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{-# LANGUAGE OverloadedStrings #-}
{-
Copyright (C) 2014 Jesse Rosenthal <jrosenthal@jhu.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Readers.Docx.Reducible
Copyright : Copyright (C) 2014 Jesse Rosenthal
License : GNU GPL, version 2 or above
Maintainer : Jesse Rosenthal <jrosenthal@jhu.edu>
Stability : alpha
Portability : portable
Typeclass for combining adjacent blocks and inlines correctly.
-}
module Text.Pandoc.Readers.Docx.Reducible ((<++>),
(<+++>),
Reducible,
Container(..),
container,
innards,
reduceList,
reduceListB,
rebuild)
where
import Text.Pandoc.Builder
import Data.List ((\\), intersect)
data Container a = Container ([a] -> a) | NullContainer
instance (Eq a) => Eq (Container a) where
(Container x) == (Container y) = ((x []) == (y []))
NullContainer == NullContainer = True
_ == _ = False
instance (Show a) => Show (Container a) where
show (Container x) = "Container {" ++
(reverse $ drop 3 $ reverse $ show $ x []) ++
"}"
show (NullContainer) = "NullContainer"
class Reducible a where
(<++>) :: a -> a -> [a]
container :: a -> Container a
innards :: a -> [a]
isSpace :: a -> Bool
(<+++>) :: (Reducible a) => Many a -> Many a -> Many a
mr <+++> ms = fromList $ reduceList $ toList mr ++ toList ms
reduceListB :: (Reducible a) => Many a -> Many a
reduceListB = fromList . reduceList . toList
reduceList' :: (Reducible a) => [a] -> [a] -> [a]
reduceList' acc [] = acc
reduceList' [] (x:xs) = reduceList' [x] xs
reduceList' as (x:xs) = reduceList' (init as ++ (last as <++> x) ) xs
reduceList :: (Reducible a) => [a] -> [a]
reduceList = reduceList' []
combineReducibles :: (Reducible a, Eq a) => a -> a -> [a]
combineReducibles r s =
let (conts, rs) = topLevelContainers r
(conts', ss) = topLevelContainers s
shared = conts `intersect` conts'
remaining = conts \\ shared
remaining' = conts' \\ shared
in
case null shared of
True -> case () of
_ | (not . null) rs && isSpace (last rs) ->
rebuild conts (init rs) ++ [last rs, s]
_ | (not . null) ss && isSpace (head ss) ->
[r, head ss] ++ rebuild conts' (tail ss)
_ -> [r,s]
False -> rebuild
shared $
reduceList $
(rebuild remaining rs) ++ (rebuild remaining' ss)
instance Reducible Inline where
s1@(Span (id1, classes1, kvs1) ils1) <++> s2@(Span (id2, classes2, kvs2) ils2) =
let classes' = classes1 `intersect` classes2
kvs' = kvs1 `intersect` kvs2
classes1' = classes1 \\ classes'
kvs1' = kvs1 \\ kvs'
classes2' = classes2 \\ classes'
kvs2' = kvs2 \\ kvs'
in
case null classes' && null kvs' of
True -> [s1,s2]
False -> let attr' = ("", classes', kvs')
attr1' = (id1, classes1', kvs1')
attr2' = (id2, classes2', kvs2')
s1' = case null classes1' && null kvs1' of
True -> ils1
False -> [Span attr1' ils1]
s2' = case null classes2' && null kvs2' of
True -> ils2
False -> [Span attr2' ils2]
in
[Span attr' $ reduceList $ s1' ++ s2']
(Str x) <++> (Str y) = [Str (x++y)]
il <++> il' = combineReducibles il il'
container (Emph _) = Container Emph
container (Strong _) = Container Strong
container (Strikeout _) = Container Strikeout
container (Subscript _) = Container Subscript
container (Superscript _) = Container Superscript
container (Quoted qt _) = Container $ Quoted qt
container (Cite cs _) = Container $ Cite cs
container (Span attr _) = Container $ Span attr
container _ = NullContainer
innards (Emph ils) = ils
innards (Strong ils) = ils
innards (Strikeout ils) = ils
innards (Subscript ils) = ils
innards (Superscript ils) = ils
innards (Quoted _ ils) = ils
innards (Cite _ ils) = ils
innards (Span _ ils) = ils
innards _ = []
isSpace Space = True
isSpace _ = False
instance Reducible Block where
(Div (ident, classes, kvs) blks) <++> blk | "list-item" `elem` classes =
[Div (ident, classes, kvs) (reduceList blks), blk]
blk <++> blk' = combineReducibles blk blk'
container (BlockQuote _) = Container BlockQuote
container (Div attr _) = Container $ Div attr
container _ = NullContainer
innards (BlockQuote bs) = bs
innards (Div _ bs) = bs
innards _ = []
isSpace _ = False
topLevelContainers' :: (Reducible a) => [a] -> ([Container a], [a])
topLevelContainers' (r : []) = case container r of
NullContainer -> ([], [r])
_ ->
let (conts, inns) = topLevelContainers' (innards r)
in
((container r) : conts, inns)
topLevelContainers' rs = ([], rs)
topLevelContainers :: (Reducible a) => a -> ([Container a], [a])
topLevelContainers il = topLevelContainers' [il]
rebuild :: [Container a] -> [a] -> [a]
rebuild [] xs = xs
rebuild ((Container f) : cs) xs = rebuild cs $ [f xs]
rebuild (NullContainer : cs) xs = rebuild cs $ xs
|
