blob: 4285be662157c293522bff20682857266e5a8f1d (
plain)
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
|
{-# LANGUAGE DeriveDataTypeable #-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017-2020 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Pandoc's Lua globals.
-}
module Text.Pandoc.Lua.Global
( Global (..)
, setGlobals
) where
import Data.Data (Data)
import Foreign.Lua (Lua, Peekable, Pushable)
import Foreign.Lua.Userdata ( ensureUserdataMetatable, pushAnyWithMetatable
, metatableName)
import Paths_pandoc (version)
import Text.Pandoc.Class.CommonState (CommonState)
import Text.Pandoc.Definition (Pandoc (Pandoc), pandocTypesVersion)
import Text.Pandoc.Lua.Marshaling ()
import Text.Pandoc.Lua.Util (addFunction)
import Text.Pandoc.Options (ReaderOptions)
import qualified Data.Text as Text
import qualified Foreign.Lua as Lua
-- | Permissible global Lua variables.
data Global =
FORMAT Text.Text
| PANDOC_API_VERSION
| PANDOC_DOCUMENT Pandoc
| PANDOC_READER_OPTIONS ReaderOptions
| PANDOC_SCRIPT_FILE FilePath
| PANDOC_STATE CommonState
| PANDOC_VERSION
-- Cannot derive instance of Data because of CommonState
-- | Set all given globals.
setGlobals :: [Global] -> Lua ()
setGlobals = mapM_ setGlobal
setGlobal :: Global -> Lua ()
setGlobal global = case global of
-- This could be simplified if Global was an instance of Data.
FORMAT format -> do
Lua.push format
Lua.setglobal "FORMAT"
PANDOC_API_VERSION -> do
Lua.push pandocTypesVersion
Lua.setglobal "PANDOC_API_VERSION"
PANDOC_DOCUMENT doc -> do
Lua.push (LazyPandoc doc)
Lua.setglobal "PANDOC_DOCUMENT"
PANDOC_READER_OPTIONS ropts -> do
Lua.push ropts
Lua.setglobal "PANDOC_READER_OPTIONS"
PANDOC_SCRIPT_FILE filePath -> do
Lua.push filePath
Lua.setglobal "PANDOC_SCRIPT_FILE"
PANDOC_STATE commonState -> do
Lua.push commonState
Lua.setglobal "PANDOC_STATE"
PANDOC_VERSION -> do
Lua.push version
Lua.setglobal "PANDOC_VERSION"
-- | Readonly and lazy pandoc objects.
newtype LazyPandoc = LazyPandoc Pandoc
deriving (Data)
instance Pushable LazyPandoc where
push lazyDoc = pushAnyWithMetatable pushPandocMetatable lazyDoc
where
pushPandocMetatable = ensureUserdataMetatable (metatableName lazyDoc) $
addFunction "__index" indexLazyPandoc
instance Peekable LazyPandoc where
peek = Lua.peekAny
indexLazyPandoc :: LazyPandoc -> String -> Lua Lua.NumResults
indexLazyPandoc (LazyPandoc (Pandoc meta blks)) field = 1 <$
case field of
"blocks" -> Lua.push blks
"meta" -> Lua.push meta
_ -> Lua.pushnil
|
