2 GeneralizedNewtypeDeriving
6 module Network.HTTP.Lucu.Headers
19 import Control.Applicative
21 import Data.Ascii (Ascii, AsciiBuilder, CIAscii)
22 import qualified Data.Ascii as A
23 import Data.Attoparsec.Char8 as P
24 import qualified Data.ByteString as BS
27 import qualified Data.Map as M
28 import qualified Data.Map.Unicode as M
30 import Data.Monoid.Unicode
31 import Network.HTTP.Lucu.Parser.Http
32 import Prelude.Unicode
35 = Headers (Map CIAscii Ascii)
36 deriving (Eq, Show, Monoid)
38 class HasHeaders a where
39 getHeaders ∷ a → Headers
40 setHeaders ∷ a → Headers → a
42 getHeader ∷ CIAscii → a → Maybe Ascii
44 = case getHeaders a of
45 Headers m → M.lookup key m
47 hasHeader ∷ CIAscii → a → Bool
48 {-# INLINE hasHeader #-}
50 = case getHeaders a of
53 getCIHeader ∷ CIAscii → a → Maybe CIAscii
54 {-# INLINE getCIHeader #-}
56 = A.toCIAscii <$> getHeader key a
58 deleteHeader ∷ CIAscii → a → a
59 {-# INLINE deleteHeader #-}
61 = case getHeaders a of
63 → setHeaders a $ Headers $ M.delete key m
65 setHeader ∷ CIAscii → Ascii → a → a
66 {-# INLINE setHeader #-}
68 = case getHeaders a of
70 → setHeaders a $ Headers $ M.insert key val m
72 instance HasHeaders Headers where
76 singleton ∷ CIAscii → Ascii → Headers
77 {-# INLINE singleton #-}
79 = Headers $ M.singleton key val
81 toHeaders ∷ [(CIAscii, Ascii)] → Headers
82 {-# INLINE toHeaders #-}
83 toHeaders = flip mkHeaders (∅)
85 mkHeaders ∷ [(CIAscii, Ascii)] → Headers → Headers
86 mkHeaders [] (Headers m) = Headers m
87 mkHeaders ((key, val):xs) (Headers m)
88 = mkHeaders xs $ Headers $
89 case M.lookup key m of
90 Nothing → M.insert key val m
91 Just old → M.insert key (merge old val) m
93 merge ∷ Ascii → Ascii → Ascii
96 | nullA a ∧ nullA b = (∅)
99 | otherwise = a ⊕ ", " ⊕ b
103 nullA = BS.null ∘ A.toByteString
105 fromHeaders ∷ Headers → [(CIAscii, Ascii)]
106 fromHeaders (Headers m) = M.toList m
109 message-header = field-name ":" [ field-value ]
111 field-value = *( field-content | LWS )
112 field-content = <field-value を構成し、*TEXT あるいは
113 token, separators, quoted-string を連結
116 field-value の先頭および末尾にある LWS は全て削除され、それ以外の
119 headers ∷ Parser Headers
120 {-# INLINEABLE headers #-}
121 headers = do xs ← P.many header
123 return $ toHeaders xs
125 header ∷ Parser (CIAscii, Ascii)
126 header = do name ← A.toCIAscii <$> token
129 values ← content `sepBy` try lws
132 return (name, joinValues values)
134 content ∷ Parser Ascii
135 {-# INLINE content #-}
136 content = A.unsafeFromByteString
138 takeWhile1 (\c → isText c ∧ c ≢ '\x20')
140 joinValues ∷ [Ascii] → Ascii
141 {-# INLINE joinValues #-}
142 joinValues = A.fromAsciiBuilder
144 ∘ intersperse (A.toAsciiBuilder "\x20")
145 ∘ map A.toAsciiBuilder
147 printHeaders ∷ Headers → AsciiBuilder
148 printHeaders (Headers m)
149 = mconcat (map printHeader (M.toList m)) ⊕
150 A.toAsciiBuilder "\x0D\x0A"
152 printHeader ∷ (CIAscii, Ascii) → AsciiBuilder
153 printHeader (name, value)
154 = A.toAsciiBuilder (A.fromCIAscii name) ⊕
155 A.toAsciiBuilder ": " ⊕
156 A.toAsciiBuilder value ⊕
157 A.toAsciiBuilder "\x0D\x0A"