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module Parser.Utils
( getTagsBefore
, getTagsAfter
, getTagsBetween
, getTagAttributes
, getTagAttribute
, getTagTextAfter
) where
import Data.List (find, findIndex)
import Data.Maybe (catMaybes, listToMaybe)
import Data.Text (Text)
import qualified Data.Text as T
import Text.HTML.TagSoup
getTagsBefore :: Text -> [Tag Text] -> [Tag Text]
getTagsBefore selector = takeWhile (~/= (T.unpack selector))
getTagsAfter :: Text -> [Tag Text] -> [Tag Text]
getTagsAfter selector = drop 1 . dropWhile (~/= (T.unpack selector))
getTagsBetween :: Text -> Text -> [Tag Text] -> [Tag Text]
getTagsBetween begin end = getTagsBefore end . getTagsAfter begin
getTagAttributes :: Text -> Text -> [Tag Text] -> [Text]
getTagAttributes selector attribute =
catMaybes
. fmap (maybeTagAttribute attribute)
. filter (~== (T.unpack selector))
getTagAttribute :: Text -> Text -> [Tag Text] -> Maybe Text
getTagAttribute selector attribute =
listToMaybe
. getTagAttributes selector attribute
getTagTextAfter :: Text -> [Tag Text] -> Maybe Text
getTagTextAfter selector tags =
case findIndex (~== (T.unpack selector)) tags of
Just index -> fmap T.strip $ safeGetAt (index + 1) tags >>= maybeTagText
Nothing -> Nothing
maybeTagAttribute :: Text -> Tag Text -> Maybe Text
maybeTagAttribute name (TagOpen _ xs) =
fmap snd . find (\(x, _) -> x == name) $ xs
maybeTagAttribute _ _ = Nothing
safeGetAt :: Int -> [a] -> Maybe a
safeGetAt index = listToMaybe . drop index
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