impl more ast

youknowone · youknowone · commit b6dfa84ff254 · 2025-12-12T20:43:04.000+09:00
diff --git a/crates/vm/src/stdlib/ast/pattern.rs b/crates/vm/src/stdlib/ast/pattern.rs
@@ -199,16 +199,31 @@ impl Node for ruff::PatternMatchSingleton {
 }
 
 impl Node for ruff::Singleton {
-    fn ast_to_object(self, _vm: &VirtualMachine, _source_file: &SourceFile) -> PyObjectRef {
-        todo!()
+    fn ast_to_object(self, vm: &VirtualMachine, _source_file: &SourceFile) -> PyObjectRef {
+        match self {
+            ruff::Singleton::None => vm.ctx.none(),
+            ruff::Singleton::True => vm.ctx.new_bool(true).into(),
+            ruff::Singleton::False => vm.ctx.new_bool(false).into(),
+        }
     }
 
     fn ast_from_object(
-        _vm: &VirtualMachine,
+        vm: &VirtualMachine,
         _source_file: &SourceFile,
-        _object: PyObjectRef,
+        object: PyObjectRef,
     ) -> PyResult<Self> {
-        todo!()
+        if vm.is_none(&object) {
+            Ok(ruff::Singleton::None)
+        } else if object.is(&vm.ctx.true_value) {
+            Ok(ruff::Singleton::True)
+        } else if object.is(&vm.ctx.false_value) {
+            Ok(ruff::Singleton::False)
+        } else {
+            Err(vm.new_value_error(format!(
+                "Expected None, True, or False, got {:?}",
+                object.class().name()
+            )))
+        }
     }
 }
 
