v8/test/mjsunit/es6/proxies-apply.js

// Copyright 2015 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.

(function testNonCallable() {
  var proxy = new Proxy({},{});
  assertThrows(function(){ proxy() }, TypeError);

  var proxy2 = new Proxy(proxy, {});
  assertThrows(function(){ proxy2() }, TypeError);
})();

(function testCallProxyFallbackNoArguments() {
  var called = false;
  var target = function() {
    called = true;
  }
  var proxy = new Proxy(target, {});
  assertFalse(called);
  proxy();
  assertTrue(called);

  called = false;
  var proxy2 = new Proxy(proxy, {});
  assertFalse(called);
  proxy2();
  assertTrue(called);
})();

(function testCallProxyFallback1Argument() {
  var called = false;
  var target = function(a) {
    called = true;
    assertEquals('1', a);
  }
  var proxy = new Proxy(target, {});
  assertFalse(called);
  proxy('1');
  assertTrue(called);
})();

(function testCallProxyFallback2Arguments() {
  var called = false;
  var target = function(a, b) {
    called = true;
    assertEquals('1', a);
    assertEquals('2', b);
  }
  var proxy = new Proxy(target, {});
  assertFalse(called);
  proxy('1', '2');
  assertTrue(called);
})();

(function testCallProxyFallbackChangedReceiver() {
  var apply_receiver = {receiver:true};
  var seen_receiver = undefined;
  var target = function() {
    seen_receiver = this;
  }
  var proxy = new Proxy(target, {});
  assertEquals(undefined, seen_receiver);
  Reflect.apply(proxy, apply_receiver, [1,2,3,4]);
  assertSame(apply_receiver, seen_receiver);
})();

(function testCallProxyTrap() {
  var called_target = false;
  var called_handler = false;
  var target = function(a, b) {
    called_target = true;
    assertEquals(1, a);
    assertEquals(2, b);
  }
  var handler = {
    apply: function(target, this_arg, args) {
      target.apply(this_arg, args);
      called_handler = true;
    }
  }
  var proxy = new Proxy(target, handler);
  assertFalse(called_target);
  assertFalse(called_handler);
  Reflect.apply(proxy, {rec:1}, [1,2]);
  assertTrue(called_target);
  assertTrue(called_handler);
})();

(function testCallProxyTrapArrayArg() {
  var called_target = false;
  var called_handler = false;
  var target = function(a, b) {
    called_target = true;
    assertArrayEquals([1, 2], a);
    assertEquals(3, b);
  }
  var handler = {
    apply: function(target, this_arg, args) {
      target.apply(this_arg, args);
      called_handler = true;
    }
  }
  var proxy = new Proxy(target, handler);
  assertFalse(called_target);
  assertFalse(called_handler);
  proxy([1,2], 3);
  assertTrue(called_target);
  assertTrue(called_handler);
})();

(function testCallProxyTrapObjectArg() {
  var called_target = false;
  var called_handler = false;
  var target = function(o) {
    called_target = true;
    assertEquals({a: 1, b: 2}, o);
  }
  var handler = {
    apply: function(target, this_arg, args) {
      target.apply(this_arg, args);
      called_handler = true;
    }
  }
  var proxy = new Proxy(target, handler);
  assertFalse(called_target);
  assertFalse(called_handler);
  proxy({a: 1, b: 2});
  assertTrue(called_target);
  assertTrue(called_handler);
})();

(function testCallProxyTrapGeneratorArg() {
  function* gen() {
    yield 1;
    yield 2;
    yield 3;
  }
  var called_target = false;
  var called_handler = false;
  var target = function(g) {
    called_target = true;
    assertArrayEquals([1,2,3], [...g]);
  }
  var handler = {
    apply: function(target, this_arg, args) {
      target.apply(this_arg, args);
      called_handler = true;
    }
  }
  var proxy = new Proxy(target, handler);
  assertFalse(called_target);
  assertFalse(called_handler);
  proxy(gen());
  assertTrue(called_target);
  assertTrue(called_handler);
})();

(function testProxyTrapContext() {
  var _target, _args, _handler, _context;
  var target = function(a, b) { return a + b; };
  var handler = {
    apply: function(t, c, args) {
        _handler = this;
        _target = t;
        _context = c;
        _args = args;
    }
  };
  var proxy = new Proxy(target, handler);

  var context = {};

  proxy.call(context, 1, 2);

  assertEquals(_handler, handler);
  assertEquals(_target, target);
  assertEquals(_context, context);
  assertEquals(_args.length, 2);
  assertEquals(_args[0], 1);
  assertEquals(_args[1], 2);
})();

(function testCallProxyNonCallableTrap() {
  var called_target = false;
  var target = function() {
    called_target = true;
  };
  var handler = {
    apply: 'non callable trap'
  };

  var proxy = new Proxy(target, handler);
  assertThrows(function(){ proxy() }, TypeError);

  assertFalse(called_target);
})();

(function testCallProxyNullTrap() {
  var _args;
  var target = function(a, b) {
    _args = [a, b];
    return a + b;
  };
  var handler = {
    apply: null
  };

  var proxy = new Proxy(target, handler);
  var result = proxy(1, 2);

  assertEquals(result, 3);
  assertEquals(_args.length, 2);
  assertEquals(_args[0], 1);
  assertEquals(_args[1], 2);
})();

(function testCallProxyNonCallableTarget() {
  var values = [NaN, 1.5, 100, /RegExp/, "string", {}, [], Symbol(),
                new Map(), new Set(), new WeakMap(), new WeakSet()];
  values.forEach(target => {
    target = Object(target);
    var proxy = new Proxy(target, { apply() { assertUnreachable(); } });
    assertThrows(() => { proxy(); }, TypeError);
    assertThrows(() => { ({ proxy }).proxy(); }, TypeError);
    assertThrows(() => { Reflect.apply(proxy, null, []); }, TypeError);
    assertThrows(() => { Reflect.apply(proxy, { proxy }, []); }, TypeError);
    assertThrows(() => {
          Function.prototype.call.apply(proxy, [null]);
        }, TypeError);
    assertThrows(() => {
          Function.prototype.apply.apply(proxy, [null, []]);
        }, TypeError);

    var proxy_to_proxy = new Proxy(proxy, { apply() { assertUnreachable(); } });
    assertThrows(() => { proxy_to_proxy(); }, TypeError);
    assertThrows(() => { ({ proxy_to_proxy }).proxy_to_proxy(); }, TypeError);
    assertThrows(() => { Reflect.apply(proxy_to_proxy, null, []); }, TypeError);
    assertThrows(() => { Reflect.apply(proxy_to_proxy, { proxy }, []); },
                 TypeError);
    assertThrows(() => {
          Function.prototype.call.apply(proxy_to_proxy, [null]);
        }, TypeError);
    assertThrows(() => {
          Function.prototype.apply.apply(proxy_to_proxy, [null, []]);
        }, TypeError);
  });
})();