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LibRegex: Ensure escaped code points are exactly 4 digits in length

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This commit is contained in:
Timothy Flynn 2021-08-11 09:58:08 -04:00 • committed by Linus Groh
parent e887314472
commit 2e4b6fd1ac
3 changed files with 12 additions and 7 deletions
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13
Userland/Libraries/LibRegex/RegexParser.cpp
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@ -1083,7 +1083,7 @@ bool ECMA262Parser::parse_quantifiable_assertion(ByteCode& stack, size_t&, bool
return false;
}
StringView ECMA262Parser::read_digits_as_string(ReadDigitsInitialZeroState initial_zero, bool hex, int max_count)
StringView ECMA262Parser::read_digits_as_string(ReadDigitsInitialZeroState initial_zero, bool hex, int max_count, int min_count)
{
if (!match(TokenType::Char))
return {};
@ -1109,12 +1109,15 @@ StringView ECMA262Parser::read_digits_as_string(ReadDigitsInitialZeroState initi
++count;
}
if (count < min_count)
return {};
return StringView { start_token.value().characters_without_null_termination(), offset };
}
Optional<unsigned> ECMA262Parser::read_digits(ECMA262Parser::ReadDigitsInitialZeroState initial_zero, bool hex, int max_count)
Optional<unsigned> ECMA262Parser::read_digits(ECMA262Parser::ReadDigitsInitialZeroState initial_zero, bool hex, int max_count, int min_count)
{
auto str = read_digits_as_string(initial_zero, hex, max_count);
auto str = read_digits_as_string(initial_zero, hex, max_count, min_count);
if (str.is_empty())
return {};
if (hex)
@ -1483,7 +1486,7 @@ bool ECMA262Parser::parse_atom_escape(ByteCode& stack, size_t& match_length_mini
return false;
}
if (auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 4); code_point.has_value()) {
if (auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 4, 4); code_point.has_value()) {
// In Unicode mode, we need to combine surrogate pairs into a single code point. But we also need to be
// rather forgiving if the surrogate pairs are invalid. So if a second code unit follows this code unit,
// but doesn't form a valid surrogate pair, insert bytecode for both code units individually.
@ -1811,7 +1814,7 @@ bool ECMA262Parser::parse_nonempty_class_ranges(Vector<CompareTypeAndValuePair>&
}
if (try_skip("u")) {
if (auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 4); code_point.has_value()) {
if (auto code_point = read_digits(ReadDigitsInitialZeroState::Allow, true, 4, 4); code_point.has_value()) {
// FIXME: While code point ranges are supported, code point matches as "Char" are not!
return { CharClassRangeElement { .code_point = code_point.value(), .is_character_class = false } };
} else if (!unicode) {