Throwing exception when the configuration cannot be parsed properly.

There the easy case when the parser actualy detect the error and we pass along
his exception and
there is the edge case when there is only one line of config that can be
interpreted as a string by the parser.

Author: mikeSimonson

src/Dflydev/DotAccessConfiguration/YamlConfigurationBuilder.php

@@ -11,6 +11,7 @@
 
 namespace Dflydev\DotAccessConfiguration;
 
+use Psr\Log\InvalidArgumentException;
 use Symfony\Component\Yaml\Yaml;
 
 class YamlConfigurationBuilder extends AbstractConfigurationBuilder
@@ -38,7 +39,16 @@ public function __construct($input = null)
     public function internalBuild(ConfigurationInterface $configuration)
     {
         if (null !== $this->input) {
-            $configuration->importRaw(Yaml::parse($this->input));
+            try{
+                $yml = Yaml::parse($this->input, true);
+            } catch (\Exception $e) {
+                throw new InvalidArgumentException($e->getMessage(), 0, $e);
+            }
+            if (is_string($yml))
+            {
+                throw(new \InvalidArgumentException('Yaml could not be parsed, parser detected a string.'));
+            }
+            $configuration->importRaw($yml);
         }
     }
 }