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<?php
/*
 * This file is part of sebastian/comparator.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Comparator;

use
DOMDocument;
use
DOMNode;

/**
 * Compares DOMNode instances for equality.
 */
class DOMNodeComparator extends ObjectComparator
{
   
/**
     * Returns whether the comparator can compare two values.
     *
     * @param mixed $expected The first value to compare
     * @param mixed $actual   The second value to compare
     *
     * @return bool
     */
   
public function accepts($expected, $actual)
    {
        return
$expected instanceof DOMNode && $actual instanceof DOMNode;
    }

   
/**
     * Asserts that two values are equal.
     *
     * @param mixed $expected     First value to compare
     * @param mixed $actual       Second value to compare
     * @param float $delta        Allowed numerical distance between two values to consider them equal
     * @param bool  $canonicalize Arrays are sorted before comparison when set to true
     * @param bool  $ignoreCase   Case is ignored when set to true
     * @param array $processed    List of already processed elements (used to prevent infinite recursion)
     *
     * @throws ComparisonFailure
     */
   
public function assertEquals($expected, $actual, $delta = 0.0, $canonicalize = false, $ignoreCase = false, array &$processed = [])
    {
       
$expectedAsString = $this->nodeToText($expected, true, $ignoreCase);
       
$actualAsString   = $this->nodeToText($actual, true, $ignoreCase);

        if (
$expectedAsString !== $actualAsString) {
           
$type = $expected instanceof DOMDocument ? 'documents' : 'nodes';

            throw new
ComparisonFailure(
               
$expected,
               
$actual,
               
$expectedAsString,
               
$actualAsString,
               
false,
                \
sprintf("Failed asserting that two DOM %s are equal.\n", $type)
            );
        }
    }

   
/**
     * Returns the normalized, whitespace-cleaned, and indented textual
     * representation of a DOMNode.
     */
   
private function nodeToText(DOMNode $node, bool $canonicalize, bool $ignoreCase): string
   
{
        if (
$canonicalize) {
           
$document = new DOMDocument;
            @
$document->loadXML($node->C14N());

           
$node = $document;
        }

       
$document = $node instanceof DOMDocument ? $node : $node->ownerDocument;

       
$document->formatOutput = true;
       
$document->normalizeDocument();

       
$text = $node instanceof DOMDocument ? $node->saveXML() : $document->saveXML($node);

        return
$ignoreCase ? $text : \strtolower($text);
    }
}