Unship ES6 iteration and unscopables on 3.28

test/mjsunit/es6/unscopables.js

-// Copyright 2014 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --harmony-unscopables
-// Flags: --harmony-collections
-
-var global = this;
-var globalProto = Object.getPrototypeOf(global);
-
-// Number of objects being tested. There is an assert ensuring this is correct.
-var objectCount = 21;
-
-
-function runTest(f) {
-  function restore(object, oldProto) {
-    delete object[Symbol.unscopables];
-    delete object.x;
-    delete object.x_;
-    delete object.y;
-    delete object.z;
-    Object.setPrototypeOf(object, oldProto);
-  }
-
-  function getObject(i) {
-    var objects = [
-      {},
-      [],
-      function() {},
-      function() {
-        return arguments;
-      }(),
-      function() {
-        'use strict';
-        return arguments;
-      }(),
-      Object(1),
-      Object(true),
-      Object('bla'),
-      new Date,
-      new RegExp,
-      new Set,
-      new Map,
-      new WeakMap,
-      new WeakSet,
-      new ArrayBuffer(10),
-      new Int32Array(5),
-      Object,
-      Function,
-      Date,
-      RegExp,
-      global
-    ];
-
-    assertEquals(objectCount, objects.length);
-    return objects[i];
-  }
-
-  // Tests depends on this not being there to start with.
-  delete Array.prototype[Symbol.unscopables];
-
-  if (f.length === 1) {
-    for (var i = 0; i < objectCount; i++) {
-      var object = getObject(i);
-      var oldObjectProto = Object.getPrototypeOf(object);
-      f(object);
-      restore(object, oldObjectProto);
-    }
-  } else {
-    for (var i = 0; i < objectCount; i++) {
-      for (var j = 0; j < objectCount; j++) {
-        var object = getObject(i);
-        var proto = getObject(j);
-        if (object === proto) {
-          continue;
-        }
-        var oldObjectProto = Object.getPrototypeOf(object);
-        var oldProtoProto = Object.getPrototypeOf(proto);
-        f(object, proto);
-        restore(object, oldObjectProto);
-        restore(proto, oldProtoProto);
-      }
-    }
-  }
-}
-
-// Test array first, since other tests are changing
-// Array.prototype[Symbol.unscopables].
-function TestArrayPrototypeUnscopables() {
-  var descr = Object.getOwnPropertyDescriptor(Array.prototype,
-                                              Symbol.unscopables);
-  assertFalse(descr.enumerable);
-  assertFalse(descr.writable);
-  assertTrue(descr.configurable);
-  assertEquals(null, Object.getPrototypeOf(descr.value));
-
-  var copyWithin = 'local copyWithin';
-  var entries = 'local entries';
-  var fill = 'local fill';
-  var find = 'local find';
-  var findIndex = 'local findIndex';
-  var keys = 'local keys';
-  var values = 'local values';
-
-  var array = [];
-  array.toString = 42;
-
-  with (array) {
-    assertEquals('local copyWithin', copyWithin);
-    assertEquals('local entries', entries);
-    assertEquals('local fill', fill);
-    assertEquals('local find', find);
-    assertEquals('local findIndex', findIndex);
-    assertEquals('local keys', keys);
-    assertEquals('local values', values);
-    assertEquals(42, toString);
-  }
-}
-TestArrayPrototypeUnscopables();
-
-
-
-function TestBasics(object) {
-  var x = 1;
-  var y = 2;
-  var z = 3;
-  object.x = 4;
-  object.y = 5;
-
-  with (object) {
-    assertEquals(4, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
-  }
-
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
-  }
-
-  object[Symbol.unscopables] = {x: 0, y: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(2, y);
-    assertEquals(3, z);
-  }
-}
-runTest(TestBasics);
-
-
-function TestUnscopableChain(object) {
-  var x = 1;
-  object.x = 2;
-
-  with (object) {
-    assertEquals(2, x);
-  }
-
-  object[Symbol.unscopables] = {
-    __proto__: {x: true}
-  };
-  with (object) {
-    assertEquals(1, x);
-  }
-}
-runTest(TestUnscopableChain);
-
-
-function TestBasicsSet(object) {
-  var x = 1;
-  object.x = 2;
-
-  with (object) {
-    assertEquals(2, x);
-  }
-
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    x = 3;
-    assertEquals(3, x);
-  }
-
-  assertEquals(3, x);
-  assertEquals(2, object.x);
-}
-runTest(TestBasicsSet);
-
-
-function TestOnProto(object, proto) {
-  var x = 1;
-  var y = 2;
-  var z = 3;
-  proto.x = 4;
-
-  Object.setPrototypeOf(object, proto);
-  object.y = 5;
-
-  with (object) {
-    assertEquals(4, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
-  }
-
-  proto[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
-  }
-
-  object[Symbol.unscopables] = {y: true};
-  with (object) {
-    assertEquals(4, x);
-    assertEquals(2, y);
-    assertEquals(3, z);
-  }
-
-  proto[Symbol.unscopables] = {y: true};
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    assertEquals(5, y);
-    assertEquals(3, z);
-  }
-}
-runTest(TestOnProto);
-
-
-function TestSetBlockedOnProto(object, proto) {
-  var x = 1;
-  object.x = 2;
-
-  with (object) {
-    assertEquals(2, x);
-  }
-
-  Object.setPrototypeOf(object, proto);
-  proto[Symbol.unscopables] = {x: true};
-  with (object) {
-    assertEquals(1, x);
-    x = 3;
-    assertEquals(3, x);
-  }
-
-  assertEquals(3, x);
-  assertEquals(2, object.x);
-}
-runTest(TestSetBlockedOnProto);
-
-
-function TestNonObject(object) {
-  var x = 1;
-  var y = 2;
-  object.x = 3;
-  object.y = 4;
-
-  object[Symbol.unscopables] = 'xy';
-  with (object) {
-    assertEquals(3, x);
-    assertEquals(4, y);
-  }
-
-  object[Symbol.unscopables] = null;
-  with (object) {
-    assertEquals(3, x);
-    assertEquals(4, y);
-  }
-}
-runTest(TestNonObject);
-
-
-function TestChangeDuringWith(object) {
-  var x = 1;
-  var y = 2;
-  object.x = 3;
-  object.y = 4;
-
-  with (object) {
-    assertEquals(3, x);
-    assertEquals(4, y);
-    object[Symbol.unscopables] = {x: true};
-    assertEquals(1, x);
-    assertEquals(4, y);
-  }
-}
-runTest(TestChangeDuringWith);
-
-
-function TestChangeDuringWithWithPossibleOptimization(object) {
-  var x = 1;
-  object.x = 2;
-  with (object) {
-    for (var i = 0; i < 1000; i++) {
-      if (i === 500) object[Symbol.unscopables] = {x: true};
-      assertEquals(i < 500 ? 2: 1, x);
-    }
-  }
-}
-TestChangeDuringWithWithPossibleOptimization({});
-
-
-function TestChangeDuringWithWithPossibleOptimization2(object) {
-  var x = 1;
-  object.x = 2;
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    for (var i = 0; i < 1000; i++) {
-      if (i === 500) delete object[Symbol.unscopables];
-      assertEquals(i < 500 ? 1 : 2, x);
-    }
-  }
-}
-TestChangeDuringWithWithPossibleOptimization2({});
-
-
-function TestChangeDuringWithWithPossibleOptimization3(object) {
-  var x = 1;
-  object.x = 2;
-  object[Symbol.unscopables] = {};
-  with (object) {
-    for (var i = 0; i < 1000; i++) {
-      if (i === 500) object[Symbol.unscopables].x = true;
-      assertEquals(i < 500 ? 2 : 1, x);
-    }
-  }
-}
-TestChangeDuringWithWithPossibleOptimization3({});
-
-
-function TestChangeDuringWithWithPossibleOptimization4(object) {
-  var x = 1;
-  object.x = 2;
-  object[Symbol.unscopables] = {x: true};
-  with (object) {
-    for (var i = 0; i < 1000; i++) {
-      if (i === 500) delete object[Symbol.unscopables].x;
-      assertEquals(i < 500 ? 1 : 2, x);
-    }
-  }
-}
-TestChangeDuringWithWithPossibleOptimization4({});
-
-
-function TestAccessorReceiver(object, proto) {
-  var x = 'local';
-
-  Object.defineProperty(proto, 'x', {
-    get: function() {
-      assertEquals(object, this);
-      return this.x_;
-    },
-    configurable: true
-  });
-  proto.x_ = 'proto';
-
-  Object.setPrototypeOf(object, proto);
-  proto.x_ = 'object';
-
-  with (object) {
-    assertEquals('object', x);
-  }
-}
-runTest(TestAccessorReceiver);
-
-
-function TestUnscopablesGetter(object) {
-  // This test gets really messy when object is the global since the assert
-  // functions are properties on the global object and the call count gets
-  // completely different.
-  if (object === global) return;
-
-  var x = 'local';
-  object.x = 'object';
-
-  var callCount = 0;
-  Object.defineProperty(object, Symbol.unscopables, {
-    get: function() {
-      callCount++;
-      return {};
-    },
-    configurable: true
-  });
-  with (object) {
-    assertEquals('object', x);
-  }
-  // Once for HasBinding
-  assertEquals(1, callCount);
-
-  callCount = 0;
-  Object.defineProperty(object, Symbol.unscopables, {
-    get: function() {
-      callCount++;
-      return {x: true};
-    },
-    configurable: true
-  });
-  with (object) {
-    assertEquals('local', x);
-  }
-  // Once for HasBinding
-  assertEquals(1, callCount);
-
-  callCount = 0;
-  Object.defineProperty(object, Symbol.unscopables, {
-    get: function() {
-      callCount++;
-      return callCount == 1 ? {} : {x: true};
-    },
-    configurable: true
-  });
-  with (object) {
-    x = 1;
-  }
-  // Once for HasBinding
-  assertEquals(1, callCount);
-  assertEquals(1, object.x);
-  assertEquals('local', x);
-  with (object) {
-    x = 2;
-  }
-  // One more HasBinding.
-  assertEquals(2, callCount);
-  assertEquals(1, object.x);
-  assertEquals(2, x);
-}
-runTest(TestUnscopablesGetter);
-
-
-var global = this;
-function TestUnscopablesGetter2() {
-  var x = 'local';
-
-  var globalProto = Object.getPrototypeOf(global);
-  var protos = [{}, [], function() {}, global];
-  var objects = [{}, [], function() {}];
-
-  protos.forEach(function(proto) {
-    objects.forEach(function(object) {
-      Object.defineProperty(proto, 'x', {
-        get: function() {
-          assertEquals(object, this);
-          return 'proto';
-        },
-        configurable: true
-      });
-
-      object.__proto__ = proto;
-      Object.defineProperty(object, 'x', {
-        get: function() {
-          assertEquals(object, this);
-          return 'object';
-        },
-        configurable: true
-      });
-
-      with (object) {
-        assertEquals('object', x);
-      }
-
-      object[Symbol.unscopables] = {x: true};
-      with (object) {
-        assertEquals('local', x);
-      }
-
-      delete proto[Symbol.unscopables];
-      delete object[Symbol.unscopables];
-    });
-  });
-
-  delete global.x;
-  Object.setPrototypeOf(global, globalProto);
-}
-TestUnscopablesGetter2();
-
-
-function TestSetterOnBlacklisted(object, proto) {
-  var x = 'local';
-  Object.defineProperty(proto, 'x', {
-    set: function(x) {
-      assertUnreachable();
-    },
-    get: function() {
-      return 'proto';
-    },
-    configurable: true
-  });
-  Object.setPrototypeOf(object, proto);
-  Object.defineProperty(object, 'x', {
-    get: function() {
-      return this.x_;
-    },
-    set: function(x) {
-      this.x_ = x;
-    },
-    configurable: true
-  });
-  object.x_ = 1;
-
-  with (object) {
-    x = 2;
-    assertEquals(2, x);
-  }
-
-  assertEquals(2, object.x);
-
-  object[Symbol.unscopables] = {x: true};
-
-  with (object) {
-    x = 3;
-    assertEquals(3, x);
-  }
-
-  assertEquals(2, object.x);
-}
-runTest(TestSetterOnBlacklisted);
-
-
-function TestObjectsAsUnscopables(object, unscopables) {
-  var x = 1;
-  object.x = 2;
-
-  with (object) {
-    assertEquals(2, x);
-    object[Symbol.unscopables] = unscopables;
-    assertEquals(2, x);
-  }
-}
-runTest(TestObjectsAsUnscopables);
-
-
-function TestAccessorOnUnscopables(object) {
-  var x = 1;
-  object.x = 2;
-
-  var unscopables = {
-    get x() {
-      assertUnreachable();
-    }
-  };
-
-  with (object) {
-    assertEquals(2, x);
-    object[Symbol.unscopables] = unscopables;
-    assertEquals(1, x);
-  }
-}
-runTest(TestAccessorOnUnscopables);
-
-
-function TestLengthUnscopables(object, proto) {
-  var length = 2;
-  with (object) {
-    assertEquals(1, length);
-    object[Symbol.unscopables] = {length: true};
-    assertEquals(2, length);
-    delete object[Symbol.unscopables];
-    assertEquals(1, length);
-  }
-}
-TestLengthUnscopables([1], Array.prototype);
-TestLengthUnscopables(function(x) {}, Function.prototype);
-TestLengthUnscopables(new String('x'), String.prototype);
-
-
-function TestFunctionNameUnscopables(object) {
-  var name = 'local';
-  with (object) {
-    assertEquals('f', name);
-    object[Symbol.unscopables] = {name: true};
-    assertEquals('local', name);
-    delete object[Symbol.unscopables];
-    assertEquals('f', name);
-  }
-}
-TestFunctionNameUnscopables(function f() {});
-
-
-function TestFunctionPrototypeUnscopables() {
-  var prototype = 'local';
-  var f = function() {};
-  var g = function() {};
-  Object.setPrototypeOf(f, g);
-  var fp = f.prototype;
-  var gp = g.prototype;
-  with (f) {
-    assertEquals(fp, prototype);
-    f[Symbol.unscopables] = {prototype: true};
-    assertEquals('local', prototype);
-    delete f[Symbol.unscopables];
-    assertEquals(fp, prototype);
-  }
-}
-TestFunctionPrototypeUnscopables(function() {});
-
-
-function TestFunctionArgumentsUnscopables() {
-  var func = function() {
-    var arguments = 'local';
-    var args = func.arguments;
-    with (func) {
-      assertEquals(args, arguments);
-      func[Symbol.unscopables] = {arguments: true};
-      assertEquals('local', arguments);
-      delete func[Symbol.unscopables];
-      assertEquals(args, arguments);
-    }
-  }
-  func(1);
-}
-TestFunctionArgumentsUnscopables();
-
-
-function TestArgumentsLengthUnscopables() {
-  var func = function() {
-    var length = 'local';
-    with (arguments) {
-      assertEquals(1, length);
-      arguments[Symbol.unscopables] = {length: true};
-      assertEquals('local', length);
-    }
-  }
-  func(1);
-}
-TestArgumentsLengthUnscopables();
-
-
-function TestFunctionCallerUnscopables() {
-  var func = function() {
-    var caller = 'local';
-    with (func) {
-      assertEquals(TestFunctionCallerUnscopables, caller);
-      func[Symbol.unscopables] = {caller: true};
-      assertEquals('local', caller);
-      delete func[Symbol.unscopables];
-      assertEquals(TestFunctionCallerUnscopables, caller);
-    }
-  }
-  func(1);
-}
-TestFunctionCallerUnscopables();
-
-
-function TestGetUnscopablesGetterThrows() {
-  var object = {
-    get x() {
-      assertUnreachable();
-    }
-  };
-  function CustomError() {}
-  Object.defineProperty(object, Symbol.unscopables, {
-    get: function() {
-      throw new CustomError();
-    }
-  });
-  assertThrows(function() {
-    with (object) {
-      x;
-    }
-  }, CustomError);
-}
-TestGetUnscopablesGetterThrows();