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make serde Serialize and Deserialize generation optional

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This commit is contained in:
Max Känner 2024-08-18 19:51:00 +02:00
parent 700e98917d
commit c5d46270b4
1 changed files with 26 additions and 9 deletions
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35
src/parser.rs
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@ -5,7 +5,7 @@ use std::convert::identity;
use convert_case::{Case, Casing}; use convert_case::{Case, Casing};
use darling::{ use darling::{
ast::{self, Data}, ast::{self, Data},
util::{Override, PathList}, util::{Flag, Override, PathList},
Error, FromDeriveInput, FromField, FromMeta, Error, FromDeriveInput, FromField, FromMeta,
}; };
use proc_macro2::{Span, TokenStream}; use proc_macro2::{Span, TokenStream};
@ -26,6 +26,7 @@ pub struct ConfigField {
typ: Option<syn::Type>, typ: Option<syn::Type>,
get: Option<syn::Path>, get: Option<syn::Path>,
set: Option<syn::Path>, set: Option<syn::Path>,
no_serde: Flag,
#[darling(skip)] #[darling(skip)]
description: Option<syn::Expr>, description: Option<syn::Expr>,
#[darling(skip)] #[darling(skip)]
@ -34,7 +35,7 @@ pub struct ConfigField {
impl ConfigField { impl ConfigField {
pub(crate) fn needs_newtype(&self) -> bool { pub(crate) fn needs_newtype(&self) -> bool {
self.helper_keys().len() > 1 self.helper_keys().len() > 1 || self.typ.is_some()
} }
pub(crate) fn helper(&self, attrs: &[syn::Attribute]) -> (Option<TokenStream>, syn::Type) { pub(crate) fn helper(&self, attrs: &[syn::Attribute]) -> (Option<TokenStream>, syn::Type) {
@ -170,7 +171,10 @@ impl ConfigField {
}) })
} }
pub(crate) fn helper_serde(&self) -> TokenStream { pub(crate) fn helper_serde(&self) -> Option<TokenStream> {
if self.no_serde.is_present() {
return None;
}
let ident = self.helper_ident(); let ident = self.helper_ident();
let conversion = if self.has_custom_limits() { let conversion = if self.has_custom_limits() {
quote! { quote! {
@ -184,7 +188,7 @@ impl ConfigField {
} }
}; };
let ty = &self.ty; let ty = &self.ty;
quote! { Some(quote! {
impl ::serde::Serialize for #ident { impl ::serde::Serialize for #ident {
fn serialize<S>(&self, serializer: S) -> ::core::result::Result::<S::Ok, S::Error> fn serialize<S>(&self, serializer: S) -> ::core::result::Result::<S::Ok, S::Error>
where where
@ -204,7 +208,7 @@ impl ConfigField {
#conversion #conversion
} }
} }
} })
} }
pub(crate) fn helper_tree(&self) -> TokenStream { pub(crate) fn helper_tree(&self) -> TokenStream {
@ -350,6 +354,13 @@ impl ConfigField {
.typ .typ
.as_ref() .as_ref()
.map_or_else(|| quote!(Self), |typ| quote!(#typ)); .map_or_else(|| quote!(Self), |typ| quote!(#typ));
let match_range = if num_keys > 1 {
Some(
quote!(1..=#num_keys => ::core::result::Result::Err(::miniconf::Traversal::Access(0, "Cannot write limits").into()),),
)
} else {
None
};
quote! { quote! {
impl<'de> ::miniconf::TreeDeserialize<'de, 1> for #ident { impl<'de> ::miniconf::TreeDeserialize<'de, 1> for #ident {
fn deserialize_by_key<K, D>( fn deserialize_by_key<K, D>(
@ -374,8 +385,7 @@ impl ConfigField {
#set(<#typ as ::serde::Deserialize>::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?)?; #set(<#typ as ::serde::Deserialize>::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?)?;
Ok(0) Ok(0)
} }
, #match_range
1..=#num_keys => ::core::result::Result::Err(::miniconf::Traversal::Access(0, "Cannot write limits").into()),
_ => unreachable!(), _ => unreachable!(),
} }
} }
@ -391,6 +401,13 @@ impl ConfigField {
} else { } else {
quote!(::core::result::Result::Ok(&mut *self)) quote!(::core::result::Result::Ok(&mut *self))
}; };
let match_range = if num_keys > 1 {
Some(
quote!(1..#num_keys => ::core::result::Result::Err(::miniconf::Traversal::Access(1, "cannot return reference to local variable")),),
)
} else {
None
};
quote! { quote! {
impl ::miniconf::TreeAny<1> for #ident { impl ::miniconf::TreeAny<1> for #ident {
fn ref_any_by_key<K>(&self, mut keys: K) -> ::core::result::Result<&dyn ::core::any::Any, ::miniconf::Traversal> fn ref_any_by_key<K>(&self, mut keys: K) -> ::core::result::Result<&dyn ::core::any::Any, ::miniconf::Traversal>
@ -406,7 +423,7 @@ impl ConfigField {
} }
match index { match index {
0 => ::core::result::Result::Ok(&*self), 0 => ::core::result::Result::Ok(&*self),
1..#num_keys => ::core::result::Result::Err(::miniconf::Traversal::Access(1, "cannot return reference to local variable")), #match_range
_ => unreachable!(), _ => unreachable!(),
} }
} }
@ -424,7 +441,7 @@ impl ConfigField {
} }
match index { match index {
0 => #ref_mut, 0 => #ref_mut,
1..#num_keys => ::core::result::Result::Err(::miniconf::Traversal::Access(1, "cannot return reference to local variable")), #match_range
_ => unreachable!(), _ => unreachable!(),
} }
} }