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LibRegex: Implement ECMA262 multiline matching without splitting lines

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As ECMA262 regex allows `[^]` and literal newlines to match newlines in
the input string, we shouldn't split the input string into lines, rather
simply make boundaries and catchall patterns capable of checking for
these conditions specifically.
This commit is contained in:
Ali Mohammad Pur 2022-01-25 13:30:27 +03:30 • committed by Ali Mohammad Pur
parent 98183ef572
commit 5fac41f733
7 changed files with 55 additions and 20 deletions
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2
Userland/Libraries/LibC/regex.h
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@ -83,6 +83,7 @@ enum __RegexAllFlags {
__Regex_SkipTrimEmptyMatches = __Regex_Global << 13, // Do not remove empty capture group results.
__Regex_Internal_Stateful = __Regex_Global << 14, // Internal flag; enables stateful matches.
__Regex_Internal_BrowserExtended = __Regex_Global << 15, // Internal flag; enable browser-specific ECMA262 extensions.
__Regex_Internal_ConsiderNewline = __Regex_Global << 16, // Internal flag; allow matchers to consider newlines as line separators.
__Regex_Last = __Regex_SkipTrimEmptyMatches
};
@ -97,7 +98,6 @@ enum __RegexAllFlags {
#define REG_NOTBOL __Regex_MatchNotBeginOfLine // The circumflex character (^), when taken as a special character, will not match the beginning of string.
#define REG_NOTEOL __Regex_MatchNotEndOfLine // The dollar sign ($), when taken as a special character, will not match the end of string.
//static_assert (sizeof(FlagsUnderlyingType) * 8 >= regex::POSIXFlags::Last << 1), "flags type too small")
#define REG_SEARCH __Regex_Last << 1
int regcomp(regex_t*, const char*, int);