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|
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{- |
Module : Text.Pandoc.Writers.Ipynb
Copyright : Copyright (C) 2019-2020 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Ipynb (Jupyter notebook JSON format) writer for pandoc.
-}
module Text.Pandoc.Writers.Ipynb ( writeIpynb )
where
import Control.Monad.State
import qualified Data.Map as M
import Data.Maybe (catMaybes, fromMaybe)
import Text.Pandoc.Options
import Text.Pandoc.Definition
import Data.Ipynb as Ipynb
import Text.Pandoc.Walk (walkM)
import qualified Text.Pandoc.Builder as B
import Text.Pandoc.Class.PandocMonad
import Text.Pandoc.Logging
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.Lazy as TL
import Data.Aeson as Aeson
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Pandoc.Shared (safeRead, isURI)
import Text.Pandoc.Writers.Shared (metaToContext')
import Text.Pandoc.Writers.Markdown (writeMarkdown)
import qualified Data.Text.Encoding as TE
import qualified Data.ByteString.Lazy as BL
import Data.Aeson.Encode.Pretty (Config(..), defConfig,
encodePretty', keyOrder, Indent(Spaces))
import Text.DocLayout (literal)
writeIpynb :: PandocMonad m => WriterOptions -> Pandoc -> m Text
writeIpynb opts d = do
notebook <- pandocToNotebook opts d
return $ TE.decodeUtf8 . BL.toStrict . encodePretty' defConfig{
confIndent = Spaces 1,
confTrailingNewline = True,
confCompare = keyOrder
[ "cells", "nbformat", "nbformat_minor",
"cell_type", "output_type",
"execution_count", "metadata",
"outputs", "source",
"data", "name", "text" ] }
$ notebook
pandocToNotebook :: PandocMonad m
=> WriterOptions -> Pandoc -> m (Notebook NbV4)
pandocToNotebook opts (Pandoc meta blocks) = do
let blockWriter bs = literal <$> writeMarkdown
opts{ writerTemplate = Nothing } (Pandoc nullMeta bs)
let inlineWriter ils = literal . T.stripEnd <$> writeMarkdown
opts{ writerTemplate = Nothing } (Pandoc nullMeta [Plain ils])
let jupyterMeta =
case lookupMeta "jupyter" meta of
Just (MetaMap m) -> Meta m
_ -> mempty
let nbformat =
case (lookupMeta "nbformat" jupyterMeta,
lookupMeta "nbformat_minor" jupyterMeta) of
(Just (MetaInlines [Str "4"]), Just (MetaInlines [Str y])) ->
case safeRead y of
Just z -> (4, z)
Nothing -> (4, 5)
_ -> (4, 5) -- write as v4.5
metadata' <- toJSON <$> metaToContext' blockWriter inlineWriter
(B.deleteMeta "nbformat" .
B.deleteMeta "nbformat_minor" $
jupyterMeta)
-- convert from a Value (JSON object) to a M.Map Text Value:
let metadata = case fromJSON metadata' of
Error _ -> mempty -- TODO warning here? shouldn't happen
Success x -> x
cells <- extractCells opts blocks
return $ Notebook{
notebookMetadata = metadata
, notebookFormat = nbformat
, notebookCells = cells }
addAttachment :: PandocMonad m
=> Inline
-> StateT (M.Map Text MimeBundle) m Inline
addAttachment (Image attr lab (src,tit))
| not (isURI src) = do
(img, mbmt) <- fetchItem src
let mt = fromMaybe "application/octet-stream" mbmt
modify $ M.insert src
(MimeBundle (M.insert mt (BinaryData img) mempty))
return $ Image attr lab ("attachment:" <> src, tit)
addAttachment x = return x
extractCells :: PandocMonad m => WriterOptions -> [Block] -> m [Ipynb.Cell a]
extractCells _ [] = return []
extractCells opts (Div (_id,classes,kvs) xs : bs)
| "cell" `elem` classes
, "markdown" `elem` classes = do
let meta = pairsToJSONMeta kvs
(newdoc, attachments) <-
runStateT (walkM addAttachment (Pandoc nullMeta xs)) mempty
source <- writeMarkdown opts{ writerTemplate = Nothing } newdoc
(Ipynb.Cell{
cellType = Markdown
, cellSource = Source $ breakLines $ T.stripEnd source
, cellMetadata = meta
, cellAttachments = if M.null attachments
then Nothing
else Just attachments } :)
<$> extractCells opts bs
| "cell" `elem` classes
, "code" `elem` classes = do
let (codeContent, rest) =
case xs of
(CodeBlock _ t : ys) -> (t, ys)
ys -> (mempty, ys)
let meta = pairsToJSONMeta kvs
outputs <- catMaybes <$> mapM blockToOutput rest
let exeCount = lookup "execution_count" kvs >>= safeRead
(Ipynb.Cell{
cellType = Ipynb.Code {
codeExecutionCount = exeCount
, codeOutputs = outputs
}
, cellSource = Source $ breakLines codeContent
, cellMetadata = meta
, cellAttachments = Nothing } :) <$> extractCells opts bs
| "cell" `elem` classes
, "raw" `elem` classes =
case consolidateAdjacentRawBlocks xs of
[RawBlock (Format f) raw] -> do
let format' =
case T.toLower f of
"html" -> "text/html"
"revealjs" -> "text/html"
"latex" -> "text/latex"
"markdown" -> "text/markdown"
"rst" -> "text/x-rst"
_ -> f
(Ipynb.Cell{
cellType = Raw
, cellSource = Source $ breakLines raw
, cellMetadata = if format' == "ipynb" -- means no format given
then mempty
else M.insert "format"
(Aeson.String format') mempty
, cellAttachments = Nothing } :) <$> extractCells opts bs
_ -> extractCells opts bs
extractCells opts (CodeBlock (_id,classes,kvs) raw : bs)
| "code" `elem` classes = do
let meta = pairsToJSONMeta kvs
let exeCount = lookup "execution_count" kvs >>= safeRead
(Ipynb.Cell{
cellType = Ipynb.Code {
codeExecutionCount = exeCount
, codeOutputs = []
}
, cellSource = Source $ breakLines raw
, cellMetadata = meta
, cellAttachments = Nothing } :) <$> extractCells opts bs
extractCells opts (b:bs) = do
let isCodeOrDiv (CodeBlock (_,cl,_) _) = "code" `elem` cl
isCodeOrDiv (Div (_,cl,_) _) = "cell" `elem` cl
isCodeOrDiv _ = False
let (mds, rest) = break isCodeOrDiv bs
extractCells opts (Div ("",["cell","markdown"],[]) (b:mds) : rest)
blockToOutput :: PandocMonad m => Block -> m (Maybe (Output a))
blockToOutput (Div (_,["output","stream",sname],_) (CodeBlock _ t:_)) =
return $ Just
$ Stream{ streamName = sname
, streamText = Source (breakLines t) }
blockToOutput (Div (_,["output","error"],kvs) (CodeBlock _ t:_)) =
return $ Just
$ Err{ errName = fromMaybe mempty (lookup "ename" kvs)
, errValue = fromMaybe mempty (lookup "evalue" kvs)
, errTraceback = breakLines t }
blockToOutput (Div (_,["output","execute_result"],kvs) bs) = do
(data', metadata') <- extractData bs
return $ Just
$ ExecuteResult{ executeCount = fromMaybe 0 $
lookup "execution_count" kvs >>= safeRead
, executeData = data'
, executeMetadata = pairsToJSONMeta kvs <> metadata'}
blockToOutput (Div (_,["output","display_data"],kvs) bs) = do
(data', metadata') <- extractData bs
return $ Just
$ DisplayData { displayData = data'
, displayMetadata = pairsToJSONMeta kvs <> metadata'}
blockToOutput _ = return Nothing
extractData :: PandocMonad m => [Block] -> m (MimeBundle, JSONMeta)
extractData bs = do
(mmap, meta) <- foldM go mempty $ consolidateAdjacentRawBlocks bs
return (MimeBundle mmap, meta)
where
go (mmap, meta) b@(Para [Image (_,_,kvs) _ (src,_)]) = do
(img, mbmt) <- fetchItem src
case mbmt of
Just mt -> return
(M.insert mt (BinaryData img) mmap,
meta <> pairsToJSONMeta kvs)
Nothing -> (mmap, meta) <$ report (BlockNotRendered b)
go (mmap, meta) b@(CodeBlock (_,["json"],_) code) =
case decode (UTF8.fromTextLazy $ TL.fromStrict code) of
Just v -> return
(M.insert "application/json" (JsonData v) mmap, meta)
Nothing -> (mmap, meta) <$ report (BlockNotRendered b)
go (mmap, meta) (CodeBlock ("",[],[]) code) =
return (M.insert "text/plain" (TextualData code) mmap, meta)
go (mmap, meta) (RawBlock (Format "html") raw) =
return (M.insert "text/html" (TextualData raw) mmap, meta)
go (mmap, meta) (RawBlock (Format "latex") raw) =
return (M.insert "text/latex" (TextualData raw) mmap, meta)
go (mmap, meta) (Div _ bs') = foldM go (mmap, meta) bs'
go (mmap, meta) b = (mmap, meta) <$ report (BlockNotRendered b)
pairsToJSONMeta :: [(Text, Text)] -> JSONMeta
pairsToJSONMeta kvs =
M.fromList [(k, case Aeson.decode (UTF8.fromTextLazy $ TL.fromStrict v) of
Just val -> val
Nothing -> String v)
| (k,v) <- kvs
, k /= "execution_count"
]
consolidateAdjacentRawBlocks :: [Block] -> [Block]
consolidateAdjacentRawBlocks [] = []
consolidateAdjacentRawBlocks (RawBlock f1 x : RawBlock f2 y : xs)
| f1 == f2
= consolidateAdjacentRawBlocks (RawBlock f1 (x <> "\n" <> y) : xs)
consolidateAdjacentRawBlocks (x : xs) =
x : consolidateAdjacentRawBlocks xs
|
