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LibJS: Fix typo in LHS Object and RHS BigInt loosely equals check

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Step 12 was using `lhs.is_bigint()` instead of `rhs.is_bigint()`,
meaning you got:
```js
1n == Object(1n); // true
Object(1n) == 1n; // false
```

This also adds spec comments to is_loosely_equal.
This commit is contained in:
Luke Wilde 2021-10-15 01:47:54 +01:00 • committed by Linus Groh
parent 3ad159537e
commit 09536f5f48
2 changed files with 45 additions and 3 deletions
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33
Userland/Libraries/LibJS/Runtime/Value.cpp
View file

@ -1389,53 +1389,79 @@ bool is_loosely_equal(GlobalObject& global_object, Value lhs, Value rhs)
{
auto& vm = global_object.vm();
if (same_type_for_equality(lhs, rhs))
// 1. If Type(x) is the same as Type(y), then
if (same_type_for_equality(lhs, rhs)) {
// a. Return IsStrictlyEqual(x, y).
return is_strictly_equal(lhs, rhs);
}
// 2. If x is null and y is undefined, return true.
// 3. If x is undefined and y is null, return true.
if (lhs.is_nullish() && rhs.is_nullish())
return true;
// B.3.7.2 Changes to IsLooselyEqual, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-aec
// 4. NOTE: This step is replaced in section B.3.6.2.
// B.3.6.2 Changes to IsLooselyEqual, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-aec
// 1. If Type(x) is Object and x has an [[IsHTMLDDA]] internal slot and y is either null or undefined, return true.
if (lhs.is_object() && lhs.as_object().is_htmldda() && rhs.is_nullish())
return true;
// 2. If x is either null or undefined and Type(y) is Object and y has an [[IsHTMLDDA]] internal slot, return true.
if (lhs.is_nullish() && rhs.is_object() && rhs.as_object().is_htmldda())
return true;
// == End of B.3.6.2 ==
// 5. If Type(x) is Number and Type(y) is String, return IsLooselyEqual(x, ! ToNumber(y)).
if (lhs.is_number() && rhs.is_string())
return is_loosely_equal(global_object, lhs, rhs.to_number(global_object));
// 6. If Type(x) is String and Type(y) is Number, return IsLooselyEqual(! ToNumber(x), y).
if (lhs.is_string() && rhs.is_number())
return is_loosely_equal(global_object, lhs.to_number(global_object), rhs);
// 7. If Type(x) is BigInt and Type(y) is String, then
if (lhs.is_bigint() && rhs.is_string()) {
auto& rhs_string = rhs.as_string().string();
// a. Let n be ! StringToBigInt(y).
// b. If n is NaN, return false.
if (!is_valid_bigint_value(rhs_string))
return false;
// c. Return IsLooselyEqual(x, n).
return is_loosely_equal(global_object, lhs, js_bigint(vm, Crypto::SignedBigInteger::from_base(10, rhs_string)));
}
// 8. If Type(x) is String and Type(y) is BigInt, return IsLooselyEqual(y, x).
if (lhs.is_string() && rhs.is_bigint())
return is_loosely_equal(global_object, rhs, lhs);
// 9. If Type(x) is Boolean, return IsLooselyEqual(! ToNumber(x), y).
if (lhs.is_boolean())
return is_loosely_equal(global_object, lhs.to_number(global_object), rhs);
// 10. If Type(y) is Boolean, return IsLooselyEqual(x, ! ToNumber(y)).
if (rhs.is_boolean())
return is_loosely_equal(global_object, lhs, rhs.to_number(global_object));
// 11. If Type(x) is either String, Number, BigInt, or Symbol and Type(y) is Object, return IsLooselyEqual(x, ? ToPrimitive(y)).
if ((lhs.is_string() || lhs.is_number() || lhs.is_bigint() || lhs.is_symbol()) && rhs.is_object()) {
auto rhs_primitive = TRY_OR_DISCARD(rhs.to_primitive(global_object));
return is_loosely_equal(global_object, lhs, rhs_primitive);
}
if (lhs.is_object() && (rhs.is_string() || rhs.is_number() || lhs.is_bigint() || rhs.is_symbol())) {
// 12. If Type(x) is Object and Type(y) is either String, Number, BigInt, or Symbol, return IsLooselyEqual(? ToPrimitive(x), y).
if (lhs.is_object() && (rhs.is_string() || rhs.is_number() || rhs.is_bigint() || rhs.is_symbol())) {
auto lhs_primitive = TRY_OR_DISCARD(lhs.to_primitive(global_object));
return is_loosely_equal(global_object, lhs_primitive, rhs);
}
// 13. If Type(x) is BigInt and Type(y) is Number, or if Type(x) is Number and Type(y) is BigInt, then
if ((lhs.is_bigint() && rhs.is_number()) || (lhs.is_number() && rhs.is_bigint())) {
// a. If x or y are any of NaN, +∞𝔽, or -∞𝔽, return false.
if (lhs.is_nan() || lhs.is_infinity() || rhs.is_nan() || rhs.is_infinity())
return false;
// b. If ℝ(x) = ℝ(y), return true; otherwise return false.
if ((lhs.is_number() && !lhs.is_integral_number()) || (rhs.is_number() && !rhs.is_integral_number()))
return false;
if (lhs.is_number())
@ -1444,6 +1470,7 @@ bool is_loosely_equal(GlobalObject& global_object, Value lhs, Value rhs)
return Crypto::SignedBigInteger { rhs.to_i32(global_object) } == lhs.as_bigint().big_integer();
}
// 14. Return false.
return false;
}