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a0d9f97c8e
This does not (yet) upgrade ./rust-toolchain The warnings: * dead_code "field is never read" * redundant_semicolons "unnecessary trailing semicolon" * non_fmt_panic "panic message is not a string literal, this is no longer accepted in Rust 2021" * unstable_name_collisions "a method with this name may be added to the standard library in the future" * legacy_derive_helpers "derive helper attribute is used before it is introduced" https://github.com/rust-lang/rust/issues/79202
52 lines
1.6 KiB
Rust
52 lines
1.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use derive_common::cg;
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use proc_macro2::TokenStream;
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use syn::DeriveInput;
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use synstructure::BindStyle;
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use to_computed_value;
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pub fn derive(input: DeriveInput) -> TokenStream {
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let trait_impl = |from_body, to_body| {
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quote! {
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#[inline]
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fn from_resolved_value(from: Self::ResolvedValue) -> Self {
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#from_body
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}
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#[inline]
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fn to_resolved_value(
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self,
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context: &crate::values::resolved::Context,
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) -> Self::ResolvedValue {
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#to_body
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}
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}
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};
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to_computed_value::derive_to_value(
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input,
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parse_quote!(crate::values::resolved::ToResolvedValue),
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parse_quote!(ResolvedValue),
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BindStyle::Move,
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|binding| {
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let attrs = cg::parse_field_attrs::<ResolvedValueAttrs>(&binding.ast());
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to_computed_value::ToValueAttrs {
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field_bound: attrs.field_bound,
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no_field_bound: attrs.no_field_bound,
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}
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},
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|binding| quote!(crate::values::resolved::ToResolvedValue::from_resolved_value(#binding)),
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|binding| quote!(crate::values::resolved::ToResolvedValue::to_resolved_value(#binding, context)),
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trait_impl,
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)
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}
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#[derive(Default, FromField)]
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#[darling(attributes(resolve), default)]
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struct ResolvedValueAttrs {
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field_bound: bool,
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no_field_bound: bool,
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}
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