astver = 2.0
ast = {
    block_00000 = {
        {"bg", file="black", path=":bg/"},
        {"user", mode="manual"},
        {"selback", file="b999"},
        {"msg", no=1},
        {"excall", file="b999"},
        {"text"},
        line = 15,
    },
    label = {
        top = { block="block_00000", label=1 },
    },
}

// gcc -o example example.c -llua -lm -ldl && ./example

#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>

static void inspect_table(lua_State *L,int lev) {
    const char *k, *v, *t; int i;
    luaL_checktype(L,-1,LUA_TTABLE);
    lua_pushnil(L);
    while(lua_next(L,-2)) {
        k=luaL_tolstring(L,-2,0);
        v=luaL_tolstring(L,-2,0);
        for(i=0;i<lev;i++) printf("  ");
        if (lua_istable(L,-3)) {
            printf("[%s]={\n",k);
            lua_pop(L,2);
            lua_pushvalue(L,-1);
            inspect_table(L,lev+1);
            lua_pop(L,1);
            for(i=0;i<lev;i++) printf("  "); printf("}\n");
        } else {
            t=luaL_typename(L,-3);
            printf("[%s]='%s':%s\n",k,v,t);
            lua_pop(L,3);
        }
    }
    lua_pop(L,1);
}

int main(int argc, char const *argv[]) {
    lua_State *L;

    L=luaL_newstate();
    luaL_openlibs(L);
    luaL_dofile(L,"load_data.lua");

    lua_getglobal(L,"data");
    inspect_table(L,0);

    lua_close(L);
    return 0;
}

local function load_data(name)
    local res,fn,err={},loadfile(name)
    if err then error(err,2) end
    setmetatable(_G,{__newindex=function(t,n,v) res[n]=v end})
    local ok,err=pcall(fn)
    setmetatable(_G,nil)
    if err then error(err) end
    return res
end

data=load_data "data.lua"

astver = 2.0
ast = {
    block_00000 = {
        {"bg", file="black", path=":bg/"},
        {"user", mode="manual"},
        {"selback", file="b999"},
        {"msg", no=1},
        {"excall", file="b999"},
        {"text"},
        line = 15,
    },
    label = {
        top = { block="block_00000", label=1 },
    },
}

[astver]='2.0':number
[ast]={
  [block_00000]={
    [1]={
      [1]='bg':string
      [file]='black':string
      [path]=':bg/':string
    }
    [2]={
      [1]='user':string
      [mode]='manual':string
    }
    [3]={
      [1]='selback':string
      [file]='b999':string
    }
    [4]={
      [1]='msg':string
      [no]='1':number
    }
    [5]={
      [1]='excall':string
      [file]='b999':string
    }
    [6]={
      [1]='text':string
    }
    [line]='15':number
  }
  [label]={
    [top]={
      [label]='1':number
      [block]='block_00000':string
    }
  }
}