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|
{-# LANGUAGE DeriveDataTypeable, CPP, MultiParamTypeClasses,
FlexibleContexts, ScopedTypeVariables, PatternGuards,
ViewPatterns #-}
{-
Copyright (C) 2006-2015 John MacFarlane <jgm@berkeley.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.Shared
Copyright : Copyright (C) 2006-2015 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
backslashEscapes,
escapeStringUsing,
stripTrailingNewlines,
trim,
triml,
trimr,
stripFirstAndLast,
camelCaseToHyphenated,
toRomanNumeral,
escapeURI,
tabFilter,
-- * Date/time
normalizeDate,
-- * Pandoc block and inline list processing
orderedListMarkers,
normalizeSpaces,
extractSpaces,
normalize,
normalizeInlines,
normalizeBlocks,
removeFormatting,
stringify,
capitalize,
compactify,
compactify',
compactify'DL,
Element (..),
hierarchicalize,
uniqueIdent,
isHeaderBlock,
headerShift,
isTightList,
addMetaField,
makeMeta,
-- * TagSoup HTML handling
renderTags',
-- * File handling
inDirectory,
getDefaultReferenceDocx,
getDefaultReferenceODT,
readDataFile,
readDataFileUTF8,
fetchItem,
fetchItem',
openURL,
collapseFilePath,
-- * Error handling
err,
warn,
mapLeft,
hush,
-- * Safe read
safeRead,
-- * Temp directory
withTempDir
) where
import Text.Pandoc.Definition
import Text.Pandoc.Walk
import Text.Pandoc.MediaBag (MediaBag, lookupMedia)
import Text.Pandoc.Builder (Inlines, Blocks, ToMetaValue(..))
import qualified Text.Pandoc.Builder as B
import qualified Text.Pandoc.UTF8 as UTF8
import System.Environment (getProgName)
import System.Exit (exitWith, ExitCode(..))
import Data.Char ( toLower, isLower, isUpper, isAlpha,
isLetter, isDigit, isSpace )
import Data.List ( find, stripPrefix, intercalate )
import qualified Data.Map as M
import Network.URI ( escapeURIString, isURI, nonStrictRelativeTo,
unEscapeString, parseURIReference, isAllowedInURI )
import qualified Data.Set as Set
import System.Directory
import System.FilePath (joinPath, splitDirectories, pathSeparator, isPathSeparator)
import Text.Pandoc.MIME (MimeType, getMimeType)
import System.FilePath ( (</>), takeExtension, dropExtension)
import Data.Generics (Typeable, Data)
import qualified Control.Monad.State as S
import qualified Control.Exception as E
import Control.Applicative ((<$>))
import Control.Monad (msum, unless, MonadPlus(..))
import Text.Pandoc.Pretty (charWidth)
import Text.Pandoc.Compat.Locale (defaultTimeLocale)
import Data.Time
import Data.Time.Clock.POSIX
import System.IO (stderr)
import System.IO.Temp
import Text.HTML.TagSoup (renderTagsOptions, RenderOptions(..), Tag(..),
renderOptions)
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as B8
import Text.Pandoc.Compat.Monoid
import Data.ByteString.Base64 (decodeLenient)
import Data.Sequence (ViewR(..), ViewL(..), viewl, viewr)
import qualified Data.Text as T (toUpper, pack, unpack)
import Data.ByteString.Lazy (toChunks, fromChunks)
import qualified Data.ByteString.Lazy as BL
#ifdef EMBED_DATA_FILES
import Text.Pandoc.Data (dataFiles)
#else
import Paths_pandoc (getDataFileName)
#endif
#ifdef HTTP_CLIENT
import Network.HTTP.Client (httpLbs, parseUrl,
responseBody, responseHeaders,
Request(port,host))
#if MIN_VERSION_http_client(0,4,18)
import Network.HTTP.Client (newManager)
#else
import Network.HTTP.Client (withManager)
#endif
import Network.HTTP.Client.Internal (addProxy)
import Network.HTTP.Client.TLS (tlsManagerSettings)
import System.Environment (getEnv)
import Network.HTTP.Types.Header ( hContentType)
import Network (withSocketsDo)
import Codec.Archive.Zip
#else
import Network.URI (parseURI)
import Network.HTTP (findHeader, rspBody,
RequestMethod(..), HeaderName(..), mkRequest)
import Network.Browser (browse, setAllowRedirects, setOutHandler, request)
#endif
--
-- 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
--
-- | 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
-- | 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 =
if x >= 4000 || x < 0
then "?"
else case x of
_ | 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)
_ -> ""
-- | Escape whitespace in URI.
escapeURI :: String -> String
escapeURI = escapeURIString (not . isSpace)
-- | Convert tabs to spaces and filter out DOS line endings.
-- Tabs will be preserved if tab stop is set to 0.
tabFilter :: Int -- ^ Tab stop
-> String -- ^ Input
-> String
tabFilter tabStop =
let go _ [] = ""
go _ ('\n':xs) = '\n' : go tabStop xs
go _ ('\r':'\n':xs) = '\n' : go tabStop xs
go _ ('\r':xs) = '\n' : go tabStop xs
go spsToNextStop ('\t':xs) =
if tabStop == 0
then '\t' : go tabStop xs
else replicate spsToNextStop ' ' ++ go tabStop xs
go 1 (x:xs) =
x : go tabStop xs
go spsToNextStop (x:xs) =
x : go (spsToNextStop - 1) xs
in go tabStop
--
-- Date/time
--
-- | Parse a date and convert (if possible) to "YYYY-MM-DD" format.
normalizeDate :: String -> Maybe String
normalizeDate s = fmap (formatTime defaultTimeLocale "%F")
(msum $ map (\fs -> parsetimeWith fs s) formats :: Maybe Day)
where parsetimeWith = parseTime defaultTimeLocale
formats = ["%x","%m/%d/%Y", "%D","%F", "%d %b %Y",
"%d %B %Y", "%b. %d, %Y", "%B %d, %Y", "%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
-- | Normalize a list of inline elements: remove leading and trailing
-- @Space@ elements, collapse double @Space@s into singles, and
-- remove empty Str elements.
normalizeSpaces :: [Inline] -> [Inline]
normalizeSpaces = cleanup . dropWhile isSpaceOrEmpty
where cleanup [] = []
cleanup (Space:rest) = case dropWhile isSpaceOrEmpty rest of
[] -> []
(x:xs) -> Space : x : cleanup xs
cleanup ((Str ""):rest) = cleanup rest
cleanup (x:rest) = x : cleanup rest
isSpaceOrEmpty :: Inline -> Bool
isSpaceOrEmpty Space = True
isSpaceOrEmpty (Str "") = True
isSpaceOrEmpty _ = False
-- | Extract the leading and trailing spaces from inside an inline element
-- and place them outside the element.
extractSpaces :: (Inlines -> Inlines) -> Inlines -> Inlines
extractSpaces f is =
let contents = B.unMany is
left = case viewl contents of
(Space :< _) -> B.space
_ -> mempty
right = case viewr contents of
(_ :> Space) -> B.space
_ -> mempty in
(left <> f (B.trimInlines . B.Many $ contents) <> right)
-- | Normalize @Pandoc@ document, consolidating doubled 'Space's,
-- combining adjacent 'Str's and 'Emph's, remove 'Null's and
-- empty elements, etc.
normalize :: Pandoc -> Pandoc
normalize (Pandoc (Meta meta) blocks) =
Pandoc (Meta $ M.map go meta) (normalizeBlocks blocks)
where go (MetaInlines xs) = MetaInlines $ normalizeInlines xs
go (MetaBlocks xs) = MetaBlocks $ normalizeBlocks xs
go (MetaList ms) = MetaList $ map go ms
go (MetaMap m) = MetaMap $ M.map go m
go x = x
normalizeBlocks :: [Block] -> [Block]
normalizeBlocks (Null : xs) = normalizeBlocks xs
normalizeBlocks (Div attr bs : xs) =
Div attr (normalizeBlocks bs) : normalizeBlocks xs
normalizeBlocks (BlockQuote bs : xs) =
case normalizeBlocks bs of
[] -> normalizeBlocks xs
bs' -> BlockQuote bs' : normalizeBlocks xs
normalizeBlocks (BulletList [] : xs) = normalizeBlocks xs
normalizeBlocks (BulletList items : xs) =
BulletList (map normalizeBlocks items) : normalizeBlocks xs
normalizeBlocks (OrderedList _ [] : xs) = normalizeBlocks xs
normalizeBlocks (OrderedList attr items : xs) =
OrderedList attr (map normalizeBlocks items) : normalizeBlocks xs
normalizeBlocks (DefinitionList [] : xs) = normalizeBlocks xs
normalizeBlocks (DefinitionList items : xs) =
DefinitionList (map go items) : normalizeBlocks xs
where go (ils, bs) = (normalizeInlines ils, map normalizeBlocks bs)
normalizeBlocks (RawBlock _ "" : xs) = normalizeBlocks xs
normalizeBlocks (RawBlock f x : xs) =
case normalizeBlocks xs of
(RawBlock f' x' : rest) | f' == f ->
RawBlock f (x ++ ('\n':x')) : rest
rest -> RawBlock f x : rest
normalizeBlocks (Para ils : xs) =
case normalizeInlines ils of
[] -> normalizeBlocks xs
ils' -> Para ils' : normalizeBlocks xs
normalizeBlocks (Plain ils : xs) =
case normalizeInlines ils of
[] -> normalizeBlocks xs
ils' -> Plain ils' : normalizeBlocks xs
normalizeBlocks (Header lev attr ils : xs) =
Header lev attr (normalizeInlines ils) : normalizeBlocks xs
normalizeBlocks (Table capt aligns widths hdrs rows : xs) =
Table (normalizeInlines capt) aligns widths
(map normalizeBlocks hdrs) (map (map normalizeBlocks) rows)
: normalizeBlocks xs
normalizeBlocks (x:xs) = x : normalizeBlocks xs
normalizeBlocks [] = []
normalizeInlines :: [Inline] -> [Inline]
normalizeInlines (Str x : ys) =
case concat (x : map fromStr strs) of
"" -> rest
n -> Str n : rest
where
(strs, rest) = span isStr $ normalizeInlines ys
isStr (Str _) = True
isStr _ = False
fromStr (Str z) = z
fromStr _ = error "normalizeInlines - fromStr - not a Str"
normalizeInlines (Space : ys) =
if null rest
then []
else Space : rest
where isSp Space = True
isSp _ = False
rest = dropWhile isSp $ normalizeInlines ys
normalizeInlines (Emph xs : zs) =
case normalizeInlines zs of
(Emph ys : rest) -> normalizeInlines $
Emph (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> Emph xs' : rest
normalizeInlines (Strong xs : zs) =
case normalizeInlines zs of
(Strong ys : rest) -> normalizeInlines $
Strong (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> Strong xs' : rest
normalizeInlines (Subscript xs : zs) =
case normalizeInlines zs of
(Subscript ys : rest) -> normalizeInlines $
Subscript (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> Subscript xs' : rest
normalizeInlines (Superscript xs : zs) =
case normalizeInlines zs of
(Superscript ys : rest) -> normalizeInlines $
Superscript (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> Superscript xs' : rest
normalizeInlines (SmallCaps xs : zs) =
case normalizeInlines zs of
(SmallCaps ys : rest) -> normalizeInlines $
SmallCaps (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> SmallCaps xs' : rest
normalizeInlines (Strikeout xs : zs) =
case normalizeInlines zs of
(Strikeout ys : rest) -> normalizeInlines $
Strikeout (normalizeInlines $ xs ++ ys) : rest
rest -> case normalizeInlines xs of
[] -> rest
xs' -> Strikeout xs' : rest
normalizeInlines (RawInline _ [] : ys) = normalizeInlines ys
normalizeInlines (RawInline f xs : zs) =
case normalizeInlines zs of
(RawInline f' ys : rest) | f == f' -> normalizeInlines $
RawInline f (xs ++ ys) : rest
rest -> RawInline f xs : rest
normalizeInlines (Code _ "" : ys) = normalizeInlines ys
normalizeInlines (Code attr xs : zs) =
case normalizeInlines zs of
(Code attr' ys : rest) | attr == attr' -> normalizeInlines $
Code attr (xs ++ ys) : rest
rest -> Code attr xs : rest
-- allow empty spans, they may carry identifiers etc.
-- normalizeInlines (Span _ [] : ys) = normalizeInlines ys
normalizeInlines (Span attr xs : zs) =
case normalizeInlines zs of
(Span attr' ys : rest) | attr == attr' -> normalizeInlines $
Span attr (normalizeInlines $ xs ++ ys) : rest
rest -> Span attr (normalizeInlines xs) : rest
normalizeInlines (Note bs : ys) = Note (normalizeBlocks bs) :
normalizeInlines ys
normalizeInlines (Quoted qt ils : ys) =
Quoted qt (normalizeInlines ils) : normalizeInlines ys
normalizeInlines (Link attr ils t : ys) =
Link attr (normalizeInlines ils) t : normalizeInlines ys
normalizeInlines (Image attr ils t : ys) =
Image attr (normalizeInlines ils) t : normalizeInlines ys
normalizeInlines (Cite cs ils : ys) =
Cite cs (normalizeInlines ils) : normalizeInlines ys
normalizeInlines (x : xs) = x : normalizeInlines xs
normalizeInlines [] = []
-- | Extract inlines, removing formatting.
removeFormatting :: Walkable Inline a => a -> [Inline]
removeFormatting = query go . walk deNote
where go :: Inline -> [Inline]
go (Str xs) = [Str xs]
go Space = [Space]
go (Code _ x) = [Str x]
go (Math _ x) = [Str x]
go LineBreak = [Space]
go _ = []
deNote (Note _) = Str ""
deNote 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
where go :: Inline -> [Char]
go Space = " "
go (Str x) = x
go (Code _ x) = x
go (Math _ x) = x
go LineBreak = " "
go _ = ""
deNote (Note _) = Str ""
deNote x = x
-- | 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.
compactify :: [[Block]] -- ^ List of list items (each a list of blocks)
-> [[Block]]
compactify [] = []
compactify items =
case (init items, last items) of
(_,[]) -> items
(others, final) ->
case last final of
Para a -> case (filter isPara $ concat items) of
-- if this is only Para, change to Plain
[_] -> others ++ [init final ++ [Plain a]]
_ -> items
_ -> items
-- | Change final list item from @Para@ to @Plain@ if the list contains
-- no other @Para@ blocks. Like compactify, but operates on @Blocks@ rather
-- than @[Block]@.
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) -> case [Para x | Para x <- concatMap B.toList items] of
-- if this is only Para, change to Plain
[_] -> others ++ [B.fromList (reverse $ Plain a : xs)]
_ -> items
_ -> items
-- | Like @compactify'@, but acts on items of definition lists.
compactify'DL :: [(Inlines, [Blocks])] -> [(Inlines, [Blocks])]
compactify'DL 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
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 <> 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 <> 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 :: [Inline] -> String
inlineListToIdentifier =
dropWhile (not . isAlpha) . intercalate "-" . words .
map (nbspToSp . toLower) .
filter (\c -> isLetter c || isDigit c || c `elem` "_-. ") .
stringify
where nbspToSp '\160' = ' '
nbspToSp x = x
-- | 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 ("",["references"],[])
(Header level (ident,classes,kvs) title' : xs)):ys) =
hierarchicalizeWithIds ((Header level (ident,("references":classes),kvs)
title') : (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 :: [Inline] -> [String] -> String
uniqueIdent title' usedIdents
= let baseIdent = case inlineListToIdentifier title' of
"" -> "section"
x -> x
numIdent n = baseIdent ++ "-" ++ show n
in if baseIdent `elem` usedIdents
then case find (\x -> numIdent x `notElem` usedIdents) ([1..60000] :: [Int]) of
Just x -> numIdent x
Nothing -> baseIdent -- if we have more than 60,000, allow repeats
else baseIdent
-- | 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
-- | Detect if a list is tight.
isTightList :: [[Block]] -> Bool
isTightList = all firstIsPlain
where firstIsPlain (Plain _ : _) = True
firstIsPlain _ = False
-- | 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
--
-- 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)
getDefaultReferenceDocx :: Maybe FilePath -> IO Archive
getDefaultReferenceDocx datadir = do
let paths = ["[Content_Types].xml",
"_rels/.rels",
"docProps/app.xml",
"docProps/core.xml",
"word/document.xml",
"word/fontTable.xml",
"word/footnotes.xml",
"word/numbering.xml",
"word/settings.xml",
"word/webSettings.xml",
"word/styles.xml",
"word/_rels/document.xml.rels",
"word/_rels/footnotes.xml.rels",
"word/theme/theme1.xml"]
let toLazy = fromChunks . (:[])
let pathToEntry path = do epochtime <- (floor . utcTimeToPOSIXSeconds) <$>
getCurrentTime
contents <- toLazy <$> readDataFile datadir
("docx/" ++ path)
return $ toEntry path epochtime contents
mbArchive <- case datadir of
Nothing -> return Nothing
Just d -> do
exists <- doesFileExist (d </> "reference.docx")
if exists
then return (Just (d </> "reference.docx"))
else return Nothing
case mbArchive of
Just arch -> toArchive <$> BL.readFile arch
Nothing -> foldr addEntryToArchive emptyArchive <$>
mapM pathToEntry paths
getDefaultReferenceODT :: Maybe FilePath -> IO Archive
getDefaultReferenceODT datadir = do
let paths = ["mimetype",
"manifest.rdf",
"styles.xml",
"content.xml",
"meta.xml",
"settings.xml",
"Configurations2/accelerator/current.xml",
"Thumbnails/thumbnail.png",
"META-INF/manifest.xml"]
let pathToEntry path = do epochtime <- floor `fmap` getPOSIXTime
contents <- (fromChunks . (:[])) `fmap`
readDataFile datadir ("odt/" ++ path)
return $ toEntry path epochtime contents
mbArchive <- case datadir of
Nothing -> return Nothing
Just d -> do
exists <- doesFileExist (d </> "reference.odt")
if exists
then return (Just (d </> "reference.odt"))
else return Nothing
case mbArchive of
Just arch -> toArchive <$> BL.readFile arch
Nothing -> foldr addEntryToArchive emptyArchive <$>
mapM pathToEntry paths
readDefaultDataFile :: FilePath -> IO BS.ByteString
readDefaultDataFile "reference.docx" =
(BS.concat . toChunks . fromArchive) <$> getDefaultReferenceDocx Nothing
readDefaultDataFile "reference.odt" =
(BS.concat . toChunks . fromArchive) <$> getDefaultReferenceODT Nothing
readDefaultDataFile fname =
#ifdef EMBED_DATA_FILES
case lookup (makeCanonical fname) dataFiles of
Nothing -> err 97 $ "Could not find data file " ++ fname
Just contents -> return contents
where makeCanonical = joinPath . transformPathParts . splitDirectories
transformPathParts = reverse . foldl go []
go as "." = as
go (_:as) ".." = as
go as x = x : as
#else
getDataFileName fname' >>= checkExistence >>= BS.readFile
where fname' = if fname == "README" then fname else "data" </> fname
#endif
checkExistence :: FilePath -> IO FilePath
checkExistence fn = do
exists <- doesFileExist fn
if exists
then return fn
else err 97 ("Could not find data file " ++ fn)
-- | Read file from specified user data directory or, if not found there, from
-- Cabal data directory.
readDataFile :: Maybe FilePath -> FilePath -> IO BS.ByteString
readDataFile Nothing fname = readDefaultDataFile fname
readDataFile (Just userDir) fname = do
exists <- doesFileExist (userDir </> fname)
if exists
then BS.readFile (userDir </> fname)
else readDefaultDataFile fname
-- | Same as 'readDataFile' but returns a String instead of a ByteString.
readDataFileUTF8 :: Maybe FilePath -> FilePath -> IO String
readDataFileUTF8 userDir fname =
UTF8.toString `fmap` readDataFile userDir fname
-- | Fetch an image or other item from the local filesystem or the net.
-- Returns raw content and maybe mime type.
fetchItem :: Maybe String -> String
-> IO (Either E.SomeException (BS.ByteString, Maybe MimeType))
fetchItem sourceURL s =
case (sourceURL >>= parseURIReference . ensureEscaped, ensureEscaped s) of
(_, s') | isURI s' -> openURL s'
(Just u, s') -> -- try fetching from relative path at source
case parseURIReference s' of
Just u' -> openURL $ show $ u' `nonStrictRelativeTo` u
Nothing -> openURL s' -- will throw error
(Nothing, _) -> E.try readLocalFile -- get from local file system
where readLocalFile = do
cont <- BS.readFile fp
return (cont, mime)
dropFragmentAndQuery = takeWhile (\c -> c /= '?' && c /= '#')
fp = unEscapeString $ dropFragmentAndQuery s
mime = case takeExtension fp of
".gz" -> getMimeType $ dropExtension fp
".svgz" -> getMimeType $ dropExtension fp ++ ".svg"
x -> getMimeType x
ensureEscaped x@(_:':':'\\':_) = x -- likely windows path
ensureEscaped x = escapeURIString isAllowedInURI x
-- | Like 'fetchItem', but also looks for items in a 'MediaBag'.
fetchItem' :: MediaBag -> Maybe String -> String
-> IO (Either E.SomeException (BS.ByteString, Maybe MimeType))
fetchItem' media sourceURL s = do
case lookupMedia s media of
Nothing -> fetchItem sourceURL s
Just (mime, bs) -> return $ Right (BS.concat $ toChunks bs, Just mime)
-- | Read from a URL and return raw data and maybe mime type.
openURL :: String -> IO (Either E.SomeException (BS.ByteString, Maybe MimeType))
openURL u
| Just u' <- stripPrefix "data:" u =
let mime = takeWhile (/=',') u'
contents = B8.pack $ unEscapeString $ drop 1 $ dropWhile (/=',') u'
in return $ Right (decodeLenient contents, Just mime)
#ifdef HTTP_CLIENT
| otherwise = withSocketsDo $ E.try $ do
req <- parseUrl u
(proxy :: Either E.SomeException String) <- E.try $ getEnv "http_proxy"
let req' = case proxy of
Left _ -> req
Right pr -> case parseUrl pr of
Just r -> addProxy (host r) (port r) req
Nothing -> req
#if MIN_VERSION_http_client(0,4,18)
resp <- newManager tlsManagerSettings >>= httpLbs req'
#else
resp <- withManager tlsManagerSettings $ httpLbs req'
#endif
return (BS.concat $ toChunks $ responseBody resp,
UTF8.toString `fmap` lookup hContentType (responseHeaders resp))
#else
| otherwise = E.try $ getBodyAndMimeType `fmap` browse
(do S.liftIO $ UTF8.hPutStrLn stderr $ "Fetching " ++ u ++ "..."
setOutHandler $ const (return ())
setAllowRedirects True
request (getRequest' u'))
where getBodyAndMimeType (_, r) = (rspBody r, findHeader HdrContentType r)
getRequest' uriString = case parseURI uriString of
Nothing -> error ("Not a valid URL: " ++
uriString)
Just v -> mkRequest GET v
u' = escapeURIString (/= '|') u -- pipes are rejected by Network.URI
#endif
--
-- Error reporting
--
err :: Int -> String -> IO a
err exitCode msg = do
name <- getProgName
UTF8.hPutStrLn stderr $ name ++ ": " ++ msg
exitWith $ ExitFailure exitCode
return undefined
warn :: String -> IO ()
warn msg = do
name <- getProgName
UTF8.hPutStrLn stderr $ name ++ ": " ++ msg
mapLeft :: (a -> b) -> Either a c -> Either b c
mapLeft f (Left x) = Left (f x)
mapLeft _ (Right x) = Right x
hush :: Either a b -> Maybe b
hush (Left _) = Nothing
hush (Right x) = Just x
-- | 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 = 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) = [[pathSeparator]]
go rs x = x:rs
isSingleton [] = Nothing
isSingleton [x] = Just x
isSingleton _ = Nothing
checkPathSeperator = fmap isPathSeparator . isSingleton
--
-- 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
--
withTempDir :: String -> (FilePath -> IO a) -> IO a
withTempDir =
#ifdef _WINDOWS
withTempDirectory "."
#else
withSystemTempDirectory
#endif
|