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

// Copyright 2011 the V8 project authors. All rights reserved.
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// 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.
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --harmony-proxies


// Helper.

function CreateFrozen(handler, callTrap, constructTrap) {
  if (handler.fix === undefined) handler.fix = function() { return {} }
  var f = Proxy.createFunction(handler, callTrap, constructTrap)
  Object.freeze(f)
  return f
}


// Ensures that checking the "length" property of a function proxy doesn't
// crash due to lack of a [[Get]] method.
var handler = {
  get : function(r, n) { return n == "length" ? 2 : undefined }
}


// Calling (call, Function.prototype.call, Function.prototype.apply,
//          Function.prototype.bind).

var global_object = this
var receiver

function TestCall(isStrict, callTrap) {
  assertEquals(42, callTrap(5, 37))
  assertEquals(isStrict ? undefined : global_object, receiver)

  var handler = {
    get: function(r, k) {
      return k == "length" ? 2 : Function.prototype[k]
    }
  }
  var f = Proxy.createFunction(handler, callTrap)

  receiver = 333
  assertEquals(42, f(11, 31))
  assertEquals(isStrict ? undefined : global_object, receiver)
  var o = {f: f}
  receiver = 333
  assertEquals(42, o.f(10, 32))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, o["f"](9, 33))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, (1, o).f(8, 34))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, (1, o)["f"](7, 35))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, f.call(o, 32, 10))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, f.call(null, 33, 9))
  assertSame(isStrict ? null : global_object, receiver)
  receiver = 333
  assertEquals(44, f.call(2, 21, 23))
  assertSame(2, receiver.valueOf())
  receiver = 333
  assertEquals(42, Function.prototype.call.call(f, o, 20, 22))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(43, Function.prototype.call.call(f, null, 20, 23))
  assertSame(isStrict ? null : global_object, receiver)
  assertEquals(44, Function.prototype.call.call(f, 2, 21, 23))
  assertEquals(2, receiver.valueOf())
  receiver = 333
  assertEquals(32, f.apply(o, [16, 16]))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(32, Function.prototype.apply.call(f, o, [17, 15]))
  assertSame(o, receiver)

  var ff = Function.prototype.bind.call(f, o, 12)
  assertTrue(ff.length <= 1)  // TODO(rossberg): Not spec'ed yet, be lax.
  receiver = 333
  assertEquals(42, ff(30))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(32, Function.prototype.apply.call(ff, {}, [20]))
  assertSame(o, receiver)

  var fff = Function.prototype.bind.call(ff, o, 30)
  assertEquals(0, fff.length)
  receiver = 333
  assertEquals(42, fff())
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, Function.prototype.call.call(fff, {}))
  assertSame(o, receiver)

  var f = CreateFrozen({}, callTrap)
  receiver = 333
  assertEquals(42, f(11, 31))
  assertSame(isStrict ? undefined : global_object, receiver)
  var o = {f: f}
  receiver = 333
  assertEquals(42, o.f(10, 32))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, o["f"](9, 33))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, (1, o).f(8, 34))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, (1, o)["f"](7, 35))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, Function.prototype.call.call(f, o, 20, 22))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(32, Function.prototype.apply.call(f, o, [17, 15]))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(42, ff(30))
  assertSame(o, receiver)
  receiver = 333
  assertEquals(32, Function.prototype.apply.call(ff, {}, [20]))
  assertSame(o, receiver)
}

TestCall(false, function(x, y) {
  receiver = this
  return x + y
})

TestCall(true, function(x, y) {
  "use strict"
  receiver = this
  return x + y
})

TestCall(false, function() {
  receiver = this; return arguments[0] + arguments[1]
})

TestCall(false, Proxy.createFunction(handler, function(x, y) {
  receiver = this
  return x + y
}))

TestCall(true, Proxy.createFunction(handler, function(x, y) {
  "use strict"
  receiver = this
  return x + y
}))

TestCall(false, CreateFrozen(handler, function(x, y) {
  receiver = this
  return x + y
}))



// Using intrinsics as call traps.

function TestCallIntrinsic(type, callTrap) {
  var f = Proxy.createFunction({}, callTrap)
  var x = f()
  assertTrue(typeof x == type)
}

TestCallIntrinsic("boolean", Boolean)
TestCallIntrinsic("number", Number)
TestCallIntrinsic("string", String)
TestCallIntrinsic("object", Object)
TestCallIntrinsic("function", Function)



// Throwing from call trap.

function TestCallThrow(callTrap) {
  var f = Proxy.createFunction({}, callTrap)
  assertThrows(function(){ f(11) }, "myexn")
  assertThrows(function(){ ({x: f}).x(11) }, "myexn")
  assertThrows(function(){ ({x: f})["x"](11) }, "myexn")
  assertThrows(function(){ Function.prototype.call.call(f, {}, 2) }, "myexn")
  assertThrows(function(){ Function.prototype.apply.call(f, {}, [1]) }, "myexn")

  var f = CreateFrozen({}, callTrap)
  assertThrows(function(){ f(11) }, "myexn")
  assertThrows(function(){ ({x: f}).x(11) }, "myexn")
  assertThrows(function(){ ({x: f})["x"](11) }, "myexn")
  assertThrows(function(){ Function.prototype.call.call(f, {}, 2) }, "myexn")
  assertThrows(function(){ Function.prototype.apply.call(f, {}, [1]) }, "myexn")
}

TestCallThrow(function() { throw "myexn" })
TestCallThrow(Proxy.createFunction({}, function() { throw "myexn" }))
TestCallThrow(CreateFrozen({}, function() { throw "myexn" }))



// Construction (new).

var prototype = {}
var receiver

var handlerWithPrototype = {
  fix: function() { return { prototype: { value: prototype } }; },
  get: function(r, n) {
    if (n == "length") return 2;
    assertEquals("prototype", n);
    return prototype;
  }
}

var handlerSansPrototype = {
  fix: function() { return { length: { value: 2 } } },
  get: function(r, n) {
    if (n == "length") return 2;
    assertEquals("prototype", n);
    return undefined;
  }
}

function ReturnUndef(x, y) {
  "use strict";
  receiver = this;
  this.sum = x + y;
}

function ReturnThis(x, y) {
  "use strict";
  receiver = this;
  this.sum = x + y;
  return this;
}

function ReturnNew(x, y) {
  "use strict";
  receiver = this;
  return {sum: x + y};
}

function ReturnNewWithProto(x, y) {
  "use strict";
  receiver = this;
  var result = Object.create(prototype);
  result.sum = x + y;
  return result;
}

function TestConstruct(proto, constructTrap) {
  TestConstruct2(proto, constructTrap, handlerWithPrototype)
  TestConstruct2(proto, constructTrap, handlerSansPrototype)
}

function TestConstruct2(proto, constructTrap, handler) {
  var f = Proxy.createFunction(handler, function() {}, constructTrap)
  var o = new f(11, 31)
  assertEquals(undefined, receiver)
  assertEquals(42, o.sum)
  assertSame(proto, Object.getPrototypeOf(o))

// TODO(rossberg): does not work yet.
//  var ff = Function.prototype.bind.call(f, o, 10)
//  var o = new ff(32)
//  assertEquals(undefined, receiver)
//  assertEquals(42, o.sum)
//  assertSame(proto, Object.getPrototypeOf(o))

  var f = CreateFrozen(handler, function() {}, constructTrap)
  var o = new f(11, 32)
  assertEquals(undefined, receiver)
  assertEquals(43, o.sum)
  assertSame(proto, Object.getPrototypeOf(o))

  var ff = Function.prototype.bind.call(f, o, 10)
  var o = new ff(32)
  assertEquals(undefined, receiver)
  assertEquals(42, o.sum)
  assertSame(proto, Object.getPrototypeOf(o))
}

TestConstruct(Object.prototype, ReturnNew)
TestConstruct(prototype, ReturnNewWithProto)

TestConstruct(Object.prototype, Proxy.createFunction(handler, ReturnNew))
TestConstruct(prototype, Proxy.createFunction(handler, ReturnNewWithProto))

TestConstruct(Object.prototype, CreateFrozen(handler, ReturnNew))
TestConstruct(prototype, CreateFrozen(handler, ReturnNewWithProto))



// Construction with derived construct trap.

function TestConstructFromCall(proto, returnsThis, callTrap) {
  TestConstructFromCall2(proto, returnsThis, callTrap, handlerWithPrototype)
  TestConstructFromCall2(proto, returnsThis, callTrap, handlerSansPrototype)
}

function TestConstructFromCall2(proto, returnsThis, callTrap, handler) {
  var f = Proxy.createFunction(handler, callTrap)
  var o = new f(11, 31)
  if (returnsThis) assertEquals(o, receiver)
  assertEquals(42, o.sum)
  assertSame(proto, Object.getPrototypeOf(o))

// TODO(rossberg): does not work yet.
//  var ff = Function.prototype.bind.call(f, o, 10)
//  var o = new ff(32)
//  assertEquals(undefined, receiver)
//  assertEquals(42, o.sum)
//  assertSame(proto, Object.getPrototypeOf(o))

  var f = CreateFrozen(handler, callTrap)
  var o = new f(11, 32)
  if (returnsThis) assertEquals(o, receiver)
  assertEquals(43, o.sum)
  assertSame(proto, Object.getPrototypeOf(o))

// TODO(rossberg): does not work yet.
//  var ff = Function.prototype.bind.call(f, o, 10)
//  var o = new ff(32)
//  assertEquals(undefined, receiver)
//  assertEquals(42, o.sum)
//  assertSame(proto, Object.getPrototypeOf(o))
}

TestConstructFromCall(Object.prototype, true, ReturnUndef)
TestConstructFromCall(Object.prototype, true, ReturnThis)
TestConstructFromCall(Object.prototype, false, ReturnNew)
TestConstructFromCall(prototype, false, ReturnNewWithProto)

TestConstructFromCall(Object.prototype, true,
                      Proxy.createFunction(handler, ReturnUndef))
TestConstructFromCall(Object.prototype, true,
                      Proxy.createFunction(handler, ReturnThis))
TestConstructFromCall(Object.prototype, false,
                      Proxy.createFunction(handler, ReturnNew))
TestConstructFromCall(prototype, false,
                      Proxy.createFunction(handler, ReturnNewWithProto))

TestConstructFromCall(Object.prototype, true, CreateFrozen({}, ReturnUndef))
TestConstructFromCall(Object.prototype, true, CreateFrozen({}, ReturnThis))
TestConstructFromCall(Object.prototype, false, CreateFrozen({}, ReturnNew))
TestConstructFromCall(prototype, false, CreateFrozen({}, ReturnNewWithProto))

ReturnUndef.prototype = prototype
ReturnThis.prototype = prototype
ReturnNew.prototype = prototype
ReturnNewWithProto.prototype = prototype

TestConstructFromCall(prototype, true, ReturnUndef)
TestConstructFromCall(prototype, true, ReturnThis)
TestConstructFromCall(Object.prototype, false, ReturnNew)
TestConstructFromCall(prototype, false, ReturnNewWithProto)

TestConstructFromCall(Object.prototype, true,
                      Proxy.createFunction(handler, ReturnUndef))
TestConstructFromCall(Object.prototype, true,
                      Proxy.createFunction(handler, ReturnThis))
TestConstructFromCall(Object.prototype, false,
                      Proxy.createFunction(handler, ReturnNew))
TestConstructFromCall(prototype, false,
                      Proxy.createFunction(handler, ReturnNewWithProto))

TestConstructFromCall(prototype, true,
                      Proxy.createFunction(handlerWithPrototype, ReturnUndef))
TestConstructFromCall(prototype, true,
                      Proxy.createFunction(handlerWithPrototype, ReturnThis))
TestConstructFromCall(Object.prototype, false,
                      Proxy.createFunction(handlerWithPrototype, ReturnNew))
TestConstructFromCall(prototype, false,
                      Proxy.createFunction(handlerWithPrototype,
                                           ReturnNewWithProto))

TestConstructFromCall(prototype, true,
                      CreateFrozen(handlerWithPrototype, ReturnUndef))
TestConstructFromCall(prototype, true,
                      CreateFrozen(handlerWithPrototype, ReturnThis))
TestConstructFromCall(Object.prototype, false,
                      CreateFrozen(handlerWithPrototype, ReturnNew))
TestConstructFromCall(prototype, false,
                      CreateFrozen(handlerWithPrototype, ReturnNewWithProto))



// Throwing from the construct trap.

function TestConstructThrow(trap) {
  TestConstructThrow2(Proxy.createFunction({ fix: function() {return {};} },
                                           trap))
  TestConstructThrow2(Proxy.createFunction({ fix: function() {return {};} },
                                           function() {},
                                           trap))
}

function TestConstructThrow2(f) {
  assertThrows(function(){ new f(11) }, "myexn")
  Object.freeze(f)
  assertThrows(function(){ new f(11) }, "myexn")
}

TestConstructThrow(function() { throw "myexn" })
TestConstructThrow(Proxy.createFunction({}, function() { throw "myexn" }))
TestConstructThrow(CreateFrozen({}, function() { throw "myexn" }))



// Using function proxies as getters and setters.

var value
var receiver

function TestAccessorCall(getterCallTrap, setterCallTrap) {
  var handler = { fix: function() { return {} } }
  var pgetter = Proxy.createFunction(handler, getterCallTrap)
  var psetter = Proxy.createFunction(handler, setterCallTrap)

  var o = {}
  var oo = Object.create(o)
  Object.defineProperty(o, "a", {get: pgetter, set: psetter})
  Object.defineProperty(o, "b", {get: pgetter})
  Object.defineProperty(o, "c", {set: psetter})
  Object.defineProperty(o, "3", {get: pgetter, set: psetter})
  Object.defineProperty(oo, "a", {value: 43})

  receiver = ""
  assertEquals(42, o.a)
  assertSame(o, receiver)
  receiver = ""
  assertEquals(42, o.b)
  assertSame(o, receiver)
  receiver = ""
  assertEquals(undefined, o.c)
  assertEquals("", receiver)
  receiver = ""
  assertEquals(42, o["a"])
  assertSame(o, receiver)
  receiver = ""
  assertEquals(42, o[3])
  assertSame(o, receiver)

  receiver = ""
  assertEquals(43, oo.a)
  assertEquals("", receiver)
  receiver = ""
  assertEquals(42, oo.b)
  assertSame(o, receiver)
  receiver = ""
  assertEquals(undefined, oo.c)
  assertEquals("", receiver)
  receiver = ""
  assertEquals(43, oo["a"])
  assertEquals("", receiver)
  receiver = ""
  assertEquals(42, oo[3])
  assertSame(o, receiver)

  receiver = ""
  assertEquals(50, o.a = 50)
  assertSame(o, receiver)
  assertEquals(50, value)
  receiver = ""
  assertEquals(51, o.b = 51)
  assertEquals("", receiver)
  assertEquals(50, value)  // no setter
  assertThrows(function() { "use strict"; o.b = 51 }, TypeError)
  receiver = ""
  assertEquals(52, o.c = 52)
  assertSame(o, receiver)
  assertEquals(52, value)
  receiver = ""
  assertEquals(53, o["a"] = 53)
  assertSame(o, receiver)
  assertEquals(53, value)
  receiver = ""
  assertEquals(54, o[3] = 54)
  assertSame(o, receiver)
  assertEquals(54, value)

  value = 0
  receiver = ""
  assertEquals(60, oo.a = 60)
  assertEquals("", receiver)
  assertEquals(0, value)  // oo has own 'a'
  assertEquals(61, oo.b = 61)
  assertSame("", receiver)
  assertEquals(0, value)  // no setter
  assertThrows(function() { "use strict"; oo.b = 61 }, TypeError)
  receiver = ""
  assertEquals(62, oo.c = 62)
  assertSame(oo, receiver)
  assertEquals(62, value)
  receiver = ""
  assertEquals(63, oo["c"] = 63)
  assertSame(oo, receiver)
  assertEquals(63, value)
  receiver = ""
  assertEquals(64, oo[3] = 64)
  assertSame(oo, receiver)
  assertEquals(64, value)
}

TestAccessorCall(
  function() { receiver = this; return 42 },
  function(x) { receiver = this; value = x }
)

TestAccessorCall(
  function() { "use strict"; receiver = this; return 42 },
  function(x) { "use strict"; receiver = this; value = x }
)

TestAccessorCall(
  Proxy.createFunction({}, function() { receiver = this; return 42 }),
  Proxy.createFunction({}, function(x) { receiver = this; value = x })
)

TestAccessorCall(
  CreateFrozen({}, function() { receiver = this; return 42 }),
  CreateFrozen({}, function(x) { receiver = this; value = x })
)