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|
{-# LANGUAGE NoImplicitPrelude #-}
{- |
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
) where
import Prelude
import Data.List
import Data.Maybe
import Text.Pandoc.Generic (bottomUp)
import Text.Pandoc.JSON
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 = ["ListParagraph"]
-- 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)
| "DefinitionTerm" `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 = case remainingAttr2 == ("", [], []) of
True -> blks2
False -> [Div remainingAttr2 blks2]
defAcc' = case null defItems of
True -> (defTerm, [defItems2]) : defs
False -> (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' [] []
|
