From dbcd7fb1affe16cbf15a1b5f3fd5ca76ae7b1901 Mon Sep 17 00:00:00 2001
From: Mark Baker <mark@lange.demon.co.uk>
Date: Wed, 17 Nov 2010 18:04:55 +0000
Subject: [PATCH] Minor performance tweaks to the HTML Writer

git-svn-id: https://phpexcel.svn.codeplex.com/svn/trunk@63829 2327b42d-5241-43d6-9e2a-de5ac946f064
---
 Classes/PHPExcel/Writer/HTML.php | 30 ++++--------------------------
 1 file changed, 4 insertions(+), 26 deletions(-)

diff --git a/Classes/PHPExcel/Writer/HTML.php b/Classes/PHPExcel/Writer/HTML.php
index 63328477..cad3205d 100644
--- a/Classes/PHPExcel/Writer/HTML.php
+++ b/Classes/PHPExcel/Writer/HTML.php
@@ -986,7 +986,6 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 				}
 				$colSpan = 1;
 				$rowSpan = 1;
-				$writeCell = true;	// Write cell
 
 				// initialize
 				$cellData = '';
@@ -1042,11 +1041,12 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 						}
 					}
 
-					// replace leading spaces on each line with &nbsp;
-					$cellData = $this->_convertNbsp($cellData);
+					// Converts the cell content so that spaces occuring at beginning of each new line are replaced by &nbsp;
+					// Example: "  Hello\n to the world" is converted to "&nbsp;&nbsp;Hello\n&nbsp;to the world"
+					$cellData = preg_replace("/(?m)(?:^|\\G) /", '&nbsp;', $cellData);
 
 					// convert newline "\n" to '<br>'
-					$cellData = str_replace("\n", '<br/>', $cellData);
+					$cellData = nl2br($cellData);
 
 					// Extend CSS class?
 					if (!$this->_useInlineCss) {
@@ -1222,28 +1222,6 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 		return $this;
 	}
 
-	/**
-	 * Converts a string so that spaces occuring at beginning of each new line are replaced by &nbsp;
-	 * Example: "  Hello\n to the world" is converted to "&nbsp;&nbsp;Hello\n&nbsp;to the world"
-	 *
-	 * @param string $pValue
-	 * @return string
-	 */
-	private function _convertNbsp($pValue = '')
-	{
-		$explodes = explode("\n", $pValue);
-		foreach ($explodes as $explode) {
-			$matches = array();
-			if (preg_match('/^( )+/', $explode, $matches)) {
-				$explode = str_repeat('&nbsp;', strlen($matches[0])) . substr($explode, strlen($matches[0]));
-			}
-			$implodes[] = $explode;
-		}
-
-		$string = implode("\n", $implodes);
-		return $string;
-	}
-
 	/**
 	 * Add color to formatted string as inline style
 	 *