Added skip_walk attribute.

Cargo.lock

@@ -22,14 +22,14 @@ dependencies = [
 
 [[package]]
 name = "rustructure"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "rustructure-macros",
 ]
 
 [[package]]
 name = "rustructure-macros"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -38,7 +38,7 @@ dependencies = [
 
 [[package]]
 name = "rustructure-test"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "rustructure",
 ]

rustructure-macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustructure-macros"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

rustructure-macros/src/lib.rs

@@ -1,7 +1,7 @@
 use proc_macro::{TokenStream};
 use quote::{quote};
 
-#[proc_macro_derive(Walkable)]
+#[proc_macro_derive(Walkable, attributes(skip_walk))]
 pub fn walkable(tokens: TokenStream) -> TokenStream {
     let input = syn::parse_macro_input!(tokens as syn::DeriveInput);
 
@@ -21,6 +21,8 @@ fn fields_walkable<'i, I: Iterator<Item = &'i syn::Field>>(input: I) -> proc_mac
     let mut index = 0;
     for field in input {
 
+        let skip = field.attrs.iter().any(|a| a.parse_meta().unwrap().path().is_ident("skip_walk"));
+
         let ident =
             if let Some(i) = &field.ident {
                 i.to_string()
@@ -30,9 +32,13 @@ fn fields_walkable<'i, I: Iterator<Item = &'i syn::Field>>(input: I) -> proc_mac
                 format!("{}", index-1)
             };
         
-
         let ty = &field.ty;
-        fields.push(quote!{ walker.visit_field::<#ty>(#ident) })
+        if skip {
+            fields.push(quote!{ walker.visit_skip_field(#ident) })
+        }
+        else {
+            fields.push(quote!{ walker.visit_field::<#ty>(#ident) })
+        }
     }
 
     quote!{ #(#fields);* }

rustructure-test/Cargo.toml

@@ -1,9 +1,9 @@
 [package]
 name = "rustructure-test"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rustructure = { path = "../rustructure", version = "0.1.0", features = ["std"] }
+rustructure = { path = "../rustructure", version = "0.1.1", features = ["std"] }

rustructure-test/src/main.rs

@@ -167,3 +167,23 @@ mod simple_nested {
         );
     }
 }
+
+#[cfg(test)]
+#[allow(dead_code)]
+mod skips {
+    use rustructure::{Walkable, StringWalker};
+
+    #[derive(Walkable)]
+    struct HoldSimpleType {
+        #[skip_walk]
+        v: u8
+    }
+
+    #[test]
+    fn skip_only_element() {
+        assert_eq!(
+            StringWalker::walk::<HoldSimpleType>(),
+            "(struct:HoldSimpleType (skip_field:v))".to_owned()
+        )
+    }
+}

rustructure/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustructure"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
@@ -10,5 +10,5 @@ default = ["std"]
 std = []
 
 [dependencies]
-rustructure-macros = { path = "../rustructure-macros", version = "0.1.0" }
+rustructure-macros = { path = "../rustructure-macros", version = "0.1.1" }
 

rustructure/src/lib.rs

@@ -28,10 +28,10 @@ pub trait Walker {
 
     fn visit_struct<W: Walkable>(&mut self, struct_name: &'static str);
     fn visit_field<W: Walkable>(&mut self, field_name: &'static str);
-
-    fn visit_variant<W: Walkable>(&mut self, variant_name: &'static str);
+    fn visit_skip_field(&mut self, field_name: &'static str);
 
     fn visit_enum<W: Walkable>(&mut self, enum_name: &'static str);
+    fn visit_variant<W: Walkable>(&mut self, variant_name: &'static str);
 }
 
 pub trait Walkable {
@@ -96,6 +96,10 @@ mod sw {
             self.buffer += ")";
         }
 
+        fn visit_skip_field(&mut self, field_name: &'static str) {
+            self.buffer += format!(" (skip_field:{})", field_name).as_str();
+        }
+
         fn visit_variant<W: Walkable>(&mut self, variant_name: &'static str) {
             self.buffer += format!(" (variant:{}", variant_name).as_str();
             W::walk_with(self);