Function db_getinfo

depends/lua/src/ldblib.c:145–190

** Calls 'lua_getinfo' and collects all results in a new table. ** L1 needs stack space for an optional input (function) plus ** two optional outputs (function and line table) from function ** 'lua_getinfo'. */

** 'lua_getinfo'.
*/
static int db_getinfo (lua_State *L) {
  lua_Debug ar;
  int arg;
  lua_State *L1 = getthread(L, &arg);
  const char *options = luaL_optstring(L, arg+2, "flnStu");
  checkstack(L, L1, 3);
  if (lua_isfunction(L, arg + 1)) {  /* info about a function? */
    options = lua_pushfstring(L, ">%s", options);  /* add '>' to 'options' */
    lua_pushvalue(L, arg + 1);  /* move function to 'L1' stack */
    lua_xmove(L, L1, 1);
  }
  else {  /* stack level */
    if (!lua_getstack(L1, (int)luaL_checkinteger(L, arg + 1), &ar)) {
      lua_pushnil(L);  /* level out of range */
      return 1;
    }
  }
  if (!lua_getinfo(L1, options, &ar))
    return luaL_argerror(L, arg+2, "invalid option");
  lua_newtable(L);  /* table to collect results */
  if (strchr(options, 'S')) {
    settabss(L, "source", ar.source);
    settabss(L, "short_src", ar.short_src);
    settabsi(L, "linedefined", ar.linedefined);
    settabsi(L, "lastlinedefined", ar.lastlinedefined);
    settabss(L, "what", ar.what);
  }
  if (strchr(options, 'l'))
    settabsi(L, "currentline", ar.currentline);
  if (strchr(options, 'u')) {
    settabsi(L, "nups", ar.nups);
    settabsi(L, "nparams", ar.nparams);
    settabsb(L, "isvararg", ar.isvararg);
  }
  if (strchr(options, 'n')) {
    settabss(L, "name", ar.name);
    settabss(L, "namewhat", ar.namewhat);
  }
  if (strchr(options, 't'))
    settabsb(L, "istailcall", ar.istailcall);
  if (strchr(options, 'L'))
    treatstackoption(L, L1, "activelines");
  if (strchr(options, 'f'))
    treatstackoption(L, L1, "func");
  return 1;  /* return table */
}


static int db_getlocal (lua_State *L) {