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use quote::{quote_spanned, ToTokens};
use syn::parse_quote;
use super::{
DelayType, OpInstGenerics, OperatorCategory, OperatorConstraints,
OperatorInstance, OperatorWriteOutput, Persistence, PortIndexValue, WriteContextArgs, RANGE_0,
RANGE_1,
};
use crate::diagnostic::{Diagnostic, Level};
/// > 2 input streams the first of type (K, T), the second of type K,
/// > with output type (K, T)
///
/// For a given tick, computes the anti-join of the items in the input
/// streams, returning unique items in the `pos` input that do not have matching keys
/// in the `neg` input. Note this is set semantics only for the `neg element`. Order
/// is preserved for new elements in a given tick, but not for elements processed
/// in a previous tick with `'static`.
///
/// ```hydroflow
/// source_iter(vec![("dog", 1), ("cat", 2), ("elephant", 3)]) -> [pos]diff;
/// source_iter(vec!["dog", "cat", "gorilla"]) -> [neg]diff;
/// diff = anti_join() -> assert_eq([("elephant", 3)]);
/// ```
pub const ANTI_JOIN: OperatorConstraints = OperatorConstraints {
name: "anti_join",
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: 0,
persistence_args: &(0..=2),
type_args: RANGE_0,
is_external_input: false,
// If this is set to true, the state will need to be cleared using `#context.set_state_tick_hook`
// to prevent reading uncleared data if this subgraph doesn't run.
// https://github.com/hydro-project/hydroflow/issues/1298
has_singleton_output: false,
ports_inn: Some(|| super::PortListSpec::Fixed(parse_quote! { pos, neg })),
ports_out: None,
input_delaytype_fn: |idx| match idx {
PortIndexValue::Path(path) if "neg" == path.to_token_stream().to_string() => {
Some(DelayType::Stratum)
}
_else => None,
},
write_fn: |wc @ &WriteContextArgs {
root,
context,
hydroflow,
op_span,
ident,
inputs,
op_inst:
OperatorInstance {
generics:
OpInstGenerics {
persistence_args, ..
},
..
},
..
},
diagnostics| {
let persistences = match persistence_args[..] {
[] => [Persistence::Tick, Persistence::Tick],
[a] => [a, a],
[a, b] => [a, b],
_ => unreachable!(),
};
let mut make_antijoindata = |persistence, side| {
let antijoindata_ident = wc.make_ident(format!("antijoindata_{}", side));
let borrow_ident = wc.make_ident(format!("antijoindata_{}_borrow", side));
let (init, borrow) = match persistence {
Persistence::Tick => (
quote_spanned! {op_span=>
#root::util::monotonic_map::MonotonicMap::<_, #root::rustc_hash::FxHashSet<_>>::default()
},
quote_spanned! {op_span=>
&mut *#borrow_ident.get_mut_clear(#context.current_tick())
},
),
Persistence::Static => (
quote_spanned! {op_span=>
#root::rustc_hash::FxHashSet::default()
},
quote_spanned! {op_span=>
&mut *#borrow_ident
},
),
Persistence::Mutable => {
diagnostics.push(Diagnostic::spanned(
op_span,
Level::Error,
"An implementation of 'mutable does not exist",
));
return Err(());
}
};
Ok((antijoindata_ident, borrow_ident, init, borrow))
};
let (pos_antijoindata_ident, pos_borrow_ident, pos_init, pos_borrow) =
make_antijoindata(persistences[0], "pos")?;
let (neg_antijoindata_ident, neg_borrow_ident, neg_init, neg_borrow) =
make_antijoindata(persistences[1], "neg")?;
let write_prologue = quote_spanned! {op_span=>
let #neg_antijoindata_ident = #hydroflow.add_state(std::cell::RefCell::new(
#neg_init
));
let #pos_antijoindata_ident = #hydroflow.add_state(std::cell::RefCell::new(
#pos_init
));
};
let input_neg = &inputs[0]; // N before P
let input_pos = &inputs[1];
let write_iterator = {
quote_spanned! {op_span=>
let mut #neg_borrow_ident = #context.state_ref(#neg_antijoindata_ident).borrow_mut();
let mut #pos_borrow_ident = #context.state_ref(#pos_antijoindata_ident).borrow_mut();
let #ident = {
/// Limit error propagation by bounding locally, erasing output iterator type.
#[inline(always)]
fn check_inputs<'a, K, I1, V, I2>(
input_neg: I1,
input_pos: I2,
neg_state: &'a mut #root::rustc_hash::FxHashSet<K>,
pos_state: &'a mut #root::rustc_hash::FxHashSet<(K, V)>,
is_new_tick: bool,
) -> impl 'a + Iterator<Item = (K, V)>
where
K: Eq + ::std::hash::Hash + Clone,
V: Eq + ::std::hash::Hash + Clone,
I1: 'a + Iterator<Item = K>,
I2: 'a + Iterator<Item = (K, V)>,
{
neg_state.extend(input_neg);
#root::compiled::pull::anti_join_into_iter(input_pos, neg_state, pos_state, is_new_tick)
}
check_inputs(
#input_neg,
#input_pos,
#neg_borrow,
#pos_borrow,
context.is_first_run_this_tick(),
)
};
}
};
Ok(OperatorWriteOutput {
write_prologue,
write_iterator,
..Default::default()
})
},
};