use mlua::{Function, Lua, Result, String, Table};
#[test]
fn test_function() -> Result<()> {
let lua = Lua::new();
let globals = lua.globals();
lua.load(
r#"
function concat(arg1, arg2)
return arg1 .. arg2
end
"#,
)
.exec()?;
let concat = globals.get::<_, Function>("concat")?;
assert_eq!(concat.call::<_, String>(("foo", "bar"))?, "foobar");
Ok(())
}
#[test]
fn test_bind() -> Result<()> {
let lua = Lua::new();
let globals = lua.globals();
lua.load(
r#"
function concat(...)
local res = ""
for _, s in pairs({...}) do
res = res..s
end
return res
end
"#,
)
.exec()?;
let mut concat = globals.get::<_, Function>("concat")?;
concat = concat.bind("foo")?;
concat = concat.bind("bar")?;
concat = concat.bind(("baz", "baf"))?;
assert_eq!(concat.call::<_, String>(())?, "foobarbazbaf");
assert_eq!(
concat.call::<_, String>(("hi", "wut"))?,
"foobarbazbafhiwut"
);
let mut concat2 = globals.get::<_, Function>("concat")?;
concat2 = concat2.bind(())?;
assert_eq!(concat2.call::<_, String>(())?, "");
assert_eq!(concat2.call::<_, String>(("ab", "cd"))?, "abcd");
Ok(())
}
#[test]
fn test_rust_function() -> Result<()> {
let lua = Lua::new();
let globals = lua.globals();
lua.load(
r#"
function lua_function()
return rust_function()
end
-- Test to make sure chunk return is ignored
return 1
"#,
)
.exec()?;
let lua_function = globals.get::<_, Function>("lua_function")?;
let rust_function = lua.create_function(|_, ()| Ok("hello"))?;
globals.set("rust_function", rust_function)?;
assert_eq!(lua_function.call::<_, String>(())?, "hello");
Ok(())
}
#[test]
fn test_c_function() -> Result<()> {
let lua = Lua::new();
unsafe extern "C-unwind" fn c_function(state: *mut mlua::lua_State) -> std::os::raw::c_int {
let lua = Lua::init_from_ptr(state);
lua.globals().set("c_function", true).unwrap();
0
}
let func = unsafe { lua.create_c_function(c_function)? };
func.call(())?;
assert_eq!(lua.globals().get::<_, bool>("c_function")?, true);
Ok(())
}
#[cfg(not(feature = "luau"))]
#[test]
fn test_dump() -> Result<()> {
let lua = unsafe { Lua::unsafe_new() };
let concat_lua = lua
.load(r#"function(arg1, arg2) return arg1 .. arg2 end"#)
.eval::<Function>()?;
let concat = lua.load(&concat_lua.dump(false)).into_function()?;
assert_eq!(concat.call::<_, String>(("foo", "bar"))?, "foobar");
Ok(())
}
#[test]
fn test_function_environment() -> Result<()> {
let lua = Lua::new();
let rust_func = lua.create_function(|_, ()| Ok("hello"))?;
assert_eq!(rust_func.environment(), None);
assert_eq!(rust_func.set_environment(lua.globals()).ok(), Some(false));
lua.globals().set("hello", "global")?;
let lua_func = lua
.load(
r#"
local t = ""
return function()
-- two upvalues
return t .. hello
end
"#,
)
.eval::<Function>()?;
let lua_func2 = lua.load("return hello").into_function()?;
assert_eq!(lua_func.call::<_, String>(())?, "global");
assert_eq!(lua_func.environment(), Some(lua.globals()));
let env = lua.create_table_from([("hello", "local")])?;
assert!(lua_func.set_environment(env.clone())?);
assert_eq!(lua_func.call::<_, String>(())?, "local");
assert_eq!(lua_func2.call::<_, String>(())?, "global");
lua.load(
r#"
local number = 15
function lucky() return tostring("number is "..number) end
new_env = {
tostring = function() return tostring(number) end,
}
"#,
)
.exec()?;
let lucky = lua.globals().get::<_, Function>("lucky")?;
assert_eq!(lucky.call::<_, String>(())?, "number is 15");
let new_env = lua.globals().get::<_, Table>("new_env")?;
lucky.set_environment(new_env)?;
assert_eq!(lucky.call::<_, String>(())?, "15");
let lua_func2 = lua
.load(r#"return function() return (function() return hello end)() end"#)
.eval::<Function>()?;
assert!(lua_func2.set_environment(env.clone())?);
lua.gc_collect()?;
assert_eq!(lua_func2.call::<_, String>(())?, "local");
Ok(())
}
#[test]
fn test_function_info() -> Result<()> {
let lua = Lua::new();
let globals = lua.globals();
lua.load(
r#"
function function1()
return function() end
end
"#,
)
.set_name("source1")
.exec()?;
let function1 = globals.get::<_, Function>("function1")?;
let function2 = function1.call::<_, Function>(())?;
let function3 = lua.create_function(|_, ()| Ok(()))?;
let function1_info = function1.info();
#[cfg(feature = "luau")]
assert_eq!(function1_info.name.as_deref(), Some("function1"));
assert_eq!(function1_info.source.as_deref(), Some("source1"));
assert_eq!(function1_info.line_defined, Some(2));
#[cfg(not(feature = "luau"))]
assert_eq!(function1_info.last_line_defined, Some(4));
#[cfg(feature = "luau")]
assert_eq!(function1_info.last_line_defined, None);
assert_eq!(function1_info.what, "Lua");
let function2_info = function2.info();
assert_eq!(function2_info.name, None);
assert_eq!(function2_info.source.as_deref(), Some("source1"));
assert_eq!(function2_info.line_defined, Some(3));
#[cfg(not(feature = "luau"))]
assert_eq!(function2_info.last_line_defined, Some(3));
#[cfg(feature = "luau")]
assert_eq!(function2_info.last_line_defined, None);
assert_eq!(function2_info.what, "Lua");
let function3_info = function3.info();
assert_eq!(function3_info.name, None);
assert_eq!(function3_info.source.as_deref(), Some("=[C]"));
assert_eq!(function3_info.line_defined, None);
assert_eq!(function3_info.last_line_defined, None);
assert_eq!(function3_info.what, "C");
let print_info = globals.get::<_, Function>("print")?.info();
#[cfg(feature = "luau")]
assert_eq!(print_info.name.as_deref(), Some("print"));
assert_eq!(print_info.source.as_deref(), Some("=[C]"));
assert_eq!(print_info.what, "C");
assert_eq!(print_info.line_defined, None);
Ok(())
}
#[test]
fn test_function_pointer() -> Result<()> {
let lua = Lua::new();
let func1 = lua.load("return function() end").into_function()?;
let func2 = func1.call::<_, Function>(())?;
assert_eq!(func1.to_pointer(), func1.clone().to_pointer());
assert_ne!(func1.to_pointer(), func2.to_pointer());
Ok(())
}
#[cfg(feature = "luau")]
#[test]
fn test_function_deep_clone() -> Result<()> {
let lua = Lua::new();
lua.globals().set("a", 1)?;
let func1 = lua.load("a += 1; return a").into_function()?;
let func2 = func1.deep_clone();
assert_ne!(func1.to_pointer(), func2.to_pointer());
assert_eq!(func1.call::<_, i32>(())?, 2);
assert_eq!(func2.call::<_, i32>(())?, 3);
let rust_func = lua.create_function(|_, ()| Ok(42))?;
let rust_func2 = rust_func.deep_clone();
assert_eq!(rust_func.to_pointer(), rust_func2.to_pointer());
Ok(())
}
#[test]
fn test_function_wrap() -> Result<()> {
use mlua::Error;
let lua = Lua::new();
lua.globals()
.set("f", Function::wrap(|_, s: String| Ok(s)))?;
lua.load(r#"assert(f("hello") == "hello")"#).exec().unwrap();
let mut _i = false;
lua.globals().set(
"f",
Function::wrap_mut(move |lua, ()| {
_i = true;
lua.globals().get::<_, Function>("f")?.call::<_, ()>(())
}),
)?;
match lua.globals().get::<_, Function>("f")?.call::<_, ()>(()) {
Err(Error::CallbackError { ref cause, .. }) => match *cause.as_ref() {
Error::CallbackError { ref cause, .. } => match *cause.as_ref() {
Error::RecursiveMutCallback { .. } => {}
ref other => panic!("incorrect result: {other:?}"),
},
ref other => panic!("incorrect result: {other:?}"),
},
other => panic!("incorrect result: {other:?}"),
};
Ok(())
}
#[cfg(all(feature = "unstable", not(feature = "send")))]
#[test]
fn test_owned_function() -> Result<()> {
let lua = Lua::new();
let f = lua
.create_function(|_, ()| Ok("hello, world!"))?
.into_owned();
drop(lua);
let s = f.call::<_, String>(())?;
assert_eq!(s.to_string_lossy(), "hello, world!");
Ok(())
}
#[cfg(all(feature = "unstable", not(feature = "send")))]
#[test]
fn test_owned_function_drop() -> Result<()> {
let rc = std::sync::Arc::new(());
{
let lua = Lua::new();
lua.set_app_data(rc.clone());
let f1 = lua
.create_function(|_, ()| Ok("hello, world!"))?
.into_owned();
let f2 =
lua.create_function(move |_, ()| f1.to_ref().call::<_, std::string::String>(()))?;
assert_eq!(f2.call::<_, String>(())?.to_string_lossy(), "hello, world!");
}
assert_eq!(std::sync::Arc::strong_count(&rc), 1);
Ok(())
}