use proc_macro2::TokenStream as TokenStream2;
use quote::quote;
use syn::{Fields, ItemStruct, Path};
use crate::internals::{attributes::item, deserialize, generics};
pub fn process(input: &ItemStruct, cratename: Path) -> syn::Result<TokenStream2> {
let name = &input.ident;
let generics = generics::without_defaults(&input.generics);
let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
let mut where_clause = generics::default_where(where_clause);
let mut body = TokenStream2::new();
let mut generics_output = deserialize::GenericsOutput::new(&generics);
let return_value = match &input.fields {
Fields::Named(fields) => {
for field in &fields.named {
deserialize::process_field(field, &cratename, &mut body, &mut generics_output)?;
}
quote! {
Self { #body }
}
}
Fields::Unnamed(fields) => {
for field in fields.unnamed.iter() {
deserialize::process_field(field, &cratename, &mut body, &mut generics_output)?;
}
quote! {
Self( #body )
}
}
Fields::Unit => {
quote! {
Self {}
}
}
};
generics_output.extend(&mut where_clause, &cratename);
if let Some(method_ident) = item::contains_initialize_with(&input.attrs)? {
Ok(quote! {
#[automatically_derived]
impl #impl_generics #cratename::de::BorshDeserialize for #name #ty_generics #where_clause {
fn deserialize_reader<__R: #cratename::io::Read>(reader: &mut __R) -> ::core::result::Result<Self, #cratename::io::Error> {
let mut return_value = #return_value;
return_value.#method_ident();
Ok(return_value)
}
}
})
} else {
Ok(quote! {
#[automatically_derived]
impl #impl_generics #cratename::de::BorshDeserialize for #name #ty_generics #where_clause {
fn deserialize_reader<__R: #cratename::io::Read>(reader: &mut __R) -> ::core::result::Result<Self, #cratename::io::Error> {
Ok(#return_value)
}
}
})
}
}
#[cfg(test)]
mod tests {
use crate::internals::test_helpers::{
default_cratename, local_insta_assert_snapshot, pretty_print_syn_str,
};
use super::*;
#[test]
fn simple_struct() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct A {
x: u64,
y: String,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn simple_struct_with_custom_crate() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct A {
x: u64,
y: String,
}
})
.unwrap();
let crate_: Path = syn::parse2(quote! { reexporter::borsh }).unwrap();
let actual = process(&item_struct, crate_).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn simple_generics() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct A<K, V> {
x: HashMap<K, V>,
y: String,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn simple_generic_tuple_struct() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct TupleA<T>(T, u32);
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn bound_generics() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct A<K: Key, V> where V: Value {
x: HashMap<K, V>,
y: String,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn recursive_struct() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct CRecC {
a: String,
b: HashMap<String, CRecC>,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn generic_tuple_struct_borsh_skip1() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct G<K, V, U> (
#[borsh(skip)]
HashMap<K, V>,
U,
);
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn generic_tuple_struct_borsh_skip2() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct G<K, V, U> (
HashMap<K, V>,
#[borsh(skip)]
U,
);
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn generic_named_fields_struct_borsh_skip() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct G<K, V, U> {
#[borsh(skip)]
x: HashMap<K, V>,
y: U,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn generic_deserialize_bound() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct C<T: Debug, U> {
a: String,
#[borsh(bound(deserialize =
"T: PartialOrd + Hash + Eq + borsh::de::BorshDeserialize,
U: borsh::de::BorshDeserialize"
))]
b: HashMap<T, U>,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn test_override_automatically_added_default_trait() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct G1<K, V, U>(
#[borsh(skip,bound(deserialize = ""))]
HashMap<K, V>,
U
);
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn check_deserialize_with_attr() {
let item_struct: ItemStruct = syn::parse2(quote! {
struct A<K: Ord, V> {
#[borsh(deserialize_with = "third_party_impl::deserialize_third_party")]
x: ThirdParty<K, V>,
y: u64,
}
})
.unwrap();
let actual = process(&item_struct, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
#[test]
fn borsh_init_func() {
let item_enum: ItemStruct = syn::parse2(quote! {
#[borsh(init=initialization_method)]
struct A {
x: u64,
y: String,
}
})
.unwrap();
let actual = process(&item_enum, default_cratename()).unwrap();
local_insta_assert_snapshot!(pretty_print_syn_str(&actual).unwrap());
}
}