main.rs

extern crate hlua;

const LUA: &'static str = r#"
    data:extend({
        {
            type = "font",
            name = "default",
            from = "default",
            size = 14
        }
    })
"#;

type LuaTable<'a, 'b> = hlua::LuaTable<hlua::PushGuard<&'a mut hlua::Lua<'b>>>;

#[derive(Debug)]
enum Data {
}

impl Data {
    pub fn from_table(table: &mut LuaTable) {
        for (key, value) in table.iter().filter_map(|e|e) {
            let key: String = key;
            let value: hlua::AnyLuaValue = value;
            match value {
                hlua::AnyLuaValue::LuaOther => println!("{:?} is of type \"other\"", key),
                hlua::AnyLuaValue::LuaNumber(val) => println!("{:?} = {}", key, val),
                _ => unreachable!("{:?}", value)
            }
        }
    }
}

fn main(){
    let mut lua = hlua::Lua::new();
    lua.openlibs();

    let str = String::from(r#"
data = {}
data["__length"] = 0;
function data:extend(table)
    for _, value in ipairs(table) do
        self[self["__length"]] = value
        self["__length"] = self["__length"] + 1
    end
end
"#) + LUA;

    lua.execute::<()>(&str).unwrap();
    let value: hlua::AnyLuaValue = lua.get("data").unwrap();
    let value = match value {
        hlua::AnyLuaValue::LuaOther => Data::from_table(&mut lua.get::<LuaTable, &'static str>("data").unwrap()),
        _ => unreachable!("{:?}", value)
    };
    println!("{:#?}", value);
}

output

    Finished dev [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target\debug\marapr.exe`
"__length" = 1
"0" is of type "other"
thread 'main' panicked at 'PANIC: unprotected error in call to Lua API (invalid key to 'next')
', C:\Users\vkoenders.INTRANET\.cargo\registry\src\github.com-1ecc6299db9ec823\hlua-0.3.1\src\lib.rs:300
stack backtrace:
   0:     0x7ff605f0a18f - std::sys_common::backtrace::_print
                               at C:\projects\rust\src\libstd\sys_common\backtrace.rs:94
   1:     0x7ff605f112cc - std::panicking::default_hook::{{closure}}
                               at C:\projects\rust\src\libstd\panicking.rs:354
   2:     0x7ff605f10b8f - std::panicking::default_hook
                               at C:\projects\rust\src\libstd\panicking.rs:371
   3:     0x7ff605f11711 - std::panicking::rust_panic_with_hook
                               at C:\projects\rust\src\libstd\panicking.rs:549
   4:     0x7ff605f115c8 - std::panicking::begin_panic<collections::string::String>
                               at C:\projects\rust\src\libstd\panicking.rs:511
   5:     0x7ff605f114e4 - std::panicking::begin_panic_fmt
                               at C:\projects\rust\src\libstd\panicking.rs:495
   6:     0x7ff605f00fcd - hlua::{{impl}}::new::panic
                               at C:\Users\vkoenders.INTRANET\.cargo\registry\src\github.com-1ecc6299db9ec823\hlua-0.3.1\src\lib.rs:300
   7:     0x7ff605f24dfb - luaD_throw
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\ldo.c:117
   8:     0x7ff605f229a2 - luaG_errormsg
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\ldebug.c:599
   9:     0x7ff605f22875 - luaG_runerror
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\ldebug.c:608
  10:     0x7ff605f2b245 - findindex
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\ltable.c:163
  11:     0x7ff605f2aa49 - luaH_next
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\ltable.c:170
  12:     0x7ff605f1f774 - lua_next
                               at c:\users\vkoenders.intranet\.cargo\registry\src\github.com-1ecc6299db9ec823\lua52-sys-0.1.0\lua\src\lapi.c:1120
  13:     0x7ff605ef17e2 - hlua::lua_tables::{{impl}}::next<hlua::PushGuard<&mut hlua::Lua>,collections::string::String,hlua::any::AnyLuaValue>
                               at C:\Users\vkoenders.INTRANET\.cargo\registry\src\github.com-1ecc6299db9ec823\hlua-0.3.1\src\lua_tables.rs:434
  14:     0x7ff605efb450 - core::iter::iterator::{{impl}}::next<hlua::lua_tables::LuaTableIterator<hlua::PushGuard<&mut hlua::Lua>, collections::string::String, hlua::any::AnyLuaValue>>
                               at C:\projects\rust\src\libcore\iter\iterator.rs:2197
  15:     0x7ff605efcd0b - core::iter::{{impl}}::next<(collections::string::String, hlua::any::AnyLuaValue),hlua::lua_tables::LuaTableIterator<hlua::PushGuard<&mut hlua::Lua>, collections::string::String, hlua::any::AnyLuaValue>,closure>
                               at C:\projects\rust\src\libcore\iter\mod.rs:1175
  16:     0x7ff605efd066 - marapr::Data::from_table
                               at d:\Development\Personal\marapr\src\main.rs:22
  17:     0x7ff605efd77c - marapr::main
                               at d:\Development\Personal\marapr\src\main.rs:52
  18:     0x7ff605f121d1 - panic_unwind::__rust_maybe_catch_panic
                               at C:\projects\rust\src\libpanic_unwind\lib.rs:98
  19:     0x7ff605f119ea - std::rt::lang_start
                               at C:\projects\rust\src\libstd\rt.rs:51
  20:     0x7ff605efda0b - main
  21:     0x7ff605f4b758 - __scrt_common_main_seh
                               at f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253
  22:     0x7ff97c518363 - BaseThreadInitThunk
error: process didn't exit successfully: `target\debug\marapr.exe` (exit code: 101)