//! 模块命名空间 @@toStringTag Symbol 键与自身键枚举口径: //! 命名空间标签以 well-known symbol 键写入,`Reflect.ownKeys` 的 Symbol 段跟在 //! 字符串段之后,字符串枚举面(getOwnPropertyNames / Object.keys)不受污染。 use std::sync::Arc; use oxide_compiler::compiler::Compiler; use oxide_emit::module::{ModuleKind, ModuleSourceLoader, ResolvedModule}; use oxide_vm::vm::Vm; /// 文件加载器:base_dir/specifier join 后读源(依赖模块经真实文件解析)。 struct FileLoader; impl ModuleSourceLoader for FileLoader { fn resolve( &mut self, base_dir: &str, specifier: &str, _attributes: &[(&str, &str)], ) -> Result { let joined = std::path::Path::new(base_dir).join(specifier); // 解析为规范绝对路径:自导入身份比较要求 loader 的 path 与入口模块的 // 规范路径逐字对齐(emit 侧入口路径已 canonicalize)。 let full = std::fs::canonicalize(&joined).map_err(|e| format!("cannot read {specifier}: {e}"))?; let source = std::fs::read_to_string(&full).map_err(|e| format!("cannot read {specifier}: {e}"))?; Ok(ResolvedModule { source, path: full.to_string_lossy().into_owned(), kind: ModuleKind::Js, }) } } /// 测试结束删除临时目录,避免在 crate 树残留文件。 struct Cleanup(std::path::PathBuf); impl Drop for Cleanup { fn drop(&mut self) { let _ = std::fs::remove_dir_all(&self.0); } } /// 同一 VM 续跑脚本并返回字符串完成值(读 global 探针用)。 fn probe_str(vm: &mut Vm, source: &str) -> String { let allocator = oxide_parser::Allocator::default(); let program = oxide_parser::parse(&allocator, source).expect("parse"); let module = Compiler::new().compile(&program).expect("compile"); let value = vm.run(&Arc::new(module)).expect("probe run"); vm.lookup_str(value).unwrap_or_default() } /// 编译并运行带依赖的模块,返回其探针字符串。 fn run_namespace_module(dir: &std::path::Path) -> String { let allocator = oxide_parser::Allocator::default(); let source = std::fs::read_to_string(dir.join("main.mjs")).expect("read main"); let program = oxide_parser::parse_module(&allocator, &source).expect("parse module"); let module = Compiler::new() .compile_module(&program, dir.join("main.mjs").to_string_lossy().as_ref(), &mut FileLoader) .expect("compile module"); let mut vm = Vm::new(); vm.run(&Arc::new(module)).expect("module run"); probe_str(&mut vm, "globalThis.__ns") } #[test] fn namespace_to_string_tag_symbol_key_and_own_keys() { // 命名空间标签按 Symbol.toStringTag Symbol 键暴露:描述符值/属性正确, // 字符串导出按 UTF-16 单元序排序,Symbol 段排在字符串段之后, // 字符串枚举面不含标签。 let cwd = std::env::current_dir().expect("cwd"); let dir = cwd.join("__module_namespace__"); std::fs::create_dir_all(&dir).expect("mkdir"); std::fs::write(dir.join("dep.mjs"), "export const b = 1;\nexport const a = 2;\nexport default 3;") .expect("write dep"); std::fs::write( dir.join("main.mjs"), "import * as ns from './dep.mjs';\n \ var desc = Object.getOwnPropertyDescriptor(ns, Symbol.toStringTag);\n \ globalThis.__ns = [\n \ ns[Symbol.toStringTag],\n \ typeof ns[Symbol.toStringTag],\n \ Object.prototype.toString.call(ns),\n \ Object.getOwnPropertySymbols(ns).length,\n \ Object.getOwnPropertySymbols(ns)[0] === Symbol.toStringTag,\n \ Object.getOwnPropertyNames(ns).length,\n \ Object.getOwnPropertyNames(ns).join(','),\n \ Reflect.ownKeys(ns).length,\n \ Reflect.ownKeys(ns).indexOf(Symbol.toStringTag),\n \ Symbol.toStringTag in ns,\n \ Reflect.has(ns, Symbol.toStringTag),\n \ Object.prototype.hasOwnProperty.call(ns, Symbol.toStringTag),\n \ desc.writable,\n \ desc.enumerable,\n \ desc.configurable,\n \ Object.getOwnPropertyNames(ns).indexOf('@@toStringTag'),\n \ Object.keys(ns).length,\n \ ].join('|');", ) .expect("write main"); let _cleanup = Cleanup(dir.clone()); let result = run_namespace_module(&dir); assert_eq!( result, "Module|string|[object Module]|1|true|3|a,b,default|4|3|true|true|true|false|false|false|-1|3", "命名空间标签 Symbol 键与自身键枚举面不符" ); } #[test] fn namespace_exotic_semantics() { // 模块命名空间 exotic 四语义:创建起不可扩展、导出 writable:true、 // [[Set]] 恒 false、[[DefineOwnProperty]] 收窄、Object.freeze 恒抛。 // 用自导入在 body 内观测扩展性(此时 body 尚未执行到 seal)。 let cwd = std::env::current_dir().expect("cwd"); let dir = cwd.join("__module_namespace_exotic__"); std::fs::create_dir_all(&dir).expect("mkdir"); std::fs::write( dir.join("main.mjs"), "import * as ns from './main.mjs';\n \ export const x = 1;\n \ export default 2;\n \ const d = Object.getOwnPropertyDescriptor(ns, 'x');\n \ function threw(fn) { try { fn(); return false; } catch (e) { return e instanceof TypeError; } }\n \ globalThis.__ns = [\n \ Object.isExtensible(ns),\n \ d.writable === true && d.enumerable === true && d.configurable === false,\n \ Reflect.set(ns, 'x', 9),\n \ threw(function () { ns.x = 9; }),\n \ Reflect.set(ns, Symbol('s'), 1),\n \ Reflect.defineProperty(ns, 'x', {}),\n \ Reflect.defineProperty(ns, 'x', { value: 9 }),\n \ threw(function () { Object.defineProperty(ns, 'x', { value: 9 }); }),\n \ Reflect.defineProperty(ns, 'x', { writable: false }),\n \ Reflect.defineProperty(ns, 'newKey', {}),\n \ threw(function () { Object.freeze(ns); }),\n \ Object.isFrozen(ns),\n \ Object.seal(ns) === ns,\n \ ns.default,\n \ ].join('|');", ) .expect("write main"); let _cleanup = Cleanup(dir.clone()); let result = run_namespace_module(&dir); assert_eq!( result, "false|true|false|true|false|true|false|true|false|false|true|false|true|2", "命名空间 exotic 语义不符" ); }