# woocommerce-pos/1.10.21/vendor_prefixed/chillerlan/php-qrcode/src/Output/QRMarkup.php

WCPOS – Point of Sale (POS) plugin for WooCommerce, version 1.10.21. 85 lines.

- Page: https://pluginprobe.com/plugins/woocommerce-pos/1.10.21/code/vendor_prefixed/chillerlan/php-qrcode/src/Output/QRMarkup.php
- Raw: https://pluginprobe.com/plugins/woocommerce-pos/1.10.21/raw/vendor_prefixed/chillerlan/php-qrcode/src/Output/QRMarkup.php
- Modified: 2026-06-09T13:55:26+00:00

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```php
<?php

/**
 * Class QRMarkup
 *
 * @created      17.12.2016
 * @author       Smiley <smiley@chillerlan.net>
 * @copyright    2016 Smiley
 * @license      MIT
 */
namespace WCPOS\Vendor\chillerlan\QRCode\Output;

use function is_string, preg_match, strip_tags, trim;
/**
 * Abstract for markup types: HTML, SVG, ... XML anyone?
 */
abstract class QRMarkup extends QROutputAbstract
{
    /**
     * note: we're not necessarily validating the several values, just checking the general syntax
     * note: css4 colors are not included
     *
     * @todo: XSS proof
     *
     * @see https://developer.mozilla.org/en-US/docs/Web/CSS/color_value
     * @inheritDoc
     */
    public static function moduleValueIsValid($value) : bool
    {
        if (!is_string($value)) {
            return \false;
        }
        $value = trim(strip_tags($value), " '\"\r\n\t");
        // hex notation
        // #rgb(a)
        // #rrggbb(aa)
        if (preg_match('/^#([\\da-f]{3}){1,2}$|^#([\\da-f]{4}){1,2}$/i', $value)) {
            return \true;
        }
        // css: hsla/rgba(...values)
        if (preg_match('#^(hsla?|rgba?)\\([\\d .,%/]+\\)$#i', $value)) {
            return \true;
        }
        // predefined css color
        if (preg_match('/^[a-z]+$/i', $value)) {
            return \true;
        }
        return \false;
    }
    /**
     * @inheritDoc
     */
    protected function prepareModuleValue($value) : string
    {
        return trim(strip_tags($value), " '\"\r\n\t");
    }
    /**
     * @inheritDoc
     */
    protected function getDefaultModuleValue(bool $isDark) : string
    {
        return $isDark ? '#000' : '#fff';
    }
    /**
     * @inheritDoc
     */
    public function dump(?string $file = null) : string
    {
        $data = $this->createMarkup($file !== null);
        $this->saveToFile($data, $file);
        return $data;
    }
    /**
     * returns a string with all css classes for the current element
     */
    protected function getCssClass(int $M_TYPE = 0) : string
    {
        return $this->options->cssClass;
    }
    /**
     * returns the fully parsed and rendered markup string for the given input
     */
    protected abstract function createMarkup(bool $saveToFile) : string;
}

```