can run

src/lib.rs

@@ -10,39 +10,13 @@ use syn::parse_macro_input;
 
 use parse::Input;
 
-// #[proc_macro_attribute]
-// pub fn dsample(attr: TokenStream, item: TokenStream) -> TokenStream {
-//     println!("attr: \"{}\"", attr.to_string());
-//     println!("item: \"{}\"", item.to_string());
-//     item
-// }
-
-#[proc_macro_derive(Serialize_repr, attributes(dsample))]
+#[proc_macro_derive(TestDerive, attributes(dsample))]
 pub fn derive_serialize(input: TokenStream) -> TokenStream {
     let input = parse_macro_input!(input as Input);
-    println!("");
     println!("::::: {:?}", &input);
-    let ident = input.ident;
-    let repr = input.repr;
-
-    let match_variants = input.variants.iter().map(|variant| {
-        let variant = &variant.ident;
-        quote! {
-            #ident::#variant => #ident::#variant as #repr,
-        }
-    });
+    let _ident = input.ident;
 
     TokenStream::from(quote! {
         // println!("{}", #ident);
-        // impl serde::Serialize for #ident {
-        //     fn serialize<S>(&self, serializer: S) -> core::result::Result<S::Ok, S::Error>
-        //     where S: serde::Serializer
-        //     {
-        //         let value: #repr = match *self {
-        //             #(#match_variants)*
-        //         };
-        //         serde::Serialize::serialize(&value, serializer)
-        //     }
-        // }
     })
 }

src/parse.rs

@@ -1,13 +1,11 @@
 use proc_macro2::Span;
-use syn::parse::{Error, Parse, ParseStream, Parser, Result};
-use syn::{parenthesized, Data, DeriveInput, Fields, Ident, Meta, NestedMeta};
+use syn::parse::{Error, Parse, ParseStream, Result};
+use syn::{Lit, Data, DeriveInput, Fields, Ident, Meta, NestedMeta};
 
 #[derive(Debug)]
 pub struct Input {
     pub ident: Ident, // enum ident
-    pub repr: Ident,
     pub variants: Vec<Variant>,
-    pub default_variant: Option<Variant>,
 }
 
 #[derive(Clone, Debug)]
@@ -43,7 +41,8 @@ fn parse_attrs(variant: &syn::Variant) -> Result<VariantAttrs> {
             let meta = attr.parse_meta()?;
             if let Meta::List(value) = meta {
                 for meta in &value.nested {
-                    if let NestedMeta::Meta(Meta::Path(path)) = meta {
+                    if let NestedMeta::Meta(Meta::Path(_path)) = meta {
+                        // TODO ...
                         // if path.is_ident("other") {
                         //     attrs.is_default = true;
                         // }
@@ -99,36 +98,34 @@ impl Parse for Input {
 
         println!(">>>>>>>>>>>>>>>>>>");
 
-        let mut repr = None;
+        // get dsmple here
         for attr in derive_input.attrs {
             println!(">>>>>>> {:?}", &attr.tokens);
-            if attr.path.is_ident("repr") {
-                fn repr_arg(input: ParseStream) -> Result<Ident> {
-                    let content;
-                    parenthesized!(content in input);
-                    content.parse()
+            if attr.path.is_ident("dsample") {
+                match attr.parse_meta() {
+                    Ok(Meta::List(meta)) => {
+                        let list: Vec<NestedMeta> = meta.nested.into_iter().collect();
+                        for nested_meta in list.iter() {
+                            match nested_meta {
+                                NestedMeta::Meta(Meta::NameValue(nv)) => {
+                                    if let Lit::Str(lit) = &nv.lit {
+                                        if nv.path.is_ident("a") {
+                                            println!("------------------------------ a = {}", &lit.value());
+                                        }
+                                    }
+                                },
+                                _ => (),
+                            }
+                        }
+                    },
+                    _ => (),
                 }
-                let ty = repr_arg.parse2(attr.tokens)?;
-                repr = Some(ty);
-                break;
             }
         }
-        let repr = repr.ok_or_else(|| Error::new(call_site, "missing #[repr(...)] attribute"))?;
-
-        let mut default_variants = variants.iter().filter(|x| x.attrs.is_default);
-        let default_variant = default_variants.next().cloned();
-        if default_variants.next().is_some() {
-            return Err(Error::new(
-                call_site,
-                "only one variant can be #[serde(other)]",
-            ));
-        }
 
         Ok(Input {
             ident: derive_input.ident,
-            repr,
             variants,
-            default_variant,
         })
     }
 }

tests/test.rs

@@ -1,12 +1,9 @@
-use derive_sample::{Serialize_repr};
-// use derive_sample::dsample;
+use derive_sample::{TestDerive};
 
 mod small_prime {
     use super::*;
 
-    // #[dsample(name = "X")]
-    #[derive(Serialize_repr)]
-    #[repr(u8)]
+    #[derive(TestDerive)]
     #[dsample(a= "b")]
     enum SmallPrime {
         Two = 2,