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-- | Module providing a function to parse a page from a file
--
module Hakyll.Web.Page.Read
( readPage
) where
import Control.Applicative ((<$>), (<*>), (<*))
import qualified Data.Map as M
import Text.Parsec.Char (alphaNum, anyChar, char, newline, oneOf, string)
import Text.Parsec.Combinator (choice, many1, manyTill, option, skipMany1)
import Text.Parsec.Prim (many, parse, skipMany, (<?>))
import Text.Parsec.String (Parser)
import Hakyll.Core.Util.String
import Hakyll.Web.Page.Internal
-- | Space or tab, no newline
inlineSpace :: Parser Char
inlineSpace = oneOf ['\t', ' '] <?> "space"
-- | Parse a single metadata field
--
metadataField :: Parser (String, String)
metadataField = do
key <- manyTill alphaNum $ char ':'
skipMany1 inlineSpace <?> "space followed by metadata for: " ++ key
value <- manyTill anyChar newline
trailing' <- many trailing
return (key, trim $ value ++ concat trailing')
where
trailing = (++) <$> many1 inlineSpace <*> manyTill anyChar newline
-- | Parse a metadata block, including delimiters and trailing newlines
--
metadata :: Parser [(String, String)]
metadata = do
open <- many1 (char '-') <* many inlineSpace <* newline
metadata' <- many metadataField
_ <- choice $ map (string . replicate (length open)) ['-', '.']
skipMany inlineSpace
skipMany1 newline
return metadata'
-- | Parse a Hakyll page
--
page :: Parser ([(String, String)], String)
page = do
metadata' <- option [] metadata
body <- many anyChar
return (metadata', body)
readPage :: String -> Page String
readPage input = case parse page "page" input of
Left err -> error (show err)
Right (md, b) -> Page (M.fromList md) b
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