From d7cc67e72a3f53629104d811986acd688f104cda Mon Sep 17 00:00:00 2001
From: Antonio Gallo <tonicucoz@gmail.com>
Date: Wed, 23 Feb 2011 21:12:47 +0000
Subject: improved diff algorithm

---
 h-source/Application/Include/myFunctions.php | 36 +++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 9 deletions(-)

(limited to 'h-source/Application/Include/myFunctions.php')

diff --git a/h-source/Application/Include/myFunctions.php b/h-source/Application/Include/myFunctions.php
index d0d51bf..9e05ed2 100644
--- a/h-source/Application/Include/myFunctions.php
+++ b/h-source/Application/Include/myFunctions.php
@@ -128,16 +128,33 @@ function getOrderByClause($string)
 	return $orderBy;
 }
 
+//remove empty elements
+function removeEmptyStrings($oArray)
+{
+	$nArray = array();
+	foreach ($oArray as $oValue)
+	{
+		if (strcmp($oValue,'') !== 0)
+		{
+			$nArray[] = $oValue;
+		}
+	}
+	return $nArray;
+}
 
-function diff($old, $new){
+function diff($old, $new)
+{
 	$maxlen = 0;
-	foreach($old as $oindex => $ovalue){
-// 				$nkeys = getNewKeys($new,$ovalue);
+	foreach($old as $oindex => $ovalue)
+	{
 			$nkeys = array_keys($new, $ovalue);
-			foreach($nkeys as $nindex){
+// 			echo memory_get_peak_usage(true)."<br />";
+			foreach($nkeys as $nindex)
+			{
 					$matrix[$oindex][$nindex] = isset($matrix[$oindex - 1][$nindex - 1]) ?
 							$matrix[$oindex - 1][$nindex - 1] + 1 : 1;
-					if($matrix[$oindex][$nindex] > $maxlen){
+					if($matrix[$oindex][$nindex] > $maxlen)
+					{
 							$maxlen = $matrix[$oindex][$nindex];
 							$omax = $oindex + 1 - $maxlen;
 							$nmax = $nindex + 1 - $maxlen;
@@ -151,13 +168,15 @@ function diff($old, $new){
 			diff(array_slice($old, $omax + $maxlen), array_slice($new, $nmax + $maxlen)));
 }
 
-function htmlDiff($old, $new){
+function htmlDiff($old, $new)
+{
 	$old = str_replace("\r\n"," \r\n ",$old);
 	$new = str_replace("\r\n"," \r\n ",$new);
 
 	$ret = null;
-	$diff = diff(explode(' ', $old), explode(' ', $new));
-	foreach($diff as $k){
+	$diff = diff(removeEmptyStrings(explode(' ', $old)),removeEmptyStrings(explode(' ', $new)));
+	foreach($diff as $k)
+	{
 			if(is_array($k))
 					$ret .= (!empty($k['d'])?"<del>".implode(' ',$k['d'])."</del> ":'').
 							(!empty($k['i'])?"<ins>".implode(' ',$k['i'])."</ins> ":'');
@@ -167,7 +186,6 @@ function htmlDiff($old, $new){
 }
 
 
-//a cosa serve?
 function applyBreaks($values,$fields)
 {
 	$fieldsArray = explode(',',$fields);
-- 
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