hslua
Bindings to Lua, an embeddable scripting language
| LTS Haskell 22.41: | 2.3.1 |
| Stackage Nightly 2024-11-12: | 2.3.1 |
| Latest on Hackage: | 2.3.1 |
hslua-2.3.1@sha256:b3b5b4111f3b4d6eafd9622087876027650b28d28f7e26a62ac9bc4ec04068b3,4877Module documentation for 2.3.1
HsLua – Bindings to Lua, an embeddable scripting language
HsLua provides bindings, wrappers, types, and helper functions to bridge Haskell and Lua.
This package is part of HsLua, a Haskell framework built around the embeddable scripting language Lua.
Overview
Lua is a small, well-designed, embeddable scripting language. It has become the de-facto default to make programs extensible and is widely used everywhere from servers over games and desktop applications up to security software and embedded devices. This package provides Haskell bindings to Lua, enable coders to embed the language into their programs, making them scriptable.
HsLua ships with batteries included and includes Lua 5.4.4. Cabal flags make it easy to compile against a system-wide Lua installation.
Interacting with Lua
HsLua provides the Lua type to define Lua operations. The operations are
executed by calling run. A simple “Hello, World” program, using the Lua
print function, is given below:
import Foreign.Lua as Lua
main :: IO ()
main = Lua.run prog
where
prog :: Lua ()
prog = do
Lua.openlibs -- load Lua libraries so we can use 'print'
Lua.callFunc "print" "Hello, World!"
The Lua stack
Lua’s API is stack-centered: most operations involve pushing values to the stack
or receiving items from the stack. E.g., calling a function is performed by
pushing the function onto the stack, followed by the function arguments in the
order they should be passed to the function. The API function call then
invokes the function with given numbers of arguments, pops the function and
parameters off the stack, and pushes the results.
,----------.
| arg 3 |
+----------+
| arg 2 |
+----------+
| arg 1 |
+----------+ ,----------.
| function | call 3 1 | result 1 |
+----------+ ===========> +----------+
| | | |
| stack | | stack |
| | | |
Manually pushing and pulling arguments can become tiresome, so HsLua makes
function calling simple by providing callFunc. It uses type-magic to allow
different numbers of arguments. Think about it as having the signature
callFunc :: String -> a1 -> a2 -> … -> res
where the arguments a1, a2, … must be of a type which can be pushed to the Lua
stack, and the result-type res must be constructable from a value on the Lua
stack.
Getting values from and to the Lua stack
Conversion between Haskell and Lua values is governed by two type classes:
-- | A value that can be read from the Lua stack.
class Peekable a where
-- | Check if at index @n@ there is a convertible Lua value and
-- if so return it. Throws a @'LuaException'@ otherwise.
peek :: StackIndex -> Lua a
and
-- | A value that can be pushed to the Lua stack.
class Pushable a where
-- | Pushes a value onto Lua stack, casting it into meaningfully
-- nearest Lua type.
push :: a -> Lua ()
Many basic data types (except for numeric types, see the FAQ) have instances for
these type classes. New instances can be defined for custom types using the
functions in Foreign.Lua.Core (also exported in Foreign.Lua).
Q&A
-
Can I see some examples? Basic examples are available in the hslua-examples repository.
A big project build with hslua is Pandoc, the universal document converter. It is written in Haskell and includes a Lua interpreter, enabling programmatic modifications of documents via Lua. Furthermore, custom output formats can be defined via Lua scripts.
-
Where are the coroutine related functions? Yielding from a coroutine works via
longjmp, which plays very badly with Haskell’s RTS. Tests to get coroutines working with HsLua were unsuccessful. No coroutine related functions are exported from the default module for that reason. Pull requests intended to fix this are very welcome.