[FRAME] Remove V1 Module Syntax (#14685)

* Remove V1 pallet syntax Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Remove more Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * More... Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Move no_bound derives to own folder Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * fmt Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> * Keep re-exports Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> --------- Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
2026-07-16 21:15:43 +00:00 · 2023-07-31 18:49:39 +02:00
parent 49816ff4d9
commit 0853bbba72
22 changed files with 48 additions and 6418 deletions
@@ -0,0 +1,163 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// 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 proc_macro2::Span;
+use quote::{quote, quote_spanned};
+use syn::{spanned::Spanned, Data, DeriveInput, Fields};
+
+/// Derive Default but do not bound any generic.
+pub fn derive_default_no_bound(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+	let input = syn::parse_macro_input!(input as DeriveInput);
+
+	let name = &input.ident;
+
+	let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
+
+	let impl_ = match input.data {
+		Data::Struct(struct_) => match struct_.fields {
+			Fields::Named(named) => {
+				let fields = named.named.iter().map(|field| &field.ident).map(|ident| {
+					quote_spanned! {ident.span() =>
+						#ident: core::default::Default::default()
+					}
+				});
+
+				quote!(Self { #( #fields, )* })
+			},
+			Fields::Unnamed(unnamed) => {
+				let fields = unnamed.unnamed.iter().map(|field| {
+					quote_spanned! {field.span()=>
+						core::default::Default::default()
+					}
+				});
+
+				quote!(Self( #( #fields, )* ))
+			},
+			Fields::Unit => {
+				quote!(Self)
+			},
+		},
+		Data::Enum(enum_) => {
+			if enum_.variants.is_empty() {
+				return syn::Error::new_spanned(name, "cannot derive Default for an empty enum")
+					.to_compile_error()
+					.into()
+			}
+
+			// all #[default] attrs with the variant they're on; i.e. a var
+			let default_variants = enum_
+				.variants
+				.into_iter()
+				.filter(|variant| variant.attrs.iter().any(|attr| attr.path().is_ident("default")))
+				.collect::<Vec<_>>();
+
+			match &*default_variants {
+				[] => {
+					return syn::Error::new(
+						name.clone().span(),
+						// writing this as a regular string breaks rustfmt for some reason
+						r#"no default declared, make a variant default by placing `#[default]` above it"#,
+					)
+					.into_compile_error()
+					.into()
+				},
+				// only one variant with the #[default] attribute set
+				[default_variant] => {
+					let variant_attrs = default_variant
+						.attrs
+						.iter()
+						.filter(|a| a.path().is_ident("default"))
+						.collect::<Vec<_>>();
+
+					// check that there is only one #[default] attribute on the variant
+					if let [first_attr, second_attr, additional_attrs @ ..] = &*variant_attrs {
+						let mut err =
+							syn::Error::new(Span::call_site(), "multiple `#[default]` attributes");
+
+						err.combine(syn::Error::new_spanned(first_attr, "`#[default]` used here"));
+
+						err.extend([second_attr].into_iter().chain(additional_attrs).map(
+							|variant| {
+								syn::Error::new_spanned(variant, "`#[default]` used again here")
+							},
+						));
+
+						return err.into_compile_error().into()
+					}
+
+					let variant_ident = &default_variant.ident;
+
+					let fully_qualified_variant_path = quote!(Self::#variant_ident);
+
+					match &default_variant.fields {
+						Fields::Named(named) => {
+							let fields =
+								named.named.iter().map(|field| &field.ident).map(|ident| {
+									quote_spanned! {ident.span()=>
+										#ident: core::default::Default::default()
+									}
+								});
+
+							quote!(#fully_qualified_variant_path { #( #fields, )* })
+						},
+						Fields::Unnamed(unnamed) => {
+							let fields = unnamed.unnamed.iter().map(|field| {
+								quote_spanned! {field.span()=>
+									core::default::Default::default()
+								}
+							});
+
+							quote!(#fully_qualified_variant_path( #( #fields, )* ))
+						},
+						Fields::Unit => fully_qualified_variant_path,
+					}
+				},
+				[first, additional @ ..] => {
+					let mut err = syn::Error::new(Span::call_site(), "multiple declared defaults");
+
+					err.combine(syn::Error::new_spanned(first, "first default"));
+
+					err.extend(
+						additional
+							.into_iter()
+							.map(|variant| syn::Error::new_spanned(variant, "additional default")),
+					);
+
+					return err.into_compile_error().into()
+				},
+			}
+		},
+		Data::Union(union_) =>
+			return syn::Error::new_spanned(
+				union_.union_token,
+				"Union type not supported by `derive(DefaultNoBound)`",
+			)
+			.to_compile_error()
+			.into(),
+	};
+
+	quote!(
+		const _: () = {
+			impl #impl_generics core::default::Default for #name #ty_generics #where_clause {
+				fn default() -> Self {
+					#impl_
+				}
+			}
+		};
+	)
+	.into()
+}