From 1065ea56092fe376c52a7625eb0d49bc333c5f21 Mon Sep 17 00:00:00 2001
From: GabrieleNunez <gabe@colossalventures.com>
Date: Wed, 5 Aug 2015 15:28:19 -0400
Subject: [PATCH] - Moved Regular Expresion generation into function
 generateCensorCheck and storing in variable $this->censorChecks;

- At the beginning of function censorString now doing a check to see if $this->censorChecks is generated. More performant in iteration heavy scenarios
---
 src/CensorWords.php | 102 ++++++++++++++++++++++++++------------------
 1 file changed, 60 insertions(+), 42 deletions(-)

diff --git a/src/CensorWords.php b/src/CensorWords.php
index 9d5f190..819aa99 100644
--- a/src/CensorWords.php
+++ b/src/CensorWords.php
@@ -4,6 +4,12 @@
 
 class CensorWords
 {
+	/*
+	* When the dictionary is loaded, a ton of regular expression strings are generated
+	* These regular expressions are used to perform the profanity checks. 
+	* Store them here so when we call censorString we don't need to regenerate them on every call
+	*/
+	private $censorChecks = null;
 	
 	public function __construct() {	
 		$this->replacer = '*';
@@ -45,7 +51,6 @@ public function setDictionary($dictionary) {
 			}
 		}	
 		$this->badwords = $badwords;
-			 
 	}
 	
 	
@@ -72,7 +77,55 @@ public function randCensor($chars, $len) {
 			substr($chars, 0, ($len%strlen($chars))));
 
 	}
+	
+	/**
+	* Generates the regular expressions that are going to be used to check for profanity
+	* @param		boolean			$fullWords		Option to generate regular expressions used for full words instead. Default is false
+	* void
+	*/
+	private function generateCensorChecks($fullWords = false) {
+	
+		$badwords = $this->badwords;
+		
+		// generate censor checks as soon as we load the dictionary
+		// utilize leet equivalents as well
+		$leet_replace = array();
+		$leet_replace['a']= '(a|a\.|a\-|4|@|Á|á|À|Â|à|Â|â|Ä|ä|Ã|ã|Å|å|α|Δ|Λ|λ)';
+		$leet_replace['b']= '(b|b\.|b\-|8|\|3|ß|Β|β)';
+		$leet_replace['c']= '(c|c\.|c\-|Ç|ç|¢|€|<|\(|{|©)';
+		$leet_replace['d']= '(d|d\.|d\-|&part;|\|\)|Þ|þ|Ð|ð)';
+		$leet_replace['e']= '(e|e\.|e\-|3|€|È|è|É|é|Ê|ê|∑)';
+		$leet_replace['f']= '(f|f\.|f\-|ƒ)';
+		$leet_replace['g']= '(g|g\.|g\-|6|9)';
+		$leet_replace['h']= '(h|h\.|h\-|Η)';
+		$leet_replace['i']= '(i|i\.|i\-|!|\||\]\[|]|1|∫|Ì|Í|Î|Ï|ì|í|î|ï)';
+		$leet_replace['j']= '(j|j\.|j\-)';
+		$leet_replace['k']= '(k|k\.|k\-|Κ|κ)';
+		$leet_replace['l']= '(l|1\.|l\-|!|\||\]\[|]|£|∫|Ì|Í|Î|Ï)';
+		$leet_replace['m']= '(m|m\.|m\-)';
+		$leet_replace['n']= '(n|n\.|n\-|η|Ν|Π)';
+		$leet_replace['o']= '(o|o\.|o\-|0|Ο|ο|Φ|¤|°|ø)';
+		$leet_replace['p']= '(p|p\.|p\-|ρ|Ρ|¶|þ)';
+		$leet_replace['q']= '(q|q\.|q\-)';
+		$leet_replace['r']= '(r|r\.|r\-|®)';
+		$leet_replace['s']= '(s|s\.|s\-|5|\$|§)';
+		$leet_replace['t']= '(t|t\.|t\-|Τ|τ)';
+		$leet_replace['u']= '(u|u\.|u\-|υ|µ)';
+		$leet_replace['v']= '(v|v\.|v\-|υ|ν)';
+		$leet_replace['w']= '(w|w\.|w\-|ω|ψ|Ψ)';
+		$leet_replace['x']= '(x|x\.|x\-|Χ|χ)';
+		$leet_replace['y']= '(y|y\.|y\-|¥|γ|ÿ|ý|Ÿ|Ý)';
+		$leet_replace['z']= '(z|z\.|z\-|Ζ)';
 
+		$censorChecks = array();
+		for ($x=0; $x<count($badwords); $x++) {
+			$censorChecks[$x] =  $fullWords ? '/\b'.str_ireplace(array_keys($leet_replace),array_values($leet_replace), $badwords[$x]).'\b/i' 
+											: '/'.str_ireplace(array_keys($leet_replace),array_values($leet_replace), $badwords[$x]).'/i';
+		}
+		
+		$this->censorChecks = $censorChecks;
+			
+	}
 
 	/**
 	 *  Apply censorship to $string, replacing $badwords with $censorChar.
@@ -81,53 +134,18 @@ public function randCensor($chars, $len) {
 	 *  string[string]
 	 */
 	public function censorString($string, $fullWords = false) {
-			$badwords = $this->badwords;
-			$anThis = &$this;
 			
-			$leet_replace = array();
-			$leet_replace['a']= '(a|a\.|a\-|4|@|Á|á|À|Â|à|Â|â|Ä|ä|Ã|ã|Å|å|α|Δ|Λ|λ)';
-			$leet_replace['b']= '(b|b\.|b\-|8|\|3|ß|Β|β)';
-			$leet_replace['c']= '(c|c\.|c\-|Ç|ç|¢|€|<|\(|{|©)';
-			$leet_replace['d']= '(d|d\.|d\-|&part;|\|\)|Þ|þ|Ð|ð)';
-			$leet_replace['e']= '(e|e\.|e\-|3|€|È|è|É|é|Ê|ê|∑)';
-			$leet_replace['f']= '(f|f\.|f\-|ƒ)';
-			$leet_replace['g']= '(g|g\.|g\-|6|9)';
-			$leet_replace['h']= '(h|h\.|h\-|Η)';
-			$leet_replace['i']= '(i|i\.|i\-|!|\||\]\[|]|1|∫|Ì|Í|Î|Ï|ì|í|î|ï)';
-			$leet_replace['j']= '(j|j\.|j\-)';
-			$leet_replace['k']= '(k|k\.|k\-|Κ|κ)';
-			$leet_replace['l']= '(l|1\.|l\-|!|\||\]\[|]|£|∫|Ì|Í|Î|Ï)';
-			$leet_replace['m']= '(m|m\.|m\-)';
-			$leet_replace['n']= '(n|n\.|n\-|η|Ν|Π)';
-			$leet_replace['o']= '(o|o\.|o\-|0|Ο|ο|Φ|¤|°|ø)';
-			$leet_replace['p']= '(p|p\.|p\-|ρ|Ρ|¶|þ)';
-			$leet_replace['q']= '(q|q\.|q\-)';
-			$leet_replace['r']= '(r|r\.|r\-|®)';
-			$leet_replace['s']= '(s|s\.|s\-|5|\$|§)';
-			$leet_replace['t']= '(t|t\.|t\-|Τ|τ)';
-			$leet_replace['u']= '(u|u\.|u\-|υ|µ)';
-			$leet_replace['v']= '(v|v\.|v\-|υ|ν)';
-			$leet_replace['w']= '(w|w\.|w\-|ω|ψ|Ψ)';
-			$leet_replace['x']= '(x|x\.|x\-|Χ|χ)';
-			$leet_replace['y']= '(y|y\.|y\-|¥|γ|ÿ|ý|Ÿ|Ý)';
-			$leet_replace['z']= '(z|z\.|z\-|Ζ)';
-
-			$words = explode(" ", $string);
-
-			for ($x=0; $x<count($badwords); $x++) {
-				if($fullWords) {
-					$badwords[$x] =  '/\b'.str_ireplace(array_keys($leet_replace),array_values($leet_replace), $badwords[$x]).'\b/i';
-				} else {
-					$badwords[$x] =  '/'.str_ireplace(array_keys($leet_replace),array_values($leet_replace), $badwords[$x]).'/i';
-				}
-			}
-
+			// generate our censor checks if they are not defined yet
+			if(!$this->censorChecks)
+				$this->generateCensorChecks($fullWords);
+			
+			$anThis = &$this;
 			$counter=0;
 			$match = array();
 			$newstring = array();
 			$newstring['orig'] = html_entity_decode($string);
 			// $anThis for <= PHP5.3
-			$newstring['clean'] =  preg_replace_callback($badwords, function($matches) use (&$anThis,&$counter,&$match) {
+			$newstring['clean'] =  preg_replace_callback($this->censorChecks, function($matches) use (&$anThis,&$counter,&$match) {
 				$match[$counter++] = $matches[0];
 
 				// is $anThis->replacer a single char?