code-block-9.5.patch

diff --git a/core/modules/ckeditor5/ckeditor5.ckeditor5.yml b/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
index 4396b64ed4..0372fddc89 100644
--- a/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
+++ b/core/modules/ckeditor5/ckeditor5.ckeditor5.yml
@@ -263,6 +263,7 @@ ckeditor5_codeBlock:
     label: Code Block
     library: ckeditor5/internal.drupal.ckeditor5.codeBlock
     admin_library: ckeditor5/internal.admin.codeBlock
+    class: Drupal\ckeditor5\Plugin\CKEditor5Plugin\CodeBlock
     toolbar_items:
       codeBlock:
         label: Code Block
diff --git a/core/modules/ckeditor5/ckeditor5.post_update.php b/core/modules/ckeditor5/ckeditor5.post_update.php
index 1e56e029c1..e7d18c19fc 100644
--- a/core/modules/ckeditor5/ckeditor5.post_update.php
+++ b/core/modules/ckeditor5/ckeditor5.post_update.php
@@ -100,3 +100,19 @@ function ckeditor5_post_update_image_toolbar_item(&$sandbox = []) {
 
   $config_entity_updater->update($sandbox, 'editor', $callback);
 }
+
+/**
+ * Updates Text Editors using CKEditor 5 Code Block.
+ */
+function ckeditor5_post_update_code_block(&$sandbox = []) {
+  $config_entity_updater = \Drupal::classResolver(ConfigEntityUpdater::class);
+  $config_entity_updater->update($sandbox, 'editor', function (Editor $editor): bool {
+    // Only try to update editors using CKEditor 5.
+    if ($editor->getEditor() !== 'ckeditor5') {
+      return FALSE;
+    }
+    $settings = $editor->getSettings();
+
+    return in_array('codeBlock', $settings['toolbar']['items'], TRUE);
+  });
+}
diff --git a/core/modules/ckeditor5/config/schema/ckeditor5.schema.yml b/core/modules/ckeditor5/config/schema/ckeditor5.schema.yml
index b7b2bc3b20..7c1d527ae6 100644
--- a/core/modules/ckeditor5/config/schema/ckeditor5.schema.yml
+++ b/core/modules/ckeditor5/config/schema/ckeditor5.schema.yml
@@ -136,6 +136,31 @@ ckeditor5.plugin.media_media:
       constraints:
         NotNull: []
 
+# Plugin \Drupal\ckeditor5\Plugin\CKEditor5Plugin\CodeBlock
+ckeditor5.plugin.ckeditor5_codeBlock:
+  type: mapping
+  label: Code Block
+  mapping:
+    languages:
+      type: sequence
+      orderby: ~
+      label: 'Languages'
+      constraints:
+        NotBlank:
+          message: "Enable at least one language, otherwise disable the Code Block plugin."
+        UniqueLabelInList:
+          labelKey: label
+      sequence:
+        type: mapping
+        label: 'Language'
+        mapping:
+          label:
+            type: label
+            label: 'Language label'
+          language:
+            type: string
+            label: 'Language key'
+
 # Plugin \Drupal\ckeditor5\Plugin\CKEditor5Plugin\Style
 ckeditor5.plugin.ckeditor5_style:
   type: mapping
diff --git a/core/modules/ckeditor5/src/Plugin/CKEditor5Plugin/CodeBlock.php b/core/modules/ckeditor5/src/Plugin/CKEditor5Plugin/CodeBlock.php
new file mode 100644
index 0000000000..2f05a6f231
--- /dev/null
+++ b/core/modules/ckeditor5/src/Plugin/CKEditor5Plugin/CodeBlock.php
@@ -0,0 +1,151 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\ckeditor5\Plugin\CKEditor5Plugin;
+
+use Drupal\ckeditor5\HTMLRestrictions;
+use Drupal\ckeditor5\Plugin\CKEditor5PluginConfigurableTrait;
+use Drupal\ckeditor5\Plugin\CKEditor5PluginDefault;
+use Drupal\ckeditor5\Plugin\CKEditor5PluginConfigurableInterface;
+use Drupal\ckeditor5\Plugin\CKEditor5PluginElementsSubsetInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\editor\EditorInterface;
+
+/**
+ * CKEditor 5 Code Block plugin configuration.
+ *
+ * @internal
+ *   Plugin classes are internal.
+ */
+class CodeBlock extends CKEditor5PluginDefault implements CKEditor5PluginConfigurableInterface, CKEditor5PluginElementsSubsetInterface {
+
+  use CKEditor5PluginConfigurableTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $form['languages'] = [
+      '#title' => $this->t('Code Block Languages'),
+      '#type' => 'textarea',
+      '#description' => $this->t('A list of code block languages that will be provided in the "Code Block" dropdown. Enter one value per line, in the format key|label. Example: php|PHP'),
+    ];
+    if (!empty($this->configuration['languages'])) {
+      $as_selectors = '';
+      foreach ($this->configuration['languages'] as $language) {
+        $as_selectors .= sprintf("%s|%s\n", $language['language'], $language['label']);
+      }
+      $form['languages']['#default_value'] = $as_selectors;
+    }
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $form_value = $form_state->getValue('languages');
+    [$styles, $unparseable_lines] = self::parseLanguagesFromValue($form_value);
+    if (!empty($unparseable_lines)) {
+      $line_numbers = array_keys($unparseable_lines);
+      $form_state->setError($form['languages'], $this->formatPlural(
+        count($unparseable_lines),
+        'Line @line-number does not contain a valid value. Enter a valid language key followed by a pipe symbol and a label.',
+        'Lines @line-numbers do not contain a valid value. Enter a valid language key followed by a pipe symbol and a label.',
+        [
+          '@line-number' => reset($line_numbers),
+          '@line-numbers' => implode(', ', $line_numbers),
+        ]
+      ));
+    }
+    $form_state->setValue('languages', $styles);
+  }
+
+  /**
+   * Parses the line-based (for form) Code Block configuration.
+   *
+   * @param string $form_value
+   *   A string containing >=1 lines with on each line a language key and label.
+   *
+   * @return array
+   *   The parsed equivalent: a list of arrays with each containing:
+   *   - label: the label after the pipe symbol, with whitespace trimmed
+   *   - language: the key for the language
+   *
+   * @internal
+   *   This method is public only to allow the CKEditor 4 to 5 upgrade path to
+   *   reuse this logic. Mark this private in https://www.drupal.org/i/3239012.
+   */
+  public static function parseLanguagesFromValue(string $form_value): array {
+    $unparseable_lines = [];
+
+    $lines = explode("\n", $form_value);
+    $languages = [];
+    foreach ($lines as $index => $line) {
+      if (empty(trim($line))) {
+        continue;
+      }
+
+      // Parse the line.
+      [$language, $label] = array_map('trim', explode('|', $line));
+
+      $languages[] = [
+        'label' => $label,
+        'language' => $language,
+      ];
+    }
+    return [$languages, $unparseable_lines];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
+    $this->configuration['languages'] = $form_state->getValue('languages');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function defaultConfiguration() {
+    return [
+      'languages' => [
+        [ 'language' => 'plaintext', 'label' => 'Plain text' ],
+        [ 'language' => 'c', 'label' => 'C' ],
+        [ 'language' => 'cs', 'label' => 'C#' ],
+        [ 'language' => 'cpp', 'label' => 'C++' ],
+        [ 'language' => 'css', 'label' => 'CSS' ],
+        [ 'language' => 'diff', 'label' => 'Diff' ],
+        [ 'language' => 'html', 'label' => 'HTML' ],
+        [ 'language' => 'java', 'label' => 'Java' ],
+        [ 'language' => 'javascript', 'label' => 'JavaScript' ],
+        [ 'language' => 'php', 'label' => 'PHP' ],
+        [ 'language' => 'python', 'label' => 'Python' ],
+        [ 'language' => 'ruby', 'label' => 'Ruby' ],
+        [ 'language' => 'typescript', 'label' => 'TypeScript' ],
+        [ 'language' => 'xml', 'label' => 'XML' ],
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getElementsSubset(): array {
+    return array_column($this->configuration['languages'], 'language');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDynamicPluginConfig(array $static_plugin_config, EditorInterface $editor): array {
+    return [
+      'codeBlock' => [
+        'languages' => $this->configuration['languages'],
+      ],
+    ];
+  }
+
+}