mirror of
https://github.com/pjh456/OxideJS.git
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73 lines
3.3 KiB
Rust
73 lines
3.3 KiB
Rust
//! TDZ 错误消息绑定名钉：运行时 cell 的四个 TDZ 抛点（own cell 读/写、upvalue
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//! 读/写）消息须携带被访问绑定名（`Cannot access 'x' before initialization`，
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//! 与 node 口径一致）；取不到名时回退通用文本。每站点各钉一例：闭包读未初始化
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//! 捕获 let（LOAD_UPVALUE）、闭包写未初始化捕获 let（STORE_UPVALUE）、同函数块级
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//! let 声明前读（CELL_GET）、同函数块级 let 声明前写（CELL_SET）。
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//!
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//! 块级 let 用例的被捕获绑定须被嵌套闭包引用（捕获名跳过静态 TDZ 守卫、留运行时
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//! 判定），故源例均含一个引用该绑定的嵌套闭包。顶层直读（无函数对象）取不到名，
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//! 回退通用文本，属已知残面，单独钉住。
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use std::sync::Arc;
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use oxide_compiler::compiler::Compiler;
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use oxide_compiler::DefaultCompilerService;
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use oxide_vm::vm::Vm;
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fn eval(source: &str) -> Result<oxide_types::value::JsValue, String> {
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let allocator = oxide_parser::Allocator::default();
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let program = oxide_parser::parse(&allocator, source).map_err(|e| format!("parse error: {}", e[0].message))?;
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let module = Compiler::new().compile(&program).map_err(|e| format!("compile error: {e}"))?;
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let mut vm = Vm::new();
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vm.set_compiler_service(Arc::new(DefaultCompilerService));
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vm.run(&Arc::new(module))
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}
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/// 断言程序抛错且未捕获错误消息含带名 TDZ 形态。
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fn assert_tdz_message(source: &str, binding: &str) {
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let err = match eval(source) {
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Ok(v) => panic!("expected a TDZ throw, got completion value {v:?}\nsource: {source}"),
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Err(e) => e,
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};
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let expected = format!("Cannot access '{binding}' before initialization");
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assert!(err.contains(&expected), "expected {expected} in: {err}\nsource: {source}");
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}
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#[test]
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fn tdz_upvalue_read_message_carries_binding_name() {
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// 闭包读未初始化捕获 let（LOAD_UPVALUE 站点）：消息带绑定名。
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assert_tdz_message("function f() { return x; } f(); let x = 1", "x");
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}
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#[test]
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fn tdz_upvalue_write_message_carries_binding_name() {
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// 闭包写未初始化捕获 let（STORE_UPVALUE 站点）：消息带绑定名。
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assert_tdz_message("function f() { x = 1; } f(); let x = 1", "x");
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}
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#[test]
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fn tdz_cell_read_message_carries_binding_name() {
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// 同函数块级 let 声明前读（CELL_GET 站点）：绑定被块内闭包捕获，静态守卫
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// 跳过，声明前读经运行时 cell 抛带名 TDZ。
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assert_tdz_message("function f() { const g = () => x; return x; let x; } f()", "x");
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}
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#[test]
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fn tdz_cell_write_message_carries_binding_name() {
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// 同函数块级 let 声明前写（CELL_SET 站点）：同读例的捕获形态。
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assert_tdz_message("function f() { const g = () => x; x = 1; let x; } f()", "x");
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}
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#[test]
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fn tdz_top_level_read_falls_back_to_generic_message() {
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// 顶层直读（无函数对象）取不到绑定名：回退通用文本（已知残面钉）。
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let err = match eval("function f() { return x; } x; let x = 1") {
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Ok(v) => panic!("expected a TDZ throw, got completion value {v:?}"),
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Err(e) => e,
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};
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assert!(
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err.contains("Cannot access variable before initialization"),
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"expected generic TDZ message in: {err}"
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);
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}
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