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use quote::{ToTokens, quote_spanned};
use super::{
OperatorCategory, OperatorConstraints, OperatorWriteOutput, RANGE_0, RANGE_1, RANGE_ANY,
WriteContextArgs,
};
/// > 1 input stream, *n* output streams
///
/// Takes the input stream and delivers a copy of each item to each output.
/// > Note: Downstream operators may need explicit type annotations.
///
/// ```dfir
/// my_tee = source_iter(vec!["Hello", "World"]) -> tee();
/// my_tee -> map(|x: &str| x.to_uppercase()) -> assert_eq(["HELLO", "WORLD"]);
/// my_tee -> map(|x: &str| x.to_lowercase()) -> assert_eq(["hello", "world"]);
/// my_tee -> assert_eq(["Hello", "World"]);
/// ```
pub const TEE: OperatorConstraints = OperatorConstraints {
name: "tee",
categories: &[OperatorCategory::MultiOut],
hard_range_inn: RANGE_1,
soft_range_inn: RANGE_1,
hard_range_out: RANGE_ANY,
soft_range_out: &(2..),
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,
op_span,
op_name,
ident,
inputs,
outputs,
is_pull,
..
},
_| {
let write_iterator = if !is_pull {
let tees = outputs
.iter()
.rev()
.map(|i| i.to_token_stream())
.reduce(|b, a|
quote_spanned! {op_span=> #root::dfir_pipes::push::fanout(#a, #b) },
)
.unwrap_or_else(
|| quote_spanned! {op_span=> #root::dfir_pipes::push::for_each(::std::mem::drop) },
);
quote_spanned! {op_span=>
let #ident = #tees;
}
} else {
// Pull.
assert_eq!(1, inputs.len());
assert_eq!(
1,
outputs.len(),
"`{}()` marked as pull should have exactly one output, actually has {}. This is a bug.",
op_name,
outputs.len()
);
let input = &inputs[0];
quote_spanned! {op_span=>
let #ident = #input;
}
};
Ok(OperatorWriteOutput {
write_iterator,
..Default::default()
})
},
};