/
storage_item.rs
249 lines (224 loc) · 6.9 KB
/
storage_item.rs
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// Copyright 2018-2022 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::GenerateCode;
use derive_more::From;
use proc_macro2::{
Ident,
TokenStream as TokenStream2,
TokenStream,
};
use quote::{
format_ident,
quote,
quote_spanned,
ToTokens,
};
use syn::{
spanned::Spanned,
Data,
DataEnum,
DataStruct,
DataUnion,
Field,
Fields,
Type,
};
/// Generates code for the storage item.
#[derive(From, Copy, Clone)]
pub struct StorageItem<'a> {
/// The storage item to generate code for.
item: &'a ir::StorageItem,
}
impl GenerateCode for StorageItem<'_> {
/// Generates ink! storage item code.
fn generate_code(&self) -> TokenStream2 {
let attrs = self.item.attrs();
let generated_struct = match self.item.data().clone() {
Data::Struct(struct_item) => self.generate_struct(struct_item),
Data::Enum(enum_item) => self.generate_enum(enum_item),
Data::Union(union_item) => self.generate_union(union_item),
};
let mut derive = quote! {};
if self.item.config().derive() {
derive = quote! {
#[cfg_attr(feature = "std", derive(
::scale_info::TypeInfo,
::ink::storage::traits::StorageLayout,
))]
#[derive(
::ink::storage::traits::StorableHint,
::ink::storage::traits::StorageKey,
::ink::storage::traits::Storable,
)]
};
}
let type_check = self.generate_type_check();
quote! {
#type_check
#(#attrs)*
#derive
#generated_struct
}
}
}
impl<'a> StorageItem<'a> {
fn generate_struct(&self, struct_item: DataStruct) -> TokenStream2 {
let item = self.item;
let struct_ident = item.ident();
let vis = item.vis();
let generics = item.generics();
let salt = item.salt();
let fields = struct_item.fields.iter().enumerate().map(|(i, field)| {
convert_into_storage_field(struct_ident, None, &salt, i, field)
});
match struct_item.fields {
Fields::Unnamed(_) => {
quote! {
#vis struct #struct_ident #generics (
#(#fields),*
);
}
}
_ => {
quote! {
#vis struct #struct_ident #generics {
#(#fields),*
}
}
}
}
}
fn generate_enum(&self, enum_item: DataEnum) -> TokenStream2 {
let item = self.item;
let enum_ident = item.ident();
let vis = item.vis();
let generics = item.generics();
let salt = item.salt();
let variants = enum_item.variants.into_iter().map(|variant| {
let attrs = variant.attrs;
let variant_ident = &variant.ident;
let discriminant = if let Some((eq, expr)) = variant.discriminant {
quote! { #eq #expr}
} else {
quote! {}
};
let fields: Vec<_> = variant
.fields
.iter()
.enumerate()
.map(|(i, field)| {
convert_into_storage_field(
enum_ident,
Some(variant_ident),
&salt,
i,
field,
)
})
.collect();
let fields = match variant.fields {
Fields::Named(_) => quote! { { #(#fields),* } },
Fields::Unnamed(_) => quote! { ( #(#fields),* ) },
Fields::Unit => quote! {},
};
quote! {
#(#attrs)*
#variant_ident #fields #discriminant
}
});
quote! {
#vis enum #enum_ident #generics {
#(#variants),*
}
}
}
fn generate_union(&self, union_item: DataUnion) -> TokenStream2 {
let item = self.item;
let union_ident = item.ident();
let vis = item.vis();
let generics = item.generics();
let salt = item.salt();
let fields = union_item
.fields
.named
.iter()
.enumerate()
.map(|(i, field)| {
convert_into_storage_field(union_ident, None, &salt, i, field)
});
quote! {
#vis union #union_ident #generics {
#(#fields),*
}
}
}
fn generate_type_check(&self) -> TokenStream2 {
let fields = self
.item
.all_used_types()
.into_iter()
.enumerate()
.map(|(i, ty)| {
let field_name = format_ident!("field_{}", i);
let span = ty.span();
quote_spanned!(span =>
#field_name: #ty
)
});
let generics = self.item.generics();
let salt = self.item.salt();
quote! {
const _: () = {
struct Check #generics {
salt: #salt,
#(#fields),*
}
};
}
}
}
fn convert_into_storage_field(
struct_ident: &Ident,
variant_ident: Option<&syn::Ident>,
salt: &TokenStream,
index: usize,
field: &Field,
) -> Field {
let field_name = if let Some(field_ident) = &field.ident {
field_ident.to_string()
} else {
index.to_string()
};
let variant_name = if let Some(variant_ident) = variant_ident {
variant_ident.to_string()
} else {
"".to_string()
};
let key = ink_primitives::KeyComposer::compute_key(
struct_ident.to_string().as_str(),
variant_name.as_str(),
field_name.as_str(),
)
.expect("unable to compute the storage key for the field");
let mut new_field = field.clone();
let ty = field.ty.clone().to_token_stream();
let span = field.ty.span();
let new_ty = Type::Verbatim(quote_spanned!(span =>
<#ty as ::ink::storage::traits::AutoStorableHint<
::ink::storage::traits::ManualKey<#key, #salt>,
>>::Type
));
new_field.ty = new_ty;
new_field
}