[Translation] added the component

Loader/ArrayLoader.php

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+<?php
+
+namespace Symfony\Component\Translation\Loader;
+
+use Symfony\Component\Translation\MessageCatalogue;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * ArrayLoader loads translations from a PHP array.
+ *
+ * @author Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class ArrayLoader implements LoaderInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    function load($resource, $locale, $domain = 'messages')
+    {
+        $catalogue = new MessageCatalogue($locale);
+        $catalogue->addMessages($resource, $domain);
+
+        return $catalogue;
+    }
+}

Loader/LoaderInterface.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace Symfony\Component\Translation\Loader;
+
+use Symfony\Component\Translation\MessageCatalogue;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * LoaderInterface is the interface implemented by all translation loaders.
+ *
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+interface LoaderInterface
+{
+    /**
+     * Loads a locale.
+     *
+     * @param  mixed  $resource A resource
+     * @param  string $locale   A locale
+     * @param  string $domain   The domain
+     *
+     * @return MessageCatalogue A MessageCatalogue instance
+     */
+    function load($resource, $locale, $domain = 'messages');
+}

Loader/PhpFileLoader.php

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+<?php
+
+namespace Symfony\Component\Translation\Loader;
+
+use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Resource\FileResource;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * PhpFileLoader loads translations from PHP files returning an array of translations.
+ *
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class PhpFileLoader implements LoaderInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    function load($resource, $locale, $domain = 'messages')
+    {
+        $catalogue = new MessageCatalogue($locale);
+        $catalogue->addMessages(require($resource), $domain);
+        $catalogue->addResource(new FileResource($resource));
+
+        return $catalogue;
+    }
+}

Loader/XliffFileLoader.php

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+<?php
+
+namespace Symfony\Component\Translation\Loader;
+
+use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Resource\FileResource;
+
+/*
+ * This file is part of the Symfony framework.
+ *
+ * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
+ *
+ * This source file is subject to the MIT license that is bundled
+ * with this source code in the file LICENSE.
+ */
+
+/**
+ * XliffFileLoader loads translations from XLIFF files.
+ *
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class XliffFileLoader implements LoaderInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    function load($resource, $locale, $domain = 'messages')
+    {
+        $xml = $this->parseFile($resource);
+        $xml->registerXPathNamespace('xliff', 'urn:oasis:names:tc:xliff:document:1.2');
+
+        $catalogue = new MessageCatalogue($locale);
+        foreach ($xml->xpath('//xliff:trans-unit') as $translation) {
+            $catalogue->setMessage((string) $translation->source, (string) $translation->target, $domain);
+        }
+        $catalogue->addResource(new FileResource($resource));
+
+        return $catalogue;
+    }
+
+    /**
+     * Validates and parses the given file into a SimpleXMLElement
+     *
+     * @param  string $file
+     * @return SimpleXMLElement
+     */
+    protected function parseFile($file)
+    {
+        $dom = new \DOMDocument();
+        $current = libxml_use_internal_errors(true);
+        if (!@$dom->load($file, LIBXML_COMPACT)) {
+            throw new \Exception(implode("\n", $this->getXmlErrors()));
+        }
+
+        $parts = explode('/', str_replace('\\', '/', __DIR__).'/schema/dic/xliff-core/xml.xsd');
+        $drive = '\\' === DIRECTORY_SEPARATOR ? array_shift($parts).'/' : '';
+        $location = 'file:///'.$drive.implode('/', array_map('rawurlencode', $parts));
+
+        $source = file_get_contents(__DIR__.'/schema/dic/xliff-core/xliff-core-1.2-strict.xsd');
+        $source = str_replace('http://www.w3.org/2001/xml.xsd', $location, $source);
+
+        if (!@$dom->schemaValidateSource($source)) {
+            throw new \Exception(implode("\n", $this->getXmlErrors()));
+        }
+        $dom->validateOnParse = true;
+        $dom->normalizeDocument();
+        libxml_use_internal_errors($current);
+
+        return simplexml_import_dom($dom);
+    }
+
+    /**
+     * Returns the XML errors of the internal XML parser
+     *
+     * @return array  An array of errors
+     */
+    protected function getXmlErrors()
+    {
+        $errors = array();
+        foreach (libxml_get_errors() as $error) {
+            $errors[] = sprintf('[%s %s] %s (in %s - line %d, column %d)',
+                LIBXML_ERR_WARNING == $error->level ? 'WARNING' : 'ERROR',
+                $error->code,
+                trim($error->message),
+                $error->file ? $error->file : 'n/a',
+                $error->line,
+                $error->column
+            );
+        }
+
+        libxml_clear_errors();
+        libxml_use_internal_errors(false);
+
+        return $errors;
+    }
+}