Style changes, move stuff to common parser module

1 files changed, 25 insertions, 0 deletions

diff --git a/src/Hakyll/Core/Util/Parser.hs b/src/Hakyll/Core/Util/Parser.hs
new file mode 100644
index 0000000..afa72c1
--- /dev/null
+++ b/src/Hakyll/Core/Util/Parser.hs
@@ -0,0 +1,25 @@
+--------------------------------------------------------------------------------
+-- | Parser utilities
+module Hakyll.Core.Util.Parser
+    ( metadataKey
+    , reservedKeys
+    ) where
+
+
+--------------------------------------------------------------------------------
+import           Control.Applicative ((<$>), (<*>), (<|>))
+import           Control.Monad       (mzero)
+import qualified Text.Parsec         as P
+import           Text.Parsec.String  (Parser)
+
+
+--------------------------------------------------------------------------------
+metadataKey :: Parser String
+metadataKey = do
+    i <- (:) <$> P.letter <*> (P.many $ P.alphaNum <|> P.oneOf " _-.")
+    if i `elem` reservedKeys then mzero else return i
+
+
+--------------------------------------------------------------------------------
+reservedKeys :: [String]
+reservedKeys = ["if", "else","endif"]