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// RLX — versatile ML compiler + runtime.
// Copyright (C) 2026 Eugene Hauptmann, Nataliya Kosmyna.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
use std::fmt;
use std::sync::Arc;
use anyhow::Result;
use crate::context::FlowCtx;
use crate::escape::Emit;
use crate::value::FlowValue;
type CustomFn =
Arc<dyn Fn(&mut Emit<'_>, Option<FlowValue>) -> Result<Option<FlowValue>> + Send + Sync>;
/// User-defined stage — tier-2 escape hatch for novel subgraphs.
#[derive(Clone)]
pub struct CustomStage {
pub name: Option<String>,
f: CustomFn,
}
impl fmt::Debug for CustomStage {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("CustomStage")
.field("name", &self.name)
.finish_non_exhaustive()
}
}
impl CustomStage {
pub fn new<F>(f: F) -> Self
where
F: Fn(&mut Emit<'_>, Option<FlowValue>) -> Result<Option<FlowValue>>
+ Send
+ Sync
+ 'static,
{
Self {
name: None,
f: Arc::new(f),
}
}
pub fn named<F>(name: impl Into<String>, f: F) -> Self
where
F: Fn(&mut Emit<'_>, Option<FlowValue>) -> Result<Option<FlowValue>>
+ Send
+ Sync
+ 'static,
{
Self {
name: Some(name.into()),
f: Arc::new(f),
}
}
pub fn emit(
&self,
ctx: &mut FlowCtx<'_>,
input: Option<FlowValue>,
) -> Result<Option<FlowValue>> {
let mut emit = Emit::from_ctx(ctx);
(self.f)(&mut emit, input)
}
}