Add initial code for multiple sources handling #81

src/Element/Pattern.php

@@ -84,7 +84,19 @@ class Pattern extends RenderElement {
       $fields = $element['#fields'];
       unset($element['#fields']);
       foreach ($fields as $name => $field) {
-        $element["#{$name}"] = $field;
+        $key = '#' . $name;
+
+        // This guarantees backward compatibility: single sources be single.
+        if (count($field) == 1) {
+          $element[$key] = reset($field);
+        }
+        else {
+          // Render multiple sources with "patterns_destination" template.
+          $element[$key]['#sources'] = $field;
+          $element[$key]['#context']['pattern'] = $element['#id'];
+          $element[$key]['#context']['field'] = $name;
+          $element[$key]['#theme'] = 'patterns_destination';
+        }
       }
     }
     else {

templates/patterns-destination.html.twig

+{#
+/**
+ * @file
+ * Render destination in case of multiple sources mapped to it.
+ */
+#}
+{% if sources is not empty %}
+  {% for source in sources %}
+    {{ source }}
+  {% endfor %}
+{% endif %}
+
+
+

tests/src/Unit/AbstractUiPatternsTest.php

@@ -135,4 +135,14 @@ abstract class AbstractUiPatternsTest extends UnitTestCase {
     return $loader;
   }
 
+  /**
+   * Get fixtures base path.
+   *
+   * @return string
+   *    Fixtures base path.
+   */
+  protected function getFixturePath() {
+    return realpath(dirname(__FILE__) . '/../fixtures');
+  }
+
 }

tests/src/Unit/PatternPreviewTest.php → tests/src/Unit/Element/PatternPreviewTest.php

 <?php
 
-namespace Drupal\Tests\ui_patterns\Unit;
+namespace Drupal\Tests\ui_patterns\Unit\Element;
 
 use function bovigo\assert\assert;
 use function bovigo\assert\predicate\equals;
 use Drupal\Component\Serialization\Yaml;
+use Drupal\Tests\ui_patterns\Unit\AbstractUiPatternsTest;
 use Drupal\ui_patterns\Element\PatternPreview;
 
 /**
@@ -20,7 +21,7 @@ class PatternPreviewTest extends AbstractUiPatternsTest {
    * @covers ::getPreviewMarkup
    */
   public function testPreviewMarkup() {
-    $assertions = Yaml::decode(file_get_contents(dirname(__FILE__) . '/../fixtures/preview_markup.yml'));
+    $assertions = Yaml::decode(file_get_contents($this->getFixturePath() . '/preview_markup.yml'));
     foreach ($assertions as $assertion) {
       $result = PatternPreview::getPreviewMarkup($assertion['actual']);
       assert($assertion['expected'], equals($result));

tests/src/Unit/Element/PatternTest.php

+<?php
+
+namespace Drupal\Tests\ui_patterns\Unit\Element;
+
+use function bovigo\assert\assert;
+use function bovigo\assert\predicate\equals;
+use Drupal\Component\Serialization\Yaml;
+use Drupal\Tests\ui_patterns\Unit\AbstractUiPatternsTest;
+use Drupal\ui_patterns\Element\Pattern;
+
+/**
+ * @coversDefaultClass \Drupal\ui_patterns\Element\Pattern
+ *
+ * @group ui_patterns
+ */
+class PatternTest extends AbstractUiPatternsTest {
+
+  /**
+   * Test getPreviewMarkup.
+   *
+   * @covers ::processFields
+   *
+   * @dataProvider fieldsProvider
+   */
+  public function testProcessFields($actual, $expected) {
+    $result = Pattern::processFields($actual);
+    assert($result, equals($expected));
+  }
+
+  /**
+   * Data provider.
+   */
+  public function fieldsProvider() {
+    return Yaml::decode(file_get_contents($this->getFixturePath() . '/pattern_element_fields.yml'));
+  }
+
+}

tests/src/fixtures/pattern_element_fields.yml

+-
+  actual:
+    '#fields':
+      pattern_field:
+        source:
+          '#markup': 'My markup.'
+  expected:
+    '#pattern_field':
+      '#markup': 'My markup.'
+-
+  actual:
+    '#id': pattern_id
+    '#fields':
+      pattern_field:
+        source1:
+          '#markup': 'My markup 1.'
+        source2:
+          '#markup': 'My markup 2.'
+  expected:
+    '#id': pattern_id
+    '#pattern_field':
+      '#sources':
+        source1:
+          '#markup': 'My markup 1.'
+        source2:
+          '#markup': 'My markup 2.'
+      '#context':
+          pattern: pattern_id
+          field: pattern_field
+      '#theme': patterns_destination

ui_patterns.module

@@ -21,6 +21,9 @@ function ui_patterns_theme() {
     'patterns_meta_information' => [
       'variables' => ['pattern' => NULL],
     ],
+    'patterns_destination' => [
+      'variables' => ['sources' => NULL, 'context' => []],
+    ],
   ] + UiPatterns::getManager()->hookTheme();
 }
 
@@ -33,6 +36,16 @@ function ui_patterns_theme_suggestions_alter(array &$suggestions, array $variabl
   }
 }
 
+/**
+ * Implements hook_theme_suggestions_HOOK()
+ */
+function ui_patterns_theme_suggestions_patterns_destination(array $variables) {
+  $suggestions = [];
+  $suggestions[] = 'patterns_destination__' . $variables['context']['pattern'];
+  $suggestions[] = 'patterns_destination__' . $variables['context']['pattern'] . '__' . $variables['context']['field'];
+  return $suggestions;
+}
+
 /**
  * Implements hook_library_info_build()
  */