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Change the id attribute to be a key value pair

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This commit is contained in:
Robbert van der Helm 2022-01-29 20:40:14 +01:00
parent 2a1fdb5d9f
commit 6fc4d80483
2 changed files with 25 additions and 24 deletions
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47
nih_plug_derive/src/lib.rs
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@ -37,32 +37,33 @@ pub fn derive_params(input: TokenStream) -> TokenStream {
// exclusive with this id attribute
let mut id_attr = None;
for attr in field.attrs {
match attr.parse_meta() {
Ok(syn::Meta::List(list)) if list.path.is_ident("id") => {
if id_attr.is_none() {
id_attr = Some(list);
} else {
return syn::Error::new(attr.span(), "Duplicate id attribute")
.to_compile_error()
.into();
if attr.path.is_ident("id") {
match attr.parse_meta() {
Ok(syn::Meta::NameValue(syn::MetaNameValue {
lit: syn::Lit::Str(s),
..
})) => {
if id_attr.is_none() {
id_attr = Some(s.value());
} else {
return syn::Error::new(attr.span(), "Duplicate id attribute")
.to_compile_error()
.into();
}
}
}
_ => (),
};
_ => {
return syn::Error::new(
attr.span(),
"The id attribute should be a key-value pair with a string argument: #[id = \"foo_bar\"]",
)
.to_compile_error()
.into()
}
};
}
}
if let Some(list) = id_attr {
let param_id =
match list.nested.first() {
Some(syn::NestedMeta::Lit(syn::Lit::Str(s))) => s.value(),
_ => return syn::Error::new(
list.span(),
"The id attribute should have a single string argument: #[id(\"foo_bar\")]",
)
.to_compile_error()
.into(),
};
if let Some(param_id) = id_attr {
// The specific parameter types know how to convert themselves into the correct ParamPtr
// variant
param_insert_tokens

2
plugins/gain/src/lib.rs
View file

@ -31,7 +31,7 @@ struct Gain {
#[derive(Params)]
struct GainParams {
#[id("gain")]
#[id = "gain"]
pub gain: FloatParam,
}