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LibJS: Add spec comments to bitwise_and()

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Linus Groh 2022-12-10 00:05:02 +00:00
parent 3a8c704d19
commit 9d3d4a760f
1 changed files with 19 additions and 1 deletions
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20
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -1305,17 +1305,35 @@ ThrowCompletionOr<Value> less_than_equals(VM& vm, Value lhs, Value rhs)
}
// 13.12 Binary Bitwise Operators, https://tc39.es/ecma262/#sec-binary-bitwise-operators
// BitwiseANDExpression : BitwiseANDExpression & EqualityExpression
ThrowCompletionOr<Value> bitwise_and(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)) {
// 6.1.6.1.17 Number::bitwiseAND ( x, y ), https://tc39.es/ecma262/#sec-numeric-types-number-bitwiseAND
// 1. Return NumberBitwiseOp(&, x, y).
if (!lhs_numeric.is_finite_number() || !rhs_numeric.is_finite_number())
return Value(0);
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)) {
// 6.1.6.2.18 BigInt::bitwiseAND ( x, y ), https://tc39.es/ecma262/#sec-numeric-types-bigint-bitwiseAND
// 1. Return BigIntBitwiseOp(&, x, y).
return BigInt::create(vm, lhs_numeric.as_bigint().big_integer().bitwise_and(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 AND");
}