lr -> pr

pr/ch2/iron-gcd/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "iron-gcd"
+version = "0.1.0"
+authors = ["Kyle Isom <kyle@imap.cc>"]
+
+[dependencies]
+iron = "0.5.1"
+mime = "0.2.3"
+router = "0.5.1"
+urlencoded = "0.5.0"

pr/ch2/iron-gcd/src/main.rs

@@ -0,0 +1,96 @@
+extern crate iron;
+extern crate router;
+extern crate urlencoded;
+#[macro_use] extern crate mime;
+
+use std::str::FromStr;
+use urlencoded::UrlEncodedBody;
+
+use iron::prelude::*;
+use iron::status;
+use router::Router;
+
+fn gcd(mut n: u64, mut m: u64) -> u64 {
+    assert!(n != 0 && m != 0);
+    while m != 0 {
+        if m < n {
+            let t = m;
+            m = n;
+            n = t;
+        }
+        m = m % n;
+    }
+    n
+}
+
+fn main() {
+    let mut router = Router::new();
+
+    router.get("/", get_form, "root");
+    router.post("/gcd", post_gcd, "gcd");
+    
+    println!("Serving on http://localhost:3000...");
+    Iron::new(router).http("localhost:3000").unwrap();
+}
+
+fn get_form(_request: &mut Request) -> IronResult<Response> {
+    let mut response = Response::new();
+
+    response.set_mut(status::Ok);
+    response.set_mut(mime!(Text/Html; Charset=Utf8));
+    response.set_mut(r#"
+	<title>GCD calculator</title>
+	<form action="/gcd" method="post">
+	  <input type="text" name="n" />
+	  <input type="text" name="n" />
+	  <button type="submit">Compute GCD</button>
+	</form>
+    "#);
+
+    Ok(response)
+}
+
+fn post_gcd(request: &mut Request) -> IronResult<Response> {
+    let mut response = Response::new();
+
+    let form_data = match request.get_ref::<UrlEncodedBody>() {
+        Err(e) => {
+            response.set_mut(status::BadRequest);
+            response.set_mut(format!("Error parsing form data: {:?}\n", e));
+            return Ok(response);
+        }
+        Ok(map) => map
+    };
+
+    let unparsed_numbers = match form_data.get("n") {
+        None => {
+            response.set_mut(status::BadRequest);
+            response.set_mut(format!("Form has no 'n' parameters!\n"));
+            return Ok(response);
+        }
+        Some(nums) => nums
+    };
+
+    let mut numbers = Vec::new();
+    for unparsed in unparsed_numbers {
+        match u64::from_str(&unparsed) {
+            Err(_) => {
+                response.set_mut(status::BadRequest);
+                response.set_mut(format!("Value for 'n' parameter isn't a number {:?}\n", unparsed));
+                return Ok(response);
+            }
+            Ok(n) => { numbers.push(n); }
+        }
+    }
+
+    let mut d = numbers[0];
+    for m in &numbers[1..] {
+        d = gcd(d, *m);
+    }
+
+    response.set_mut(status::Ok);
+    response.set_mut(mime!(Text/Html; Charset=Utf8));
+    response.set_mut(format!("The GCD of {:?} is {}.\n", numbers, d));
+
+    Ok(response)
+}