added simple math and charts modules

web/modules/charts/src/PluginsUninstallValidator.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Drupal\charts;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Extension\ModuleUninstallValidatorInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Prevents uninstalling of a module providing default chart library plugin.
+ */
+class PluginsUninstallValidator implements ModuleUninstallValidatorInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * Constructs a new ChartsPluginsUninstallValidator.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory) {
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validate($module) {
+    $reasons = [];
+    $config = $this->configFactory->get('charts.settings');
+    $dependent_modules = $config->get('dependencies.module') ?? [];
+    if (in_array($module, $dependent_modules)) {
+      $reasons[] = $this->t('Provides a chart library or chart type plugin configured as the default option for chart. Please update <a href="/admin/config/content/charts?destination=/admin/modules/uninstall">the configuration</a> or reset them before uninstalling it.');
+    }
+    return $reasons;
+  }
+
+}