src/Gargantext/Text/Context.hs

   1 {-|
   2 Module      : Gargantext.Text.Context
   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 Context of text management tool, here are logic of main types.
  11
  12 -}
  13
  14 {-# LANGUAGE NoImplicitPrelude #-}
  15 {-# LANGUAGE OverloadedStrings #-}
  16
  17 module Gargantext.Text.Context
  18   where
  19
  20 import Data.Text (Text, pack, unpack)
  21 import Data.String (IsString)
  22
  23 import Text.HTML.TagSoup (parseTags, isTagText, Tag(..))
  24 import Gargantext.Text
  25 import Gargantext.Prelude hiding (length)
  26
  27
  28 ------------------------------------------------------------------------
  29
  30 type Term = Text
  31 type Label = Term
  32
  33 type Sentence  a = [a] -- or a nominal group
  34 type Corpus    a = [Sentence a] -- a list of sentences
  35
  36 -- type ConText a = [Sentence a]
  37 -- type Corpus a = [ConText a]
  38
  39
  40 ------------------------------------------------------------------------
  41
  42 data SplitContext = Chars Int | Sentences Int | Paragraphs Int
  43
  44 tag :: Text -> [Tag Text]
  45 tag = parseTags
  46
  47 -- | splitBy contexts of Chars or Sentences or Paragraphs
  48 -- >> splitBy (Chars 0) "abcde"
  49 -- ["a","b","c","d","e"]
  50 -- >> splitBy (Chars 1) "abcde"
  51 -- ["ab","bc","cd","de"]
  52 -- >> splitBy (Chars 2) "abcde"
  53 -- ["abc","bcd","cde"]
  54 splitBy :: SplitContext -> Text -> [Text]
  55 splitBy (Chars     n)  = map pack        . chunkAlong (n+1) 1 . unpack
  56 splitBy (Sentences n)  = map unsentences . chunkAlong (n+1) 1 . sentences
  57 splitBy (Paragraphs _) = map unTag       . filter isTagText   . tag
  58   where
  59     unTag :: IsString p => Tag p -> p
  60     unTag (TagText x) = x
  61     unTag _           = ""
  62
  63