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feat(hydroflow_lang): Added state_by operator. (#1469)
For #1467
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| use quote::{quote_spanned, ToTokens}; | ||
|
|
||
| use super::{ | ||
| OpInstGenerics, OperatorCategory, OperatorConstraints, OperatorInstance, OperatorWriteOutput, | ||
| Persistence, WriteContextArgs, RANGE_1, | ||
| }; | ||
| use crate::diagnostic::{Diagnostic, Level}; | ||
|
|
||
| /// List state operator, but with a closure to map the input to the state lattice. | ||
| /// | ||
| /// The emitted outputs (both the referencable singleton and the optional pass-through stream) are | ||
| /// of the same type as the inputs to the state_by operator and are not required to be a lattice | ||
| /// type. This is useful receiving pass-through context information on the output side. | ||
| /// | ||
| /// ```hydroflow | ||
| /// use std::collections::HashSet; | ||
| /// | ||
| /// use lattices::set_union::{CartesianProductBimorphism, SetUnionHashSet, SetUnionSingletonSet}; | ||
| /// | ||
| /// my_state = source_iter(0..3) | ||
| /// -> state_by::<SetUnionHashSet<usize>>(SetUnionSingletonSet::new_from); | ||
| /// ``` | ||
| pub const STATE_BY: OperatorConstraints = OperatorConstraints { | ||
| name: "state_by", | ||
| categories: &[OperatorCategory::Persistence], | ||
| hard_range_inn: RANGE_1, | ||
| soft_range_inn: RANGE_1, | ||
| hard_range_out: &(0..=1), | ||
| soft_range_out: &(0..=1), | ||
| num_args: 1, | ||
| persistence_args: &(0..=1), | ||
| type_args: &(0..=1), | ||
| is_external_input: false, | ||
| has_singleton_output: true, | ||
| ports_inn: None, | ||
| ports_out: None, | ||
| input_delaytype_fn: |_| None, | ||
| write_fn: |&WriteContextArgs { | ||
| root, | ||
| context, | ||
| hydroflow, | ||
| op_span, | ||
| ident, | ||
| inputs, | ||
| outputs, | ||
| is_pull, | ||
| singleton_output_ident, | ||
| op_name, | ||
| op_inst: | ||
| OperatorInstance { | ||
| generics: | ||
| OpInstGenerics { | ||
| type_args, | ||
| persistence_args, | ||
| .. | ||
| }, | ||
| .. | ||
| }, | ||
| arguments, | ||
| .. | ||
| }, | ||
| diagnostics| { | ||
| let lattice_type = type_args | ||
| .first() | ||
| .map(ToTokens::to_token_stream) | ||
| .unwrap_or(quote_spanned!(op_span=> _)); | ||
|
|
||
| let persistence = match persistence_args[..] { | ||
| [] => Persistence::Tick, | ||
| [Persistence::Mutable] => { | ||
| diagnostics.push(Diagnostic::spanned( | ||
| op_span, | ||
| Level::Error, | ||
| format!("{} does not support `'mut`.", op_name), | ||
| )); | ||
| Persistence::Tick | ||
| } | ||
| [a] => a, | ||
| _ => unreachable!(), | ||
| }; | ||
|
|
||
| let state_ident = singleton_output_ident; | ||
| let mut write_prologue = quote_spanned! {op_span=> | ||
| let #state_ident = #hydroflow.add_state(::std::cell::RefCell::new( | ||
| <#lattice_type as ::std::default::Default>::default() | ||
| )); | ||
| }; | ||
| if Persistence::Tick == persistence { | ||
| write_prologue.extend(quote_spanned! {op_span=> | ||
| #hydroflow.set_state_tick_hook(#state_ident, |rcell| { rcell.take(); }); // Resets state to `Default::default()`. | ||
| }); | ||
| } | ||
|
|
||
| let func = &arguments[0]; | ||
|
|
||
| // TODO(mingwei): deduplicate codegen | ||
| let write_iterator = if is_pull { | ||
| let input = &inputs[0]; | ||
| quote_spanned! {op_span=> | ||
| let #ident = { | ||
| fn check_input<'a, Item, MappingFn, MappedItem, Iter, Lat>( | ||
| iter: Iter, | ||
| mapfn: MappingFn, | ||
| state_handle: #root::scheduled::state::StateHandle<::std::cell::RefCell<Lat>>, | ||
| context: &'a #root::scheduled::context::Context, | ||
| ) -> impl 'a + ::std::iter::Iterator<Item = Item> | ||
| where | ||
| Item: ::std::clone::Clone, | ||
| MappingFn: 'a + Fn(Item) -> MappedItem, | ||
| Iter: 'a + ::std::iter::Iterator<Item = Item>, | ||
| Lat: 'static + #root::lattices::Merge<MappedItem>, | ||
| { | ||
| iter.filter(move |item| { | ||
| let state = context.state_ref(state_handle); | ||
| let mut state = state.borrow_mut(); | ||
| #root::lattices::Merge::merge(&mut *state, (mapfn)(::std::clone::Clone::clone(item))) | ||
| }) | ||
| } | ||
| check_input::<_, _, _, _, #lattice_type>(#input, #func, #state_ident, #context) | ||
| }; | ||
| } | ||
| } else if let Some(output) = outputs.first() { | ||
| quote_spanned! {op_span=> | ||
| let #ident = { | ||
| fn check_output<'a, Item, MappingFn, MappedItem, Push, Lat>( | ||
| push: Push, | ||
| mapfn: MappingFn, | ||
| state_handle: #root::scheduled::state::StateHandle<::std::cell::RefCell<Lat>>, | ||
| context: &'a #root::scheduled::context::Context, | ||
| ) -> impl 'a + #root::pusherator::Pusherator<Item = Item> | ||
| where | ||
| Item: 'a + ::std::clone::Clone, | ||
| MappingFn: 'a + Fn(Item) -> MappedItem, | ||
| Push: 'a + #root::pusherator::Pusherator<Item = Item>, | ||
| Lat: 'static + #root::lattices::Merge<MappedItem>, | ||
| { | ||
| #root::pusherator::filter::Filter::new(move |item| { | ||
| let state = context.state_ref(state_handle); | ||
| let mut state = state.borrow_mut(); | ||
| #root::lattices::Merge::merge(&mut *state, (mapfn)(::std::clone::Clone::clone(item))) | ||
| }, push) | ||
| } | ||
| check_output::<_, _, _, _, #lattice_type>(#output, #func, #state_ident, #context) | ||
| }; | ||
| } | ||
| } else { | ||
| quote_spanned! {op_span=> | ||
| let #ident = { | ||
| fn check_output<'a, Item, MappingFn, MappedItem, Lat>( | ||
| state_handle: #root::scheduled::state::StateHandle<::std::cell::RefCell<Lat>>, | ||
| mapfn: MappingFn, | ||
| context: &'a #root::scheduled::context::Context, | ||
| ) -> impl 'a + #root::pusherator::Pusherator<Item = Item> | ||
| where | ||
| Item: 'a, | ||
| MappedItem: 'a, | ||
| MappingFn: 'a + Fn(Item) -> MappedItem, | ||
| Lat: 'static + #root::lattices::Merge<MappedItem>, | ||
| { | ||
| #root::pusherator::for_each::ForEach::new(move |item| { | ||
| let state = context.state_ref(state_handle); | ||
| let mut state = state.borrow_mut(); | ||
| #root::lattices::Merge::merge(&mut *state, (mapfn)(item)); | ||
| }) | ||
| } | ||
| check_output::<_, _, _, #lattice_type>(#state_ident, #func, #context) | ||
| }; | ||
| } | ||
| }; | ||
| Ok(OperatorWriteOutput { | ||
| write_prologue, | ||
| write_iterator, | ||
| ..Default::default() | ||
| }) | ||
| }, | ||
| }; |