vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Forms.php

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<?php

/**
 * XHTML 1.1 Forms module, defines all form-related elements found in HTML 4.
 */
class HTMLPurifier_HTMLModule_Forms extends HTMLPurifier_HTMLModule
{
    /**
     * @type string
     */
    public $name = 'Forms';

    /**
     * @type bool
     */
    public $safe = false;

    /**
     * @type array
     */
    public $content_sets = array(
        'Block' => 'Form',
        'Inline' => 'Formctrl',
    );

    /**
     * @param HTMLPurifier_Config $config
     */
    public function setup($config)
    {
        $form = $this->addElement(
            'form',
            'Form',
            'Required: Heading | List | Block | fieldset',
            'Common',
            array(
                'accept' => 'ContentTypes',
                'accept-charset' => 'Charsets',
                'action*' => 'URI',
                'method' => 'Enum#get,post',
                // really ContentType, but these two are the only ones used today
                'enctype' => 'Enum#application/x-www-form-urlencoded,multipart/form-data',
            )
        );
        $form->excludes = array('form' => true);

        $input = $this->addElement(
            'input',
            'Formctrl',
            'Empty',
            'Common',
            array(
                'accept' => 'ContentTypes',
                'accesskey' => 'Character',
                'alt' => 'Text',
                'checked' => 'Bool#checked',
                'disabled' => 'Bool#disabled',
                'maxlength' => 'Number',
                'name' => 'CDATA',
                'readonly' => 'Bool#readonly',