X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=Lucu.git;a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FStatusCode%2FInternal.hs;h=24988eefb2707d4e94aede4ade56f8e1a937d177;hp=9269c5d07625c3f8f16251519c2a72061d76ab7a;hb=3318fe0;hpb=51eda5b02d4528e2e240cbfc228de02b1c83799a

diff --git a/Network/HTTP/Lucu/StatusCode/Internal.hs b/Network/HTTP/Lucu/StatusCode/Internal.hs
index 9269c5d..24988ee 100644
--- a/Network/HTTP/Lucu/StatusCode/Internal.hs
+++ b/Network/HTTP/Lucu/StatusCode/Internal.hs
@@ -1,6 +1,5 @@
 {-# LANGUAGE
-    DeriveDataTypeable
-  , ExistentialQuantification
+    ExistentialQuantification
   , FlexibleInstances
   , TemplateHaskell
   , UnicodeSyntax
@@ -9,6 +8,8 @@
 module Network.HTTP.Lucu.StatusCode.Internal
     ( StatusCode(..)
     , SomeStatusCode(..)
+    , (≈)
+    , (≉)
     , statusCodes
     )
     where
@@ -19,7 +20,6 @@ import Data.Attoparsec.Char8 as P
 import Data.Attoparsec.Lazy as LP
 import qualified Data.ByteString.Lazy.Char8 as Lazy
 import Data.List
-import Data.Typeable
 import Language.Haskell.TH.Lib
 import Language.Haskell.TH.Syntax
 import Language.Haskell.TH.Quote
@@ -28,8 +28,11 @@ import Prelude.Unicode
 
 -- |The type class for HTTP status codes.
 --
+-- Declaring types for each statuses is surely a pain. See:
+-- 'statusCodes'
+--
 -- Minimal complete definition: 'numericCode' and 'textualStatus'.
-class (Eq sc, Show sc, Typeable sc) ⇒ StatusCode sc where
+class Show sc ⇒ StatusCode sc where
     -- |Return the 3-digit integer for this status e.g. @200@
     numericCode ∷ sc → Int
     -- |Return the combination of 3-digit integer and reason phrase
@@ -38,29 +41,68 @@ class (Eq sc, Show sc, Typeable sc) ⇒ StatusCode sc where
     -- |Wrap the status code into 'SomeStatusCode'.
     fromStatusCode ∷ sc → SomeStatusCode
     fromStatusCode = SomeStatusCode
-    -- |Cast the status code from 'SomeStatusCode'.
-    toStatusCode ∷ SomeStatusCode → Maybe sc
-    toStatusCode (SomeStatusCode sc) = cast sc
 
--- |FIXME: doc
+-- |Container type for 'StatusCode' type class.
 data SomeStatusCode
     = ∀sc. StatusCode sc ⇒ SomeStatusCode sc
-      deriving Typeable
 
 instance Show SomeStatusCode where
     show (SomeStatusCode sc) = show sc
 
 instance Eq SomeStatusCode where
-    (SomeStatusCode α) == (SomeStatusCode β)
-        = numericCode α ≡ numericCode β
+    (SomeStatusCode α) == (SomeStatusCode β) = α ≈ β
+
+infix 4 ≈, ≉
+-- |Two 'StatusCode's @a@ and @b@ are said to be equivalent iff
+-- @'numericCode' a '==' 'numericCode' b@.
+--
+-- U+2248, ALMOST EQUAL TO
+(≈) ∷ (StatusCode α, StatusCode β) ⇒ α → β → Bool
+{-# INLINE (≈) #-}
+α ≈ β = numericCode α ≡ numericCode β
+
+-- |@(a ≉ b) '==' 'not' (a ≈ b)@
+--
+-- U+2249, NOT ALMOST EQUAL TO
+(≉) ∷ (StatusCode α, StatusCode β) ⇒ α → β → Bool
+{-# INLINE (≉) #-}
+(≉) = ((¬) ∘) ∘ (≈)
 
 instance StatusCode SomeStatusCode where
     numericCode   (SomeStatusCode sc) = numericCode   sc
     textualStatus (SomeStatusCode sc) = textualStatus sc
     fromStatusCode = id
-    toStatusCode   = Just
 
--- |FIXME: doc
+-- |'QuasiQuoter' for 'StatusCode' declarations.
+--
+-- Top-level splicing
+--
+-- @
+--   ['statusCodes'|
+--   200 OK
+--   400 Bad Request
+--   405 Method Not Allowed
+--   |]
+-- @
+--
+-- becomes:
+--
+-- @
+--   data OK = OK deriving ('Show')
+--   instance OK where
+--     'numericCode'   _ = 200
+--     'textualStatus' _ = 'A.unsafeFromString' \"200 OK\"
+--
+--   data BadRequest = BadRequest deriving ('Show')
+--   instance BadRequest where
+--     'numericCode'   _ = 400
+--     'textualStatus' _ = 'A.unsafeFromString' \"400 Bad Request\"
+--
+--   data MethodNotAllowed = MethodNotAllowed deriving ('Show')
+--   instance MethodNotAllowed where
+--     'numericCode'   _ = 405
+--     'textualStatus' _ = 'A.unsafeFromString' \"405 Method Not Allowed\"
+-- @
 statusCodes ∷ QuasiQuoter
 statusCodes = QuasiQuoter {
                 quoteExp  = const unsupported
@@ -114,14 +156,7 @@ statusDecl (num, phrase)
       name = mkName $ concatMap A.toString phrase
 
       dataDecl ∷ Q Dec
-      dataDecl = dataD (cxt [])
-                       name
-                       []
-                       [con]
-                       [ mkName "Eq"
-                       , mkName "Show"
-                       , mkName "Typeable"
-                       ]
+      dataDecl = dataD (cxt []) name [] [con] [''Show]
 
       instanceDecl ∷ Q [Dec]
       instanceDecl