refactor: 清除旧代码并展开 crate

crates/oxide_compiler/src/stmt/declaration/class_decl.rs

@@ -0,0 +1,30 @@
+use crate::compiler::{CompileCtx, Compiler};
+use oxide_bytecode::opcode::{self, OpCode};
+use oxide_parser::{Statement, VariableDeclarationKind};
+
+impl Compiler {
+    pub(crate) fn count_class_declaration(&self, class: &oxide_parser::Class<'_>, ctx: &mut CompileCtx) {
+        ctx.alloc_reg();
+        self.count_class(class, ctx);
+        ctx.projected_pc += 1;
+    }
+
+    pub(crate) fn emit_class_declaration_statement(
+        &self, stmt: &Statement, ctx: &mut CompileCtx,
+    ) -> Result<Option<u8>, String> {
+        let Statement::ClassDeclaration(class) = stmt else {
+            return Err("ClassDeclaration without name".into());
+        };
+        let name = class
+            .id
+            .as_ref()
+            .map(|id| id.name.to_string())
+            .ok_or_else(|| "ClassDeclaration without name".to_string())?;
+        let var_reg = ctx.alloc_reg();
+        ctx.declare(&name, var_reg, VariableDeclarationKind::Let, false)?;
+        ctx.init_var(&name);
+        let ctor_reg = self.emit_class(class, ctx)?;
+        ctx.emit(opcode::encode(OpCode::STORE_VAR, var_reg, ctor_reg, 0));
+        Ok(None)
+    }
+}