Fix implementation of == to correctly convert Date objects to primitives.
Fix issue 1356 BUG=v8:1356 TEST=mjsunit/double-equals Review URL: http://codereview.chromium.org/6912021 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7761 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
parent
eda2a0d4d2
commit
569574b7bf
@ -49,41 +49,47 @@ const $Function = global.Function;
|
||||
const $Boolean = global.Boolean;
|
||||
const $NaN = 0/0;
|
||||
|
||||
|
||||
// ECMA-262, section 11.9.1, page 55.
|
||||
// ECMA-262 Section 11.9.3.
|
||||
function EQUALS(y) {
|
||||
if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y);
|
||||
var x = this;
|
||||
|
||||
// NOTE: We use iteration instead of recursion, because it is
|
||||
// difficult to call EQUALS with the correct setting of 'this' in
|
||||
// an efficient way.
|
||||
while (true) {
|
||||
if (IS_NUMBER(x)) {
|
||||
if (y == null) return 1; // not equal
|
||||
while (true) {
|
||||
if (IS_NUMBER(y)) return %NumberEquals(x, y);
|
||||
if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
|
||||
if (!IS_SPEC_OBJECT(y)) {
|
||||
// String or boolean.
|
||||
return %NumberEquals(x, %ToNumber(y));
|
||||
}
|
||||
y = %ToPrimitive(y, NO_HINT);
|
||||
}
|
||||
} else if (IS_STRING(x)) {
|
||||
while (true) {
|
||||
if (IS_STRING(y)) return %StringEquals(x, y);
|
||||
if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
|
||||
if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
|
||||
if (y == null) return 1; // not equal
|
||||
if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
|
||||
y = %ToPrimitive(y, NO_HINT);
|
||||
} else if (IS_BOOLEAN(x)) {
|
||||
if (IS_BOOLEAN(y)) {
|
||||
return %_ObjectEquals(x, y) ? 0 : 1;
|
||||
}
|
||||
if (y == null) return 1; // not equal
|
||||
return %NumberEquals(%ToNumber(x), %ToNumber(y));
|
||||
} else if (x == null) {
|
||||
// NOTE: This checks for both null and undefined.
|
||||
return (y == null) ? 0 : 1;
|
||||
} else if (IS_BOOLEAN(x)) {
|
||||
if (IS_BOOLEAN(y)) return %_ObjectEquals(x, y) ? 0 : 1;
|
||||
if (IS_NULL_OR_UNDEFINED(y)) return 1;
|
||||
if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
|
||||
if (IS_STRING(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
|
||||
// y is object.
|
||||
x = %ToNumber(x);
|
||||
y = %ToPrimitive(y, NO_HINT);
|
||||
} else if (IS_NULL_OR_UNDEFINED(x)) {
|
||||
return IS_NULL_OR_UNDEFINED(y) ? 0 : 1;
|
||||
} else {
|
||||
// x is not a number, boolean, null or undefined.
|
||||
if (y == null) return 1; // not equal
|
||||
// x is an object.
|
||||
if (IS_SPEC_OBJECT(y)) {
|
||||
return %_ObjectEquals(x, y) ? 0 : 1;
|
||||
}
|
||||
|
||||
if (IS_NULL_OR_UNDEFINED(y)) return 1; // not equal
|
||||
if (IS_BOOLEAN(y)) y = %ToNumber(y);
|
||||
x = %ToPrimitive(x, NO_HINT);
|
||||
}
|
||||
}
|
||||
|
@ -31,84 +31,206 @@
|
||||
* implementation of assertEquals.
|
||||
*/
|
||||
|
||||
assertTrue (void 0 == void 0, "void 0 == void 0");
|
||||
assertTrue (null == null, "null == null");
|
||||
assertFalse(NaN == NaN, "NaN == NaN");
|
||||
assertFalse(NaN == 0, "NaN == 0");
|
||||
assertFalse(0 == NaN, "0 == NaN");
|
||||
assertFalse(NaN == Infinity, "NaN == Inf");
|
||||
assertFalse(Infinity == NaN, "Inf == NaN");
|
||||
function testEqual(a, b) {
|
||||
assertTrue(a == b);
|
||||
assertTrue(b == a);
|
||||
assertFalse(a != b);
|
||||
assertFalse(b != a);
|
||||
}
|
||||
|
||||
assertTrue(Number.MAX_VALUE == Number.MAX_VALUE, "MAX == MAX");
|
||||
assertTrue(Number.MIN_VALUE == Number.MIN_VALUE, "MIN == MIN");
|
||||
assertTrue(Infinity == Infinity, "Inf == Inf");
|
||||
assertTrue(-Infinity == -Infinity, "-Inf == -Inf");
|
||||
function testNotEqual(a, b) {
|
||||
assertFalse(a == b);
|
||||
assertFalse(b == a);
|
||||
assertTrue(a != b);
|
||||
assertTrue(b != a);
|
||||
}
|
||||
|
||||
assertTrue(0 == 0, "0 == 0");
|
||||
assertTrue(0 == -0, "0 == -0");
|
||||
assertTrue(-0 == 0, "-0 == 0");
|
||||
assertTrue(-0 == -0, "-0 == -0");
|
||||
// Object where ToPrimitive returns value.
|
||||
function Wrapper(value) {
|
||||
this.value = value;
|
||||
this.valueOf = function () { return this.value; };
|
||||
}
|
||||
|
||||
assertFalse(0.9 == 1, "0.9 == 1");
|
||||
assertFalse(0.999999 == 1, "0.999999 == 1");
|
||||
assertFalse(0.9999999999 == 1, "0.9999999999 == 1");
|
||||
assertFalse(0.9999999999999 == 1, "0.9999999999999 == 1");
|
||||
// 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; };
|
||||
}
|
||||
|
||||
assertTrue('hello' == 'hello', "'hello' == 'hello'");
|
||||
|
||||
assertTrue (true == true, "true == true");
|
||||
assertTrue (false == false, "false == false");
|
||||
assertFalse(true == false, "true == false");
|
||||
assertFalse(false == true, "false == true");
|
||||
// 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);
|
||||
|
||||
assertFalse(new Wrapper(null) == new Wrapper(null), "new Wrapper(null) == new Wrapper(null)");
|
||||
assertFalse(new Boolean(true) == new Boolean(true), "new Boolean(true) == new Boolean(true)");
|
||||
assertFalse(new Boolean(false) == new Boolean(false), "new Boolean(false) == new Boolean(false)");
|
||||
|
||||
(function () {
|
||||
var x = new Wrapper(null);
|
||||
var y = x, z = x;
|
||||
assertTrue(y == x);
|
||||
testEqual(y, x);
|
||||
})();
|
||||
|
||||
(function () {
|
||||
var x = new Boolean(true);
|
||||
var y = x, z = x;
|
||||
assertTrue(y == x);
|
||||
testEqual(y, x);
|
||||
})();
|
||||
|
||||
(function () {
|
||||
var x = new Boolean(false);
|
||||
var y = x, z = x;
|
||||
assertTrue(y == x);
|
||||
testEqual(y, x);
|
||||
})();
|
||||
|
||||
assertTrue(null == void 0, "null == void 0");
|
||||
assertTrue(void 0 == null, "void 0 == null");
|
||||
assertFalse(new Wrapper(null) == null, "new Wrapper(null) == null");
|
||||
assertFalse(null == new Wrapper(null), "null == new Wrapper(null)");
|
||||
// Test comparing values of different types.
|
||||
|
||||
assertTrue(1 == '1', "1 == '1");
|
||||
assertTrue(255 == '0xff', "255 == '0xff'");
|
||||
assertTrue(0 == '\r', "0 == '\\r'");
|
||||
assertTrue(1e19 == '1e19', "1e19 == '1e19'");
|
||||
// Null and undefined are equal to each-other, and to nothing else.
|
||||
testEqual(null, undefined);
|
||||
testEqual(undefined, null);
|
||||
|
||||
assertTrue(new Boolean(true) == true, "new Boolean(true) == true");
|
||||
assertTrue(new Boolean(false) == false, "new Boolean(false) == false");
|
||||
assertTrue(true == new Boolean(true), "true == new Boolean(true)");
|
||||
assertTrue(false == new Boolean(false), "false == new Boolean(false)");
|
||||
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());
|
||||
|
||||
assertTrue(Boolean(true) == true, "Boolean(true) == true");
|
||||
assertTrue(Boolean(false) == false, "Boolean(false) == false");
|
||||
assertTrue(true == Boolean(true), "true == Boolean(true)");
|
||||
assertTrue(false == Boolean(false), "false == Boolean(false)");
|
||||
// Numbers compared to Strings will convert the string to a number using
|
||||
// the internal ToNumber conversion.
|
||||
|
||||
assertTrue(new Wrapper(true) == true, "new Wrapper(true) == true");
|
||||
assertTrue(new Wrapper(false) == false, "new Wrapper(false) == false");
|
||||
assertTrue(true == new Wrapper(true), "true = new Wrapper(true)");
|
||||
assertTrue(false == new Wrapper(false), "false = new Wrapper(false)");
|
||||
testEqual(1, '1');
|
||||
testEqual(255, '0xff');
|
||||
testEqual(0, '\r'); // ToNumber ignores tailing and trailing whitespace.
|
||||
testEqual(1e19, '1e19');
|
||||
testEqual(Infinity, "Infinity");
|
||||
|
||||
function Wrapper(value) {
|
||||
this.value = value;
|
||||
this.valueOf = function () { return this.value; };
|
||||
// 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);
|
||||
|
Loading…
Reference in New Issue
Block a user