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LibRegex: Account for nested 'or' compare ops

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Closes #6647.
This commit is contained in:
Ali Mohammad Pur
2025-11-01 16:47:57 +01:00
committed by Ali Mohammad Pur
parent 8c9c2ee289
commit 57ef949b61
Notes: github-actions[bot] 2025-11-01 16:50:59 +00:00 
Author: https://github.com/alimpfard
Commit: https://github.com/LadybirdBrowser/ladybird/commit/57ef949b61e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6662
2 changed files with 59 additions and 46 deletions
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102
Libraries/LibRegex/RegexOptimizer.cpp
View File

@@ -430,9 +430,18 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
temporary_inverse = false;
reset_temporary_inverse = false;
inverse = false;
auto in_or = false; // We're in an OR block, so we should wait for the EndAndOr to decide if we would match.
auto matched_in_or = false;
auto inverse_matched_in_or = false;
struct DisjunctionState {
bool in_or = false; // We're in an OR block, so we should wait for the EndAndOr to decide if we would match.
bool matched_in_or = false;
bool inverse_matched_in_or = false;
};
Vector<DisjunctionState, 2> disjunction_stack;
disjunction_stack.empend();
auto in_or = [&] -> bool& { return disjunction_stack.last().in_or; };
auto matched_in_or = [&] -> bool& { return disjunction_stack.last().matched_in_or; };
auto inverse_matched_in_or = [&] -> bool& { return disjunction_stack.last().inverse_matched_in_or; };
for (auto const& pair : rhs) {
if (reset_temporary_inverse) {
@@ -452,7 +461,7 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
dbgln(" {}", character_class_name(char_class));
for (auto& char_class : lhs_negated_char_classes)
dbgln(" ^{}", character_class_name(char_class));
dbgln("}}, in or: {}, matched in or: {}, inverse matched in or: {}", in_or, matched_in_or, inverse_matched_in_or);
dbgln("}}, in or: {}, matched in or: {}, inverse matched in or: {}", in_or(), matched_in_or(), inverse_matched_in_or());
}
switch (pair.type) {
@@ -465,20 +474,20 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
break;
case CharacterCompareType::AnyChar:
// Special case: if not inverted, AnyChar is always in the range.
if (!in_or && !current_lhs_inversion_state())
if (!in_or() && !current_lhs_inversion_state())
return true;
if (in_or) {
matched_in_or = true;
inverse_matched_in_or = false;
if (in_or()) {
matched_in_or() = true;
inverse_matched_in_or() = false;
}
break;
case CharacterCompareType::Char: {
auto matched = range_contains(pair.value);
if (!in_or && (current_lhs_inversion_state() ^ matched))
if (!in_or() && (current_lhs_inversion_state() ^ matched))
return true;
if (in_or) {
matched_in_or |= matched;
inverse_matched_in_or |= !matched;
if (in_or()) {
matched_in_or() |= matched;
inverse_matched_in_or() |= !matched;
}
break;
}
@@ -488,23 +497,23 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
return true;
case CharacterCompareType::CharClass: {
auto contains = char_class_contains(static_cast<CharClass>(pair.value));
if (!in_or && (current_lhs_inversion_state() ^ contains))
if (!in_or() && (current_lhs_inversion_state() ^ contains))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= !contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= !contains;
}
break;
}
case CharacterCompareType::CharRange: {
auto range = CharRange(pair.value);
auto contains = range_contains(range);
if (!in_or && (contains ^ current_lhs_inversion_state()))
if (!in_or() && (contains ^ current_lhs_inversion_state()))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= !contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= !contains;
}
break;
@@ -525,16 +534,16 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
return true;
if (has_any_unicode_property && !lhs_unicode_properties.is_empty() && !lhs_negated_unicode_properties.is_empty()) {
auto contains = lhs_unicode_properties.contains(static_cast<Unicode::Property>(pair.value));
if (!in_or && (current_lhs_inversion_state() ^ contains))
if (!in_or() && (current_lhs_inversion_state() ^ contains))
return true;
auto inverse_contains = lhs_negated_unicode_properties.contains(static_cast<Unicode::Property>(pair.value));
if (!in_or && !(current_lhs_inversion_state() ^ inverse_contains))
if (!in_or() && !(current_lhs_inversion_state() ^ inverse_contains))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= inverse_contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= inverse_contains;
}
}
break;
@@ -543,14 +552,14 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
return true;
if (has_any_unicode_property && !lhs_unicode_general_categories.is_empty() && !lhs_negated_unicode_general_categories.is_empty()) {
auto contains = lhs_unicode_general_categories.contains(static_cast<Unicode::GeneralCategory>(pair.value));
if (!in_or && (current_lhs_inversion_state() ^ contains))
if (!in_or() && (current_lhs_inversion_state() ^ contains))
return true;
auto inverse_contains = lhs_negated_unicode_general_categories.contains(static_cast<Unicode::GeneralCategory>(pair.value));
if (!in_or && !(current_lhs_inversion_state() ^ inverse_contains))
if (!in_or() && !(current_lhs_inversion_state() ^ inverse_contains))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= inverse_contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= inverse_contains;
}
}
break;
@@ -559,14 +568,14 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
return true;
if (has_any_unicode_property && !lhs_unicode_scripts.is_empty() && !lhs_negated_unicode_scripts.is_empty()) {
auto contains = lhs_unicode_scripts.contains(static_cast<Unicode::Script>(pair.value));
if (!in_or && (current_lhs_inversion_state() ^ contains))
if (!in_or() && (current_lhs_inversion_state() ^ contains))
return true;
auto inverse_contains = lhs_negated_unicode_scripts.contains(static_cast<Unicode::Script>(pair.value));
if (!in_or && !(current_lhs_inversion_state() ^ inverse_contains))
if (!in_or() && !(current_lhs_inversion_state() ^ inverse_contains))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= inverse_contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= inverse_contains;
}
}
break;
@@ -575,33 +584,34 @@ static bool has_overlap(Vector<CompareTypeAndValuePair> const& lhs, Vector<Compa
return true;
if (has_any_unicode_property && !lhs_unicode_script_extensions.is_empty() && !lhs_negated_unicode_script_extensions.is_empty()) {
auto contains = lhs_unicode_script_extensions.contains(static_cast<Unicode::Script>(pair.value));
if (!in_or && (current_lhs_inversion_state() ^ contains))
if (!in_or() && (current_lhs_inversion_state() ^ contains))
return true;
auto inverse_contains = lhs_negated_unicode_script_extensions.contains(static_cast<Unicode::Script>(pair.value));
if (!in_or && !(current_lhs_inversion_state() ^ inverse_contains))
if (!in_or() && !(current_lhs_inversion_state() ^ inverse_contains))
return true;
if (in_or) {
matched_in_or |= contains;
inverse_matched_in_or |= inverse_contains;
if (in_or()) {
matched_in_or() |= contains;
inverse_matched_in_or() |= inverse_contains;
}
}
break;
case CharacterCompareType::Or:
in_or = true;
disjunction_stack.empend(true);
break;
case CharacterCompareType::EndAndOr:
case CharacterCompareType::EndAndOr: {
// FIXME: Handle And when we support it below.
VERIFY(in_or);
in_or = false;
VERIFY(in_or());
auto state = disjunction_stack.take_last();
if (current_lhs_inversion_state()) {
if (!inverse_matched_in_or)
if (!state.inverse_matched_in_or)
return true;
} else {
if (matched_in_or)
if (state.matched_in_or)
return true;
}
break;
}
case CharacterCompareType::And:
// FIXME: These are too difficult to handle, so bail out.
return true;

3
Tests/LibRegex/TestRegex.cpp
View File

@@ -738,6 +738,9 @@ TEST_CASE(ECMA262_match)
{ "((?<x>a)|(?<x>b))"sv, "aa"sv, false },
// Insensitive charclasses should accept upper/lowercase in pattern (lookup table should still be ordered if insensitive lookup is used), ladybird#5399.
{ "[aBc]"sv, "b"sv, true, ECMAScriptFlags::Insensitive },
// Optimizer bug: nested 'or' compare ops caused a crash, ladybird#6647.
{ "([[[]]])*0"sv, ""sv, false, ECMAScriptFlags::UnicodeSets },
{ "(([[[]]]{2,})\\s)*"sv, ""sv, true, (ECMAScriptFlags::UnicodeSets | ECMAScriptFlags::Global).value() },
};
for (auto& test : tests) {