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|
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE TypeSynonymInstances #-}
{- |
Module : Text.Pandoc.Shared
Copyright : Copyright (C) 2006-2019 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Utility functions and definitions used by the various Pandoc modules.
-}
module Text.Pandoc.Shared (
-- * List processing
splitBy,
splitByIndices,
splitStringByIndices,
substitute,
ordNub,
-- * Text processing
ToString (..),
backslashEscapes,
escapeStringUsing,
stripTrailingNewlines,
trim,
triml,
trimr,
trimMath,
stripFirstAndLast,
camelCaseToHyphenated,
toRomanNumeral,
escapeURI,
tabFilter,
crFilter,
-- * Date/time
normalizeDate,
-- * Pandoc block and inline list processing
orderedListMarkers,
extractSpaces,
removeFormatting,
deNote,
stringify,
capitalize,
compactify,
compactifyDL,
linesToPara,
Element (..),
hierarchicalize,
uniqueIdent,
inlineListToIdentifier,
isHeaderBlock,
headerShift,
stripEmptyParagraphs,
isTightList,
taskListItemFromAscii,
taskListItemToAscii,
addMetaField,
makeMeta,
eastAsianLineBreakFilter,
underlineSpan,
splitSentences,
filterIpynbOutput,
-- * TagSoup HTML handling
renderTags',
-- * File handling
inDirectory,
collapseFilePath,
uriPathToPath,
filteredFilesFromArchive,
-- * URI handling
schemes,
isURI,
-- * Error handling
mapLeft,
-- * for squashing blocks
blocksToInlines,
blocksToInlines',
blocksToInlinesWithSep,
defaultBlocksSeparator,
-- * Safe read
safeRead,
-- * Temp directory
withTempDir,
-- * Version
pandocVersion
) where
import Prelude
import Codec.Archive.Zip
import qualified Control.Exception as E
import Control.Monad (MonadPlus (..), msum, unless)
import qualified Control.Monad.State.Strict as S
import qualified Data.ByteString.Lazy as BL
import qualified Data.Bifunctor as Bifunctor
import Data.Char (isAlpha, isLower, isSpace, isUpper, toLower, isAlphaNum,
generalCategory, GeneralCategory(NonSpacingMark,
SpacingCombiningMark, EnclosingMark, ConnectorPunctuation))
import Data.Data (Data, Typeable)
import Data.List (find, intercalate, intersperse, stripPrefix, sortBy)
import qualified Data.Map as M
import Data.Maybe (mapMaybe)
import Data.Sequence (ViewL (..), ViewR (..), viewl, viewr)
import qualified Data.Set as Set
import qualified Data.Text as T
import Data.Ord (comparing)
import Data.Version (showVersion)
import Network.URI (URI (uriScheme), escapeURIString, parseURI)
import Paths_pandoc (version)
import System.Directory
import System.FilePath (isPathSeparator, splitDirectories)
import qualified System.FilePath.Posix as Posix
import System.IO.Temp
import Text.HTML.TagSoup (RenderOptions (..), Tag (..), renderOptions,
renderTagsOptions)
import Text.Pandoc.Builder (Blocks, Inlines, ToMetaValue (..))
import qualified Text.Pandoc.Builder as B
import Data.Time
import Text.Pandoc.Asciify (toAsciiChar)
import Text.Pandoc.Definition
import Text.Pandoc.Extensions (Extensions, Extension(..), extensionEnabled)
import Text.Pandoc.Generic (bottomUp)
import Text.Pandoc.Pretty (charWidth)
import Text.Pandoc.Walk
-- | Version number of pandoc library.
pandocVersion :: String
pandocVersion = showVersion version
--
-- List processing
--
-- | Split list by groups of one or more sep.
splitBy :: (a -> Bool) -> [a] -> [[a]]
splitBy _ [] = []
splitBy isSep lst =
let (first, rest) = break isSep lst
rest' = dropWhile isSep rest
in first:splitBy isSep rest'
splitByIndices :: [Int] -> [a] -> [[a]]
splitByIndices [] lst = [lst]
splitByIndices (x:xs) lst = first:splitByIndices (map (\y -> y - x) xs) rest
where (first, rest) = splitAt x lst
-- | Split string into chunks divided at specified indices.
splitStringByIndices :: [Int] -> [Char] -> [[Char]]
splitStringByIndices [] lst = [lst]
splitStringByIndices (x:xs) lst =
let (first, rest) = splitAt' x lst in
first : splitStringByIndices (map (\y -> y - x) xs) rest
splitAt' :: Int -> [Char] -> ([Char],[Char])
splitAt' _ [] = ([],[])
splitAt' n xs | n <= 0 = ([],xs)
splitAt' n (x:xs) = (x:ys,zs)
where (ys,zs) = splitAt' (n - charWidth x) xs
-- | Replace each occurrence of one sublist in a list with another.
substitute :: (Eq a) => [a] -> [a] -> [a] -> [a]
substitute _ _ [] = []
substitute [] _ xs = xs
substitute target replacement lst@(x:xs) =
case stripPrefix target lst of
Just lst' -> replacement ++ substitute target replacement lst'
Nothing -> x : substitute target replacement xs
ordNub :: (Ord a) => [a] -> [a]
ordNub l = go Set.empty l
where
go _ [] = []
go s (x:xs) = if x `Set.member` s then go s xs
else x : go (Set.insert x s) xs
--
-- Text processing
--
class ToString a where
toString :: a -> String
instance ToString String where
toString = id
instance ToString T.Text where
toString = T.unpack
-- | Returns an association list of backslash escapes for the
-- designated characters.
backslashEscapes :: [Char] -- ^ list of special characters to escape
-> [(Char, String)]
backslashEscapes = map (\ch -> (ch, ['\\',ch]))
-- | Escape a string of characters, using an association list of
-- characters and strings.
escapeStringUsing :: [(Char, String)] -> String -> String
escapeStringUsing _ [] = ""
escapeStringUsing escapeTable (x:xs) =
case lookup x escapeTable of
Just str -> str ++ rest
Nothing -> x:rest
where rest = escapeStringUsing escapeTable xs
-- | Strip trailing newlines from string.
stripTrailingNewlines :: String -> String
stripTrailingNewlines = reverse . dropWhile (== '\n') . reverse
-- | Remove leading and trailing space (including newlines) from string.
trim :: String -> String
trim = triml . trimr
-- | Remove leading space (including newlines) from string.
triml :: String -> String
triml = dropWhile (`elem` " \r\n\t")
-- | Remove trailing space (including newlines) from string.
trimr :: String -> String
trimr = reverse . triml . reverse
-- | Trim leading space and trailing space unless after \.
trimMath :: String -> String
trimMath = triml . reverse . stripspace . reverse
where
stripspace (c1:c2:cs)
| c1 `elem` [' ','\t','\n','\r']
, c2 /= '\\' = stripspace (c2:cs)
stripspace cs = cs
-- | Strip leading and trailing characters from string
stripFirstAndLast :: String -> String
stripFirstAndLast str =
drop 1 $ take (length str - 1) str
-- | Change CamelCase word to hyphenated lowercase (e.g., camel-case).
camelCaseToHyphenated :: String -> String
camelCaseToHyphenated [] = ""
camelCaseToHyphenated (a:b:rest) | isLower a && isUpper b =
a:'-':toLower b:camelCaseToHyphenated rest
camelCaseToHyphenated (a:rest) = toLower a:camelCaseToHyphenated rest
-- | Convert number < 4000 to uppercase roman numeral.
toRomanNumeral :: Int -> String
toRomanNumeral x
| x >= 4000 || x < 0 = "?"
| x >= 1000 = "M" ++ toRomanNumeral (x - 1000)
| x >= 900 = "CM" ++ toRomanNumeral (x - 900)
| x >= 500 = "D" ++ toRomanNumeral (x - 500)
| x >= 400 = "CD" ++ toRomanNumeral (x - 400)
| x >= 100 = "C" ++ toRomanNumeral (x - 100)
| x >= 90 = "XC" ++ toRomanNumeral (x - 90)
| x >= 50 = "L" ++ toRomanNumeral (x - 50)
| x >= 40 = "XL" ++ toRomanNumeral (x - 40)
| x >= 10 = "X" ++ toRomanNumeral (x - 10)
| x == 9 = "IX"
| x >= 5 = "V" ++ toRomanNumeral (x - 5)
| x == 4 = "IV"
| x >= 1 = "I" ++ toRomanNumeral (x - 1)
| otherwise = ""
-- | Escape whitespace and some punctuation characters in URI.
escapeURI :: String -> String
escapeURI = escapeURIString (not . needsEscaping)
where needsEscaping c = isSpace c || c `elem`
['<','>','|','"','{','}','[',']','^', '`']
-- | Convert tabs to spaces. Tabs will be preserved if tab stop is set to 0.
tabFilter :: Int -- ^ Tab stop
-> T.Text -- ^ Input
-> T.Text
tabFilter 0 = id
tabFilter tabStop = T.unlines . map go . T.lines
where go s =
let (s1, s2) = T.break (== '\t') s
in if T.null s2
then s1
else s1 <> T.replicate
(tabStop - (T.length s1 `mod` tabStop)) (T.pack " ")
<> go (T.drop 1 s2)
-- | Strip out DOS line endings.
crFilter :: T.Text -> T.Text
crFilter = T.filter (/= '\r')
--
-- Date/time
--
-- | Parse a date and convert (if possible) to "YYYY-MM-DD" format. We
-- limit years to the range 1601-9999 (ISO 8601 accepts greater than
-- or equal to 1583, but MS Word only accepts dates starting 1601).
normalizeDate :: String -> Maybe String
normalizeDate s = fmap (formatTime defaultTimeLocale "%F")
(msum $ map (\fs -> parsetimeWith fs s >>= rejectBadYear) formats :: Maybe Day)
where rejectBadYear day = case toGregorian day of
(y, _, _) | y >= 1601 && y <= 9999 -> Just day
_ -> Nothing
parsetimeWith = parseTimeM True defaultTimeLocale
formats = ["%x","%m/%d/%Y", "%D","%F", "%d %b %Y",
"%e %B %Y", "%b. %e, %Y", "%B %e, %Y",
"%Y%m%d", "%Y%m", "%Y"]
--
-- Pandoc block and inline list processing
--
-- | Generate infinite lazy list of markers for an ordered list,
-- depending on list attributes.
orderedListMarkers :: (Int, ListNumberStyle, ListNumberDelim) -> [String]
orderedListMarkers (start, numstyle, numdelim) =
let singleton c = [c]
nums = case numstyle of
DefaultStyle -> map show [start..]
Example -> map show [start..]
Decimal -> map show [start..]
UpperAlpha -> drop (start - 1) $ cycle $
map singleton ['A'..'Z']
LowerAlpha -> drop (start - 1) $ cycle $
map singleton ['a'..'z']
UpperRoman -> map toRomanNumeral [start..]
LowerRoman -> map (map toLower . toRomanNumeral) [start..]
inDelim str = case numdelim of
DefaultDelim -> str ++ "."
Period -> str ++ "."
OneParen -> str ++ ")"
TwoParens -> "(" ++ str ++ ")"
in map inDelim nums
-- | Extract the leading and trailing spaces from inside an inline element
-- and place them outside the element. SoftBreaks count as Spaces for
-- these purposes.
extractSpaces :: (Inlines -> Inlines) -> Inlines -> Inlines
extractSpaces f is =
let contents = B.unMany is
left = case viewl contents of
(Space :< _) -> B.space
(SoftBreak :< _) -> B.softbreak
_ -> mempty
right = case viewr contents of
(_ :> Space) -> B.space
(_ :> SoftBreak) -> B.softbreak
_ -> mempty in
(left <> f (B.trimInlines . B.Many $ contents) <> right)
-- | Extract inlines, removing formatting.
removeFormatting :: Walkable Inline a => a -> [Inline]
removeFormatting = query go . walk (deNote . deQuote)
where go :: Inline -> [Inline]
go (Str xs) = [Str xs]
go Space = [Space]
go SoftBreak = [SoftBreak]
go (Code _ x) = [Str x]
go (Math _ x) = [Str x]
go LineBreak = [Space]
go _ = []
deNote :: Inline -> Inline
deNote (Note _) = Str ""
deNote x = x
deQuote :: Inline -> Inline
deQuote (Quoted SingleQuote xs) =
Span ("",[],[]) (Str "\8216" : xs ++ [Str "\8217"])
deQuote (Quoted DoubleQuote xs) =
Span ("",[],[]) (Str "\8220" : xs ++ [Str "\8221"])
deQuote x = x
-- | Convert pandoc structure to a string with formatting removed.
-- Footnotes are skipped (since we don't want their contents in link
-- labels).
stringify :: Walkable Inline a => a -> String
stringify = query go . walk (deNote . deQuote)
where go :: Inline -> [Char]
go Space = " "
go SoftBreak = " "
go (Str x) = x
go (Code _ x) = x
go (Math _ x) = x
go (RawInline (Format "html") ('<':'b':'r':_)) = " " -- see #2105
go LineBreak = " "
go _ = ""
-- | Bring all regular text in a pandoc structure to uppercase.
--
-- This function correctly handles cases where a lowercase character doesn't
-- match to a single uppercase character – e.g. “Straße” would be converted
-- to “STRASSE”, not “STRAßE”.
capitalize :: Walkable Inline a => a -> a
capitalize = walk go
where go :: Inline -> Inline
go (Str s) = Str (T.unpack $ T.toUpper $ T.pack s)
go x = x
-- | Change final list item from @Para@ to @Plain@ if the list contains
-- no other @Para@ blocks. Otherwise (if the list items contain @Para@
-- blocks besides possibly at the end), turn any @Plain@s into @Para@s (#5285).
compactify :: [Blocks] -- ^ List of list items (each a list of blocks)
-> [Blocks]
compactify [] = []
compactify items =
let (others, final) = (init items, last items)
in case reverse (B.toList final) of
(Para a:xs)
| null [Para x | Para x <- (xs ++ concatMap B.toList others)]
-> others ++ [B.fromList (reverse (Plain a : xs))]
_ | null [Para x | Para x <- concatMap B.toList items]
-> items
_ -> map (fmap plainToPara) items
plainToPara :: Block -> Block
plainToPara (Plain ils) = Para ils
plainToPara x = x
-- | Like @compactify@, but acts on items of definition lists.
compactifyDL :: [(Inlines, [Blocks])] -> [(Inlines, [Blocks])]
compactifyDL items =
let defs = concatMap snd items
in case reverse (concatMap B.toList defs) of
(Para x:xs)
| not (any isPara xs) ->
let (t,ds) = last items
lastDef = B.toList $ last ds
ds' = init ds ++
if null lastDef
then [B.fromList lastDef]
else [B.fromList $ init lastDef ++ [Plain x]]
in init items ++ [(t, ds')]
| otherwise -> items
_ -> items
-- | Combine a list of lines by adding hard linebreaks.
combineLines :: [[Inline]] -> [Inline]
combineLines = intercalate [LineBreak]
-- | Convert a list of lines into a paragraph with hard line breaks. This is
-- useful e.g. for rudimentary support of LineBlock elements in writers.
linesToPara :: [[Inline]] -> Block
linesToPara = Para . combineLines
isPara :: Block -> Bool
isPara (Para _) = True
isPara _ = False
-- | Data structure for defining hierarchical Pandoc documents
data Element = Blk Block
| Sec Int [Int] Attr [Inline] [Element]
-- lvl num attributes label contents
deriving (Eq, Read, Show, Typeable, Data)
instance Walkable Inline Element where
walk f (Blk x) = Blk (walk f x)
walk f (Sec lev nums attr ils elts) = Sec lev nums attr (walk f ils) (walk f elts)
walkM f (Blk x) = Blk `fmap` walkM f x
walkM f (Sec lev nums attr ils elts) = do
ils' <- walkM f ils
elts' <- walkM f elts
return $ Sec lev nums attr ils' elts'
query f (Blk x) = query f x
query f (Sec _ _ _ ils elts) = query f ils `mappend` query f elts
instance Walkable Block Element where
walk f (Blk x) = Blk (walk f x)
walk f (Sec lev nums attr ils elts) = Sec lev nums attr (walk f ils) (walk f elts)
walkM f (Blk x) = Blk `fmap` walkM f x
walkM f (Sec lev nums attr ils elts) = do
ils' <- walkM f ils
elts' <- walkM f elts
return $ Sec lev nums attr ils' elts'
query f (Blk x) = query f x
query f (Sec _ _ _ ils elts) = query f ils `mappend` query f elts
-- | Convert Pandoc inline list to plain text identifier. HTML
-- identifiers must start with a letter, and may contain only
-- letters, digits, and the characters _-.
inlineListToIdentifier :: Extensions -> [Inline] -> String
inlineListToIdentifier exts =
dropNonLetter . filterAscii . toIdent . stringify
where
dropNonLetter
| extensionEnabled Ext_gfm_auto_identifiers exts = id
| otherwise = dropWhile (not . isAlpha)
filterAscii
| extensionEnabled Ext_ascii_identifiers exts
= mapMaybe toAsciiChar
| otherwise = id
toIdent
| extensionEnabled Ext_gfm_auto_identifiers exts =
filterPunct . spaceToDash . map toLower
| otherwise = intercalate "-" . words . filterPunct . map toLower
filterPunct = filter (\c -> isSpace c || isAlphaNum c || isAllowedPunct c)
isAllowedPunct c
| extensionEnabled Ext_gfm_auto_identifiers exts
= c == '-' || c == '_' ||
generalCategory c `elem` [NonSpacingMark, SpacingCombiningMark,
EnclosingMark, ConnectorPunctuation]
| otherwise = c == '_' || c == '-' || c == '.'
spaceToDash = map (\c -> if isSpace c then '-' else c)
-- | Convert list of Pandoc blocks into (hierarchical) list of Elements
hierarchicalize :: [Block] -> [Element]
hierarchicalize blocks = S.evalState (hierarchicalizeWithIds blocks) []
hierarchicalizeWithIds :: [Block] -> S.State [Int] [Element]
hierarchicalizeWithIds [] = return []
hierarchicalizeWithIds (Header level attr@(_,classes,_) title':xs) = do
lastnum <- S.get
let lastnum' = take level lastnum
let newnum = case length lastnum' of
x | "unnumbered" `elem` classes -> []
| x >= level -> init lastnum' ++ [last lastnum' + 1]
| otherwise -> lastnum ++
replicate (level - length lastnum - 1) 0 ++ [1]
unless (null newnum) $ S.put newnum
let (sectionContents, rest) = break (headerLtEq level) xs
sectionContents' <- hierarchicalizeWithIds sectionContents
rest' <- hierarchicalizeWithIds rest
return $ Sec level newnum attr title' sectionContents' : rest'
hierarchicalizeWithIds (Div ("refs",classes',kvs')
(Header level (ident,classes,kvs) title' : xs):ys) =
hierarchicalizeWithIds (Header level (ident,"references":classes,kvs)
title' : Div ("refs",classes',kvs') xs : ys)
hierarchicalizeWithIds (x:rest) = do
rest' <- hierarchicalizeWithIds rest
return $ Blk x : rest'
headerLtEq :: Int -> Block -> Bool
headerLtEq level (Header l _ _) = l <= level
headerLtEq level (Div ("",["references"],[]) (Header l _ _ : _)) = l <= level
headerLtEq _ _ = False
-- | Generate a unique identifier from a list of inlines.
-- Second argument is a list of already used identifiers.
uniqueIdent :: Extensions -> [Inline] -> Set.Set String -> String
uniqueIdent exts title' usedIdents =
if baseIdent `Set.member` usedIdents
then case find (\x -> not $ numIdent x `Set.member` usedIdents)
([1..60000] :: [Int]) of
Just x -> numIdent x
Nothing -> baseIdent
-- if we have more than 60,000, allow repeats
else baseIdent
where
baseIdent = case inlineListToIdentifier exts title' of
"" -> "section"
x -> x
numIdent n = baseIdent ++ "-" ++ show n
-- | True if block is a Header block.
isHeaderBlock :: Block -> Bool
isHeaderBlock Header{} = True
isHeaderBlock _ = False
-- | Shift header levels up or down.
headerShift :: Int -> Pandoc -> Pandoc
headerShift n = walk shift
where shift :: Block -> Block
shift (Header level attr inner) = Header (level + n) attr inner
shift x = x
-- | Remove empty paragraphs.
stripEmptyParagraphs :: Pandoc -> Pandoc
stripEmptyParagraphs = walk go
where go :: [Block] -> [Block]
go = filter (not . isEmptyParagraph)
isEmptyParagraph (Para []) = True
isEmptyParagraph _ = False
-- | Detect if a list is tight.
isTightList :: [[Block]] -> Bool
isTightList = all firstIsPlain
where firstIsPlain (Plain _ : _) = True
firstIsPlain _ = False
-- | Convert a list item containing tasklist syntax (e.g. @[x]@)
-- to using @U+2610 BALLOT BOX@ or @U+2612 BALLOT BOX WITH X@.
taskListItemFromAscii :: Extensions -> [Block] -> [Block]
taskListItemFromAscii = handleTaskListItem fromMd
where
fromMd (Str "[" : Space : Str "]" : Space : is) = (Str "☐") : Space : is
fromMd (Str "[x]" : Space : is) = (Str "☒") : Space : is
fromMd (Str "[X]" : Space : is) = (Str "☒") : Space : is
fromMd is = is
-- | Convert a list item containing text starting with @U+2610 BALLOT BOX@
-- or @U+2612 BALLOT BOX WITH X@ to tasklist syntax (e.g. @[x]@).
taskListItemToAscii :: Extensions -> [Block] -> [Block]
taskListItemToAscii = handleTaskListItem toMd
where
toMd (Str "☐" : Space : is) = rawMd "[ ]" : Space : is
toMd (Str "☒" : Space : is) = rawMd "[x]" : Space : is
toMd is = is
rawMd = RawInline (Format "markdown")
handleTaskListItem :: ([Inline] -> [Inline]) -> Extensions -> [Block] -> [Block]
handleTaskListItem handleInlines exts bls =
if Ext_task_lists `extensionEnabled` exts
then handleItem bls
else bls
where
handleItem (Plain is : bs) = Plain (handleInlines is) : bs
handleItem (Para is : bs) = Para (handleInlines is) : bs
handleItem bs = bs
-- | Set a field of a 'Meta' object. If the field already has a value,
-- convert it into a list with the new value appended to the old value(s).
addMetaField :: ToMetaValue a
=> String
-> a
-> Meta
-> Meta
addMetaField key val (Meta meta) =
Meta $ M.insertWith combine key (toMetaValue val) meta
where combine newval (MetaList xs) = MetaList (xs ++ tolist newval)
combine newval x = MetaList [x, newval]
tolist (MetaList ys) = ys
tolist y = [y]
-- | Create 'Meta' from old-style title, authors, date. This is
-- provided to ease the transition from the old API.
makeMeta :: [Inline] -> [[Inline]] -> [Inline] -> Meta
makeMeta title authors date =
addMetaField "title" (B.fromList title)
$ addMetaField "author" (map B.fromList authors)
$ addMetaField "date" (B.fromList date) nullMeta
-- | Remove soft breaks between East Asian characters.
eastAsianLineBreakFilter :: Pandoc -> Pandoc
eastAsianLineBreakFilter = bottomUp go
where go (x:SoftBreak:y:zs) =
case (stringify x, stringify y) of
(xs@(_:_), c:_)
| charWidth (last xs) == 2 && charWidth c == 2 -> x:y:zs
_ -> x:SoftBreak:y:zs
go xs = xs
-- | Builder for underline.
-- This probably belongs in Builder.hs in pandoc-types.
-- Will be replaced once Underline is an element.
underlineSpan :: Inlines -> Inlines
underlineSpan = B.spanWith ("", ["underline"], [])
-- | Returns the first sentence in a list of inlines, and the rest.
breakSentence :: [Inline] -> ([Inline], [Inline])
breakSentence [] = ([],[])
breakSentence xs =
let isSentenceEndInline (Str ys@(_:_)) | last ys == '.' = True
isSentenceEndInline (Str ys@(_:_)) | last ys == '?' = True
isSentenceEndInline LineBreak = True
isSentenceEndInline _ = False
(as, bs) = break isSentenceEndInline xs
in case bs of
[] -> (as, [])
[c] -> (as ++ [c], [])
(c:Space:cs) -> (as ++ [c], cs)
(c:SoftBreak:cs) -> (as ++ [c], cs)
(Str ".":Str (')':ys):cs) -> (as ++ [Str ".", Str (')':ys)], cs)
(x@(Str ('.':')':_)):cs) -> (as ++ [x], cs)
(LineBreak:x@(Str ('.':_)):cs) -> (as ++[LineBreak], x:cs)
(c:cs) -> (as ++ [c] ++ ds, es)
where (ds, es) = breakSentence cs
-- | Split a list of inlines into sentences.
splitSentences :: [Inline] -> [[Inline]]
splitSentences xs =
let (sent, rest) = breakSentence xs
in if null rest then [sent] else sent : splitSentences rest
-- | Process ipynb output cells. If mode is Nothing,
-- remove all output. If mode is Just format, select
-- best output for the format.
filterIpynbOutput :: Maybe Format -> Pandoc -> Pandoc
filterIpynbOutput mode = walk go
where go (Div (ident, ("output":os), kvs) bs) =
case mode of
Nothing -> Div (ident, ("output":os), kvs) []
Just fmt -> Div (ident, ("output":os), kvs) $
take 1 $ sortBy (comparing rank) bs
where
rank (RawBlock (Format "html") _)
| fmt == Format "html" = (1 :: Int)
| fmt == Format "markdown" = 2
| otherwise = 3
rank (RawBlock (Format "latex") _)
| fmt == Format "latex" = 1
| fmt == Format "markdown" = 2
| otherwise = 3
rank (RawBlock f _)
| fmt == f = 1
| otherwise = 3
rank _ = 2
go x = x
--
-- TagSoup HTML handling
--
-- | Render HTML tags.
renderTags' :: [Tag String] -> String
renderTags' = renderTagsOptions
renderOptions{ optMinimize = matchTags ["hr", "br", "img",
"meta", "link"]
, optRawTag = matchTags ["script", "style"] }
where matchTags tags = flip elem tags . map toLower
--
-- File handling
--
-- | Perform an IO action in a directory, returning to starting directory.
inDirectory :: FilePath -> IO a -> IO a
inDirectory path action = E.bracket
getCurrentDirectory
setCurrentDirectory
(const $ setCurrentDirectory path >> action)
--
-- Error reporting
--
mapLeft :: (a -> b) -> Either a c -> Either b c
mapLeft = Bifunctor.first
-- | Remove intermediate "." and ".." directories from a path.
--
-- > collapseFilePath "./foo" == "foo"
-- > collapseFilePath "/bar/../baz" == "/baz"
-- > collapseFilePath "/../baz" == "/../baz"
-- > collapseFilePath "parent/foo/baz/../bar" == "parent/foo/bar"
-- > collapseFilePath "parent/foo/baz/../../bar" == "parent/bar"
-- > collapseFilePath "parent/foo/.." == "parent"
-- > collapseFilePath "/parent/foo/../../bar" == "/bar"
collapseFilePath :: FilePath -> FilePath
collapseFilePath = Posix.joinPath . reverse . foldl go [] . splitDirectories
where
go rs "." = rs
go r@(p:rs) ".." = case p of
".." -> "..":r
(checkPathSeperator -> Just True) -> "..":r
_ -> rs
go _ (checkPathSeperator -> Just True) = [[Posix.pathSeparator]]
go rs x = x:rs
isSingleton [] = Nothing
isSingleton [x] = Just x
isSingleton _ = Nothing
checkPathSeperator = fmap isPathSeparator . isSingleton
-- Convert the path part of a file: URI to a regular path.
-- On windows, @/c:/foo@ should be @c:/foo@.
-- On linux, @/foo@ should be @/foo@.
uriPathToPath :: String -> FilePath
uriPathToPath path =
#ifdef _WINDOWS
case path of
'/':ps -> ps
ps -> ps
#else
path
#endif
--
-- File selection from the archive
--
filteredFilesFromArchive :: Archive -> (FilePath -> Bool) -> [(FilePath, BL.ByteString)]
filteredFilesFromArchive zf f =
mapMaybe (fileAndBinary zf) (filter f (filesInArchive zf))
where
fileAndBinary :: Archive -> FilePath -> Maybe (FilePath, BL.ByteString)
fileAndBinary a fp = findEntryByPath fp a >>= \e -> Just (fp, fromEntry e)
--
-- IANA URIs
--
-- | Schemes from http://www.iana.org/assignments/uri-schemes.html plus
-- the unofficial schemes doi, javascript, isbn, pmid.
schemes :: Set.Set String
schemes = Set.fromList
-- Official IANA schemes
[ "aaa", "aaas", "about", "acap", "acct", "acr", "adiumxtra", "afp", "afs"
, "aim", "appdata", "apt", "attachment", "aw", "barion", "beshare", "bitcoin"
, "blob", "bolo", "browserext", "callto", "cap", "chrome", "chrome-extension"
, "cid", "coap", "coaps", "com-eventbrite-attendee", "content", "crid", "cvs"
, "data", "dav", "dict", "dis", "dlna-playcontainer", "dlna-playsingle"
, "dns", "dntp", "dtn", "dvb", "ed2k", "example", "facetime", "fax", "feed"
, "feedready", "file", "filesystem", "finger", "fish", "ftp", "geo", "gg"
, "git", "gizmoproject", "go", "gopher", "graph", "gtalk", "h323", "ham"
, "hcp", "http", "https", "hxxp", "hxxps", "hydrazone", "iax", "icap", "icon"
, "im", "imap", "info", "iotdisco", "ipn", "ipp", "ipps", "irc", "irc6"
, "ircs", "iris", "iris.beep", "iris.lwz", "iris.xpc", "iris.xpcs"
, "isostore", "itms", "jabber", "jar", "jms", "keyparc", "lastfm", "ldap"
, "ldaps", "lvlt", "magnet", "mailserver", "mailto", "maps", "market"
, "message", "mid", "mms", "modem", "mongodb", "moz", "ms-access"
, "ms-browser-extension", "ms-drive-to", "ms-enrollment", "ms-excel"
, "ms-gamebarservices", "ms-getoffice", "ms-help", "ms-infopath"
, "ms-media-stream-id", "ms-officeapp", "ms-project", "ms-powerpoint"
, "ms-publisher", "ms-search-repair", "ms-secondary-screen-controller"
, "ms-secondary-screen-setup", "ms-settings", "ms-settings-airplanemode"
, "ms-settings-bluetooth", "ms-settings-camera", "ms-settings-cellular"
, "ms-settings-cloudstorage", "ms-settings-connectabledevices"
, "ms-settings-displays-topology", "ms-settings-emailandaccounts"
, "ms-settings-language", "ms-settings-location", "ms-settings-lock"
, "ms-settings-nfctransactions", "ms-settings-notifications"
, "ms-settings-power", "ms-settings-privacy", "ms-settings-proximity"
, "ms-settings-screenrotation", "ms-settings-wifi", "ms-settings-workplace"
, "ms-spd", "ms-sttoverlay", "ms-transit-to", "ms-virtualtouchpad"
, "ms-visio", "ms-walk-to", "ms-whiteboard", "ms-whiteboard-cmd", "ms-word"
, "msnim", "msrp", "msrps", "mtqp", "mumble", "mupdate", "mvn", "news", "nfs"
, "ni", "nih", "nntp", "notes", "ocf", "oid", "onenote", "onenote-cmd"
, "opaquelocktoken", "pack", "palm", "paparazzi", "pkcs11", "platform", "pop"
, "pres", "prospero", "proxy", "pwid", "psyc", "qb", "query", "redis"
, "rediss", "reload", "res", "resource", "rmi", "rsync", "rtmfp", "rtmp"
, "rtsp", "rtsps", "rtspu", "secondlife", "service", "session", "sftp", "sgn"
, "shttp", "sieve", "sip", "sips", "skype", "smb", "sms", "smtp", "snews"
, "snmp", "soap.beep", "soap.beeps", "soldat", "spotify", "ssh", "steam"
, "stun", "stuns", "submit", "svn", "tag", "teamspeak", "tel", "teliaeid"
, "telnet", "tftp", "things", "thismessage", "tip", "tn3270", "tool", "turn"
, "turns", "tv", "udp", "unreal", "urn", "ut2004", "v-event", "vemmi"
, "ventrilo", "videotex", "vnc", "view-source", "wais", "webcal", "wpid"
, "ws", "wss", "wtai", "wyciwyg", "xcon", "xcon-userid", "xfire"
, "xmlrpc.beep", "xmlrpc.beeps", "xmpp", "xri", "ymsgr", "z39.50", "z39.50r"
, "z39.50s"
-- Unofficial schemes
, "doi", "isbn", "javascript", "pmid"
]
-- | Check if the string is a valid URL with a IANA or frequently used but
-- unofficial scheme (see @schemes@).
isURI :: String -> Bool
isURI = maybe False hasKnownScheme . parseURI
where
hasKnownScheme = (`Set.member` schemes) . map toLower .
filter (/= ':') . uriScheme
---
--- Squash blocks into inlines
---
blockToInlines :: Block -> Inlines
blockToInlines (Plain ils) = B.fromList ils
blockToInlines (Para ils) = B.fromList ils
blockToInlines (LineBlock lns) = B.fromList $ combineLines lns
blockToInlines (CodeBlock attr str) = B.codeWith attr str
blockToInlines (RawBlock (Format fmt) str) = B.rawInline fmt str
blockToInlines (BlockQuote blks) = blocksToInlines' blks
blockToInlines (OrderedList _ blkslst) =
mconcat $ map blocksToInlines' blkslst
blockToInlines (BulletList blkslst) =
mconcat $ map blocksToInlines' blkslst
blockToInlines (DefinitionList pairslst) =
mconcat $ map f pairslst
where
f (ils, blkslst) = B.fromList ils <> B.str ":" <> B.space <>
mconcat (map blocksToInlines' blkslst)
blockToInlines (Header _ _ ils) = B.fromList ils
blockToInlines HorizontalRule = mempty
blockToInlines (Table _ _ _ headers rows) =
mconcat $ intersperse B.linebreak $
map (mconcat . map blocksToInlines') (headers:rows)
blockToInlines (Div _ blks) = blocksToInlines' blks
blockToInlines Null = mempty
blocksToInlinesWithSep :: Inlines -> [Block] -> Inlines
blocksToInlinesWithSep sep =
mconcat . intersperse sep . map blockToInlines
blocksToInlines' :: [Block] -> Inlines
blocksToInlines' = blocksToInlinesWithSep defaultBlocksSeparator
blocksToInlines :: [Block] -> [Inline]
blocksToInlines = B.toList . blocksToInlines'
-- | Inline elements used to separate blocks when squashing blocks into
-- inlines.
defaultBlocksSeparator :: Inlines
defaultBlocksSeparator =
-- This is used in the pandoc.utils.blocks_to_inlines function. Docs
-- there should be updated if this is changed.
B.space <> B.str "¶" <> B.space
--
-- Safe read
--
safeRead :: (MonadPlus m, Read a) => String -> m a
safeRead s = case reads s of
(d,x):_
| all isSpace x -> return d
_ -> mzero
--
-- Temp directory
--
-- TODO remove in next major release; this is no longer
-- used in the code base.
withTempDir :: String -> (FilePath -> IO a) -> IO a
withTempDir =
#ifdef _WINDOWS
withTempDirectory "."
#else
withSystemTempDirectory
#endif
|