/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//-----------------------------------------------------------------------------
var BUGNUMBER = 505587;
var summary =
'ES5 Object.getOwnPropertyDescriptor(O)';
var actual =
'';
var expect =
'';
printBugNumber(BUGNUMBER);
printStatus (summary);
/**************
* BEGIN TEST *
**************/
function assertEq(a, e, msg)
{
function SameValue(v1, v2)
{
if (v1 === 0 && v2 === 0)
return 1 / v1 === 1 / v2;
if (v1 !== v1 && v2 !== v2)
return true;
return v1 === v2;
}
if (!SameValue(a, e))
{
var stack =
new Error().stack ||
"";
throw "Assertion failed: got " + a +
", expected " + e +
(msg ?
": " + msg :
"") +
(stack ?
"\nStack:\n" + stack :
"");
}
}
function expectDescriptor(actual, expected)
{
if (actual === undefined && expected === undefined)
return;
assertEq(
typeof actual,
"object");
assertEq(
typeof expected,
"object");
var fields =
{
value:
true,
get:
true,
set:
true,
enumerable:
true,
writable:
true,
configurable:
true
};
for (
var p in fields)
assertEq(actual.hasOwnProperty(p), expected.hasOwnProperty(p), p);
for (
var p in actual)
assertEq(p in fields,
true, p);
for (
var p in expected)
assertEq(p in fields,
true, p);
assertEq(actual.hasOwnProperty(
"value"), actual.hasOwnProperty(
"writable"));
assertEq(actual.hasOwnProperty(
"get"), actual.hasOwnProperty(
"set"));
if (actual.hasOwnProperty(
"value"))
{
assertEq(actual.value, expected.value);
assertEq(actual.writable, expected.writable);
}
else
{
assertEq(actual.get, expected.get);
assertEq(actual.set, expected.set);
}
assertEq(actual.hasOwnProperty(
"enumerable"),
true);
assertEq(actual.hasOwnProperty(
"configurable"),
true);
assertEq(actual.enumerable, expected.enumerable);
assertEq(actual.configurable, expected.configurable);
}
function adjustDescriptorField(o, actual, expect, field)
{
assertEq(field ===
"get" || field ===
"set",
true);
var lookup =
"__lookup" + (field ===
"get" ?
"G" :
"S") +
"etter";
if (
typeof o[lookup] ===
"function")
expect[field] = o[lookup](field);
else
actual[field] = expect[field] = undefined;
/* censor if we can't lookup */
}
/******************************************************************************/
var o, pd, expected;
o = { get x() {
return 12; } };
pd = Object.getOwnPropertyDescriptor(o,
"x");
expected =
{
set: undefined,
enumerable:
true,
configurable:
true
};
adjustDescriptorField(o, pd, expected,
"get");
expectDescriptor(pd, expected);
/******************************************************************************/
var o2;
o = Object.create(Object.prototype, { x: {get:
function () {
return 12; } } });
pd = Object.getOwnPropertyDescriptor(o,
"x");
expected =
{
set: undefined,
enumerable:
false,
configurable:
false
};
adjustDescriptorField(o, pd, expected,
"get");
expectDescriptor(pd, expected);
o2 = Object.create(o);
assertEq(Object.getOwnPropertyDescriptor(o2,
"x"), undefined);
/******************************************************************************/
o = {};
o.b = 12;
pd = Object.getOwnPropertyDescriptor(o,
"b");
expected =
{
value: 12,
writable:
true,
enumerable:
true,
configurable:
true
};
expectDescriptor(pd, expected);
/******************************************************************************/
o = { get y() {
return 17; }, set y(z) { } };
pd = Object.getOwnPropertyDescriptor(o,
"y");
expected =
{
enumerable:
true,
configurable:
true
};
adjustDescriptorField(o, pd, expected,
"get");
adjustDescriptorField(o, pd, expected,
"set");
expectDescriptor(pd, expected);
/******************************************************************************/
o = {};
pd = Object.getOwnPropertyDescriptor(o,
"absent");
expectDescriptor(pd, undefined);
/******************************************************************************/
pd = Object.getOwnPropertyDescriptor([],
"length");
expected =
{
value: 0,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
pd = Object.getOwnPropertyDescriptor([1],
"length");
expected =
{
value: 1,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
pd = Object.getOwnPropertyDescriptor([1,],
"length");
expected =
{
value: 1,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
pd = Object.getOwnPropertyDescriptor([1,,],
"length");
expected =
{
value: 2,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
/******************************************************************************/
pd = Object.getOwnPropertyDescriptor(
new String(
"foobar"),
"length");
expected =
{
value: 6,
writable:
false,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
/******************************************************************************/
function foo() { }
o = foo;
pd = Object.getOwnPropertyDescriptor(o,
"length");
expected =
{
value: 0,
writable:
false,
enumerable:
false,
configurable:
true
};
expectDescriptor(pd, expected);
pd = Object.getOwnPropertyDescriptor(o,
"prototype");
expected =
{
value: foo.prototype,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
/******************************************************************************/
pd = Object.getOwnPropertyDescriptor(
Function,
"length");
expected =
{
value: 1,
writable:
false,
enumerable:
false,
configurable:
true
};
expectDescriptor(pd, expected);
/******************************************************************************/
o = /foo/im;
pd = Object.getOwnPropertyDescriptor(o,
"lastIndex");
expected =
{
value: 0,
writable:
true,
enumerable:
false,
configurable:
false
};
expectDescriptor(pd, expected);
/******************************************************************************/
reportCompare(expect, actual,
"Object.getOwnPropertyDescriptor");
printStatus(
"All tests passed");
