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LibRegex: Implement an ECMA262 Regex quirk with negative lookarounds

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This implements the quirk defined by "Note 3" in section "Canonicalize"
(https://tc39.es/ecma262/#sec-runtime-semantics-canonicalize-ch).

Crosses off another quirk from #6042.
This commit is contained in:
Ali Mohammad Pur 2022-01-21 14:30:47 +03:30 • committed by Ali Mohammad Pur
parent bfe8f312f3
commit c11be92e23
4 changed files with 54 additions and 16 deletions
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15
Userland/Libraries/LibRegex/RegexMatcher.cpp
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@ -486,7 +486,14 @@ Optional<bool> Matcher<Parser>::execute(MatchInput const& input, MatchState& sta
return true;
case ExecutionResult::Failed:
if (!states_to_try_next.is_empty()) {
state = states_to_try_next.take_last();
auto next_state = states_to_try_next.take_last();
// Note: ECMA262 quirk: Note 3, https://tc39.es/ecma262/#sec-runtime-semantics-canonicalize-ch
// capture groups defined in lookarounds "leak" outside the regex,
// but their contents are empty if the lookaround fails.
// This is done by manually clearing the groups where needed, and leaking their contents here.
if constexpr (IsSame<Parser, ECMA262>)
swap(next_state.capture_group_matches, state.capture_group_matches);
state = move(next_state);
continue;
}
return false;
@ -496,7 +503,11 @@ Optional<bool> Matcher<Parser>::execute(MatchInput const& input, MatchState& sta
return {};
return false;
}
state = states_to_try_next.take_last();
auto next_state = states_to_try_next.take_last();
// See note above about an ECMA262 quirk.
if constexpr (IsSame<Parser, ECMA262>)
swap(next_state.capture_group_matches, state.capture_group_matches);
state = move(next_state);
++recursion_level;
continue;
}