Re: C API to check if string is valid varible name

[Tomas Mudrunka <mudrunka@...>]

Dne 2023-03-24 14:29, Roberto Ierusalimschy napsal:
> > > For instance?
> >
> > I have lua embedded in system where users can define table of 
> > variables and
> > then write expressions to process them. However i think it would be
> > reasonable to have some sanity checks in place, so i don't have to 
> > explain
> > why formulas using variable called "TIME-MAX" are not working :-) and 
> > stuff
> > like that...
>
> Up to reserved words, the Lua pattern "^[%a_][%w_]*$" should do the 
> job.
>
> -- Roberto

So just to give happy end to this thread, thanks for your sugestion.
I've ended using this C code, probably will simplify it later:

int lua_string_match(lua_State *LUA, const char *string, const char 
*pattern) {
  int ret;
  lua_getglobal(LUA, "string");
  lua_getfield(LUA, -1, "match");
  lua_pushstring(LUA, string);
  lua_pushstring(LUA, pattern);
  lua_call(LUA, 2, 1); //2args, 1ret
  ret = lua_toboolean(LUA, -1);
  lua_pop(LUA, lua_gettop(LUA));
  return ret;
}

int lua_check_variable_name(lua_State *LUA, const char *string) {
  return lua_string_match(LUA, string, "^[%a_][%w_]*$"); //TODO: Prepsat 
do lua souboru???
}


--
S pozdravem
Best regards
     Tomáš Mudruňka - SPOJE.NET s.r.o.