1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Lua.Module.Utils
Copyright : Copyright © 2017-2019 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Utility module for lua, exposing internal helper functions.
-}
module Text.Pandoc.Lua.Module.Utils
( pushModule
) where
import Prelude
import Control.Applicative ((<|>))
import Data.Char (toLower)
import Data.Default (def)
import Data.Version (Version)
import Foreign.Lua (Peekable, Lua, NumResults)
import Text.Pandoc.Class (runIO, setUserDataDir)
import Text.Pandoc.Definition ( Pandoc, Meta, MetaValue (..), Block, Inline
, Citation, Attr, ListAttributes)
import Text.Pandoc.Lua.Marshaling ()
import Text.Pandoc.Lua.Util (addFunction)
import qualified Data.Digest.Pure.SHA as SHA
import qualified Data.ByteString.Lazy as BSL
import qualified Foreign.Lua as Lua
import qualified Text.Pandoc.Builder as B
import qualified Text.Pandoc.Filter.JSON as JSONFilter
import qualified Text.Pandoc.Shared as Shared
-- | Push the "pandoc.utils" module to the lua stack.
pushModule :: Maybe FilePath -> Lua NumResults
pushModule mbDatadir = do
Lua.newtable
addFunction "blocks_to_inlines" blocksToInlines
addFunction "equals" equals
addFunction "hierarchicalize" hierarchicalize
addFunction "normalize_date" normalizeDate
addFunction "run_json_filter" (runJSONFilter mbDatadir)
addFunction "sha1" sha1
addFunction "stringify" stringify
addFunction "to_roman_numeral" toRomanNumeral
addFunction "Version" (return :: Version -> Lua Version)
return 1
-- | Squashes a list of blocks into inlines.
blocksToInlines :: [Block] -> Lua.Optional [Inline] -> Lua [Inline]
blocksToInlines blks optSep = do
let sep = case Lua.fromOptional optSep of
Just x -> B.fromList x
Nothing -> Shared.defaultBlocksSeparator
return $ B.toList (Shared.blocksToInlinesWithSep sep blks)
-- | Convert list of Pandoc blocks into (hierarchical) list of Elements.
hierarchicalize :: [Block] -> Lua [Shared.Element]
hierarchicalize = return . Shared.hierarchicalize
-- | 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).
-- Returns nil instead of a string if the conversion failed.
normalizeDate :: String -> Lua (Lua.Optional String)
normalizeDate = return . Lua.Optional . Shared.normalizeDate
-- | Run a JSON filter on the given document.
runJSONFilter :: Maybe FilePath
-> Pandoc
-> FilePath
-> Lua.Optional [String]
-> Lua NumResults
runJSONFilter mbDatadir doc filterFile optArgs = do
args <- case Lua.fromOptional optArgs of
Just x -> return x
Nothing -> do
Lua.getglobal "FORMAT"
(:[]) <$> Lua.popValue
filterRes <- Lua.liftIO . runIO $ do
setUserDataDir mbDatadir
JSONFilter.apply def args filterFile doc
case filterRes of
Left err -> Lua.raiseError (show err)
Right d -> (1 :: NumResults) <$ Lua.push d
-- | Calculate the hash of the given contents.
sha1 :: BSL.ByteString
-> Lua String
sha1 = return . SHA.showDigest . SHA.sha1
-- | Convert pandoc structure to a string with formatting removed.
-- Footnotes are skipped (since we don't want their contents in link
-- labels).
stringify :: AstElement -> Lua String
stringify el = return $ case el of
PandocElement pd -> Shared.stringify pd
InlineElement i -> Shared.stringify i
BlockElement b -> Shared.stringify b
MetaElement m -> Shared.stringify m
CitationElement c -> Shared.stringify c
MetaValueElement m -> stringifyMetaValue m
_ -> ""
stringifyMetaValue :: MetaValue -> String
stringifyMetaValue mv = case mv of
MetaBool b -> map toLower (show b)
MetaString s -> s
_ -> Shared.stringify mv
equals :: AstElement -> AstElement -> Lua Bool
equals e1 e2 = return (e1 == e2)
data AstElement
= PandocElement Pandoc
| MetaElement Meta
| BlockElement Block
| InlineElement Inline
| MetaValueElement MetaValue
| AttrElement Attr
| ListAttributesElement ListAttributes
| CitationElement Citation
deriving (Eq, Show)
instance Peekable AstElement where
peek idx = do
res <- Lua.try $ (PandocElement <$> Lua.peek idx)
<|> (InlineElement <$> Lua.peek idx)
<|> (BlockElement <$> Lua.peek idx)
<|> (AttrElement <$> Lua.peek idx)
<|> (ListAttributesElement <$> Lua.peek idx)
<|> (MetaElement <$> Lua.peek idx)
<|> (MetaValueElement <$> Lua.peek idx)
case res of
Right x -> return x
Left _ -> Lua.throwException
"Expected an AST element, but could not parse value as such."
-- | Convert a number < 4000 to uppercase roman numeral.
toRomanNumeral :: Lua.Integer -> Lua String
toRomanNumeral = return . Shared.toRomanNumeral . fromIntegral
|
