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|
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE PatternGuards #-}
{-# LANGUAGE TypeSynonymInstances #-}
module Text.Pandoc.Readers.Docx.Combine ( smushInlines
, smushBlocks
)
where
import Data.List
import Data.Sequence (ViewL (..), ViewR (..), viewl, viewr, (><), (|>))
import qualified Data.Sequence as Seq (null)
import Text.Pandoc.Builder
data Modifier a = Modifier (a -> a)
| AttrModifier (Attr -> a -> a) Attr
| NullModifier
spaceOutInlinesL :: Inlines -> (Inlines, Inlines)
spaceOutInlinesL ms = (l, stackInlines fs (m' <> r))
where (l, m, r) = spaceOutInlines ms
(fs, m') = unstackInlines m
spaceOutInlinesR :: Inlines -> (Inlines, Inlines)
spaceOutInlinesR ms = (stackInlines fs (l <> m'), r)
where (l, m, r) = spaceOutInlines ms
(fs, m') = unstackInlines m
spaceOutInlines :: Inlines -> (Inlines, Inlines, Inlines)
spaceOutInlines ils =
let (fs, ils') = unstackInlines ils
contents = unMany ils'
left = case viewl contents of
(Space :< _) -> space
_ -> mempty
right = case viewr contents of
(_ :> Space) -> space
_ -> mempty in
(left, stackInlines fs $ trimInlines . Many $ contents, right)
stackInlines :: [Modifier Inlines] -> Inlines -> Inlines
stackInlines [] ms = ms
stackInlines (NullModifier : fs) ms = stackInlines fs ms
stackInlines (Modifier f : fs) ms =
if isEmpty ms
then stackInlines fs ms
else f $ stackInlines fs ms
stackInlines (AttrModifier f attr : fs) ms = f attr $ stackInlines fs ms
unstackInlines :: Inlines -> ([Modifier Inlines], Inlines)
unstackInlines ms = case ilModifier ms of
NullModifier -> ([], ms)
_ -> (f : fs, ms') where
f = ilModifier ms
(fs, ms') = unstackInlines $ ilInnards ms
ilModifier :: Inlines -> Modifier Inlines
ilModifier ils = case viewl (unMany ils) of
(x :< xs) | Seq.null xs -> case x of
(Emph _) -> Modifier emph
(Strong _) -> Modifier strong
(SmallCaps _) -> Modifier smallcaps
(Strikeout _) -> Modifier strikeout
(Superscript _) -> Modifier superscript
(Subscript _) -> Modifier subscript
(Link attr _ tgt) -> Modifier $ linkWith attr (fst tgt) (snd tgt)
(Span attr _) -> AttrModifier spanWith attr
_ -> NullModifier
_ -> NullModifier
ilInnards :: Inlines -> Inlines
ilInnards ils = case viewl (unMany ils) of
(x :< xs) | Seq.null xs -> case x of
(Emph lst) -> fromList lst
(Strong lst) -> fromList lst
(SmallCaps lst) -> fromList lst
(Strikeout lst) -> fromList lst
(Superscript lst) -> fromList lst
(Subscript lst) -> fromList lst
(Link _ lst _) -> fromList lst
(Span _ lst) -> fromList lst
_ -> ils
_ -> ils
inlinesL :: Inlines -> (Inlines, Inlines)
inlinesL ils = case viewl $ unMany ils of
(s :< sq) -> (singleton s, Many sq)
_ -> (mempty, ils)
inlinesR :: Inlines -> (Inlines, Inlines)
inlinesR ils = case viewr $ unMany ils of
(sq :> s) -> (Many sq, singleton s)
_ -> (ils, mempty)
combineInlines :: Inlines -> Inlines -> Inlines
combineInlines x y =
let (xs', x') = inlinesR x
(y', ys') = inlinesL y
in
xs' <> combineSingletonInlines x' y' <> ys'
combineSingletonInlines :: Inlines -> Inlines -> Inlines
combineSingletonInlines x y =
let (xfs, xs) = unstackInlines x
(yfs, ys) = unstackInlines y
shared = xfs `intersect` yfs
x_remaining = xfs \\ shared
y_remaining = yfs \\ shared
x_rem_attr = filter isAttrModifier x_remaining
y_rem_attr = filter isAttrModifier y_remaining
in
case null shared of
True | isEmpty xs && isEmpty ys ->
stackInlines (x_rem_attr ++ y_rem_attr) mempty
| isEmpty xs ->
let (sp, y') = spaceOutInlinesL y in
stackInlines x_rem_attr mempty <> sp <> y'
| isEmpty ys ->
let (x', sp) = spaceOutInlinesR x in
x' <> sp <> stackInlines y_rem_attr mempty
| otherwise ->
let (x', xsp) = spaceOutInlinesR x
(ysp, y') = spaceOutInlinesL y
in
x' <> xsp <> ysp <> y'
False -> stackInlines shared $
combineInlines
(stackInlines x_remaining xs)
(stackInlines y_remaining ys)
combineBlocks :: Blocks -> Blocks -> Blocks
combineBlocks bs cs
| bs' :> BlockQuote bs'' <- viewr (unMany bs)
, BlockQuote cs'' :< cs' <- viewl (unMany cs) =
Many $ (bs' |> BlockQuote (bs'' <> cs'')) >< cs'
combineBlocks bs cs = bs <> cs
instance (Monoid a, Eq a) => Eq (Modifier a) where
(Modifier f) == (Modifier g) = f mempty == g mempty
(AttrModifier f attr) == (AttrModifier g attr') = f attr mempty == g attr' mempty
NullModifier == NullModifier = True
_ == _ = False
isEmpty :: (Monoid a, Eq a) => a -> Bool
isEmpty x = x == mempty
isAttrModifier :: Modifier a -> Bool
isAttrModifier (AttrModifier _ _) = True
isAttrModifier _ = False
smushInlines :: [Inlines] -> Inlines
smushInlines xs = foldl combineInlines mempty xs
smushBlocks :: [Blocks] -> Blocks
smushBlocks xs = foldl combineBlocks mempty xs
|
