Issue #3446939 by Marcus_Johansson: Add base class for text to JSON field

src/PluginBaseClasses/TextToJsonField.php

+<?php
+
+namespace Drupal\ai_interpolator\PluginBaseClasses;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Field\FieldDefinitionInterface;
+
+/**
+ * This is a base class that can be used for LLMs json output.
+ */
+class ComplexTextChat extends SimpleTextChat {
+
+  /**
+   * {@inheritDoc}
+   */
+  public function helpText() {
+    return "This is a simple text to JSON field model.";
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public function generate(ContentEntityInterface $entity, FieldDefinitionInterface $fieldDefinition, array $interpolatorConfig) {
+    // Generate the real prompt if needed.
+    $prompts = [];
+    // @phpstan-ignore-next-line
+    if (!empty($interpolatorConfig['mode']) && $interpolatorConfig['mode'] == 'token' && \Drupal::service('module_handler')->moduleExists('token')) {
+      $prompts[] = \Drupal::service('ai_interpolator.prompt_helper')->renderTokenPrompt($interpolatorConfig['token'], $entity); /* @phpstan-ignore-line */
+    } elseif ($this->needsPrompt()) {
+      // Run rule.
+      foreach ($entity->get($interpolatorConfig['base_field'])->getValue() as $i => $item) {
+        // Get tokens.
+        $tokens = $this->generateTokens($entity, $fieldDefinition, $interpolatorConfig, $i);
+        $prompts[] = \Drupal::service('ai_interpolator.prompt_helper')->renderPrompt($interpolatorConfig['prompt'], $tokens, $i); /* @phpstan-ignore-line */
+      }
+    }
+
+    // Add JSON output.
+    foreach ($prompts as $key => $prompt) {
+      $prompts[$key] = $prompt;
+    }
+    $total = [];
+    foreach ($prompts as $prompt) {
+      $values = $this->generateResponse($prompt, $interpolatorConfig, $entity, $fieldDefinition);
+      if (!empty($values)) {
+        $total[] = $values;
+      }
+    }
+    return $total;
+  }
+
+  /**
+   * {@inheritDoc}
+   */
+  public function verifyValue(ContentEntityInterface $entity, $value, FieldDefinitionInterface $fieldDefinition) {
+    // Check so its valid JSON.
+    if (empty($value)) {
+      return FALSE;
+    }
+    $json = json_decode($value, TRUE);
+    if (empty($json)) {
+      return FALSE;
+    }
+    return TRUE;
+  }
+}