<?php
/*
 * compress a javascript file by removing whitespace and optionally 
 * modifying variable and function names
 */


function compressJS( $szJSfile, $szCJSfile )
{
    if (file_exists($szJSfile)) {
        $szContents = file_get_contents($szJSfile);
        
        $aSearch = array('/\/\/.*/', // c++ style comments - //something
                         '/\/\*.*\*\//sU', // c style comments - /* something */
                         '/\s{2,}/s', //2 or more spaces down to one space
                         '/\n/', //newlines removed
                         '/\s*(=|;|\}|\{|\)|\(|\)|\+|\*|\-|\,|\/|>|<|:|\?|\|\||\&\&)\s*/',
                         '/\}(\w+)/',
                         '/\};(catch|finally|else)/',

                         );
        
        $aReplace = array( '',
                           '',
                           ' ',
                           '',
                           '\1',
                           '};\1',
                           '}\1',
                          );
                          
        //remove c++ comments
        $szContents = preg_replace( $aSearch, $aReplace, $szContents );
    
        $cjsF = "compressed/$szCJSfile";
        $fh = fopen($cjsF, "w");
        fwrite( $fh, $szContents);
        fclose($fh);
        
        $cratio = round(100 *(filesize($cjsF) / filesize($szJSfile)));
        echo "compress ratio $cratio %\n";
        
    } else {
        echo "File $szCJSfile not existing!";
    }   
}
 

//compressJS('zoombox.js', 'zoombox.cjs');


$fileList = scandir(".");
//print_r($fileList);
foreach ($fileList as $f) {
    
    if (substr($f, -3) == ".js") {
        echo "compressing $f\n";
        compressJS($f, $f);
    }

}


?>