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use proc_macro2::TokenStream as TokenStream2;
use syn::{parse, ItemFn};
use crate::syntax::{
ast::{Idle, IdleArgs},
parse::util,
};
impl IdleArgs {
pub(crate) fn parse(tokens: TokenStream2) -> parse::Result<Self> {
crate::syntax::parse::idle_args(tokens)
}
}
impl Idle {
pub(crate) fn parse(args: IdleArgs, item: ItemFn) -> parse::Result<Self> {
let valid_signature = util::check_fn_signature(&item, false)
&& item.sig.inputs.len() == 1
&& util::type_is_bottom(&item.sig.output);
let name = item.sig.ident.to_string();
if valid_signature {
if let Some((context, Ok(rest))) = util::parse_inputs(item.sig.inputs, &name) {
if rest.is_empty() {
return Ok(Idle {
args,
attrs: item.attrs,
context,
name: item.sig.ident,
stmts: item.block.stmts,
});
}
}
}
Err(parse::Error::new(
item.sig.ident.span(),
&format!(
"this `#[idle]` function must have signature `fn({}::Context) -> !`",
name
),
))
}
}
|
