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use syn::{
parse_quote,
punctuated::Punctuated,
Path,
};
use std::collections::{
HashMap,
HashSet,
};
#[derive(Debug, Default, Clone)]
pub struct DerivesRegistry {
default_derives: Derives,
specific_type_derives: HashMap<syn::TypePath, Derives>,
}
impl DerivesRegistry {
pub fn extend_for_all(&mut self, derives: impl IntoIterator<Item = syn::Path>) {
self.default_derives.derives.extend(derives)
}
pub fn extend_for_type(
&mut self,
ty: syn::TypePath,
derives: impl IntoIterator<Item = syn::Path>,
) {
let type_derives = self
.specific_type_derives
.entry(ty)
.or_insert_with(Derives::default);
type_derives.derives.extend(derives)
}
pub fn default_derives(&self) -> &Derives {
&self.default_derives
}
pub fn resolve(&self, ty: &syn::TypePath) -> Derives {
let mut defaults = self.default_derives.derives.clone();
if let Some(specific) = self.specific_type_derives.get(ty) {
defaults.extend(specific.derives.iter().cloned());
}
Derives { derives: defaults }
}
}
#[derive(Debug, Clone)]
pub struct Derives {
derives: HashSet<syn::Path>,
}
impl FromIterator<syn::Path> for Derives {
fn from_iter<T: IntoIterator<Item = Path>>(iter: T) -> Self {
let derives = iter.into_iter().collect();
Self { derives }
}
}
impl Derives {
pub fn insert_codec_compact_as(&mut self) {
self.insert(parse_quote!(::subxt::ext::codec::CompactAs));
}
pub fn append(&mut self, derives: impl Iterator<Item = syn::Path>) {
for derive in derives {
self.insert(derive)
}
}
pub fn insert(&mut self, derive: syn::Path) {
self.derives.insert(derive);
}
}
impl Default for Derives {
fn default() -> Self {
let mut derives = HashSet::new();
derives.insert(syn::parse_quote!(::subxt::ext::codec::Encode));
derives.insert(syn::parse_quote!(::subxt::ext::codec::Decode));
derives.insert(syn::parse_quote!(Debug));
Self { derives }
}
}
impl quote::ToTokens for Derives {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
if !self.derives.is_empty() {
let mut sorted = self.derives.iter().cloned().collect::<Vec<_>>();
sorted.sort_by(|a, b| {
quote::quote!(#a)
.to_string()
.cmp("e::quote!(#b).to_string())
});
let derives: Punctuated<syn::Path, syn::Token![,]> =
sorted.iter().cloned().collect();
tokens.extend(quote::quote! {
#[derive(#derives)]
})
}
}
}