src/Data/Gargantext/Ngrams/Occurrences.hs

   1 {-# LANGUAGE OverloadedStrings #-}
   2
   3 module Data.Gargantext.Ngrams.Occurrences where
   4
   5 import Data.Attoparsec.Text
   6 import Data.Text (Text)
   7
   8
   9 import Data.Either.Extra(Either(..))
  10 import qualified Data.Text as T
  11 import Control.Applicative
  12
  13 occurrenceParser :: Text -> Parser Bool
  14 occurrenceParser txt = manyTill anyChar (string txt) >> pure True
  15
  16 occurrencesParser :: Text -> Parser Int
  17 occurrencesParser txt = case txt of
  18                     "" -> pure 0
  19                     _  -> many (occurrenceParser txt') >>= \matches -> pure (length matches)
  20     where
  21         txt' = T.toLower txt
  22
  23 parseOccurrences :: Text -> Text -> Either String Int
  24 parseOccurrences x = parseOnly (occurrencesParser x)