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<?php |
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namespace Remorhaz\UniLex\RegExp\FSM; |
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use Remorhaz\UniLex\Exception; |
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class RangeSetCalc |
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{ |
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public function equals(RangeSet $rangeSet, RangeSet $anotherRangeSet): bool |
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{ |
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$rangeList = $rangeSet->getRanges(); |
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$anotherRangeList = $anotherRangeSet->getRanges(); |
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if (count($rangeList) != count($anotherRangeList)) { |
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return false; |
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} |
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foreach ($rangeList as $index => $range) { |
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$anotherRange = $anotherRangeList[$index]; |
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if ($range->getStart() != $anotherRange->getStart()) { |
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return false; |
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} |
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if ($range->getFinish() != $anotherRange->getFinish()) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* @param RangeSet $rangeSet |
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* @param RangeSet $anotherRangeSet |
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* @return RangeSet |
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* @throws Exception |
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*/ |
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public function and(RangeSet $rangeSet, RangeSet $anotherRangeSet): RangeSet |
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{ |
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$result = new RangeSet(); |
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foreach ($anotherRangeSet->getRanges() as $range) { |
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$andRangeSetPart = $this->andSingleRange($rangeSet, $range); |
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$result->addRange(...$andRangeSetPart->getRanges()); |
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} |
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return $result; |
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} |
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/** |
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* @param RangeSet $rangeSetPart |
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* @param Range $range |
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* @return RangeSet |
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* @throws Exception |
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*/ |
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private function andSingleRange(RangeSet $rangeSetPart, Range $range): RangeSet |
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{ |
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$rangeSet = new RangeSet(); |
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if ($rangeSetPart->isEmpty()) { |
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return $rangeSet; |
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} |
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foreach ($rangeSetPart->getRanges() as $existingRange) { |
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if (!$existingRange->intersects($range)) { |
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continue; |
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} |
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if ($range->startsBeforeStartOf($existingRange)) { |
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$range = $range->copyAfterStartOf($existingRange); |
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} |
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if ($existingRange->endsBeforeFinishOf($range)) { |
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$rangeSet->addRange($range->copyBeforeFinishOf($existingRange)); |
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$range = $range->copyAfterFinishOf($existingRange); |
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continue; |
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} |
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$rangeSet->addRange($range); |
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} |
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return $rangeSet; |
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} |
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/** |
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* @param RangeSet $rangeSet |
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* @param RangeSet $anotherRangeSet |
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* @return RangeSet |
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* @throws Exception |
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*/ |
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public function xor(RangeSet $rangeSet, RangeSet $anotherRangeSet): RangeSet |
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{ |
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$ranges = $rangeSet->getRanges(); |
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$otherRanges = $anotherRangeSet->getRanges(); |
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$index = 0; |
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$anotherIndex = 0; |
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$newRangeList = []; |
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/** @var Range $rangeBuffer */ |
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$rangeBuffer = null; |
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while (true) { |
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$range = $ranges[$index] ?? null; |
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$anotherRange = $otherRanges[$anotherIndex] ?? null; |
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if (isset($range)) { |
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if (isset($anotherRange) && $range->getStart() > $anotherRange->getStart()) { |
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$pickedRange = $anotherRange; |
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$anotherIndex++; |
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} else { |
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$pickedRange = $range; |
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$index++; |
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} |
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} elseif (isset($anotherRange)) { |
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$pickedRange = $anotherRange; |
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$anotherIndex++; |
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} else { |
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if (isset($rangeBuffer)) { |
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$newRangeList[] = $rangeBuffer; |
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} |
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break; |
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} |
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if (isset($rangeBuffer)) { |
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if ($rangeBuffer->intersects($pickedRange)) { |
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if ($rangeBuffer->startsBeforeStartOf($pickedRange)) { |
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$newRangeList[] = $rangeBuffer->copyBeforeStartOf($pickedRange); |
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$rangeBuffer = $rangeBuffer->copyAfterStartOf($pickedRange); |
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} elseif ($pickedRange->startsBeforeStartOf($rangeBuffer)) { |
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$newRangeList[] = $pickedRange->copyBeforeStartOf($rangeBuffer); |
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$rangeBuffer = $pickedRange->copyAfterStartOf($rangeBuffer); |
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} |
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if ($rangeBuffer->endsBeforeFinishOf($pickedRange)) { |
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$rangeBuffer = $pickedRange->copyAfterFinishOf($rangeBuffer); |
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} elseif ($pickedRange->endsBeforeFinishOf($rangeBuffer)) { |
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$rangeBuffer = $rangeBuffer->copyAfterFinishOf($pickedRange); |
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} else { |
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$rangeBuffer = null; |
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} |
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continue; |
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} |
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if ($pickedRange->follows($rangeBuffer)) { |
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$rangeBuffer = $rangeBuffer->copyBeforeFinishOf($pickedRange); |
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continue; |
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} |
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$newRangeList[] = $rangeBuffer; |
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} |
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$rangeBuffer = $pickedRange; |
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} |
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return RangeSet::loadUnsafe(...$newRangeList); |
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} |
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} |
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remorhaz /
php-unilex
