vendor/phpunit/phpunit/src/Framework/Constraint/StringMatches.php

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<?php
/*
 * This file is part of PHPUnit.
 *
 * (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.
 */

use SebastianBergmann\Diff\Differ;

/**
 * ...
 *
 * @since Class available since Release 3.5.0
 */
class PHPUnit_Framework_Constraint_StringMatches extends PHPUnit_Framework_Constraint_PCREMatch
{
    /**
     * @var string
     */
    protected $string;

    /**
     * @param string $string
     */
    public function __construct($string)
    {
        parent::__construct($string);

        $this->pattern = $this->createPatternFromFormat(
            preg_replace('/\r\n/', "\n", $string)
        );

        $this->string = $string;
    }

    protected function failureDescription($other)
    {
        return 'format description matches text';
    }

    protected function additionalFailureDescription($other)
    {
        $from = preg_split('(\r\n|\r|\n)', $this->string);
        $to   = preg_split('(\r\n|\r|\n)', $other);

        foreach ($from as $index => $line) {
            if (isset($to[$index]) && $line !== $to[$index]) {
                $line = $this->createPatternFromFormat($line);

                if (preg_match($line, $to[$index]) > 0) {
                    $from[$index] = $to[$index];
                }
            }
        }

        $this->string = implode("\n", $from);
        $other        = implode("\n", $to);