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-// Copyright 2008 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.
-
-/**
- * This test uses assert{True,False}(... == ...) instead of
- * assertEquals(..., ...) to not rely on the details of the
- * implementation of assertEquals.
- */
-
-function testEqual(a, b) {
- assertTrue(a == b);
- assertTrue(b == a);
- assertFalse(a != b);
- assertFalse(b != a);
-}
-
-function testNotEqual(a, b) {
- assertFalse(a == b);
- assertFalse(b == a);
- assertTrue(a != b);
- assertTrue(b != a);
-}
-
-// Object where ToPrimitive returns value.
-function Wrapper(value) {
- this.value = value;
- this.valueOf = function () { return this.value; };
-}
-
-// Object where ToPrimitive returns value by failover to toString when
-// valueOf isn't a function.
-function Wrapper2(value) {
- this.value = value;
- this.valueOf = null;
- this.toString = function () { return this.value; };
-}
-
-
-// Compare values of same type.
-
-// Numbers are equal if same, unless NaN, which isn't equal to anything, and
-// +/-0 being equal.
-
-testNotEqual(NaN, NaN);
-testNotEqual(NaN, 0);
-testNotEqual(NaN, Infinity);
-
-testEqual(Number.MAX_VALUE, Number.MAX_VALUE);
-testEqual(Number.MIN_VALUE, Number.MIN_VALUE);
-testEqual(Infinity, Infinity);
-testEqual(-Infinity, -Infinity);
-
-testEqual(0, 0);
-testEqual(0, -0);
-testEqual(-0, -0);
-
-testNotEqual(0.9, 1);
-testNotEqual(0.999999, 1);
-testNotEqual(0.9999999999, 1);
-testNotEqual(0.9999999999999, 1);
-
-// Strings are equal if containing the same code points.
-
-testEqual('hello', 'hello');
-testEqual('hello', 'hel' + 'lo');
-testEqual('', '');
-testEqual('\u0020\x20', ' '); // Escapes are not part of the value.
-
-// Booleans are equal if they are the same.
-
-testEqual(true, true);
-testEqual(false, false);
-testNotEqual(true, false);
-
-// Null and undefined are equal to themselves.
-
-testEqual(null, null);
-testEqual(undefined, undefined);
-
-// Objects are equal if they are the same object only.
-
-testEqual(Math, Math);
-testEqual(Object.prototype, Object.prototype);
-
-
-(function () {
- var x = new Wrapper(null);
- var y = x, z = x;
- testEqual(y, x);
-})();
-
-(function () {
- var x = new Boolean(true);
- var y = x, z = x;
- testEqual(y, x);
-})();
-
-(function () {
- var x = new Boolean(false);
- var y = x, z = x;
- testEqual(y, x);
-})();
-
-// Test comparing values of different types.
-
-// Null and undefined are equal to each-other, and to nothing else.
-testEqual(null, undefined);
-testEqual(undefined, null);
-
-testNotEqual(null, new Wrapper(null));
-testNotEqual(null, 0);
-testNotEqual(null, false);
-testNotEqual(null, "");
-testNotEqual(null, new Object());
-testNotEqual(undefined, new Wrapper(undefined));
-testNotEqual(undefined, 0);
-testNotEqual(undefined, false);
-testNotEqual(undefined, "");
-testNotEqual(undefined, new Object());
-
-// Numbers compared to Strings will convert the string to a number using
-// the internal ToNumber conversion.
-
-testEqual(1, '1');
-testEqual(255, '0xff');
-testEqual(0, '\r'); // ToNumber ignores tailing and trailing whitespace.
-testEqual(1e19, '1e19');
-testEqual(Infinity, "Infinity");
-
-// Booleans compared to anything else will be converted to numbers.
-testEqual(false, 0);
-testEqual(true, 1);
-testEqual(false, "0"); // String also converted to number.
-testEqual(true, "1");
-
-// Objects compared to Number or String (or Boolean, since that's converted
-// to Number too) is converted to primitive using ToPrimitive with NO HINT.
-// Having no hint means Date gets a string hint, and everything else gets
-// a number hint.
-
-testEqual(new Boolean(true), true);
-testEqual(new Boolean(true), 1); // First to primtive boolean, then to number.
-testEqual(new Boolean(false), false);
-testEqual(new Boolean(false), 0);
-
-testEqual(new Wrapper(true), true);
-testEqual(new Wrapper(true), 1);
-testEqual(new Wrapper(false), false);
-testEqual(new Wrapper(false), 0);
-
-testEqual(new Wrapper2(true), true);
-testEqual(new Wrapper2(true), 1);
-testEqual(new Wrapper2(false), false);
-testEqual(new Wrapper2(false), 0);
-
-testEqual(new Number(1), true);
-testEqual(new Number(1), 1);
-testEqual(new Number(0), false);
-testEqual(new Number(0), 0);
-
-// Date objects convert to string, not number (and the string does not
-// convert to the number).
-testEqual(new Date(42), String(new Date(42)));
-testNotEqual(new Date(42), Number(new Date(42)));
-var dnow = new Date();
-testEqual(dnow, dnow);
-testEqual(dnow, String(dnow));
-testNotEqual(dnow, Number(dnow));
-
-// Doesn't just call toString, but uses ToPrimitive which tries toString first
-// and valueOf second.
-dnow.toString = null;
-testEqual(dnow, Number(dnow));
-dnow.valueOf = function () { return "42"; };
-testEqual(dnow, 42);
-dnow.toString = function () { return "1"; };
-testEqual(dnow, true);
-
-
-// Objects compared to other objects, or to null and undefined, are not
-// converted to primitive.
-testNotEqual(new Wrapper(null), new Wrapper(null));
-testNotEqual(new Boolean(true), new Boolean(true));
-testNotEqual(new Boolean(false), new Boolean(false));
-testNotEqual(new String("a"), new String("a"));
-testNotEqual(new Number(42), new Number(42));
-testNotEqual(new Date(42), new Date(42));
-testNotEqual(new Array(42), new Array(42));
-testNotEqual(new Object(), new Object());
-
-// Object that can't be converted to primitive.
-var badObject = {
- valueOf: null,
- toString: function() {
- return this; // Not primitive.
- }
-};
-
-testEqual(badObject, badObject);
-testNotEqual(badObject, {});
-testNotEqual(badObject, null);
-testNotEqual(badObject, undefined);
-// Forcing conversion will throw.
-function testBadConversion(value) {
- assertThrows(function() { return badObject == value; });
- assertThrows(function() { return badObject != value; });
- assertThrows(function() { return value == badObject; });
- assertThrows(function() { return value != badObject; });
-}
-testBadConversion(0);
-testBadConversion("string");
-testBadConversion(true);