dfir_lang/graph/ops/
mod.rs

1//! DFIR's operators
2
3use std::collections::HashMap;
4use std::fmt::{Debug, Display};
5use std::ops::{Bound, RangeBounds};
6use std::sync::OnceLock;
7
8use documented::DocumentedVariants;
9use proc_macro2::{Ident, Literal, Span, TokenStream};
10use quote::quote_spanned;
11use serde::{Deserialize, Serialize};
12use slotmap::Key;
13use syn::punctuated::Punctuated;
14use syn::{Expr, Token, parse_quote_spanned};
15
16use super::{
17    GraphLoopId, GraphNode, GraphNodeId, GraphSubgraphId, OpInstGenerics, OperatorInstance,
18    PortIndexValue,
19};
20use crate::diagnostic::{Diagnostic, Diagnostics, Level};
21use crate::parse::{Operator, PortIndex};
22
23/// The delay (soft barrier) type, for each input to an operator if needed.
24#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug, Serialize, Deserialize)]
25pub enum DelayType {
26    /// Input must be collected over the previous tick.
27    Tick,
28    /// Input must be collected over the previous tick but also not cause a new tick to occur.
29    TickLazy,
30    /// Input must be collected over the previous loop iteration. Causes the loop to re-fire.
31    Loop,
32    /// Input must be collected over the previous loop iteration. Does NOT cause the loop to re-fire.
33    LoopLazy,
34}
35
36/// Specification of the named (or unnamed) ports for an operator's inputs or outputs.
37pub enum PortListSpec {
38    /// Any number of unnamed (or optionally named) ports.
39    Variadic,
40    /// A specific number of named ports.
41    Fixed(Punctuated<PortIndex, Token![,]>),
42}
43
44/// An instance of this struct represents a single dfir operator.
45pub struct OperatorConstraints {
46    /// Operator's name.
47    pub name: &'static str,
48    /// Operator categories, for docs.
49    pub categories: &'static [OperatorCategory],
50
51    // TODO: generic argument ranges.
52    /// Input argument range required to not show an error.
53    pub hard_range_inn: &'static dyn RangeTrait<usize>,
54    /// Input argument range required to not show a warning.
55    pub soft_range_inn: &'static dyn RangeTrait<usize>,
56    /// Output argument range required to not show an error.
57    pub hard_range_out: &'static dyn RangeTrait<usize>,
58    /// Output argument range required to not show an warning.
59    pub soft_range_out: &'static dyn RangeTrait<usize>,
60    /// Number of arguments i.e. `operator(a, b, c)` has `num_args = 3`.
61    pub num_args: usize,
62    /// How many persistence lifetime arguments can be provided.
63    pub persistence_args: &'static dyn RangeTrait<usize>,
64    // /// How many (non-persistence) lifetime arguments can be provided.
65    // pub lifetime_args: &'static dyn RangeTrait<usize>,
66    /// How many generic type arguments can be provided.
67    pub type_args: &'static dyn RangeTrait<usize>,
68    /// If this operator receives external inputs and therefore must be in
69    /// stratum 0.
70    pub is_external_input: bool,
71    /// Flo semantics type.
72    pub flo_type: Option<FloType>,
73
74    /// What named or numbered input ports to expect?
75    pub ports_inn: Option<fn() -> PortListSpec>,
76    /// What named or numbered output ports to expect?
77    pub ports_out: Option<fn() -> PortListSpec>,
78
79    /// Determines if this input must be preceeded by a stratum barrier.
80    pub input_delaytype_fn: fn(&PortIndexValue) -> Option<DelayType>,
81    /// The operator's codegen. Returns code that is emited is several different locations. See [`OperatorWriteOutput`].
82    pub write_fn: WriteFn,
83}
84
85/// Type alias for [`OperatorConstraints::write_fn`]'s type.
86pub type WriteFn = fn(&WriteContextArgs<'_>, &mut Diagnostics) -> Result<OperatorWriteOutput, ()>;
87
88impl Debug for OperatorConstraints {
89    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
90        f.debug_struct("OperatorConstraints")
91            .field("name", &self.name)
92            .field("hard_range_inn", &self.hard_range_inn)
93            .field("soft_range_inn", &self.soft_range_inn)
94            .field("hard_range_out", &self.hard_range_out)
95            .field("soft_range_out", &self.soft_range_out)
96            .field("num_args", &self.num_args)
97            .field("persistence_args", &self.persistence_args)
98            .field("type_args", &self.type_args)
99            .field("is_external_input", &self.is_external_input)
100            .field("ports_inn", &self.ports_inn)
101            .field("ports_out", &self.ports_out)
102            // .field("input_delaytype_fn", &self.input_delaytype_fn)
103            // .field("flow_prop_fn", &self.flow_prop_fn)
104            // .field("write_fn", &self.write_fn)
105            .finish()
106    }
107}
108
109/// The code generated and returned by a [`OperatorConstraints::write_fn`].
110/// **Important**: When destructuring this struct in delegating operators, list all fields
111/// explicitly rather than using `..` to ensure new fields are not silently dropped.
112#[derive(Default)]
113pub struct OperatorWriteOutput {
114    /// Code which runs once outside any subgraphs to set up external state
115    /// (channels, network connections, etc.) to be used by the subgraph.
116    pub write_prologue: TokenStream,
117    /// Iterator (or pusherator) code inside the subgraphs. The code for each
118    /// operator is emitted in order.
119    ///
120    /// Emitted code should assign to [`WriteContextArgs::ident`] and use
121    /// [`WriteContextArgs::inputs`] (pull `Stream`s) or
122    /// [`WriteContextArgs::outputs`] (push `Sink`s).
123    pub write_iterator: TokenStream,
124    /// Code which runs after `Stream`s/`Sink`s have been run. Mainly for flushing IO.
125    pub write_iterator_after: TokenStream,
126    /// Code which runs at the end of each tick, after all subgraphs have run.
127    /// Used for resetting state with `'tick` persistence.
128    pub write_tick_end: TokenStream,
129}
130
131/// Convenience range: zero or more (any number).
132pub const RANGE_ANY: &'static dyn RangeTrait<usize> = &(0..);
133/// Convenience range: exactly zero.
134pub const RANGE_0: &'static dyn RangeTrait<usize> = &(0..=0);
135/// Convenience range: exactly one.
136pub const RANGE_1: &'static dyn RangeTrait<usize> = &(1..=1);
137
138/// Helper to write the `write_iterator` portion of [`OperatorConstraints::write_fn`] output for
139/// unary identity operators.
140pub fn identity_write_iterator_fn(
141    &WriteContextArgs {
142        root,
143        op_span,
144        ident,
145        inputs,
146        outputs,
147        is_pull,
148        op_inst:
149            OperatorInstance {
150                generics: OpInstGenerics { type_args, .. },
151                ..
152            },
153        ..
154    }: &WriteContextArgs<'_>,
155) -> TokenStream {
156    let generic_type = type_args
157        .first()
158        .map(quote::ToTokens::to_token_stream)
159        .unwrap_or_else(|| quote_spanned!(op_span=> _));
160
161    if is_pull {
162        let input = &inputs[0];
163        quote_spanned! {op_span=>
164            let #ident = {
165                fn check_input<Pull, Item>(pull: Pull) -> impl #root::dfir_pipes::pull::Pull<Item = Item, Meta = Pull::Meta, CanPend = Pull::CanPend, CanEnd = Pull::CanEnd>
166                where
167                    Pull: #root::dfir_pipes::pull::Pull<Item = Item>,
168                {
169                    pull
170                }
171                check_input::<_, #generic_type>(#input)
172            };
173        }
174    } else {
175        let output = &outputs[0];
176        quote_spanned! {op_span=>
177            let #ident = {
178                fn check_output<Psh, Item>(push: Psh) -> impl #root::dfir_pipes::push::Push<Item, (), CanPend = Psh::CanPend>
179                where
180                    Psh: #root::dfir_pipes::push::Push<Item, ()>,
181                {
182                    push
183                }
184                check_output::<_, #generic_type>(#output)
185            };
186        }
187    }
188}
189
190/// [`OperatorConstraints::write_fn`] for unary identity operators.
191pub const IDENTITY_WRITE_FN: WriteFn = |write_context_args, _| {
192    let write_iterator = identity_write_iterator_fn(write_context_args);
193    Ok(OperatorWriteOutput {
194        write_iterator,
195        ..Default::default()
196    })
197};
198
199/// Helper to write the `write_iterator` portion of [`OperatorConstraints::write_fn`] output for
200/// the null operator - an operator that ignores all inputs and produces no output.
201pub fn null_write_iterator_fn(
202    &WriteContextArgs {
203        root,
204        op_span,
205        ident,
206        inputs,
207        outputs,
208        is_pull,
209        op_inst:
210            OperatorInstance {
211                generics: OpInstGenerics { type_args, .. },
212                ..
213            },
214        ..
215    }: &WriteContextArgs<'_>,
216) -> TokenStream {
217    let default_type = parse_quote_spanned! {op_span=> _};
218    let iter_type = type_args.first().unwrap_or(&default_type);
219
220    if is_pull {
221        quote_spanned! {op_span=>
222            let #ident = #root::dfir_pipes::pull::poll_fn({
223                #(
224                    let mut #inputs = ::std::boxed::Box::pin(#inputs);
225                )*
226                move |_cx| {
227                    // Make sure to poll all `#inputs` to completion.
228                    // NOTE(mingwei): `null()` can only have 0 or 1 inputs, though.
229                    // TODO(mingwei): Do we actually need to poll to completion or can we short-circuit?
230                    #(
231                        let #inputs = #root::dfir_pipes::pull::Pull::pull(
232                            ::std::pin::Pin::as_mut(&mut #inputs),
233                            <_ as #root::dfir_pipes::Context>::from_task(_cx),
234                        );
235                    )*
236                    #(
237                        if let #root::dfir_pipes::pull::PullStep::Pending(_) = #inputs {
238                            return #root::dfir_pipes::pull::PullStep::Pending(#root::dfir_pipes::Yes);
239                        }
240                    )*
241                    #root::dfir_pipes::pull::PullStep::<_, _, #root::dfir_pipes::Yes, _>::Ended(#root::dfir_pipes::Yes)
242                }
243            });
244        }
245    } else {
246        quote_spanned! {op_span=>
247            #[allow(clippy::let_unit_value)]
248            let _ = (#(#outputs),*);
249            let #ident = #root::dfir_pipes::push::for_each::<_, #iter_type>(::std::mem::drop::<#iter_type>);
250        }
251    }
252}
253
254/// [`OperatorConstraints::write_fn`] for the null operator - an operator that ignores all inputs
255/// and produces no output.
256pub const NULL_WRITE_FN: WriteFn = |write_context_args, _| {
257    let write_iterator = null_write_iterator_fn(write_context_args);
258    Ok(OperatorWriteOutput {
259        write_iterator,
260        ..Default::default()
261    })
262};
263
264macro_rules! declare_ops {
265    ( $( $mod:ident :: $op:ident, )* ) => {
266        $( pub(crate) mod $mod; )*
267        /// All DFIR operators.
268        pub const OPERATORS: &[OperatorConstraints] = &[
269            $( $mod :: $op, )*
270        ];
271    };
272}
273declare_ops![
274    all_iterations::ALL_ITERATIONS,
275    anti_join::ANTI_JOIN,
276    assert::ASSERT,
277    assert_eq::ASSERT_EQ,
278    batch::BATCH,
279    batch_lazy::BATCH_LAZY,
280    chain::CHAIN,
281    chain_first_n::CHAIN_FIRST_N,
282    _counter::_COUNTER,
283    cross_join::CROSS_JOIN,
284    cross_join_multiset::CROSS_JOIN_MULTISET,
285    cross_singleton::CROSS_SINGLETON,
286    demux_enum::DEMUX_ENUM,
287    dest_file::DEST_FILE,
288    dest_sink::DEST_SINK,
289    dest_sink_serde::DEST_SINK_SERDE,
290    difference::DIFFERENCE,
291    enumerate::ENUMERATE,
292    filter::FILTER,
293    filter_map::FILTER_MAP,
294    flat_map::FLAT_MAP,
295    flat_map_stream_blocking::FLAT_MAP_STREAM_BLOCKING,
296    flatten::FLATTEN,
297    flatten_stream_blocking::FLATTEN_STREAM_BLOCKING,
298    fold::FOLD,
299    fold_no_replay::FOLD_NO_REPLAY,
300    for_each::FOR_EACH,
301    identity::IDENTITY,
302    initialize::INITIALIZE,
303    inspect::INSPECT,
304    iter_ref::ITER_REF,
305    join::JOIN,
306    join_fused::JOIN_FUSED,
307    join_fused_lhs::JOIN_FUSED_LHS,
308    join_fused_rhs::JOIN_FUSED_RHS,
309    join_multiset::JOIN_MULTISET,
310    join_multiset_half::JOIN_MULTISET_HALF,
311    fold_keyed::FOLD_KEYED,
312    reduce_keyed::REDUCE_KEYED,
313    lattice_bimorphism::LATTICE_BIMORPHISM,
314    _lattice_fold_batch::_LATTICE_FOLD_BATCH,
315    lattice_fold::LATTICE_FOLD,
316    _lattice_join_fused_join::_LATTICE_JOIN_FUSED_JOIN,
317    lattice_reduce::LATTICE_REDUCE,
318    map::MAP,
319    union::UNION,
320    multiset_delta::MULTISET_DELTA,
321    defer_signal::DEFER_SIGNAL,
322    defer_tick::DEFER_TICK,
323    defer_tick_lazy::DEFER_TICK_LAZY,
324    null::NULL,
325    partition::PARTITION,
326    persist::PERSIST,
327    resolve_futures::RESOLVE_FUTURES,
328    resolve_futures_blocking::RESOLVE_FUTURES_BLOCKING,
329    resolve_futures_blocking_ordered::RESOLVE_FUTURES_BLOCKING_ORDERED,
330    resolve_futures_ordered::RESOLVE_FUTURES_ORDERED,
331    reduce::REDUCE,
332    reduce_no_replay::REDUCE_NO_REPLAY,
333    scan::SCAN,
334    scan_async_blocking::SCAN_ASYNC_BLOCKING,
335    spin::SPIN,
336    sort::SORT,
337    sort_by_key::SORT_BY_KEY,
338    source_file::SOURCE_FILE,
339    source_interval::SOURCE_INTERVAL,
340    source_iter::SOURCE_ITER,
341    source_json::SOURCE_JSON,
342    source_stdin::SOURCE_STDIN,
343    source_stream::SOURCE_STREAM,
344    source_stream_serde::SOURCE_STREAM_SERDE,
345    state::STATE,
346    state_by::STATE_BY,
347    tee::TEE,
348    unique::UNIQUE,
349    unzip::UNZIP,
350    zip::ZIP,
351    zip_longest::ZIP_LONGEST,
352];
353
354/// Get the operator lookup table, generating it if needed.
355pub fn operator_lookup() -> &'static HashMap<&'static str, &'static OperatorConstraints> {
356    pub static OPERATOR_LOOKUP: OnceLock<HashMap<&'static str, &'static OperatorConstraints>> =
357        OnceLock::new();
358    OPERATOR_LOOKUP.get_or_init(|| OPERATORS.iter().map(|op| (op.name, op)).collect())
359}
360/// Find an operator by [`GraphNode`].
361pub fn find_node_op_constraints(node: &GraphNode) -> Option<&'static OperatorConstraints> {
362    if let GraphNode::Operator(operator) = node {
363        find_op_op_constraints(operator)
364    } else {
365        None
366    }
367}
368/// Find an operator by an AST [`Operator`].
369pub fn find_op_op_constraints(operator: &Operator) -> Option<&'static OperatorConstraints> {
370    let name = &*operator.name_string();
371    operator_lookup().get(name).copied()
372}
373
374/// Context arguments provided to [`OperatorConstraints::write_fn`].
375#[derive(Clone)]
376pub struct WriteContextArgs<'a> {
377    /// `dfir` crate name for `use #root::something`.
378    pub root: &'a TokenStream,
379    /// `context` ident, the name of the provided
380    /// [`dfir_rs::scheduled::Context`](https://hydro.run/rustdoc/dfir_rs/scheduled/context/struct.Context.html).
381    pub context: &'a Ident,
382    /// `df` ident, the name of the
383    /// [`dfir_rs::scheduled::graph::Dfir`](https://hydro.run/rustdoc/dfir_rs/scheduled/graph/struct.Dfir.html)
384    /// instance.
385    pub df_ident: &'a Ident,
386    /// Subgraph ID in which this operator is contained.
387    pub subgraph_id: GraphSubgraphId,
388    /// Node ID identifying this operator in the flat or partitioned graph meta-datastructure.
389    pub node_id: GraphNodeId,
390    /// Loop ID in which this operator is contained, or `None` if not in a loop.
391    pub loop_id: Option<GraphLoopId>,
392    /// The source span of this operator.
393    pub op_span: Span,
394    /// Tag for this operator appended to the generated identifier.
395    pub op_tag: Option<String>,
396    /// Identifier for a function to call when doing work outside the stream.
397    pub work_fn: &'a Ident,
398    /// Identifier for a function to wrap futures when doing work outside the stream.
399    pub work_fn_async: &'a Ident,
400
401    /// Ident the `Stream` or `Sink` should be assigned to.
402    pub ident: &'a Ident,
403    /// If a pull `Stream` (true) or push `Sink` (false) should be used.
404    pub is_pull: bool,
405    /// Input `Stream` operator idents (or ref idents; used for pull).
406    pub inputs: &'a [Ident],
407    /// Output `Sink` operator idents (or ref idents; used for push).
408    pub outputs: &'a [Ident],
409
410    /// Operator name.
411    pub op_name: &'static str,
412    /// Operator instance arguments object.
413    pub op_inst: &'a OperatorInstance,
414    /// Arguments provided by the user into the operator as arguments.
415    /// I.e. the `a, b, c` in `-> my_op(a, b, c) -> `.
416    ///
417    /// These arguments include singleton postprocessing codegen, with
418    /// [`std::cell::RefCell::borrow_mut`] code pre-generated.
419    pub arguments: &'a Punctuated<Expr, Token![,]>,
420}
421impl WriteContextArgs<'_> {
422    /// Generate a (almost certainly) unique identifier with the given suffix.
423    ///
424    /// Includes the subgraph and node IDs in the generated identifier.
425    ///
426    /// This will always return the same identifier for a given `suffix`.
427    pub fn make_ident(&self, suffix: impl AsRef<str>) -> Ident {
428        Ident::new(
429            &format!(
430                "sg_{:?}_node_{:?}_{}",
431                self.subgraph_id.data(),
432                self.node_id.data(),
433                suffix.as_ref(),
434            ),
435            self.op_span,
436        )
437    }
438
439    /// Returns the given number of persistence arguments, defaulting to `'tick` when unspecified.
440    pub fn persistence_args<const N: usize>(
441        &self,
442        diagnostics: &mut Diagnostics,
443    ) -> [Persistence; N] {
444        let len = self.op_inst.generics.persistence_args.len();
445        if 0 != len && 1 != len && N != len {
446            diagnostics.push(Diagnostic::spanned(
447                self.op_span,
448                Level::Error,
449                format!(
450                    "The operator `{}` only accepts 0, 1, or {} persistence arguments",
451                    self.op_name, N
452                ),
453            ));
454        }
455
456        let mut out = [Persistence::Tick; N];
457        self.op_inst
458            .generics
459            .persistence_args
460            .iter()
461            .copied()
462            .cycle() // Re-use the first element for both persistences.
463            .take(N)
464            .enumerate()
465            .for_each(|(i, p)| {
466                out[i] = p;
467            });
468        out
469    }
470}
471
472/// An object-safe version of [`RangeBounds`].
473pub trait RangeTrait<T>: Send + Sync + Debug
474where
475    T: ?Sized,
476{
477    /// Start (lower) bound.
478    fn start_bound(&self) -> Bound<&T>;
479    /// End (upper) bound.
480    fn end_bound(&self) -> Bound<&T>;
481    /// Returns if `item` is contained in this range.
482    fn contains(&self, item: &T) -> bool
483    where
484        T: PartialOrd<T>;
485
486    /// Turn this range into a human-readable string.
487    fn human_string(&self) -> String
488    where
489        T: Display + PartialEq,
490    {
491        match (self.start_bound(), self.end_bound()) {
492            (Bound::Unbounded, Bound::Unbounded) => "any number of".to_owned(),
493
494            (Bound::Included(n), Bound::Included(x)) if n == x => {
495                format!("exactly {}", n)
496            }
497            (Bound::Included(n), Bound::Included(x)) => {
498                format!("at least {} and at most {}", n, x)
499            }
500            (Bound::Included(n), Bound::Excluded(x)) => {
501                format!("at least {} and less than {}", n, x)
502            }
503            (Bound::Included(n), Bound::Unbounded) => format!("at least {}", n),
504            (Bound::Excluded(n), Bound::Included(x)) => {
505                format!("more than {} and at most {}", n, x)
506            }
507            (Bound::Excluded(n), Bound::Excluded(x)) => {
508                format!("more than {} and less than {}", n, x)
509            }
510            (Bound::Excluded(n), Bound::Unbounded) => format!("more than {}", n),
511            (Bound::Unbounded, Bound::Included(x)) => format!("at most {}", x),
512            (Bound::Unbounded, Bound::Excluded(x)) => format!("less than {}", x),
513        }
514    }
515}
516
517impl<R, T> RangeTrait<T> for R
518where
519    R: RangeBounds<T> + Send + Sync + Debug,
520{
521    fn start_bound(&self) -> Bound<&T> {
522        self.start_bound()
523    }
524
525    fn end_bound(&self) -> Bound<&T> {
526        self.end_bound()
527    }
528
529    fn contains(&self, item: &T) -> bool
530    where
531        T: PartialOrd<T>,
532    {
533        self.contains(item)
534    }
535}
536
537/// Persistence lifetimes: `'none`, `'loop`, `'tick`, or `'static`.
538#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug, Serialize, Deserialize)]
539pub enum Persistence {
540    /// Persistence for one "tick" (or loop iteration), i.e. no persistance at all
541    Tick,
542    /// Persistence across the entire program execution.
543    Static,
544}
545impl Persistence {
546    /// Returns a lowercase string for the persistence type.
547    pub fn to_str_lowercase(self) -> &'static str {
548        match self {
549            Persistence::Tick => "tick",
550            Persistence::Static => "static",
551        }
552    }
553}
554
555/// Helper which creates a error message string literal for when the Tokio runtime is not found.
556fn make_missing_runtime_msg(op_name: &str) -> Literal {
557    Literal::string(&format!(
558        "`{}()` must be used within a Tokio runtime. For example, use `#[dfir_rs::main]` on your main method.",
559        op_name
560    ))
561}
562
563/// Operator categories, for docs.
564#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, DocumentedVariants)]
565pub enum OperatorCategory {
566    /// Maps: Simple one-in-one-out operators.
567    Map,
568    /// Filters: One-in zero-or-one-out operators.
569    Filter,
570    /// Flattens: One-in multiple-out operators.
571    Flatten,
572    /// Folds: Operators which accumulate elements together.
573    Fold,
574    /// Keyed Folds: Operators which accumulate elements together by key.
575    KeyedFold,
576    /// Lattice Folds: Folds based on lattice-merge.
577    LatticeFold,
578    /// Persistent Operators: Persistent (stateful) operators.
579    Persistence,
580    /// Multi-Input Operators: Operators with multiple inputs.
581    MultiIn,
582    /// Multi-Output Operators: Operators with multiple outputs.
583    MultiOut,
584    /// Sources: Operators which produce output elements (and consume no inputs).
585    Source,
586    /// Sinks: Operators which consume input elements (and produce no outputs).
587    Sink,
588    /// Control Flow Operators: Operators which affect control flow/scheduling.
589    Control,
590    /// Compiler Fusion Operators: Operators which are necessary to implement certain optimizations and rewrite rules.
591    CompilerFusionOperator,
592    /// Windowing Operators: Operators for windowing `loop` inputs.
593    Windowing,
594    /// Un-Windowing Operators: Operators for collecting `loop` outputs.
595    Unwindowing,
596}
597impl OperatorCategory {
598    /// Human-readible heading name, for docs.
599    pub fn name(self) -> &'static str {
600        self.get_variant_docs().split_once(":").unwrap().0
601    }
602    /// Human description, for docs.
603    pub fn description(self) -> &'static str {
604        self.get_variant_docs().split_once(":").unwrap().1
605    }
606}
607
608/// Operator type for Flo semantics.
609#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug)]
610pub enum FloType {
611    /// A source operator, which must be at the top level.
612    Source,
613    /// A windowing operator, for moving data into a loop context.
614    Windowing,
615    /// A lazy windowing operator — moves data into a loop context but does not trigger the loop.
616    /// Data is dropped if the loop does not fire that tick.
617    WindowingLazy,
618    /// An un-windowing operator, for moving data out of a loop context.
619    Unwindowing,
620}
dfir_lang/graph/ops/mod.rs

dfir_lang/graph/ops/
mod.rs
