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LibRegex: Flush compare tables before entering a permanent inverse state

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This commit is contained in:
Ali Mohammad Pur 2022-07-10 11:42:31 +04:30 • committed by Andreas Kling
parent fbeef409c6
commit 9c5febe800
2 changed files with 46 additions and 38 deletions
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82
Userland/Libraries/LibRegex/RegexOptimizer.cpp
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@ -840,6 +840,47 @@ void Optimizer::append_character_class(ByteCode& target, Vector<CompareTypeAndVa
bool invert_for_next_iteration = false;
bool is_currently_inverted = false;
auto flush_tables = [&] {
auto append_table = [&](auto& table) {
++argument_count;
arguments.append(to_underlying(CharacterCompareType::LookupTable));
auto size_index = arguments.size();
arguments.append(0);
Optional<CharRange> active_range;
size_t range_count = 0;
for (auto& range : table) {
if (!active_range.has_value()) {
active_range = range;
continue;
}
if (range.from <= active_range->to + 1 && range.to + 1 >= active_range->from) {
active_range = CharRange { min(range.from, active_range->from), max(range.to, active_range->to) };
} else {
++range_count;
arguments.append(active_range.release_value());
active_range = range;
}
}
if (active_range.has_value()) {
++range_count;
arguments.append(active_range.release_value());
}
arguments[size_index] = range_count;
};
auto contains_regular_table = !table.is_empty();
auto contains_inverted_table = !inverted_table.is_empty();
if (contains_regular_table)
append_table(table);
if (contains_inverted_table) {
++argument_count;
arguments.append(to_underlying(CharacterCompareType::TemporaryInverse));
append_table(inverted_table);
}
};
for (auto& value : pairs) {
auto should_invert_after_this_iteration = invert_for_next_iteration;
invert_for_next_iteration = false;
@ -861,8 +902,9 @@ void Optimizer::append_character_class(ByteCode& target, Vector<CompareTypeAndVa
is_currently_inverted = !is_currently_inverted;
break;
case LookupTableInsertionOutcome::PermanentInversionNeeded:
swap(current_table, current_inverted_table);
is_currently_inverted = !is_currently_inverted;
flush_tables();
arguments.append(to_underlying(CharacterCompareType::Inverse));
++argument_count;
break;
case LookupTableInsertionOutcome::CannotPlaceInTable:
if (is_currently_inverted) {
@ -880,42 +922,8 @@ void Optimizer::append_character_class(ByteCode& target, Vector<CompareTypeAndVa
is_currently_inverted = !is_currently_inverted;
}
}
auto append_table = [&](auto& table) {
++argument_count;
arguments.append(to_underlying(CharacterCompareType::LookupTable));
auto size_index = arguments.size();
arguments.append(0);
Optional<CharRange> active_range;
size_t range_count = 0;
for (auto& range : table) {
if (!active_range.has_value()) {
active_range = range;
continue;
}
if (range.from <= active_range->to + 1 && range.to + 1 >= active_range->from) {
active_range = CharRange { min(range.from, active_range->from), max(range.to, active_range->to) };
} else {
++range_count;
arguments.append(active_range.release_value());
active_range = range;
}
}
if (active_range.has_value()) {
++range_count;
arguments.append(active_range.release_value());
}
arguments[size_index] = range_count;
};
if (!table.is_empty())
append_table(table);
if (!inverted_table.is_empty()) {
++argument_count;
arguments.append(to_underlying(CharacterCompareType::TemporaryInverse));
append_table(inverted_table);
}
flush_tables();
}
target.empend(static_cast<ByteCodeValueType>(OpCodeId::Compare));