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style: Share more code between ToAnimatedValue and ToComputedValue derive.
I'm going to add a ToResolvedValue, and I don't want to add more copy-pasta. This shouldn't change behavior. Differential Revision: https://phabricator.services.mozilla.com/D26289
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3 changed files with 124 additions and 103 deletions
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@ -2,64 +2,42 @@
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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::{Span, TokenStream};
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use syn::{DeriveInput, Ident};
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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(mut input: DeriveInput) -> TokenStream {
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let mut where_clause = input.generics.where_clause.take();
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cg::propagate_clauses_to_output_type(
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&mut where_clause,
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&input.generics,
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parse_quote!(crate::values::animated::ToAnimatedValue),
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parse_quote!(AnimatedValue),
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);
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for param in input.generics.type_params() {
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cg::add_predicate(
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&mut where_clause,
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parse_quote!(#param: crate::values::animated::ToAnimatedValue),
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);
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}
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let to_body = cg::fmap_match(
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&input,
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BindStyle::Move,
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|binding| quote!(crate::values::animated::ToAnimatedValue::to_animated_value(#binding)),
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);
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let from_body = cg::fmap_match(
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&input,
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BindStyle::Move,
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|binding| quote!(crate::values::animated::ToAnimatedValue::from_animated_value(#binding)),
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);
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input.generics.where_clause = where_clause;
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let name = &input.ident;
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let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
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let animated_value_type = cg::fmap_trait_output(
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&input,
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&parse_quote!(crate::values::animated::ToAnimatedValue),
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Ident::new("AnimatedValue", Span::call_site()),
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);
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quote! {
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impl #impl_generics crate::values::animated::ToAnimatedValue for #name #ty_generics #where_clause {
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type AnimatedValue = #animated_value_type;
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#[allow(unused_variables)]
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#[inline]
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fn to_animated_value(self) -> Self::AnimatedValue {
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match self {
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#to_body
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}
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}
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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_animated_value(animated: Self::AnimatedValue) -> Self {
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match animated {
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#from_body
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}
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}
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}
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}
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#[inline]
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fn to_animated_value(self) -> Self::AnimatedValue {
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match self {
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#to_body
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}
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}
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}
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};
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// TODO(emilio): Consider optimizing away non-generic cases as well?
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let non_generic_implementation = || None;
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to_computed_value::derive_to_value(
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input,
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parse_quote!(crate::values::animated::ToAnimatedValue),
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parse_quote!(AnimatedValue),
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BindStyle::Move,
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|_| false,
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|binding| quote!(crate::values::animated::ToAnimatedValue::from_animated_value(#binding)),
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|binding| quote!(crate::values::animated::ToAnimatedValue::to_animated_value(#binding)),
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trait_impl,
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non_generic_implementation,
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)
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}
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