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use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, ToTokens};
use syn::{Attribute, Generics, Ident, Meta};
pub fn contains_skip(attrs: &[Attribute]) -> bool {
for attr in attrs.iter() {
if let Ok(Meta::Path(path)) = attr.parse_meta() {
if path.to_token_stream().to_string().as_str() == "borsh_skip" {
return true;
}
}
}
false
}
pub fn declaration(
ident_str: &String,
generics: &Generics,
cratename: Ident,
) -> (TokenStream2, Vec<TokenStream2>) {
let (_, _, where_clause_generics) = generics.split_for_impl();
let mut declaration_params = vec![];
let mut where_clause = vec![];
if let Some(where_clause_generics) = where_clause_generics {
let where_clause_generics = &where_clause_generics.predicates;
where_clause.push(quote! {#where_clause_generics});
}
for type_param in generics.type_params() {
let type_param_name = &type_param.ident;
declaration_params.push(quote! {
<#type_param_name>::declaration()
});
where_clause.push(quote! {
#type_param_name: #cratename::BorshSchema
});
}
let result = if declaration_params.is_empty() {
quote! {
#ident_str.to_string()
}
} else {
quote! {
let params = #cratename::maybestd::vec![#(#declaration_params),*];
format!(r#"{}<{}>"#, #ident_str, params.join(", "))
}
};
(result, where_clause)
}