From 6368ee0c6a2c6ff1c8a5d00d369ed3369dd067d8 Mon Sep 17 00:00:00 2001
From: Andrew Ozz <azaozz@git.wordpress.org>
Date: Sun, 3 May 2015 19:07:31 +0000
Subject: [PATCH] Emoji: before parsing added nodes test if the text in them
 contains emoji chars. That speeds up the processing quite a bit. See #32125.

git-svn-id: https://develop.svn.wordpress.org/trunk@32335 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/js/wp-emoji.js | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/wp-includes/js/wp-emoji.js b/src/wp-includes/js/wp-emoji.js
index f41907865e..eed3fe389e 100644
--- a/src/wp-includes/js/wp-emoji.js
+++ b/src/wp-includes/js/wp-emoji.js
@@ -70,7 +70,7 @@
 								node = node.parentNode;
 							}
 
-							if ( node && node.nodeType === 1 ) {
+							if ( node && node.nodeType === 1 && test( node.textContent ) ) {
 								parse( node );
 							}
 						}
@@ -84,6 +84,22 @@
 			parse( document.body );
 		}
 
+		/**
+		 * Test if a text string contains emoji characters
+		 *
+		 * @since 4.3.0
+		 *
+		 * @param {String} text The string to test
+		 * @returns Boolean
+		 */
+		function test( text ) {
+			if ( text && twemoji ) {
+				return twemoji.test( text );
+			}
+
+			return false;
+		}
+
 		/**
 		 * Given an element or string, parse any emoji characters into Twemoji images.
 		 *
@@ -144,7 +160,8 @@
 
 		return {
 			replaceEmoji: replaceEmoji,
-			parse: parse
+			parse: parse,
+			test: test
 		};
 	}