use convert_case::{Case, Casing};use proc_macro::TokenStream;use quote::quote;use syn::{DeriveInput, Lit, Meta, MetaList, MetaNameValue, NestedMeta, parse_macro_input}; pub fn derive_into_component(input: TokenStream) -> TokenStream { let input = parse_macro_input!(input as DeriveInput); let mut scope_val = None; let mut description_val = None; for attr in &input.attrs { if attr.path.is_ident("component") { if let Ok(Meta::List(MetaList { nested, .. })) = attr.parse_meta() { for item in nested { if let NestedMeta::Meta(Meta::NameValue(MetaNameValue { path, lit: Lit::Str(s), .. })) = item { let ident = path.get_ident().map(|i| i.to_string()).unwrap_or_default(); if ident == "scope" { scope_val = Some(s.value()); } else if ident == "description" { description_val = Some(s.value()); } } } } } } let name = &input.ident; let scope_impl = if let Some(s) = scope_val { let scope_str = s.clone(); quote! { fn scope() -> Option<component::ComponentScope> { Some(component::ComponentScope::from(#scope_str)) } } } else { quote! { fn scope() -> Option<component::ComponentScope> { None } } }; let description_impl = if let Some(desc) = description_val { quote! { fn description() -> Option<&'static str> { Some(#desc) } } } else { quote! {} }; let register_component_name = syn::Ident::new( &format!( "__register_component_{}", Casing::to_case(&name.to_string(), Case::Snake) ), name.span(), ); let register_preview_name = syn::Ident::new( &format!( "__register_preview_{}", Casing::to_case(&name.to_string(), Case::Snake) ), name.span(), ); let expanded = quote! { impl component::Component for #name { #scope_impl fn name() -> &'static str { stringify!(#name) } #description_impl } #[linkme::distributed_slice(component::__ALL_COMPONENTS)] fn #register_component_name() { component::register_component::<#name>(); } #[linkme::distributed_slice(component::__ALL_PREVIEWS)] fn #register_preview_name() { component::register_preview::<#name>(); } }; expanded.into()}
use convert_case::{Case, Casing};
use proc_macro::TokenStream;
use quote::quote;
use syn::{DeriveInput, Lit, Meta, MetaList, MetaNameValue, NestedMeta, parse_macro_input};
pub fn derive_into_component(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let mut scope_val = None;
let mut description_val = None;
for attr in &input.attrs {
if attr.path.is_ident("component") {
if let Ok(Meta::List(MetaList { nested, .. })) = attr.parse_meta() {
for item in nested {
if let NestedMeta::Meta(Meta::NameValue(MetaNameValue {
path,
lit: Lit::Str(s),
..
})) = item
{
let ident = path.get_ident().map(|i| i.to_string()).unwrap_or_default();
if ident == "scope" {
scope_val = Some(s.value());
} else if ident == "description" {
description_val = Some(s.value());
}
}
}
}
}
}
let name = &input.ident;
let scope_impl = if let Some(s) = scope_val {
let scope_str = s.clone();
quote! {
fn scope() -> Option<component::ComponentScope> {
Some(component::ComponentScope::from(#scope_str))
}
}
} else {
quote! {
fn scope() -> Option<component::ComponentScope> {
None
}
}
};
let description_impl = if let Some(desc) = description_val {
quote! {
fn description() -> Option<&'static str> {
Some(#desc)
}
}
} else {
quote! {}
};
let register_component_name = syn::Ident::new(
&format!(
"__register_component_{}",
Casing::to_case(&name.to_string(), Case::Snake)
),
name.span(),
);
let register_preview_name = syn::Ident::new(
&format!(
"__register_preview_{}",
Casing::to_case(&name.to_string(), Case::Snake)
),
name.span(),
);
let expanded = quote! {
impl component::Component for #name {
#scope_impl
fn name() -> &'static str {
stringify!(#name)
}
#description_impl
}
#[linkme::distributed_slice(component::__ALL_COMPONENTS)]
fn #register_component_name() {
component::register_component::<#name>();
}
#[linkme::distributed_slice(component::__ALL_PREVIEWS)]
fn #register_preview_name() {
component::register_preview::<#name>();
}
};
expanded.into()
}