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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use derive_common::cg;
use proc_macro2::TokenStream;
use syn::DeriveInput;
use synstructure::BindStyle;
use to_computed_value;
pub fn derive(input: DeriveInput) -> TokenStream {
let trait_impl = |from_body, to_body| {
quote! {
#[inline]
fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
match resolved {
#from_body
}
}
#[inline]
fn to_resolved_value(
self,
context: &crate::values::resolved::Context,
) -> Self::ResolvedValue {
match self {
#to_body
}
}
}
};
let non_generic_implementation = || {
Some(quote! {
type ResolvedValue = Self;
#[inline]
fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
resolved
}
#[inline]
fn to_resolved_value(
self,
context: &crate::values::resolved::Context,
) -> Self {
self
}
})
};
to_computed_value::derive_to_value(
input,
parse_quote!(crate::values::resolved::ToResolvedValue),
parse_quote!(ResolvedValue),
BindStyle::Move,
|binding| cg::parse_field_attrs::<ResolvedValueAttrs>(&binding.ast()).field_bound,
|binding| quote!(crate::values::resolved::ToResolvedValue::from_resolved_value(#binding)),
|binding| quote!(crate::values::resolved::ToResolvedValue::to_resolved_value(#binding, context)),
trait_impl,
non_generic_implementation,
)
}
#[darling(attributes(resolve), default)]
#[derive(Default, FromField)]
struct ResolvedValueAttrs {
field_bound: bool,
}
|
