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extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro_error::{emit_error, proc_macro_error};
use quote::quote;
use serde_query_core::DeriveTarget;
use syn::{parse_macro_input, DeriveInput};
fn set_dummy(input: &DeriveInput, target: DeriveTarget) {
let name = &input.ident;
let generics = &input.generics;
match target {
DeriveTarget::Deserialize => {
proc_macro_error::set_dummy(quote! {
const _: () = {
impl<'de> serde_query::__priv::serde::de::Deserialize<'de> for #name #generics {
fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error>
where
D: serde_query::__priv::serde::de::Deserializer<'de>
{
unimplemented!()
}
}
};
});
}
DeriveTarget::DeserializeQuery => {
proc_macro_error::set_dummy(quote! {
const _: () = {
struct __QueryWrapper;
impl<'de> serde_query::__priv::serde::de::Deserialize<'de> for __QueryWrapper {
fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error>
where
D: serde_query::__priv::serde::de::Deserializer<'de>
{
todo!()
}
}
impl core::convert::From<__QueryWrapper> for #name #generics {
fn from(val: __QueryWrapper) -> Self {
todo!()
}
}
impl core::ops::Deref for __QueryWrapper {
type Target = #name;
fn deref(&self) -> &Self::Target {
todo!()
}
}
impl core::ops::DerefMut for __QueryWrapper {
fn deref_mut(&mut self) -> &mut Self::Target {
todo!()
}
}
impl<'de> serde_query::DeserializeQuery<'de> for #name #generics {
type Query = __QueryWrapper;
}
};
});
}
}
}
fn generate_derive(input: TokenStream, target: DeriveTarget) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
set_dummy(&input, target);
if !input.generics.params.is_empty() {
emit_error!(input.generics, "generic arguments are not supported");
return TokenStream::new();
}
match serde_query_core::generate_derive(input, target) {
Ok(stream) => stream.into(),
Err(diagnostics) => {
for diagnostic in diagnostics {
diagnostic.emit();
}
TokenStream::new()
}
}
}
#[proc_macro_error]
#[proc_macro_derive(DeserializeQuery, attributes(query))]
pub fn derive_deserialize_query(input: TokenStream) -> TokenStream {
generate_derive(input, DeriveTarget::DeserializeQuery)
}
#[proc_macro_error]
#[proc_macro_derive(Deserialize, attributes(query))]
pub fn derive_deserialize(input: TokenStream) -> TokenStream {
generate_derive(input, DeriveTarget::Deserialize)
}