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<?php |
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/** |
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* (c) Steve Nebes <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace SN\DaisyDiff\Html; |
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use SN\DaisyDiff\Html\Modification\ModificationType; |
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use SN\DaisyDiff\Output\DiffOutputInterface; |
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use SN\DaisyDiff\RangeDifferencer\Core\LCSSettings; |
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use SN\DaisyDiff\RangeDifferencer\RangeDifference; |
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use SN\DaisyDiff\RangeDifferencer\RangeDifferencer; |
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/** |
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* Takes TextNodeComparator instances, computes the difference between them, marks the changes, and outputs a merged |
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* tree to a [] instance. |
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*/ |
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class HtmlDiffer |
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{ |
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/** @var DiffOutputInterface */ |
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private $output; |
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/** |
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* @param DiffOutputInterface $output |
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*/ |
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public function __construct(DiffOutputInterface $output) |
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{ |
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$this->output = $output; |
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} |
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/** |
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* Compares two Node Trees. |
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* |
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* @param TextNodeComparator $leftComparator Root of the first tree. |
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* @param TextNodeComparator $rightComparator Root of the second tree. |
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*/ |
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public function diff(TextNodeComparator $leftComparator, TextNodeComparator $rightComparator): void |
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{ |
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$settings = new LCSSettings(); |
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$settings->setUseGreedyMethod(false); |
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/** @var RangeDifference[] $differences */ |
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$differences = RangeDifferencer::findDifferences($leftComparator, $rightComparator, $settings); |
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$pDifferences = $this->preProcess($differences); |
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$currentIndexLeft = 0; |
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$currentIndexRight = 0; |
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/** @var RangeDifference $d */ |
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foreach ($pDifferences as $d) { |
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if ($d->getLeftStart() > $currentIndexLeft) { |
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$rightComparator->handlePossibleChangedPart( |
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$currentIndexLeft, $d->getLeftStart(), |
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$currentIndexRight, $d->getRightStart(), |
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$leftComparator); |
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} |
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if ($d->getLeftLength() > 0) { |
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$rightComparator->markAsDeleted( |
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$d->getLeftStart(), $d->getLeftEnd(), |
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$leftComparator, |
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$d->getRightStart()); |
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} |
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$rightComparator->markAsNew($d->getRightStart(), $d->getRightEnd()); |
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$currentIndexLeft = $d->getLeftEnd(); |
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$currentIndexRight = $d->getRightEnd(); |
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} |
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if ($currentIndexLeft < $leftComparator->getRangeCount()) { |
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$rightComparator->handlePossibleChangedPart( |
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$currentIndexLeft, $leftComparator->getRangeCount(), |
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$currentIndexRight, $rightComparator->getRangeCount(), |
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$leftComparator); |
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} |
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$rightComparator->expandWhiteSpace(); |
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$this->output->generateOutput($rightComparator->getBodyNode()); |
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} |
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/** |
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* @param TextNodeComparator $ancestorComparator |
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* @param TextNodeComparator $leftComparator |
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* @param TextNodeComparator $rightComparator |
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*/ |
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public function diff3( |
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TextNodeComparator $ancestorComparator, |
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TextNodeComparator $leftComparator, |
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TextNodeComparator $rightComparator |
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): void { |
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$settings = new LCSSettings(); |
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$settings->setUseGreedyMethod(false); |
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/** @var RangeDifference[] $differences */ |
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$differences = RangeDifferencer::findDifferences3($ancestorComparator, $leftComparator, $rightComparator); |
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$pDifferences = $this->preProcess($differences); |
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$currentIndexAncestor = 0; |
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$currentIndexLeft = 0; |
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$currentIndexRight = 0; |
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/** @var RangeDifference $d */ |
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foreach ($pDifferences as $d) { |
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$tempKind = $d->getKind(); |
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if (RangeDifference::ANCESTOR === $tempKind) { |
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// Ignore, we won't show pseudo-conflicts currently (left and right have the same change). |
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continue; |
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} |
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if ($d->getLeftStart() > $currentIndexLeft) { |
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$ancestorComparator->handlePossibleChangedPart( |
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$currentIndexLeft, $d->getLeftStart(), |
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$currentIndexAncestor, $d->getAncestorStart(), |
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$leftComparator); |
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} |
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if ($d->getRightStart() > $currentIndexRight) { |
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$ancestorComparator->handlePossibleChangedPart( |
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$currentIndexRight, $d->getRightStart(), |
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$currentIndexAncestor, $d->getAncestorStart(), |
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$rightComparator); |
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} |
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if (RangeDifference::CONFLICT === $tempKind || RangeDifference::LEFT === $tempKind) { |
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// Conflicts and changes on the left side. |
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if ($d->getLeftLength() > 0) { |
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$ancestorComparator->markAsDeleted( |
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$d->getLeftStart(), $d->getLeftEnd(), $leftComparator, |
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$d->getAncestorStart(), ModificationType::ADDED); |
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} |
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} |
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if (RangeDifference::CONFLICT === $tempKind || RangeDifference::RIGHT === $tempKind) { |
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// Conflicts and changes on the right side. |
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if ($d->getRightLength() > 0) { |
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$ancestorComparator->markAsDeleted( |
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$d->getRightStart(), $d->getRightEnd(), $rightComparator, |
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$d->getAncestorStart(), ModificationType::ADDED); |
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} |
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} |
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$ancestorComparator->markAsNew($d->getAncestorStart(), $d->getAncestorEnd(), ModificationType::REMOVED); |
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$currentIndexAncestor = $d->getAncestorEnd(); |
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$currentIndexLeft = $d->getLeftEnd(); |
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$currentIndexRight = $d->getRightEnd(); |
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} |
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if ($currentIndexLeft < $leftComparator->getRangeCount()) { |
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$ancestorComparator->handlePossibleChangedPart( |
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$currentIndexLeft, $leftComparator->getRangeCount(), |
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$currentIndexAncestor, $ancestorComparator->getRangeCount(), |
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$leftComparator); |
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} |
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if ($currentIndexRight < $rightComparator->getRangeCount()) { |
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$ancestorComparator->handlePossibleChangedPart( |
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$currentIndexRight, $rightComparator->getRangeCount(), |
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$currentIndexAncestor, $ancestorComparator->getRangeCount(), |
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$rightComparator); |
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} |
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$ancestorComparator->expandWhiteSpace(); |
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$this->output->generateOutput($ancestorComparator->getBodyNode()); |
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} |
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/** |
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* @param RangeDifference[] $differences |
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* @return RangeDifference[] |
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*/ |
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private function preProcess(array $differences): array |
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{ |
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/** @var RangeDifference[] */ |
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$newRanges = []; |
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for ($i = 0, $iMax = \count($differences); $i < $iMax; $i++) { |
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$ancestorStart = $differences[$i]->getAncestorStart(); |
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$ancestorEnd = $differences[$i]->getAncestorEnd(); |
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$leftStart = $differences[$i]->getLeftStart(); |
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$leftEnd = $differences[$i]->getLeftEnd(); |
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$rightStart = $differences[$i]->getRightStart(); |
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$rightEnd = $differences[$i]->getRightEnd(); |
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$kind = $differences[$i]->getKind(); |
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$ancestorLength = $ancestorEnd - $ancestorStart; |
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$leftLength = $leftEnd - $leftStart; |
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$rightLength = $rightEnd - $rightStart; |
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while ( |
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$i + 1 < $iMax && |
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$differences[$i + 1]->getKind() === $kind && |
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$this->score($leftLength, $differences[$i + 1]->getLeftLength(), $rightLength, |
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$differences[$i + 1]->getRightLength()) > ($differences[$i + 1]->getLeftStart() - $leftEnd) |
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) { |
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$ancestorEnd = $differences[$i + 1]->getAncestorEnd(); |
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$leftEnd = $differences[$i + 1]->getLeftEnd(); |
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$rightEnd = $differences[$i + 1]->getRightEnd(); |
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$ancestorLength = $ancestorEnd - $ancestorStart; |
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$leftLength = $leftEnd - $leftStart; |
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$rightLength = $rightEnd - $rightStart; |
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$i++; |
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} |
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$newRanges[] = new RangeDifference( |
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$kind, |
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$rightStart, $rightLength, |
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$leftStart, $leftLength, |
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$ancestorStart, $ancestorLength); |
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} |
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return $newRanges; |
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} |
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/** |
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* @param int[] $numbers |
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* @return float |
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* |
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* @throws \OutOfRangeException |
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*/ |
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public static function score(int ...$numbers): float |
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{ |
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if (\count($numbers) < 3) { |
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throw new \OutOfRangeException(); |
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} |
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if (($numbers[0] === 0 && $numbers[1] === 0) || ($numbers[2] === 0 && $numbers[3] === 0)) { |
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return (float) 0; |
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} |
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$d = 0; |
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foreach ($numbers as $number) { |
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while ($number > 3) { |
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$d += 3; |
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$number -= 3; |
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$number *= 0.5; |
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} |
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$d += $number; |
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} |
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return (float) ($d / (1.5 * \count($numbers))); |
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} |
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} |
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snebes /
php-daisydiff
