Merge pull request #3 from angryTom/composer-json

Added a composer json reader

src/Naneau/ProjectVersioner/Reader/ComposerJson.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * ComposerJson.php
+ *
+ * @package         ProjectVersioner
+ * @subpackage      Reader
+ */
+
+namespace Naneau\ProjectVersioner\Reader;
+
+use Naneau\ProjectVersioner\ReaderInterface;
+
+use \RuntimeException;
+use \stdClass;
+
+/**
+ * Finds the "version" from the composer.json file
+ *
+ * @category        Naneau
+ * @package         ProjectVersioner
+ * @subpackage      Reader
+ */
+class ComposerJson implements ReaderInterface
+{
+    /**
+     * {@inheritdoc}
+     **/
+    public function canRead($directory)
+    {
+        return is_readable($directory . '/composer.json');
+    }
+
+    /**
+     * {@inheritdoc}
+     **/
+    public function read($directory)
+    {
+        $json = @file_get_contents($directory . '/composer.json');
+        if ($json === false) {
+            return false;
+        }
+
+        $json = json_decode($json);
+        if (!($json instanceof stdClass) || empty($json->version)) {
+            return false;
+        } 
+
+        return trim($json->version);        
+    }
+}