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