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replace the storage tuple with a struct

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Tuples only implement Default up to arity 12.
This commit is contained in:
Niko Matsakis 2019-01-23 08:31:08 -05:00
parent 4f84f2a32e
commit af358ecdab
1 changed files with 37 additions and 6 deletions
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43
components/salsa-macros/src/database_storage.rs
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@ -1,4 +1,5 @@
use crate::parenthesized::Parenthesized;
use heck::SnakeCase;
use proc_macro::TokenStream;
use proc_macro2::Span;
use syn::parse::{Parse, ParseStream, Peek};
@ -29,17 +30,38 @@ pub(crate) fn database_storage(input: TokenStream) -> TokenStream {
} = syn::parse_macro_input!(input as DatabaseStorage);
let mut output = proc_macro2::TokenStream::new();
let query_group_names_camel: Vec<_> = query_groups
.iter()
.map(|query_group| {
let group_storage = query_group.query_group.clone();
group_storage.segments.last().unwrap().value().ident.clone()
})
.collect();
let query_group_names_snake: Vec<_> = query_group_names_camel
.iter()
.map(|query_group_name_camel| {
Ident::new(
&query_group_name_camel.to_string().to_snake_case(),
query_group_name_camel.span(),
)
})
.collect();
let each_query = || {
query_groups
.iter()
.enumerate()
.flat_map(|(index, query_group)| query_group.queries.iter().map(move |q| (index, q)))
.zip(&query_group_names_snake)
.flat_map(|(query_group, name_snake)| {
query_group.queries.iter().map(move |q| (name_snake, q))
})
};
// For each query group `foo::MyGroup` create a link to its
// `foo::MyGroupGroupStorage`
let mut storage_tuple_elements = proc_macro2::TokenStream::new();
for query_group in &query_groups {
let mut storage_fields = proc_macro2::TokenStream::new();
for (query_group, query_group_name_snake) in query_groups.iter().zip(&query_group_names_snake) {
// rewrite the last identifier (`MyGroup`, above) to
// (e.g.) `MyGroupGroupStorage`.
let mut group_storage = query_group.query_group.clone();
@ -49,7 +71,7 @@ pub(crate) fn database_storage(input: TokenStream) -> TokenStream {
Span::call_site(),
);
group_storage.segments.last_mut().unwrap().value_mut().ident = storage_ident;
storage_tuple_elements.extend(quote! { #group_storage<Self>, });
storage_fields.extend(quote! { #query_group_name_snake: #group_storage<#database_name>, });
}
let mut attrs = proc_macro2::TokenStream::new();
@ -57,6 +79,15 @@ pub(crate) fn database_storage(input: TokenStream) -> TokenStream {
attrs.extend(quote! { #attr });
}
// create group storage wrapper struct
output.extend(quote! {
#[derive(Default)]
#[doc(hidden)]
#visibility struct __SalsaDatabaseStorage {
#storage_fields
}
});
// create query descriptor wrapper struct
output.extend(quote! {
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
@ -95,7 +126,7 @@ pub(crate) fn database_storage(input: TokenStream) -> TokenStream {
output.extend(quote! {
impl ::salsa::plumbing::DatabaseStorageTypes for #database_name {
type QueryDescriptor = __SalsaQueryDescriptor;
type DatabaseStorage = (#storage_tuple_elements);
type DatabaseStorage = __SalsaDatabaseStorage;
}
});