From 02b4117b70835dacc9ec564895bc2083f20b197d Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Tue, 9 Jan 2018 11:30:09 +0100
Subject: [PATCH] Parse smiley codes only once during the request lifetime

The parsed smilies are already semi-immutable during the request
lifetime and especially the ordering by lenght via `mb_strlen()` is an
expensive operation. Using a static runtime cache improves the
performance when rebuilding messages in bulk, reducing the time by up to
40%.

We should backport this to 3.0 once it has proven to be stable,
especially changing the `$smilies` property into a static variable can
break derived classes.
---
 .../node/HtmlInputNodeTextParser.class.php    | 70 ++++++++++---------
 1 file changed, 38 insertions(+), 32 deletions(-)

diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
index 8ea4f1024e..5554dbc427 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeTextParser.class.php
@@ -43,12 +43,6 @@ class HtmlInputNodeTextParser {
 	 */
 	protected $smileyCount = 0;
 	
-	/**
-	 * list of smilies by smiley code
-	 * @var Smiley[]
-	 */
-	protected $smilies = [];
-	
 	/**
 	 * @var string[]
 	 */
@@ -60,6 +54,12 @@ class HtmlInputNodeTextParser {
 	 */
 	protected static $illegalChars = '[^\x0-\x2C\x2E\x2F\x3A-\x40\x5B-\x60\x7B-\x7F]+';
 	
+	/**
+	 * list of smilies by smiley code
+	 * @var Smiley[]
+	 */
+	protected static $smilies;
+	
 	/**
 	 * regex for user mentions
 	 * @var string
@@ -91,34 +91,40 @@ class HtmlInputNodeTextParser {
 		if (MODULE_SMILEY) {
 			$this->smileyCount = $smileyCount;
 			
-			// get smilies
-			$smilies = SmileyCache::getInstance()->getSmilies();
-			$categories = SmileyCache::getInstance()->getCategories();
-			
-			foreach ($smilies as $categoryID => $categorySmilies) {
-				if (!array_key_exists($categoryID ?: null, $categories) || $categories[$categoryID ?: null]->isDisabled) continue;
+			if (self::$smilies === null) {
+				self::$smilies = [];
 				
-				/** @var Smiley $smiley */
-				foreach ($categorySmilies as $smiley) {
-					foreach ($smiley->smileyCodes as $smileyCode) {
-						$this->smilies[$smileyCode] = $smiley;
-					}
-				}
-			}
-			
-			uksort($this->smilies, function($a, $b) {
-				$lengthA = mb_strlen($a);
-				$lengthB = mb_strlen($b);
+				// get smilies
+				$smilies = SmileyCache::getInstance()->getSmilies();
+				$categories = SmileyCache::getInstance()->getCategories();
 				
-				if ($lengthA < $lengthB) {
-					return 1;
-				}
-				else if ($lengthA === $lengthB) {
-					return 0;
+				foreach ($smilies as $categoryID => $categorySmilies) {
+					if (!array_key_exists($categoryID ?: null, $categories) || $categories[$categoryID ?: null]->isDisabled) continue;
+					
+					/** @var Smiley $smiley */
+					foreach ($categorySmilies as $smiley) {
+						foreach ($smiley->smileyCodes as $smileyCode) {
+							self::$smilies[$smileyCode] = $smiley;
+						}
+					}
 				}
 				
-				return -1;
-			});
+				uksort(self::$smilies, function ($a, $b) {
+					$lengthA = mb_strlen($a);
+					$lengthB = mb_strlen($b);
+					
+					if ($lengthA < $lengthB) {
+						return 1;
+					}
+					else {
+						if ($lengthA === $lengthB) {
+							return 0;
+						}
+					}
+					
+					return -1;
+				});
+			}
 		}
 	}
 	
@@ -457,7 +463,7 @@ class HtmlInputNodeTextParser {
 				'difficult' => []
 			];
 			
-			foreach ($this->smilies as $smileyCode => $smiley) {
+			foreach (self::$smilies as $smileyCode => $smiley) {
 				$smileyCode = preg_quote($smileyCode, '~');
 				
 				if (preg_match('~^\\\:.+\\\:$~', $smileyCode)) {
@@ -544,7 +550,7 @@ class HtmlInputNodeTextParser {
 				}
 				
 				$this->smileyCount++;
-				$smiley = $this->smilies[$smileyCode];
+				$smiley = self::$smilies[$smileyCode];
 				$element = $text->ownerDocument->createElement('img');
 				$element->setAttribute('src', $smiley->getURL());
 				$element->setAttribute('class', 'smiley');
-- 
2.20.1