<?php // xajaxCompressJavascript() compresses the javascript code for more efficient delivery // used internally // $sJS is a string containing the javascript code to compress function xajaxCompressJavascript($sJS) { //remove windows cariage returns $sJS = str_replace("\r","",$sJS); //array to store replaced literal strings $literal_strings = array(); //explode the string into lines $lines = explode("\n",$sJS); //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; $quoteChar = ""; for($i=0;$i<count($lines);$i++) { $line = $lines[$i]; $inNormalComment = false; //loop through line's characters and take out any literal strings, replace them with ___i___ where i is the index of this string for($j=0;$j<strlen($line);$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; $clean .= $c; } else { $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; //subsitute in a marker for the string $clean .= "___" . count($literal_strings) . "___"; //push the string onto our array array_push($literal_strings,$literal); $j++; } else if($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 for($i=0;$i<count($lines);$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 $sJS = implode("\n",$lines); //make sure there is a max of 1 \n after each line $sJS = preg_replace("/[\n]+/","\n",$sJS); //strip out line breaks that immediately follow a semi-colon $sJS = preg_replace("/;\n/",";",$sJS); //curly brackets aren't on their own $sJS = preg_replace("/[\n]*\{[\n]*/","{",$sJS); //finally loop through and replace all the literal strings: for($i=0;$i<count($literal_strings);$i++) $sJS = str_replace("___".$i."___",$literal_strings[$i],$sJS); return $sJS; } ?>