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LibJS: Add spec comments to bitwise_xor()

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Linus Groh 2022-12-10 00:05:36 +00:00
parent 07f9ae908c
commit f0f2dd5850
1 changed files with 19 additions and 1 deletions
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20
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -1375,11 +1375,24 @@ ThrowCompletionOr<Value> bitwise_or(VM& vm, Value lhs, Value rhs)
}
// 13.12 Binary Bitwise Operators, https://tc39.es/ecma262/#sec-binary-bitwise-operators
// BitwiseXORExpression : BitwiseXORExpression ^ BitwiseANDExpression
ThrowCompletionOr<Value> bitwise_xor(VM& vm, Value lhs, Value rhs)
{
// 13.15.3 ApplyStringOrNumericBinaryOperator ( lval, opText, rval ), https://tc39.es/ecma262/#sec-applystringornumericbinaryoperator
// 1-2, 6. N/A.
// 3. Let lnum be ? ToNumeric(lval).
auto lhs_numeric = TRY(lhs.to_numeric(vm));
// 4. Let rnum be ? ToNumeric(rval).
auto rhs_numeric = TRY(rhs.to_numeric(vm));
// 7. Let operation be the abstract operation associated with opText and Type(lnum) in the following table:
// [...]
// 8. Return operation(lnum, rnum).
if (both_number(lhs_numeric, rhs_numeric)) {
// 6.1.6.1.18 Number::bitwiseXOR ( x, y ), https://tc39.es/ecma262/#sec-numeric-types-number-bitwiseXOR
// 1. Return NumberBitwiseOp(^, x, y).
if (!lhs_numeric.is_finite_number() && !rhs_numeric.is_finite_number())
return Value(0);
if (!lhs_numeric.is_finite_number())
@ -1388,8 +1401,13 @@ ThrowCompletionOr<Value> bitwise_xor(VM& vm, Value lhs, Value rhs)
return lhs_numeric;
return Value(TRY(lhs_numeric.to_i32(vm)) ^ TRY(rhs_numeric.to_i32(vm)));
}
if (both_bigint(lhs_numeric, rhs_numeric))
if (both_bigint(lhs_numeric, rhs_numeric)) {
// 6.1.6.2.19 BigInt::bitwiseXOR ( x, y ), https://tc39.es/ecma262/#sec-numeric-types-bigint-bitwiseXOR
// 1. Return BigIntBitwiseOp(^, x, y).
return BigInt::create(vm, lhs_numeric.as_bigint().big_integer().bitwise_xor(rhs_numeric.as_bigint().big_integer()));
}
// 5. If Type(lnum) is different from Type(rnum), throw a TypeError exception.
return vm.throw_completion<TypeError>(ErrorType::BigIntBadOperatorOtherType, "bitwise XOR");
}