Implement for-in loop for proxies.

test/mjsunit/harmony/proxies-for.js

+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --harmony-proxies
+
+
+// Helper.
+
+function TestWithProxies(test, x, y, z) {
+  test(Proxy.create, 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"};
+      case "b": return {enumerable: true, get get() {}};
+      case "c": return {value: 4};
+      case "d": return {get enumerable() { return true }};
+      default: return undefined;
+    }
+  }
+})
+
+TestForIn(["b", "a", "0", "c"], Proxy.create({
+  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" ? {} : undefined
+  }
+})
+
+TestForInDerived(["null", "a"], {
+  enumerate: function() { return this.enumerate2() },
+  enumerate2: function() { return [null, "a"] },
+  getPropertyDescriptor: function(k) {
+    return k == "null" || k == "a" ? {} : undefined
+  }
+})
+
+TestForInDerived(["b", "d"], {
+  getPropertyNames: function() { return ["a", "b", "c", "d", "e"] },
+  getPropertyDescriptor: function(k) {
+    switch (k) {
+      case "a": return {enumerable: false, value: "3"};
+      case "b": return {enumerable: true, get get() {}};
+      case "c": return {value: 4};
+      case "d": return {get enumerable() { return 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(Proxy.create({
+  get: function(pr, pk) {
+    return function() { throw "myexn" }
+  }
+}))