95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
use std::marker::PhantomData;
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use futures::future::try_join_all;
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use lua_typed::Typed;
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use mlua::{FromLua, IntoLuaMulti};
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#[derive(Debug, Clone)]
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pub struct ActionCallback<P> {
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callbacks: Vec<mlua::Function>,
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_parameters: PhantomData<P>,
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}
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impl Typed for ActionCallback<()> {
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fn type_name() -> String {
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"fun() | fun()[]".into()
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}
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}
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impl<A: Typed> Typed for ActionCallback<A> {
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fn type_name() -> String {
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let type_name = A::type_name();
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format!("fun(_: {type_name}) | fun(_: {type_name})[]")
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}
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}
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impl<A: Typed, B: Typed> Typed for ActionCallback<(A, B)> {
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fn type_name() -> String {
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let type_name_a = A::type_name();
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let type_name_b = B::type_name();
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format!(
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"fun(_: {type_name_a}, _: {type_name_b}) | fun(_: {type_name_a}, _: {type_name_b})[]"
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)
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}
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}
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// NOTE: For some reason the derive macro combined with PhantomData leads to issues where it
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// requires all types part of P to implement default, even if they never actually get constructed.
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// By manually implemented Default it works fine.
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impl<P> Default for ActionCallback<P> {
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fn default() -> Self {
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Self {
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callbacks: Default::default(),
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_parameters: Default::default(),
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}
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}
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}
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impl<P> FromLua for ActionCallback<P> {
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fn from_lua(value: mlua::Value, _lua: &mlua::Lua) -> mlua::Result<Self> {
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let callbacks = match value {
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mlua::Value::Function(f) => vec![f],
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mlua::Value::Table(table) => table
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.pairs::<mlua::Value, mlua::Function>()
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.map(|pair| {
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let (_, f) = pair?;
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Ok::<_, mlua::Error>(f)
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})
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.try_collect()?,
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_ => {
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return Err(mlua::Error::FromLuaConversionError {
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from: value.type_name(),
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to: "ActionCallback".into(),
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message: Some("expected function or table of functions".into()),
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});
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}
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};
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Ok(ActionCallback {
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callbacks,
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_parameters: PhantomData::<P>,
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})
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}
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}
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// TODO: Return proper error here
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impl<P> ActionCallback<P>
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where
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P: IntoLuaMulti + Sync + Clone,
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{
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pub async fn call(&self, parameters: P) {
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try_join_all(
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self.callbacks
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.iter()
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.map(async |f| f.call_async::<()>(parameters.clone()).await),
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)
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.await
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.unwrap();
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}
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pub fn is_empty(&self) -> bool {
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self.callbacks.is_empty()
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}
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}
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