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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE FlexibleInstances #-}
module VDV451 where
import qualified Data.ByteString.Lazy as LB
import qualified Data.ByteString as SB
import Data.ByteString (ByteString)
import Data.Text (Text)
import qualified Data.Text as T
import Data.Vector (Vector)
import qualified Data.Vector as V
import qualified Data.ByteString.Char8 as C8
import GHC.Base (ord)
import Fmt ((+|),(|+))
import Data.Time (Day, toGregorian, UTCTime (..), DiffTime, formatTime, defaultTimeLocale, isLeapYear)
import Data.String (IsString)
import GHC.Exts (IsString(..))
import Data.Time.Format.ISO8601 (formatShow)
import Data.Data (Proxy (..))
import Data.Time.Calendar.MonthDay (monthAndDayToDayOfYear)
import Codec.Archive.Zip (toEntry, emptyArchive, addEntryToArchive, Archive)
class ÖPNVEncode a where
encode :: a -> ByteString
default encode :: Show a => a -> ByteString
encode = C8.pack . show
instance ÖPNVEncode Text where
-- hopefully not too naive iso8859-1 encoding
encode text = if T.null unsafe
then C8.pack bytes
else error ("invalid unicode in iso8859-1 string: "+|unsafe|+".")
where (safe, unsafe) = T.span (\c -> ord c <= 0xFF) text
bytes = "\"" <> concatMap escape (T.unpack safe) <> "\""
escape c = case c of
'"' -> "\"\""
a -> [a]
instance ÖPNVEncode Day where
encode day = "\""+|crop 2 d|+"."+|crop 2 m|+"."+|crop 4 y|+"\""
where (y,m,d) = toGregorian day
-- | for things which can be encoded as either string or number,
-- this module defaults to strings. Add this newtype to the schema
-- to make things encode as numbers instead.
newtype AsNumber a = AsNumber a
instance ÖPNVEncode (AsNumber Day) where
encode (AsNumber day) =
encode (d*1000000 + m*10000 + (fromInteger y `mod` 10000))
where (y,m,d) = toGregorian day
instance ÖPNVEncode DiffTime where
encode = C8.pack . formatTime defaultTimeLocale "\"%2H:%2M:%2S\""
instance ÖPNVEncode Int
instance ÖPNVEncode Integer
-- | these are encoded in a horrible format
newtype Longitude = Longitude Double
newtype Latitude = Latitude Double
encodeGeoLength :: Double -> ByteString
encodeGeoLength d' = ""+|sign|+""+|crop 3 deg|+""+|crop 2 min|+""+|crop 5 sec|+""
where deg = truncate d
min = truncate (d * 60) `mod` 60
sec = truncate (d * 3600 * 1000) `mod` (60 * 1000)
d = abs d'
sign :: Text
sign = if d' < 0 then "-" else ""
instance ÖPNVEncode Latitude where
encode (Latitude d) = encodeGeoLength d
instance ÖPNVEncode Longitude where
encode (Longitude d) = encodeGeoLength d
-- | this isn't specified anywhere, but seems to be what VDV 452 implies
instance ÖPNVEncode a => ÖPNVEncode (Maybe a) where
encode (Just a) = encode a
encode Nothing = "0"
instance ÖPNVEncode Bool where
encode False = "0"
encode True = "1"
data ÖPNVBefehl =
MOD | SRC | CHS | VER | IFV
| DVE | FFT | TBL | ATR | FRM
| REC | END | EOF | COM
deriving Show
instance ÖPNVEncode ÖPNVBefehl where
encode MOD = "mod"
encode SRC = "src"
encode CHS = "chs"
encode VER = "ver"
encode IFV = "ifv"
encode DVE = "dve"
encode FFT = "fft"
encode TBL = "tbl"
encode ATR = "atr"
encode FRM = "frm"
encode REC = "rec"
encode END = "end"
encode EOF = "eof"
encode COM = "com"
data ÖPNVType =
ÖChar Int | ÖNum Int
deriving Show
instance ÖPNVEncode ÖPNVType where
encode (ÖChar n) = "char["+|n|+"]"
encode (ÖNum n) = "num["+|n|+".0]"
class ÖPNVDatum a where
tableName :: Proxy a -> ByteString
tableNumber :: Proxy a -> Int
tableSchema :: Proxy a -> [(ByteString, ÖPNVType, a -> Feld)]
encodeRow :: forall a. ÖPNVDatum a => a -> [Feld]
encodeRow a = fmap (\f -> f a) accessors
where accessors = fmap (\(_,_,a) -> a) (tableSchema (Proxy @a))
tableInfo :: ÖPNVDatum a => Proxy a -> [(ByteString, ÖPNVType)]
tableInfo proxy = fmap (\(n, ty, _) -> (n, ty)) (tableSchema proxy)
data Feld = forall a. ÖPNVEncode a => F a | Raw ByteString
data ÖPNVOptions = ÖPNVOptions
{ öpnvSource :: Text
, öpnvProgramVersion :: Text
, öpnvDataVersion :: Text
} deriving Show
öpnvSchnittstellenDaten :: forall a. ÖPNVDatum a => ÖPNVOptions -> UTCTime -> Vector a -> LB.ByteString
öpnvSchnittstellenDaten ÖPNVOptions{..} time rows = LB.intercalate "\n" $ fmap mkRow
[ [F MOD, Raw "DD.MM.YYYY", Raw "HH:MM:SS", Raw "free"]
, [F SRC, F öpnvSource, F (utctDay time), F (utctDayTime time) ]
, [F CHS, F ("ISO8859-1" :: Text)]
, [F VER, F öpnvProgramVersion]
, [F IFV, F ("1.0" :: Text)]
, [F DVE, F öpnvDataVersion]
, [F FFT, F ("" :: Text)] -- this one is probably not needed?
, [F TBL, Raw (tableName (Proxy @a))]
, F ATR : fmap Raw colNames
, F FRM : fmap F colTypes]
<> fmap (mkRow . (:) (F REC) . encodeRow) (V.toList rows)
<> fmap mkRow
[ [F END, F (length rows)]
, [F EOF, Raw "1"]]
where
mkRow :: [Feld] -> LB.ByteString
mkRow = LB.fromStrict
. C8.intercalate "; "
. fmap (\case { (F a) -> encode a; Raw a -> a })
(colNames, colTypes) = unzip (tableInfo (Proxy @a))
öpnvSchnittstellenDatei :: forall a. ÖPNVDatum a => ÖPNVOptions -> UTCTime -> Vector a -> (FilePath, LB.ByteString)
öpnvSchnittstellenDatei options time rows = (filename, content)
where content = öpnvSchnittstellenDaten options time rows
filename = "i"+|tableNumber (Proxy @a)|+""+|dayOfYearPadded|+"0.x10"
dayOfYearPadded =
replicate (3 - length (show dayOfYear)) '0' <> show dayOfYear
(year, month, day) = toGregorian (utctDay time)
dayOfYear = monthAndDayToDayOfYear
(isLeapYear year) month day
data ÖPNVTable = forall a. ÖPNVDatum a => ÖPNVTable (Vector a)
öpnvSchnittstellenZip :: ÖPNVOptions -> UTCTime -> [ÖPNVTable] -> Archive
öpnvSchnittstellenZip options time tables =
foldl addTableEntry emptyArchive tables
where unixt = 0 -- nominalDiffTimeToSeconds (utcTimeToPOSIXSeconds time)
addTableEntry archive (ÖPNVTable t) =
addEntryToArchive (toEntry filename unixt content) archive
where (filename,content) = öpnvSchnittstellenDatei options time t
crop n thing = if T.length shown < n
then T.replicate (n - T.length shown) "0" <> shown
else T.takeEnd n shown
where shown = T.pack $ show thing
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