src/Gargantext/Text/Terms/WithList.hs

   1 {-|
   2 Module      : Gargantext.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 NoImplicitPrelude #-}
  15 {-# LANGUAGE OverloadedStrings #-}
  16 {-# LANGUAGE BangPatterns      #-}
  17
  18 module Gargantext.Text.Terms.WithList where
  19
  20 import Data.List (null, concatMap)
  21 import Data.Ord
  22 import Data.Text (Text, concat)
  23 import Gargantext.Prelude
  24 import Gargantext.Text.Context
  25 import Gargantext.Text.Terms.Mono (monoTextsBySentence)
  26 import Prelude (error)
  27 import qualified Data.Algorithms.KMP as KMP
  28 import qualified Data.IntMap.Strict as IntMap
  29
  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 (label : alts)
  65       where
  66         f alt | "" `elem` alt = error "buildPatterns: ERR1"
  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 extractTermsWithList :: Patterns -> Text -> Corpus [Text]
  73 extractTermsWithList pats = map (replaceTerms pats) . monoTextsBySentence
  74
  75 -- | Extract terms
  76 -- >>> let termList = [(["chat blanc"], [["chat","blanc"]])] :: TermList
  77 -- extractTermsWithList' (buildPatterns termList) "Le chat blanc"["chat blanc"]
  78 -- ["chat blanc"]
  79 extractTermsWithList' :: Patterns -> Text -> [Text]
  80 extractTermsWithList' pats = map (concat . map concat . replaceTerms pats)
  81                            . monoTextsBySentence
  82
  83
  84 filterWith :: TermList
  85            -> (a -> Text)
  86            -> [a]
  87            -> [(a, [Text])]
  88 filterWith termList f xs = filterWith' termList f zip xs
  89
  90
  91 filterWith' :: TermList
  92            -> (a -> Text)
  93            -> ([a] -> [[Text]] -> [b])
  94            -> [a]
  95            -> [b]
  96 filterWith' termList f f' xs = f' xs
  97                             $ map (extractTermsWithList' pats)
  98                             $ map f xs
  99     where
 100       pats = buildPatterns termList
 101