Re: writing this Lua Code in C ( newbie )

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

For Thierry's convenience, here's the code, using Lua 4.0:

/* 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,"getVar");
 lua_pushliteral(L,"X");
 lua_call(L,1,1);
 lua_setglobal(L,"x");
 lua_newtable(L);
 lua_setglobal(L,"T");
 lua_newtable(L);
 lua_pushliteral(L,"__index");
 lua_pushcclosure(L,F1,0);
 lua_pushliteral(L,"__newindex");
 lua_pushcclosure(L,F2,0);
 lua_settable(L,-5);
 lua_settable(L,-3);
 lua_getglobal(L,"setmetatable");
 lua_getglobal(L,"T");
 lua_pushvalue(L,1);
 lua_call(L,2,0);
 lua_getglobal(L,"T");
 lua_pushliteral(L,"x");
 lua_gettable(L,-2);
 lua_remove(L,-2);
 lua_setglobal(L,"x");
 return 0;
}

static int F1(lua_State *L)
{
 lua_getglobal(L,"getVar");
 lua_pushvalue(L,2);
 lua_call(L,1,LUA_MULTRET);
 return lua_gettop(L);
 return 0;
}

static int F2(lua_State *L)
{
 lua_getglobal(L,"error");
 lua_pushliteral(L,"T is read-only");
 lua_pushnumber(L,2);
 lua_call(L,2,0);
 return 0;
}

/* function proptotypes */
static int F1(lua_State *L);
static int F2(lua_State *L);


On Tue, Jul 20, 2010 at 1:24 PM, Luiz Henrique de Figueiredo
<lhf@tecgraf.puc-rio.br> wrote:
>> 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:
>
> Better compile the Lua code with Lua 4 then before running lua2c.
>