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LibJS: Implement BigInt IsLessThan according to the spec

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Timothy Flynn 2022-01-31 10:59:53 -05:00 committed by Linus Groh
parent 9ad3debf35
commit 02b7bf34c9
Notes: sideshowbarker 2024-07-17 19:55:25 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/02b7bf34c99
Pull-request: https://github.com/SerenityOS/serenity/pull/12228
Reviewed-by: https://github.com/linusg ✅
2 changed files with 74 additions and 18 deletions
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28
Userland/Libraries/LibJS/Runtime/Value.cpp
View File

@ -48,14 +48,6 @@ static inline bool same_type_for_equality(const Value& lhs, const Value& rhs)
static const Crypto::SignedBigInteger BIGINT_ZERO { 0 };
static bool is_valid_bigint_value(StringView string)
{
string = string.trim_whitespace();
if (string.length() > 1 && (string[0] == '-' || string[0] == '+'))
string = string.substring_view(1, string.length() - 1);
return all_of(string, [](auto ch) { return isdigit(ch); });
}
ALWAYS_INLINE bool both_number(const Value& lhs, const Value& rhs)
{
return lhs.is_number() && rhs.is_number();
@ -1513,23 +1505,23 @@ ThrowCompletionOr<TriState> is_less_than(GlobalObject& global_object, bool left_
}
if (x_primitive.is_bigint() && y_primitive.is_string()) {
auto& y_string = y_primitive.as_string().string();
if (!is_valid_bigint_value(y_string))
auto y_bigint = y_primitive.string_to_bigint(global_object);
if (!y_bigint.has_value())
return TriState::Unknown;
if (x_primitive.as_bigint().big_integer() < Crypto::SignedBigInteger::from_base(10, y_string))
if (x_primitive.as_bigint().big_integer() < (*y_bigint)->big_integer())
return TriState::True;
else
return TriState::False;
return TriState::False;
}
if (x_primitive.is_string() && y_primitive.is_bigint()) {
auto& x_string = x_primitive.as_string().string();
if (!is_valid_bigint_value(x_string))
auto x_bigint = x_primitive.string_to_bigint(global_object);
if (!x_bigint.has_value())
return TriState::Unknown;
if (Crypto::SignedBigInteger::from_base(10, x_string) < y_primitive.as_bigint().big_integer())
if ((*x_bigint)->big_integer() < y_primitive.as_bigint().big_integer())
return TriState::True;
else
return TriState::False;
return TriState::False;
}
auto x_numeric = TRY(x_primitive.to_numeric(global_object));

64
Userland/Libraries/LibJS/Tests/builtins/BigInt/bigint-basic.js
View File

@ -129,6 +129,70 @@ describe("correct behavior", () => {
expect(a === a).toBeTrue();
expect(a === b).toBeFalse();
});
test("less-than operators", () => {
expect(1n < 1n).toBeFalse();
expect(1n < 1).toBeFalse();
expect(1 < 1n).toBeFalse();
expect(1n < 2n).toBeTrue();
expect(1n < 2).toBeTrue();
expect(1 < 2n).toBeTrue();
expect(1n < 1.23).toBeTrue();
expect(1.23 < 1n).toBeFalse();
expect(1n <= 1n).toBeTrue();
expect(1n <= 1).toBeTrue();
expect(1 <= 1n).toBeTrue();
expect(1n <= 2n).toBeTrue();
expect(1n <= 2).toBeTrue();
expect(1 <= 2n).toBeTrue();
expect(1n <= 1.23).toBeTrue();
expect(1.23 <= 1n).toBeFalse();
expect(1n < "1").toBeFalse();
expect(1n < "2").toBeTrue();
expect(1n < "1.23").toBeFalse();
expect(1n <= "1").toBeTrue();
expect(1n <= "2").toBeTrue();
expect(1n <= "1.23").toBeFalse();
expect(1n < "0b1").toBeFalse();
expect(1n < "0B10").toBeTrue();
expect(1n < "0o1").toBeFalse();
expect(1n < "0O2").toBeTrue();
expect(1n < "0x1").toBeFalse();
expect(1n < "0X2").toBeTrue();
expect(1n <= "0b1").toBeTrue();
expect(1n <= "0B10").toBeTrue();
expect(1n <= "0o1").toBeTrue();
expect(1n <= "0O2").toBeTrue();
expect(1n <= "0x1").toBeTrue();
expect(1n <= "0X2").toBeTrue();
expect("1" < 1n).toBeFalse();
expect("1" < 2n).toBeTrue();
expect("1.23" < 1n).toBeFalse();
expect("1" <= 1n).toBeTrue();
expect("1" <= 2n).toBeTrue();
expect("1.23" <= 1n).toBeFalse();
expect("0b1" < 1n).toBeFalse();
expect("0B1" < 2n).toBeTrue();
expect("0o1" < 1n).toBeFalse();
expect("0O1" < 2n).toBeTrue();
expect("0x1" < 1n).toBeFalse();
expect("0X1" < 2n).toBeTrue();
expect("0b1" <= 1n).toBeTrue();
expect("0B10" <= 2n).toBeTrue();
expect("0o1" <= 1n).toBeTrue();
expect("0O2" <= 2n).toBeTrue();
expect("0x1" <= 1n).toBeTrue();
expect("0X2" <= 2n).toBeTrue();
});
});
describe("errors", () => {