From 19dc4e5a31b32e86fa50082080c2499aa2008364 Mon Sep 17 00:00:00 2001
From: Krinkle <krinkle@users.mediawiki.org>
Date: Mon, 13 Dec 2010 23:52:45 +0000
Subject: [PATCH] added compareObject function to mediaWiki core jQuery
 prototyping utilities

---
 resources/mediawiki/mediawiki.js | 61 ++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/resources/mediawiki/mediawiki.js b/resources/mediawiki/mediawiki.js
index 0f3a10b27e..fc7aa10c8d 100644
--- a/resources/mediawiki/mediawiki.js
+++ b/resources/mediawiki/mediawiki.js
@@ -50,6 +50,67 @@ jQuery.extend({
 			}
 		}
 		return true;
+	},
+	compareObject : function( objectA, objectB ) {
+	
+		// Do a simple check if the types match
+		if ( typeof( objectA ) == typeof( objectB ) ) {
+	
+			// Only loop over the contents if it really is an object
+			if ( typeof( objectA ) == 'object' ) {
+				// If they are aliases of the same object (ie. mw and mediaWiki) return now
+				if ( objectA === objectB ) {
+					return true;
+				} else {
+					// Iterate over each property
+					for ( var prop in objectA ) {
+						// Check if this property is also present in the other object
+						if ( prop in objectB ) {
+							// Compare the types of the properties
+							var type = typeof( objectA[prop] );
+							if ( type == typeof( objectB[prop] ) ) {
+								// Recursively check objects inside this one
+								switch ( type ) {
+									case 'object' :
+										if ( !$.compareObject( objectA[prop], objectB[prop] ) ) {
+											return false;
+										}
+										break;
+									case 'function' :
+										// Functions need to be strings to compare them properly
+										if ( objectA[prop].toString() !== objectB[prop].toString() ) {
+											return false;
+										}
+										break;
+									default:
+										// Strings, numbers
+										if ( objectA[prop] !== objectB[prop] ) {
+											return false;
+										}
+										break;
+								}
+							} else {
+								return false;
+							}
+						} else {
+							return false;
+						}
+					}
+					// Check for properties in B but not in A
+					// This is about 15% faster (tested in Safari 5 and Firefox 3.6)
+					// ...than incrementing a count variable in the above and below loops
+					// See also: http://www.mediawiki.org/wiki/ResourceLoader/Default_modules/compareObject_test#Results
+					for ( var prop in objectB ) {
+						if ( !( prop in objectA ) ) {
+							return false;
+						}
+					}
+				}
+			}
+		} else {
+			return false;
+		}
+		return true;
 	}
 });
 
-- 
2.20.1