feat(rossweisse): initial implementation of struct router framework

1 files changed, 91 insertions, 0 deletions

diff --git a/rossweisse/src/lib.rs b/rossweisse/src/lib.rs
new file mode 100644
index 0000000..315a0de
--- /dev/null
+++ b/rossweisse/src/lib.rs
@@ -0,0 +1,91 @@
+// This file is part of Windmark <https://github.com/gemrest/windmark>.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2023 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#![deny(
+  clippy::all,
+  clippy::nursery,
+  clippy::pedantic,
+  future_incompatible,
+  nonstandard_style,
+  rust_2018_idioms,
+  unsafe_code,
+  unused,
+  warnings
+)]
+#![recursion_limit = "128"]
+
+mod implementations;
+
+use proc_macro::TokenStream;
+use syn::Item;
+
+/// Marks a `struct` as a router or marks an `impl` block as a router
+/// implementation
+///
+/// # Examples
+///
+/// ```rust
+/// #[rossweisse::router]
+/// struct Router {
+///   _phantom: (),
+/// }
+///
+/// #[rossweisse::router]
+/// impl Router {
+///   #[route]
+///   pub fn index(
+///     _context: windmark::context::RouteContext,
+///   ) -> windmark::Response {
+///     windmark::Response::success("Hello, World!")
+///   }
+/// }
+/// ```
+#[proc_macro_attribute]
+pub fn router(arguments: TokenStream, item: TokenStream) -> TokenStream {
+  let output = match syn::parse::<Item>(item.clone()) {
+    Ok(Item::Struct(item)) => implementations::fields(arguments, item),
+    Ok(Item::Impl(item)) => implementations::methods(arguments, item),
+    _ => panic!("`#[rossweisse::router]` can only be used on `struct`s"),
+  };
+
+  output.into()
+}
+
+/// Marks a method of a router implementation as a route to mount
+///
+/// # Examples
+///
+/// ```rust
+/// #[rossweisse::router]
+/// impl Router {
+///   #[route]
+///   pub fn index(
+///     _context: windmark::context::RouteContext,
+///   ) -> windmark::Response {
+///     windmark::Response::success("Hello, World!")
+///   }
+/// }
+/// ```
+#[proc_macro_attribute]
+pub fn route(arguments: TokenStream, item: TokenStream) -> TokenStream {
+  let output = match syn::parse::<Item>(item.clone()) {
+    Ok(Item::Fn(item)) => implementations::route(arguments, item),
+    _ => panic!("`#[rossweisse::route]` can only be used on `fn`s"),
+  };
+
+  output.into()
+}