fix: harden UCE runtime and starter

site/examples/uce-starter/index.uce

@@ -1,29 +1,63 @@
-#load "lib/app.uce" 
- 
+#load "lib/app.uce"
+
+DTree starter_router_result(String file, String param = "")
+{
+	DTree result;
+	result["file"] = file;
+	if(param != "")
+		result["param"] = param;
+	return(result);
+}
+
+DTree starter_router_resolve(Request& context)
+{
+	String lpath = context.call["route"]["l_path"].to_string();
+	if(lpath == "")
+		return(DTree());
+
+	String exact = "views/" + lpath + ".uce";
+	if(file_exists(exact))
+		return(starter_router_result(exact));
+
+	String directory_index = "views/" + lpath + "/index.uce";
+	if(file_exists(directory_index))
+		return(starter_router_result(directory_index));
+
+	auto parts = split(lpath, "/");
+	while(parts.size() > 1)
+	{
+		String param = parts.back();
+		parts.pop_back();
+		String parent = join(parts, "/");
+		String parent_index = "views/" + parent + "/index.uce";
+		if(file_exists(parent_index))
+			return(starter_router_result(parent_index, param));
+	}
+
+	return(DTree());
+}
+
 RENDER(Request& context) 
 {
 	app_init(context);
 
-	DTree resolved = app_resolve_view(context);
+	DTree resolved = starter_router_resolve(context);
 
 	ob_start();
 	if(resolved["file"].to_string() != "")
 	{
 		if(resolved["param"].to_string() != "")
-			context.call["app"]["route"]["param"] = resolved["param"];
-		unit_render(resolved["file"].to_string(), context);
+			context.call["route"]["param"] = resolved["param"];
+		print(component(resolved["file"].to_string(), context));
 	}
 	else
 	{
-		app_not_found("The requested page does not exist.", context);
-		<>
-			<section class="card">
-				<h1>404 Not Found</h1>
-				<p><?= context.call["app"]["error"].to_string() ?></p>
-			</section>
-		</>
+		DTree notfound_props;
+		notfound_props["message"] = "The requested page does not exist.";
+		print(component("components/basic/notfound", notfound_props, context));
 	}
+
 	String main_html = ob_get_close();
-	context.call["app"]["fragments"]["main"] = main_html;
-	app_render_page(context);
+	context.call["fragments"]["main"] = main_html;
+	print(component("themes/page", context));
 }