Add initial EDTFYear processor

src/Plugin/search_api/processor/EDTFYear.php

@@ -0,0 +1,177 @@
+<?php
+
+namespace Drupal\controlled_access_terms\Plugin\search_api\processor;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\PluginFormInterface;
+use Drupal\search_api\Datasource\DatasourceInterface;
+use Drupal\search_api\Item\ItemInterface;
+use Drupal\search_api\Plugin\PluginFormTrait;
+use Drupal\search_api\Processor\ProcessorPluginBase;
+use Drupal\search_api\Processor\ProcessorProperty;
+use Drupal\controlled_access_terms\EDTFUtils;
+
+/**
+ * Adds the item's creation year to the indexed data.
+ *
+ * @SearchApiProcessor(
+ *   id = "edtf_year_only",
+ *   label = @Translation("EDTF Year"),
+ *   description = @Translation("Adds the item's EDTF date as a year."),
+ *   stages = {
+ *     "add_properties" = 0,
+ *   },
+ * )
+ */
+class EDTFYear extends ProcessorPluginBase implements PluginFormInterface {
+
+  use PluginFormTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getPropertyDefinitions(DatasourceInterface $datasource = NULL) {
+    $properties = [];
+
+    if (!$datasource) {
+      $definition = [
+        'label' => $this->t('EDTF Creation Date Year'),
+        'description' => $this->t('The year the item was created'),
+        'type' => 'integer',
+        'is_list' => TRUE,
+        'processor_id' => $this->getPluginId(),
+      ];
+      $properties['edtf_year'] = new ProcessorProperty($definition);
+    }
+
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'fields' => [],
+      'open_start_year' => 0,
+      'open_end_year' => '',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $formState) {
+    $form['#description'] = $this->t('Select the fields containing EDTF strings to extract year values for.');
+    $fields = \Drupal::entityTypeManager()->getStorage('field_config')->loadByProperties(['field_type' => 'edtf']);
+    $fields_options = [];
+    foreach ($fields as $field) {
+      $fields_options[$field->getTargetBundle() . '|' . $field->get('field_name')] = $this->t("%label (%bundle)", [
+        '%label' => $field->label(),
+        '%bundle' => $field->getTargetBundle(),
+      ]);
+    }
+    $form['fields'] = [
+      '#type' => 'select',
+      '#multiple' => TRUE,
+      '#title' => $this->t('Fields'),
+      '#description' => $this->t('Select the fields with EDTF values to use.'),
+      '#options' => $fields_options,
+      '#default_value' => $this->configuration['fields'],
+    ];
+
+    $form['open_start_year'] = [
+      '#type' => 'number',
+      '#title' => $this->t('Open Interval Begin Year'),
+      '#description' => $this->t('Sets the beginning year to be used when processing an date interval. For example, by default, "../%year" would become every year from 0 until %year', ['%year' => date("Y")]),
+      '#default_value' => $this->configuration['open_start_year'],
+    ];
+    $form['open_end_year'] = [
+      '#type' => 'number',
+      '#title' => $this->t('Open Interval End Year'),
+      '#description' => $this->t('Sets the last year to be used when processing an date interval. Leave blank to use the current year when last indexed. For example, by default, "2020/.." would become every year from 2020 until this year (%year).', ['%year' => date("Y")]),
+      '#default_value' => $this->configuration['open_end_year'],
+    ];
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateConfigurationForm(array &$form, FormStateInterface $formState) {
+    if (!is_numeric($formState->getValue('open_start_year'))) {
+      $formState->setError($form['open_start_year'], $this->t('Please provide an integer year value.'));
+    }
+    if (!empty($formState->getValue('open_end_year')) && !is_numeric($formState->getValue('open_end_year'))) {
+      $formState->setError($form['open_end_year'], $this->t('Please leave the field blank or provide an integer year value.'));
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function addFieldValues(ItemInterface $item) {
+
+    $entity = $item->getOriginalObject()->getValue();
+
+    foreach ($this->configuration['fields'] as $field) {
+      list($bundle, $field_name) = explode('|', $field, 2);
+      if ($entity
+          && $entity->bundle() == $bundle
+        && $entity->hasField($field_name)
+        && !$entity->get($field_name)->isEmpty()) {
+        $edtf = $entity->get($field_name)->value;
+        if ($edtf != "nan" && empty(EDTFUtils::validate($edtf))) {
+          $years = [];
+          // Sets.
+          if (strpos($edtf, '[') !== FALSE || strpos($edtf, '{') !== FALSE) {
+            $years = preg_split('/(,|\.\.)/', trim($edtf, '{}[]'));
+          }
+          // Intervals.
+          elseif (strpos($edtf, '/') !== FALSE) {
+            $date_range = explode('/', $edtf);
+            if ($date_range[0] == '..') {
+              // The list of years needs to begin *somewhere*.
+              $begin = $this->configuration['open_start_year'];
+            }
+            else {
+              $begin = $this->edtfToYearInt($date_range[0]);
+            }
+            if ($date_range[1] == '..') {
+              // Similarly, we need to end somewhere.
+              // Use this year if none was configured.
+              $end = (empty($this->configuration['open_end_year'])) ? intval(date("Y")) : $this->configuration['open_end_year'];
+            }
+            else {
+              $end = $this->edtfToYearInt($date_range[1]);
+            }
+            $years = range($begin, $end);
+          }
+          else {
+            $years[] = $this->edtfToYearInt($edtf);
+          }
+          foreach ($years as $year) {
+            if (is_numeric($year)) {
+              $fields = $item->getFields(FALSE);
+              $fields = $this->getFieldsHelper()
+                ->filterForPropertyPath($fields, NULL, 'edtf_year');
+              foreach ($fields as $field) {
+                $field->addValue($year);
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  /**
+   * Convert a given EDTF date string into a year integer.
+   */
+  private function edtfToYearInt(string $edtf) {
+    $iso = EDTFUtils::iso8601Value($edtf);
+    $components = explode('-', $iso);
+    return intval(array_shift($components));
+  }
+
+}