Issue #2150257 by chx, mpgeek: Add a machine name process plugin.

core/modules/migrate/lib/Drupal/migrate/Plugin/migrate/process/MachineName.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate\Plugin\migrate\process\MachineName.
+ */
+
+namespace Drupal\migrate\Plugin\migrate\process;
+
+use Drupal\Core\Language\Language;
+use Drupal\Core\Plugin\PluginBase;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\Plugin\MigrateProcessInterface;
+use Drupal\migrate\Row;
+
+/**
+ * This plugin creates a machine name.
+ *
+ * The current value gets transliterated, non-alphanumeric characters removed
+ * and replaced by an underscore and multiple underscores are collapsed into
+ * one.
+ *
+ * @PluginId("machine_name")
+ */
+class MachineName extends PluginBase implements MigrateProcessInterface {
+
+  /**
+   * @var \Drupal\Core\Transliteration\PHPTransliteration
+   */
+  protected $transliteration;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutable $migrate_executable, Row $row, $destination_property) {
+    $new_value = $this->getTransliteration()->transliterate($value, Language::LANGCODE_DEFAULT, '_');
+    $new_value = strtolower($new_value);
+    $new_value = preg_replace('/[^a-z0-9_]+/', '_', $new_value);
+    return preg_replace('/_+/', '_', $new_value);
+  }
+
+  /**
+   * @return \Drupal\Core\Transliteration\PHPTransliteration
+   */
+  protected function getTransliteration() {
+    if (!isset($this->transliteration)) {
+      $this->transliteration = \Drupal::transliteration();
+    }
+    return $this->transliteration;
+  }
+
+}
+

core/modules/migrate/tests/Drupal/migrate/Tests/process/MachineNameTest.php

+<?php
+/**
+ * @file
+ * Contains \Drupal\migrate\Tests\process\MachineNameTest.
+ */
+
+namespace Drupal\migrate\Tests\process;
+
+use Drupal\migrate\Plugin\migrate\process\TestMachineName;
+
+/**
+ * Tests the machine name process plugin.
+ *
+ * @group migrate
+ * @group Drupal
+ */
+class MachineNameTest extends MigrateProcessTestCase {
+
+  /**
+   * The mock transliteration.
+   *
+   * @var \Drupal\Component\Transliteration\TransliterationInterface
+   */
+  protected $transliteration;
+
+  /**
+   * @var bool
+   */
+  protected $mapJoinable = FALSE;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getInfo() {
+    return array(
+      'name' => 'Machine mame process plugin',
+      'description' => 'Tests the machine name process plugin.',
+      'group' => 'Migrate',
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    $this->transliteration = $this->getMockBuilder('Drupal\Component\Transliteration\TransliterationInterface')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->row = $this->getMockBuilder('Drupal\migrate\Row')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->migrateExecutable = $this->getMockBuilder('Drupal\migrate\MigrateExecutable')
+      ->disableOriginalConstructor()
+      ->getMock();
+    parent::setUp();
+  }
+
+  /**
+   * Tests machine name transformation of non-alphanumeric characters.
+   */
+  public function testMachineNames() {
+
+    // Tests the following transformations:
+    // - non-alphanumeric character (including spaces) -> underscore,
+    // - Uppercase -> lowercase,
+    // - Multiple consecutive underscore -> single underscore.
+    $human_name_ascii = 'foo2, the.bar;2*&the%baz!YEE____HaW ';
+    $human_name = $human_name_ascii .'áéő';
+    $expected_result = 'foo2_the_bar_2_the_baz_yee_haw_aeo';
+    // Test for calling transliterate on mock object.
+    $this->transliteration
+      ->expects($this->once())
+      ->method('transliterate')
+      ->with($human_name)
+      ->will($this->returnValue($human_name_ascii . 'aeo'));
+
+    $plugin = new TestMachineName(array(), 'machine_name', array());
+    $plugin->setTransliteration($this->transliteration);
+    $value = $plugin->transform($human_name, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertEquals($expected_result, $value);
+  }
+
+}
+
+namespace Drupal\migrate\Plugin\migrate\process;
+
+use Drupal\Component\Transliteration\TransliterationInterface;
+
+class TestMachineName extends MachineName {
+  public function setTransliteration(TransliterationInterface $transliteration) {
+    $this->transliteration = $transliteration;
+  }
+}