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|
{-# LANGUAGE OverloadedStrings #-}
module Servall.WikiParser
( infobox
, wikiFilter
) where
import Control.Applicative ( (<|>) )
import Data.Attoparsec.Combinator ( lookAhead )
import Data.Attoparsec.Text ( Parser
, anyChar
, char
, choice
, many'
, manyTill
, parse
, parseOnly
, sepBy
, skipMany
, skipSpace
, skipWhile
, space
, string
, takeTill
, takeWhile1
)
import Data.Char ( isAlpha
, isAlphaNum
)
import Data.Either ( fromRight )
import qualified Data.HashMap.Lazy as HM
import Data.List ( find )
import Data.Maybe ( catMaybes
, fromMaybe
, maybeToList
)
import qualified Data.Text as T
import Data.Text ( Text )
import GHC.Generics ( Generic )
import Servall.Types
import Text.Pandoc.Definition ( Block(..)
, Format(..)
, Inline(..)
, Pandoc(..)
, nullAttr
)
import Text.Pandoc.Generic ( topDown )
parseWikiTemplates :: Text -> Either String [WikiTemplate]
parseWikiTemplates = parseOnly wikiP
infobox :: Text -> HM.HashMap Text Text
infobox wiki = maybe
HM.empty
wtFields
(find isInfobox (fromRight [] (parseWikiTemplates wiki)))
isInfobox :: WikiTemplate -> Bool
isInfobox (WikiTemplate name _) = name == "Infobox"
wikiP :: Parser [WikiTemplate]
wikiP = sepBy templateP (commentP <|> skipSpace)
templateP :: Parser WikiTemplate
templateP = do
string "{{"
name <- tempHeaderP
fields <- many' (choice [tempFieldP, commentP >> return Nothing])
string "}}"
return $ WikiTemplate name (HM.fromList (catMaybes fields))
tempHeaderP :: Parser Text
tempHeaderP = do
-- Not sure whether name can contain numbers
skipSpace
-- Does not consider multiple words like Short description
name <- takeWhile1 isAlpha
manyTill anyChar (lookAhead ((char '|' >> return "") <|> string "}}"))
return name
tempFieldP :: Parser (Maybe (Text, Text))
tempFieldP = do
skipSpace >> char '|' >> skipSpace
choice [namedField, tempFieldValueP >> return Nothing]
where
namedField = do
key <- takeWhile1 (\c -> isAlphaNum c || c `elem` ['_', '-'])
skipSpace
char '='
skipSpace
value <- tempFieldValueP
return $ if T.null value then Nothing else Just (key, value)
tempFieldValueP :: Parser Text
tempFieldValueP = do
skipSpace
T.concat <$> many'
(choice [templateP >> return "", commentP >> return "", wikilinkP, simpleP])
where
simpleP :: Parser Text
simpleP = do
t <- T.pack <$> manyTill
anyChar
(lookAhead
( string "[["
<|> string "{{"
<|> string "<!--"
<|> (char '|' >> return "")
<|> string "}}"
)
)
if T.null t then fail "simpleP" else return $ T.unwords $ T.words t
commentP :: Parser ()
commentP = do
skipSpace >> string "<!--" >> untilCommentEnd ""
where
untilCommentEnd :: Text -> Parser ()
untilCommentEnd xs | T.isSuffixOf "--" xs = char '>' >> return ()
untilCommentEnd _ = do
xs <- takeWhile1 (/= '>')
untilCommentEnd xs
wikilinkP :: Parser Text
wikilinkP = do
beg <- string "[["
content <- T.pack <$> manyTill anyChar (string "]]")
return $ beg <> content <> "]]"
wikiFilter :: Text -> Pandoc -> Pandoc
wikiFilter title = fixHeaderTemplates . topDown fixInline . insertHeader title
insertHeader :: Text -> Pandoc -> Pandoc
insertHeader title (Pandoc m bs) =
Pandoc m (Header 1 nullAttr [Str title] : bs)
fixHeaderTemplates :: Pandoc -> Pandoc
fixHeaderTemplates (Pandoc m blocks) = Pandoc m (go [] blocks) where
go :: [Block] -> [Block] -> [Block]
go acc [] = acc
go acc (Header level (x, y, attr) content : bs) =
let (raws, rest) = span isTemplateBlock bs
in go
(acc ++ [Header level (x, y, attr ++ concatMap infobox' raws) content]
)
rest
go acc (b : bs) = go (acc ++ [b]) bs
infobox' :: Block -> [(Text, Text)]
infobox' (RawBlock (Format "mediawiki") temp) =
fromRight []
$ (\wt -> if isInfobox wt then HM.toList (wtFields wt) else [])
<$> parseOnly templateP temp
infobox' _ = []
isTemplateBlock :: Block -> Bool
isTemplateBlock (RawBlock (Format "mediawiki") temp) = True
isTemplateBlock _ = False
fixInline :: Inline -> Inline
fixInline (Link attr label (url, "wikilink")) =
Link attr label ("wiki:" <> url, "")
fixInline (Note (RawBlock (Format "mediawiki") temp : rest)) =
let
fields = fromRight HM.empty (wtFields <$> parseOnly templateP temp)
url = HM.lookup "url" fields
title = HM.lookup "title" fields
link =
(\url' ->
Link nullAttr (maybeToList (Str <$> title)) (url', fromMaybe "" title)
)
<$> url
in
case link of
Just link' -> Note (Plain [link'] : rest)
_ -> Note rest
fixInline x = x
|
