feat(zkvms): Add nexus guest and it's macro

2 files changed, 29 insertions, 0 deletions

diff --git a/zkvms/nexus/wrapper_macro/Cargo.toml b/zkvms/nexus/wrapper_macro/Cargo.toml
new file mode 100644
index 0000000..14348e5
--- /dev/null
+++ b/zkvms/nexus/wrapper_macro/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "wrapper_macro"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
diff --git a/zkvms/nexus/wrapper_macro/src/lib.rs b/zkvms/nexus/wrapper_macro/src/lib.rs
new file mode 100644
index 0000000..21bf1bb
--- /dev/null
+++ b/zkvms/nexus/wrapper_macro/src/lib.rs
@@ -0,0 +1,22 @@
+use proc_macro::TokenStream;
+
+#[path = "../../../../guests_macro/src/parse_fn.rs"]
+mod parse_fn;
+use crate::parse_fn::{ split_fn, args_split, args_divide, group_streams };
+
+#[proc_macro]
+pub fn make_wrapper(item: TokenStream) -> TokenStream {
+    let (name, args, ret) = split_fn(&item);
+
+    let (patterns, types) = args_divide(&args);
+    let ts_patterns = group_streams(&patterns);
+    let ts_types = group_streams(&types);
+
+    let mut out = TokenStream::new();
+    out.extend(format!("let {} = read_private_input::<{}>().unwrap();", ts_patterns, ts_types).parse::<TokenStream>());
+    out.extend(format!("write_output::<{}>(&zkp::{}{});", ret, name, ts_patterns).parse::<TokenStream>());
+
+    let mut block = TokenStream::new();
+    block.extend(format!("{{ {} }}", out).parse::<TokenStream>());
+    block
+}