HsLua.Classes

A value that can be read from the Lua stack.

Try to convert the value at the given stack index to a Haskell value. Returns Left with the error on failure.

A value that can be pushed to the Lua stack.

Push list as numerically indexed table.

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.

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

• all arguments are instances of Peekable

• return type is LuaE e a, where a is an instance of Pushable

Any exception of type e will be caught.

Important: this does not catch exceptions other than e; exception handling must be done by the 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)))

Invoke a Lua function. Use as:

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

Imports a Haskell function and registers it at global name.

Raise a Lua error, using the given value as the error object.

Newtype wrapper intended to be used for optional Lua values. Nesting this type is strongly discouraged as missing values on inner levels are indistinguishable from missing values on an outer level; wrong values would be the likely result.