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LibJS: Add support for hex, octal & binary big integer literals

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This commit is contained in:
Idan Horowitz 2021-06-14 02:19:23 +03:00 • committed by Linus Groh
parent 2ad2e055e2
commit 690eb3bb8a
3 changed files with 34 additions and 0 deletions
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10
Userland/Libraries/LibJS/AST.cpp
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@ -1830,6 +1830,16 @@ Value NumericLiteral::execute(Interpreter& interpreter, GlobalObject&) const
Value BigIntLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
Crypto::SignedBigInteger integer;
if (m_value[0] == '0' && m_value.length() >= 3) {
if (m_value[1] == 'x' || m_value[1] == 'X') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base16(m_value.substring(2, m_value.length() - 3)));
} else if (m_value[1] == 'o' || m_value[1] == 'O') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base8(m_value.substring(2, m_value.length() - 3)));
} else if (m_value[1] == 'b' || m_value[1] == 'B') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base2(m_value.substring(2, m_value.length() - 3)));
}
}
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base10(m_value.substring(0, m_value.length() - 1)));
}

12
Userland/Libraries/LibJS/Lexer.cpp
View file

@ -466,12 +466,24 @@ Token Lexer::next()
} else if (m_current_char == 'o' || m_current_char == 'O') {
// octal
is_invalid_numeric_literal = !consume_octal_number();
if (m_current_char == 'n') {
consume();
token_type = TokenType::BigIntLiteral;
}
} else if (m_current_char == 'b' || m_current_char == 'B') {
// binary
is_invalid_numeric_literal = !consume_binary_number();
if (m_current_char == 'n') {
consume();
token_type = TokenType::BigIntLiteral;
}
} else if (m_current_char == 'x' || m_current_char == 'X') {
// hexadecimal
is_invalid_numeric_literal = !consume_hexadecimal_number();
if (m_current_char == 'n') {
consume();
token_type = TokenType::BigIntLiteral;
}
} else if (m_current_char == 'n') {
consume();
token_type = TokenType::BigIntLiteral;

12
Userland/Libraries/LibJS/Tests/builtins/BigInt/bigint-basic.js
View file

@ -7,6 +7,18 @@ describe("correct behavior", () => {
expect("" + 123n).toBe("123");
});
test("hex literals", () => {
expect(0xffn).toBe(255n);
});
test("octal literals", () => {
expect(0o10n).toBe(8n);
});
test("binary literals", () => {
expect(0b10n).toBe(2n);
});
test("arithmetic operators", () => {
let bigint = 123n;
expect(-bigint).toBe(-123n);