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extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, Data, DeriveInput, Fields, Index};
#[proc_macro_derive(ReflectIntermediate)]
pub fn derive_reflect_intermediate(input: TokenStream) -> TokenStream {
let ast = parse_macro_input!(input as DeriveInput);
let name = &ast.ident;
let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
match ast.data {
Data::Struct(data) => match data.fields {
Fields::Named(fields) => {
let fields = fields.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
let key = name.to_string();
quote! {
#key => {
self.#name.patch_change(change);
}
}
}).collect::<Vec<_>>();
quote! {
impl #impl_generics serde_reflect_intermediate::ReflectIntermediate for #name #ty_generics #where_clause {
fn patch_change(&mut self, change: &Change) {
self.before_patch_change();
match change {
Change::Changed(v) => {
if let Ok(v) = serde_intermediate::from_intermediate(v) {
*self = v;
}
}
Change::PartialStruct(v) => {
for (name, change) in v {
match name.as_str() {
#( #fields )*
_ => {}
}
}
}
_ => {}
}
self.after_patch_change();
}
}
}.into()
}
Fields::Unnamed(fields) => {
let fields = fields.unnamed.iter().enumerate().map(|(index,_)| {
let tuple_index = Index::from(index);
quote! {
#index => {
self.#tuple_index.patch_change(change);
}
}
}).collect::<Vec<_>>();
quote! {
impl #impl_generics serde_reflect_intermediate::ReflectIntermediate for #name #ty_generics #where_clause {
fn patch_change(&mut self, change: &Change) {
self.before_patch_change();
match change {
Change::Changed(v) => {
if let Ok(v) = serde_intermediate::from_intermediate(v) {
*self = v;
}
}
Change::PartialSeq(v) => {
for (index, change) in v {
match *index {
#( #fields )*
_ => {}
}
}
}
_ => {}
}
self.after_patch_change();
}
}
}.into()
}
Fields::Unit => quote! {
impl #impl_generics serde_reflect_intermediate::ReflectIntermediate for #name #ty_generics #where_clause {}
}
.into(),
},
Data::Enum(data) => {
let new_type_variants = data.variants.iter().filter_map(|variant| {
let name = &variant.ident;
if let Fields::Unnamed(_) = &variant.fields {
if variant.fields.len() == 1 {
Some(quote! {
Self::#name(content) => {
content.patch_change(change);
}
})
} else {
None
}
} else {
None
}
}).collect::<Vec<_>>();
let struct_variants = data.variants.iter().filter_map(|variant| {
let name = &variant.ident;
if let Fields::Named(fields) = &variant.fields {
let field_names = fields
.named
.iter()
.map(|field| field.ident.as_ref().unwrap())
.collect::<Vec<_>>();
let fields = fields.named.iter().map(|field| {
let name = field.ident.as_ref().unwrap();
let key = name.to_string();
quote! {
#key => {
#name.patch_change(change);
}
}
}).collect::<Vec<_>>();
Some(quote! {
Self::#name { #( #field_names ),* } => {
for (name, change) in v {
match name.as_str() {
#( #fields )*
_ => {}
}
}
}
})
} else {
None
}
}).collect::<Vec<_>>();
quote! {
impl #impl_generics serde_reflect_intermediate::ReflectIntermediate for #name #ty_generics #where_clause {
fn patch_change(&mut self, change: &Change) {
self.before_patch_change();
match change {
Change::Changed(v) => {
if let Ok(v) = serde_intermediate::from_intermediate(v) {
*self = v;
}
}
Change::PartialChange(change) => {
match self {
#( #new_type_variants )*
_ => {}
}
}
Change::PartialStruct(v) => {
match self {
#( #struct_variants )*
_ => {}
}
}
_ => {}
}
self.after_patch_change();
}
}
}.into()
}
_ => panic!("ReflectIntermediate can be derived only for structs and enums"),
}
}