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use quote::quote_spanned;
use super::{
OperatorCategory, OperatorConstraints, OperatorWriteOutput, WriteContextArgs,
RANGE_0, RANGE_1,
};
/// > 1 input stream, 0 output streams
///
/// > Arguments: a Rust closure
///
/// Iterates through a stream passing each element to the closure in the
/// argument.
///
/// > Note: The closure has access to the [`context` object](surface_flows.mdx#the-context-object).
///
/// ```dfir
/// source_iter(vec!["Hello", "World"])
/// -> for_each(|x| println!("{}", x));
/// ```
pub const FOR_EACH: OperatorConstraints = OperatorConstraints {
name: "for_each",
categories: &[OperatorCategory::Sink],
hard_range_inn: RANGE_1,
soft_range_inn: RANGE_1,
hard_range_out: RANGE_0,
soft_range_out: RANGE_0,
num_args: 1,
persistence_args: RANGE_0,
type_args: RANGE_0,
is_external_input: false,
flo_type: None,
ports_inn: None,
ports_out: None,
input_delaytype_fn: |_| None,
write_fn: |&WriteContextArgs {
root,
op_span,
ident,
arguments,
..
},
_| {
let func = &arguments[0];
let write_iterator = quote_spanned! {op_span=>
let #ident = #root::dfir_pipes::push::for_each(#func);
};
Ok(OperatorWriteOutput {
write_iterator,
..Default::default()
})
},
};