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use quote::ToTokens;
use syn::parse::{Parse, ParseStream};
use syn::punctuated::Punctuated;
use syn::{parse, ItemType, Token, Type};
use crate::fn_trait::FnTrait;
pub struct FactoryTypeAlias
{
pub type_alias: ItemType,
pub factory_interface: FnTrait,
pub arg_types: Punctuated<Type, Token![,]>,
pub return_type: Type,
}
impl Parse for FactoryTypeAlias
{
fn parse(input: ParseStream) -> syn::Result<Self>
{
let type_alias = match input.parse::<ItemType>() {
Ok(type_alias) => Ok(type_alias),
Err(_) => Err(input.error("Expected a type alias")),
}?;
let aliased_fn_trait =
parse::<FnTrait>(type_alias.ty.as_ref().to_token_stream().into())?;
Ok(Self {
type_alias,
factory_interface: aliased_fn_trait.clone(),
arg_types: aliased_fn_trait.inputs,
return_type: aliased_fn_trait.output,
})
}
}
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