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|
use proc_macro::TokenStream;
use quote::quote;
use syn::Ident;
use crate::get_global_set;
/// `pack_structural!` — like `pack!` but also marks the type as supporting
/// structured output via `StructuralData`.
pub(crate) fn pack_structural(input: TokenStream) -> TokenStream {
// Parse same input format as `pack!`
let input_parsed = syn::parse_macro_input!(input as PackStructuralInput);
let type_name = input_parsed.type_name;
let inner_type = input_parsed.inner_type;
let attrs = input_parsed.attrs;
let program_path = crate::default_program_path();
// Register in STRUCTURED_TYPES
let type_name_str = type_name.to_string();
get_global_set(&crate::STRUCTURED_TYPES)
.lock()
.unwrap()
.insert(type_name_str);
// Struct definition (with Serialize derive, same as pack! under structural_renderer)
#[cfg(not(feature = "structural_renderer"))]
let struct_def = quote! {
#(#attrs)*
pub struct #type_name {
pub inner: #inner_type,
}
};
#[cfg(feature = "structural_renderer")]
let struct_def = quote! {
#(#attrs)*
#[derive(serde::Serialize)]
pub struct #type_name {
pub inner: #inner_type,
}
};
// Helper impls (same as pack!)
let new_impl = quote! {
impl #type_name {
pub fn new(inner: #inner_type) -> Self {
Self { inner }
}
}
};
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
}
}
};
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
}
}
};
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
}
}
};
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);
};
// StructuralData impl + sealed + registration
let structural_impl = quote! {
impl ::mingling::__private::StructuralDataSealed<crate::ThisProgram> for #type_name {}
impl ::mingling::__private::StructuralData<crate::ThisProgram> for #type_name {}
};
let expanded = quote! {
#struct_def
#new_impl
#from_into_impl
#as_ref_impl
#deref_impl
#default_impl
#register_impl
#structural_impl
impl Into<::mingling::AnyOutput<#program_path>> for #type_name {
fn into(self) -> ::mingling::AnyOutput<#program_path> {
::mingling::AnyOutput::new(self)
}
}
impl Into<::mingling::ChainProcess<#program_path>> for #type_name {
fn into(self) -> ::mingling::ChainProcess<#program_path> {
::mingling::AnyOutput::new(self).route_chain()
}
}
/// SAFETY: This is an internal implementation of the `pack_structural!` macro,
/// guaranteeing that the enum value registered by the `register_type!` macro
/// is exactly the same as the actual return value,
/// which can be confirmed via the `Ident` in the `quote!` block.
unsafe impl ::mingling::Grouped<#program_path> for #type_name {
fn member_id() -> #program_path {
#program_path::#type_name
}
}
};
expanded.into()
}
/// Input for `pack_structural!` — same format as `pack!`.
struct PackStructuralInput {
attrs: Vec<syn::Attribute>,
type_name: Ident,
inner_type: syn::Type,
}
impl syn::parse::Parse for PackStructuralInput {
fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
let attrs = input.call(syn::Attribute::parse_outer)?;
let type_name: Ident = input.parse()?;
input.parse::<syn::Token![=]>()?;
let inner_type: syn::Type = input.parse()?;
Ok(PackStructuralInput {
attrs,
type_name,
inner_type,
})
}
}
|
