Copyright | © 2007–2012 Gracjan Polak; © 2012–2016 Ömer Sinan Ağacan; © 2017-2024 Albert Krewinkel |
---|---|
License | MIT |
Maintainer | Albert Krewinkel <tarleb@hslua.org> |
Stability | beta |
Portability | non-portable (depends on GHC) |
Safe Haskell | Safe-Inferred |
Language | Haskell2010 |
Expose Haskell functions as Lua closures.
Synopsis
- pushPreCFunction :: PreCFunction -> LuaE e ()
- pushHaskellFunction :: LuaError e => HaskellFunction e -> LuaE e ()
Documentation
pushPreCFunction :: PreCFunction -> LuaE e () 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.
See CFunction
for more info.
pushHaskellFunction :: LuaError e => HaskellFunction e -> LuaE e () Source #
Pushes Haskell function as a callable userdata. All values created
will be garbage collected. The function should behave similar to a
CFunction
.
Error conditions should be indicated by raising a catchable exception
or by returning the result of
.error
Example:
mod23 :: Lua NumResults mod23 = do mn <- tointeger (nthBottom 1) case mn of Nothing -> pushstring "expected an integer" *> error Just n -> pushinteger (n `mod` 23) pushHaskellFunction mod23 setglobal "mod23"