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LibJS: Disallow numerical separators in octal numbers and after '.'

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davidot 2021-11-26 18:30:42 +01:00 committed by Linus Groh
parent 32016d3924
commit afde1821b5
Notes: sideshowbarker 2024-07-17 23:18:56 +09:00 
Author: https://github.com/davidot
Commit: https://github.com/SerenityOS/serenity/commit/afde1821b50
Pull-request: https://github.com/SerenityOS/serenity/pull/11088
Issue: https://github.com/SerenityOS/serenity/issues/11078
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/linusg ✅
2 changed files with 34 additions and 4 deletions
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12
Userland/Libraries/LibJS/Lexer.cpp
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@ -654,7 +654,7 @@ Token Lexer::next()
if (m_current_char == '.') {
// decimal
consume();
while (is_ascii_digit(m_current_char) || match_numeric_literal_separator_followed_by(is_ascii_digit))
while (is_ascii_digit(m_current_char))
consume();
if (m_current_char == 'e' || m_current_char == 'E')
is_invalid_numeric_literal = !consume_exponent();
@ -688,7 +688,7 @@ Token Lexer::next()
// octal without '0o' prefix. Forbidden in 'strict mode'
do {
consume();
} while (is_ascii_digit(m_current_char) || match_numeric_literal_separator_followed_by(is_ascii_digit));
} while (is_ascii_digit(m_current_char));
}
} else {
// 1...9 or period
@ -700,11 +700,15 @@ Token Lexer::next()
} else {
if (m_current_char == '.') {
consume();
while (is_ascii_digit(m_current_char) || match_numeric_literal_separator_followed_by(is_ascii_digit))
if (m_current_char == '_')
is_invalid_numeric_literal = true;
while (is_ascii_digit(m_current_char) || match_numeric_literal_separator_followed_by(is_ascii_digit)) {
consume();
}
}
if (m_current_char == 'e' || m_current_char == 'E')
is_invalid_numeric_literal = !consume_exponent();
is_invalid_numeric_literal = is_invalid_numeric_literal || !consume_exponent();
}
}
if (is_invalid_numeric_literal) {

26
Userland/Libraries/LibJS/Tests/syntax/numeric-separator.js Normal file
View file

@ -0,0 +1,26 @@
describe("numeric separators", () => {
test("numeric separator works for 'normal' number", () => {
expect("1_2").toEvalTo(12);
expect("4_2.4_2").toEvalTo(42.42);
expect("1_2e0_2").toEvalTo(1200);
expect("1_2E+_1").not.toEval();
expect("1_2E+0_1").toEvalTo(120);
});
test("cannot use numeric separator after .", () => {
expect("4._3").not.toEval();
expect("0._3").not.toEval();
expect("1_.3._3").not.toEval();
// Actually a valid attempt to get property '_3' on 1.3 which fails but does parse.
expect("1.3._3").toEval();
});
test("cannot use numeric separator in octal escaped number", () => {
expect("00_1").not.toEval();
expect("01_1").not.toEval();
expect("07_3").not.toEval();
expect("00_1").not.toEval();
});
});