1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
use quote::quote_spanned;
use super::{
OperatorCategory, OperatorConstraints, OperatorWriteOutput, RANGE_0, RANGE_1, WriteContextArgs,
};
/// This operator emits Unit, and triggers the start of a new tick at the end of each tick,
/// which will cause spinning-like behavior. Note that `run_available` will run forever,
/// so in the example below we illustrate running manually for 100 ticks.
///
/// ```rustbook
/// let mut flow = dfir_rs::dfir_syntax! {
/// spin() -> for_each(|x| println!("tick {}: {:?}", context.current_tick(), x));
/// };
/// for _ in 1..100 {
/// flow.run_tick();
/// }
/// ```
pub const SPIN: OperatorConstraints = OperatorConstraints {
name: "spin",
categories: &[OperatorCategory::Source],
hard_range_inn: RANGE_0,
soft_range_inn: RANGE_0,
hard_range_out: RANGE_1,
soft_range_out: RANGE_1,
num_args: 0,
persistence_args: RANGE_0,
type_args: RANGE_0,
is_external_input: false,
has_singleton_output: false,
flo_type: None,
ports_inn: None,
ports_out: None,
input_delaytype_fn: |_| None,
write_fn: |&WriteContextArgs {
root,
context,
op_span,
ident,
is_pull,
..
},
_| {
assert!(is_pull);
let write_iterator = quote_spanned! {op_span=>
let #ident = #root::dfir_pipes::pull::once(());
};
let write_iterator_after = quote_spanned! {op_span=>
#context.schedule_subgraph(#context.current_subgraph(), true);
};
Ok(OperatorWriteOutput {
write_iterator,
write_iterator_after,
..Default::default()
})
},
};