feat(secure): add RmcSerialize macro for convenience serializing structs

macros/src/lib.rs

@@ -0,0 +1,185 @@
+extern crate proc_macro;
+
+use proc_macro2::TokenTree;
+use quote::__private::ext::RepToTokensExt;
+use proc_macro::TokenStream;
+
+use syn::{parse_macro_input, DeriveInput, Data};
+use quote::{quote, TokenStreamExt};
+
+
+/// Example of user-defined [derive mode macro][1]
+///
+/// [1]: https://doc.rust-lang.org/reference/procedural-macros.html#derive-mode-macros
+#[proc_macro_derive(RmcSerialize, attributes(extends, rmc_struct))]
+pub fn rmc_serialize(input: TokenStream) -> TokenStream {
+    let derive_input = parse_macro_input!(input as DeriveInput);
+
+    let struct_attr = derive_input.attrs.iter()
+        .find(|a| a.path.segments.len() == 1 &&
+            a.path.segments.first().is_some_and(|p| p.ident.to_string() == "rmc_struct"));
+
+    let Data::Struct(s) = derive_input.data else {
+        panic!("rmc struct type MUST be a struct");
+    };
+
+    /// generate base data
+
+    let serialize_base_content = {
+        let mut serialize_content = quote! {};
+
+        for f in &s.fields{
+            if f.attrs.iter()
+                .any(|a| a.path.segments.len() == 1 &&
+                    a.path.segments.first().is_some_and(|p| p.ident.to_string() == "extends")){
+                continue;
+            }
+            let ident = f.ident.as_ref().unwrap();
+
+            serialize_content.append_all(quote!{
+                self.#ident.serialize(writer)?;
+            })
+        }
+
+        quote!{
+            #serialize_content
+
+            Ok(())
+        }
+    };
+
+    let struct_ctor = {
+        let mut structure_content = quote! {};
+        for f in &s.fields {
+            let ident = f.ident.as_ref().unwrap();
+
+            structure_content.append_all(quote!{#ident, });
+        }
+
+        quote!{
+            Ok(Self{
+                #structure_content
+            })
+        }
+    };
+
+    let deserialize_base_content = {
+        let mut deserialize_content = quote! {};
+
+        for f in &s.fields{
+            if f.attrs.iter()
+                .any(|a| a.path.segments.len() == 1 &&
+                    a.path.segments.first().is_some_and(|p| p.ident.to_string() == "extends")){
+                continue;
+            }
+
+            let ident = f.ident.as_ref().unwrap();
+            let ty = &f.ty;
+
+            deserialize_content.append_all(quote!{
+                let #ident = <#ty> :: deserialize(reader)?;
+            })
+        }
+
+        quote!{
+            #deserialize_content
+            #struct_ctor
+        }
+    };
+
+    /// generate base with extends stuff
+
+    let serialize_base_content = if let Some(attr) = struct_attr{
+        let tokens = attr.tokens.clone();
+        let token = tokens.into_iter().next().unwrap();
+
+        let version = match token {
+            TokenTree::Group(g) => {
+                match g.stream().into_iter().next().unwrap(){
+                    TokenTree::Literal(l) => l,
+                    _ => panic!("expected literal")
+                }
+            },
+            _ => panic!("expected group")
+        };
+
+        let pre_inner = if let Some(f) = s.fields.iter().find(|f| {
+            f.attrs.iter()
+                .any(|a| a.path.segments.len() == 1 &&
+                    a.path.segments.first().is_some_and(|p| p.ident.to_string() == "extends"))
+        }){
+            let ident= f.ident.as_ref().unwrap();
+            quote! {
+                self.#ident.serialize(writer)?;
+            }
+        } else {
+            quote! {}
+        };
+
+        quote! {
+            #pre_inner
+            crate::rmc::structures::rmc_struct::write_struct(writer, #version, |mut writer|{
+                #serialize_base_content
+            })?;
+
+            Ok(())
+        }
+    } else {
+        serialize_base_content
+    };
+
+    let deserialize_base_content = if let Some(attr) = struct_attr{
+        let tokens = attr.tokens.clone();
+        let token = tokens.into_iter().next().unwrap();
+
+        let version = match token {
+            TokenTree::Group(g) => {
+                match g.stream().into_iter().next().unwrap(){
+                    TokenTree::Literal(l) => l,
+                    _ => panic!("expected literal")
+                }
+            },
+            _ => panic!("expected group")
+        };
+        let pre_inner = if let Some(f) = s.fields.iter().find(|f| {
+            f.attrs.iter()
+                .any(|a| a.path.segments.len() == 1 &&
+                    a.path.segments.first().is_some_and(|p| p.ident.to_string() == "extends"))
+        }){
+            let ident= f.ident.as_ref().unwrap();
+            let ty= &f.ty;
+            quote! {
+                let #ident = <#ty> :: deserialize(reader)?;
+            }
+        } else {
+            quote! {}
+        };
+
+        quote! {
+            #pre_inner
+            Ok(crate::rmc::structures::rmc_struct::read_struct(reader, #version, move |mut reader|{
+                #deserialize_base_content
+            })?)
+        }
+    } else {
+        deserialize_base_content
+    };
+
+    let ident = derive_input.ident;
+
+    let tokens = quote! {
+        impl crate::rmc::structures::RmcSerialize for #ident{
+            fn serialize(&self, writer: &mut dyn ::std::io::Write) -> crate::rmc::structures::Result<()>{
+                #serialize_base_content
+
+
+            }
+
+            fn deserialize(reader: &mut dyn ::std::io::Read) -> crate::rmc::structures::Result<Self>{
+                #deserialize_base_content
+            }
+        }
+    };
+
+    tokens.into()
+}