From 472723016cbd23cdd2fb3376f90286996db3a744 Mon Sep 17 00:00:00 2001
From: testuser <test@example.com>
Date: Mon, 3 Feb 2025 19:55:05 +0900
Subject: [PATCH] update(generator): return error when block has multiple

---
 src/generator.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/generator.rs b/src/generator.rs
index 362e464..2ab6d5c 100644
--- a/src/generator.rs
+++ b/src/generator.rs
@@ -15,7 +15,6 @@ use crate::{
     types::{Block, Module, ModuleBlockElements, Register},
 };
 use heck::{ToSnakeCase, ToUpperCamelCase};
-use proc_macro2::TokenStream;
 use quote::quote;
 use thiserror::Error;
 
@@ -27,6 +26,8 @@ pub enum CodeGenError {
     FilePathError(String),
     #[error("parent is required for {module}")]
     ParentMissing { module: &'static str },
+    #[error("Unsupported structure: {}", name)]
+    UnsupportedStructure { name: &'static str },
 }
 
 mod util {
@@ -200,6 +201,12 @@ impl CodeGen for Block {
         parent_path: Option<path::PathBuf>,
         mut files: HashMap<path::PathBuf, proc_macro2::TokenStream>,
     ) -> Result<HashMap<path::PathBuf, proc_macro2::TokenStream>, CodeGenError> {
+        if self.multiple.is_some() {
+            // Plan: expand automatically, or same as register?
+            return Err(CodeGenError::UnsupportedStructure {
+                name: "multiple in block",
+            });
+        }
         let parent_name = parent_name.ok_or(CodeGenError::ParentMissing { module: "Block" })?;
         let parent_path = parent_path.ok_or(CodeGenError::ParentMissing { module: "Block" })?;