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<?php |
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declare( strict_types = 1 ); |
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namespace Diff\Differ; |
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use Diff\Comparer\StrictComparer; |
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use Diff\Comparer\ValueComparer; |
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use Diff\DiffOp\Diff\Diff; |
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use Diff\DiffOp\DiffOp; |
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use Diff\DiffOp\DiffOpAdd; |
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use Diff\DiffOp\DiffOpChange; |
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use Diff\DiffOp\DiffOpRemove; |
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use Exception; |
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use LogicException; |
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/** |
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* Differ that does an associative diff between two arrays, |
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* with the option to do this recursively. |
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* |
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* @since 0.4 |
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* |
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* @license GPL-2.0+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class MapDiffer implements Differ { |
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/** |
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* @var bool |
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*/ |
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private $recursively; |
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/** |
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* @var Differ |
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*/ |
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private $listDiffer; |
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/** |
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* @var ValueComparer |
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*/ |
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private $valueComparer; |
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/** |
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* The third argument ($comparer) was added in 3.0 |
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*/ |
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public function __construct( bool $recursively = false, Differ $listDiffer = null, ValueComparer $comparer = null ) { |
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$this->recursively = $recursively; |
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$this->listDiffer = $listDiffer ?? new ListDiffer(); |
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$this->valueComparer = $comparer ?? new StrictComparer(); |
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} |
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/** |
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* @see Differ::doDiff |
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* |
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* Computes the diff between two associate arrays. |
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* |
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* @since 0.4 |
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* |
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* @param array $oldValues The first array |
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* @param array $newValues The second array |
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* |
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* @throws Exception |
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* @return DiffOp[] |
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*/ |
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public function doDiff( array $oldValues, array $newValues ): array { |
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$newSet = $this->arrayDiffAssoc( $newValues, $oldValues ); |
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$oldSet = $this->arrayDiffAssoc( $oldValues, $newValues ); |
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$diffSet = array(); |
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foreach ( $this->getAllKeys( $oldSet, $newSet ) as $key ) { |
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$diffOp = $this->getDiffOpForElement( $key, $oldSet, $newSet ); |
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if ( $diffOp !== null ) { |
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$diffSet[$key] = $diffOp; |
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} |
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} |
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return $diffSet; |
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} |
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private function getAllKeys( $oldSet, $newSet ): array { |
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return array_unique( array_merge( |
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array_keys( $oldSet ), |
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array_keys( $newSet ) |
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) ); |
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} |
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private function getDiffOpForElement( $key, array $oldSet, array $newSet ) { |
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$hasOld = array_key_exists( $key, $oldSet ); |
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$hasNew = array_key_exists( $key, $newSet ); |
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if ( $this->recursively ) { |
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$diffOp = $this->getDiffOpForElementRecursively( $key, $oldSet, $newSet ); |
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if ( $diffOp !== null ) { |
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if ( $diffOp->isEmpty() ) { |
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// there is no (relevant) difference |
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return null; |
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} else { |
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return $diffOp; |
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} |
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} |
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} |
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if ( $hasOld && $hasNew ) { |
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return new DiffOpChange( $oldSet[$key], $newSet[$key] ); |
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} |
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elseif ( $hasOld ) { |
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return new DiffOpRemove( $oldSet[$key] ); |
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} |
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elseif ( $hasNew ) { |
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return new DiffOpAdd( $newSet[$key] ); |
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} |
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// @codeCoverageIgnoreStart |
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throw new LogicException( 'The element needs to exist in either the old or new list to compare' ); |
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// @codeCoverageIgnoreEnd |
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} |
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private function getDiffOpForElementRecursively( $key, array $oldSet, array $newSet ) { |
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$old = array_key_exists( $key, $oldSet ) ? $oldSet[$key] : array(); |
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$new = array_key_exists( $key, $newSet ) ? $newSet[$key] : array(); |
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if ( is_array( $old ) && is_array( $new ) ) { |
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return $this->getDiffForArrays( $old, $new ); |
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} |
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return null; |
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} |
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private function getDiffForArrays( array $old, array $new ): Diff { |
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if ( $this->isAssociative( $old ) || $this->isAssociative( $new ) ) { |
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return new Diff( $this->doDiff( $old, $new ), true ); |
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} |
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return new Diff( $this->listDiffer->doDiff( $old, $new ), false ); |
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} |
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/** |
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* Returns if an array is associative or not. |
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* |
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* @param array $array |
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* |
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* @return bool |
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*/ |
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private function isAssociative( array $array ): bool { |
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foreach ( $array as $key => $value ) { |
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if ( is_string( $key ) ) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Similar to the native array_diff_assoc function, except that it will |
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* spot differences between array values. Very weird the native |
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* function just ignores these... |
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* |
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* @see http://php.net/manual/en/function.array-diff-assoc.php |
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* |
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* @param array $from |
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* @param array $to |
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* |
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* @return array |
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*/ |
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private function arrayDiffAssoc( array $from, array $to ): array { |
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$diff = array(); |
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foreach ( $from as $key => $value ) { |
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if ( !array_key_exists( $key, $to ) || !$this->valueComparer->valuesAreEqual( $to[$key], $value ) ) { |
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$diff[$key] = $value; |
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} |
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} |
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return $diff; |
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} |
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} |
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wmde /
Diff
