Implement the basic parsing for Accept header.

src/header/common/accept.rs

@@ -1,5 +1,6 @@
 use header::Header;
 use std::fmt::{mod, Show};
+use std::str::from_utf8;
 use mime::Mime;
 
 /// The `Accept` header.
@@ -26,7 +27,27 @@ impl Header for Accept {
     }
 
     fn parse_header(_raw: &[Vec<u8>]) -> Option<Accept> {
-        unimplemented!()
+        let mut mimes: Vec<Mime> = vec![];
+        for mimes_raw in _raw.iter() {
+            match from_utf8(mimes_raw.as_slice()) {
+                Some(mimes_str) => {
+                    for mime_str in mimes_str.split(',') {
+                        match from_str(mime_str.trim()) {
+                            Some(mime) => mimes.push(mime),
+                            None => return None
+                        }
+                    }
+                },
+                None => return None
+            };
+        }
+
+        if !mimes.is_empty() {
+            Some(Accept(mimes))
+        } else {
+            // Currently is just a None, but later it can be Accept for */*
+            None
+        }
     }
 
     fn fmt_header(&self, fmt: &mut fmt::Formatter) -> fmt::Result {

src/header/mod.rs

@@ -356,7 +356,7 @@ mod tests {
     use mime::{Mime, Text, Plain};
     use super::CaseInsensitive;
     use super::{Headers, Header};
-    use super::common::{ContentLength, ContentType};
+    use super::common::{ContentLength, ContentType, Accept};
 
     fn mem(s: &str) -> MemReader {
         MemReader::new(s.as_bytes().to_vec())
@@ -383,6 +383,18 @@ mod tests {
         assert_eq!(content_type, Some(ContentType(Mime(Text, Plain, vec![]))));
     }
 
+    #[test]
+    fn test_accept() {
+        let text_plain = Mime(Text, Plain, vec![]);
+        let application_vendor = from_str("application/vnd.github.v3.full+json; q=0.5").unwrap();
+
+        let accept = Header::parse_header(["text/plain".as_bytes().to_vec()].as_slice());
+        assert_eq!(accept, Some(Accept(vec![text_plain.clone()])));
+        
+        let accept = Header::parse_header(["application/vnd.github.v3.full+json; q=0.5, text/plain".as_bytes().to_vec()].as_slice());
+        assert_eq!(accept, Some(Accept(vec![application_vendor, text_plain])));
+    }
+
     #[deriving(Clone)]
     struct CrazyLength(Option<bool>, uint);