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<?php

declare(strict_types=1);

/*
 * FINE granularity DIFF
 *
 * (c) 2011 Raymond Hill (http://raymondhill.net/blog/?p=441)
 * (c) 2013 Robert Crowe (http://cogpowered.com)
 * (c) 2021 Christian Kuhn
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace cogpowered\FineDiff\Render;

class Html extends Renderer
{
    public function callback(string $opcode, string $from, int $from_offset, int $from_len): string
    {
        if ($opcode === 'c') {
            $html = htmlentities(mb_substr($from, $from_offset, $from_len));
        } elseif ($opcode === 'd') {
            $deletion = mb_substr($from, $from_offset, $from_len);

            if (strcspn($deletion, " \n\r") === 0) {
                $deletion = str_replace(["\n", "\r"], ['\n', '\r'], $deletion);
            }

            $html = '<del>' . htmlentities($deletion) . '</del>';
        } else /* if ( $opcode === 'i' ) */ {
            $html = '<ins>' . htmlentities(mb_substr($from, $from_offset, $from_len)) . '</ins>';
        }

        return $html;
    }
}