{-# LANGUAGE OverloadedStrings #-}
module Text.Pandoc.Lua.Util
( addField
, callWithTraceback
, pcallWithTraceback
, dofileWithTraceback
, peekViaJSON
, pushViaJSON
) where
import Control.Monad (when)
import HsLua
import HsLua.Aeson (peekValue, pushValue)
import qualified Data.Aeson as Aeson
import qualified HsLua as Lua
import qualified Text.Pandoc.UTF8 as UTF8
addField :: (LuaError e, Pushable a) => String -> a -> LuaE e ()
addField :: forall e a. (LuaError e, Pushable a) => String -> a -> LuaE e ()
addField String
key a
value = do
String -> LuaE e ()
forall a e. (Pushable a, LuaError e) => a -> LuaE e ()
Lua.push String
key
a -> LuaE e ()
forall a e. (Pushable a, LuaError e) => a -> LuaE e ()
Lua.push a
value
StackIndex -> LuaE e ()
forall e. LuaError e => StackIndex -> LuaE e ()
Lua.rawset (CInt -> StackIndex
Lua.nth CInt
3)
pcallWithTraceback :: LuaError e => NumArgs -> NumResults -> LuaE e Status
pcallWithTraceback :: forall e. LuaError e => NumArgs -> NumResults -> LuaE e Status
pcallWithTraceback NumArgs
nargs NumResults
nresults = do
let traceback' :: LuaError e => LuaE e NumResults
traceback' :: forall e. LuaError e => LuaE e NumResults
traceback' = do
State
l <- LuaE e State
forall e. LuaE e State
Lua.state
ByteString
msg <- StackIndex -> LuaE e ByteString
forall e. LuaError e => StackIndex -> LuaE e ByteString
Lua.tostring' (CInt -> StackIndex
Lua.nthBottom CInt
1)
State -> Maybe ByteString -> Int -> LuaE e ()
forall e. State -> Maybe ByteString -> Int -> LuaE e ()
Lua.traceback State
l (ByteString -> Maybe ByteString
forall a. a -> Maybe a
Just ByteString
msg) Int
2
NumResults -> LuaE e NumResults
forall (m :: * -> *) a. Monad m => a -> m a
return NumResults
1
StackIndex
tracebackIdx <- StackIndex -> LuaE e StackIndex
forall e. StackIndex -> LuaE e StackIndex
Lua.absindex (CInt -> StackIndex
Lua.nth (NumArgs -> CInt
Lua.fromNumArgs NumArgs
nargs CInt -> CInt -> CInt
forall a. Num a => a -> a -> a
+ CInt
1))
HaskellFunction e -> LuaE e ()
forall e. LuaError e => HaskellFunction e -> LuaE e ()
Lua.pushHaskellFunction HaskellFunction e
forall e. LuaError e => LuaE e NumResults
traceback'
StackIndex -> LuaE e ()
forall e. StackIndex -> LuaE e ()
Lua.insert StackIndex
tracebackIdx
Status
result <- NumArgs -> NumResults -> Maybe StackIndex -> LuaE e Status
forall e.
NumArgs -> NumResults -> Maybe StackIndex -> LuaE e Status
Lua.pcall NumArgs
nargs NumResults
nresults (StackIndex -> Maybe StackIndex
forall a. a -> Maybe a
Just StackIndex
tracebackIdx)
StackIndex -> LuaE e ()
forall e. StackIndex -> LuaE e ()
Lua.remove StackIndex
tracebackIdx
Status -> LuaE e Status
forall (m :: * -> *) a. Monad m => a -> m a
return Status
result
callWithTraceback :: LuaError e => NumArgs -> NumResults -> LuaE e ()
callWithTraceback :: forall e. LuaError e => NumArgs -> NumResults -> LuaE e ()
callWithTraceback NumArgs
nargs NumResults
nresults = do
Status
result <- NumArgs -> NumResults -> LuaE e Status
forall e. LuaError e => NumArgs -> NumResults -> LuaE e Status
pcallWithTraceback NumArgs
nargs NumResults
nresults
Bool -> LuaE e () -> LuaE e ()
forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Status
result Status -> Status -> Bool
forall a. Eq a => a -> a -> Bool
/= Status
Lua.OK)
LuaE e ()
forall e a. LuaError e => LuaE e a
Lua.throwErrorAsException
dofileWithTraceback :: LuaError e => FilePath -> LuaE e Status
dofileWithTraceback :: forall e. LuaError e => String -> LuaE e Status
dofileWithTraceback String
fp = do
Status
loadRes <- String -> LuaE e Status
forall e. String -> LuaE e Status
Lua.loadfile String
fp
case Status
loadRes of
Status
Lua.OK -> NumArgs -> NumResults -> LuaE e Status
forall e. LuaError e => NumArgs -> NumResults -> LuaE e Status
pcallWithTraceback NumArgs
0 NumResults
Lua.multret
Status
_ -> Status -> LuaE e Status
forall (m :: * -> *) a. Monad m => a -> m a
return Status
loadRes
peekViaJSON :: (Aeson.FromJSON a, LuaError e) => Peeker e a
peekViaJSON :: forall a e. (FromJSON a, LuaError e) => Peeker e a
peekViaJSON StackIndex
idx = do
Value
value <- Peeker e Value
forall e. LuaError e => Peeker e Value
peekValue StackIndex
idx
case Value -> Result a
forall a. FromJSON a => Value -> Result a
Aeson.fromJSON Value
value of
Aeson.Success a
x -> a -> Peek e a
forall (f :: * -> *) a. Applicative f => a -> f a
pure a
x
Aeson.Error String
msg -> ByteString -> Peek e a
forall a e. ByteString -> Peek e a
failPeek (ByteString -> Peek e a) -> ByteString -> Peek e a
forall a b. (a -> b) -> a -> b
$ ByteString
"failed to decode: " ByteString -> ByteString -> ByteString
forall a. Semigroup a => a -> a -> a
<>
String -> ByteString
UTF8.fromString String
msg
pushViaJSON :: (Aeson.ToJSON a, LuaError e) => Pusher e a
pushViaJSON :: forall a e. (ToJSON a, LuaError e) => Pusher e a
pushViaJSON = Pusher e Value
forall e. LuaError e => Pusher e Value
pushValue Pusher e Value -> (a -> Value) -> a -> LuaE e ()
forall b c a. (b -> c) -> (a -> b) -> a -> c
. a -> Value
forall a. ToJSON a => a -> Value
Aeson.toJSON