yuicompressor.php

<?php

class YUICompressor
{
    
    // absolute path to YUI jar file.
    private static $JAR_PATH;
    private static $TEMP_FILES_DIR;
    private $options = array('type' => 'js',
                             'linebreak' => false,
                             'verbose' => false,
                             'nomunge' => false,
                             'semi' => false,
                             'nooptimize' => false);
    private $files = array();
    private $string = '';
    
    // construct with a path to the YUI jar and a path to a place to put temporary files
    function __construct($JAR_PATH, $TEMP_FILES_DIR, $options = array())
    {
        $this->JAR_PATH = $JAR_PATH;
        $this->TEMP_FILES_DIR = $TEMP_FILES_DIR;
        
        foreach ($options as $option => $value)
        {
            $this->setOption($option, $value);
        }
    }
    
    // set one of the YUI compressor options
    function setOption($option, $value)
    {
        $this->options[$option] = $value;
    }

    // add a file (absolute path) to be compressed
    function addFile($file)
    {
        array_push($this->files, $file);
    }
    
    // add a strong to be compressed
    function addString($string)
    {
        $this->string .= ' ' . $string;
    }
    
    // the meat and potatoes, executes the compression command in shell
    function compress()
    {
        
        // read the input
        foreach ($this->files as $file) {
    		$this->string .= file_get_contents($file) or die("Cannot read from uploaded file");        
        }
    	
        // create single file from all input
        $input_hash = sha1($this->string);
        $file = $this->TEMP_FILES_DIR . '/' . $input_hash . '.txt';
        $fh = fopen($file, 'w') or die("Can't create new file");
        fwrite($fh, $this->string);
        fclose($fh);
    	
    	// start with basic command
        $cmd = "java -Xmx32m -jar " . escapeshellarg($this->JAR_PATH) . ' ' . escapeshellarg($file) . " --charset UTF-8";
    
        // set the file type
    	$cmd .= " --type " . (strtolower($this->options['type']) == "css" ? "css" : "js");
    	
    	// and add options as needed
    	if ($this->options['linebreak'] && intval($this->options['linebreak']) > 0) {
            $cmd .= ' --line-break ' . intval($this->options['linebreak']);
    	}

    	if ($this->options['verbose']) {
    	   $cmd .= " -v";
        }
            
		if ($this->options['nomunge']) {
			$cmd .= ' --nomunge';
		}
		
		if ($this->options['semi']) {
			$cmd .= ' --preserve-semi';
		}
		
		if ($this->options['nooptimize']) {
			$cmd .= ' --disable-optimizations';
		}
    
        // execute the command
    	exec($cmd . ' 2>&1', $raw_output);
    	
    	// add line breaks to show errors in an intelligible manner
        $flattened_output = implode("\n", $raw_output);
    	
    	// clean up (remove temp file)
    	unlink($file);
    	
    	// return compressed output
    	return $flattened_output;
    }
}

?>