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use std::sync::Arc;
use {ExternalError, Function, Lua, MetaMethod, String, UserData, UserDataMethods};
#[test]
fn test_user_data() {
struct UserData1(i64);
struct UserData2(Box<i64>);
impl UserData for UserData1 {};
impl UserData for UserData2 {};
let lua = Lua::new();
let userdata1 = lua.create_userdata(UserData1(1)).unwrap();
let userdata2 = lua.create_userdata(UserData2(Box::new(2))).unwrap();
assert!(userdata1.is::<UserData1>().unwrap());
assert!(!userdata1.is::<UserData2>().unwrap());
assert!(userdata2.is::<UserData2>().unwrap());
assert!(!userdata2.is::<UserData1>().unwrap());
assert_eq!(userdata1.borrow::<UserData1>().unwrap().0, 1);
assert_eq!(*userdata2.borrow::<UserData2>().unwrap().0, 2);
}
#[test]
fn test_methods() {
struct MyUserData(i64);
impl UserData for MyUserData {
fn add_methods(methods: &mut UserDataMethods<Self>) {
methods.add_method("get_value", |_, data, ()| Ok(data.0));
methods.add_method_mut("set_value", |_, data, args| {
data.0 = args;
Ok(())
});
}
}
let lua = Lua::new();
let globals = lua.globals();
let userdata = lua.create_userdata(MyUserData(42)).unwrap();
globals.set("userdata", userdata.clone()).unwrap();
lua.exec::<()>(
r#"
function get_it()
return userdata:get_value()
end
function set_it(i)
return userdata:set_value(i)
end
"#,
None,
).unwrap();
let get = globals.get::<_, Function>("get_it").unwrap();
let set = globals.get::<_, Function>("set_it").unwrap();
assert_eq!(get.call::<_, i64>(()).unwrap(), 42);
userdata.borrow_mut::<MyUserData>().unwrap().0 = 64;
assert_eq!(get.call::<_, i64>(()).unwrap(), 64);
set.call::<_, ()>(100).unwrap();
assert_eq!(get.call::<_, i64>(()).unwrap(), 100);
}
#[test]
fn test_metamethods() {
#[derive(Copy, Clone)]
struct MyUserData(i64);
impl UserData for MyUserData {
fn add_methods(methods: &mut UserDataMethods<Self>) {
methods.add_method("get", |_, data, ()| Ok(data.0));
methods.add_meta_function(
MetaMethod::Add,
|_, (lhs, rhs): (MyUserData, MyUserData)| Ok(MyUserData(lhs.0 + rhs.0)),
);
methods.add_meta_function(
MetaMethod::Sub,
|_, (lhs, rhs): (MyUserData, MyUserData)| Ok(MyUserData(lhs.0 - rhs.0)),
);
methods.add_meta_method(MetaMethod::Index, |_, data, index: String| {
if index.to_str()? == "inner" {
Ok(data.0)
} else {
Err(format_err!("no such custom index").to_lua_err())
}
});
}
}
let lua = Lua::new();
let globals = lua.globals();
globals.set("userdata1", MyUserData(7)).unwrap();
globals.set("userdata2", MyUserData(3)).unwrap();
assert_eq!(
lua.eval::<MyUserData>("userdata1 + userdata2", None)
.unwrap()
.0,
10
);
assert_eq!(
lua.eval::<MyUserData>("userdata1 - userdata2", None)
.unwrap()
.0,
4
);
assert_eq!(lua.eval::<i64>("userdata1:get()", None).unwrap(), 7);
assert_eq!(lua.eval::<i64>("userdata2.inner", None).unwrap(), 3);
assert!(lua.eval::<()>("userdata2.nonexist_field", None).is_err());
}
#[test]
fn test_gc_userdata() {
struct MyUserdata {
id: u8,
}
impl UserData for MyUserdata {
fn add_methods(methods: &mut UserDataMethods<Self>) {
methods.add_method("access", |_, this, ()| {
assert!(this.id == 123);
Ok(())
});
}
}
let lua = Lua::new();
{
let globals = lua.globals();
globals.set("userdata", MyUserdata { id: 123 }).unwrap();
}
assert!(lua.eval::<()>(
r#"
local tbl = setmetatable({
userdata = userdata
}, { __gc = function(self)
-- resurrect userdata
hatch = self.userdata
end })
tbl = nil
userdata = nil -- make table and userdata collectable
collectgarbage("collect")
hatch:access()
"#,
None
).is_err());
}
#[test]
fn detroys_userdata() {
struct MyUserdata(Arc<()>);
impl UserData for MyUserdata {}
let rc = Arc::new(());
let lua = Lua::new();
{
let globals = lua.globals();
globals.set("userdata", MyUserdata(rc.clone())).unwrap();
}
assert_eq!(Arc::strong_count(&rc), 2);
drop(lua); // should destroy all objects
assert_eq!(Arc::strong_count(&rc), 1);
}
#[test]
fn user_value() {
let lua = Lua::new();
struct MyUserData;
impl UserData for MyUserData {}
let ud = lua.create_userdata(MyUserData).unwrap();
ud.set_user_value("hello").unwrap();
assert_eq!(ud.get_user_value::<String>().unwrap(), "hello");
}
|
