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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 $anotherRangeSet): RangeSet |
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{ |
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$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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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, $anotherRange)) { |
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break; |
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} |
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if (!$range->intersects($anotherRange)) { |
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if ($range->getStart() < $anotherRange->getStart()) { |
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$index++; |
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} else { |
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$anotherIndex++; |
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} |
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continue; |
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} |
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if ($range->startsBeforeStartOf($anotherRange)) { |
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$range = $range->copyAfterStartOf($anotherRange); |
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} elseif ($anotherRange->startsBeforeStartOf($range)) { |
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$anotherRange = $anotherRange->copyAfterStartOf($range); |
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} |
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if ($range->endsBeforeFinishOf($anotherRange)) { |
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$newRangeList[] = $range; |
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$index++; |
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continue; |
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} |
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if ($anotherRange->endsBeforeFinishOf($range)) { |
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$newRangeList[] = $anotherRange; |
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$anotherIndex++; |
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continue; |
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} |
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$newRangeList[] = $range; |
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$index++; |
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$anotherIndex++; |
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} |
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return RangeSet::loadUnsafe(...$newRangeList); |
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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
