Re: writing this Lua Code in C ( newbie )

[Valerio Schiavoni <valerio.schiavoni@...>]

The following is generated by lua2c
(http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/#lua2c) .
 It expects Lua 4.0 bytecode, so it's not working code, but you might
use it as basis perhaps:

/* This C code was generated by lua2c from the Lua code below.


x  = getVar( "X" )
T = {}
local mT = {
   __index = function( t, k)
   return getVar( k )
end,
   __newindex = function(t,k,v)
   error("T is read-only", 2)
end
}
setmetatable( T, mT)

x = T[ "x"]
*/
static int MAIN(lua_State *L)
{
 lua_getglobal(L,"-2	; getVar");
#error cannot handle LOADK 1  -3	; "X
 lua_call(L,0,2);
 lua_setglobal(L,"-1	; x");
#error cannot handle NEWTABLE 0 0 0
 lua_setglobal(L,"-4	; T");
#error cannot handle NEWTABLE 0 0 2
 lua_pushcclosure(L,F1,0);
 lua_settable(L,-2);
 lua_remove(L,-2);
 lua_pushcclosure(L,F2,1);
 lua_settable(L,-2);
 lua_remove(L,-2);
 lua_getglobal(L,"-7	; setmetatable");
 lua_getglobal(L,"-4	; T");
#error cannot handle MOVE 3 0
 lua_call(L,-1,3);
 lua_getglobal(L,"-4	; T");
 lua_gettable(L,-2);
 lua_remove(L,-2);
 lua_setglobal(L,"-1	; x");
 return 3;
static int F1(lua_State *L)
{
 lua_getglobal(L,"-1	; getVar");
#error cannot handle MOVE 3 1
 lua_call(L,0,LUA_MULTRET);
 return lua_gettop(L);
 return -2;
 return 2;
static int F2(lua_State *L)
{
 lua_getglobal(L,"-1	; error");
#error cannot handle LOADK 4  -2	; "T is read-only
#error cannot handle LOADK 5  -3	; 2
 lua_call(L,0,3);
 return 6;
/* function proptotypes */
static int F1(lua_State *L);
static int F2(lua_State *L);
}


On Tue, Jul 20, 2010 at 12:33 PM, Thierry <th.douez@gmail.com> wrote:
> Hello All,
>
> Having start learning Lua for few days, I'm stuck ( or let say don't know
> how to start ) with this problem :
>
> Here is what is working the way I want ( all in Lua ) :
>
> --first :
>
> x  = getVar( "X" )
>
> --getVar() is a C function I made which read
> -- some prefs data in my business environment.
>
> --then :
>
> T = {}
> local mT = {
>    __index = function( t, k)
>    return getVar( k )
> end,
>    __newindex = function(t,k,v)
>    error("T is read-only", 2)
> end
> }
> setmetatable( T, mT)
>
> x = T[ "x"]
> ------------------------
>
> What I would like to do is to write these few lines in C.
> The table T should be a global var ( no library, modules )
>
> Any pointers, link or pseudo-code to start would be very much appreciated
>
> Regards,
> Thierry
>
>
>