vendor/ezyang/htmlpurifier/extras/ConfigDoc/HTMLXSLTProcessor.php

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<?php

/**
 * Decorator/extender XSLT processor specifically for HTML documents.
 */
class ConfigDoc_HTMLXSLTProcessor
{

    /**
     * Instance of XSLTProcessor
     */
    protected $xsltProcessor;

    public function __construct($proc = false)
    {
        if ($proc === false) $proc = new XSLTProcessor();
        $this->xsltProcessor = $proc;
    }

    /**
     * @note Allows a string $xsl filename to be passed
     */
    public function importStylesheet($xsl)
    {
        if (is_string($xsl)) {
            $xsl_file = $xsl;
            $xsl = new DOMDocument();
            $xsl->load($xsl_file);
        }
        return $this->xsltProcessor->importStylesheet($xsl);
    }

    /**
     * Transforms an XML file into compatible XHTML based on the stylesheet
     * @param $xml XML DOM tree, or string filename
     * @return string HTML output
     * @todo Rename to transformToXHTML, as transformToHTML is misleading
     */
    public function transformToHTML($xml)
    {
        if (is_string($xml)) {
            $dom = new DOMDocument();
            $dom->load($xml);
        } else {
            $dom = $xml;
        }
        $out = $this->xsltProcessor->transformToXML($dom);

        // fudges for HTML backwards compatibility
        // assumes that document is XHTML
        $out = str_replace('/>', ' />', $out); // <br /> not <br/>
        $out = str_replace(' xmlns=""', '', $out); // rm unnecessary xmlns

        if (class_exists('Tidy')) {
            // cleanup output
            $config = array(
                'indent'        => true,
                'output-xhtml'  => true,
                'wrap'          => 80
            );