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use std::{marker::PhantomData, sync::Arc};
use mlua::{FromLua, IntoLua, Lua, Result, Value};
use crate::lua::ownedfunction::OwnedFunction;
#[derive(Clone, Debug)]
pub enum EvalTo<T, A> {
Function(Arc<OwnedFunction>, PhantomData<A>),
Value(T),
}
impl<T, A> EvalTo<T, A> {
pub fn get<'lua>(&'lua self, args: A, lua: &'lua Lua) -> Result<T>
where
T: FromLua<'lua> + Clone,
A: IntoLua<'lua>,
{
match self {
EvalTo::Function(value, _) => {
let func = value.get(lua);
T::from_lua(func.call(args)?, lua)
}
EvalTo::Value(value) => Ok(value.clone()),
}
}
pub const fn new(value: T) -> Self {
Self::Value(value)
}
}
impl<'lua, T, A> FromLua<'lua> for EvalTo<T, A>
where
T: FromLua<'lua> + Clone,
A: IntoLua<'lua>,
{
fn from_lua(
value: mlua::prelude::LuaValue<'lua>,
lua: &'lua mlua::prelude::Lua,
) -> Result<Self> {
if value.is_function() {
Ok(Self::Function(
Arc::new(OwnedFunction::new(value, lua)),
PhantomData,
))
} else {
Ok(Self::Value(T::from_lua(value, lua)?))
}
}
}
impl<'lua, T, A> IntoLua<'lua> for EvalTo<T, A>
where
T: FromLua<'lua> + Clone + IntoLua<'lua>,
A: IntoLua<'lua>,
{
fn into_lua(self, lua: &'lua mlua::prelude::Lua) -> Result<Value<'lua>> {
match self {
EvalTo::Function(value, _) => Ok(value.get(lua).into_lua(lua)?),
EvalTo::Value(value) => value.into_lua(lua),
}
}
}
impl<T, A> Default for EvalTo<T, A>
where
T: Default,
{
fn default() -> Self {
Self::Value(T::default())
}
}
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