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

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<?php

/**
 * Validates the attributes of a token. Doesn't manage required attributes
 * very well. The only reason we factored this out was because RemoveForeignElements
 * also needed it besides ValidateAttributes.
 */
class HTMLPurifier_AttrValidator
{

    /**
     * Validates the attributes of a token, mutating it as necessary.
     * that has valid tokens
     * @param HTMLPurifier_Token $token Token to validate.
     * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
     * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
     */
    public function validateToken($token, $config, $context)
    {
        $definition = $config->getHTMLDefinition();
        $e =& $context->get('ErrorCollector', true);

        // initialize IDAccumulator if necessary
        $ok =& $context->get('IDAccumulator', true);
        if (!$ok) {
            $id_accumulator = HTMLPurifier_IDAccumulator::build($config, $context);
            $context->register('IDAccumulator', $id_accumulator);
        }

        // initialize CurrentToken if necessary
        $current_token =& $context->get('CurrentToken', true);
        if (!$current_token) {
            $context->register('CurrentToken', $token);
        }

        if (!$token instanceof HTMLPurifier_Token_Start &&
            !$token instanceof HTMLPurifier_Token_Empty
        ) {
            return;
        }

        // create alias to global definition array, see also $defs
        // DEFINITION CALL
        $d_defs = $definition->info_global_attr;

        // don't update token until the very end, to ensure an atomic update
        $attr = $token->attr;

        // do global transformations (pre)
        // nothing currently utilizes this
        foreach ($definition->info_attr_transform_pre as $transform) {
            $attr = $transform->transform($o = $attr, $config, $context);
            if ($e) {
                if ($attr != $o) {
                    $e->send(E_NOTICE, 'AttrValidator: Attributes transformed', $o, $attr);
                }
            }
        }

        // do local transformations only applicable to this element (pre)