Merge pull request #4 from cfrutos/master

Adding has() method

.travis.yml

 language: php
 
 php:
-  - 5.3.3
   - 5.3
   - 5.4
   - 5.5

README.md

@@ -33,6 +33,12 @@ $data->get('a.b.d');
 
 // array('E0', 'E1', 'E2')
 $data->get('a.b.e');
+
+// true
+$data->has('a.b.c');
+
+// false
+$data->has('a.b.d.j');
 ```
 
 A more concrete example:
@@ -92,6 +98,9 @@ $data->set('hosts.april', array(
     'password' => '@---S',
     'roles' => array('web'),
 ));
+
+// Check if a key exists (true to this case)
+$hasKey = $data->has('hosts.dewey.username');
 ```
 
 

composer.json

@@ -15,6 +15,11 @@
             "name": "Beau Simensen",
             "email": "beau@dflydev.com",
             "homepage": "http://beausimensen.com"
+        },
+        {
+            "name": "Carlos Frutos",
+            "email": "carlos@kiwing.it",
+            "homepage": "https://github.com/cfrutos"
         }
     ],
     "require": {

src/Dflydev/DotAccessData/Data.php

@@ -159,6 +159,28 @@ class Data implements DataInterface
         return $currentValue === null ? $default : $currentValue;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function has($key)
+    {
+        $currentValue = &$this->data;
+        $keyPath = explode('.', $key);
+
+        for ( $i = 0; $i < count($keyPath); $i++ ) {
+            $currentKey = $keyPath[$i];
+            if (
+                !is_array($currentValue) ||
+                !isset($currentValue[$currentKey])
+            ) {
+                return false;
+            }
+            $currentValue = &$currentValue[$currentKey];
+        }
+
+        return true;
+    }
+
     /**
      * {@inheritdoc}
      */

src/Dflydev/DotAccessData/DataInterface.php

@@ -46,6 +46,15 @@ interface DataInterface
      */
     public function get($key, $default = null);
 
+    /**
+     * Check if the key exists
+     *
+     * @param string $key
+     *
+     * @return bool
+     */
+    public function has($key);
+
     /**
      * Get a data instance for a key
      *

tests/Dflydev/DotAccessData/DataTest.php

@@ -146,6 +146,23 @@ class DataTest extends \PHPUnit_Framework_TestCase
         $this->runSampleDataTests($data);
     }
 
+    public function testHas()
+    {
+        $data = new Data($this->getSampleData());
+
+        foreach (
+            array('a', 'i', 'b.d', 'f.g.h', 'h.i', 'b.d.d1') as $existentKey
+        ) {
+            $this->assertTrue($data->has($existentKey));
+        }
+
+        foreach (
+            array('p', 'b.b1', 'b.c.C1', 'h.i.I', 'b.d.d1.D1') as $notExistentKey
+        ) {
+            $this->assertFalse($data->has($notExistentKey));
+        }
+    }
+
     public function testGetData()
     {
         $wrappedData = new Data(array(