mlua/tests/function.rs

#![cfg_attr(
    all(feature = "luajit", target_os = "macos", target_arch = "x86_64"),
    feature(link_args)
)]

#[cfg_attr(
    all(feature = "luajit", target_os = "macos", target_arch = "x86_64"),
    link_args = "-pagezero_size 10000 -image_base 100000000"
)]
extern "system" {}

use mlua::{Function, Lua, Result, String};

#[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>(("hi", "wut"))?,
        "foobarbazbafhiwut"
    );

    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(())
}