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LibRegex: Treat \<ORD_CHAR> as unescaped in POSIX BRE/ERE

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This is undefined according to the spec, but glibc ignores the backslash
and some applications seem to prefer this behaviour (e.g. sed).
This commit is contained in:
Ali Mohammad Pur 2023-06-12 20:00:19 +03:30 • committed by Andreas Kling
parent ce186dca70
commit cdec23a68c
1 changed files with 25 additions and 2 deletions
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27
Userland/Libraries/LibRegex/RegexParser.cpp
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@ -205,7 +205,7 @@ ALWAYS_INLINE bool Parser::match_ordinary_characters()
// NOTE: This method must not be called during bracket and repetition parsing!
// FIXME: Add assertion for that?
auto type = m_parser_state.current_token.type();
return (type == TokenType::Char
return ((type == TokenType::Char && m_parser_state.current_token.value() != "\\"sv) // NOTE: Backslash will only be matched as 'char' if it does not form a valid escape.
|| type == TokenType::Comma
|| type == TokenType::Slash
|| type == TokenType::EqualSign
@ -529,8 +529,23 @@ bool PosixBasicParser::parse_one_char_or_collation_element(ByteCode& bytecode, s
back(2);
}
if (match(TokenType::Char)) {
auto ch = consume().value()[0];
if (ch == '\\') {
if (m_parser_state.regex_options.has_flag_set(AllFlags::Extra))
return set_error(Error::InvalidPattern);
// This was \<ORD_CHAR>, the spec does not define any behaviour for this but glibc regex ignores it - and so do we.
return true;
}
bytecode.insert_bytecode_compare_values({ { CharacterCompareType::Char, (ByteCodeValueType)ch } });
match_length_minimum += 1;
return true;
}
// None of these are special in BRE.
if (match(TokenType::Char) || match(TokenType::Questionmark) || match(TokenType::RightParen) || match(TokenType::HyphenMinus)
if (match(TokenType::Questionmark) || match(TokenType::RightParen) || match(TokenType::HyphenMinus)
|| match(TokenType::Circumflex) || match(TokenType::RightCurly) || match(TokenType::Comma) || match(TokenType::Colon)
|| match(TokenType::Dollar) || match(TokenType::EqualSign) || match(TokenType::LeftCurly) || match(TokenType::LeftParen)
|| match(TokenType::Pipe) || match(TokenType::Slash) || match(TokenType::RightBracket) || match(TokenType::RightParen)) {
@ -721,6 +736,14 @@ ALWAYS_INLINE bool PosixExtendedParser::parse_sub_expression(ByteCode& stack, si
break;
}
if (m_parser_state.current_token.value() == "\\"sv) {
if (m_parser_state.regex_options.has_flag_set(AllFlags::Extra))
return set_error(Error::InvalidPattern);
consume();
continue;
}
if (match_repetition_symbol())
return set_error(Error::InvalidRepetitionMarker);