hslua-1.2.0: Bindings to Lua, an embeddable scripting language

Copyright© 2007–2012 Gracjan Polak
2012–2016 Ömer Sinan Ağacan
2017-2020 Albert Krewinkel
LicenseMIT
MaintainerAlbert Krewinkel <tarleb+hslua@zeitkraut.de>
Stabilitybeta
PortabilityFlexibleInstances, ForeignFunctionInterface, ScopedTypeVariables
Safe HaskellNone
LanguageHaskell2010

Foreign.Lua.FunctionCalling

Description

Call haskell functions from Lua, and vice versa.

Synopsis

Documentation

class Peekable a where Source #

A value that can be read from the Lua stack.

Methods

peek :: StackIndex -> Lua a Source #

Check if at index n there is a convertible Lua value and if so return it. Throws a Exception otherwise.

Instances
Peekable Bool Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Double Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Float Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Int Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua Int Source #

Peekable Integer Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable () Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua () Source #

Peekable ByteString Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable ByteString Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Text Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Number Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable Integer Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable CFunction Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable State Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Peekable [Char] Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua [Char] Source #

Peekable a => Peekable [a] Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua [a] Source #

Peekable (Ptr a) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (Ptr a) Source #

(Ord a, Peekable a) => Peekable (Set a) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (Set a) Source #

Peekable a => Peekable (Optional a) Source # 
Instance details

Defined in Foreign.Lua.Util

Methods

peek :: StackIndex -> Lua (Optional a) Source #

(Peekable a, Peekable b) => Peekable (a, b) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b) Source #

(Ord a, Peekable a, Peekable b) => Peekable (Map a b) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (Map a b) Source #

(Peekable a, Peekable b, Peekable c) => Peekable (a, b, c) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c) Source #

(Peekable a, Peekable b, Peekable c, Peekable d) => Peekable (a, b, c, d) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c, d) Source #

(Peekable a, Peekable b, Peekable c, Peekable d, Peekable e) => Peekable (a, b, c, d, e) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c, d, e) Source #

(Peekable a, Peekable b, Peekable c, Peekable d, Peekable e, Peekable f) => Peekable (a, b, c, d, e, f) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c, d, e, f) Source #

(Peekable a, Peekable b, Peekable c, Peekable d, Peekable e, Peekable f, Peekable g) => Peekable (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c, d, e, f, g) Source #

(Peekable a, Peekable b, Peekable c, Peekable d, Peekable e, Peekable f, Peekable g, Peekable h) => Peekable (a, b, c, d, e, f, g, h) Source # 
Instance details

Defined in Foreign.Lua.Types.Peekable

Methods

peek :: StackIndex -> Lua (a, b, c, d, e, f, g, h) Source #

class LuaCallFunc a where Source #

Helper class used to make lua functions useable from haskell

Methods

callFunc' :: String -> Lua () -> NumArgs -> a Source #

Instances
Peekable a => LuaCallFunc (Lua a) Source # 
Instance details

Defined in Foreign.Lua.FunctionCalling

Methods

callFunc' :: String -> Lua () -> NumArgs -> Lua a Source #

(Pushable a, LuaCallFunc b) => LuaCallFunc (a -> b) Source # 
Instance details

Defined in Foreign.Lua.FunctionCalling

Methods

callFunc' :: String -> Lua () -> NumArgs -> a -> b Source #

class ToHaskellFunction a where Source #

Operations and functions that can be pushed to the Lua stack. This is a helper function not intended to be used directly. Use the toHaskellFunction wrapper instead.

Methods

toHsFun :: StackIndex -> a -> Lua NumResults Source #

Helper function, called by toHaskellFunction

type HaskellFunction = Lua NumResults Source #

Haskell function that can be called from Lua.

class Pushable a where Source #

A value that can be pushed to the Lua stack.

Methods

push :: a -> Lua () Source #

Pushes a value onto Lua stack, casting it into meaningfully nearest Lua type.

Instances
Pushable Bool Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Bool -> Lua () Source #

Pushable Double Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Double -> Lua () Source #

Pushable Float Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Float -> Lua () Source #

Pushable Int Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Int -> Lua () Source #

Pushable Integer Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Integer -> Lua () Source #

Pushable () Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: () -> Lua () Source #

Pushable ByteString Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: ByteString -> Lua () Source #

Pushable ByteString Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: ByteString -> Lua () Source #

Pushable Text Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Text -> Lua () Source #

Pushable Number Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Number -> Lua () Source #

Pushable Integer Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Integer -> Lua () Source #

Pushable CFunction Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: CFunction -> Lua () Source #

Pushable [Char] Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: [Char] -> Lua () Source #

Pushable a => Pushable [a] Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: [a] -> Lua () Source #

Pushable (Ptr a) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Ptr a -> Lua () Source #

Pushable a => Pushable (Set a) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Set a -> Lua () Source #

Pushable a => Pushable (Optional a) Source # 
Instance details

Defined in Foreign.Lua.Util

Methods

push :: Optional a -> Lua () Source #

(Pushable a, Pushable b) => Pushable (a, b) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b) -> Lua () Source #

(Pushable a, Pushable b) => Pushable (Map a b) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: Map a b -> Lua () Source #

(Pushable a, Pushable b, Pushable c) => Pushable (a, b, c) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c) -> Lua () Source #

(Pushable a, Pushable b, Pushable c, Pushable d) => Pushable (a, b, c, d) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c, d) -> Lua () Source #

(Pushable a, Pushable b, Pushable c, Pushable d, Pushable e) => Pushable (a, b, c, d, e) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c, d, e) -> Lua () Source #

(Pushable a, Pushable b, Pushable c, Pushable d, Pushable e, Pushable f) => Pushable (a, b, c, d, e, f) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c, d, e, f) -> Lua () Source #

(Pushable a, Pushable b, Pushable c, Pushable d, Pushable e, Pushable f, Pushable g) => Pushable (a, b, c, d, e, f, g) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c, d, e, f, g) -> Lua () Source #

(Pushable a, Pushable b, Pushable c, Pushable d, Pushable e, Pushable f, Pushable g, Pushable h) => Pushable (a, b, c, d, e, f, g, h) Source # 
Instance details

Defined in Foreign.Lua.Types.Pushable

Methods

push :: (a, b, c, d, e, f, g, h) -> Lua () Source #

type PreCFunction = State -> IO NumResults Source #

Type of raw Haskell functions that can be made into CFunctions.

toHaskellFunction :: ToHaskellFunction a => a -> HaskellFunction Source #

Convert a Haskell function to Lua function. Any Haskell function can be converted provided that:

  • all arguments are instances of Peekable
  • return type is Lua a, where a is an instance of Pushable

Any Exception will be converted to a string and returned as Lua error.

Important: this does not catch exceptions other than Exception; exception handling must be done by the converted Haskell function. Failure to do so will cause the program to crash.

E.g., the following code could be used to handle an Exception of type FooException, if that type is an instance of MonadCatch and Pushable:

toHaskellFunction (myFun `catchM` (\e -> raiseError (e :: FooException)))

callFunc :: LuaCallFunc a => String -> a Source #

Call a Lua function. Use as:

v <- callfunc "proc" "abc" (1::Int) (5.0::Double)

freeCFunction :: CFunction -> Lua () Source #

Free function pointer created with newcfunction.

newCFunction :: ToHaskellFunction a => a -> Lua CFunction Source #

Create new foreign Lua function. Function created can be called by the Lua engine. Remeber to free the pointer with freecfunction.

pushHaskellFunction :: ToHaskellFunction a => a -> Lua () Source #

Pushes Haskell function as a callable userdata. All values created will be garbage collected. Use as:

pushHaskellFunction myfun
setglobal "myfun"

Error conditions should be indicated by raising a Lua Exception or by returning the result of error.

pushPreCFunction :: PreCFunction -> Lua () Source #

Converts a pre C function to a Lua function and pushes it to the stack.

Pre C functions collect parameters from the stack and return a CInt that represents number of return values left on the stack.

registerHaskellFunction :: ToHaskellFunction a => String -> a -> Lua () Source #

Imports a Haskell function and registers it at global name.