some(ctx) => ctx.total_route.to_string(),
             None => cx.props.to.to_string(),
         };
+        log::trace!("total route for {} is {}", cx.props.to, total_route);
 
         // provide our route context
         let route_context = cx.provide_context(RouteContext {

packages/router/src/components/router.rs

@@ -12,7 +12,7 @@ pub struct RouterProps<'a> {
     children: Element<'a>,
 
     #[props(default, strip_option)]
-    onchange: Option<&'a Fn(&'a str)>,
+    onchange: Option<&'a dyn Fn(&'a str)>,
 }
 
 #[allow(non_snake_case)]

packages/router/src/hooks/use_route.rs

@@ -1,30 +1,83 @@
 use dioxus_core::ScopeState;
+use gloo::history::{HistoryResult, Location};
+use serde::de::DeserializeOwned;
+use std::{rc::Rc, str::FromStr};
 
-pub struct UseRoute<'a> {
-    cur_route: String,
-    cx: &'a ScopeState,
+use crate::RouterService;
+
+/// This struct provides is a wrapper around the internal router
+/// implementation, with methods for getting information about the current
+/// route.
+pub struct UseRoute {
+    router: Rc<RouterService>,
 }
 
-impl<'a> UseRoute<'a> {
-    /// Parse the query part of the URL
-    pub fn param<T>(&self, param: &str) -> Option<&T> {
-        todo!()
+impl UseRoute {
+    /// This method simply calls the [`Location::query`] method.
+    pub fn query<T>(&self) -> HistoryResult<T>
+    where
+        T: DeserializeOwned,
+    {
+        self.current_location().query::<T>()
     }
 
-    pub fn nth_segment(&self, n: usize) -> Option<&str> {
-        todo!()
+    /// Returns the nth segment in the path. Paths that end with a slash have
+    /// the slash removed before determining the segments. If the path has
+    /// fewer segments than `n` then this method returns `None`.
+    pub fn nth_segment(&self, n: usize) -> Option<String> {
+        let mut segments = self.path_segments();
+        let len = segments.len();
+        if len - 1 < n {
+            return None;
+        }
+        Some(segments.remove(n))
     }
 
-    pub fn last_segment(&self) -> Option<&'a str> {
-        todo!()
+    /// Returns the last segment in the path. Paths that end with a slash have
+    /// the slash removed before determining the segments. The root path, `/`,
+    /// will return an empty string.
+    pub fn last_segment(&self) -> String {
+        let mut segments = self.path_segments();
+        segments.remove(segments.len() - 1)
     }
 
-    /// Parse the segments of the URL, using named parameters (defined in your router)
-    pub fn segment<T>(&self, name: &str) -> Option<&T> {
-        todo!()
+    /// Get the named parameter from the path, as defined in your router. The
+    /// value will be parsed into the type specified by `T` by calling
+    /// `value.parse::<T>()`. This method returns `None` if the named
+    /// parameter does not exist in the current path.
+    pub fn segment<T>(&self, name: &str) -> Option<Result<T, T::Err>>
+    where
+        T: FromStr,
+    {
+        self.router
+            .current_path_params()
+            .get(name)
+            .and_then(|v| Some(v.parse::<T>()))
+    }
+
+    /// Returns the [Location] for the current route.
+    pub fn current_location(&self) -> Location {
+        self.router.current_location()
+    }
+
+    fn path_segments(&self) -> Vec<String> {
+        let location = self.router.current_location();
+        let path = location.path();
+        if path == "/" {
+            return vec![String::new()];
+        }
+        let stripped = &location.path()[1..];
+        stripped.split('/').map(str::to_string).collect::<Vec<_>>()
     }
 }
 
-pub fn use_route<'a>(cx: &'a ScopeState) -> UseRoute<'a> {
-    todo!()
+/// This hook provides access to information about the current location in the
+/// context of a [`Router`]. If this function is called outside of a `Router`
+/// component it will panic.
+pub fn use_route(cx: &ScopeState) -> UseRoute {
+    let router = cx
+        .consume_context::<RouterService>()
+        .expect("Cannot call use_route outside the scope of a Router component")
+        .clone();
+    UseRoute { router }
 }

packages/router/src/platform/mod.rs

@@ -1,5 +1,3 @@
-use url::Url;
-
 pub trait RouterProvider {
     fn get_current_route(&self) -> String;
     fn subscribe_to_route_changes(&self, callback: Box<dyn Fn(String)>);

packages/router/src/service.rs

@@ -1,6 +1,6 @@
-use gloo::history::{BrowserHistory, History, HistoryListener};
+use gloo::history::{BrowserHistory, History, HistoryListener, Location};
 use std::{
-    cell::{Cell, RefCell},
+    cell::{Cell, Ref, RefCell},
     collections::HashMap,
     rc::Rc,
 };
@@ -10,10 +10,9 @@ use dioxus_core::ScopeId;
 pub struct RouterService {
     pub(crate) regen_route: Rc<dyn Fn(ScopeId)>,
     history: Rc<RefCell<BrowserHistory>>,
-    registerd_routes: RefCell<RouteSlot>,
     slots: Rc<RefCell<Vec<(ScopeId, String)>>>,
-    root_found: Rc<Cell<bool>>,
-    cur_root: RefCell<String>,
+    root_found: Rc<Cell<Option<ScopeId>>>,
+    cur_path_params: Rc<RefCell<HashMap<String, String>>>,
     listener: HistoryListener,
 }
 
@@ -40,48 +39,54 @@ impl RouterService {
 
         let _slots = slots.clone();
 
-        let root_found = Rc::new(Cell::new(false));
+        let root_found = Rc::new(Cell::new(None));
         let regen = regen_route.clone();
         let _root_found = root_found.clone();
         let listener = history.listen(move || {
-            _root_found.set(false);
+            _root_found.set(None);
             // checking if the route is valid is cheap, so we do it
-            for (slot, _) in _slots.borrow_mut().iter().rev() {
-                log::trace!("regenerating slot {:?}", slot);
+            for (slot, root) in _slots.borrow_mut().iter().rev() {
+                log::trace!("regenerating slot {:?} for root '{}'", slot, root);
                 regen(*slot);
             }
         });
 
         Self {
-            registerd_routes: RefCell::new(RouteSlot::Routes {
-                partial: String::from("/"),
-                total: String::from("/"),
-                rest: Vec::new(),
-            }),
             root_found,
             history: Rc::new(RefCell::new(history)),
             regen_route,
             slots,
-            cur_root: RefCell::new(path.to_string()),
+            cur_path_params: Rc::new(RefCell::new(HashMap::new())),
             listener,
         }
     }
 
     pub fn push_route(&self, route: &str) {
+        log::trace!("Pushing route: {}", route);
         self.history.borrow_mut().push(route);
     }
 
     pub fn register_total_route(&self, route: String, scope: ScopeId, fallback: bool) {
-        self.slots.borrow_mut().push((scope, route));
+        let clean = clean_route(route);
+        log::trace!("Registered route '{}' with scope id {:?}", clean, scope);
+        self.slots.borrow_mut().push((scope, clean));
     }
 
     pub fn should_render(&self, scope: ScopeId) -> bool {
-        if self.root_found.get() {
+        log::trace!("Should render scope id {:?}?", scope);
+        if let Some(root_id) = self.root_found.get() {
+            log::trace!("  we already found a root with scope id {:?}", root_id);
+            if root_id == scope {
+                log::trace!("    yes - it's a match");
+                return true;
+            }
+            log::trace!("    no - it's not a match");
             return false;
         }
 
         let location = self.history.borrow().location();
         let path = location.path();
+        log::trace!("  current path is '{}'", path);
 
         let roots = self.slots.borrow();
 
@@ -89,15 +94,24 @@ impl RouterService {
 
         // fallback logic
         match root {
-            Some((_id, route)) => {
-                if route == path {
-                    self.root_found.set(true);
+            Some((id, route)) => {
+                log::trace!(
+                    "  matched given scope id {:?} with route root '{}'",
+                    scope,
+                    route,
+                );
+                if let Some(params) = route_matches_path(route, path) {
+                    log::trace!("    and it matches the current path '{}'", path);
+                    self.root_found.set(Some(*id));
+                    *self.cur_path_params.borrow_mut() = params;
                     true
                 } else {
                     if route == "" {
-                        self.root_found.set(true);
+                        log::trace!("    and the route is the root, so we will use that without a better match");
+                        self.root_found.set(Some(*id));
                         true
                     } else {
+                        log::trace!("    and the route '{}' is not the root nor does it match the current path", route);
                         false
                     }
                 }
@@ -105,6 +119,70 @@ impl RouterService {
             None => false,
         }
     }
+
+    pub fn current_location(&self) -> Location {
+        self.history.borrow().location().clone()
+    }
+
+    pub fn current_path_params(&self) -> Ref<HashMap<String, String>> {
+        self.cur_path_params.borrow()
+    }
+}
+
+fn clean_route(route: String) -> String {
+    if route.as_str() == "/" {
+        return route;
+    }
+    route.trim_end_matches('/').to_string()
+}
+
+fn clean_path(path: &str) -> &str {
+    if path == "/" {
+        return path;
+    }
+    path.trim_end_matches('/')
+}
+
+fn route_matches_path(route: &str, path: &str) -> Option<HashMap<String, String>> {
+    let route_pieces = route.split('/').collect::<Vec<_>>();
+    let path_pieces = clean_path(path).split('/').collect::<Vec<_>>();
+
+    log::trace!(
+        "  checking route pieces {:?} vs path pieces {:?}",
+        route_pieces,
+        path_pieces,
+    );
+
+    if route_pieces.len() != path_pieces.len() {
+        log::trace!("    the routes are different lengths");
+        return None;
+    }
+
+    let mut matches = HashMap::new();
+    for (i, r) in route_pieces.iter().enumerate() {
+        log::trace!("    checking route piece '{}' vs path", r);
+        // If this is a parameter then it matches as long as there's
+        // _any_thing in that spot in the path.
+        if r.starts_with(':') {
+            log::trace!(
+                "      route piece '{}' starts with a colon so it matches anything",
+                r,
+            );
+            let param = &r[1..];
+            matches.insert(param.to_string(), path_pieces[i].to_string());
+            continue;
+        }
+        log::trace!(
+            "      route piece '{}' must be an exact match for path piece '{}'",
+            r,
+            path_pieces[i],
+        );
+        if path_pieces[i] != *r {
+            return None;
+        }
+    }
+
+    Some(matches)
 }
 
 pub struct RouterCfg {