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

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<?php

/**
 * Abstract class for a set of proprietary modules that clean up (tidy)
 * poorly written HTML.
 * @todo Figure out how to protect some of these methods/properties
 */
class HTMLPurifier_HTMLModule_Tidy extends HTMLPurifier_HTMLModule
{
    /**
     * List of supported levels.
     * Index zero is a special case "no fixes" level.
     * @type array
     */
    public $levels = array(0 => 'none', 'light', 'medium', 'heavy');

    /**
     * Default level to place all fixes in.
     * Disabled by default.
     * @type string
     */
    public $defaultLevel = null;

    /**
     * Lists of fixes used by getFixesForLevel().
     * Format is:
     *      HTMLModule_Tidy->fixesForLevel[$level] = array('fix-1', 'fix-2');
     * @type array
     */
    public $fixesForLevel = array(
        'light' => array(),
        'medium' => array(),
        'heavy' => array()
    );

    /**
     * Lazy load constructs the module by determining the necessary
     * fixes to create and then delegating to the populate() function.
     * @param HTMLPurifier_Config $config
     * @todo Wildcard matching and error reporting when an added or
     *       subtracted fix has no effect.
     */
    public function setup($config)
    {
        // create fixes, initialize fixesForLevel
        $fixes = $this->makeFixes();
        $this->makeFixesForLevel($fixes);

        // figure out which fixes to use
        $level = $config->get('HTML.TidyLevel');
        $fixes_lookup = $this->getFixesForLevel($level);

        // get custom fix declarations: these need namespace processing
        $add_fixes = $config->get('HTML.TidyAdd');
        $remove_fixes = $config->get('HTML.TidyRemove');

        foreach ($fixes as $name => $fix) {
            // needs to be refactored a little to implement globbing
            if (isset($remove_fixes[$name]) ||
                (!isset($add_fixes[$name]) && !isset($fixes_lookup[$name]))) {