Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/lib/Drupal/Component/Serialization/Exception/InvalidDataTypeException.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Serialization\Exception\InvalidDataTypeException.
+ */
+
+namespace Drupal\Component\Serialization\Exception;
+
+/**
+ * Exception thrown when a data type is invalid.
+ */
+class InvalidDataTypeException extends \InvalidArgumentException {
+}

core/lib/Drupal/Component/Serialization/Json.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Serialization\Json.
+ */
+
+namespace Drupal\Component\Serialization;
+
+/**
+ * Default serialization for JSON.
+ *
+ * @ingroup third_party
+ */
+class Json implements SerializationInterface {
+
+  /**
+   * {@inheritdoc}
+   *
+   * Uses HTML-safe strings, with several characters escaped.
+   */
+  public static function encode($variable) {
+    // Encode <, >, ', &, and ".
+    return json_encode($variable, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function decode($string) {
+    return json_decode($string, TRUE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getFileExtension() {
+    return 'json';
+  }
+
+}

core/lib/Drupal/Component/Serialization/PhpSerialize.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Serialization\PhpSerialize.
+ */
+
+namespace Drupal\Component\Serialization;
+
+/**
+ * Default serialization for serialized PHP.
+ */
+class PhpSerialize implements SerializationInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function encode($data) {
+    return serialize($data);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function decode($raw) {
+    return unserialize($raw);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getFileExtension() {
+    return 'serialized';
+  }
+
+}

core/lib/Drupal/Component/Serialization/SerializationInterface.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Serialization\SerializationInterface.
+ */
+
+namespace Drupal\Component\Serialization;
+
+/**
+ * Defines an interface for serialization formats.
+ */
+interface SerializationInterface {
+
+  /**
+   * Encodes data into the serialization format.
+   *
+   * @param mixed $data
+   *   The data to encode.
+   *
+   * @return string
+   *   The encoded data.
+   */
+  public static function encode($data);
+
+  /**
+   * Decodes data from the serialization format.
+   *
+   * @param string $raw
+   *   The raw data string to decode.
+   *
+   * @return mixed
+   *   The decoded data.
+   */
+  public static function decode($raw);
+
+  /**
+   * Gets the file extension for this serialization format.
+   *
+   * @return string
+   *   The file extension, without leading dot.
+   */
+  public static function getFileExtension();
+
+}

core/lib/Drupal/Component/Serialization/Yaml.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Component\Serialization\Yaml.
+ */
+
+namespace Drupal\Component\Serialization;
+
+use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
+use Symfony\Component\Yaml\Parser;
+use Symfony\Component\Yaml\Dumper;
+
+/**
+ * Default serialization for YAML using the Symfony component.
+ */
+class Yaml implements SerializationInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function encode($data) {
+    try {
+      $yaml = new Dumper();
+      $yaml->setIndentation(2);
+      return $yaml->dump($data, PHP_INT_MAX, 0, TRUE, FALSE);
+    }
+    catch (\Exception $e) {
+      throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function decode($raw) {
+    try {
+      $yaml = new Parser();
+      // Make sure we have a single trailing newline. A very simple config like
+      // 'foo: bar' with no newline will fail to parse otherwise.
+      return $yaml->parse($raw, TRUE, FALSE);
+    }
+    catch (\Exception $e) {
+      throw new InvalidDataTypeException($e->getMessage(), $e->getCode(), $e);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getFileExtension() {
+    return 'yml';
+  }
+
+}