Allow support for PHP Attributes with new context

README.md

@@ -19,6 +19,17 @@ Allows to reference and print a custom block plugin. You only need to put `allow
  */
 ~~~~
 
+Version 4 supports PHP Attributes:
+~~~~
+#[Block(
+  id: "category_products_block",
+  admin_label: new TranslatableMarkup("Category products"),
+  context_definitions: [
+    'allow_as_block_plugin_field_context' => new ContextDefinition('boolean'),
+  ]
+)]
+~~~~
+
 ### Mr. Milú Color:
 Provides a field type to store a color in hexadecimal format.
 

mrmilu_fields.info.yml

@@ -2,5 +2,5 @@ name: Mr. Milú Fields
 description: Provides some custom fields
 package: Mr. Milú
 type: module
-core_version_requirement: ^8.8.0 || ^9 || ^10
-version: 3.0.0
+core_version_requirement: ^10 || ^11
+version: 4.0.0

mrmilu_fields.services.yml

@@ -0,0 +1,5 @@
+services:
+  mrmilu_fields.allow_as_plugin_field_context:
+    class: Drupal\mrmilu_fields\ContextProvider\AllowAsBlockPluginFieldContext
+    tags:
+      - { name: 'context_provider' }

src/ContextProvider/AllowAsBlockPluginFieldContext.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\mrmilu_fields\ContextProvider;
+
+use Drupal\Core\Plugin\Context\Context;
+use Drupal\Core\Plugin\Context\ContextDefinition;
+use Drupal\Core\Plugin\Context\ContextProviderInterface;
+
+/**
+ * Defines a class to allow block plugin be referenced in field.
+ */
+class AllowAsBlockPluginFieldContext implements ContextProviderInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRuntimeContexts(array $unqualified_context_ids): array {
+    return [
+      'allow_as_block_plugin_field_context' => new Context(new ContextDefinition('boolean'), TRUE),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getAvailableContexts(): array {
+    return $this->getRuntimeContexts([]);
+  }
+
+}

src/Plugin/Field/FieldWidget/MrMiluBlockPluginWidget.php

@@ -103,8 +103,14 @@ public function getOptions() {
     $options = ['_none' => t('- None -')];
     $definitions = $this->blockManager->getDefinitionsForContexts($this->contextRepository->getAvailableContexts());
     foreach ($definitions as $id => $definition) {
+      // Default support for Annotations.
       if (!empty($definition['allow_as_block_plugin_field'])) {
         $options[$id] = $definition['admin_label'];
+        continue;
+      }
+      // Support for PHP Attributes.
+      if (isset($definition['context_definitions']['allow_as_block_plugin_field_context'])) {
+        $options[$id] = $definition['admin_label'];
       }
     }
     return $options;