1 files changed, 149 insertions, 0 deletions
diff --git a/mingling_macros/src/func/pack.rs b/mingling_macros/src/func/pack.rs
new file mode 100644
index 0000000..a1a7e6b
--- /dev/null
+++ b/mingling_macros/src/func/pack.rs
@@ -0,0 +1,149 @@
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::parse::{Parse, ParseStream};
+use syn::{Attribute, Ident, Result as SynResult, Token, Type};
+
+struct PackInput {
+    attrs: Vec<Attribute>,
+    type_name: Ident,
+    inner_type: Type,
+}
+
+impl Parse for PackInput {
+    fn parse(input: ParseStream) -> SynResult<Self> {
+        let attrs = input.call(Attribute::parse_outer)?;
+        let type_name: Ident = input.parse()?;
+        input.parse::<Token![=]>()?;
+        let inner_type: Type = input.parse()?;
+
+        Ok(PackInput {
+            attrs,
+            type_name,
+            inner_type,
+        })
+    }
+}
+
+#[allow(clippy::too_many_lines)]
+pub(crate) fn pack(input: TokenStream) -> TokenStream {
+    let pack_input = syn::parse_macro_input!(input as PackInput);
+
+    let group_name = crate::default_program_path();
+    let type_name = pack_input.type_name;
+    let inner_type = pack_input.inner_type;
+    let attrs = pack_input.attrs;
+
+    // Generate the struct definition
+    // Note: No longer derives Serialize under structural_renderer.
+    // Use pack_structual! for structured output support.
+    let struct_def = quote! {
+        #(#attrs)*
+        pub struct #type_name {
+            pub(crate) inner: #inner_type,
+        }
+    };
+
+    // Generate the new() method
+    let new_impl = quote! {
+        impl #type_name {
+            /// Creates a new instance of the wrapper type
+            pub fn new(inner: #inner_type) -> Self {
+                Self { inner }
+            }
+        }
+    };
+
+    // Generate From and Into implementations
+    let from_into_impl = quote! {
+        impl From<#inner_type> for #type_name {
+            fn from(inner: #inner_type) -> Self {
+                Self::new(inner)
+            }
+        }
+
+        impl From<#type_name> for #inner_type {
+            fn from(wrapper: #type_name) -> #inner_type {
+                wrapper.inner
+            }
+        }
+    };
+
+    // Generate AsRef and AsMut implementations
+    let as_ref_impl = quote! {
+        impl ::std::convert::AsRef<#inner_type> for #type_name {
+            fn as_ref(&self) -> &#inner_type {
+                &self.inner
+            }
+        }
+
+        impl ::std::convert::AsMut<#inner_type> for #type_name {
+            fn as_mut(&mut self) -> &mut #inner_type {
+                &mut self.inner
+            }
+        }
+    };
+
+    // Generate Deref and DerefMut implementations
+    let deref_impl = quote! {
+        impl ::std::ops::Deref for #type_name {
+            type Target = #inner_type;
+
+            fn deref(&self) -> &Self::Target {
+                &self.inner
+            }
+        }
+
+        impl ::std::ops::DerefMut for #type_name {
+            fn deref_mut(&mut self) -> &mut Self::Target {
+                &mut self.inner
+            }
+        }
+    };
+
+    // Check if the inner type implements Default by generating conditional code
+    let default_impl = quote! {
+        impl ::std::default::Default for #type_name
+        where
+            #inner_type: ::std::default::Default,
+        {
+            fn default() -> Self {
+                Self::new(::std::default::Default::default())
+            }
+        }
+    };
+
+    let register_impl = quote! {
+        ::mingling::macros::register_type!(#type_name);
+    };
+
+    let expanded = quote! {
+        #struct_def
+
+        #new_impl
+        #from_into_impl
+        #as_ref_impl
+        #deref_impl
+        #default_impl
+        #register_impl
+
+        impl Into<mingling::AnyOutput<#group_name>> for #type_name {
+            fn into(self) -> mingling::AnyOutput<#group_name> {
+                mingling::AnyOutput::new(self)
+            }
+        }
+
+        impl Into<mingling::ChainProcess<#group_name>> for #type_name {
+            fn into(self) -> mingling::ChainProcess<#group_name> {
+                mingling::AnyOutput::new(self).route_chain()
+            }
+        }
+
+        impl ::mingling::Grouped<#group_name> for #type_name {
+            fn member_id() -> #group_name {
+                #group_name::#type_name
+            }
+        }
+    };
+
+    expanded.into()
+}