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|
{- |
Module : Text.Pandoc.Readers.Haddock
Copyright : Copyright (C) 2013 David Lazar
License : GNU GPL, version 2 or above
Maintainer : David Lazar <lazar6@illinois.edu>,
John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Conversion of Haddock markup to 'Pandoc' document.
-}
module Text.Pandoc.Readers.Haddock
( readHaddock
) where
import Text.Pandoc.Builder (Blocks, Inlines)
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Shared (trim, splitBy)
import Data.Monoid
import Data.List (intersperse, stripPrefix)
import Data.Maybe (fromMaybe)
import Text.Pandoc.Definition
import Text.Pandoc.Options
import Documentation.Haddock.Parser
import Documentation.Haddock.Types
import Debug.Trace (trace)
-- | Parse Haddock markup and return a 'Pandoc' document.
readHaddock :: ReaderOptions -- ^ Reader options
-> String -- ^ String to parse
-> Pandoc
readHaddock opts = B.doc . docHToBlocks . trace' . parseParas
where trace' x = if readerTrace opts
then trace (show x) x
else x
docHToBlocks :: DocH String Identifier -> Blocks
docHToBlocks d' =
case d' of
DocEmpty -> mempty
DocAppend (DocParagraph (DocHeader h)) (DocParagraph (DocAName ident)) ->
B.headerWith (ident,[],[]) (headerLevel h)
(docHToInlines False $ headerTitle h)
DocAppend d1 d2 -> mappend (docHToBlocks d1) (docHToBlocks d2)
DocString _ -> inlineFallback
DocParagraph (DocAName h) -> B.plain $ docHToInlines False $ DocAName h
DocParagraph x -> B.para $ docHToInlines False x
DocIdentifier _ -> inlineFallback
DocIdentifierUnchecked _ -> inlineFallback
DocModule s -> B.plain $ docHToInlines False $ DocModule s
DocWarning _ -> mempty -- TODO
DocEmphasis _ -> inlineFallback
DocMonospaced _ -> inlineFallback
DocBold _ -> inlineFallback
DocHeader h -> B.header (headerLevel h)
(docHToInlines False $ headerTitle h)
DocUnorderedList items -> B.bulletList (map docHToBlocks items)
DocOrderedList items -> B.orderedList (map docHToBlocks items)
DocDefList items -> B.definitionList (map (\(d,t) ->
(docHToInlines False d,
[consolidatePlains $ docHToBlocks t])) items)
DocCodeBlock (DocString s) -> B.codeBlockWith ("",[],[]) s
DocCodeBlock d -> B.para $ docHToInlines True d
DocHyperlink _ -> inlineFallback
DocPic _ -> inlineFallback
DocAName _ -> inlineFallback
DocProperty s -> B.codeBlockWith ("",["property","haskell"],[]) (trim s)
DocExamples es -> mconcat $ map (\e ->
makeExample ">>>" (exampleExpression e) (exampleResult e)) es
where inlineFallback = B.plain $ docHToInlines False d'
consolidatePlains = B.fromList . consolidatePlains' . B.toList
consolidatePlains' zs@(Plain _ : _) =
let (xs, ys) = span isPlain zs in
Para (concatMap extractContents xs) : consolidatePlains' ys
consolidatePlains' (x : xs) = x : consolidatePlains' xs
consolidatePlains' [] = []
isPlain (Plain _) = True
isPlain _ = False
extractContents (Plain xs) = xs
extractContents _ = []
docHToInlines :: Bool -> DocH String Identifier -> Inlines
docHToInlines isCode d' =
case d' of
DocEmpty -> mempty
DocAppend d1 d2 -> mappend (docHToInlines isCode d1)
(docHToInlines isCode d2)
DocString s
| isCode -> mconcat $ intersperse B.linebreak
$ map B.code $ splitBy (=='\n') s
| otherwise -> B.text s
DocParagraph _ -> mempty
DocIdentifier (_,s,_) -> B.codeWith ("",["haskell","identifier"],[]) s
DocIdentifierUnchecked s -> B.codeWith ("",["haskell","identifier"],[]) s
DocModule s -> B.codeWith ("",["haskell","module"],[]) s
DocWarning _ -> mempty -- TODO
DocEmphasis d -> B.emph (docHToInlines isCode d)
DocMonospaced (DocString s) -> B.code s
DocMonospaced d -> docHToInlines True d
DocBold d -> B.strong (docHToInlines isCode d)
DocHeader _ -> mempty
DocUnorderedList _ -> mempty
DocOrderedList _ -> mempty
DocDefList _ -> mempty
DocCodeBlock _ -> mempty
DocHyperlink h -> B.link (hyperlinkUrl h) (hyperlinkUrl h)
(maybe (B.text $ hyperlinkUrl h) B.text $ hyperlinkLabel h)
DocPic p -> B.image (pictureUri p) (fromMaybe (pictureUri p) $ pictureTitle p)
(maybe mempty B.text $ pictureTitle p)
DocAName s -> B.spanWith (s,["anchor"],[]) mempty
DocProperty _ -> mempty
DocExamples _ -> mempty
-- | Create an 'Example', stripping superfluous characters as appropriate
makeExample :: String -> String -> [String] -> Blocks
makeExample prompt expression result =
B.para $ B.codeWith ("",["prompt"],[]) prompt
<> B.space
<> B.codeWith ([], ["haskell","expr"], []) (trim expression)
<> B.linebreak
<> (mconcat $ intersperse B.linebreak $ map coder result')
where
-- 1. drop trailing whitespace from the prompt, remember the prefix
prefix = takeWhile (`elem` " \t") prompt
-- 2. drop, if possible, the exact same sequence of whitespace
-- characters from each result line
--
-- 3. interpret lines that only contain the string "<BLANKLINE>" as an
-- empty line
result' = map (substituteBlankLine . tryStripPrefix prefix) result
where
tryStripPrefix xs ys = fromMaybe ys $ stripPrefix xs ys
substituteBlankLine "<BLANKLINE>" = ""
substituteBlankLine line = line
coder = B.codeWith ([], ["result"], [])
|
