src/Gargantext/Core/Text/Terms/WithList.hs

   1 {-|
   2 Module      : Gargantext.Core.Text.Terms.WithList
   3 Description :
   4 Copyright   : (c) CNRS, 2017-Present
   5 License     : AGPL + CECILL v3
   6 Maintainer  : team@gargantext.org
   7 Stability   : experimental
   8 Portability : POSIX
   9
  10 Here is a longer description of this module, containing some
  11 commentary with @some markup@.
  12
  13 -}
  14 {-# LANGUAGE BangPatterns      #-}
  15
  16 module Gargantext.Core.Text.Terms.WithList where
  17
  18 import Data.List (null)
  19 import Data.Ord
  20 import Data.Text (Text, concat, unwords)
  21 import Gargantext.Prelude
  22 import Gargantext.Core.Text.Context
  23 import Gargantext.Core.Text.Terms.Mono (monoTextsBySentence)
  24 import Gargantext.Core.Types (TermsCount)
  25 import Gargantext.Core.Utils (groupWithCounts)
  26 import Prelude (error)
  27 import qualified Data.Algorithms.KMP as KMP
  28 import qualified Data.IntMap.Strict  as IntMap
  29 import qualified Data.List           as List
  30 ------------------------------------------------------------------------
  31
  32 data Pattern = Pattern
  33   { _pat_table  :: !(KMP.Table Text)
  34   , _pat_length :: !Int
  35   , _pat_terms  :: ![Text]
  36   }
  37 type Patterns = [Pattern]
  38
  39 ------------------------------------------------------------------------
  40 replaceTerms :: Patterns -> [Text] -> [[Text]]
  41 replaceTerms pats terms = go 0
  42   where
  43     terms_len = length terms
  44
  45     go ix | ix >= terms_len = []
  46           | otherwise =
  47       case IntMap.lookup ix m of
  48         Nothing -> go (ix + 1)
  49         Just (len, term) ->
  50           term : go (ix + len)
  51
  52
  53     merge (len1, lab1) (len2, lab2) =
  54       if len2 < len1 then (len1, lab1) else (len2, lab2)
  55
  56     m =
  57       IntMap.fromListWith merge
  58         [ (ix, (len, term))
  59         | Pattern pat len term <- pats, ix <- KMP.match pat terms ]
  60
  61 buildPatterns :: TermList -> Patterns
  62 buildPatterns = sortWith (Down . _pat_length) . concatMap buildPattern
  63   where
  64     buildPattern (label, alts) = map f $ map (\alt -> filter (/= "") alt) (label : alts)
  65       where
  66         f alt | "" `elem` alt = error ("buildPatterns: ERR1" <> show(label))
  67               | null alt      = error "buildPatterns: ERR2"
  68               | otherwise     =
  69                 Pattern (KMP.build alt) (length alt) label
  70                         --(Terms label $ Set.empty) -- TODO check stems
  71
  72
  73 --------------------------------------------------------------------------
  74 -- Utils
  75 type MatchedText = Text
  76 termsInText :: Patterns -> Text -> [(MatchedText, TermsCount)]
  77 termsInText pats txt = groupWithCounts
  78                      $ List.concat
  79                      $ map (map unwords)
  80                      $ extractTermsWithList pats txt
  81
  82 --------------------------------------------------------------------------
  83
  84 extractTermsWithList :: Patterns -> Text -> Corpus [Text]
  85 extractTermsWithList pats = map (replaceTerms pats) . monoTextsBySentence
  86
  87 -- | Extract terms
  88 -- >>> let termList = [(["chat blanc"], [["chat","blanc"]])] :: TermList
  89 -- extractTermsWithList' (buildPatterns termList) "Le chat blanc"["chat blanc"]
  90 -- ["chat blanc"]
  91 extractTermsWithList' :: Patterns -> Text -> [Text]
  92 extractTermsWithList' pats = map (concat . map concat . replaceTerms pats)
  93                            . monoTextsBySentence
  94
  95 --------------------------------------------------------------------------
  96
  97 {- | Not used
  98 filterWith :: TermList
  99            -> (a -> Text)
 100            -> [a]
 101            -> [(a, [Text])]
 102 filterWith termList f xs = filterWith' termList f zip xs
 103
 104
 105 filterWith' :: TermList
 106            -> (a -> Text)
 107            -> ([a] -> [[Text]] -> [b])
 108            -> [a]
 109            -> [b]
 110 filterWith' termList f f' xs = f' xs
 111                             $ map (extractTermsWithList' pats)
 112                             $ map f xs
 113     where
 114       pats = buildPatterns termList
 115 -}