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|
use proc_macro2::TokenStream as TokenStream2;
use syn::{parse, ItemFn};
use crate::syntax::{
ast::{Init, InitArgs},
parse::{self as syntax_parse, util},
};
impl InitArgs {
pub(crate) fn parse(tokens: TokenStream2) -> parse::Result<Self> {
syntax_parse::init_args(tokens)
}
}
impl Init {
pub(crate) fn parse(args: InitArgs, item: ItemFn) -> parse::Result<Self> {
let valid_signature = util::check_fn_signature(&item, false) && item.sig.inputs.len() == 1;
let span = item.sig.ident.span();
let name = item.sig.ident.to_string();
if valid_signature {
if let Ok((user_shared_struct, user_local_struct)) =
util::type_is_init_return(&item.sig.output)
{
if let Some((context, Ok(rest))) = util::parse_inputs(item.sig.inputs, &name) {
if rest.is_empty() {
return Ok(Init {
args,
attrs: item.attrs,
context,
name: item.sig.ident,
stmts: item.block.stmts,
user_shared_struct,
user_local_struct,
});
}
}
}
}
Err(parse::Error::new(
span,
format!(
"the `#[init]` function must have signature `fn({name}::Context) -> (Shared resources struct, Local resources struct)`"
),
))
}
}
|
