Copyright	© 2007–2012 Gracjan Polak; © 2012–2016 Ömer Sinan Ağacan; © 2017-2022 Albert Krewinkel
License	MIT
Maintainer	Albert Krewinkel <tarleb+hslua@zeitkraut.de>
Stability	beta
Safe Haskell	None
Language	Haskell2010

Lua.Ersatz

Contents

Get functions (Lua -> stack)
Set functions (stack -> Lua)
Misc
Auxiliary Library

Description

Ersatz functions for Lua API items which may, directly or indirectly, throw a Lua error.

Synopsis

hslua_gettable :: State -> StackIndex -> Ptr StatusCode -> IO TypeCode
hslua_getglobal :: State -> CString -> CSize -> Ptr StatusCode -> IO TypeCode
hslua_settable :: State -> StackIndex -> Ptr StatusCode -> IO ()
hslua_setglobal :: State -> CString -> CSize -> Ptr StatusCode -> IO ()
hslua_error :: State -> IO NumResults
hslua_next :: State -> StackIndex -> Ptr StatusCode -> IO LuaBool
hslua_concat :: State -> NumArgs -> Ptr StatusCode -> IO ()
hslua_compare :: State -> StackIndex -> StackIndex -> OPCode -> Ptr StatusCode -> IO LuaBool
hsluaL_newstate :: IO State
hsluaL_tolstring :: State -> StackIndex -> Ptr CSize -> IO (Ptr CChar)

Get functions (Lua -> stack)

hslua_gettable :: State -> StackIndex -> Ptr StatusCode -> IO TypeCode Source #

Behaves like lua_gettable, but prevents unrecoverable program crashes by calling that function through lua_pcall. Takes an additional status code pointer that is set to the status returned by lua_pcall.

hslua_getglobal :: State -> CString -> CSize -> Ptr StatusCode -> IO TypeCode Source #

Behaves like lua_getglobal, but prevents unrecoverable program crashes by calling that function through lua_pcall. Takes an additional status code pointer that is set to the status returned by lua_pcall.

Set functions (stack -> Lua)

hslua_settable :: State -> StackIndex -> Ptr StatusCode -> IO () Source #

Behaves like lua_settable, but prevents unrecoverable program crashes by calling that function through lua_pcall. Takes an additional status code pointer that is set to the status returned by lua_pcall.

hslua_setglobal :: State -> CString -> CSize -> Ptr StatusCode -> IO () Source #

Behaves like lua_setglobal, but prevents unrecoverable program crashes by calling that function through lua_pcall. Takes an additional status code pointer that is set to the status returned by lua_pcall.

Misc

hslua_error :: State -> IO NumResults Source #

Replacement for lua_error; it uses the HsLua error signaling convention instead of raw Lua errors.

hslua_next :: State -> StackIndex -> Ptr StatusCode -> IO LuaBool Source #

Wrapper around lua_next which catches any Lua errors.

hslua_concat :: State -> NumArgs -> Ptr StatusCode -> IO () Source #

Wrapper around lua_concat which catches any Lua errors.

hslua_compare Source #

Arguments

:: State
-> StackIndex	index 1
-> StackIndex	index 2
-> OPCode	operator
-> Ptr StatusCode	status
-> IO LuaBool

Compares two Lua values. Returns 1 if the value at index index1 satisfies op when compared with the value at index index2, following the semantics of the corresponding Lua operator (that is, it may call metamethods). Otherwise returns 0. Also returns 0 if any of the indices is not valid.

The value of op must be one of the following constants:

LUA_OPEQ: compares for equality (==)
LUA_OPLT: compares for less than (<)
LUA_OPLE: compares for less or equal (<=)

This function wraps lua_compare and takes an additional parameter status; if it is not NULL, then the return value is set to the status after calling lua_compare.

Auxiliary Library

hsluaL_newstate :: IO State Source #

Creates a new Lua state and set extra registry values for error bookkeeping.

hsluaL_tolstring :: State -> StackIndex -> Ptr CSize -> IO (Ptr CChar) Source #

Converts object to string, respecting any metamethods; returns NULL if an error occurs.