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// Copyright (c) 2016 The Rouille developers // Licensed under the Apache License, Version 2.0 // <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT // license <LICENSE-MIT or http://opensource.org/licenses/MIT>, // at your option. All files in the project carrying such // notice may not be copied, modified, or distributed except // according to those terms. /// Evaluates each parameter until one of them evaluates to something else /// than `Err(RouteError::NoRouteFound)`. /// /// This macro supposes that each route returns a `Result<_, RouteError>`. /// /// # Example /// /// ```no_run /// # #[macro_use] extern crate rouille; /// # fn main() { /// use rouille::{Request, Response, RouteError}; /// /// fn handle_request_a(_: &Request) -> Result<Response, RouteError> { /// # panic!() /// // ... /// } /// /// fn handle_request_b(_: &Request) -> Result<Response, RouteError> { /// # panic!() /// // ... /// } /// /// fn handle_request_c(_: &Request) -> Result<Response, RouteError> { /// # panic!() /// // ... /// } /// /// # let request = unsafe { ::std::mem::uninitialized() }; /// let response = find_route!( /// handle_request_a(request), /// handle_request_b(request), /// handle_request_c(request) /// ); /// # } /// ``` /// #[macro_export] macro_rules! find_route { ($($handler:expr),+) => ({ let mut response = Err($crate::RouteError::NoRouteFound); $( if let Err($crate::RouteError::NoRouteFound) = response { response = $handler; } )+ response }); }