first commit

resources/xajax/xajax_core/xajaxCompress.inc.php

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+<?php
+
+/*
+	Function: xajaxCompressFile
+	
+	<xajax> will call this function internally to compress the javascript code for 
+	more efficient delivery.
+	
+	Parameters:
+	
+	$sFile - (stirng):  The file to be compressed.
+*/
+function xajaxCompressFile($sFile)
+{
+	//remove windows cariage returns
+	$sFile = str_replace("\r",'',$sFile);
+	
+	//array to store replaced literal strings
+	$literal_strings = array();
+	
+	//explode the string into lines
+	$lines = explode("\n",$sFile);
+	//loop through all the lines, building a new string at the same time as removing literal strings
+	$clean = '';
+	$inComment = false;
+	$literal = '';
+	$inQuote = false;
+	$escaped = false;
+	$quoteChar = '';
+	
+	$iLen = count($lines);
+	for($i=0; $i<$iLen; ++$i)
+	{
+		$line = $lines[$i];
+		$inNormalComment = false;
+	
+		//loop through line's characters and take out any literal strings, replace them with ___i___ where i is the index of this string
+		$jLen = strlen($line);
+		for($j=0; $j<$jLen; ++$j)
+		{
+			$c = substr($line,$j,1);
+			$d = substr($line,$j,2);
+	
+			//look for start of quote
+			if(!$inQuote && !$inComment)
+			{
+				//is this character a quote or a comment
+				if(($c=='"' || $c=="'") && !$inComment && !$inNormalComment)
+				{
+					$inQuote = true;
+					$inComment = false;
+					$escaped = false;
+					$quoteChar = $c;
+					$literal = $c;
+				}
+				else if($d=="/*" && !$inNormalComment)
+				{
+					$inQuote = false;
+					$inComment = true;
+					$escaped = false;
+					$quoteChar = $d;
+					$literal = $d;	
+					$j++;	
+				}
+				else if($d=="//") //ignore string markers that are found inside comments
+				{
+					$inNormalComment = true;
+				}
+				else
+				{
+					if (!$inNormalComment)
+						$clean .= $c;
+				}
+			}
+			else //allready in a string so find end quote
+			{
+				if($c == $quoteChar && !$escaped && !$inComment)
+				{
+					$inQuote = false;
+					$literal .= $c;
+	
+					//subsitute in a marker for the string
+					$clean .= "___" . count($literal_strings) . "___";
+	
+					//push the string onto our array
+					array_push($literal_strings,$literal);
+	
+				}
+				else if($inComment && $d=="*/")
+				{
+					$inComment = false;
+					$literal .= $d;
+					++$j;
+				}
+				else if($c == "\\" && !$escaped)
+					$escaped = true;
+				else
+					$escaped = false;
+	
+				$literal .= $c;
+			}
+		}
+		if($inComment) $literal .= "\n";
+		$clean .= "\n";
+	}
+	//explode the clean string into lines again
+	$lines = explode("\n",$clean);
+	
+	//now process each line at a time
+	$iLen = count($lines);
+	for($i=0; $i<$iLen; ++$i)
+	{
+		$line = $lines[$i];
+	
+		//remove comments
+		$line = preg_replace("/\/\/(.*)/","",$line);
+	
+		//strip leading and trailing whitespace
+		$line = trim($line);
+	
+		//remove all whitespace with a single space
+		$line = preg_replace("/\s+/"," ",$line);
+	
+		//remove any whitespace that occurs after/before an operator
+		$line = preg_replace("/\s*([!\}\{;,&=\|\-\+\*\/\)\(:])\s*/","\\1",$line);
+	
+		$lines[$i] = $line;
+	}
+	
+	//implode the lines
+	$sFile = implode("\n",$lines);
+	
+	//make sure there is a max of 1 \n after each line
+	$sFile = preg_replace("/[\n]+/","\n",$sFile);
+	
+	//strip out line breaks that immediately follow a semi-colon
+	$sFile = preg_replace("/;\n/",";",$sFile);
+	
+	//curly brackets aren't on their own
+	$sFile = preg_replace("/[\n]*\{[\n]*/","{",$sFile);
+	
+	//finally loop through and replace all the literal strings:
+	$iLen = count($literal_strings);
+	for($i=0; $i<$iLen; ++$i)
+		$sFile = str_replace('___'.$i.'___',$literal_strings[$i],$sFile);
+	
+	return $sFile;
+}