StylePluginBase.php

<?php

/**
 * @file
 * Definition of Drupal\views\Plugin\views\style\StylePluginBase.
 */

namespace Drupal\views\Plugin\views\style;

use Drupal\views\Plugin\views\PluginBase;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\Plugin\views\wizard\WizardInterface;
use Drupal\views\ViewExecutable;

/**
 * @defgroup views_style_plugins Views style plugins
 * @{
 * Style plugins control how a view is rendered. For example, they
 * can choose to display a collection of fields, node_view() output,
 * table output, or any kind of crazy output they want.
 *
 * Many style plugins can have an optional 'row' plugin, that displays
 * a single record. Not all style plugins can utilize this, so it is
 * up to the plugin to set this up and call through to the row plugin.
 */

/**
 * Base class to define a style plugin handler.
 */
abstract class StylePluginBase extends PluginBase {

  /**
   * Overrides Drupal\views\Plugin\Plugin::$usesOptions.
   */
  protected $usesOptions = TRUE;

  /**
   * Store all available tokens row rows.
   */
  var $row_tokens = array();

  /**
   * Does the style plugin allows to use style plugins.
   *
   * @var bool
   */
  protected $usesRowPlugin = FALSE;

  /**
   * Does the style plugin support custom css class for the rows.
   *
   * @var bool
   */
  protected $usesRowClass = FALSE;

  /**
   * Does the style plugin support grouping of rows.
   *
   * @var bool
   */
  protected $usesGrouping = TRUE;

  /**
   * Does the style plugin for itself support to add fields to it's output.
   *
   * This option only makes sense on style plugins without row plugins, like
   * for example table.
   *
   * @var bool
   */
  protected $usesFields = FALSE;

  /**
    * Stores the rendered field values, keyed by the row index and field name.
    *
    * @see \Drupal\views\Plugin\views\style\StylePluginBase::renderFields()
    * @see \Drupal\views\Plugin\views\style\StylePluginBase::getField()
    *
    * @var array|null
    */
  protected $rendered_fields;

  /**
   * The theme function used to render the grouping set.
   *
   * Plugins may override this attribute if they wish to use some other theme
   * function to render the grouping set.
   *
   * @var string
   *
   * @see StylePluginBase::renderGroupingSets()
   */
  protected $groupingTheme = 'views_view_grouping';

  /**
   * Overrides \Drupal\views\Plugin\views\PluginBase::init().
   *
   * The style options might come externally as the style can be sourced from at
   * least two locations. If it's not included, look on the display.
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);

    if ($this->usesRowPlugin() && $display->getOption('row')) {
      $this->view->rowPlugin = $display->getPlugin('row');
    }

    $this->options += array(
      'grouping' => array(),
    );

  }

  public function destroy() {
    parent::destroy();

    if (isset($this->view->rowPlugin)) {
      $this->view->rowPlugin->destroy();
    }
  }

  /**
   * Returns the usesRowPlugin property.
   *
   * @return bool
   */
  function usesRowPlugin() {
    return $this->usesRowPlugin;

  }

  /**
   * Returns the usesRowClass property.
   *
   * @return bool
   */
  function usesRowClass() {
    return $this->usesRowClass;
  }

  /**
   * Returns the usesGrouping property.
   *
   * @return bool
   */
  function usesGrouping() {
    return $this->usesGrouping;
  }

  /**
   * Return TRUE if this style also uses fields.
   *
   * @return bool
   */
  function usesFields() {
    // If we use a row plugin, ask the row plugin. Chances are, we don't
    // care, it does.
    $row_uses_fields = FALSE;
    if ($this->usesRowPlugin() && ($row_plugin = $this->displayHandler->getPlugin('row'))) {
      $row_uses_fields = $row_plugin->usesFields();
    }
    // Otherwise, check the definition or the option.
    return $row_uses_fields || $this->usesFields || !empty($this->options['uses_fields']);
  }

  /**
   * Return TRUE if this style uses tokens.
   *
   * Used to ensure we don't fetch tokens when not needed for performance.
   */
  public function usesTokens() {
    if ($this->usesRowClass()) {
      $class = $this->options['row_class'];
      if (strpos($class, '[') !== FALSE || strpos($class, '!') !== FALSE || strpos($class, '%') !== FALSE) {
        return TRUE;
      }
    }
  }

  /**
   * Return the token replaced row class for the specified row.
   */
  public function getRowClass($row_index) {
    if ($this->usesRowClass()) {
      $class = $this->options['row_class'];
      if ($this->usesFields() && $this->view->field) {
        $class = strip_tags($this->tokenizeValue($class, $row_index));
      }

      $classes = explode(' ', $class);
      foreach ($classes as &$class) {
        $class = drupal_clean_css_identifier($class);
      }
      return implode(' ', $classes);
    }
  }

  /**
   * Take a value and apply token replacement logic to it.
   */
  public function tokenizeValue($value, $row_index) {
    if (strpos($value, '[') !== FALSE || strpos($value, '!') !== FALSE || strpos($value, '%') !== FALSE) {
      // Row tokens might be empty, for example for node row style.
      $tokens = isset($this->row_tokens[$row_index]) ? $this->row_tokens[$row_index] : array();
      if (!empty($this->view->build_info['substitutions'])) {
        $tokens += $this->view->build_info['substitutions'];
      }

      if ($tokens) {
        $value = strtr($value, $tokens);
      }
    }

    return $value;
  }

  /**
   * Should the output of the style plugin be rendered even if it's a empty view.
   */
  public function evenEmpty() {
    return !empty($this->definition['even empty']);
  }

  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['grouping'] = array('default' => array());
    if ($this->usesRowClass()) {
      $options['row_class'] = array('default' => '');
      $options['default_row_class'] = array('default' => TRUE, 'bool' => TRUE);
      $options['row_class_special'] = array('default' => TRUE, 'bool' => TRUE);
    }
    $options['uses_fields'] = array('default' => FALSE, 'bool' => TRUE);

    return $options;
  }

  public function buildOptionsForm(&$form, &$form_state) {
    parent::buildOptionsForm($form, $form_state);
    // Only fields-based views can handle grouping.  Style plugins can also exclude
    // themselves from being groupable by setting their "usesGrouping" property
    // to FALSE.
    // @TODO: Document "usesGrouping" in docs.php when docs.php is written.
    if ($this->usesFields() && $this->usesGrouping()) {
      $options = array('' => t('- None -'));
      $field_labels = $this->displayHandler->getFieldLabels(TRUE);
      $options += $field_labels;
      // If there are no fields, we can't group on them.
      if (count($options) > 1) {
        // This is for backward compatibility, when there was just a single
        // select form.
        if (is_string($this->options['grouping'])) {
          $grouping = $this->options['grouping'];
          $this->options['grouping'] = array();
          $this->options['grouping'][0]['field'] = $grouping;
        }
        if (isset($this->options['group_rendered']) && is_string($this->options['group_rendered'])) {
          $this->options['grouping'][0]['rendered'] = $this->options['group_rendered'];
          unset($this->options['group_rendered']);
        }

        $c = count($this->options['grouping']);
        // Add a form for every grouping, plus one.
        for ($i = 0; $i <= $c; $i++) {
          $grouping = !empty($this->options['grouping'][$i]) ? $this->options['grouping'][$i] : array();
          $grouping += array('field' => '', 'rendered' => TRUE, 'rendered_strip' => FALSE);
          $form['grouping'][$i]['field'] = array(
            '#type' => 'select',
            '#title' => t('Grouping field Nr.@number', array('@number' => $i + 1)),
            '#options' => $options,
            '#default_value' => $grouping['field'],
            '#description' => t('You may optionally specify a field by which to group the records. Leave blank to not group.'),
          );
          $form['grouping'][$i]['rendered'] = array(
            '#type' => 'checkbox',
            '#title' => t('Use rendered output to group rows'),
            '#default_value' => $grouping['rendered'],
            '#description' => t('If enabled the rendered output of the grouping field is used to group the rows.'),
            '#states' => array(
              'invisible' => array(
                ':input[name="style_options[grouping][' . $i . '][field]"]' => array('value' => ''),
              ),
            ),
          );
          $form['grouping'][$i]['rendered_strip'] = array(
            '#type' => 'checkbox',
            '#title' => t('Remove tags from rendered output'),
            '#default_value' => $grouping['rendered_strip'],
            '#states' => array(
              'invisible' => array(
                ':input[name="style_options[grouping][' . $i . '][field]"]' => array('value' => ''),
              ),
            ),
          );
        }
      }
    }

    if ($this->usesRowClass()) {
      $form['row_class'] = array(
        '#title' => t('Row class'),
        '#description' => t('The class to provide on each row.'),
        '#type' => 'textfield',
        '#default_value' => $this->options['row_class'],
      );

      if ($this->usesFields()) {
        $form['row_class']['#description'] .= ' ' . t('You may use field tokens from as per the "Replacement patterns" used in "Rewrite the output of this field" for all fields.');
      }

      $form['default_row_class'] = array(
        '#title' => t('Add views row classes'),
        '#description' => t('Add the default row classes like views-row-1 to the output. You can use this to quickly reduce the amount of markup the view provides by default, at the cost of making it more difficult to apply CSS.'),
        '#type' => 'checkbox',
        '#default_value' => $this->options['default_row_class'],
      );
      $form['row_class_special'] = array(
        '#title' => t('Add striping (odd/even), first/last row classes'),
        '#description' => t('Add css classes to the first and last line, as well as odd/even classes for striping.'),
        '#type' => 'checkbox',
        '#default_value' => $this->options['row_class_special'],
      );
    }

    if (!$this->usesFields() || !empty($this->options['uses_fields'])) {
      $form['uses_fields'] = array(
        '#type' => 'checkbox',
        '#title' => t('Force using fields'),
        '#description' => t('If neither the row nor the style plugin supports fields, this field allows to enable them, so you can for example use groupby.'),
        '#default_value' => $this->options['uses_fields'],
      );
    }
  }

  public function validateOptionsForm(&$form, &$form_state) {
    // Don't run validation on style plugins without the grouping setting.
    if (isset($form_state['values']['style_options']['grouping'])) {
      // Don't save grouping if no field is specified.
      foreach ($form_state['values']['style_options']['grouping'] as $index => $grouping) {
        if (empty($grouping['field'])) {
          unset($form_state['values']['style_options']['grouping'][$index]);
        }
      }
    }
  }

  /**
   * Provide a form in the views wizard if this style is selected.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param array $form_state
   *   An associative array containing the current state of the form.
   * @param string $type
   *    The display type, either block or page.
   */
  public function wizardForm(&$form, &$form_state, $type) {
  }

  /**
   * Alter the options of a display before they are added to the view.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param array $form_state
   *   An associative array containing the current state of the form.
   * @param \Drupal\views\Plugin\views\wizard\WizardInterface $wizard
   *   The current used wizard.
   * @param array $display_options
   *   The options which will be used on the view. The style plugin should
   *   alter this to its own needs.
   * @param string $display_type
   *   The display type, either block or page.
   */
  public function wizardSubmit(&$form, &$form_state, WizardInterface $wizard, &$display_options, $display_type) {
  }

  /**
   * Called by the view builder to see if this style handler wants to
   * interfere with the sorts. If so it should build; if it returns
   * any non-TRUE value, normal sorting will NOT be added to the query.
   */
  public function buildSort() { return TRUE; }

  /**
   * Called by the view builder to let the style build a second set of
   * sorts that will come after any other sorts in the view.
   */
  public function buildSortPost() { }

  /**
   * Allow the style to do stuff before each row is rendered.
   *
   * @param $result
   *   The full array of results from the query.
   */
  public function preRender($result) {
    if (!empty($this->view->rowPlugin)) {
      $this->view->rowPlugin->preRender($result);
    }
  }

  /**
   * Renders a group of rows of the grouped view.
   *
   * @param array $rows
   *   The result rows rendered in this group.
   *
   * @return array
   *   The render array containing the single group theme output.
   */
  protected function renderRowGroup(array $rows = array()) {
    return array(
      '#theme' => $this->themeFunctions(),
      '#view' => $this->view,
      '#rows' => $rows,
    );
  }

  /**
   * Render the display in this style.
   */
  public function render() {
    if ($this->usesRowPlugin() && empty($this->view->rowPlugin)) {
      debug('Drupal\views\Plugin\views\style\StylePluginBase: Missing row plugin');
      return;
    }

    // Group the rows according to the grouping instructions, if specified.
    $sets = $this->renderGrouping(
      $this->view->result,
      $this->options['grouping'],
      TRUE
    );

    return $this->renderGroupingSets($sets);
  }

  /**
   * Render the grouping sets.
   *
   * Plugins may override this method if they wish some other way of handling
   * grouping.
   *
   * @param $sets
   *   Array containing the grouping sets to render.
   * @param $level
   *   Integer indicating the hierarchical level of the grouping.
   *
   * @return string
   *   Rendered output of given grouping sets.
   */
  public function renderGroupingSets($sets, $level = 0) {
    $output = array();
    $theme_functions = $this->view->buildThemeFunctions($this->groupingTheme);
    foreach ($sets as $set) {
      $row = reset($set['rows']);
      // Render as a grouping set.
      if (is_array($row) && isset($row['group'])) {
        $output[] = array(
          '#theme' => $theme_functions,
          '#view' => $this->view,
          '#grouping' => $this->options['grouping'][$level],
          '#grouping_level' => $level,
          '#rows' => $set['rows'],
          '#title' => $set['group'],
        );
      }
      // Render as a record set.
      else {
        if ($this->usesRowPlugin()) {
          foreach ($set['rows'] as $index => $row) {
            $this->view->row_index = $index;
            $render = $this->view->rowPlugin->render($row);
            // Row render arrays cannot be contained by style render arrays.
            $set['rows'][$index] = drupal_render($render);
          }
        }

        $single_output = $this->renderRowGroup($set['rows']);
        $single_output['#grouping_level'] = $level;
        $single_output['#title'] = $set['group'];
        $output[] = $single_output;
      }
    }
    unset($this->view->row_index);
    return $output;
  }

  /**
   * Group records as needed for rendering.
   *
   * @param $records
   *   An array of records from the view to group.
   * @param $groupings
   *   An array of grouping instructions on which fields to group. If empty, the
   *   result set will be given a single group with an empty string as a label.
   * @param $group_rendered
   *   Boolean value whether to use the rendered or the raw field value for
   *   grouping. If set to NULL the return is structured as before
   *   Views 7.x-3.0-rc2. After Views 7.x-3.0 this boolean is only used if
   *   $groupings is an old-style string or if the rendered option is missing
   *   for a grouping instruction.
   * @return
   *   The grouped record set.
   *   A nested set structure is generated if multiple grouping fields are used.
   *
   *   @code
   *   array(
   *     'grouping_field_1:grouping_1' => array(
   *       'group' => 'grouping_field_1:content_1',
   *       'rows' => array(
   *         'grouping_field_2:grouping_a' => array(
   *           'group' => 'grouping_field_2:content_a',
   *           'rows' => array(
   *             $row_index_1 => $row_1,
   *             $row_index_2 => $row_2,
   *             // ...
   *           )
   *         ),
   *       ),
   *     ),
   *     'grouping_field_1:grouping_2' => array(
   *       // ...
   *     ),
   *   )
   *   @endcode
   */
  public function renderGrouping($records, $groupings = array(), $group_rendered = NULL) {
    // This is for backward compatibility, when $groupings was a string
    // containing the ID of a single field.
    if (is_string($groupings)) {
      $rendered = $group_rendered === NULL ? TRUE : $group_rendered;
      $groupings = array(array('field' => $groupings, 'rendered' => $rendered));
    }

    // Make sure fields are rendered
    $this->renderFields($this->view->result);
    $sets = array();
    if ($groupings) {
      foreach ($records as $index => $row) {
        // Iterate through configured grouping fields to determine the
        // hierarchically positioned set where the current row belongs to.
        // While iterating, parent groups, that do not exist yet, are added.
        $set = &$sets;
        foreach ($groupings as $info) {
          $field = $info['field'];
          $rendered = isset($info['rendered']) ? $info['rendered'] : $group_rendered;
          $rendered_strip = isset($info['rendered_strip']) ? $info['rendered_strip'] : FALSE;
          $grouping = '';
          $group_content = '';
          // Group on the rendered version of the field, not the raw.  That way,
          // we can control any special formatting of the grouping field through
          // the admin or theme layer or anywhere else we'd like.
          if (isset($this->view->field[$field])) {
            $group_content = $this->getField($index, $field);
            if ($this->view->field[$field]->options['label']) {
              $group_content = $this->view->field[$field]->options['label'] . ': ' . $group_content;
            }
            if ($rendered) {
              $grouping = $group_content;
              if ($rendered_strip) {
                $group_content = $grouping = strip_tags(htmlspecialchars_decode($group_content));
              }
            }
            else {
              $grouping = $this->getFieldValue($index, $field);
              // Not all field handlers return a scalar value,
              // e.g. views_handler_field_field.
              if (!is_scalar($grouping)) {
                $grouping = hash('sha256', serialize($grouping));
              }
            }
          }

          // Create the group if it does not exist yet.
          if (empty($set[$grouping])) {
            $set[$grouping]['group'] = $group_content;
            $set[$grouping]['rows'] = array();
          }

          // Move the set reference into the row set of the group we just determined.
          $set = &$set[$grouping]['rows'];
        }
        // Add the row to the hierarchically positioned row set we just determined.
        $set[$index] = $row;
      }
    }
    else {
      // Create a single group with an empty grouping field.
      $sets[''] = array(
        'group' => '',
        'rows' => $records,
      );
    }

    // If this parameter isn't explicitely set modify the output to be fully
    // backward compatible to code before Views 7.x-3.0-rc2.
    // @TODO Remove this as soon as possible e.g. October 2020
    if ($group_rendered === NULL) {
      $old_style_sets = array();
      foreach ($sets as $group) {
        $old_style_sets[$group['group']] = $group['rows'];
      }
      $sets = $old_style_sets;
    }

    return $sets;
  }

  /**
   * Renders all of the fields for a given style and store them on the object.
   *
   * @param array $result
   *   The result array from $view->result
   */
  protected function renderFields(array $result) {
    if (!$this->usesFields()) {
      return;
    }

    if (!isset($this->rendered_fields)) {
      $this->rendered_fields = array();
      $this->view->row_index = 0;
      $keys = array_keys($this->view->field);

      // If all fields have a field::access FALSE there might be no fields, so
      // there is no reason to execute this code.
      if (!empty($keys)) {
        foreach ($result as $count => $row) {
          $this->view->row_index = $count;
          foreach ($keys as $id) {
            $this->rendered_fields[$count][$id] = $this->view->field[$id]->theme($row);
          }

          $this->row_tokens[$count] = $this->view->field[$id]->getRenderTokens(array());
        }
      }
      unset($this->view->row_index);
    }
  }

  /**
   * Gets a rendered field.
   *
   * @param int $index
   *   The index count of the row.
   * @param string $field
   *   The ID of the field.
   *
   * @return string|null
   *   The output of the field, or NULL if it was empty.
   */
  public function getField($index, $field) {
    if (!isset($this->rendered_fields)) {
      $this->renderFields($this->view->result);
    }

    if (isset($this->rendered_fields[$index][$field])) {
      return $this->rendered_fields[$index][$field];
    }
  }

  /**
  * Get the raw field value.
  *
  * @param $index
  *   The index count of the row.
  * @param $field
  *    The id of the field.
  */
  protected function getFieldValue($index, $field) {
    $this->view->row_index = $index;
    $value = $this->view->field[$field]->getValue($this->view->result[$index]);
    unset($this->view->row_index);
    return $value;
  }

  public function validate() {
    $errors = parent::validate();

    if ($this->usesRowPlugin()) {
      $plugin = $this->displayHandler->getPlugin('row');
      if (empty($plugin)) {
        $errors[] = t('Style @style requires a row style but the row plugin is invalid.', array('@style' => $this->definition['title']));
      }
      else {
        $result = $plugin->validate();
        if (!empty($result) && is_array($result)) {
          $errors = array_merge($errors, $result);
        }
      }
    }
    return $errors;
  }

  public function query() {
    parent::query();
    if (isset($this->view->rowPlugin)) {
      $this->view->rowPlugin->query();
    }
  }

}

/**
 * @}
 */