vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/RemoveEmpty.php

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<?php

class HTMLPurifier_Injector_RemoveEmpty extends HTMLPurifier_Injector
{
    /**
     * @type HTMLPurifier_Context
     */
    private $context;

    /**
     * @type HTMLPurifier_Config
     */
    private $config;

    /**
     * @type HTMLPurifier_AttrValidator
     */
    private $attrValidator;

    /**
     * @type bool
     */
    private $removeNbsp;

    /**
     * @type bool
     */
    private $removeNbspExceptions;

    /**
     * Cached contents of %AutoFormat.RemoveEmpty.Predicate
     * @type array
     */
    private $exclude;

    /**
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return void
     */
    public function prepare($config, $context)
    {
        parent::prepare($config, $context);
        $this->config = $config;
        $this->context = $context;
        $this->removeNbsp = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp');
        $this->removeNbspExceptions = $config->get('AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions');
        $this->exclude = $config->get('AutoFormat.RemoveEmpty.Predicate');
        foreach ($this->exclude as $key => $attrs) {
            if (!is_array($attrs)) {
                // HACK, see HTMLPurifier/Printer/ConfigForm.php
                $this->exclude[$key] = explode(';', $attrs);
            }
        }
        $this->attrValidator = new HTMLPurifier_AttrValidator();
    }

    /**
     * @param HTMLPurifier_Token $token
     */