Forms are now working!

examples/forms/src/main.rs

@@ -14,21 +14,70 @@ fn user_page(username: &str) -> String {
     format!("This is {}'s page.", username)
 }
 
-// #[derive(FormItem)] // FIXME: Make that happen.
+// #[derive(FromForm)] // FIXME: Make that happen.
 struct UserLogin<'a> {
     username: &'a str,
     password: &'a str
 }
 
-trait FormItem: Sized {
-    fn from_form_string(s: &str) -> Result<Self, Error>;
+fn form_items<'f>(string: &'f str, items: &mut [(&'f str, &'f str)]) -> usize {
+    let mut param_num = 0;
+    let mut rest = string;
+    while rest.len() > 0 && param_num < items.len() {
+        let (key, remainder) = match rest.find('=') {
+            Some(index) => (&rest[..index], &rest[(index + 1)..]),
+            None => return param_num
+        };
+
+        rest = remainder;
+        let (value, remainder) = match rest.find('&') {
+            Some(index) => (&rest[..index], &rest[(index + 1)..]),
+            None => (rest, "")
+        };
+
+        rest = remainder;
+        items[param_num] = (key, value);
+        param_num += 1;
+    }
+
+    param_num
 }
 
-impl<'a> FormItem for UserLogin<'a> {
-    fn from_form_string(s: &str) -> Result<Self, Error> {
+trait FromForm<'f>: Sized {
+    fn from_form_string(s: &'f str) -> Result<Self, Error>;
+}
+
+// FIXME: Add a 'FromFormValue' trait and use it on each field in the form
+// structure. Should be pretty simple. Implement for all FromStr and then
+// implement for OptionT: FromFormValue> so forms still exist. Maybe have a way
+// for FromFormValue types to have an error that says why it didn't work. This
+// will help for validation. IE, can have a type Range(1, 10) that returns an
+// enum with one of: TooLow(isize), TooHigh(isize), etc.
+impl<'f> FromForm<'f> for UserLogin<'f> {
+    fn from_form_string(s: &'f str) -> Result<Self, Error> {
+        let mut items = [("", ""); 2];
+        let form_count = form_items(s, &mut items);
+        if form_count != 2 {
+            return Err(Error::BadParse);
+        }
+
+        let mut username = None;
+        let mut password = None;
+        for &(key, value) in &items {
+            match key {
+                "username" => username = Some(value),
+                "password" => password = Some(value),
+                _ => return Err(Error::BadParse)
+            }
+        }
+
+        if username.is_none() || password.is_none() {
+            return Err(Error::BadParse);
+        }
+
         Ok(UserLogin {
-            username: "this",
-            password: "that"
+            username: username.unwrap(),
+            password: password.unwrap()
         })
     }
 }
@@ -39,7 +88,7 @@ impl<'a> FormItem for UserLogin<'a> {
 fn login(user: UserLogin) -> Result<Redirect, String> {
     match user.username {
         "Sergio" => match user.password {
-            "password" => Ok(Redirect::other("/user/some_name")),
+            "password" => Ok(Redirect::other("/user/Sergio")),
             _ => Err("Wrong password!".to_string())
         },
         _ => Err(format!("Unrecognized user, '{}'.", user.username))
@@ -51,3 +100,55 @@ fn main() {
     rocket.mount("/", routes![files::index, files::files, user_page, login]);
     rocket.launch();
 }
+
+#[cfg(test)]
+mod test {
+    use super::form_items;
+
+    macro_rules! check_form {
+        ($string:expr, $expected: expr) => ({
+            let mut output = Vec::with_capacity($expected.len());
+            unsafe { output.set_len($expected.len()); }
+
+            let results = output.as_mut_slice();
+            assert_eq!($expected.len(), form_items($string, results));
+
+            for i in 0..results.len() {
+                let (expected_key, actual_key) = ($expected[i].0, results[i].0);
+                let (expected_val, actual_val) = ($expected[i].1, results[i].1);
+
+                assert!(expected_key == actual_key,
+                    "key [{}] mismatch: expected {}, got {}",
+                        i, expected_key, actual_key);
+
+                assert!(expected_val == actual_val,
+                    "val [{}] mismatch: expected {}, got {}",
+                        i, expected_val, actual_val);
+            }
+        })
+    }
+
+    #[test]
+    fn test_form_string() {
+        let results = &[("username", "user"), ("password", "pass")];
+        check_form!("username=user&password=pass", results);
+
+        let results = &[("user", "user"), ("user", "pass")];
+        check_form!("user=user&user=pass", results);
+
+        let results = &[("user", ""), ("password", "pass")];
+        check_form!("user=&password=pass", results);
+
+        let results = &[("", ""), ("", "")];
+        check_form!("=&=", results);
+
+        let results = &[("a", "b")];
+        check_form!("a=b", results);
+
+        let results = &[("a", "b")];
+        check_form!("a=b&a", results);
+
+        let results = &[("a", "b"), ("a", "")];
+        check_form!("a=b&a=", results);
+    }
+}

lib/src/request.rs

@@ -5,14 +5,16 @@ pub use hyper::server::Request as HyperRequest;
 
 pub struct Request<'a> {
     params: Vec<&'a str>,
-    uri: &'a str,
+    pub uri: &'a str,
+    pub data: &'a [u8]
 }
 
 impl<'a> Request<'a> {
-    pub fn new(params: Vec<&'a str>, uri: &'a str) -> Request<'a> {
+    pub fn new(params: Vec<&'a str>, uri: &'a str, data: &'a [u8]) -> Request<'a> {
         Request {
             params: params,
-            uri: uri
+            uri: uri,
+            data: data
         }
     }
 

lib/src/rocket.rs

@@ -31,7 +31,7 @@ impl HyperHandler for Rocket {
                 let route = self.router.route(method, uri_str);
                 let mut response = route.map_or(Response::not_found(), |route| {
                     let params = route.get_params(uri_str);
-                    let request = Request::new(params, uri_str);
+                    let request = Request::new(params, uri_str, &buf);
                     (route.handler)(request)
                 });
 

lib/src/router/uri.rs

@@ -154,19 +154,15 @@ impl<'a> Iterator for Segments<'a> {
 
     fn next(&mut self) -> Option<Self::Item> {
         // Find the start of the next segment (first that's not '/').
-        let s = self.0.chars().enumerate().skip_while(|&(_, c)| c == '/').next();
-        if s.is_none() {
-            return None;
-        }
-
-        // i is the index of the first character that's not '/'
-        let (i, _) = s.unwrap();
+        let i = match self.0.find(|c| c != '/') {
+            Some(index) => index,
+            None => return None
+        };
 
         // Get the index of the first character that _is_ a '/' after start.
         // j = index of first character after i (hence the i +) that's not a '/'
         let rest = &self.0[i..];
-        let mut end_iter = rest.chars().enumerate().skip_while(|&(_, c)| c != '/');
-        let j = end_iter.next().map_or(self.0.len(), |(j, _)| i + j);
+        let j = rest.find('/').map_or(self.0.len(), |j| i + j);
 
         // Save the result, update the iterator, and return!
         let result = Some(&self.0[i..j]);

macros/src/route_decorator.rs

@@ -310,10 +310,20 @@ fn get_form_stmt(ecx: &ExtCtxt, fn_args: &mut Vec<SimpleArg>,
     quote_stmt!(ecx,
         // TODO: Actually get the form parameters to pass into from_form_string.
         // Alternatively, pass in some already parsed thing.
-        let $param_ident: $param_ty = match FormItem::from_form_string("test string") {
-            Ok(v) => v,
-            Err(_) => return rocket::Response::not_found()
-        };
+        let $param_ident: $param_ty = {
+            let form_string = std::str::from_utf8(_req.data);
+            if form_string.is_err() {
+                return rocket::Response::not_found()
+            };
+
+            match FromForm::from_form_string(form_string.unwrap()) {
+                Ok(v) => v,
+                Err(_) => {
+                    println!("\t=> Form failed to parse.");
+                    return rocket::Response::not_found()
+                }
+            }
+        }
     )
 }