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
|
{-
Copyright © 2012-2016 John MacFarlane <jgm@berkeley.edu>
2017 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
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.Lua.Util
Copyright : © 2012–2016 John MacFarlane,
© 2017 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Lua utility functions.
-}
module Text.Pandoc.Lua.Util
( adjustIndexBy
, getTable
, setTable
, addValue
, getRawInt
, setRawInt
, addRawInt
) where
import Scripting.Lua
( LuaState, StackValue(..)
, gettable, pop, rawgeti, rawseti, settable
)
-- | Adjust the stack index, assuming that @n@ new elements have been pushed on
-- the stack.
adjustIndexBy :: Int -> Int -> Int
adjustIndexBy idx n =
if idx < 0
then idx - n
else idx
-- | Get value behind key from table at given index.
getTable :: (StackValue a, StackValue b) => LuaState -> Int -> a -> IO (Maybe b)
getTable lua idx key = do
push lua key
gettable lua (idx `adjustIndexBy` 1)
peek lua (-1) <* pop lua 1
-- | Set value for key for table at the given index
setTable :: (StackValue a, StackValue b) => LuaState -> Int -> a -> b -> IO ()
setTable lua idx key value = do
push lua key
push lua value
settable lua (idx `adjustIndexBy` 2)
-- | Add a key-value pair to the table at the top of the stack
addValue :: (StackValue a, StackValue b) => LuaState -> a -> b -> IO ()
addValue lua = setTable lua (-1)
-- | Get value behind key from table at given index.
getRawInt :: StackValue a => LuaState -> Int -> Int -> IO (Maybe a)
getRawInt lua idx key =
rawgeti lua idx key
*> peek lua (-1)
<* pop lua 1
-- | Set numeric key/value in table at the given index
setRawInt :: StackValue a => LuaState -> Int -> Int -> a -> IO ()
setRawInt lua idx key value = do
push lua value
rawseti lua (idx `adjustIndexBy` 1) key
-- | Set numeric key/value in table at the top of the stack.
addRawInt :: StackValue a => LuaState -> Int -> a -> IO ()
addRawInt lua = setRawInt lua (-1)
|
