vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIDefinition.php

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<?php

class HTMLPurifier_URIDefinition extends HTMLPurifier_Definition
{

    public $type = 'URI';
    protected $filters = array();
    protected $postFilters = array();
    protected $registeredFilters = array();

    /**
     * HTMLPurifier_URI object of the base specified at %URI.Base
     */
    public $base;

    /**
     * String host to consider "home" base, derived off of $base
     */
    public $host;

    /**
     * Name of default scheme based on %URI.DefaultScheme and %URI.Base
     */
    public $defaultScheme;

    public function __construct()
    {
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternal());
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternalResources());
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableResources());
        $this->registerFilter(new HTMLPurifier_URIFilter_HostBlacklist());
        $this->registerFilter(new HTMLPurifier_URIFilter_SafeIframe());
        $this->registerFilter(new HTMLPurifier_URIFilter_MakeAbsolute());
        $this->registerFilter(new HTMLPurifier_URIFilter_Munge());
    }

    public function registerFilter($filter)
    {
        $this->registeredFilters[$filter->name] = $filter;
    }

    public function addFilter($filter, $config)
    {
        $r = $filter->prepare($config);
        if ($r === false) return; // null is ok, for backwards compat
        if ($filter->post) {
            $this->postFilters[$filter->name] = $filter;
        } else {
            $this->filters[$filter->name] = $filter;
        }
    }

    protected function doSetup($config)
    {
        $this->setupMemberVariables($config);
        $this->setupFilters($config);
    }

    protected function setupFilters($config)
    {