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Generics are now supported in Macros
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| use std::collections::hash_map::DefaultHasher; | ||
| use std::hash::Hash; | ||
| use digestible::Digestible; | ||
|
|
||
| #[derive(Digestible)] | ||
| #[digestible(hash = LittleEndian)] | ||
| pub struct MyStructGenerics<T> { | ||
| pub id: u32, | ||
| pub t: T, | ||
| } | ||
| #[derive(Digestible)] | ||
| pub struct MyStructGenericsAlreadyRequired<T: Digestible> { | ||
| pub id: u32, | ||
| pub t: T, | ||
| } | ||
|
|
||
| #[test] | ||
| pub fn hash_test() { | ||
| let test = MyStructGenerics { | ||
| id: 0, | ||
| t: "Test".to_string(), | ||
| }; | ||
| let mut default_hasher = DefaultHasher::new(); | ||
| test.hash(&mut default_hasher); | ||
| } | ||
|
|
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|
|
||
| #[derive(Digestible)] | ||
| pub enum MyEnum<T> { | ||
| A(T), | ||
| B(u32), | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| use proc_macro2::{Ident, TokenStream}; | ||
| use syn::{GenericParam, Generics, ImplGenerics, parse_quote, Path, TypeGenerics, WhereClause}; | ||
|
|
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| pub fn digestible_path() -> Path { | ||
| parse_quote!(_digestible::Digestible) | ||
| } | ||
| pub fn digest_writer() -> Path { | ||
| parse_quote!(_digestible::DigestWriter) | ||
| } | ||
| pub fn digest_with_path(path: Path) -> Path { | ||
| parse_quote!(_digestible::digest_with::#path) | ||
| } | ||
| pub fn digester_using_hasher() -> Path { | ||
| parse_quote!(_digestible::hash_digester::DigesterUsingHasher) | ||
| } | ||
|
|
||
| pub fn byte_order_path() -> Path { | ||
| parse_quote!(_digestible::byteorder::ByteOrder) | ||
| } | ||
| pub fn byte_order_impl_path(ident: Ident) -> Path { | ||
| parse_quote!(_digestible::byteorder::#ident) | ||
| } | ||
|
|
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| macro_rules! private_path { | ||
| // `()` indicates that the macro takes no argument. | ||
| ($key:ident) => { | ||
| syn::parse_quote!(_digestible::_private::$key) | ||
| }; | ||
| } | ||
| pub(crate) use private_path; | ||
|
|
||
| pub fn add_digestible_trait(generics: &mut Generics) { | ||
| if generics.params.is_empty() { | ||
| return; | ||
| } | ||
| for param in &mut generics.params { | ||
| if let GenericParam::Type(ty) = param { | ||
| ty.bounds.push(parse_quote!(_digestible::Digestible)); | ||
| } | ||
| } | ||
| } | ||
|
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||
| use quote::quote; | ||
|
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| /// Implements `Hash` for the container. | ||
| /// Using Digestible | ||
| pub fn impl_hash(container: &Ident, endian_path: Path, impl_generics: &ImplGenerics, ty_generics: &TypeGenerics, where_clause: &Option<&WhereClause>) -> TokenStream { | ||
| let digester_using_hasher = digester_using_hasher(); | ||
| let digestible_path = digestible_path(); | ||
| let hash: Path = private_path!(Hash); | ||
| let hasher: Path = private_path!(Hasher); | ||
| quote! { | ||
| #[automatically_derived] | ||
| impl #impl_generics #hash for #container #ty_generics #where_clause { | ||
| fn hash<H: #hasher>(&self, state: &mut H) { | ||
| let mut digester = #digester_using_hasher(state); | ||
| <Self as #digestible_path>::digest::<#endian_path, _>(self,&mut digester); | ||
| } | ||
| } | ||
| } | ||
| } |