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{-# LANGUAGE OverloadedStrings #-}
module Model.Message.Parts
( replaceParts
, getParts
) where
import Data.Maybe (listToMaybe, fromMaybe)
import Data.Text (Text)
import qualified Data.Text as T
import Text.ParserCombinators.Parsec
import Model.Json.MessagePart
replaceParts :: [Text] -> Text -> Text
replaceParts values message =
T.concat . map (replacePart values) $ getParts message
replacePart :: [Text] -> MessagePart -> Text
replacePart _ (Str str) = str
replacePart values (Order n) =
fromMaybe (T.concat ["{", T.pack (show n), "}"]) . listToMaybe . drop (n - 1) $ values
getParts :: Text -> [MessagePart]
getParts str =
case parse partsParser "" (T.unpack str) of
Right parts -> parts
Left _ -> []
partsParser :: Parser [MessagePart]
partsParser = many partParser
partParser :: Parser MessagePart
partParser =
(do _ <- string "{"; n <- read <$> many1 digit; _ <- string "}"; return (Order n))
<|> (do str <- T.pack <$> many1 (noneOf "{"); return (Str str))
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