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|
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeOperators #-}
module Main where
import Control.Applicative ( (<|>) )
import Control.Lens ( (^.)
, (^?)
)
import Control.Monad.IO.Class ( liftIO )
import Data.Aeson ( FromJSON
, ToJSON
, Value
, decode
, encode
)
import qualified Data.Aeson.KeyMap as KM
( KeyMap
, lookup
)
import Data.Aeson.Lens ( AsNumber(..)
, AsValue(..)
, key
)
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 qualified Data.ByteString.Lazy as BSL
import Data.Char ( isAlpha
, isAlphaNum
)
import Data.Either ( fromRight )
import qualified Data.HashMap.Lazy as HM
import Data.List ( find
, isSuffixOf
)
import Data.Maybe ( catMaybes
, fromJust
)
import Data.Proxy ( Proxy(..) )
import qualified Data.Text as T
import Data.Text ( Text )
import qualified Data.Text.Encoding as TE
import GHC.Generics ( Generic )
import Network.Wai.Handler.Warp ( run )
import Network.Wreq ( Response
, get
, responseBody
)
import Prelude hiding ( takeWhile )
import Servant ( (:<|>)(..)
, (:>)
, Application
, Capture
, FromHttpApiData(..)
, Get
, Handler
, JSON
, PlainText
, Server
, serve
)
import Text.Pandoc ( WrapOption(..)
, WriterOptions(..)
, def
, readMediaWiki
, runIOorExplode
, writeNative
, writeOrg
)
import Text.Regex.TDFA ( (=~) )
type API = Wikipedia
type Wikipedia
= SearchWikipedia :<|> GetWikiFormat :<|> GetOrgFormat :<|> GetPandocFormat :<|> GetWpSummary :<|> GetInfobox
-- TODO: fix the problem with plaintext having the wront content-type: text/plain
type SearchWikipedia
= "wikipedia" :> "search" :> Capture "query" Text :> Get '[PlainText] Text
type GetWikiFormat
= "wikipedia" :> "wiki" :> Capture "name" Text :> Get '[JSON] Text
type GetOrgFormat
= "wikipedia" :> "org" :> Capture "name" Text :> Get '[JSON] Text
type GetPandocFormat
= "wikipedia" :> "pandoc" :> Capture "name" Text :> Get '[JSON] Text
type GetWpSummary
= "wikipedia" :> "summary" :> Capture "name" Text :> Get '[PlainText] Text
type GetInfobox
= "wikipedia" :> "infobox" :> Capture "name" Text :> Get '[JSON] (HM.HashMap Text Text)
server :: Server API
server =
searchWikipedia
:<|> getWikiFormat
:<|> getOrgFormat
:<|> getPandocFormat
:<|> getWpSummary
:<|> getInfobox
searchWikipedia :: Text -> Handler Text
searchWikipedia query = do
r <- liftIO $ get
("https://en.wikipedia.org/w/api.php?action=query&format=json&list=search&srsearch="
<> (T.unpack query)
)
return $ TE.decodeUtf8 $ BSL.toStrict $ r ^. responseBody
getWikiFormat :: Text -> Handler Text
getWikiFormat name = do
r <- liftIO $ get
("https://en.wikipedia.org/wiki/" <> (T.unpack name) <> "?action=raw")
return $ TE.decodeUtf8 $ BSL.toStrict $ r ^. responseBody
getOrgFormat :: Text -> Handler Text
getOrgFormat name = do
wiki <- getWikiFormat name
liftIO $ runIOorExplode $ readMediaWiki def wiki >>= writeOrg def
{ writerWrapText = WrapNone
}
getPandocFormat :: Text -> Handler Text
getPandocFormat name = do
wiki <- getWikiFormat name
liftIO $ runIOorExplode $ readMediaWiki def wiki >>= writeNative def
{ writerWrapText = WrapNone
}
getWpSummary :: Text -> Handler Text
getWpSummary name = do
r <- liftIO $ get
("https://en.wikipedia.org/api/rest_v1/page/summary/" <> (T.unpack name))
return $ TE.decodeUtf8 $ BSL.toStrict $ r ^. responseBody
getInfobox :: Text -> Handler (HM.HashMap Text Text)
getInfobox name = do
wiki <- getWikiFormat name
return $ maybe
HM.empty
wtFields
(find (\(WikiTemplate name _) -> name == "Infobox")
(fromRight [] (parseOnly wikiP wiki))
)
wikiP :: Parser [WikiTemplate]
wikiP = sepBy templateP (commentP <|> skipSpace)
data WikiTemplate = WikiTemplate
{ wtName :: Text
-- , wtSubName :: Maybe Text
, wtFields :: HM.HashMap Text Text
}
deriving (Show, Generic)
instance ToJSON WikiTemplate
instance FromJSON WikiTemplate
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 == '_')
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 <> "]]"
app :: Application
app = serve api server
api :: Proxy API
api = Proxy
main :: IO ()
main = do
run 5555 app
|
