Fixup forms documentation for new features.

lib/src/config/mod.rs

@@ -102,7 +102,7 @@
 //! address = "0.0.0.0"
 //! ```
 //!
-//! ## Environment Variables
+//! ### Environment Variables
 //!
 //! All configuration parameters, including extras, can be overridden through
 //! environment variables. To override the configuration parameter `{param}`,

lib/src/request/form/form_items.rs

@@ -1,8 +1,6 @@
 use memchr::memchr2;
 
-/// Iterator over the key/value pairs of a given HTTP form string. You'll likely
-/// want to use this if you're implementing [FromForm](trait.FromForm.html)
-/// manually, for whatever reason, by iterating over the items in `form_string`.
+/// Iterator over the key/value pairs of a given HTTP form string.
 ///
 /// **Note:** The returned key/value pairs are _not_ URL decoded. To URL decode
 /// the raw strings, use `String::from_form_value`:
@@ -21,6 +19,23 @@ use memchr::memchr2;
 /// }
 /// ```
 ///
+/// # Completion
+///
+/// The iterator keeps track of whether the form string was parsed to completion
+/// to determine if the form string was malformed. The iterator can be queried
+/// for completion via the [completed](#method.completed) method, which returns
+/// `true` if the iterator parsed the entire string that was passed to it. The
+/// iterator can also attempt to parse any remaining contents via
+/// [exhausted](#method.exhausted); this method returns `true` if exhaustion
+/// succeeded.
+///
+/// This iterator guarantees that all valid form strings are parsed to
+/// completion. The iterator attempts to be lenient. In particular, it allows
+/// the following oddball behavior:
+///
+///   * A single trailing `&` character is allowed.
+///   * Empty values are allowed.
+///
 /// # Examples
 ///
 /// `FormItems` can be used directly as an iterator:
@@ -53,11 +68,71 @@ pub struct FormItems<'f> {
 }
 
 impl<'f> FormItems<'f> {
+    /// Returns `true` if the form string was parsed to completion. Returns
+    /// `false` otherwise. All valid form strings will parse to completion,
+    /// while invalid form strings will not.
+    ///
+    /// # Example
+    ///
+    /// A valid form string parses to completion:
+    ///
+    /// ```rust
+    /// use rocket::request::FormItems;
+    ///
+    /// let mut items = FormItems::from("a=b&c=d");
+    /// let key_values: Vec<_> = items.by_ref().collect();
+    ///
+    /// assert_eq!(key_values.len(), 2);
+    /// assert_eq!(items.completed(), true);
+    /// ```
+    ///
+    /// In invalid form string does not parse to completion:
+    ///
+    /// ```rust
+    /// use rocket::request::FormItems;
+    ///
+    /// let mut items = FormItems::from("a=b&=d");
+    /// let key_values: Vec<_> = items.by_ref().collect();
+    ///
+    /// assert_eq!(key_values.len(), 1);
+    /// assert_eq!(items.completed(), false);
+    /// ```
     #[inline]
     pub fn completed(&self) -> bool {
         self.next_index >= self.string.len()
     }
 
+    /// Parses all remaining key/value pairs and returns `true` if parsing ran
+    /// to completion. All valid form strings will parse to completion, while
+    /// invalid form strings will not.
+    ///
+    /// # Example
+    ///
+    /// A valid form string can be exhausted:
+    ///
+    /// ```rust
+    /// use rocket::request::FormItems;
+    ///
+    /// let mut items = FormItems::from("a=b&c=d");
+    ///
+    /// assert!(items.next().is_some());
+    /// assert_eq!(items.completed(), false);
+    /// assert_eq!(items.exhausted(), true);
+    /// assert_eq!(items.completed(), true);
+    /// ```
+    ///
+    /// An invalid form string cannot be exhausted:
+    ///
+    /// ```rust
+    /// use rocket::request::FormItems;
+    ///
+    /// let mut items = FormItems::from("a=b&=d");
+    ///
+    /// assert!(items.next().is_some());
+    /// assert_eq!(items.completed(), false);
+    /// assert_eq!(items.exhausted(), false);
+    /// assert_eq!(items.completed(), false);
+    /// ```
     pub fn exhausted(&mut self) -> bool {
         while let Some(_) = self.next() {  }
         self.completed()
@@ -69,6 +144,28 @@ impl<'f> FormItems<'f> {
         self.next_index = self.string.len()
     }
 
+    /// Retrieves the original string being parsed by this iterator. The string
+    /// returned by this method does not change, regardless of the status of the
+    /// iterator.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// use rocket::request::FormItems;
+    ///
+    /// let form_string = "a=b&c=d";
+    /// let mut items = FormItems::from(form_string);
+    /// assert_eq!(items.inner_str(), form_string);
+    ///
+    /// assert!(items.next().is_some());
+    /// assert_eq!(items.inner_str(), form_string);
+    ///
+    /// assert!(items.next().is_some());
+    /// assert_eq!(items.inner_str(), form_string);
+    ///
+    /// assert!(items.next().is_none());
+    /// assert_eq!(items.inner_str(), form_string);
+    /// ```
     #[inline]
     pub fn inner_str(&self) -> &'f str {
         self.string
@@ -76,6 +173,8 @@ impl<'f> FormItems<'f> {
 }
 
 impl<'f> From<&'f str> for FormItems<'f> {
+    /// Returns an iterator over the key/value pairs in the
+    /// `x-www-form-urlencoded` form `string`.
     fn from(string: &'f str) -> FormItems<'f> {
         FormItems {
             string: string,
@@ -159,6 +258,7 @@ mod test {
         check_form!("a=b&a=", &[("a", "b"), ("a", "")]);
 
         check_form!(@bad "user=&password");
+        check_form!(@bad "user=x&&");
         check_form!(@bad "a=b&a");
         check_form!(@bad "=");
         check_form!(@bad "&");

lib/src/request/form/from_form.rs

@@ -1,8 +1,7 @@
 use request::FormItems;
 
-/// Trait to create an instance of some type from an HTTP form. The
-/// [Form](struct.Form.html) type requires that its generic parameter implements
-/// this trait.
+/// Trait to create an instance of some type from an HTTP form.
+/// [Form](struct.Form.html) requires its generic type to implement this trait.
 ///
 /// This trait can be automatically derived via the
 /// [rocket_codegen](/rocket_codegen) plugin:
@@ -44,17 +43,16 @@ use request::FormItems;
 ///
 /// # Implementing
 ///
-/// If you implement `FormForm` yourself, use the
-/// [FormItems](struct.FormItems.html) iterator to iterate through the form
-/// key/value pairs. Be aware that form fields that are typically hidden from
-/// your application, such as `_method`, will be present while iterating.
+/// An implementation of `FromForm` uses the [FormItems](struct.FormItems.html)
+/// iterator to iterate through the raw form key/value pairs. Be aware that form
+/// fields that are typically hidden from your application, such as `_method`,
+/// will be present while iterating.
 pub trait FromForm<'f>: Sized {
     /// The associated error to be returned when parsing fails.
     type Error;
 
-    /// Parses an instance of `Self` from a raw HTTP form string
-    /// (`application/x-www-form-urlencoded data`) or returns an `Error` if one
-    /// cannot be parsed.
+    /// Parses an instance of `Self` from the form items or returns an `Error`
+    /// if one cannot be parsed.
     fn from_form_items(form_items: &mut FormItems<'f>) -> Result<Self, Self::Error>;
 }
 

lib/src/request/form/mod.rs

@@ -37,7 +37,7 @@ use outcome::Outcome::*;
 /// A `FromData` type for parsing `FromForm` types.
 ///
 /// This type implements the `FromData` trait. It provides a generic means to
-/// parse arbitrary structure from incoming form data.
+/// parse arbitrary structures from incoming form data.
 ///
 /// # Usage
 ///
@@ -251,12 +251,17 @@ impl<'f, T: FromForm<'f> + Debug + 'f> Debug for Form<'f, T> {
 ///
 /// If the content type of the request data is not
 /// `application/x-www-form-urlencoded`, `Forward`s the request. If the form
-/// data cannot be parsed into a `T` or reading the incoming stream failed,
-/// returns a `Failure` with the raw form string (if avaialble).
+/// data cannot be parsed into a `T`, a `Failure` with status code
+/// `UnprocessableEntity` is returned. If the form string is malformed, a
+/// `Failure` with status code `BadRequest` is returned. Finally, if reading the
+/// incoming stream fails, returns a `Failure` with status code
+/// `InternalServerError`. In all failure cases, the raw form string is returned
+/// if it was able to be retrieved from the incoming stream.
 ///
 /// All relevant warnings and errors are written to the console in Rocket
 /// logging format.
 impl<'f, T: FromForm<'f>> FromData for Form<'f, T> where T::Error: Debug {
+    /// The raw form string, if it was able to be retrieved from the request.
     type Error = Option<String>;
 
     fn from_data(request: &Request, data: Data) -> data::Outcome<Self, Self::Error> {

lib/src/request/from_request.rs

@@ -71,7 +71,7 @@ impl<S, E> IntoOutcome<S, (Status, E), ()> for Result<S, E> {
 /// Rocket implements `FromRequest` for several built-in types. Their behavior
 /// is documented here.
 ///
-///   * **URI**
+///   * **&URI**
 ///
 ///     Extracts the [URI](/rocket/http/uri/struct.URI.html) from the incoming
 ///     request.

lib/src/request/mod.rs

@@ -12,5 +12,6 @@ pub use self::param::{FromParam, FromSegments};
 pub use self::form::{Form, FromForm, FromFormValue, FormItems};
 pub use self::state::State;
 
-/// Type alias to retrieve flash messages from a request.
+/// Type alias to retrieve [Flash](/rocket/response/struct.Flash.html) messages
+/// from a request.
 pub type FlashMessage = ::response::Flash<()>;

lib/src/request/request.rs

@@ -20,7 +20,7 @@ use http::hyper;
 ///
 /// This should be used sparingly in Rocket applications. In particular, it
 /// should likely only be used when writing
-/// [FromRequest](/rocket/request/struct.Request.html) implementations. It
+/// [FromRequest](/rocket/request/trait.FromRequest.html) implementations. It
 /// contains all of the information for a given web request except for the body
 /// data. This includes the HTTP method, URI, cookies, headers, and more.
 pub struct Request<'r> {
@@ -319,7 +319,8 @@ impl<'r> Request<'r> {
         *self.params.borrow_mut() = route.get_param_indexes(self.uri());
     }
 
-    /// Get the `n`th path parameter as a string, if it exists.
+    /// Get the `n`th path parameter as a string, if it exists. This is used by
+    /// codegen.
     #[doc(hidden)]
     pub fn get_param_str(&self, n: usize) -> Option<&str> {
         let params = self.params.borrow();
@@ -364,7 +365,7 @@ impl<'r> Request<'r> {
     }
 
     /// Get the segments beginning at the `n`th dynamic parameter, if they
-    /// exist.
+    /// exist. Used by codegen.
     #[doc(hidden)]
     pub fn get_raw_segments(&self, n: usize) -> Option<Segments> {
         let params = self.params.borrow();

lib/src/request/state.rs

@@ -11,7 +11,7 @@ use http::Status;
 /// number of handlers. A value for the given type must previously have been
 /// registered to be managed by Rocket via the
 /// [manage](/rocket/struct.Rocket.html#method.manage) method. The type being
-/// managed must be thread safe and sendable across thread boundaries. In otehr
+/// managed must be thread safe and sendable across thread boundaries. In other
 /// words, it must implement `Send + Sync + 'static`.
 ///
 /// # Example