vendor/ezyang/htmlpurifier/library/HTMLPurifier/ConfigSchema/Builder/Xml.php

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<?php

/**
 * Converts HTMLPurifier_ConfigSchema_Interchange to an XML format,
 * which can be further processed to generate documentation.
 */
class HTMLPurifier_ConfigSchema_Builder_Xml extends XMLWriter
{

    /**
     * @type HTMLPurifier_ConfigSchema_Interchange
     */
    protected $interchange;

    /**
     * @type string
     */
    private $namespace;

    /**
     * @param string $html
     */
    protected function writeHTMLDiv($html)
    {
        $this->startElement('div');

        $purifier = HTMLPurifier::getInstance();
        $html = $purifier->purify($html);
        $this->writeAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
        $this->writeRaw($html);

        $this->endElement(); // div
    }

    /**
     * @param mixed $var
     * @return string
     */
    protected function export($var)
    {
        if ($var === array()) {
            return 'array()';
        }
        return var_export($var, true);
    }

    /**
     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
     */
    public function build($interchange)
    {
        // global access, only use as last resort
        $this->interchange = $interchange;

        $this->setIndent(true);
        $this->startDocument('1.0', 'UTF-8');
        $this->startElement('configdoc');
        $this->writeElement('title', $interchange->name);

        foreach ($interchange->directives as $directive) {