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use quote::quote_spanned;
use super::{
OperatorCategory, OperatorConstraints, OperatorWriteOutput,
WriteContextArgs, RANGE_0, RANGE_1,
};
/// > 1 input stream, 1 output stream
///
/// > Arguments: A Rust closure
///
/// For each item passed in, apply the closure to generate an item to emit.
///
/// If you do not want to modify the item stream and instead only want to view
/// each item use the [`inspect`](#inspect) operator instead.
///
/// > Note: The closure has access to the [`context` object](surface_flows.mdx#the-context-object).
///
/// ```dfir
/// source_iter(vec!["hello", "world"]) -> map(|x| x.to_uppercase())
/// -> assert_eq(["HELLO", "WORLD"]);
/// ```
pub const MAP: OperatorConstraints = OperatorConstraints {
name: "map",
categories: &[OperatorCategory::Map],
hard_range_inn: RANGE_1,
soft_range_inn: RANGE_1,
hard_range_out: RANGE_1,
soft_range_out: RANGE_1,
num_args: 1,
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,
ident,
inputs,
outputs,
is_pull,
arguments,
..
},
_| {
let func = &arguments[0];
let write_iterator = if is_pull {
let input = &inputs[0];
quote_spanned! {op_span=>
#[allow(clippy::map_clone, reason = "dfir has no explicit `cloned`/`copied` operator")]
let #ident = #root::dfir_pipes::pull::Pull::map(#input, #func);
}
} else {
let output = &outputs[0];
quote_spanned! {op_span=>
let #ident = #root::dfir_pipes::push::map(#func, #output);
}
};
Ok(OperatorWriteOutput {
write_iterator,
..Default::default()
})
},
};