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Error out when fields have duplicate names

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This commit is contained in:
Robbert van der Helm 2022-02-12 19:36:31 +01:00
parent 693b618bc5
commit befe02cbc1
1 changed files with 23 additions and 0 deletions
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23
nih_plug_derive/src/lib.rs
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@ -2,6 +2,7 @@ extern crate proc_macro;
use proc_macro::TokenStream;
use quote::quote;
use std::collections::HashSet;
use syn::spanned::Spanned;
#[proc_macro_derive(Params, attributes(id, persist))]
@ -32,6 +33,10 @@ pub fn derive_params(input: TokenStream) -> TokenStream {
let mut param_id_string_tokens = Vec::new();
let mut field_serialize_tokens = Vec::new();
let mut field_deserialize_tokens = Vec::new();
// We'll also enforce that there are no duplicate keys at compile time
let mut param_ids = HashSet::new();
let mut persist_ids = HashSet::new();
for field in fields.named {
let field_name = match &field.ident {
Some(ident) => ident,
@ -93,6 +98,15 @@ pub fn derive_params(input: TokenStream) -> TokenStream {
match (id_attr, persist_attr) {
(Some(param_id), None) => {
if !param_ids.insert(param_id.clone()) {
return syn::Error::new(
field.span(),
"Multiple fields with the same parameter ID found",
)
.to_compile_error()
.into();
}
// The specific parameter types know how to convert themselves into the correct ParamPtr
// variant
param_mapping_insert_tokens
@ -100,6 +114,15 @@ pub fn derive_params(input: TokenStream) -> TokenStream {
param_id_string_tokens.push(quote! { #param_id, });
}
(None, Some(stable_name)) => {
if !persist_ids.insert(stable_name.clone()) {
return syn::Error::new(
field.span(),
"Multiple persisted fields with the same ID found",
)
.to_compile_error()
.into();
}
// We don't know anything about the field types, but because we can generate this
// function we get type erasure for free since we only need to worry about byte
// vectors