Re: Bytecode hacks

[Luiz Henrique de Figueiredo <lhf@...>]

> I think there are patchs around for the t:[var]() syntax.

Actually, this one seems simple. A quick hack is to just change
suffixedexp in lparser.c (from Lua 5.2.3):

       case ':': {  /* `:' NAME funcargs */
         expdesc key;
         luaX_next(ls);
-        checkname(ls, &key);
+        if (ls->t.token=='[') {
+           luaK_exp2anyregup(fs, v);
+           yindex(ls, &key);
+        }
+        else
+           checkname(ls, &key);
         luaK_self(fs, v, &key);
         funcargs(ls, v, line);
         break;

I tested it only on this program. It works in some cases but not in others :-(

      local t={}
      t.f=print
      t.ff=print
      local v="f"
      t:f(1)
      t:[v](2)
      t:[string.char(string.byte("f"))](3,32,33)
      t:["f".."f"](4)
      t:["f"..string.sub("afun",2,2)](5,52,53)
      t:[(string.sub("afun",2,2))](6,62,63)

      table: 0x107e04e40	1
      table: 0x107e04e40	2
      3	32	33
      table: 0x107e04e40	4
      table: 0x107e04e40	5	52	53
      6	62	63

It's been some time since I last hacked the parser and I must have
overlooked something. Happy hacking.