made some optimization when parsing YAML files

src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php

@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\Definition;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Yaml\Yaml;
+use Symfony\Component\Yaml\Parser as YamlParser;
 
 /**
  * YamlFileLoader loads YAML files service definitions.
@@ -29,6 +29,8 @@ use Symfony\Component\Yaml\Yaml;
  */
 class YamlFileLoader extends FileLoader
 {
+    private $yamlParser;
+
     /**
      * Loads a Yaml file.
      *
@@ -239,7 +241,19 @@ class YamlFileLoader extends FileLoader
      */
     protected function loadFile($file)
     {
-        return $this->validate(Yaml::parse($file), $file);
+        if (!stream_is_local($file)) {
+            throw new InvalidArgumentException(sprintf('This is not a local file "%s".', $file));
+        }
+
+        if (!file_exists($file)) {
+            throw new InvalidArgumentException(sprintf('The service file "%s" is not valid.', $file));
+        }
+
+        if (null === $this->yamlParser) {
+            $this->yamlParser = new YamlParser();
+        }
+
+        return $this->validate($this->yamlParser->parse(file_get_contents($file)), $file);
     }
 
     /**

src/Symfony/Component/Routing/Loader/YamlFileLoader.php

@@ -14,7 +14,7 @@ namespace Symfony\Component\Routing\Loader;
 use Symfony\Component\Routing\RouteCollection;
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Yaml\Yaml;
+use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Config\Loader\FileLoader;
 
 /**
@@ -30,6 +30,7 @@ class YamlFileLoader extends FileLoader
     private static $availableKeys = array(
         'resource', 'type', 'prefix', 'pattern', 'path', 'host', 'schemes', 'methods', 'defaults', 'requirements', 'options',
     );
+    private $yamlParser;
 
     /**
      * Loads a Yaml file.
@@ -47,7 +48,19 @@ class YamlFileLoader extends FileLoader
     {
         $path = $this->locator->locate($file);
 
-        $config = Yaml::parse($path);
+        if (!stream_is_local($path)) {
+            throw new \InvalidArgumentException(sprintf('This is not a local file "%s".', $path));
+        }
+
+        if (!file_exists($path)) {
+            throw new \InvalidArgumentException(sprintf('File "%s" not found.', $path));
+        }
+
+        if (null === $this->yamlParser) {
+            $this->yamlParser = new YamlParser();
+        }
+
+        $config = $this->yamlParser->parse(file_get_contents($path));
 
         $collection = new RouteCollection();
         $collection->addResource(new FileResource($path));

src/Symfony/Component/Translation/Loader/YamlFileLoader.php

@@ -14,7 +14,7 @@ namespace Symfony\Component\Translation\Loader;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Config\Resource\FileResource;
-use Symfony\Component\Yaml\Yaml;
+use Symfony\Component\Yaml\Parser as YamlParser;
 use Symfony\Component\Yaml\Exception\ParseException;
 
 /**
@@ -26,6 +26,8 @@ use Symfony\Component\Yaml\Exception\ParseException;
  */
 class YamlFileLoader extends ArrayLoader implements LoaderInterface
 {
+    private $yamlParser;
+
     /**
      * {@inheritdoc}
      *
@@ -41,8 +43,12 @@ class YamlFileLoader extends ArrayLoader implements LoaderInterface
             throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
         }
 
+        if (null === $this->yamlParser) {
+            $this->yamlParser = new YamlParser();
+        }
+
         try {
-            $messages = Yaml::parse($resource);
+            $messages = $this->yamlParser->parse(file_get_contents($resource));
         } catch (ParseException $e) {
             throw new InvalidResourceException('Error parsing YAML.', 0, $e);
         }

src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php

@@ -12,10 +12,12 @@
 namespace Symfony\Component\Validator\Mapping\Loader;
 
 use Symfony\Component\Validator\Mapping\ClassMetadata;
-use Symfony\Component\Yaml\Yaml;
+use Symfony\Component\Yaml\Parser as YamlParser;
 
 class YamlFileLoader extends FileLoader
 {
+    private $yamlParser;
+
     /**
      * An array of YAML class descriptions
      *
@@ -29,7 +31,19 @@ class YamlFileLoader extends FileLoader
     public function loadClassMetadata(ClassMetadata $metadata)
     {
         if (null === $this->classes) {
-            $this->classes = Yaml::parse($this->file);
+            if (!stream_is_local($this->file)) {
+                throw new \InvalidArgumentException(sprintf('This is not a local file "%s".', $this->file));
+            }
+
+            if (!file_exists($this->file)) {
+                throw new \InvalidArgumentException(sprintf('File "%s" not found.', $this->file));
+            }
+
+            if (null === $this->yamlParser) {
+                $this->yamlParser = new YamlParser();
+            }
+
+            $this->classes = $this->yamlParser->parse(file_get_contents($this->file));
 
             // empty file
             if (null === $this->classes) {