Issue #1810472 by linclark, mradcliffe: add Symfony's Serializer component to...

Issue #1810472 by linclark, mradcliffe: add Symfony's Serializer component to core despite Symfony potentially releasing BC-breaking updates after 2.3.

core/composer.json

@@ -9,6 +9,7 @@
     "symfony/http-foundation": "2.1.*",
     "symfony/http-kernel": "2.1.*",
     "symfony/routing": "2.1.*",
+    "symfony/serializer": "2.1.*",
     "symfony/yaml": "2.1.*",
     "twig/twig": "1.8.*",
     "doctrine/common": "2.3.*",

core/composer.lock

@@ -33,6 +33,10 @@
             "package": "symfony/routing",
             "version": "v2.1.0-RC2"
         },
+        {
+            "package": "symfony/serializer",
+            "version": "v2.1.2"
+        },
         {
             "package": "symfony/yaml",
             "version": "v2.1.0-RC2"

core/vendor/composer/autoload_namespaces.php

@@ -8,6 +8,7 @@
 return array(
     'Twig_' => $vendorDir . '/twig/twig/lib/',
     'Symfony\\Component\\Yaml' => $vendorDir . '/symfony/yaml/',
+    'Symfony\\Component\\Serializer' => $vendorDir . '/symfony/serializer/',
     'Symfony\\Component\\Routing' => $vendorDir . '/symfony/routing/',
     'Symfony\\Component\\Process' => $vendorDir . '/symfony/process/',
     'Symfony\\Component\\HttpKernel' => $vendorDir . '/symfony/http-kernel/',

core/vendor/symfony/serializer/Symfony/Component/Serializer/CHANGELOG.md

+CHANGELOG
+=========
+
+2.1.0
+-----
+
+ * added DecoderInterface::supportsDecoding(),
+   EncoderInterface::supportsEncoding()
+ * removed NormalizableInterface::denormalize(),
+   NormalizerInterface::denormalize(),
+   NormalizerInterface::supportsDenormalization()
+ * removed normalize() denormalize() encode() decode() supportsSerialization()
+   supportsDeserialization() supportsEncoding() supportsDecoding()
+   getEncoder() from SerializerInterface
+ * Serializer now implements NormalizerInterface, DenormalizerInterface,
+   EncoderInterface, DecoderInterface in addition to SerializerInterface
+ * added DenormalizableInterface and DenormalizerInterface
+ * [BC BREAK] changed `GetSetMethodNormalizer`'s key names from all lowercased
+   to camelCased (e.g. `mypropertyvalue` to `myPropertyValue`)
+ * [BC BREAK] convert the `item` XML tag to an array
+
+    ``` xml
+    <?xml version="1.0"?>
+    <response>
+        <item><title><![CDATA[title1]]></title></item><item><title><![CDATA[title2]]></title></item>
+    </response>
+    ```
+
+    Before:
+
+        Array()
+
+    After:
+
+        Array(
+            [item] => Array(
+                [0] => Array(
+                    [title] => title1
+                )
+                [1] => Array(
+                    [title] => title2
+                )
+            )
+        )

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/ChainDecoder.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+use Symfony\Component\Serializer\Encoder\DecoderInterface;
+use Symfony\Component\Serializer\Exception\RuntimeException;
+
+/**
+ * Decoder delegating the decoding to a chain of decoders.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ * @author Lukas Kahwe Smith <smith@pooteeweet.org>
+ */
+class ChainDecoder implements DecoderInterface
+{
+    protected $decoders = array();
+    protected $decoderByFormat = array();
+
+    public function __construct(array $decoders = array())
+    {
+        $this->decoders = $decoders;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    final public function decode($data, $format)
+    {
+        return $this->getDecoder($format)->decode($data, $format);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDecoding($format)
+    {
+        try {
+            $this->getDecoder($format);
+        } catch (RuntimeException $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Gets the decoder supporting the format.
+     *
+     * @param string $format
+     *
+     * @return DecoderInterface
+     * @throws RuntimeException if no decoder is found
+     */
+    private function getDecoder($format)
+    {
+        if (isset($this->decoderByFormat[$format])
+            && isset($this->decoders[$this->decoderByFormat[$format]])
+        ) {
+            return $this->decoders[$this->decoderByFormat[$format]];
+        }
+
+        foreach ($this->decoders as $i => $decoder) {
+            if ($decoder->supportsDecoding($format)) {
+                $this->decoderByFormat[$format] = $i;
+
+                return $decoder;
+            }
+        }
+
+        throw new RuntimeException(sprintf('No decoder found for format "%s".', $format));
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/ChainEncoder.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+use Symfony\Component\Serializer\Encoder\EncoderInterface;
+use Symfony\Component\Serializer\Encoder\NormalizationAwareInterface;
+use Symfony\Component\Serializer\Exception\RuntimeException;
+
+/**
+ * Encoder delegating the decoding to a chain of encoders.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ * @author Lukas Kahwe Smith <smith@pooteeweet.org>
+ */
+class ChainEncoder implements EncoderInterface
+{
+    protected $encoders = array();
+    protected $encoderByFormat = array();
+
+    public function __construct(array $encoders = array())
+    {
+        $this->encoders = $encoders;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    final public function encode($data, $format)
+    {
+        return $this->getEncoder($format)->encode($data, $format);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsEncoding($format)
+    {
+        try {
+            $this->getEncoder($format);
+        } catch (RuntimeException $e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Checks whether the normalization is needed for the given format.
+     *
+     * @param string $format
+     *
+     * @return Boolean
+     */
+    public function needsNormalization($format)
+    {
+        $encoder = $this->getEncoder($format);
+
+        if (!$encoder instanceof NormalizationAwareInterface) {
+            return true;
+        }
+
+        if ($encoder instanceof self) {
+            return $encoder->needsNormalization($format);
+        }
+
+        return false;
+    }
+
+    /**
+     * Gets the encoder supporting the format.
+     *
+     * @param string $format
+     *
+     * @return EncoderInterface
+     * @throws RuntimeException if no encoder is found
+     */
+    private function getEncoder($format)
+    {
+        if (isset($this->encoderByFormat[$format])
+            && isset($this->encoders[$this->encoderByFormat[$format]])
+        ) {
+            return $this->encoders[$this->encoderByFormat[$format]];
+        }
+
+        foreach ($this->encoders as $i => $encoder) {
+            if ($encoder->supportsEncoding($format)) {
+                $this->encoderByFormat[$format] = $i;
+
+                return $encoder;
+            }
+        }
+
+        throw new RuntimeException(sprintf('No encoder found for format "%s".', $format));
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/DecoderInterface.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Defines the interface of decoders
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+interface DecoderInterface
+{
+    /**
+     * Decodes a string into PHP data
+     *
+     * @param scalar $data   Data to decode
+     * @param string $format Format name
+     *
+     * @return mixed
+     */
+    public function decode($data, $format);
+
+    /**
+     * Checks whether the serializer can decode from given format
+     *
+     * @param string $format format name
+     * @return Boolean
+     */
+    public function supportsDecoding($format);
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/EncoderInterface.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Defines the interface of encoders
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+interface EncoderInterface
+{
+    /**
+     * Encodes data into the given format
+     *
+     * @param mixed  $data   Data to encode
+     * @param string $format Format name
+     *
+     * @return scalar
+     */
+    public function encode($data, $format);
+
+    /**
+     * Checks whether the serializer can encode to given format
+     *
+     * @param string $format format name
+     * @return Boolean
+     */
+    public function supportsEncoding($format);
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/JsonDecode.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Decodes JSON data
+ *
+ * @author Sander Coolen <sander@jibber.nl>
+ */
+class JsonDecode implements DecoderInterface
+{
+    private $associative;
+    private $recursionDepth;
+    private $lastError = JSON_ERROR_NONE;
+
+    public function __construct($associative = false, $depth = 512)
+    {
+        $this->associative = $associative;
+        $this->recursionDepth = $depth;
+    }
+
+    /**
+     * Returns the last decoding error (if any)
+     *
+     * @return integer
+     *
+     * @see http://php.net/manual/en/function.json-last-error.php json_last_error
+     */
+    public function getLastError()
+    {
+        return $this->lastError;
+    }
+
+    /**
+     * Decodes a JSON string into PHP data
+     *
+     * @param string $data JSON
+     *
+     * @return mixed
+     */
+    public function decode($data, $format)
+    {
+        $decodedData = json_decode($data, $this->associative, $this->recursionDepth);
+        $this->lastError = json_last_error();
+
+        return $decodedData;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDecoding($format)
+    {
+        return JsonEncoder::FORMAT === $format;
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/JsonEncode.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Encodes JSON data
+ *
+ * @author Sander Coolen <sander@jibber.nl>
+ */
+class JsonEncode implements EncoderInterface
+{
+    private $options ;
+    private $lastError = JSON_ERROR_NONE;
+
+    public function __construct($bitmask = 0)
+    {
+        $this->options = $bitmask;
+    }
+
+    /**
+     * Returns the last encoding error (if any)
+     *
+     * @return integer
+     *
+     * @see http://php.net/manual/en/function.json-last-error.php json_last_error
+     */
+    public function getLastError()
+    {
+        return $this->lastError;
+    }
+
+    /**
+     * Encodes PHP data to a JSON string
+     *
+     * @param mixed $data
+     *
+     * @return string
+     */
+    public function encode($data, $format)
+    {
+        $encodedJson = json_encode($data, $this->options);
+        $this->lastError = json_last_error();
+
+        return $encodedJson;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsEncoding($format)
+    {
+        return JsonEncoder::FORMAT === $format;
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/JsonEncoder.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Encodes JSON data
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+class JsonEncoder implements EncoderInterface, DecoderInterface
+{
+    const FORMAT = 'json';
+
+    /**
+     * @var JsonEncode
+     */
+    protected $encodingImpl;
+
+    /**
+     * @var JsonDecode
+     */
+    protected $decodingImpl;
+
+    public function __construct(JsonEncode $encodingImpl = null, JsonDecode $decodingImpl = null)
+    {
+        $this->encodingImpl = null === $encodingImpl ? new JsonEncode() : $encodingImpl;
+        $this->decodingImpl = null === $decodingImpl ? new JsonDecode(true) : $decodingImpl;
+    }
+
+    /**
+     * Returns the last encoding error (if any)
+     *
+     * @return integer
+     */
+    public function getLastEncodingError()
+    {
+        return $this->encodingImpl->getLastError();
+    }
+
+    /**
+     * Returns the last decoding error (if any)
+     *
+     * @return integer
+     */
+    public function getLastDecodingError()
+    {
+        return $this->decodingImpl->getLastError();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function encode($data, $format)
+    {
+        return $this->encodingImpl->encode($data, self::FORMAT);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function decode($data, $format)
+    {
+        return $this->decodingImpl->decode($data, self::FORMAT);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsEncoding($format)
+    {
+        return self::FORMAT === $format;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsDecoding($format)
+    {
+        return self::FORMAT === $format;
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/NormalizationAwareInterface.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+/**
+ * Defines the interface of encoders that will normalize data themselves
+ *
+ * Implementing this interface essentially just tells the Serializer that the
+ * data should not be pre-normalized before being passed to this Encoder.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+interface NormalizationAwareInterface
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/SerializerAwareEncoder.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+use Symfony\Component\Serializer\SerializerInterface;
+use Symfony\Component\Serializer\SerializerAwareInterface;
+
+/**
+ * SerializerAware Encoder implementation
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
+abstract class SerializerAwareEncoder implements SerializerAwareInterface
+{
+    protected $serializer;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setSerializer(SerializerInterface $serializer)
+    {
+        $this->serializer = $serializer;
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/XmlEncoder.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Encoder;
+
+use Symfony\Component\Serializer\Exception\UnexpectedValueException;
+
+/**
+ * Encodes XML data
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ * @author John Wards <jwards@whiteoctober.co.uk>
+ * @author Fabian Vogler <fabian@equivalence.ch>
+ */
+class XmlEncoder extends SerializerAwareEncoder implements EncoderInterface, DecoderInterface, NormalizationAwareInterface
+{
+    private $dom;
+    private $format;
+    private $rootNodeName = 'response';
+
+    /**
+     * {@inheritdoc}
+     */
+    public function encode($data, $format)
+    {
+        if ($data instanceof \DOMDocument) {
+            return $data->saveXML();
+        }
+
+        $this->dom = new \DOMDocument();
+        $this->format = $format;
+
+        if (null !== $data && !is_scalar($data)) {
+            $root = $this->dom->createElement($this->rootNodeName);
+            $this->dom->appendChild($root);
+            $this->buildXml($root, $data);
+        } else {
+            $this->appendNode($this->dom, $data, $this->rootNodeName);
+        }
+
+        return $this->dom->saveXML();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function decode($data, $format)
+    {
+        $internalErrors = libxml_use_internal_errors(true);
+        $disableEntities = libxml_disable_entity_loader(true);
+        libxml_clear_errors();
+
+        $dom = new \DOMDocument();
+        $dom->loadXML($data, LIBXML_NONET);
+
+        libxml_use_internal_errors($internalErrors);
+        libxml_disable_entity_loader($disableEntities);
+
+        foreach ($dom->childNodes as $child) {
+            if ($child->nodeType === XML_DOCUMENT_TYPE_NODE) {
+                throw new UnexpectedValueException('Document types are not allowed.');
+            }
+        }
+
+        $xml = simplexml_import_dom($dom);
+
+        if ($error = libxml_get_last_error()) {
+            throw new UnexpectedValueException($error->message);
+        }
+
+        if (!$xml->count()) {
+            if (!$xml->attributes()) {
+                return (string) $xml;
+            }
+            $data = array();
+            foreach ($xml->attributes() as $attrkey => $attr) {
+                $data['@'.$attrkey] = (string) $attr;
+            }
+            $data['#'] = (string) $xml;
+
+            return $data;
+        }
+
+        return $this->parseXml($xml);
+    }
+
+    /**
+      * Checks whether the serializer can encode to given format
+      *
+      * @param string $format format name
+      * @return Boolean
+      */
+     public function supportsEncoding($format)
+     {
+         return 'xml' === $format;
+     }
+
+     /**
+      * Checks whether the serializer can decode from given format
+      *
+      * @param string $format format name
+      * @return Boolean
+      */
+     public function supportsDecoding($format)
+     {
+         return 'xml' === $format;
+     }
+
+    /**
+     * Sets the root node name
+     * @param string $name root node name
+     */
+    public function setRootNodeName($name)
+    {
+        $this->rootNodeName = $name;
+    }
+
+    /**
+     * Returns the root node name
+     * @return string
+     */
+    public function getRootNodeName()
+    {
+        return $this->rootNodeName;
+    }
+
+    /**
+     * @param DOMNode $node
+     * @param string  $val
+     *
+     * @return Boolean
+     */
+    final protected function appendXMLString($node, $val)
+    {
+        if (strlen($val) > 0) {
+            $frag = $this->dom->createDocumentFragment();
+            $frag->appendXML($val);
+            $node->appendChild($frag);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * @param DOMNode $node
+     * @param string  $val
+     *
+     * @return Boolean
+     */
+    final protected function appendText($node, $val)
+    {
+        $nodeText = $this->dom->createTextNode($val);
+        $node->appendChild($nodeText);
+
+        return true;
+    }
+
+    /**
+     * @param DOMNode $node
+     * @param string  $val
+     *
+     * @return Boolean
+     */
+    final protected function appendCData($node, $val)
+    {
+        $nodeText = $this->dom->createCDATASection($val);
+        $node->appendChild($nodeText);
+
+        return true;
+    }
+
+    /**
+     * @param DOMNode             $node
+     * @param DOMDocumentFragment $fragment
+     *
+     * @return Boolean
+     */
+    final protected function appendDocumentFragment($node, $fragment)
+    {
+        if ($fragment instanceof \DOMDocumentFragment) {
+            $node->appendChild($fragment);
+
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Checks the name is a valid xml element name
+     *
+     * @param string $name
+     *
+     * @return Boolean
+     */
+    final protected function isElementNameValid($name)
+    {
+        return $name &&
+            false === strpos($name, ' ') &&
+            preg_match('#^[\pL_][\pL0-9._-]*$#ui', $name);
+    }
+
+    /**
+     * Parse the input SimpleXmlElement into an array.
+     *
+     * @param SimpleXmlElement $node xml to parse
+     *
+     * @return array
+     */
+    private function parseXml($node)
+    {
+        $data = array();
+        if ($node->attributes()) {
+            foreach ($node->attributes() as $attrkey => $attr) {
+                $data['@'.$attrkey] = (string) $attr;
+            }
+        }
+        foreach ($node->children() as $key => $subnode) {
+            if ($subnode->count()) {
+                $value = $this->parseXml($subnode);
+            } elseif ($subnode->attributes()) {
+                $value = array();
+                foreach ($subnode->attributes() as $attrkey => $attr) {
+                    $value['@'.$attrkey] = (string) $attr;
+                }
+                $value['#'] = (string) $subnode;
+            } else {
+                $value = (string) $subnode;
+            }
+
+            if ($key === 'item') {
+                if (isset($value['@key'])) {
+                    $data[(string) $value['@key']] = $value['#'];
+                } else {
+                    $data['item'][] = $value;
+                }
+            } elseif (array_key_exists($key, $data)) {
+                if ((false === is_array($data[$key]))  || (false === isset($data[$key][0]))) {
+                    $data[$key] = array($data[$key]);
+                }
+                $data[$key][] = $value;
+            } else {
+                $data[$key] = $value;
+            }
+        }
+
+        return $data;
+    }
+
+    /**
+     * Parse the data and convert it to DOMElements
+     *
+     * @param DOMNode      $parentNode
+     * @param array|object $data       data
+     *
+     * @return Boolean
+     */
+    private function buildXml($parentNode, $data)
+    {
+        $append = true;
+
+        if (is_array($data) || $data instanceof \Traversable) {
+            foreach ($data as $key => $data) {
+                //Ah this is the magic @ attribute types.
+                if (0 === strpos($key, "@") && is_scalar($data) && $this->isElementNameValid($attributeName = substr($key, 1))) {
+                    $parentNode->setAttribute($attributeName, $data);
+                } elseif ($key === '#') {
+                    $append = $this->selectNodeType($parentNode, $data);
+                } elseif (is_array($data) && false === is_numeric($key)) {
+                    /**
+                     * Is this array fully numeric keys?
+                     */
+                    if (ctype_digit(implode('', array_keys($data)))) {
+                        /**
+                         * Create nodes to append to $parentNode based on the $key of this array
+                         * Produces <xml><item>0</item><item>1</item></xml>
+                         * From array("item" => array(0,1));
+                         */
+                        foreach ($data as $subData) {
+                            $append = $this->appendNode($parentNode, $subData, $key);
+                        }
+                    } else {
+                        $append = $this->appendNode($parentNode, $data, $key);
+                    }
+                } elseif (is_numeric($key) || !$this->isElementNameValid($key)) {
+                    $append = $this->appendNode($parentNode, $data, "item", $key);
+                } else {
+                    $append = $this->appendNode($parentNode, $data, $key);
+                }
+            }
+
+            return $append;
+        }
+        if (is_object($data)) {
+            $data = $this->serializer->normalize($data, $this->format);
+            if (null !== $data && !is_scalar($data)) {
+                return $this->buildXml($parentNode, $data);
+            }
+            // top level data object was normalized into a scalar
+            if (!$parentNode->parentNode->parentNode) {
+                $root = $parentNode->parentNode;
+                $root->removeChild($parentNode);
+
+                return $this->appendNode($root, $data, $this->rootNodeName);
+            }
+
+            return $this->appendNode($parentNode, $data, 'data');
+        }
+        throw new UnexpectedValueException('An unexpected value could not be serialized: '.var_export($data, true));
+    }
+
+    /**
+     * Selects the type of node to create and appends it to the parent.
+     *
+     * @param DOMNode      $parentNode
+     * @param array|object $data
+     * @param string       $nodeName
+     * @param string       $key
+     *
+     * @return Boolean
+     */
+    private function appendNode($parentNode, $data, $nodeName, $key = null)
+    {
+        $node = $this->dom->createElement($nodeName);
+        if (null !== $key) {
+            $node->setAttribute('key', $key);
+        }
+        $appendNode = $this->selectNodeType($node, $data);
+        // we may have decided not to append this node, either in error or if its $nodeName is not valid
+        if ($appendNode) {
+            $parentNode->appendChild($node);
+        }
+
+        return $appendNode;
+    }
+
+    /**
+     * Checks if a value contains any characters which would require CDATA wrapping.
+     *
+     * @param string $val
+     *
+     * @return Boolean
+     */
+    private function needsCdataWrapping($val)
+    {
+        return preg_match('/[<>&]/', $val);
+    }
+
+    /**
+     * Tests the value being passed and decide what sort of element to create
+     *
+     * @param DOMNode $node
+     * @param mixed   $val
+     *
+     * @return Boolean
+     */
+    private function selectNodeType($node, $val)
+    {
+        if (is_array($val)) {
+            return $this->buildXml($node, $val);
+        } elseif ($val instanceof \SimpleXMLElement) {
+            $child = $this->dom->importNode(dom_import_simplexml($val), true);
+            $node->appendChild($child);
+        } elseif ($val instanceof \Traversable) {
+            $this->buildXml($node, $val);
+        } elseif (is_object($val)) {
+            return $this->buildXml($node, $this->serializer->normalize($val, $this->format));
+        } elseif (is_numeric($val)) {
+            return $this->appendText($node, (string) $val);
+        } elseif (is_string($val) && $this->needsCdataWrapping($val)) {
+            return $this->appendCData($node, $val);
+        } elseif (is_string($val)) {
+            return $this->appendText($node, $val);
+        } elseif (is_bool($val)) {
+            return $this->appendText($node, (int) $val);
+        } elseif ($val instanceof \DOMNode) {
+            $child = $this->dom->importNode($val, true);
+            $node->appendChild($child);
+        }
+
+        return true;
+    }
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/Exception.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * Base exception
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+interface Exception
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/InvalidArgumentException.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * InvalidArgumentException
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/LogicException.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * LogicException
+ *
+ * @author Lukas Kahwe Smith <smith@pooteeweet.org>
+ */
+class LogicException extends \LogicException implements Exception
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/RuntimeException.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * RuntimeException
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class RuntimeException extends \RuntimeException implements Exception
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/UnexpectedValueException.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * UnexpectedValueException
+ *
+ * @author Lukas Kahwe Smith <smith@pooteeweet.org>
+ */
+class UnexpectedValueException extends \UnexpectedValueException implements Exception
+{
+}

core/vendor/symfony/serializer/Symfony/Component/Serializer/Exception/UnsupportedException.php

+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Serializer\Exception;
+
+/**
+ * UnsupportedException
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class UnsupportedException extends InvalidArgumentException
+{
+}