113 lines
3.8 KiB
Rust
113 lines
3.8 KiB
Rust
//! arguments 对象执行语义测试：实参个数/索引读取、箭头函数词法继承、
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//! 默认参数引用、方法调用、闭包捕获、显式声明屏蔽、嵌套函数调用帧边界。
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use oxide_compiler::compiler::Compiler;
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use oxide_types::value::JsValue;
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use oxide_vm::vm::Vm;
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fn eval(vm: &mut Vm, source: &str) -> Result<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))?;
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let module = Compiler::new().compile(&program).map_err(|e| format!("Compile error: {}", e))?;
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vm.run(&module)
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}
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#[test]
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fn arguments_length_counts_actual_args() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(){return arguments.length}; f(1,2,3)").unwrap();
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assert_eq!(result.as_int(), 3);
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}
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#[test]
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fn arguments_index_reads_first_arg() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(a){return arguments[0]}; f(42)").unwrap();
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assert_eq!(result.as_int(), 42);
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}
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#[test]
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fn arguments_index_reads_extra_arg() {
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// 实参多于形参：多余实参仍可从 arguments 读取。
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(a){return arguments[1]}; f(1, 99)").unwrap();
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assert_eq!(result.as_int(), 99);
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}
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#[test]
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fn arrow_inherits_outer_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(){return (()=>arguments.length)()}; f(1,2)").unwrap();
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assert_eq!(result.as_int(), 2);
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}
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#[test]
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fn default_param_can_read_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(a=arguments.length){return a}; f()").unwrap();
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assert_eq!(result.as_int(), 0);
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}
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#[test]
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fn method_call_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "var o={m:function(){return arguments.length}}; o.m(5,6)").unwrap();
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assert_eq!(result.as_int(), 2);
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}
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#[test]
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fn closure_captures_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(){var g=()=>arguments[0]; return g()}; f('x')").unwrap();
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assert_eq!(vm.lookup_str(result).as_deref(), Some("x"));
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}
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#[test]
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fn arguments_not_created_when_param_named_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(arguments){return arguments}; f(7)").unwrap();
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assert_eq!(result.as_int(), 7);
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}
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#[test]
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fn arguments_not_created_when_var_shadowed() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function f(){var arguments=9; return arguments}; f(1)").unwrap();
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assert_eq!(result.as_int(), 9);
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}
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#[test]
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fn arguments_object_has_length_and_callee() {
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let mut vm = Vm::new();
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let result =
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eval(&mut vm, "function f(){return arguments.callee === f && arguments.length === 2}; f(1,2)").unwrap();
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assert_eq!(result, JsValue::bool(true));
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}
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#[test]
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fn arguments_frame_boundary_across_nested_calls() {
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// 子调用返回后父函数的 arguments 实参区仍完好（帧恢复截断不越界）。
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function g(){return 1} function f(){return arguments.length + g()}; f(4,5,6)").unwrap();
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assert_eq!(result.as_int(), 4, "arguments.length 3 + g() 1 = 4");
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}
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#[test]
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fn nested_plain_function_has_own_arguments() {
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// 非箭头嵌套函数创建自己的 arguments（空实参），不继承外层。
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let mut vm = Vm::new();
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let result = eval(
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&mut vm,
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"function f(){function g(){return arguments.length} return g() === 0 && arguments.length === 1}; f(8)",
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)
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.unwrap();
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assert_eq!(result, JsValue::bool(true));
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}
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#[test]
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fn new_expression_target_gets_arguments() {
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let mut vm = Vm::new();
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let result = eval(&mut vm, "function Ctor(){this.n=arguments.length} var c=new Ctor(1,2,3); c.n").unwrap();
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assert_eq!(result.as_int(), 3);
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}
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