v8/test/mjsunit/strict-mode.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
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function CheckStrictMode(code, exception) {
  assertDoesNotThrow(code);
  assertThrows("'use strict';\n" + code, exception);
  assertThrows('"use strict";\n' + code, exception);
  assertDoesNotThrow("\
    function outer() {\
      function inner() {\n"
        + code +
      "\n}\
    }");
  assertThrows("\
    function outer() {\
      'use strict';\
      function inner() {\n"
        + code +
      "\n}\
    }", exception);
}

// Incorrect 'use strict' directive.
function UseStrictEscape() {
  "use\\x20strict";
  with ({}) {};
}

// 'use strict' in non-directive position.
function UseStrictNonDirective() {
  void(0);
  "use strict";
  with ({}) {};
}

// Multiple directives, including "use strict".
assertThrows('\
"directive 1";\
"another directive";\
"use strict";\
"directive after strict";\
"and one more";\
with({}) {}', SyntaxError);

// 'with' disallowed in strict mode.
CheckStrictMode("with({}) {}", SyntaxError);

// Function named 'eval'.
CheckStrictMode("function eval() {}", SyntaxError)

// Function named 'arguments'.
CheckStrictMode("function arguments() {}", SyntaxError)

// Function parameter named 'eval'.
CheckStrictMode("function foo(a, b, eval, c, d) {}", SyntaxError)

// Function parameter named 'arguments'.
CheckStrictMode("function foo(a, b, arguments, c, d) {}", SyntaxError)

// Property accessor parameter named 'eval'.
CheckStrictMode("var o = { set foo(eval) {} }", SyntaxError)

// Property accessor parameter named 'arguments'.
CheckStrictMode("var o = { set foo(arguments) {} }", SyntaxError)

// Duplicate function parameter name.
CheckStrictMode("function foo(a, b, c, d, b) {}", SyntaxError)

// catch(eval)
CheckStrictMode("try{}catch(eval){};", SyntaxError)

// catch(arguments)
CheckStrictMode("try{}catch(arguments){};", SyntaxError)

// var eval
CheckStrictMode("var eval;", SyntaxError)

// var arguments
CheckStrictMode("var arguments;", SyntaxError)

// Strict mode applies to the function in which the directive is used..
assertThrows('\
function foo(eval) {\
  "use strict";\
}', SyntaxError);

// Strict mode doesn't affect the outer stop of strict code.
function NotStrict(eval) {
  function Strict() {
    "use strict";
  }
  with ({}) {};
}

// Octal literal
CheckStrictMode("var x = 012");
CheckStrictMode("012");
CheckStrictMode("'Hello octal\\032'");
CheckStrictMode("function octal() { return 012; }");
CheckStrictMode("function octal() { return '\\032'; }");

// Octal before "use strict"
assertThrows('\
  function strict() {\
    "octal\\032directive";\
    "use strict";\
  }', SyntaxError);

// Duplicate data properties.
CheckStrictMode("var x = { dupe : 1, nondupe: 3, dupe : 2 };", SyntaxError)
CheckStrictMode("var x = { '1234' : 1, '2345' : 2, '1234' : 3 };", SyntaxError)
CheckStrictMode("var x = { '1234' : 1, '2345' : 2, 1234 : 3 };", SyntaxError)
CheckStrictMode("var x = { 3.14 : 1, 2.71 : 2, 3.14 : 3 };", SyntaxError)
CheckStrictMode("var x = { 3.14 : 1, '3.14' : 2 };", SyntaxError)
CheckStrictMode("var x = { 123: 1, 123.00000000000000000000000000000000000000000000000000000000000000000001 : 2 }", SyntaxError)

// Non-conflicting data properties.
function StrictModeNonDuplicate() {
  "use strict";
  var x = { 123 : 1, "0123" : 2 };
  var x = { 123: 1, '123.00000000000000000000000000000000000000000000000000000000000000000001' : 2 }
}

//CheckStrictMode("", SyntaxError)

// Two getters (non-strict)
assertThrows("var x = { get foo() { }, get foo() { } };", SyntaxError)
assertThrows("var x = { get foo(){}, get 'foo'(){}};", SyntaxError)
assertThrows("var x = { get 12(){}, get '12'(){}};", SyntaxError)

// Two setters (non-strict)
assertThrows("var x = { set foo(v) { }, set foo(v) { } };", SyntaxError)
assertThrows("var x = { set foo(v) { }, set 'foo'(v) { } };", SyntaxError)
assertThrows("var x = { set 13(v) { }, set '13'(v) { } };", SyntaxError)

// Setter and data (non-strict)
assertThrows("var x = { foo: 'data', set foo(v) { } };", SyntaxError)
assertThrows("var x = { set foo(v) { }, foo: 'data' };", SyntaxError)
assertThrows("var x = { foo: 'data', set 'foo'(v) { } };", SyntaxError)
assertThrows("var x = { set foo(v) { }, 'foo': 'data' };", SyntaxError)
assertThrows("var x = { 'foo': 'data', set foo(v) { } };", SyntaxError)
assertThrows("var x = { set 'foo'(v) { }, foo: 'data' };", SyntaxError)
assertThrows("var x = { 'foo': 'data', set 'foo'(v) { } };", SyntaxError)
assertThrows("var x = { set 'foo'(v) { }, 'foo': 'data' };", SyntaxError)
assertThrows("var x = { 12: 1, set '12'(v){}};", SyntaxError);
assertThrows("var x = { 12: 1, set 12(v){}};", SyntaxError);
assertThrows("var x = { '12': 1, set '12'(v){}};", SyntaxError);
assertThrows("var x = { '12': 1, set 12(v){}};", SyntaxError);

// Getter and data (non-strict)
assertThrows("var x = { foo: 'data', get foo() { } };", SyntaxError)
assertThrows("var x = { get foo() { }, foo: 'data' };", SyntaxError)
assertThrows("var x = { 'foo': 'data', get foo() { } };", SyntaxError)
assertThrows("var x = { get 'foo'() { }, 'foo': 'data' };", SyntaxError)
assertThrows("var x = { '12': 1, get '12'(){}};", SyntaxError);
assertThrows("var x = { '12': 1, get 12(){}};", SyntaxError);