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LibRegex: Allow references to capture groups that aren't parsed yet

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This only applies to the ECMA262 parser.
This behaviour is an ECMA262-specific quirk, such references always
generate zero-length matches (even on subsequent passes).
Also adds a test in LibJS's test suite.

Fixes #6039.
This commit is contained in:
AnotherTest 2021-04-01 18:30:47 +04:30 • committed by Andreas Kling
parent 804ab79995
commit 6bbb26fdaf
6 changed files with 80 additions and 6 deletions
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2
Userland/Libraries/LibRegex/RegexByteCode.h
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@ -768,7 +768,7 @@ public:
private:
ALWAYS_INLINE static void compare_char(const MatchInput& input, MatchState& state, u32 ch1, bool inverse, bool& inverse_matched);
ALWAYS_INLINE static bool compare_string(const MatchInput& input, MatchState& state, const char* str, size_t length);
ALWAYS_INLINE static bool compare_string(const MatchInput& input, MatchState& state, const char* str, size_t length, bool& had_zero_length_match);
ALWAYS_INLINE static void compare_character_class(const MatchInput& input, MatchState& state, CharClass character_class, u32 ch, bool inverse, bool& inverse_matched);
ALWAYS_INLINE static void compare_character_range(const MatchInput& input, MatchState& state, u32 from, u32 to, u32 ch, bool inverse, bool& inverse_matched);
};