aboutsummaryrefslogtreecommitdiff
path: root/src/Text/Pandoc/Readers/Docx/Lists.hs
blob: eb24640c5aade48ce5e5c5a36912a05fd401ecd8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{- |
   Module      : Text.Pandoc.Readers.Docx.Lists
   Copyright   : Copyright (C) 2014-2019 Jesse Rosenthal
   License     : GNU GPL, version 2 or above

   Maintainer  : Jesse Rosenthal <jrosenthal@jhu.edu>
   Stability   : alpha
   Portability : portable

Functions for converting flat docx paragraphs into nested lists.
-}

module Text.Pandoc.Readers.Docx.Lists ( blocksToBullets
                                      , blocksToDefinitions
                                      , listParagraphDivs
                                      , listParagraphStyles
                                      ) where

import Prelude
import Data.List
import Data.Maybe
import Data.String (fromString)
import Text.Pandoc.Generic (bottomUp)
import Text.Pandoc.JSON
import Text.Pandoc.Readers.Docx.Parse (ParaStyleName)
import Text.Pandoc.Shared (trim, safeRead)

isListItem :: Block -> Bool
isListItem (Div (_, classes, _) _) | "list-item" `elem` classes = True
isListItem _                       = False

getLevel :: Block -> Maybe Integer
getLevel (Div (_, _, kvs) _) =  lookup "level" kvs >>= safeRead
getLevel _                   = Nothing

getLevelN :: Block -> Integer
getLevelN b = fromMaybe (-1) (getLevel b)

getNumId :: Block -> Maybe Integer
getNumId (Div (_, _, kvs) _) =  lookup "num-id" kvs >>= safeRead
getNumId _                   = Nothing

getNumIdN :: Block -> Integer
getNumIdN b = fromMaybe (-1) (getNumId b)

getText :: Block -> Maybe String
getText (Div (_, _, kvs) _) = lookup "text" kvs
getText _                   = Nothing

data ListType = Itemized | Enumerated ListAttributes

listStyleMap :: [(String, ListNumberStyle)]
listStyleMap = [("upperLetter", UpperAlpha),
                ("lowerLetter", LowerAlpha),
                ("upperRoman", UpperRoman),
                ("lowerRoman", LowerRoman),
                ("decimal", Decimal)]

listDelimMap :: [(String, ListNumberDelim)]
listDelimMap = [("%1)", OneParen),
                ("(%1)", TwoParens),
                ("%1.", Period)]

getListType :: Block -> Maybe ListType
getListType b@(Div (_, _, kvs) _) | isListItem b =
  let
    start = lookup "start" kvs
    frmt = lookup "format" kvs
    txt  = lookup "text" kvs
  in
   case frmt of
     Just "bullet" -> Just Itemized
     Just f        ->
       case txt of
         Just t -> Just $ Enumerated (
                  fromMaybe 1 (start >>= safeRead) :: Int,
                  fromMaybe DefaultStyle (lookup f listStyleMap),
                  fromMaybe DefaultDelim (lookup t listDelimMap))
         Nothing -> Nothing
     _ -> Nothing
getListType _ = Nothing

listParagraphDivs :: [String]
listParagraphDivs = ["list-paragraph"]

listParagraphStyles :: [ParaStyleName]
listParagraphStyles = map fromString listParagraphDivs

-- This is a first stab at going through and attaching meaning to list
-- paragraphs, without an item marker, following a list item. We
-- assume that these are paragraphs in the same item.

handleListParagraphs :: [Block] -> [Block]
handleListParagraphs [] = []
handleListParagraphs (
  Div attr1@(_, classes1, _) blks1 :
  Div (ident2, classes2, kvs2) blks2 :
  blks
  ) | "list-item" `elem` classes1 &&
    notElem "list-item" classes2 &&
    (not . null) (listParagraphDivs `intersect` classes2) =
      -- We don't want to keep this indent.
      let newDiv2 =
            Div (ident2, classes2, filter (\kv -> fst kv /= "indent") kvs2) blks2
      in
       handleListParagraphs (Div attr1 (blks1 ++ [newDiv2]) : blks)
handleListParagraphs (blk:blks) = blk : handleListParagraphs blks

separateBlocks' :: Block -> [[Block]] -> [[Block]]
separateBlocks' blk [[]] = [[blk]]
separateBlocks' b@(BulletList _) acc = init acc ++ [last acc ++ [b]]
separateBlocks' b@(OrderedList _ _) acc = init acc ++ [last acc ++ [b]]
-- The following is for the invisible bullet lists. This is how
-- pandoc-generated ooxml does multiparagraph item lists.
separateBlocks' b acc | fmap trim (getText b) == Just "" =
  init acc ++ [last acc ++ [b]]
separateBlocks' b acc = acc ++ [[b]]

separateBlocks :: [Block] -> [[Block]]
separateBlocks blks = foldr separateBlocks' [[]] (reverse blks)

flatToBullets' :: Integer -> [Block] -> [Block]
flatToBullets' _ [] = []
flatToBullets' num xs@(b : elems)
  | getLevelN b == num = b : flatToBullets' num elems
  | otherwise =
    let bNumId = getNumIdN b
        bLevel = getLevelN b
        (children, remaining) =
          span
          (\b' ->
            getLevelN b' > bLevel ||
             (getLevelN b' == bLevel && getNumIdN b' == bNumId))
          xs
    in
     case getListType b of
       Just (Enumerated attr) ->
         OrderedList attr (separateBlocks $ flatToBullets' bLevel children) :
         flatToBullets' num remaining
       _ ->
         BulletList (separateBlocks $ flatToBullets' bLevel children) :
         flatToBullets' num remaining

flatToBullets :: [Block] -> [Block]
flatToBullets elems = flatToBullets' (-1) elems

singleItemHeaderToHeader :: Block -> Block
singleItemHeaderToHeader (OrderedList _ [[h@Header{}]]) = h
singleItemHeaderToHeader blk                            = blk


blocksToBullets :: [Block] -> [Block]
blocksToBullets blks =
  map singleItemHeaderToHeader $
  bottomUp removeListDivs $flatToBullets (handleListParagraphs blks)

plainParaInlines :: Block -> [Inline]
plainParaInlines (Plain ils) = ils
plainParaInlines (Para ils)  = ils
plainParaInlines _           = []

blocksToDefinitions' :: [([Inline], [[Block]])] -> [Block] -> [Block] -> [Block]
blocksToDefinitions' []     acc [] = reverse acc
blocksToDefinitions' defAcc acc [] =
  reverse $ DefinitionList (reverse defAcc) : acc
blocksToDefinitions' defAcc acc
  (Div (_, classes1, _) blks1 : Div (ident2, classes2, kvs2) blks2 : blks)
  | "Definition-Term" `elem` classes1 && "Definition"  `elem` classes2 =
    let remainingAttr2 = (ident2, delete "Definition" classes2, kvs2)
        pair = if remainingAttr2 == ("", [], []) then (concatMap plainParaInlines blks1, [blks2]) else (concatMap plainParaInlines blks1, [[Div remainingAttr2 blks2]])
    in
     blocksToDefinitions' (pair : defAcc) acc blks
blocksToDefinitions' ((defTerm, defItems):defs) acc
  (Div (ident2, classes2, kvs2) blks2 : blks)
  | "Definition"  `elem` classes2 =
    let remainingAttr2 = (ident2, delete "Definition" classes2, kvs2)
        defItems2 = if remainingAttr2 == ("", [], [])
          then blks2
          else [Div remainingAttr2 blks2]
        defAcc' = if null defItems
          then (defTerm, [defItems2]) : defs
          else (defTerm, init defItems ++ [last defItems ++ defItems2]) : defs
    in
     blocksToDefinitions' defAcc' acc blks
blocksToDefinitions' [] acc (b:blks) =
  blocksToDefinitions' [] (b:acc) blks
blocksToDefinitions' defAcc acc (b:blks) =
  blocksToDefinitions' [] (b : DefinitionList (reverse defAcc) : acc) blks

removeListDivs' :: Block -> [Block]
removeListDivs' (Div (ident, classes, kvs) blks)
  | "list-item" `elem` classes =
    case delete "list-item" classes of
      []       -> blks
      classes' -> [Div (ident, classes', kvs) blks]
removeListDivs' (Div (ident, classes, kvs) blks)
  | not $ null $ listParagraphDivs `intersect` classes =
    case classes \\ listParagraphDivs of
      []       -> blks
      classes' -> [Div (ident, classes', kvs) blks]
removeListDivs' blk = [blk]

removeListDivs :: [Block] -> [Block]
removeListDivs = concatMap removeListDivs'

blocksToDefinitions :: [Block] -> [Block]
blocksToDefinitions = blocksToDefinitions' [] []