From c9d0e027faca3fef715fb382bd3d22701aa8391d Mon Sep 17 00:00:00 2001
From: Mike Gerwitz <mike@mikegerwitz.com>
Date: Tue, 28 Dec 2010 20:58:42 -0500
Subject: [PATCH] Added isClass() and isClassInstance() methods

---
 lib/class.js       | 37 +++++++++++++++++++++++++++++++++++++
 test/test-class.js | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/lib/class.js b/lib/class.js
index a307f13..d79c86b 100644
--- a/lib/class.js
+++ b/lib/class.js
@@ -39,6 +39,43 @@ exports.extend = function( base )
 }
 
 
+/**
+ * Determines whether the provided object is a class created through ease.js
+ *
+ * @param  {Object}  obj  object to test
+ *
+ * @return  {boolean}  true if class (created through ease.js), otherwise false
+ */
+exports.isClass = function( obj )
+{
+    obj = obj || {};
+
+    return ( obj.prototype instanceof Class )
+        ? true
+        : false
+    ;
+};
+
+
+/**
+ * Determines whether the provided object is an instance of a class created
+ * through ease.js
+ *
+ * @param  {Object}  obj  object to test
+ *
+ * @return  {boolean}  true if instance of class (created through ease.js),
+ *                     otherwise false
+ */
+exports.isClassInstance = function( obj )
+{
+    obj = obj || {};
+
+    return ( obj instanceof Class )
+        ? true
+        : false;
+};
+
+
 /**
  * Default class implementation
  *
diff --git a/test/test-class.js b/test/test-class.js
index 5435dcc..c7ec50a 100644
--- a/test/test-class.js
+++ b/test/test-class.js
@@ -44,6 +44,43 @@ assert.ok(
     "Extend method creates a new object"
 );
 
+assert.ok(
+    ( Class.isClass( Class.extend() ) ),
+    "Classes are considered by the system to be classes"
+);
+
+
+//
+// isClass
+assert.ok(
+    ( !( Class.isClass( {} ) ) ),
+    "Only actual classes are considered to be classes"
+);
+
+assert.ok(
+    ( !( Class.isClass( new Foo() ) ) ),
+    "Class instances are not considered to be classes (they are objects)"
+);
+
+
+//
+// isClassInstance
+assert.ok(
+    ( Class.isClassInstance( new Foo() ) ),
+    "Class instances are considered to be classes instances"
+);
+
+assert.ok(
+    ( !( Class.isClassInstance( Foo ) ) ),
+    "Classes are not considered to be class instances"
+);
+
+assert.ok(
+    ( !( Class.isClassInstance( {} ) ) ),
+    "Other objects are not considered to be class instances"
+);
+
+
 // only perform check if supported by the engine
 if ( Object.isFrozen )
 {