v8/test/mjsunit/harmony/proxies-for.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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// Flags: --harmony-proxies


// Helper.

function TestWithProxies(test, x, y, z) {
  test(function(h){ return new Proxy({}, h) }, x, y, z)
  test(function(h) {
    return Proxy.createFunction(h, function() {})
  }, x, y, z)
}


// Iterate over a proxy.

function TestForIn(properties, handler) {
  TestWithProxies(TestForIn2, properties, handler)
}

function TestForIn2(create, properties, handler) {
  var p = create(handler)
  var found = []
  for (var x in p) found.push(x)
  assertArrayEquals(properties, found)
}

TestForIn(["0", "a"], {
  enumerate: function() { return [0, "a"] }
})

TestForIn(["null", "a"], {
  enumerate: function() { return this.enumerate2() },
  enumerate2: function() { return [null, "a"] }
})

TestForIn(["b", "d"], {
  getPropertyNames: function() { return ["a", "b", "c", "d", "e"] },
  getPropertyDescriptor: function(k) {
    switch (k) {
      case "a": return {enumerable: false, value: "3", configurable: true};
      case "b": return {enumerable: true, get get() {}, configurable: true};
      case "c": return {value: 4, configurable: true};
      case "d": return {get enumerable() { return true }, configurable: true};
      default: return undefined;
    }
  }
})

TestForIn(["b", "a", "0", "c"], new Proxy({}, {
  get: function(pr, pk) {
    return function() { return ["b", "a", 0, "c"] }
  }
}))



// Iterate over an object with a proxy prototype.

function TestForInDerived(properties, handler) {
  TestWithProxies(TestForInDerived2, properties, handler)
}

function TestForInDerived2(create, properties, handler) {
  var p = create(handler)
  var o = Object.create(p)
  o.z = 0
  var found = []
  for (var x in o) found.push(x)
  assertArrayEquals(["z"].concat(properties), found)

  var oo = Object.create(o)
  oo.y = 0
  var found = []
  for (var x in oo) found.push(x)
  assertArrayEquals(["y", "z"].concat(properties), found)
}

TestForInDerived(["0", "a"], {
  enumerate: function() { return [0, "a"] },
  getPropertyDescriptor: function(k) {
    return k == "0" || k == "a" ? {configurable: true} : undefined
  }
})

TestForInDerived(["null", "a"], {
  enumerate: function() { return this.enumerate2() },
  enumerate2: function() { return [null, "a"] },
  getPropertyDescriptor: function(k) {
    return k == "null" || k == "a" ? {configurable: true} : undefined
  }
})

TestForInDerived(["b", "d"], {
  getPropertyNames: function() { return ["a", "b", "c", "d", "e"] },
  getPropertyDescriptor: function(k) {
    switch (k) {
      case "a": return {enumerable: false, value: "3", configurable: true};
      case "b": return {enumerable: true, get get() {}, configurable: true};
      case "c": return {value: 4, configurable: true};
      case "d": return {get enumerable() { return true }, configurable: true};
      default: return undefined;
    }
  }
})



// Throw exception in enumerate trap.

function TestForInThrow(handler) {
  TestWithProxies(TestForInThrow2, handler)
}

function TestForInThrow2(create, handler) {
  var p = create(handler)
  var o = Object.create(p)
  assertThrows(function(){ for (var x in p) {} }, "myexn")
  assertThrows(function(){ for (var x in o) {} }, "myexn")
}

TestForInThrow({
  enumerate: function() { throw "myexn" }
})

TestForInThrow({
  enumerate: function() { return this.enumerate2() },
  enumerate2: function() { throw "myexn" }
})

TestForInThrow({
  getPropertyNames: function() { throw "myexn" }
})

TestForInThrow({
  getPropertyNames: function() { return ["a"] },
  getPropertyDescriptor: function() { throw "myexn" }
})

TestForInThrow(new Proxy({}, {
  get: function(pr, pk) {
    return function() { throw "myexn" }
  }
}));

(function() {
  var p = new Proxy({}, {enumerate:function() { return [0]; }});
  var o = [0];
  o.__proto__ = p;
  var keys = [];
  for (var k in o) { keys.push(k); };
  assertEquals(["0"], keys);
})();

(function () {
  var p = new Proxy({}, {getOwnPropertyNames:
    function() { return [1, Symbol(), 2] }});
  assertEquals(["1","2"], Object.getOwnPropertyNames(p));
})();