icydb-model-macros 0.284.0

Procedural macros for IcyDB application models
Documentation 
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//! Module: inner
//! Responsibility: generated `Inner` accessors for one-field wrappers.
//! Does not own: wrapper construction, validation, or storage semantics.
//! Boundary: emits borrowed and consuming accessors for validated newtypes.

use crate::helper_newtype::parse_newtype;
use proc_macro2::TokenStream;
use quote::quote;

pub(crate) fn derive_inner(input: TokenStream) -> TokenStream {
    let paths = &match crate::crate_path::CratePathOverrides::default().resolve() {
        Ok(paths) => paths,
        Err(error) => return error.write_errors(),
    };
    let model = &paths.model;
    let input = match parse_newtype(input, "Inner") {
        Ok(input) => input,
        Err(err) => return err.to_compile_error(),
    };

    let ident = &input.ident;
    let inner = &input.inner;
    let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();

    quote! {
        impl #impl_generics #model::Inner<#inner> for #ident #ty_generics #where_clause {
            fn inner(&self) -> &#inner {
                &self.0
            }

            fn into_inner(self) -> #inner {
                self.0
            }
        }
    }
}