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 Prelude (error)
  25 import qualified Data.Algorithms.KMP as KMP
  26 import qualified Data.IntMap.Strict  as IntMap
  27 import qualified Data.List           as List
  28 ------------------------------------------------------------------------
  29
  30 data Pattern = Pattern
  31   { _pat_table  :: !(KMP.Table Text)
  32   , _pat_length :: !Int
  33   , _pat_terms  :: ![Text]
  34   }
  35 type Patterns = [Pattern]
  36
  37 ------------------------------------------------------------------------
  38 replaceTerms :: Patterns -> [Text] -> [[Text]]
  39 replaceTerms pats terms = go 0
  40   where
  41     terms_len = length terms
  42
  43     go ix | ix >= terms_len = []
  44           | otherwise =
  45       case IntMap.lookup ix m of
  46         Nothing -> go (ix + 1)
  47         Just (len, term) ->
  48           term : go (ix + len)
  49
  50
  51     merge (len1, lab1) (len2, lab2) =
  52       if len2 < len1 then (len1, lab1) else (len2, lab2)
  53
  54     m =
  55       IntMap.fromListWith merge
  56         [ (ix, (len, term))
  57         | Pattern pat len term <- pats, ix <- KMP.match pat terms ]
  58
  59 buildPatterns :: TermList -> Patterns
  60 buildPatterns = sortWith (Down . _pat_length) . concatMap buildPattern
  61   where
  62     buildPattern (label, alts) = map f (label : alts)
  63       where
  64         f alt | "" `elem` alt = error "buildPatterns: ERR1"
  65               | null alt      = error "buildPatterns: ERR2"
  66               | otherwise     =
  67                 Pattern (KMP.build alt) (length alt) label
  68                         --(Terms label $ Set.empty) -- TODO check stems
  69
  70
  71 --------------------------------------------------------------------------
  72 -- Utils
  73 type BlockText   = Text
  74 type MatchedText = Text
  75 termsInText :: Patterns -> BlockText -> [MatchedText]
  76 termsInText pats txt = List.nub
  77                      $ List.concat
  78                      $ map (map unwords)
  79                      $ extractTermsWithList pats txt
  80
  81 --------------------------------------------------------------------------
  82
  83 extractTermsWithList :: Patterns -> Text -> Corpus [Text]
  84 extractTermsWithList pats = map (replaceTerms pats) . monoTextsBySentence
  85
  86 -- | Extract terms
  87 -- >>> let termList = [(["chat blanc"], [["chat","blanc"]])] :: TermList
  88 -- extractTermsWithList' (buildPatterns termList) "Le chat blanc"["chat blanc"]
  89 -- ["chat blanc"]
  90 extractTermsWithList' :: Patterns -> Text -> [Text]
  91 extractTermsWithList' pats = map (concat . map concat . replaceTerms pats)
  92                            . monoTextsBySentence
  93
  94 --------------------------------------------------------------------------
  95
  96 {- | Not used
  97 filterWith :: TermList
  98            -> (a -> Text)
  99            -> [a]
 100            -> [(a, [Text])]
 101 filterWith termList f xs = filterWith' termList f zip xs
 102
 103
 104 filterWith' :: TermList
 105            -> (a -> Text)
 106            -> ([a] -> [[Text]] -> [b])
 107            -> [a]
 108            -> [b]
 109 filterWith' termList f f' xs = f' xs
 110                             $ map (extractTermsWithList' pats)
 111                             $ map f xs
 112     where
 113       pats = buildPatterns termList
 114 -}