class ThemeCommonElements

class ThemeCommonElements {
    
    /**
     * Base theme array.
     *
     * @return array
     *   System theme array.
     */
    public static function commonElements() : array {
        return [
            'html' => [
                'render element' => 'html',
            ],
            'page' => [
                'render element' => 'page',
            ],
            'page_title' => [
                'variables' => [
                    'title' => NULL,
                ],
            ],
            'region' => [
                'render element' => 'elements',
            ],
            'time' => [
                'variables' => [
                    'timestamp' => NULL,
                    'text' => NULL,
                    'attributes' => [],
                ],
            ],
            'datetime_form' => [
                'render element' => 'element',
            ],
            'datetime_wrapper' => [
                'render element' => 'element',
            ],
            'status_messages' => [
                'variables' => [
                    'status_headings' => [],
                    'message_list' => NULL,
                ],
            ],
            'links' => [
                'variables' => [
                    'links' => [],
                    'attributes' => [
                        'class' => [
                            'links',
                        ],
                    ],
                    'heading' => [],
                    'set_active_class' => FALSE,
                ],
            ],
            'dropbutton_wrapper' => [
                'variables' => [
                    'children' => NULL,
                ],
            ],
            'image' => [
                // HTML 4 and XHTML 1.0 always require an alt attribute. The HTML 5 draft
                // allows the alt attribute to be omitted in some cases. Therefore,
                // default the alt attribute to an empty string, but allow code providing
                // variables to image.html.twig templates to pass explicit NULL for it to
                // be omitted. Usually, neither omission nor an empty string satisfies
                // accessibility requirements, so it is strongly encouraged for code
                // building variables for image.html.twig templates to pass a meaningful
                // value for the alt variable.
                // - https://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
                // - https://www.w3.org/TR/xhtml1/dtds.html
                // - http://dev.w3.org/html5/spec/Overview.html#alt
                // The title attribute is optional in all cases, so it is omitted by
                // default.
'variables' => [
                    'uri' => NULL,
                    'width' => NULL,
                    'height' => NULL,
                    'alt' => '',
                    'title' => NULL,
                    'attributes' => [],
                    'sizes' => NULL,
                    'srcset' => [],
                    'style_name' => NULL,
                ],
            ],
            'breadcrumb' => [
                'variables' => [
                    'links' => [],
                ],
            ],
            'table' => [
                'variables' => [
                    'header' => NULL,
                    'rows' => NULL,
                    'footer' => NULL,
                    'attributes' => [],
                    'caption' => NULL,
                    'colgroups' => [],
                    'sticky' => FALSE,
                    'responsive' => TRUE,
                    'empty' => '',
                ],
            ],
            'tablesort_indicator' => [
                'variables' => [
                    'style' => NULL,
                ],
            ],
            'mark' => [
                'variables' => [
                    'status' => MARK_NEW,
                ],
            ],
            'item_list' => [
                'variables' => [
                    'items' => [],
                    'title' => '',
                    'list_type' => 'ul',
                    'wrapper_attributes' => [],
                    'attributes' => [],
                    'empty' => NULL,
                    'context' => [],
                ],
            ],
            'feed_icon' => [
                'variables' => [
                    'url' => NULL,
                    'title' => NULL,
                    'attributes' => [],
                ],
            ],
            'progress_bar' => [
                'variables' => [
                    'label' => NULL,
                    'percent' => NULL,
                    'message' => NULL,
                ],
            ],
            'indentation' => [
                'variables' => [
                    'size' => 1,
                ],
            ],
            // From theme.maintenance.inc.
'maintenance_page' => [
                'render element' => 'page',
            ],
            'install_page' => [
                'render element' => 'page',
            ],
            'maintenance_task_list' => [
                'variables' => [
                    'items' => NULL,
                    'active' => NULL,
                    'variant' => NULL,
                ],
            ],
            'authorize_report' => [
                'variables' => [
                    'messages' => [],
                    'attributes' => [],
                ],
                'includes' => [
                    'core/includes/theme.maintenance.inc',
                ],
                'template' => 'authorize-report',
            ],
            'pager' => [
                'render element' => 'pager',
            ],
            'menu' => [
                'variables' => [
                    'menu_name' => NULL,
                    'items' => [],
                    'attributes' => [],
                ],
            ],
            'menu_local_task' => [
                'render element' => 'element',
            ],
            'menu_local_action' => [
                'render element' => 'element',
            ],
            'menu_local_tasks' => [
                'variables' => [
                    'primary' => [],
                    'secondary' => [],
                ],
            ],
            // From form.inc.
'input' => [
                'render element' => 'element',
            ],
            'select' => [
                'render element' => 'element',
            ],
            'fieldset' => [
                'render element' => 'element',
            ],
            'details' => [
                'render element' => 'element',
            ],
            'radios' => [
                'render element' => 'element',
            ],
            'checkboxes' => [
                'render element' => 'element',
            ],
            'form' => [
                'render element' => 'element',
            ],
            'textarea' => [
                'render element' => 'element',
            ],
            'form_element' => [
                'render element' => 'element',
            ],
            'form_element_label' => [
                'render element' => 'element',
            ],
            'vertical_tabs' => [
                'render element' => 'element',
            ],
            'container' => [
                'render element' => 'element',
            ],
            // From field system.
'field' => [
                'render element' => 'element',
            ],
            'field_multiple_value_form' => [
                'render element' => 'element',
            ],
            'off_canvas_page_wrapper' => [
                'variables' => [
                    'children' => NULL,
                ],
            ],
            'status_report_grouped' => [
                'variables' => [
                    'grouped_requirements' => NULL,
                    'requirements' => NULL,
                ],
            ],
        ];
    }

}