59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
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use darling::FromMeta;
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use proc_macro::TokenStream;
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use syn::{parse_macro_input, ItemImpl};
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extern crate proc_macro;
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mod args {
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use darling::FromMeta;
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#[derive(FromMeta, Default)]
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#[darling(default)]
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pub struct Object {}
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}
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mod actions {
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use proc_macro::TokenStream;
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use syn::ItemImpl;
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use crate::{args, utils::GeneratorResult};
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pub fn generate(
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object_args: &args::Object,
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item_impl: &mut ItemImpl,
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) -> GeneratorResult<TokenStream> {
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todo!()
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}
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}
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mod utils {
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pub type GeneratorResult<T> = std::result::Result<T, syn::Error>;
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}
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macro_rules! parse_nested_meta {
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($ty:ty, $args:expr) => {{
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let meta = match darling::ast::NestedMeta::parse_meta_list(proc_macro2::TokenStream::from(
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$args,
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)) {
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Ok(v) => v,
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Err(e) => {
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return TokenStream::from(darling::Error::from(e).write_errors());
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}
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};
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match <$ty>::from_list(&meta) {
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Ok(object_args) => object_args,
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Err(err) => return TokenStream::from(err.write_errors()),
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}
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}};
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}
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#[proc_macro_attribute]
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#[allow(non_snake_case)]
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pub fn Actions(args: TokenStream, input: TokenStream) -> TokenStream {
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let object_args = parse_nested_meta!(args::Object, args);
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let mut item_impl = parse_macro_input!(input as ItemImpl);
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match actions::generate(&object_args, &mut item_impl) {
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Ok(expanded) => expanded,
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Err(err) => err.to_compile_error().into(),
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}
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}
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