v8/test/mjsunit/object-create.js
2009-12-09 13:56:58 +00:00

251 lines
7.8 KiB
JavaScript

// Copyright 2009 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.
// Test ES5 sections 15.2.3.5 Object.create.
// We do not support nonconfigurable properties on objects so that is not
// tested. We do test getters, setters, writable, enumerable and value.
// Check that no exceptions are thrown.
Object.create(null);
Object.create(null, undefined);
// Check that the right exception is thrown.
try {
Object.create(4);
assertTrue(false);
} catch (e) {
assertTrue(/Object or null/.test(e));
}
try {
Object.create("foo");
print(2);
assertTrue(false);
} catch (e) {
assertTrue(/Object or null/.test(e));
}
var ctr = 0;
var ctr2 = 0;
var ctr3 = 0;
var ctr4 = 0;
var ctr5 = 0;
var ctr6 = 1000;
var protoFoo = { foo: function() { ctr++; }};
var fooValue = { foo: { writable: true, value: function() { ctr2++; }}};
var fooGetter = { foo: { get: function() { return ctr3++; }}};
var fooSetter = { foo: { set: function() { return ctr4++; }}};
var fooAmbiguous = { foo: { get: function() { return ctr3++; },
value: 3 }};
function valueGet() { ctr5++; return 3 };
function getterGet() { ctr5++; return function() { return ctr6++; }; };
// Simple object with prototype, no properties added.
Object.create(protoFoo).foo();
assertEquals(1, ctr);
// Simple object with object with prototype, no properties added.
Object.create(Object.create(protoFoo)).foo();
assertEquals(2, ctr);
// Add a property foo that returns a function.
var v = Object.create(protoFoo, fooValue);
v.foo();
assertEquals(2, ctr);
assertEquals(1, ctr2);
// Ensure the property is writable.
v.foo = 42;
assertEquals(42, v.foo);
assertEquals(2, ctr);
assertEquals(1, ctr2);
// Ensure by default properties are not writable.
v = Object.create(null, { foo: {value: 103}});
assertEquals(103, v.foo);
v.foo = 42;
assertEquals(103, v.foo);
// Add a getter foo that returns a counter value.
assertEquals(0, Object.create(protoFoo, fooGetter).foo);
assertEquals(2, ctr);
assertEquals(1, ctr2);
assertEquals(1, ctr3);
// Add a setter foo that runs a function.
assertEquals(1, Object.create(protoFoo, fooSetter).foo = 1);
assertEquals(2, ctr);
assertEquals(1, ctr2);
assertEquals(1, ctr3);
assertEquals(1, ctr4);
// Make sure that trying to add both a value and a getter
// will result in an exception.
try {
Object.create(protoFoo, fooAmbiguous);
assertTrue(false);
} catch (e) {
assertTrue(/Invalid property/.test(e));
}
assertEquals(2, ctr);
assertEquals(1, ctr2);
assertEquals(1, ctr3);
assertEquals(1, ctr4);
var ctr7 = 0;
var metaProps = {
enumerable: { get: function() {
assertEquals(0, ctr7++);
return true;
}},
configurable: { get: function() {
assertEquals(1, ctr7++);
return true;
}},
value: { get: function() {
assertEquals(2, ctr7++);
return 4;
}},
writable: { get: function() {
assertEquals(3, ctr7++);
return true;
}},
get: { get: function() {
assertEquals(4, ctr7++);
return function() { };
}},
set: { get: function() {
assertEquals(5, ctr7++);
return function() { };
}}
};
// Instead of a plain props object, let's use getters to return its properties.
var magicValueProps = { foo: Object.create(null, { value: { get: valueGet }})};
var magicGetterProps = { foo: Object.create(null, { get: { get: getterGet }})};
var magicAmbiguousProps = { foo: Object.create(null, metaProps) };
assertEquals(3, Object.create(null, magicValueProps).foo);
assertEquals(1, ctr5);
assertEquals(1000, Object.create(null, magicGetterProps).foo);
assertEquals(2, ctr5);
// See if we do the steps in ToPropertyDescriptor in the right order.
// We shouldn't throw the exception for an ambiguous properties object
// before we got all the values out.
try {
Object.create(null, magicAmbiguousProps);
assertTrue(false);
} catch (e) {
assertTrue(/Invalid property/.test(e));
assertEquals(6, ctr7);
}
var magicWritableProps = {
foo: Object.create(null, { value: { value: 4 },
writable: { get: function() {
ctr6++;
return false;
}}})};
var fooNotWritable = Object.create(null, magicWritableProps)
assertEquals(1002, ctr6);
assertEquals(4, fooNotWritable.foo);
fooNotWritable.foo = 5;
assertEquals(4, fooNotWritable.foo);
// Test enumerable flag.
var fooNotEnumerable =
Object.create({fizz: 14}, {foo: {value: 3, enumerable: false},
bar: {value: 4, enumerable: true},
baz: {value: 5}});
var sum = 0;
for (x in fooNotEnumerable) {
assertTrue(x === 'bar' || x === 'fizz');
sum += fooNotEnumerable[x];
}
assertEquals(18, sum);
try {
Object.create(null, {foo: { get: 0 }});
assertTrue(false);
} catch (e) {
assertTrue(/Getter must be a function/.test(e));
}
try {
Object.create(null, {foo: { set: 0 }});
assertTrue(false);
} catch (e) {
assertTrue(/Setter must be a function/.test(e));
}
try {
Object.create(null, {foo: { set: 0, get: 0 }});
assertTrue(false);
} catch (e) {
assertTrue(/Getter must be a function/.test(e));
}
// Ensure that only enumerable own properties on the descriptor are used.
var tricky = Object.create(
{ foo: { value: 1, enumerable: true }},
{ bar: { value: { value: 2, enumerable: true }, enumerable: false },
baz: { value: { value: 4, enumerable: false }, enumerable: true },
fizz: { value: { value: 8, enumerable: false }, enumerable: false },
buzz: { value: { value: 16, enumerable: true }, enumerable: true }});
assertEquals(1, tricky.foo.value);
assertEquals(2, tricky.bar.value);
assertEquals(4, tricky.baz.value);
assertEquals(8, tricky.fizz.value);
assertEquals(16, tricky.buzz.value);
var sonOfTricky = Object.create(null, tricky);
assertFalse("foo" in sonOfTricky);
assertFalse("bar" in sonOfTricky);
assertTrue("baz" in sonOfTricky);
assertFalse("fizz" in sonOfTricky);
assertTrue("buzz" in sonOfTricky);
var sum = 0;
for (x in sonOfTricky) {
assertTrue(x === 'buzz');
sum += sonOfTricky[x];
}
assertEquals(16, sum);