Implement set trap for proxies, and revamp class hierarchy in preparation

test/harmony/proxies.js

+
+
+function ASSERT(b) {
+  print(b ? "OK." : "Error!")
+}
+
+
+// Getters.
+print("Getters:")
+
+function TestGet(handler) {
+  var o = Proxy.create(handler)
+  ASSERT(o.a === 42)
+  ASSERT(o["b"] === 42)
+//  ASSERT(Object.getOwnPropertyDescriptor(o, "b").value === 42)
+}
+
+TestGet({get: function(r, k) { return 42 }})
+TestGet({getPropertyDescriptor: function(k) { return {value: 42} }})
+TestGet({getPropertyDescriptor: function(k) { return {get value() { return 42 }} }})
+TestGet({get: undefined, getPropertyDescriptor: function(k) { return {value: 42} }})
+
+TestGet(Proxy.create({get: function(pr, pk) { return function(r, k) { return 42 } }}))
+
+
+// Setters.
+print("Setters:")
+
+var key
+var val
+function TestSet(handler) {
+  var o = Proxy.create(handler)
+  ASSERT(o.a = 42)
+  ASSERT(key === "a")
+  ASSERT(val === 42)
+  ASSERT(o["b"] = 43)
+  ASSERT(key === "b")
+  ASSERT(val === 43)
+//  ASSERT(Object.defineProperty(o, "c", {value: 44}))
+//  ASSERT(key === "c")
+//  ASSERT(val === 44)
+}
+
+TestSet({set: function(r, k, v) { key = k; val = v; return true }})
+TestSet({getOwnPropertyDescriptor: function(k) { return {writable: true} },
+         defineProperty: function(k, desc) { key = k, val = desc.value }})
+TestSet({getOwnPropertyDescriptor: function(k) { return {get writable() { return true }} },
+         defineProperty: function(k, desc) { key = k, val = desc.value }})
+TestSet({getOwnPropertyDescriptor: function(k) { return {set: function(v) { key = k, val = v }} }})
+TestSet({getOwnPropertyDescriptor: function(k) { return null },
+         getPropertyDescriptor: function(k) { return {writable: true} },
+         defineProperty: function(k, desc) { key = k, val = desc.value }})
+TestSet({getOwnPropertyDescriptor: function(k) { return null },
+         getPropertyDescriptor: function(k) { return {get writable() { return true }} },
+         defineProperty: function(k, desc) { key = k, val = desc.value }})
+TestSet({getOwnPropertyDescriptor: function(k) { return null },
+         getPropertyDescriptor: function(k) { return {set: function(v) { key = k, val = v }} }})
+TestSet({getOwnPropertyDescriptor: function(k) { return null },
+         getPropertyDescriptor: function(k) { return null },
+         defineProperty: function(k, desc) { key = k, val = desc.value }})
+
+TestSet(Proxy.create({get: function(pr, pk) { return function(r, k, v) { key = k; val = v; return true } }}))
+
+
+
+// Comparison.
+print("Comparison:")
+
+var o1 = Proxy.create({})
+var o2 = Proxy.create({})
+
+ASSERT(o1 == o1)
+ASSERT(o2 == o2)
+ASSERT(!(o1 == o2))
+ASSERT(!(o1 == {}))
+ASSERT(!({} == o2))
+ASSERT(!({} == {}))
+
+ASSERT(o1 === o1)
+ASSERT(o2 === o2)
+ASSERT(!(o1 === o2))
+ASSERT(!(o1 === {}))
+ASSERT(!({} === o2))
+ASSERT(!({} === {}))
+
+
+
+// Type.
+print("Type:")
+
+ASSERT(typeof Proxy.create({}) == "object")
+ASSERT("object" == typeof Proxy.create({}))
+ASSERT((function(o) { return typeof o })(Proxy.create({})) == "object")
+
+// No function proxies yet.