views.theme.inc

<?php


/**
 * @file
 * Preprocessors and helper functions to make theming easier.
 */
use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\Xss;
use Drupal\Core\Template\Attribute;
use Drupal\Core\Url;
use Drupal\Core\Utility\TableSort;

/**
 * Prepares variables for view templates.
 *
 * Default template: views-view.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: The ViewExecutable object.
 */
function template_preprocess_views_view(&$variables) {
    $view = $variables['view'];
    $id = $view->storage
        ->id();
    $variables['css_name'] = Html::cleanCssIdentifier($id);
    $variables['id'] = $id;
    $variables['display_id'] = $view->current_display;
    // Override the title to be empty by default. For example, if viewing a page
    // view, 'title' will already be populated in $variables. This can still be
    // overridden to use a title when needed. See views_ui_preprocess_views_view()
    // for an example of this.
    $variables['title'] = '';
    $css_class = $view->display_handler
        ->getOption('css_class');
    if (!empty($css_class)) {
        // Views uses its own sanitization method. This is preserved to keep
        // backwards compatibility.
        // @todo https://www.drupal.org/project/drupal/issues/2977950 Decide what to
        //   do with the backwards compatibility layer.
        $bc_classes = explode(' ', preg_replace('/[^a-zA-Z0-9- ]/', '-', $css_class));
        // Sanitize the classes using the classes using the proper API.
        $sanitized_classes = array_map('\\Drupal\\Component\\Utility\\Html::cleanCssIdentifier', explode(' ', $css_class));
        $view_classes = array_unique(array_merge($bc_classes, $sanitized_classes));
        // Merge the view display classes into any existing classes if they exist.
        $variables['attributes']['class'] = !empty($variables['attributes']['class']) ? array_merge($variables['attributes']['class'], $view_classes) : $view_classes;
        $variables['css_class'] = implode(' ', $view_classes);
    }
    // contextual_preprocess() only works on render elements, and since this theme
    // hook is not for a render element, contextual_preprocess() falls back to the
    // first argument and checks if that is a render element. The first element is
    // view_array. However, view_array does not get set anywhere, but since we do
    // have access to the View object, we can also access the View object's
    // element, which is a render element that does have #contextual_links set if
    // the display supports it. Doing this allows contextual_preprocess() to
    // access this theme hook's render element, and therefore allows this template
    // to have contextual links.
    // @see views_theme()
    $variables['view_array'] = $variables['view']->element;
    // Attachments are always updated with the outer view, never by themselves,
    // so they do not have dom ids.
    if (empty($view->is_attachment)) {
        // Our JavaScript needs to have some means to find the HTML belonging to
        // this view.
        //
        // It is true that the DIV wrapper has classes denoting the name of the view
        // and its display ID, but this is not enough to unequivocally match a view
        // with its HTML, because one view may appear several times on the page. So
        // we set up a hash with the current time, $dom_id, to issue a "unique"
        // identifier for each view. This identifier is written to both
        // drupalSettings and the DIV wrapper.
        $variables['dom_id'] = $view->dom_id;
    }
}

/**
 * Prepares variables for views fields templates.
 *
 * Default template: views-view-fields.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: The view object.
 *   - options: An array of options. Each option contains:
 *     - inline: An array that contains the fields that are to be
 *       displayed inline.
 *     - default_field_elements: If default field wrapper
 *       elements are to be provided.
 *     - hide_empty: Whether the field is to be hidden if empty.
 *     - element_default_classes: If the default classes are to be added.
 *     - separator: A string to be placed between inline fields to keep them
 *       visually distinct.
 *    - row: An array containing information about the current row.
 */
function template_preprocess_views_view_fields(&$variables) {
    $view = $variables['view'];
    // Loop through the fields for this view.
    $previous_inline = FALSE;
    // Ensure it's at least an empty array.
    $variables['fields'] = [];
    
    /** @var \Drupal\views\ResultRow $row */
    $row = $variables['row'];
    foreach ($view->field as $id => $field) {
        // render this even if set to exclude so it can be used elsewhere.
        $field_output = $view->style_plugin
            ->getField($row->index, $id);
        $empty = $field->isValueEmpty($field_output, $field->options['empty_zero']);
        if (empty($field->options['exclude']) && (!$empty || empty($field->options['hide_empty']) && empty($variables['options']['hide_empty']))) {
            $object = new stdClass();
            $object->handler = $view->field[$id];
            $object->inline = !empty($variables['options']['inline'][$id]);
            // Set up default value of the flag that indicates whether to display a
            // colon after the label.
            $object->has_label_colon = FALSE;
            $object->element_type = $object->handler
                ->elementType(TRUE, !$variables['options']['default_field_elements'], $object->inline);
            if ($object->element_type) {
                $attributes = [];
                if ($object->handler->options['element_default_classes']) {
                    $attributes['class'][] = 'field-content';
                }
                if ($classes = $object->handler
                    ->elementClasses($row->index)) {
                    $attributes['class'][] = $classes;
                }
                $object->element_attributes = new Attribute($attributes);
            }
            $object->content = $field_output;
            if (isset($view->field[$id]->field_alias) && isset($row->{$view->field[$id]->field_alias})) {
                $object->raw = $row->{$view->field[$id]->field_alias};
            }
            else {
                // Make sure it exists to reduce NOTICE.
                $object->raw = NULL;
            }
            if (!empty($variables['options']['separator']) && $previous_inline && $object->inline && $object->content) {
                $object->separator = [
                    '#markup' => $variables['options']['separator'],
                ];
            }
            $object->class = Html::cleanCssIdentifier($id);
            $previous_inline = $object->inline;
            // Set up field wrapper element.
            $object->wrapper_element = $object->handler
                ->elementWrapperType(TRUE, TRUE);
            if ($object->wrapper_element === '' && $variables['options']['default_field_elements']) {
                $object->wrapper_element = $object->inline ? 'span' : 'div';
            }
            // Set up field wrapper attributes if field wrapper was set.
            if ($object->wrapper_element) {
                $attributes = [];
                if ($object->handler->options['element_default_classes']) {
                    $attributes['class'][] = 'views-field';
                    $attributes['class'][] = 'views-field-' . $object->class;
                }
                if ($classes = $object->handler
                    ->elementWrapperClasses($row->index)) {
                    $attributes['class'][] = $classes;
                }
                $object->wrapper_attributes = new Attribute($attributes);
            }
            // Set up field label
            $object->label = $view->field[$id]
                ->label();
            // Set up field label wrapper and its attributes.
            if ($object->label) {
                // Add a colon in a label suffix.
                if ($object->handler->options['element_label_colon']) {
                    $object->label_suffix = ': ';
                    $object->has_label_colon = TRUE;
                }
                // Set up label HTML element.
                $object->label_element = $object->handler
                    ->elementLabelType(TRUE, !$variables['options']['default_field_elements']);
                // Set up label attributes.
                if ($object->label_element) {
                    $attributes = [];
                    if ($object->handler->options['element_default_classes']) {
                        $attributes['class'][] = 'views-label';
                        $attributes['class'][] = 'views-label-' . $object->class;
                    }
                    // Set up field label.
                    $element_label_class = $object->handler
                        ->elementLabelClasses($row->index);
                    if ($element_label_class) {
                        $attributes['class'][] = $element_label_class;
                    }
                    $object->label_attributes = new Attribute($attributes);
                }
            }
            $variables['fields'][$id] = $object;
        }
    }
}

/**
 * Prepares variables for views single grouping templates.
 *
 * Default template: views-view-grouping.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: The view object.
 *   - rows: The rows returned from the view.
 *   - grouping_level: Integer indicating the hierarchical level of the
 *     grouping.
 *   - content: The content to be grouped.
 *   - title: The group heading.
 */
function template_preprocess_views_view_grouping(&$variables) {
    $variables['content'] = $variables['view']->style_plugin
        ->renderGroupingSets($variables['rows'], $variables['grouping_level']);
}

/**
 * Prepares variables for views field templates.
 *
 * Default template: views-view-field.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - field: The field handler object for the current field.
 *   - row: Object representing the raw result of the SQL query for the current
 *     field.
 *   - view: Instance of the ViewExecutable object for the parent view.
 */
function template_preprocess_views_view_field(&$variables) {
    $variables['output'] = $variables['field']->advancedRender($variables['row']);
}

/**
 * Prepares variables for views summary templates.
 *
 * The summary prints a single record from a row, with fields.
 *
 * Default template: views-view-summary.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 */
function template_preprocess_views_view_summary(&$variables) {
    
    /** @var \Drupal\views\ViewExecutable $view */
    $view = $variables['view'];
    $argument = $view->argument[$view->build_info['summary_level']];
    $url_options = [];
    if (!empty($view->exposed_raw_input)) {
        $url_options['query'] = $view->exposed_raw_input;
    }
    $active_urls = [
        // Force system path.
Url::fromRoute('<current>', [], [
            'alias' => TRUE,
        ])->toString(),
        // Force system path.
Url::fromRouteMatch(\Drupal::routeMatch())->setOption('alias', TRUE)
            ->toString(),
        // Could be an alias.
Url::fromRoute('<current>')->toString(),
        // Could be an alias.
Url::fromRouteMatch(\Drupal::routeMatch())->toString(),
    ];
    $active_urls = array_combine($active_urls, $active_urls);
    // Collect all arguments foreach row, to be able to alter them for example
    // by the validator. This is not done per single argument value, because this
    // could cause performance problems.
    $row_args = [];
    foreach ($variables['rows'] as $id => $row) {
        $row_args[$id] = $argument->summaryArgument($row);
    }
    $argument->processSummaryArguments($row_args);
    foreach ($variables['rows'] as $id => $row) {
        $variables['rows'][$id]->attributes = [];
        $variables['rows'][$id]->link = $argument->summaryName($row);
        $args = $view->args;
        $args[$argument->position] = $row_args[$id];
        if (!empty($argument->options['summary_options']['base_path'])) {
            $base_path = $argument->options['summary_options']['base_path'];
            $tokens = $view->getDisplay()
                ->getArgumentsTokens();
            $base_path = $argument->globalTokenReplace($base_path, $tokens);
            // @todo Views should expect and store a leading /. See:
            //   https://www.drupal.org/node/2423913
            $url = Url::fromUserInput('/' . $base_path);
            try {
                
                /** @var \Symfony\Component\Routing\Route $route */
                $route_name = $url->getRouteName();
                $route = \Drupal::service('router.route_provider')->getRouteByName($route_name);
                $route_variables = $route->compile()
                    ->getVariables();
                $parameters = $url->getRouteParameters();
                foreach ($route_variables as $variable_name) {
                    $parameters[$variable_name] = array_shift($args);
                }
                $url->setRouteParameters($parameters);
            } catch (Exception $e) {
                // If the given route doesn't exist, default to <front>
                $url = Url::fromRoute('<front>');
            }
        }
        else {
            $url = $view->getUrl($args)
                ->setOptions($url_options);
        }
        $variables['rows'][$id]->url = $url->toString();
        $variables['rows'][$id]->count = intval($row->{$argument->count_alias});
        $variables['rows'][$id]->attributes = new Attribute($variables['rows'][$id]->attributes);
        $variables['rows'][$id]->active = isset($active_urls[$variables['rows'][$id]->url]);
    }
}

/**
 * Prepares variables for unformatted summary view templates.
 *
 * Default template: views-view-summary-unformatted.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 *   - options: An array of options. Each option contains:
 *     - separator: A string to be placed between inline fields to keep them
 *       visually distinct.
 */
function template_preprocess_views_view_summary_unformatted(&$variables) {
    
    /** @var \Drupal\views\ViewExecutable $view */
    $view = $variables['view'];
    $argument = $view->argument[$view->build_info['summary_level']];
    $url_options = [];
    if (!empty($view->exposed_raw_input)) {
        $url_options['query'] = $view->exposed_raw_input;
    }
    $count = 0;
    $active_urls = [
        // Force system path.
Url::fromRoute('<current>', [], [
            'alias' => TRUE,
        ])->toString(),
        // Could be an alias.
Url::fromRoute('<current>')->toString(),
    ];
    $active_urls = array_combine($active_urls, $active_urls);
    // Collect all arguments for each row, to be able to alter them for example
    // by the validator. This is not done per single argument value, because
    // this could cause performance problems.
    $row_args = [];
    foreach ($variables['rows'] as $id => $row) {
        $row_args[$id] = $argument->summaryArgument($row);
    }
    $argument->processSummaryArguments($row_args);
    foreach ($variables['rows'] as $id => $row) {
        // Only false on first time.
        if ($count++) {
            $variables['rows'][$id]->separator = Xss::filterAdmin($variables['options']['separator']);
        }
        $variables['rows'][$id]->attributes = [];
        $variables['rows'][$id]->link = $argument->summaryName($row);
        $args = $view->args;
        $args[$argument->position] = $row_args[$id];
        if (!empty($argument->options['summary_options']['base_path'])) {
            $base_path = $argument->options['summary_options']['base_path'];
            $tokens = $view->getDisplay()
                ->getArgumentsTokens();
            $base_path = $argument->globalTokenReplace($base_path, $tokens);
            // @todo Views should expect and store a leading /. See:
            //   https://www.drupal.org/node/2423913
            $url = Url::fromUserInput('/' . $base_path);
            try {
                
                /** @var \Symfony\Component\Routing\Route $route */
                $route = \Drupal::service('router.route_provider')->getRouteByName($url->getRouteName());
                $route_variables = $route->compile()
                    ->getVariables();
                $parameters = $url->getRouteParameters();
                foreach ($route_variables as $variable_name) {
                    $parameters[$variable_name] = array_shift($args);
                }
                $url->setRouteParameters($parameters);
            } catch (Exception $e) {
                // If the given route doesn't exist, default to <front>
                $url = Url::fromRoute('<front>');
            }
        }
        else {
            $url = $view->getUrl($args)
                ->setOptions($url_options);
        }
        $variables['rows'][$id]->url = $url->toString();
        $variables['rows'][$id]->count = intval($row->{$argument->count_alias});
        $variables['rows'][$id]->active = isset($active_urls[$variables['rows'][$id]->url]);
        $variables['rows'][$id]->attributes = new Attribute($variables['rows'][$id]->attributes);
    }
}

/**
 * Prepares variables for views table templates.
 *
 * Default template: views-view-table.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 */
function template_preprocess_views_view_table(&$variables) {
    $view = $variables['view'];
    // We need the raw data for this grouping, which is passed in
    // as $variables['rows'].
    // However, the template also needs to use for the rendered fields.  We
    // therefore swap the raw data out to a new variable and reset $variables['rows']
    // so that it can get rebuilt.
    // Store rows so that they may be used by further preprocess functions.
    $result = $variables['result'] = $variables['rows'];
    $variables['rows'] = [];
    $variables['header'] = [];
    $options = $view->style_plugin->options;
    $handler = $view->style_plugin;
    $fields =& $view->field;
    $columns = $handler->sanitizeColumns($options['columns'], $fields);
    $active = !empty($handler->active) ? $handler->active : '';
    $order = !empty($handler->order) ? $handler->order : 'asc';
    // A boolean variable which stores whether the table has a responsive class.
    $responsive = FALSE;
    // For the actual site we want to not render full URLs, because this would
    // make pagers cacheable per URL, which is problematic in blocks, for example.
    // For the actual live preview though the javascript relies on properly
    // working URLs.
    $route_name = !empty($view->live_preview) ? '<current>' : '<none>';
    $query = TableSort::getQueryParameters(\Drupal::request());
    if (isset($view->exposed_raw_input)) {
        $query += $view->exposed_raw_input;
    }
    // A boolean to store whether the table's header has any labels.
    $has_header_labels = FALSE;
    foreach ($columns as $field => $column) {
        // Create a second variable so we can easily find what fields we have and
        // what the CSS classes should be.
        $variables['fields'][$field] = Html::cleanCssIdentifier($field);
        if ($active == $field) {
            $variables['fields'][$field] .= ' is-active';
        }
        // Render the header labels.
        if ($field == $column && empty($fields[$field]->options['exclude'])) {
            $label = !empty($fields[$field]) ? $fields[$field]->label() : '';
            if (empty($options['info'][$field]['sortable']) || !$fields[$field]->clickSortable()) {
                $variables['header'][$field]['content'] = $label;
            }
            else {
                $initial = !empty($options['info'][$field]['default_sort_order']) ? $options['info'][$field]['default_sort_order'] : 'asc';
                if ($active == $field) {
                    $initial = $order == 'asc' ? 'desc' : 'asc';
                }
                $title = t('sort by @s', [
                    '@s' => $label,
                ]);
                if ($active == $field) {
                    $variables['header'][$field]['sort_indicator'] = [
                        '#theme' => 'tablesort_indicator',
                        '#style' => $initial,
                    ];
                }
                $query['order'] = $field;
                $query['sort'] = $initial;
                $link_options = [
                    'query' => $query,
                ];
                $url = new Url($route_name, [], $link_options);
                $variables['header'][$field]['url'] = $url->toString();
                $variables['header'][$field]['content'] = $label;
                $variables['header'][$field]['title'] = $title;
            }
            $variables['header'][$field]['default_classes'] = $fields[$field]->options['element_default_classes'];
            // Set up the header label class.
            $variables['header'][$field]['attributes'] = [];
            $class = $fields[$field]->elementLabelClasses(0);
            if ($class) {
                $variables['header'][$field]['attributes']['class'][] = $class;
            }
            // Add responsive header classes.
            if (!empty($options['info'][$field]['responsive'])) {
                $variables['header'][$field]['attributes']['class'][] = $options['info'][$field]['responsive'];
                $responsive = TRUE;
            }
            // Add a CSS align class to each field if one was set.
            if (!empty($options['info'][$field]['align'])) {
                $variables['header'][$field]['attributes']['class'][] = Html::cleanCssIdentifier($options['info'][$field]['align']);
            }
            // Add a header label wrapper if one was selected.
            if ($variables['header'][$field]['content']) {
                $element_label_type = $fields[$field]->elementLabelType(TRUE, TRUE);
                if ($element_label_type) {
                    $variables['header'][$field]['wrapper_element'] = $element_label_type;
                }
                // Improves accessibility of complex tables.
                $variables['header'][$field]['attributes']['id'] = Html::getUniqueId('view-' . $field . '-table-column');
            }
            // Check if header label is not empty.
            if (!empty($variables['header'][$field]['content'])) {
                $has_header_labels = TRUE;
            }
            $variables['header'][$field]['attributes'] = new Attribute($variables['header'][$field]['attributes']);
        }
        // Add a CSS align class to each field if one was set.
        if (!empty($options['info'][$field]['align'])) {
            $variables['fields'][$field] .= ' ' . Html::cleanCssIdentifier($options['info'][$field]['align']);
        }
        // Render each field into its appropriate column.
        foreach ($result as $num => $row) {
            // Skip building the attributes and content if the field is to be excluded
            // from the display.
            if (!empty($fields[$field]->options['exclude'])) {
                continue;
            }
            // Reference to the column in the loop to make the code easier to read.
            $column_reference =& $variables['rows'][$num]['columns'][$column];
            $column_reference['default_classes'] = $fields[$field]->options['element_default_classes'];
            // Set the field key to the column so it can be used for adding classes
            // in a template.
            $column_reference['fields'][] = $variables['fields'][$field];
            // Add field classes.
            if (!isset($column_reference['attributes'])) {
                $column_reference['attributes'] = [];
            }
            if ($classes = $fields[$field]->elementClasses($num)) {
                $column_reference['attributes']['class'][] = $classes;
            }
            // Add responsive header classes.
            if (!empty($options['info'][$field]['responsive'])) {
                $column_reference['attributes']['class'][] = $options['info'][$field]['responsive'];
            }
            // Improves accessibility of complex tables.
            if (isset($variables['header'][$field]['attributes']['id'])) {
                $column_reference['attributes']['headers'] = [
                    $variables['header'][$field]['attributes']['id'],
                ];
            }
            if (!empty($fields[$field])) {
                $field_output = $handler->getField($num, $field);
                $column_reference['wrapper_element'] = $fields[$field]->elementType(TRUE, TRUE);
                if (!isset($column_reference['content'])) {
                    $column_reference['content'] = [];
                }
                // Only bother with separators and stuff if the field shows up.
                // Place the field into the column, along with an optional separator.
                if (trim($field_output) != '') {
                    if (!empty($column_reference['content']) && !empty($options['info'][$column]['separator'])) {
                        $column_reference['content'][] = [
                            'separator' => [
                                '#markup' => $options['info'][$column]['separator'],
                            ],
                            'field_output' => [
                                '#markup' => $field_output,
                            ],
                        ];
                    }
                    else {
                        $column_reference['content'][] = [
                            'field_output' => [
                                '#markup' => $field_output,
                            ],
                        ];
                    }
                }
            }
            $column_reference['attributes'] = new Attribute($column_reference['attributes']);
        }
        // Remove columns if the "empty_column" option is checked and the
        // field is empty.
        if (!empty($options['info'][$field]['empty_column'])) {
            $empty = TRUE;
            foreach ($variables['rows'] as $columns) {
                $empty &= empty($columns['columns'][$column]['content']);
            }
            if ($empty) {
                foreach ($variables['rows'] as &$column_items) {
                    unset($column_items['columns'][$column]);
                }
                unset($variables['header'][$column]);
            }
        }
    }
    // Hide table header if all labels are empty.
    if (!$has_header_labels) {
        $variables['header'] = [];
    }
    foreach ($variables['rows'] as $num => $row) {
        $variables['rows'][$num]['attributes'] = [];
        if ($row_class = $handler->getRowClass($num)) {
            $variables['rows'][$num]['attributes']['class'][] = $row_class;
        }
        $variables['rows'][$num]['attributes'] = new Attribute($variables['rows'][$num]['attributes']);
    }
    if (empty($variables['rows']) && !empty($options['empty_table'])) {
        $build = $view->display_handler
            ->renderArea('empty');
        $variables['rows'][0]['columns'][0]['content'][0]['field_output'] = $build;
        $variables['rows'][0]['attributes'] = new Attribute([
            'class' => [
                'odd',
            ],
        ]);
        // Calculate the amounts of rows with output.
        $variables['rows'][0]['columns'][0]['attributes'] = new Attribute([
            'colspan' => count($variables['header']),
            'class' => [
                'views-empty',
            ],
        ]);
    }
    $variables['sticky'] = FALSE;
    if (!empty($options['sticky'])) {
        $variables['view']->element['#attached']['library'][] = 'core/drupal.tableheader';
        $variables['sticky'] = TRUE;
    }
    // Add the caption to the list if set.
    if (!empty($handler->options['caption'])) {
        $variables['caption'] = [
            '#markup' => $handler->options['caption'],
        ];
        $variables['caption_needed'] = TRUE;
    }
    elseif (!empty($variables['title'])) {
        $variables['caption'] = [
            '#markup' => $variables['title'],
        ];
        $variables['caption_needed'] = TRUE;
    }
    else {
        $variables['caption'] = '';
        $variables['caption_needed'] = FALSE;
    }
    // For backwards compatibility, initialize the 'summary' and 'description'
    // variables, although core templates now all use 'summary_element' instead.
    $variables['summary'] = $handler->options['summary'];
    $variables['description'] = $handler->options['description'];
    if (!empty($handler->options['summary']) || !empty($handler->options['description'])) {
        $variables['summary_element'] = [
            '#type' => 'details',
            '#title' => $handler->options['summary'],
            // To ensure that the description is properly escaped during rendering,
            // use an 'inline_template' to let Twig do its magic, instead of 'markup'.
'description' => [
                '#type' => 'inline_template',
                '#template' => '{{ description }}',
                '#context' => [
                    'description' => $handler->options['description'],
                ],
            ],
        ];
        $variables['caption_needed'] = TRUE;
    }
    $variables['responsive'] = FALSE;
    // If the table has headers and it should react responsively to columns hidden
    // with the classes represented by the constants RESPONSIVE_PRIORITY_MEDIUM
    // and RESPONSIVE_PRIORITY_LOW, add the tableresponsive behaviors.
    if (isset($variables['header']) && $responsive) {
        $variables['view']->element['#attached']['library'][] = 'core/drupal.tableresponsive';
        // Add 'responsive-enabled' class to the table to identify it for JS.
        // This is needed to target tables constructed by this function.
        $variables['responsive'] = TRUE;
    }
}

/**
 * Prepares variables for views grid style templates.
 *
 * Default template: views-view-grid.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: The view object.
 *   - rows: An array of row items. Each row is an array of content.
 */
function template_preprocess_views_view_grid(&$variables) {
    $options = $variables['options'] = $variables['view']->style_plugin->options;
    $horizontal = $options['alignment'] === 'horizontal';
    $col = 0;
    $row = 0;
    $items = [];
    $remainders = count($variables['rows']) % $options['columns'];
    $num_rows = floor(count($variables['rows']) / $options['columns']);
    // Iterate over each rendered views result row.
    foreach ($variables['rows'] as $result_index => $item) {
        // Add the item.
        if ($horizontal) {
            $items[$row]['content'][$col]['content'] = $item;
        }
        else {
            $items[$col]['content'][$row]['content'] = $item;
        }
        // Create attributes for rows.
        if (!$horizontal || $horizontal && empty($items[$row]['attributes'])) {
            $row_attributes = [
                'class' => [],
            ];
            // Add custom row classes.
            $row_class = array_filter(explode(' ', $variables['view']->style_plugin
                ->getCustomClass($result_index, 'row')));
            if (!empty($row_class)) {
                $row_attributes['class'] = array_merge($row_attributes['class'], $row_class);
            }
            // Add row attributes to the item.
            if ($horizontal) {
                $items[$row]['attributes'] = new Attribute($row_attributes);
            }
            else {
                $items[$col]['content'][$row]['attributes'] = new Attribute($row_attributes);
            }
        }
        // Create attributes for columns.
        if ($horizontal || !$horizontal && empty($items[$col]['attributes'])) {
            $col_attributes = [
                'class' => [],
            ];
            // Add default views column classes.
            // Add custom column classes.
            $col_class = array_filter(explode(' ', $variables['view']->style_plugin
                ->getCustomClass($result_index, 'col')));
            if (!empty($col_class)) {
                $col_attributes['class'] = array_merge($col_attributes['class'], $col_class);
            }
            // Add automatic width for columns.
            if ($options['automatic_width']) {
                $col_attributes['style'] = 'width: ' . 100 / $options['columns'] . '%;';
            }
            // Add column attributes to the item.
            if ($horizontal) {
                $items[$row]['content'][$col]['attributes'] = new Attribute($col_attributes);
            }
            else {
                $items[$col]['attributes'] = new Attribute($col_attributes);
            }
        }
        // Increase, decrease or reset appropriate integers.
        if ($horizontal) {
            if ($col == 0 && $col != $options['columns'] - 1) {
                $col++;
            }
            elseif ($col >= $options['columns'] - 1) {
                $col = 0;
                $row++;
            }
            else {
                $col++;
            }
        }
        else {
            $row++;
            if (!$remainders && $row == $num_rows) {
                $row = 0;
                $col++;
            }
            elseif ($remainders && $row == $num_rows + 1) {
                $row = 0;
                $col++;
                $remainders--;
            }
        }
    }
    // Add items to the variables array.
    $variables['items'] = $items;
}

/**
 * Prepares variables for views unformatted rows templates.
 *
 * Default template: views-view-unformatted.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: The view object.
 *   - rows: An array of row items. Each row is an array of content.
 */
function template_preprocess_views_view_unformatted(&$variables) {
    $view = $variables['view'];
    $rows = $variables['rows'];
    $style = $view->style_plugin;
    $options = $style->options;
    $variables['default_row_class'] = !empty($options['default_row_class']);
    foreach ($rows as $id => $row) {
        $variables['rows'][$id] = [];
        $variables['rows'][$id]['content'] = $row;
        $variables['rows'][$id]['attributes'] = new Attribute();
        if ($row_class = $view->style_plugin
            ->getRowClass($id)) {
            $variables['rows'][$id]['attributes']->addClass($row_class);
        }
    }
}

/**
 * Prepares variables for Views HTML list templates.
 *
 * Default template: views-view-list.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A View object.
 */
function template_preprocess_views_view_list(&$variables) {
    $handler = $variables['view']->style_plugin;
    // Fetch classes from handler options.
    if ($handler->options['class']) {
        $class = explode(' ', $handler->options['class']);
        $class = array_map('\\Drupal\\Component\\Utility\\Html::cleanCssIdentifier', $class);
        // Initialize a new attribute class for $class.
        $variables['list']['attributes'] = new Attribute([
            'class' => $class,
        ]);
    }
    // Fetch wrapper classes from handler options.
    if ($handler->options['wrapper_class']) {
        $wrapper_class = explode(' ', $handler->options['wrapper_class']);
        $variables['attributes']['class'] = array_map('\\Drupal\\Component\\Utility\\Html::cleanCssIdentifier', $wrapper_class);
    }
    $variables['list']['type'] = $handler->options['type'];
    template_preprocess_views_view_unformatted($variables);
}

/**
 * Prepares variables for RSS feed templates.
 *
 * Default template: views-view-rss.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 */
function template_preprocess_views_view_rss(&$variables) {
    $view = $variables['view'];
    $items = $variables['rows'];
    $style = $view->style_plugin;
    $config = \Drupal::config('system.site');
    // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
    // We strip all HTML tags, but need to prevent double encoding from properly
    // escaped source data (such as &amp becoming &amp;amp;).
    $variables['description'] = Html::decodeEntities(strip_tags($style->getDescription()));
    if ($view->display_handler
        ->getOption('sitename_title')) {
        $title = $config->get('name');
        if ($slogan = $config->get('slogan')) {
            $title .= ' - ' . $slogan;
        }
    }
    else {
        $title = $view->getTitle();
    }
    $variables['title'] = $title;
    $variables['link'] = Url::fromRoute('<front>')->setAbsolute()
        ->toString();
    $variables['langcode'] = \Drupal::languageManager()->getCurrentLanguage()
        ->getId();
    $variables['namespaces'] = new Attribute($style->namespaces);
    $variables['items'] = $items;
    $variables['channel_elements'] = $style->channel_elements;
    // During live preview we don't want to output the header since the contents
    // of the feed are being displayed inside a normal HTML page.
    if (empty($variables['view']->live_preview)) {
        $variables['view']->getResponse()->headers
            ->set('Content-Type', 'application/rss+xml; charset=utf-8');
    }
}

/**
 * Prepares variables for views RSS item templates.
 *
 * Default template: views-view-row-rss.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - row: The raw results rows.
 */
function template_preprocess_views_view_row_rss(&$variables) {
    $item = $variables['row'];
    $variables['title'] = $item->title;
    $variables['link'] = $item->link;
    // The description is the only place where we should find HTML.
    // @see https://validator.w3.org/feed/docs/rss2.html#hrelementsOfLtitemgt
    // If we have a render array, render it here and pass the result to the
    // template, letting Twig autoescape it.
    if (isset($item->description) && is_array($item->description)) {
        $variables['description'] = (string) \Drupal::service('renderer')->render($item->description);
    }
    $variables['item_elements'] = [];
    foreach ($item->elements as $element) {
        if (isset($element['attributes']) && is_array($element['attributes'])) {
            $element['attributes'] = new Attribute($element['attributes']);
        }
        $variables['item_elements'][] = $element;
    }
}

/**
 * Prepares variables for OPML feed templates.
 *
 * Default template: views-view-opml.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - view: A ViewExecutable object.
 *   - rows: The raw row data.
 */
function template_preprocess_views_view_opml(&$variables) {
    $view = $variables['view'];
    $items = $variables['rows'];
    $config = \Drupal::config('system.site');
    if ($view->display_handler
        ->getOption('sitename_title')) {
        $title = $config->get('name');
        if ($slogan = $config->get('slogan')) {
            $title .= ' - ' . $slogan;
        }
    }
    else {
        $title = $view->getTitle();
    }
    $variables['title'] = $title;
    $variables['items'] = $items;
    $variables['updated'] = gmdate(DATE_RFC2822, REQUEST_TIME);
    // During live preview we don't want to output the header since the contents
    // of the feed are being displayed inside a normal HTML page.
    if (empty($variables['view']->live_preview)) {
        $variables['view']->getResponse()->headers
            ->set('Content-Type', 'text/xml; charset=utf-8');
    }
}

/**
 * Prepares variables for views OPML item templates.
 *
 * Default template: views-view-row-opml.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - row: The raw results rows.
 */
function template_preprocess_views_view_row_opml(&$variables) {
    $item = $variables['row'];
    $variables['attributes'] = new Attribute($item);
}

/**
 * Prepares variables for views exposed form templates.
 *
 * Default template: views-exposed-form.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - form: A render element representing the form.
 */
function template_preprocess_views_exposed_form(&$variables) {
    $form =& $variables['form'];
    if (!empty($form['q'])) {
        $variables['q'] = $form['q'];
    }
    foreach ($form['#info'] as $info) {
        if (!empty($info['label'])) {
            $form[$info['value']]['#title'] = $info['label'];
        }
        if (!empty($info['description'])) {
            $form[$info['value']]['#description'] = $info['description'];
        }
    }
}

/**
 * Prepares variables for views mini-pager templates.
 *
 * Default template: views-mini-pager.html.twig.
 *
 * @param array $variables
 *   An associative array containing:
 *   - tags: Provides link text for the next/previous links.
 *   - element: The pager's id.
 *   - parameters: Any extra GET parameters that should be retained, such as
 *     exposed input.
 */
function template_preprocess_views_mini_pager(&$variables) {
    
    /* @var $pager_manager \Drupal\Core\Pager\PagerManagerInterface */
    $pager_manager = \Drupal::service('pager.manager');
    $tags =& $variables['tags'];
    $element = $variables['element'];
    $parameters = $variables['parameters'];
    $pager = $pager_manager->getPager($element);
    if (!$pager) {
        return;
    }
    $current = $pager->getCurrentPage();
    $total = $pager->getTotalPages();
    // Current is the page we are currently paged to.
    $variables['items']['current'] = $current + 1;
    if ($total > 1 && $current > 0) {
        $options = [
            'query' => $pager_manager->getUpdatedParameters($parameters, $element, $current - 1),
        ];
        $variables['items']['previous']['href'] = Url::fromRoute('<current>', [], $options)->toString();
        if (isset($tags[1])) {
            $variables['items']['previous']['text'] = $tags[1];
        }
        $variables['items']['previous']['attributes'] = new Attribute();
    }
    if ($current < $total - 1) {
        $options = [
            'query' => $pager_manager->getUpdatedParameters($parameters, $element, $current + 1),
        ];
        $variables['items']['next']['href'] = Url::fromRoute('<current>', [], $options)->toString();
        if (isset($tags[3])) {
            $variables['items']['next']['text'] = $tags[3];
        }
        $variables['items']['next']['attributes'] = new Attribute();
    }
    // This is based on the entire current query string. We need to ensure
    // cacheability is affected accordingly.
    $variables['#cache']['contexts'][] = 'url.query_args';
    $variables['heading_id'] = Html::getUniqueId('pagination-heading');
}

/**
 * @defgroup views_templates Views template files
 * @{
 * Describes various views templates & overriding options.
 *
 * All views templates can be overridden with a variety of names, using
 * the view, the display ID of the view, the display type of the view,
 * or some combination thereof.
 *
 * For each view, there will be a minimum of two templates used. The first
 * is used for all views: views-view.html.twig.
 *
 * The second template is determined by the style selected for the view. Note
 * that certain aspects of the view can also change which style is used; for
 * example, arguments which provide a summary view might change the style to
 * one of the special summary styles.
 *
 * The default style for all views is views-view-unformatted.html.twig.
 *
 * Many styles will then farm out the actual display of each row to a row
 * style; the default row style is views-view-fields.html.twig.
 *
 * Here is an example of all the templates that will be tried in the following
 * case:
 *
 * View, named foobar. Style: unformatted. Row style: Fields. Display: Page.
 *
 * - views-view--foobar--page.html.twig
 * - views-view--page.html.twig
 * - views-view--foobar.html.twig
 * - views-view.html.twig
 *
 * - views-view-unformatted--foobar--page.html.twig
 * - views-view-unformatted--page.html.twig
 * - views-view-unformatted--foobar.html.twig
 * - views-view-unformatted.html.twig
 *
 * - views-view-fields--foobar--page.html.twig
 * - views-view-fields--page.html.twig
 * - views-view-fields--foobar.html.twig
 * - views-view-fields.html.twig
 *
 * Important! When adding a new template to your theme, be sure to flush the
 * theme registry cache!
 *
 * @ingroup views_overview
 * @see \Drupal\views\ViewExecutable::buildThemeFunctions()
 * @}
 */