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use quote::quote_spanned;
use syn::parse_quote;
use super::{
OperatorCategory, OperatorConstraints, OperatorWriteOutput, RANGE_0, RANGE_1, WriteContextArgs,
};
/// An operator representing a [lattice bimorphism](https://hydro.run/docs/dfir/lattices_crate/lattice_math#lattice-bimorphism).
///
/// > 2 input streams, of type `LhsItem` and `RhsItem`.
///
/// > Three argument, one `LatticeBimorphism` function `Func`, an `LhsState` singleton reference, and an `RhsState` singleton reference.
///
/// > 1 output stream of the output type of the `LatticeBimorphism` function.
///
/// The function must be a lattice bimorphism for both `(LhsState, RhsItem)` and `(RhsState, LhsItem)`.
///
/// ```dfir
/// use std::collections::HashSet;
/// use lattices::set_union::{CartesianProductBimorphism, SetUnionHashSet, SetUnionSingletonSet};
///
/// lhs = source_iter(0..3)
/// -> map(SetUnionSingletonSet::new_from)
/// -> state::<'static, SetUnionHashSet<u32>>();
/// rhs = source_iter(3..5)
/// -> map(SetUnionSingletonSet::new_from)
/// -> state::<'static, SetUnionHashSet<u32>>();
///
/// lhs -> [0]my_join;
/// rhs -> [1]my_join;
///
/// my_join = lattice_bimorphism(CartesianProductBimorphism::<HashSet<_>>::default(), #lhs, #rhs)
/// -> assert_eq([SetUnionHashSet::new(HashSet::from_iter([
/// (0, 3),
/// (0, 4),
/// (1, 3),
/// (1, 4),
/// (2, 3),
/// (2, 4),
/// ]))]);
/// ```
pub const LATTICE_BIMORPHISM: OperatorConstraints = OperatorConstraints {
name: "lattice_bimorphism",
categories: &[OperatorCategory::MultiIn],
hard_range_inn: &(2..=2),
soft_range_inn: &(2..=2),
hard_range_out: RANGE_1,
soft_range_out: RANGE_1,
num_args: 3,
persistence_args: RANGE_0,
type_args: RANGE_0,
is_external_input: false,
has_singleton_output: false,
flo_type: None,
ports_inn: Some(|| super::PortListSpec::Fixed(parse_quote! { 0, 1 })),
ports_out: None,
input_delaytype_fn: |_| None,
write_fn: |&WriteContextArgs {
root,
context,
op_span,
is_pull,
ident,
inputs,
arguments,
arguments_handles,
..
},
_| {
assert!(is_pull);
let func = &arguments[0];
let lhs_state_handle = &arguments_handles[1];
let rhs_state_handle = &arguments_handles[2];
let lhs_items = &inputs[0];
let rhs_items = &inputs[1];
let write_iterator = quote_spanned! {op_span=>
let #ident = {
let (lhs_state, rhs_state) = unsafe {
// SAFETY: handle from `#df_ident.add_state(..)`.
(
#context.state_ref_unchecked(#lhs_state_handle),
#context.state_ref_unchecked(#rhs_state_handle),
)
};
#[inline(always)]
fn check_inputs<'a, Func, LhsPull, RhsPull, LhsState, RhsState, Output>(
lhs_pull: LhsPull,
rhs_pull: RhsPull,
func: Func,
lhs_state: &'a ::std::cell::RefCell<LhsState>,
rhs_state: &'a ::std::cell::RefCell<RhsState>,
) -> impl #root::dfir_pipes::pull::Pull<
Item = Output,
Meta = (),
CanPend = <LhsPull::CanPend as #root::dfir_pipes::Toggle>::Or<RhsPull::CanPend>,
CanEnd = <LhsPull::CanEnd as #root::dfir_pipes::Toggle>::And<RhsPull::CanEnd>,
>
where
Func: 'a
+ #root::lattices::LatticeBimorphism<LhsState, RhsPull::Item, Output = Output>
+ #root::lattices::LatticeBimorphism<LhsPull::Item, RhsState, Output = Output>,
LhsPull: 'a + #root::dfir_pipes::pull::Pull,
RhsPull: 'a + #root::dfir_pipes::pull::Pull,
LhsState: 'static + ::std::clone::Clone,
RhsState: 'static + ::std::clone::Clone,
Output: #root::lattices::Merge<Output>,
{
#root::compiled::pull::LatticeBimorphismPull::new(
#root::dfir_pipes::pull::Pull::fuse(lhs_pull),
#root::dfir_pipes::pull::Pull::fuse(rhs_pull),
func,
lhs_state,
rhs_state,
)
}
check_inputs(
#lhs_items,
#rhs_items,
#func,
lhs_state,
rhs_state,
)
};
};
Ok(OperatorWriteOutput {
write_iterator,
..Default::default()
})
},
};