rust example

rust/src/main.rs

@@ -0,0 +1,81 @@
+#[macro_use] extern crate rocket;
+
+#[cfg(test)] mod tests;
+
+#[derive(FromFormField)]
+enum Lang {
+    #[field(value = "en")]
+    English,
+    #[field(value = "ru")]
+    #[field(value = "ру")]
+    Russian
+}
+
+#[derive(FromForm)]
+struct Options<'r> {
+    emoji: bool,
+    name: Option<&'r str>,
+}
+
+// Try visiting:
+//   http://127.0.0.1:8000/hello/world
+#[get("/world")]
+fn world() -> &'static str {
+    "Hello, world!"
+}
+
+// Try visiting:
+//   http://127.0.0.1:8000/hello/мир
+#[get("/мир")]
+fn mir() -> &'static str {
+    "Привет, мир!"
+}
+
+// Try visiting:
+//   http://127.0.0.1:8000/wave/Rocketeer/100
+#[get("/<name>/<age>")]
+fn wave(name: &str, age: u8) -> String {
+    format!("👋 Hello, {} year old named {}!", age, name)
+}
+
+// Note: without the `..` in `opt..`, we'd need to pass `opt.emoji`, `opt.name`.
+//
+// Try visiting:
+//   http://127.0.0.1:8000/?emoji
+//   http://127.0.0.1:8000/?name=Rocketeer
+//   http://127.0.0.1:8000/?lang=ру
+//   http://127.0.0.1:8000/?lang=ру&emoji
+//   http://127.0.0.1:8000/?emoji&lang=en
+//   http://127.0.0.1:8000/?name=Rocketeer&lang=en
+//   http://127.0.0.1:8000/?emoji&name=Rocketeer
+//   http://127.0.0.1:8000/?name=Rocketeer&lang=en&emoji
+//   http://127.0.0.1:8000/?lang=ru&emoji&name=Rocketeer
+#[get("/?<lang>&<opt..>")]
+fn hello(lang: Option<Lang>, opt: Options<'_>) -> String {
+    let mut greeting = String::new();
+    if opt.emoji {
+        greeting.push_str("👋 ");
+    }
+
+    match lang {
+        Some(Lang::Russian) => greeting.push_str("Привет"),
+        Some(Lang::English) => greeting.push_str("Hello"),
+        None => greeting.push_str("Hi"),
+    }
+
+    if let Some(name) = opt.name {
+        greeting.push_str(", ");
+        greeting.push_str(name);
+    }
+
+    greeting.push('!');
+    greeting
+}
+
+#[launch]
+fn rocket() -> _ {
+    rocket::build()
+        .mount("/", routes![hello])
+        .mount("/hello", routes![world, mir])
+        .mount("/wave", routes![wave])
+}