lua_dump[-0, +0, –] int lua_dump (lua_State *L, lua_Writer writer, void *data, int strip); Dumps a function as a binary chunk. Receives a Lua function on the top of the stack and produces a binary chunk that, if loaded again, results in a function equivalent to the one dumped. As it produces parts of the chunk, lua_dump calls function writer (see lua_Writer) with the given data to write them. If strip is true, the bina

lua_arith[-(2|1), +1, e] void lua_arith (lua_State *L, int op); Performs an arithmetic or bitwise operation over the two values (or one, in the case of negations) at the top of the stack, with the value at the top being the second operand, pops these values, and pushes the result of the operation. The function follows the semantics of the corresponding Lua operator (that is, it may call metamethods). The value of op must be one of the following constants: LUA_OPADD: performs addition (+

lua_Reader typedef const char * (*lua_Reader) (lua_State *L, void *data, size_t *size); The reader function used by lua_load. Every time it needs another piece of the chunk, lua_load calls the reader, passing along its data parameter. The reader must return a pointer to a block of memory with a new piece of the chunk and set size to the block size. The block must exist until the reader function is called again. To signal

luaL_setfuncs[-nup, +0, m] void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup); Registers all functions in the array l (see luaL_Reg) into the table on the top of the stack (below optional upvalues, see next). When nup is not zero, all functions are created sharing nup upvalues, which must be previously pushed on the stack on top of the library table. These values are popped from the stack after the registration.

lua_gethook[-0, +0, –] lua_Hook lua_gethook (lua_State *L); Returns the current hook function.

luaL_optlstring[-0, +0, v] const char *luaL_optlstring (lua_State *L, int arg, const char *d, size_t *l); If the function argument arg is a string, returns this string. If this argument is absent or is nil, returns d. Otherwise, raises an error. If l is not NULL, fills the position *l with the result's length. If the result is NULL (only possible when returning d and d == NULL), its length is considered

lua_Hook typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar); Type for debugging hook functions. Whenever a hook is called, its ar argument has its field event set to the specific event that triggered the hook. Lua identifies these events with the following constants: LUA_HOOKCALL, LUA_HOOKRET, LUA_HOOKTAILCALL, LUA_HOOKLINE, and LUA_HOOKCOUNT. Moreover, for line events, the field currentline is also set. To get the value of any other field in ar, the hook must call lua_getinfo. For ca

lua_sethook[-0, +0, –] void lua_sethook (lua_State *L, lua_Hook f, int mask, int count); Sets the debugging hook function. Argument f is the hook function. mask specifies on which events the hook will be called: it is formed by a bitwise OR of the constants LUA_MASKCALL, LUA_MASKRET, LUA_MASKLINE, and LUA_MASKCOUNT. The count argument is only meaningful when the mask includes LUA_MASKCOUNT. For each event, the hook is called as explained below: The call hook: is called when the interpre

3.4.7 – The Length Operator The length operator is denoted by the unary prefix operator #. The length of a string is its number of bytes (that is, the usual meaning of string length when each character is one byte). The length operator applied on a table returns a border in that table. A border in a table t is any natural number that satisfies the following condition: (border == 0 or t[border] ~= nil) and t[border + 1] == nil In words, a border is any (natural) index in a table where a n

lua_pcall[-(nargs + 1), +(nresults|1), –] int lua_pcall (lua_State *L, int nargs, int nresults, int msgh); Calls a function in protected mode. Both nargs and nresults have the same meaning as in lua_call. If there are no errors during the call, lua_pcall behaves exactly like lua_call. However, if there is any error, lua_pcall catches it, pushes a single value on the stack (the error object), and returns an error code. Like lua_call, lua_pcall always removes the function and its arguments f