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use syn::{parse, ForeignItemFn, ItemFn, Stmt};
use crate::syntax::parse::util::FilterAttrs;
use crate::syntax::{
ast::{SoftwareTask, SoftwareTaskArgs},
parse::util,
};
impl SoftwareTask {
pub(crate) fn parse(args: SoftwareTaskArgs, item: ItemFn) -> parse::Result<Self> {
let is_bottom = util::type_is_bottom(&item.sig.output);
let valid_signature = util::check_fn_signature(&item, true)
&& (util::type_is_unit(&item.sig.output) || is_bottom)
&& item.sig.asyncness.is_some();
let span = item.sig.ident.span();
let name = item.sig.ident.to_string();
if valid_signature {
if let Some((context, Ok(inputs))) = util::parse_inputs(item.sig.inputs, &name) {
let FilterAttrs { cfgs, attrs, .. } = util::filter_attributes(item.attrs);
return Ok(SoftwareTask {
args,
attrs,
cfgs,
context,
inputs,
stmts: item.block.stmts,
is_extern: false,
is_bottom,
});
}
}
Err(parse::Error::new(
span,
format!("this task handler must have type signature `async fn({name}::Context, ..)` or `async fn({name}::Context, ..) -> !`"),
))
}
}
impl SoftwareTask {
pub(crate) fn parse_foreign(
args: SoftwareTaskArgs,
item: ForeignItemFn,
) -> parse::Result<Self> {
let is_bottom = util::type_is_bottom(&item.sig.output);
let valid_signature = util::check_foreign_fn_signature(&item, true)
&& (util::type_is_unit(&item.sig.output) || is_bottom)
&& item.sig.asyncness.is_some();
let span = item.sig.ident.span();
let name = item.sig.ident.to_string();
if valid_signature {
if let Some((context, Ok(inputs))) = util::parse_inputs(item.sig.inputs, &name) {
let FilterAttrs { cfgs, attrs, .. } = util::filter_attributes(item.attrs);
return Ok(SoftwareTask {
args,
attrs,
cfgs,
context,
inputs,
stmts: Vec::<Stmt>::new(),
is_extern: true,
is_bottom,
});
}
}
Err(parse::Error::new(
span,
format!("this task handler must have type signature `async fn({name}::Context, ..)` or `async fn({name}::Context, ..) -> !`"),
))
}
}
|
