Restructure proto

The existing code has been moved out and is being copied back piece / by
piece while restructuring the code to (hopefully) be more manageable.

src/frame/headers.rs

@@ -49,9 +49,6 @@ pub struct PushPromise {
 }
 
 impl PushPromise {
-    pub fn stream_id(&self) -> StreamId {
-        self.stream_id
-    }
 }
 
 #[derive(Debug)]
@@ -177,6 +174,14 @@ impl Headers {
         })
     }
 
+    /// Returns `true` if the frame represents trailers
+    ///
+    /// Trailers are header frames that contain no pseudo headers.
+    pub fn is_trailers(&self) -> bool {
+        self.pseudo.method.is_none() &&
+            self.pseudo.status.is_none()
+    }
+
     pub fn stream_id(&self) -> StreamId {
         self.stream_id
     }

src/frame/mod.rs

@@ -3,6 +3,8 @@ use error::{ConnectionError, Reason};
 
 use bytes::Bytes;
 
+use std::fmt;
+
 /// A helper macro that unpacks a sequence of 4 bytes found in the buffer with
 /// the given identifier, starting at the given offset, into the given integer
 /// type. Obviously, the integer type should be able to support at least 4
@@ -54,7 +56,6 @@ pub use self::settings::{
 
 pub const HEADER_LEN: usize = 9;
 
-#[derive(Debug /*, Clone, PartialEq */)]
 pub enum Frame<T = Bytes> {
     Data(Data<T>),
     Headers(Headers),
@@ -66,50 +67,20 @@ pub enum Frame<T = Bytes> {
 }
 
 impl<T> Frame<T> {
-    pub fn is_connection_frame(&self) -> bool {
+}
+
+impl<T> fmt::Debug for Frame<T> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
         use self::Frame::*;
 
-        match self {
-            &Headers(..) |
-            &Data(..) |
-            &PushPromise(..) |
-            &Reset(..) => false,
-
-            &WindowUpdate(ref v) => v.stream_id().is_zero(),
-
-            &Ping(_) |
-            &Settings(_) => true,
-        }
-    }
-
-    pub fn stream_id(&self) -> StreamId {
-        use self::Frame::*;
-
-        match self {
-            &Headers(ref v) => v.stream_id(),
-            &Data(ref v) => v.stream_id(),
-            &PushPromise(ref v) => v.stream_id(),
-            &WindowUpdate(ref v) => v.stream_id(),
-            &Reset(ref v) => v.stream_id(),
-
-            &Ping(_) |
-            &Settings(_) => StreamId::zero(),
-        }
-    }
-
-    pub fn is_end_stream(&self) -> bool {
-        use self::Frame::*;
-
-        match self {
-            &Headers(ref v) => v.is_end_stream(),
-            &Data(ref v) => v.is_end_stream(),
-
-            &PushPromise(_) |
-            &WindowUpdate(_) |
-            &Ping(_) |
-            &Settings(_) => false,
-
-            &Reset(_) => true,
+        match *self {
+            Data(..) => write!(fmt, "Frame::Data(..)"),
+            Headers(ref frame) => write!(fmt, "Frame::Headers({:?})", frame),
+            PushPromise(ref frame) => write!(fmt, "Frame::PushPromise({:?})", frame),
+            Settings(ref frame) => write!(fmt, "Frame::Settings({:?})", frame),
+            Ping(ref frame) => write!(fmt, "Frame::Ping({:?})", frame),
+            WindowUpdate(ref frame) => write!(fmt, "Frame::WindowUpdate({:?})", frame),
+            Reset(ref frame) => write!(fmt, "Frame::Reset({:?})", frame),
         }
     }
 }

src/frame/ping.rs

@@ -12,10 +12,6 @@ pub struct Ping {
 }
 
 impl Ping {
-    pub fn ping(payload: Payload) -> Ping {
-        Ping { ack: false, payload }
-    }
-
     pub fn pong(payload: Payload) -> Ping {
         Ping { ack: true, payload }
     }

src/frame/settings.rs

@@ -66,21 +66,10 @@ impl Settings {
         }
     }
 
-    pub fn new(values: SettingSet) -> Settings {
-        Settings {
-            flags: SettingsFlags::empty(),
-            values: values,
-        }
-    }
-
     pub fn is_ack(&self) -> bool {
         self.flags.is_ack()
     }
 
-    pub fn into_set(self) -> SettingSet {
-        self.values
-    }
-
     pub fn load(head: Head, payload: &[u8]) -> Result<Settings, Error> {
         use self::Setting::*;