source: Dev/trunk/RGraph/scripts/minify @ 144

#!/usr/bin/php -q
<?php
    /**
    * This is a minification script. It minifies the desired script "in-place"
    * 
    *  Usage (Unix): ./minify file1 file2 ...
    *  Usage (Windows): C:\php\php.exe minify file1 file2 ...
    * 
    * The minification is medium, and it can over halve a scripts size.
    * Combined with subsequent gzip compression the results can be excellent. For
    * example a 70k script of mine was reduced to just 7k. (!) Substantial
    * bandwidth savings for you, and much improved performance for your users.
    *
    * NOTE: Usage on Windows works, but is less tested
    */

    /**
    * Check for arg
    */
    if (empty($_SERVER['argv'][1])) {
        echo "RGraph minification script\n";
        echo "==========================\n";
        echo "Usage (Unix):     " . $_SERVER['argv'][0] . " file1 file2 ...\n";
        echo "Usage (Windows): C:\php\php.exe " . $_SERVER['argv'][0] . " file1 file2 ...\n\n";
        exit;

    } else {

        for ($i=1; $i<count($_SERVER['argv']); ++$i) {
            Minify($_SERVER['argv'][$i]);
        }
    }


    /**
    * This is the function that does the work of minifying the file
    * 
    * @param $filename string The filename to be minified
    */
    function Minify($filename)
    {
        /**
        * Begin
        */
        $original = file_get_contents($filename);
        $new = preg_replace('/^ +/m', '', $original);    // Lose spaces at the start of lines
        $new = preg_replace('/ *\/\/.*$/m', '', $new);   // Lose comments of the style: "// ..."
        $new = preg_replace("/;\r?\n/m", ";\r\n", $new); // Make all lines end with \r\n
        //$new = preg_replace("|\r\n\*|", "", $new);
        
        /**
        * Get rid of block comments
        */
        $out = '';
        $inBlock = false; // Are we in a block comment
        for ($i=0; $i<strlen($new); $i++) {
            if (substr($new, $i, 1) == '/') {
                // Read the next char
                if (!$inBlock AND substr($new, $i, 2) == '/*') {
                    $inBlock = true;
                }
            } elseif (substr($new, $i, 2) == '*/') {
                $inBlock = false;
                $i++;
                continue;
            }
            
            if (!$inBlock) {
                $out .= substr($new, $i, 1);
            }
        }
        
        /**
        * Get rid of double line breaks
        * 
        * NOTE: Is this necessary?
        */
        $out = preg_replace('|\n+|', "\n", $out);
        
        /**
        * Further tweaks
        * UPDATED: 28th March 2009 - Line endings have been changed - they should all be \r\n
        */
        $out = str_replace(";\r\n}", ';}', $out);
        $out = str_replace(";\r\nRGraph", ';RGraph', $out);
        $out = preg_replace('/;\r\n([a-z])/i', ';$1', $out);
        $out = str_replace('if (', 'if(', $out);
        $out = str_replace(') {', '){', $out);
        $out = str_replace("}\r\n", '}', $out);
        $out = str_replace("{\r\n", '{', $out); // UPDATED
        $out = str_replace("{\r\n", '{', $out); // UPDATED
        $out = str_replace("}\r\n}", '}}', $out); // UPDATED
        $out = str_replace("}\r\n}", '}}', $out); // UPDATED
        $out = str_replace("}\r\n}", '}}', $out); // UPDATED
        $out = preg_replace('/ {2,}= /', ' = ', $out);
        
        // Mark the file as minified
        $out = "// THIS FILE HAS BEEN MINIFIED\r\n" . $out;
    
        file_put_contents($filename, $out);
        
        printf(" Minifying {$filename} Before: %s After: %s Saving: %d%%\n", number_format(strlen($original)), number_format(strlen($out)), number_format((((strlen($original) - strlen($out)) / strlen($original)) * 100), 1));
    }
?>