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vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/formatter-schema.twig

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+field.formatter.settings.{{ plugin_id }}:
+  type: mapping
+  label: {{ plugin_label }} formatter settings
+  mapping:
+    foo:
+      type: string
+      label: Foo

vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/formatter.twig

@@ -0,0 +1,73 @@
+<?php
+
+namespace Drupal\{{ machine_name }}\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\FormatterBase;
+{% if configurable %}
+use Drupal\Core\Form\FormStateInterface;
+{% endif %}
+
+/**
+ * Plugin implementation of the '{{ plugin_label }}' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "{{ plugin_id }}",
+ *   label = @Translation("{{ plugin_label }}"),
+ *   field_types = {
+ *     "string"
+ *   }
+ * )
+ */
+class {{ class }} extends FormatterBase {
+
+{% if configurable %}
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return [
+      'foo' => 'bar',
+    ] + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+
+    $elements['foo'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Foo'),
+      '#default_value' => $this->getSetting('foo'),
+    ];
+
+    return $elements;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary[] = $this->t('Foo: @foo', ['@foo' => $this->getSetting('foo')]);
+    return $summary;
+  }
+
+{% endif %}
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items, $langcode) {
+    $element = [];
+
+    foreach ($items as $delta => $item) {
+      $element[$delta] = [
+        '#type' => 'item',
+        '#markup' => $item->value,
+      ];
+    }
+
+    return $element;
+  }
+
+}

vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/type-schema.twig

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+{% if configurable_storage %}
+field.storage_settings.{{ plugin_id }}:
+  type: mapping
+  label: {{ plugin_label }} storage settings
+  mapping:
+    foo:
+      type: string
+      label: Foo
+
+{% endif %}
+{% if configurable_instance %}
+field.field_settings.{{ plugin_id }}:
+  type: mapping
+  label: {{ plugin_label }} field settings
+  mapping:
+    bar:
+      type: string
+      label: Bar
+
+{% endif %}
+field.value.{{ plugin_id }}:
+  type: mapping
+  label: Default value
+  mapping:
+    value:
+      type: label
+      label: Value

vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/type.twig

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+<?php
+
+namespace Drupal\{{ machine_name }}\Plugin\Field\FieldType;
+
+use Drupal\Component\Utility\Random;
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemBase;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+{% if configurable_storage or configurable_instance %}
+use Drupal\Core\Form\FormStateInterface;
+{% endif %}
+use Drupal\Core\TypedData\DataDefinition;
+
+/**
+ * Defines the '{{ plugin_id }}' field type.
+ *
+ * @FieldType(
+ *   id = "{{ plugin_id }}",
+ *   label = @Translation("{{ plugin_label }}"),
+ *   category = @Translation("General"),
+ *   default_widget = "string_textfield",
+ *   default_formatter = "string"
+ * )
+ *
+ * @DCG
+ * If you are implementing a single value field type you may want to inherit
+ * this class form some of the field type classes provided by Drupal core.
+ * Check out /core/lib/Drupal/Core/Field/Plugin/Field/FieldType directory for a
+ * list of available field type implementations.
+ */
+class {{ class }} extends FieldItemBase {
+
+{% if configurable_storage %}
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultStorageSettings() {
+    $settings = ['foo' => 'wine'];
+    return $settings + parent::defaultStorageSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function storageSettingsForm(array &$form, FormStateInterface $form_state, $has_data) {
+
+    $element['foo'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Foo'),
+      '#default_value' => $this->getSetting('foo'),
+      '#disabled' => $has_data,
+    ];
+
+    return $element;
+  }
+
+{% endif %}
+{% if configurable_instance %}
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultFieldSettings() {
+    $settings = ['bar' => 'beer'];
+    return $settings + parent::defaultFieldSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
+
+    $element['bar'] = [
+      '#type' => 'textfield',
+      '#title' => t('Bar'),
+      '#default_value' => $this->getSetting('bar'),
+    ];
+
+    return $element;
+  }
+
+{% endif %}
+  /**
+   * {@inheritdoc}
+   */
+  public function isEmpty() {
+    $value = $this->get('value')->getValue();
+    return $value === NULL || $value === '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+
+    // @DCG
+    // See /core/lib/Drupal/Core/TypedData/Plugin/DataType directory for
+    // available data types.
+    $properties['value'] = DataDefinition::create('string')
+      ->setLabel(t('Text value'))
+      ->setRequired(TRUE);
+
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConstraints() {
+    $constraints = parent::getConstraints();
+
+    $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
+
+    // @DCG Suppose our value must not be longer than 10 characters.
+    $options['value']['Length']['max'] = 10;
+
+    // @DCG
+    // See /core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint
+    // directory for available constraints.
+    $constraints[] = $constraint_manager->create('ComplexData', $options);
+    return $constraints;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function schema(FieldStorageDefinitionInterface $field_definition) {
+
+    $columns = [
+      'value' => [
+        'type' => 'varchar',
+        'not null' => FALSE,
+        'description' => 'Column description.',
+        'length' => 255,
+      ],
+    ];
+
+    $schema = [
+      'columns' => $columns,
+      // @DCG Add indexes here if necessary.
+    ];
+
+    return $schema;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
+    $random = new Random();
+    $values['value'] = $random->word(mt_rand(1, 50));
+    return $values;
+  }
+
+}

vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/widget-schema.twig

@@ -0,0 +1,7 @@
+field.widget.settings.{{ plugin_id }}:
+  type: mapping
+  label: {{ plugin_label }} widget settings
+  mapping:
+    foo:
+      type: string
+      label: Foo

vendor/chi-teck/drupal-code-generator/templates/d8/plugin/field/widget.twig

@@ -0,0 +1,66 @@
+<?php
+
+namespace Drupal\{{ machine_name }}\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Defines the '{{ plugin_id }}' field widget.
+ *
+ * @FieldWidget(
+ *   id = "{{ plugin_id }}",
+ *   label = @Translation("{{ plugin_label }}"),
+ *   field_types = {"string"},
+ * )
+ */
+class {{ class }} extends WidgetBase {
+
+{% if configurable %}
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return [
+      'foo' => 'bar',
+    ] + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+
+    $element['foo'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Foo'),
+      '#default_value' => $this->getSetting('foo'),
+    ];
+
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary[] = $this->t('Foo: @foo', ['@foo' => $this->getSetting('foo')]);
+    return $summary;
+  }
+
+{% endif %}
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+
+    $element['value'] = $element + [
+      '#type' => 'textfield',
+      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
+    ];
+
+    return $element;
+  }
+
+}